JP2014040903A - Replacement method of existent pipe - Google Patents

Abstract

To replace an existing pipe such as a sewer pipe, which has become uneven or meandering due to an earthquake or the like, while correcting the unevenness without excavating the land.
More than the length of a set of pipes constituting an existing pipe 100 in a crushing head 1 provided with a crushing blade for crushing an existing pipe 100 buried in the ground by sequentially joining a plurality of pipes. The leading steel pipe 3 having a length of 1 mm is connected, and the crushing head 1 is inserted into the existing pipe 100 from the starting shaft S1, while the crushing head 1 is pulled from the reaching shaft S2 via the pulling wire 5, and the crushing head 1 is pulled. The rehabilitating pipe 4 made of synthetic resin is connected to the leading steel pipe 3 in order. As a result, the crushing head 1 crushes the existing pipe 100 and pushes the crushing pieces around to form a space corresponding to the existing pipe 100, and introduces the leading steel pipe 3 and the renovated pipe 4 in this order. At this time, if the existing pipe 100 has unevenness or the like, the leading steel pipe 3 having a length corresponding to the length of a set of tubular bodies corrects the unevenness or the like together with the crushing head 1.
[Selection] Figure 14

Description

  The present invention relates to an existing pipe replacement method for replacing an existing pipe buried in the ground with a rehabilitation pipe without excavating the ground.

  Conventionally, it has been proposed to rehabilitate existing pipes such as aging sewer pipes, water pipes, agricultural water pipes, and gas pipes. For example, as shown in Patent Document 1, a pipe dividing and expanding device called a mall is inserted into an existing pipe, and the existing pipe is crushed by forcibly moving the existing pipe along the existing pipe. It is known that the rehabilitating pipe connected to the pipe dividing and expanding device is sequentially introduced into a space formed by crushing the existing pipe and replacing the existing pipe with the rehabilitating pipe while being pushed away to the surroundings.

JP-T-2001-508161

  By the way, in an area liquefied due to an earthquake or the like, damage such as unevenness or meandering occurs due to the floating or sinking of an existing pipe in the ground. In this case, the restoration of the current state by the open-cut method is the principle, but it is often difficult to restore the current state by excavation depending on the environment, such as under a national road with a lot of traffic, or under a track or under a river.

  In such a case, it is conceivable to apply a method for replacing the existing pipe with a rehabilitation pipe. However, this method is intended to rehabilitate existing pipes, and cannot be used if the existing pipes are uneven or meandering. In other words, when unevenness or meandering occurs due to an earthquake or the like, the above-described construction method leaves unevenness in the rehabilitated pipe replaced with the existing pipe. Therefore, for example, in the case of a sewer pipe, it is piped so as to naturally flow down from the upstream side toward the downstream side, but it is impossible to avoid the occurrence of a flow-down failure due to non-landing in the rehabilitation pipe replaced with the existing pipe, It cannot function as a sewer pipe.

  The present invention has been made in view of such problems, and rehabilitating pipes such as sewer pipes, etc. that have become uneven or meandering due to an earthquake, etc., while correcting the unevenness without excavating the land. It is intended to provide a method for replacing an existing pipe that can be replaced with the above.

  According to the present invention, a plurality of pipe bodies are joined in order and a traction wire is inserted from an arrival shaft to a start shaft in an existing tube buried in the ground, and a crush blade provided with a crushing blade for crushing the existing tube in the start shaft The pulling wire is connected to the head, the crushing head is inserted into the existing pipe, and the leading steel pipe that is longer than the length of a set of pipes constituting the existing pipe is connected to the crushing head to connect the pulling wire. While pulling, follow the movement of the crushing head by pulling the pulling wire, connect the rehabilitation pipe made of synthetic resin to the leading steel pipe in order, crush the existing pipe by moving the crushing head and push the shredded pieces around The leading steel pipe and the rehabilitated pipe are introduced in this order into the space formed by crushing the existing pipe.

  According to the present invention, the towing wire is inserted into the existing pipe from the reaching shaft to the starting shaft, and at the starting shaft, the towing wire is connected to the crushing head, and the crushing head is inserted into the existing pipe, and further led to the crushing head. The steel pipe is connected and the pulling wire is pulled from the reaching shaft. When the crushing head moves toward the reaching shaft by pulling the pulling wire, the regenerated pipe made of synthetic resin is connected to the leading steel pipe in order in accordance with the movement of the crushing head. On the other hand, when the crushing head moves, the existing pipe is crushed by the crushing blade, and the crushed pieces of the crushed existing pipe are pushed away along the crushing head. Then, after the leading steel pipe is introduced into the space formed by the crushing head crushing the existing pipe, the rehabilitated pipe connected to the leading steel pipe is introduced.

  Here, since the pulling wire is pulled by connecting the shaft center of the existing pipe in the start shaft and the shaft center of the existing pipe in the reaching shaft, the pulling wire passes through the shortest distance in the existing pipe laid between the shafts. . Therefore, the crushing head connected to the pulling wire crushes the existing pipe along the shortest distance by the pulling wire, and moves the crushing piece away. In addition, the lead steel pipe connected to the crushing head also moves along the shortest distance by the pulling wire in the space where the crushing head is pushed away. At this time, since the leading steel pipe has a length equal to or longer than the length of the set of pipe bodies constituting the existing pipe, the joint portion of one set or a plurality of sets of pipe bodies constituting the existing pipe is temporarily separated, Even if there is one or more unevenness in the existing pipe, the leading steel pipe is pulled along the shortest distance by the pulling wire across each set of pipes that have generated unevenness. Therefore, it moves to correct the unevenness. And the rehabilitation pipe is introduced into the space where the unevenness is corrected by the leading steel pipe.

  As a result, one or more irregularities or meandering occurred due to the segregation of the joints between the pipes constituting the existing pipe in the existing pipe such as a sewer pipe due to the earthquake and the liquefaction phenomenon accompanying the earthquake. However, it is possible to replace existing pipes with rehabilitation pipes while correcting unevenness without excavating the land.

  In the present invention, it is preferable that the leading steel pipe is formed by sequentially connecting a tip leading steel pipe, one or a plurality of intermediate leading steel pipes and a terminal leading steel pipe, or by connecting a tip leading steel pipe and a terminal leading steel pipe. . Thereby, since the length per one lead steel pipe can be shortened, the opening area including the length of the vertical shaft excavated based on road conditions etc. can be suppressed to the minimum.

  In the present invention, it is preferable that a plurality of reinforcing ribs extending in the tube axis direction are provided on the outer peripheral surface of the leading steel tube at intervals in the circumferential direction. As a result, when the leading steel pipe moves following the crushing head in the space formed by crushing the existing pipe by the crushing head and pushing the shredded pieces around, the buckling due to earth pressure and friction force acting on the leading steel pipe The load can be supported.

  In the present invention, it is preferable that an adapter having a diameter larger than the outer diameter of the existing pipe is connected to the crushing head, and a leading steel pipe is connected to the adapter. As a result, the preceding crushing head crushes the existing pipe, and the adapter can further expand the space corresponding to the existing pipe formed by pushing the crushing piece away to the surroundings. The earth pressure and frictional force acting on the leading steel pipe can be reduced.

  In the present invention, when the attachment pipe is connected to the existing pipe, the attachment pipe is separated from the existing pipe prior to replacing the existing pipe with the renovation pipe, and the replacement pipe is replaced with the renovation pipe. It is preferable that a connection port is formed at a connection portion with the mounting pipe in and the pipe end portion of the detached mounting pipe and the connection port of the rehabilitation pipe are connected via a repair member. Thereby, when crushing an existing pipe | tube via a crushing head, it can prevent that an attachment pipe is dragged by the existing pipe | tube and a connection port moves. In addition, the rehabilitation pipe and the pipe end of the attachment pipe can be repaired, and the use of the attachment pipe is not affected by ensuring the water tightness of the connection portion.

  In the present invention, a leading traction pipe is connected to an inner side of a rear end portion of the leading steel pipe, and a plurality of traction pipes are sequentially connected to the distal end traction pipe, while a rear pushing jig is connected to the rear end of the final rehabilitation pipe. It is preferable to be fixed to the final traction pipe in a state where it hits the part. As a result, when the leading steel pipe connected to the crushing head moves through the space corresponding to the existing pipe formed by pulling the crushing head, a plurality of towing pipes are connected to the leading steel pipe via the leading traction pipe. Since the rear pushing jig fixed to the traction pipe is abutted against the final retreading pipe, the retreading pipe connected to the leading steel pipe is composed of a leading traction pipe integrated with the leading steel pipe, a plurality of traction pipes and It is pushed out toward the reaching shaft through the rear pushing jig. Therefore, the traction force of the crushing head can be applied to the rehabilitated pipe as a driving force in the axial direction, so that bending tensile stress does not act on the connecting part of the rehabilitated pipe, and the rehabilitated pipe is prevented from dropping off. can do.

  ADVANTAGE OF THE INVENTION According to this invention, existing pipes, such as a sewer pipe | tube etc. which the non-landing and meandering generate | occur | produced by the earthquake etc., can be substituted by a renovation pipe | tube, correcting non-landing etc., without excavating land.

It is sectional drawing of an underground pipe line explaining one Embodiment of the replacement method of the existing pipe | tube of this invention. It is a perspective view which shows the crushing head and adapter used for the replacement method of the existing pipe | tube of FIG. 1 with a front-end | tip leading steel pipe. It is a perspective view which shows the leading steel pipe used for the replacement | exchange method of the existing pipe | tube of FIG. It is a perspective view which shows the rehabilitation pipe | tube used for the replacement method of the existing pipe | tube of FIG. 1 with a termination | terminus leading steel pipe. It is a perspective view which shows the reaction force collection | recovery apparatus used for the replacement method of the existing pipe | tube of FIG. It is the sectional view on the AA line of the reaction force collection | recovery apparatus of FIG. It is sectional drawing and B section enlarged view of an underground pipe line explaining the replacement method of the existing pipe | tube of this invention. FIG. 8 is a cross-sectional view of an underground conduit and an enlarged view of part C for explaining a method of replacing an existing pipe following FIG. 7. FIG. 9 is a cross-sectional view of the underground conduit explaining the replacement method of the existing pipe following FIG. 8. It is sectional drawing and the D section enlarged view of an underground pipe line explaining the replacement method of the existing pipe following FIG. It is sectional drawing and the E section enlarged view of an underground pipe line explaining the replacement method of the existing pipe following FIG. FIG. 12 is a cross-sectional view of an underground conduit and an enlarged view of an F portion for explaining a method for replacing an existing pipe following FIG. 11. FIG. 13 is a cross-sectional view of an underground pipe and an enlarged view of a G section for explaining a method of replacing an existing pipe following FIG. 12. It is sectional drawing of the underground pipe line explaining other embodiment of the replacement method of the existing pipe | tube of this invention. It is a perspective view which shows the crushing head and adapter used for the replacement method of the existing pipe | tube of FIG. 14 with a front-end | tip leading steel pipe. It is a perspective view which shows the leading steel pipe used for the replacement method of the existing pipe | tube of FIG. It is a perspective view which shows the rehabilitation pipe | tube used for the replacement method of the existing pipe | tube of FIG. 14 with a termination | terminus leading steel pipe and a traction pipe | tube. FIG. 15 is a cross-sectional view showing a rear pushing jig used in the existing pipe replacement method of FIG. 14 fixed to a rehabilitation pipe through a traction pipe. It is explanatory drawing which shows the process of pushing out a rehabilitation pipe | tube via a traction pipe | tube and a rear part pushing jig | tool. It is explanatory drawing which shows the extraction process using the pulling jig | tool of a leading steel pipe in a reaching shaft.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 schematically shows an embodiment of a method for replacing an existing pipe according to the present invention.

  The existing pipe replacement method excavates the start shaft S1 and the reaching shaft S2 at the start and end of the existing pipe 100 to be rehabilitated, and crushes the existing tube 100 embedded from the start shaft S1 to the reaching shaft S2. The rehabilitation pipe 4 having the same nominal diameter as that of the existing pipe 100 is laid in the space formed by pushing away the crushed pieces of the existing pipe 100 that have been crushed.

  Here, the existing pipe 100 is formed by sequentially joining pipes having a reference length. For example, an existing pipe formed by sequentially joining a vinyl chloride pipe having a length of 4000 mm and an existing pipe formed by sequentially joining a fume pipe having a length of 2000 mm can be given.

  In order to carry out this replacement method, a crushing head 1 for crushing the existing pipe 100, a leading steel pipe 3 connected to the crushing head 1 via an adapter 2, and a plurality of rehabilitation pipes 4 connected to the leading steel pipe 3 A wire pulling device 6 that pulls the crushing head 1, the adapter 2, the lead steel pipe 3 and the plurality of rehabilitated tubes 4 through the pulling wire 5, and a reaction force recovery device 7 that supports the wire pulling device 6 are used. The

  As shown in FIG. 2, the crushing head 1 has two crushing blades 13 axially separated by 180 degrees from the outer peripheral surface of a substantially hollow frustoconical base 12 formed in a tapered surface from the front end to the vicinity of the rear end. The crushing head main body 11 which is fixed, the traction shaft 14, and the traction head 15 which can be screw-coupled with the tip of the traction shaft 14 are inserted into the traction shaft 14. The traction head 15 is screwed to the distal end of the pulverization head 15, and the crushing head body 11 is fixed between the traction shaft 14 and the traction head 15. And since the base | substrate 12 of the crushing head 1 connects with the front connection part 21 of the adapter 2 mentioned later, the several connection hole 11a (female screw) is formed in the rear-end part at intervals in the circumferential direction. Further, the base 12 of the crushing head 1 has a front end side outer diameter set to be smaller than the inner diameter of the existing pipe 100, and a rear end side outer diameter set to be equal to or greater than the outer diameter of the existing pipe 100. Further, the crushing blade 13 is formed in a triangular shape having a blade 13a on the oblique side, and is disposed in a groove formed in the base body 12 along the axial direction. In this case, the blade 13a of the crushing blade 13 is formed in a taper shape so as to gradually increase from the outer peripheral surface of the base body 12 toward the rear from a height substantially coincident with the outer diameter on the front end side of the base body 12, and its rear end portion. Is set to a height that exceeds the outer diameter of the existing pipe 100.

  Note that an end clamp 51 of the pulling wire 5 is connected to the pulling head 15 via a pin.

  The adapter 2 has an outer peripheral surface corresponding to the inner peripheral surface of the rear end portion of the base body 12 in the crushing head 1, and a plurality of circumferentially spaced intervals corresponding to the connection holes 11 a formed in the rear end portion. The front connecting part 21 in which the connecting hole 21a is formed, the rear connecting part 23 in which a plurality of connecting holes 23a (female screws) are formed at intervals in the circumferential direction in order to connect to the leading steel pipe 3 to be described later, The connecting portion 21 and the rear connecting portion 23 are connected to each other, and an intermediate portion 22 formed on a tapered surface widening toward the rear connecting portion 23 from the front connecting portion 21. The outer diameter of the rear connecting portion 23 is the existing pipe. The outer diameter is larger than 100.

  Thereby, the adapter 2 is inserted into the crushing head 1 by fitting the front connecting portion 21 of the adapter 2 into the inner peripheral surface of the rear end portion of the base body 12 of the crushing head 1 and screwing the bolts together with the connecting holes 11a and 21a. Can be linked. At this time, the rear end edge on the outer peripheral surface side of the base 12 of the crushing head 1 is set to coincide with the front end edge on the outer peripheral surface side of the tapered surface in the intermediate portion 22 of the adapter 2. That is, when the adapter 2 is connected to the crushing head 1, the taper surface of the intermediate portion 22 of the adapter 2 is continuous with the rear end edge of the base 12 of the crushing head 1 with a larger gradient than the gradient of the base 12.

  The leading steel pipe 3 is mainly composed of an outer diameter pipe main body 31 corresponding to the inner diameter of the rear connecting portion 23 of the adapter 2 and short cylindrical receptacles 32 and 33 welded to the outer peripheral surface of the rear end portion of the pipe main body 31. A front end leading steel pipe 3A, one or a plurality of intermediate leading steel pipes 3B and an end leading steel pipe 3C are prepared corresponding to the shafts S1 and S2.

  The leading-end leading steel pipe 3 </ b> A includes a pipe body 31 having a set length and a receiving port 32 welded to a rear end outer peripheral surface of the pipe main body 31 so as to protrude a set length from a rear end edge thereof. A plurality of reinforcing ribs (round bars) 311 extending in the axial direction excluding the front end are welded at set intervals in the circumferential direction. A plurality of connection holes 31a are formed at the front end portion of the pipe main body 31 of the tip leading steel pipe 3A at intervals in the circumferential direction corresponding to the connection holes 23a formed in the rear connection portion 23 of the adapter 2. In addition, a plurality of connecting holes 32a are formed at the rear end of the receiving port 32 at intervals in the circumferential direction.

  The intermediate leading steel pipe 3B includes a pipe body 31 having a set length and a receiving port 32 welded so as to project a set length from the rear end edge of the pipe body 31 at the rear end portion thereof. A plurality of reinforcing ribs (round bars) 311 extending in the axial direction except for the front end portion are welded at a set interval in the circumferential direction, and the inner diameter of the front end portion of the pipe body 31 is A short cylindrical reinforcing ring 312 having an outer diameter corresponding to is welded. And the front end part of the pipe main body 31 of the intermediate leading steel pipe 3B and the reinforcing ring 312 are connected to a plurality of connecting parts at intervals in the circumferential direction corresponding to the connecting holes 32a formed in the receiving port 32 of the leading end leading steel pipe 3A. A hole 31b is formed, and a plurality of connecting holes 32a are formed at the rear end portion of the receiving port 32 at intervals in the circumferential direction.

  The end leading steel pipe 3C includes a pipe body 31 having a set length and a receiving port 33 which is welded to the outer peripheral surface of the rear end portion of the pipe main body 31 so as to protrude the set length from the rear end edge. A plurality of reinforcing ribs (round bars) 311 extending in the axial direction except for the front end portion are welded at a set interval in the circumferential direction, and the inner diameter of the front end portion of the pipe body 31 is A short cylindrical reinforcing ring 312 (see intermediate leading steel pipe 3B) corresponding to the outer diameter is welded. And the front end part of the pipe main body 31 of the terminal leading steel pipe 3C and the reinforcing ring 312 are connected to a plurality of connecting parts spaced in the circumferential direction corresponding to the connecting holes 32a formed in the receiving port 32 of the intermediate leading steel pipe 3B. A hole 31b is formed, and a plurality of connecting holes 33a are formed at the rear end portion of the receiving port 33 at intervals in the circumferential direction so as to be connected to the rehabilitation pipe 4 (described later) through bolts.

  Thereby, the front end portion of the pipe main body 31 of the tip leading steel pipe 3A is fitted and inserted into the inner peripheral surface of the rear connection portion 23 of the adapter 2, the bolts are inserted by fitting the connection holes 23a and 31a, and the nut is screwed. The tip leading steel pipe 3 </ b> A can be connected to the adapter 2.

  Further, the front end portion of the pipe body 31 of the foremost intermediate leading steel pipe 3B is fitted into the inner peripheral surface of the receiving port 32 of the leading end leading steel pipe 3A, the bolts are inserted by fitting the connecting holes 31b and 32a, and the nut is screwed. Thus, the foremost intermediate leading steel pipe 3B can be connected to the leading end leading steel pipe 3A. Similarly, the front end portion of the pipe body 31 of the subsequent intermediate leading steel pipe 3B is fitted into the inner peripheral surface of the receiving port 32 of the preceding intermediate leading steel pipe 3B, the bolts are inserted by aligning the connecting holes 31b and 32a, and the nut. Can be connected to the intermediate leading steel pipe 3B following the preceding intermediate leading steel pipe 3B. Further, the front end portion of the pipe main body 31 of the terminal leading steel pipe 3C is fitted and inserted into the inner peripheral surface of the receiving port 32 of the final intermediate leading steel pipe 3B, the bolts are inserted by fitting the connecting holes 31b and 32a, and the nut is screwed. Thus, the terminal leading steel pipe 3C can be connected to the final intermediate leading steel pipe 3B.

  A pair of stays 313 are arranged symmetrically with respect to the axial center on the inner peripheral surface of the reinforcing ring 312 of the intermediate leading steel pipe 3B and the inner peripheral surface of the reinforcing ring 312 of the terminal leading steel pipe 3C, which will be described later. Thus, the stay 313 can be pulled out by engaging the traction tool.

  In this embodiment, the leading steel pipe 3 has a tip leading steel pipe 3A and a plurality of intermediate leading steel pipes in order to keep the start shaft S1 and the reaching shaft S2 to a minimum opening area of 2.5 m in length and 1.5 m in width. 3B and the end leading steel pipe 3C are connected in order, and a tube having a reference length constituting the existing pipe 100, specifically, a length of 4000 mm or more corresponding to a vinyl chloride pipe having a length of 4000 mm (nominal diameter 250 mm). In the case where there is no restriction for excavating the shafts S1 and S2, it is one leading steel pipe 3 having a length equal to or longer than the reference length of the pipe constituting the existing pipe 100. It doesn't matter. For example, when the existing pipe is formed by sequentially joining the fume pipes having a length of 2000 mm, it can be constructed with one lead steel pipe 3 having a length of 2000 mm or more. In this case, a connecting hole 31a for the adapter 2 may be formed at the front end of the pipe body 31 of the lead steel pipe 3, and a receiving port 33 for the rehabilitated pipe 4 may be welded to the rear end. Similarly, two leading steel pipes 3 (the tip leading steel pipe 3A and the terminal leading steel pipe 3C) may be connected to form 2000 mm or more.

  Therefore, when the pipe body constituting the existing pipe 100 is broken and the existing pipe 100 has unevenness or meandering, the leading steel pipe 3 can be disposed across the tubular body in which the unevenness or the like has occurred. .

  The rehabilitation pipe 4 is a synthetic resin pipe body 41 having an outer diameter corresponding to the inner diameter of the receiving port 33 of the end leading steel pipe 3C described above, and includes a tip rehabilitation pipe 4A, one or a plurality of intermediate rehabilitation pipes 4B, and a terminal rehabilitation pipe. A tube 4C is prepared. Specifically, the tip rehabilitation tube 4A has a female thread 41b formed on the inner peripheral surface of the rear end portion of the tube body 41 having a set length, and the intermediate rehabilitation tube 4B is formed on the outer surface of the front end portion of the tube body 41 having a set length. The male screw 41a is formed with a female screw 41b on the inner peripheral surface of the rear end portion, and the terminal rehabilitation pipe 4C is formed by forming the male screw 41a on the outer peripheral surface of the front end portion of the tube body 41 having a set length.

  As a result, the front end portion of the tip renovated pipe 4A is fitted and inserted along the inner peripheral surface of the receiving port 33 of the terminal leading steel pipe 3C, and the connecting hole ( 4A can be connected to the end leading steel pipe 3C by forming a female thread) and screwing a bolt through the connecting hole. Further, the male screw 41a formed at the front end portion of the intermediate rehabilitation tube 4B is screwed into the female screw 41b formed at the rear end portion of the tip rehabilitation tube 4A or the female screw 41b formed at the rear end portion of the preceding intermediate rehabilitation tube 4B. Thus, the intermediate rehabilitation pipe 4B can be screwed to the tip rehabilitation pipe 4A, or the intermediate rehabilitation pipe 4B following the preceding intermediate rehabilitation pipe 4B can be screwed. Further, by screwing the male screw 41a formed at the front end portion of the terminal rehabilitation tube 4C into the female screw 41b formed at the rear end portion of the final intermediate rehabilitation tube 4B, the terminal rehabilitation tube 4C is screwed into the final intermediate rehabilitation tube 4B. Can be combined.

  In this embodiment, a hard vinyl chloride spiral propulsion pipe is used as the rehabilitation pipe 4, but the present invention is not limited to such an example. For example, an impact resistant hard vinyl chloride pipe or a heat resistant hard vinyl chloride pipe may be screwed. Can also be used.

  In addition, as described above, the rehabilitation pipe 4 having a length of 1000 mm was used from the relationship of the opening area of the start shaft S1, but when there is no restriction when excavating the start shaft S1, the rehabilitation having a length of 2000 mm is used. The tube 4 can also be used, and the length is not limited.

  The wire pulling device 6 is a commercial product, and is connected to a pair of hydraulic cylinders 61, a grip device (not shown) capable of gripping the pulling wire 5 and a reaction force recovery device 7 to be described later, and is rotatably supported. Pulley 62. When the hydraulic cylinder 61 is extended, the grip device grips the pulling wire 5 that winds the pulley 62 and moves upward, thereby pulling and pulling the pulling wire 5. On the other hand, when the hydraulic cylinder 61 is reduced, the grip device releases the pulling wire 5 and moves downward, thereby maintaining the pulling wire 5 in a stationary state. The pulling wire 5 can be pulled intermittently.

  The pulling wire 5 drawn out by the wire pulling device 6 is wound around a wire drum 52 arranged on the ground near the reaching shaft S2. Further, a hydraulic unit (not shown) for supplying pressure oil to the hydraulic cylinder 61 is installed on the ground near the reaching shaft S2.

  As shown in FIGS. 5 and 6, the reaction force recovery device 7 has a rectangular front support plate 71 in which a keyhole-shaped opening 71a is formed from the lower end edge to the middle part, and a long groove-shaped opening 72a in the middle from the lower end edge. The opposing corners of the square rear support plate 72 formed over the portion are connected via four tubular connecting members 73, and a keyhole-shaped opening 74a is spaced from the front support plate 71 at a set interval. Is connected to the front support plate 71 via bolts so that the center of the opening 74a coincides with the center of the opening 71a of the front support plate 71. It is configured. And the reaction force collection | recovery apparatus 7 is installed in the reaching shaft S2 via the mount 75 (refer FIG. 1) so that the center of the opening 71a of the front support plate 71 may correspond with the axial center of the existing pipe 100. FIG. At that time, the pipe end portion of the existing pipe 100 protruding from the wall surface of the reach shaft S2 is passed through the opening 71a of the front support plate 71, and the reaction force plate 74 is abutted against the pipe end face of the existing pipe 100 to support the front. It connects with the board 71 via a volt | bolt.

  Note that a stepped portion 74x corresponding to the outer diameter of the existing tube 100 is formed at the peripheral portion of the opening 74a of the reaction force plate 74, and the tube end surface of the existing tube 100 projects into the stepped portion 74x of the reaction force plate 74. It is applied and supported.

  Further, the length of the connecting member 73 of the reaction force recovery device 7 and the interval between the left and right connecting members 73 are set based on the diameter and length of the leading steel pipe 3, and, as will be described later, in the reaching shaft S2. The reached leading steel pipe 3 can be pulled up through a pair of upper connecting members 73 and 73 in the reaction force recovery device 7.

  Next, a construction procedure for replacing the existing pipe 100 in which unevenness has occurred using a plurality of rehabilitating pipes 4 using the equipment configured as described above will be described.

  In FIG. 1, the air hammer 16 is fixed to the pulling shaft 14 of the crushing head 1, and the crushing head 1 is pulled while the vibration by the air hammer 16 is applied to the existing pipe 100 via the crushing head 1 as necessary. The case where the existing pipe | tube 100 is crushed is shown. For this reason, the adapter 2 and the leading steel pipe 3 are sequentially passed through the air pipe 161 for supplying the compressed air to the air hammer 16, the adapter 2 is connected to the crushing head 1, the leading steel pipe 3 is connected to the adapter 2, and then the rehabilitation is performed. Although the structure which connects the pipe | tube 4 to the leading steel pipe 3 and the preceding rehabilitation pipe | tube through the air piping 161 in order is shown, the air hammer 16 and the air piping 161 are abbreviate | omitted in the following construction procedures.

  First, a shaft is excavated at the start and end of the construction section of the existing pipe 100 to be rehabilitated. Here, the upstream shaft of the existing pipe 100 is defined as a start shaft S1, and the downstream side is defined as a reaching shaft S2. And in each shaft S1, S2, while cutting the existing pipe | tube 100 in the state protruded from the wall surface by the set length, the cut existing pipe (tube body) is removed.

  Next, when the attachment pipe 200 is connected to the existing pipe 100, when the crushing head 1 is moved, from the existing pipe 100, the attachment pipe 200 is dragged to the existing pipe 100 so that the connection port does not move forward. The mounting tube 200 is cut off. Specifically, after conveying the TV camera 30 and the drilling machine 40 from the excavated start shaft S1 (arrival shaft S2), while confirming the connection port 100a between the existing pipe 100 and the mounting pipe 200 with the TV camera 30, The cutter blade 401 of the hole drilling machine 40 is raised while rotating to cut the periphery of the connection port 100a. That is, the edge part of the attachment pipe 200 connected to the existing pipe 100 is cut out over a set length and separated from the existing pipe 100 (see FIG. 7).

  If the mounting pipe 200 is separated from the existing pipe 100, the pulling wire 5 is inserted into the existing pipe 100 from the reaching vertical shaft S2 to the starting vertical shaft S1 via a wire not shown, and the crushing head 1 is carried into the starting vertical shaft S1. Then, the end clamp 51 provided at the tip of the pulling wire 5 is connected to the pulling head 15 of the crushing head 1 through a pin.

  Next, the reaction force recovery device 7 is carried into the reaching shaft S2 and is dropped and installed through the opening 71a of the front support plate 71 at the pipe end portion of the existing pipe 100 protruding from the wall surface of the reaching shaft S2. In other words, the center of the opening 71a of the front support plate 71 and the center of the opening 72a of the rear support plate 72 are aligned with the axial center of the existing pipe 100 via the gantry 75. Further, the reaction force plate 74 is abutted against the tube end surface of the existing tube 100 and connected to the front support plate 71 via a bolt, and then the wire pulling device 6 is connected to the rear support plate 72 of the reaction force recovery device 7. The pulling wire 5 is fitted into the grip mechanism of the wire pulling device 6.

  On the other hand, in the start shaft S1, the traction head 15 side of the crushing head 1 is inserted into the pipe end of the existing pipe 100 protruding from the wall surface. And after connecting the adapter 2 to the crushing head 1, it connects to the adapter 2 in order of the leading steel pipe 3 (the tip leading steel pipe 3A, the set number of intermediate leading steel pipes 3B, and the terminal leading steel pipe 3C).

  Next, when the hydraulic cylinder 61 of the wire pulling device 6 is extended, the pulling wire 5 is gripped and pulled up via the grip device. Thereby, the pulling wire 5 is pulled to the reaching shaft S2 side through the existing pipe 100, and further, the center of the opening 71a of the front support plate 71, the center of the opening 74a of the reaction force plate 74, and the rear in the reaction force recovery device 7. The pulley 62 is wound around the center of the opening 72a of the support plate 72 and taken up. The pulled pulling wire 5 is wound around the wire drum 52 in order. When the hydraulic cylinder 61 reaches the stroke end, the hydraulic cylinder 61 is contracted and the gripping of the pulling wire 5 by the grip device is released. Hereinafter, the pulling wire 5 is intermittently pulled toward the reaching shaft S2 by the expansion and contraction operation of the hydraulic cylinder 61. That is, the pulling wire 5 is pulled along the shortest distance in the existing pipe 100 that connects the axis of the existing pipe 100 in the start shaft S1 and the axis of the existing pipe 100 in the reaching shaft S2.

  By the pulling of the pulling wire 5, the crushing head 1 connected to the pulling wire 5 is forcibly moved toward the reaching shaft S <b> 2. When the crushing head 1 moves, the crushing blade 13 cuts and crushes the existing pipe 100 and pushes the crushing pieces along the substrate 12 to the periphery. Therefore, the space where the existing pipe 100 is crushed and pushed away by the crushing head 1 is formed along the shortest distance connecting the axis of the existing pipe 100 in the start shaft S1 and the axis of the existing pipe 100 in the reaching shaft S2. The

  Thereafter, the adapter 2 connected to the crushing head 1 moves, and the crushing pieces of the existing pipe 100 crushed by the crushing head 1 are further pushed outward. That is, the crushing head 1 crushes the existing pipe 100 and pushes away the crushing pieces to the periphery to form a space substantially corresponding to the existing pipe 100, and then the crushing pieces of the existing pipe 100 crushed by the adapter 2 are further removed. A space larger than the space substantially corresponding to the existing pipe 100 is formed by pushing away, and the leading steel pipe 3 (the tip leading steel pipe 3A, the intermediate leading steel pipe 3B...) Is introduced into the space formed by the adapter 2.

  At this time, the pulling force in the axial direction by the pulling wire 5 is supported by the reaction force recovery device 7 on the peripheral wall of the reaching shaft S2. Further, the bending moment due to the traction force generated when the pulling wire 5 winds the pulley 62 of the wire pulling device 6 causes the pipe end surface of the existing tube 100 to fit into the stepped portion 74x of the reaction force plate 74 of the reaction force recovery device 7. By being combined, it acts as a bending moment acting on the existing pipe 100 and can be supported by the rigidity of the existing pipe 100.

  The pulling force of the pulling wire 5 acts so as to press the reaction force recovery device 7 against the peripheral wall of the reaching shaft S2, so that the stepped portion 74x of the reaction force plate 74 does not come off from the tube end of the existing pipe 100. .

  Further, a buckling load due to earth pressure or friction force acting on the leading steel pipe 3 is supported by the reinforcing rib 311 and the reinforcing ring 312.

  Hereinafter, if the crushing head 1 moves toward the reaching shaft S2, the set number of intermediate leading steel pipes 3B... Are connected in order so as to supplement the moved length, and the existing pipe 100 is crushed. Introduce into the space where the piece was pushed away. Then, the end leading steel pipe 3C is connected to the final intermediate leading steel pipe 3B to form the leading steel pipe 3 that is longer than the length of the pipe constituting the existing pipe 100. As a result, the leading steel pipe 3 having a length equal to or longer than the length of the tubular body constituting the existing pipe 100 is formed by connecting the leading end leading steel pipe 3A, the set number of intermediate leading steel pipes 3B, and the terminating leading steel pipe 3C to the adapter 2. Move.

  By the way, even if one or a plurality of pipes constituting the existing pipe break due to an earthquake and a liquefaction phenomenon accompanying the earthquake, etc., even if one or a plurality of unevenness occurs in the existing pipe 100 The leading steel pipe 3 having a length equal to or longer than the length of the pipe constituting the existing pipe 100 is pulled across the pipes in which the unevenness and the like are generated together with the crushing head 1 and the adapter 2 that are integrally connected. By moving along the shortest distance by the wire 5, each unevenness etc. can be corrected in order (refer FIG. 9).

  Specifically, before and after construction, the depth (pipe bottom height) of the existing pipe 100 and the rehabilitation pipe 4 is measured at intervals of 1 m using a beacon at a set interval from the ground surface by a locator, and the difference between the maximum value and the minimum value. Was calculated to be 189 mm for the existing pipe 100 at first, but it was 50 mm or less for the rehabilitation pipe 4 after the update, and taking into account the measurement errors of the locator and beacon, it was shown that the unevenness was corrected. ing.

  In addition, since the crushed piece of the existing pipe 100 is pushed away to the surroundings, the influence on the ground was considered, but the change in the ground height before and after the construction is ± 5 mm at the maximum, and is considered to be within the error range.

  Further, if the crushing head 1 moves toward the reaching shaft S2, the rehabilitation pipe 4 (the tip rehabilitation pipe 4A, the intermediate rehabilitation pipe 4B,...) Is sequentially connected to the leading steel pipe 3 (the terminal leading steel pipe 3C). 3 is connected so as to supplement the distance traveled.

  When the rehabilitating tube 4 is screwed, in order to prevent unknown water from entering from the screwed portion, a bonding agent that swells by reacting with water and exhibits a sealing effect is applied to the male screw 41a.

  Hereinafter, by pulling the pulling wire 5 through the wire pulling device 6 and sequentially connecting the intermediate rehabilitation pipe 4B in accordance with the movement of the crushing head 1, the existing pipe 100 is crushed and the crushed pieces are moved to the surroundings. While pushing away, it repeats introducing the rehabilitation pipe | tube 4 in order into the space which corrected the unevenness of the existing pipe | tube 100 etc. (refer FIG. 9).

  If the crushing head 1 reaches the reaching shaft S2, the crushing head 1 is pulled to the vicinity of the rear support plate 72 of the reaction force recovery device 7, and then the connection between the adapter 2 and the tip leading steel pipe 3A is released, and the tip leading steel pipe The connection between 3A and the first intermediate leading steel pipe 3B is released, and the crushing head 1 and the tip leading steel pipe 3A are collected on the ground. Next, although not shown in detail, the T-shaped traction tool is engaged with the two stays 313 of the earliest intermediate leading steel pipe 3B, and the reach shaft with the intermediate leading steel pipe 3B of the next stage using a winch or the like. Pull out to S2. Thereafter, the connection between the first intermediate leading steel pipe 3B and the next intermediate leading steel pipe 3B is released, and the connection between the second intermediate leading steel pipe 3B and the subsequent intermediate leading steel pipe 3B is released, and the first intermediate leading steel pipe 3B is released. The steel pipe 3B and the next intermediate lead steel pipe 3B are collected on the ground.

  Similarly, after the T-shaped traction tool is engaged with the two stays 313 of the preceding intermediate leading steel pipe 3B and pulled out to the reaching shaft S2 together with the subsequent intermediate leading steel pipe 3B using a winch or the like, The intermediate leading steel pipe 3B and the succeeding intermediate leading steel pipe 3B are released, and the subsequent intermediate leading steel pipe 3B and the subsequent intermediate leading steel pipe 3B are released, and the two intermediate leading steel pipes 3B drawn out are removed. Is repeatedly collected on the ground to collect all intermediate leading steel pipes 3B. Finally, if the end leading steel pipe 3C is pulled out and collected, the front end portion of the tip renovated pipe 4A connected to the end leading steel pipe 3C is pulled out to the reaching shaft S2 (see FIG. 10).

  If the front end portion of the tip rehabilitation pipe 4A protrudes into the reaching shaft S2, the wire pulling device 6 and the reaction force recovery device 7 are recovered on the ground.

  Next, the rehabilitation pipe 4 and the attachment pipe 200 are connected. Specifically, as shown in FIG. 10, a pilot hole for lowering the hole drilling machine 50 from the ground using a hook or the like of the attachment pipe 200 and forming a connection port 4 a with the attachment pipe 200 in the rehabilitation pipe 4. 4x (see FIG. 11B) is formed. Next, the TV camera 30 and the hole drilling machine 40 are transported from the start shaft S1 (the arrival shaft S2), and the pilot hole 4x formed in the rehabilitation pipe 4 is confirmed by the TV camera 30, while the cutter blade 402 of the hole drilling machine 40 is used. Is rotated while being rotated, and the peripheral edge of the pilot hole 4x is cut to form a connection port 4a (see FIG. 12B) with the attachment pipe 200 (see FIG. 11).

  If the connection port 4a with the attachment pipe 200 is formed in the rehabilitation pipe 4, the repair packer 60 is reduced in diameter, and a cheese-like repair member 70 made of vinyl chloride resin, which is the same material as the rehabilitation pipe 4, is formed on the outer peripheral surface thereof. Is carried into the rehabilitation pipe 4 and conveyed to the connection port 4a (see FIG. 12). Next, while confirming with the TV camera 30, heated air is supplied to the repair packer 60 to expand the diameter, and the neck portion protrudes into the attachment tube 200 through the connection port 4 a, and the neck portion of the repair member 70 is attached to the attachment tube 200. In addition, the body portion of the repair member 70 is brought into close contact with the inner peripheral surface of the renovated pipe 4. At this time, the repair member 70 is softened and melted by being heated by the heated air, and is adhered to the inner peripheral surface of the lower end portion of the attachment tube 200 and the inner peripheral surface of the rehabilitation tube 4 in the vicinity of the connection port 4a. (See FIG. 13).

  Thereby, prior to the rehabilitation work of the existing pipe 100, the lower end portion of the attachment pipe 200 disconnected from the existing pipe 100 is repaired and connected by the repair member 70 through the rehabilitation pipe 4 and its connection port 4a. And if the rehabilitation pipe | tube 4 and the attachment pipe | tube 200 are connected via the repair member 70, after supplying the cooling air instead of heating air and hardening the repair member 70, supply of air will be stopped. The diameter of the repair packer 60 may be reduced and pulled out to the shaft side through the rehabilitation pipe 4.

  Here, if the unevenness of the existing pipe 100 is convex downward, the interval between the rehabilitation pipe 4 that has corrected the unevenness and the pipe end of the mounting pipe 200 that has been cut off approaches, so that the repair member 70 is There is no problem in using both to connect. On the other hand, if the unevenness of the existing pipe 100 is convex upward, the interval between the rehabilitated pipe 4 whose unevenness has been corrected and the pipe end of the attachment pipe 200 will be increased. Therefore, when the interval between the rehabilitation pipe 4 and the pipe end of the attachment pipe 200 is equal to or higher than the set height, the repair using only the repair member 70 is impossible.

  In this case, although not shown in detail, a conventionally known attachment pipe rehabilitation method may be used in combination. That is, a lining pipe made of a thermoplastic resin such as vinyl chloride, which has a smaller diameter than the inner diameter of the mounting pipe 200 and recovers the shape of the circular pipe at the shape memory temperature, is inserted into the mounting pipe 200, and the lining pipe is heated. Pressurize and expand the diameter, restore the shape of a circular pipe and make it closely contact the inner peripheral surface of the mounting pipe 200, then cut the end of the lining pipe protruding into the rehabilitation pipe 4, and connect the rehabilitation pipe 4 to the connection port What is necessary is just to connect between 4a periphery using the repair member 70. FIG.

  On the other hand, when the distance between the rehabilitation pipe 4 and the pipe end of the attachment pipe 200 is equal to or lower than the set height, use a saddle-like tube-port saddle in addition to the cheese-like repair member 70 as a repair member. You can also.

  As described above, according to the present invention, even if there is unevenness in the existing pipe 100, it can be laid by replacing it with the rehabilitation pipe 4 while correcting the unevenness. Even if it is difficult to restore the current state of the sewer pipe or the like that has been generated by the open-cut method, it can be quickly restored to a usable state.

  Moreover, even if the attachment pipe 200 is connected to the existing pipe 100, it can be easily connected to the rehabilitation pipe 4 that is laid in place of the existing pipe 100 and can be quickly restored to a usable state.

  By the way, in embodiment mentioned above, although the construction procedure in case the attachment pipe | tube 200 was connected to the existing pipe 100 was demonstrated, when the attachment pipe | tube 200 is not connected to the existing pipe 100, work with respect to the attachment pipe | tube 200 is demonstrated. Obviously, the construction can be omitted without needing to explain.

  Moreover, in embodiment mentioned above, the case where the leading steel pipe 3 is introduced by pushing the crushed piece of the existing pipe 100 crushed by the crushing head 1 outward through the adapter 2 having a diameter larger than the pipe diameter of the existing pipe 100 However, the leading steel pipe 3 (the tip leading steel pipe 3A) may be directly connected to the crushing head 1 without using the adapter 2 depending on the soil or the like. In this case, the rear end portion of the base 12 of the crushing head 1 may be designed to correspond to the leading steel pipe 3.

  Incidentally, FIG. 14 schematically shows another embodiment of the method for replacing an existing pipe according to the present invention.

  Similarly to the above-described embodiment, the existing pipe replacement method was also performed by excavating the start shaft S1 and the reaching shaft S2 at the start end and the end of the existing pipe 100 to be rehabilitated and burying from the start shaft S1 to the reaching shaft S2. The existing pipe 100 is crushed, and the rehabilitation pipe 4 having the same nominal diameter as that of the existing pipe 100 is introduced and laid in a space formed by pushing the crushed pieces of the crushed existing pipe 100 around. However, the attachment pipe 200 is not connected to the existing pipe 100.

  In order to carry out this replacement method, a crushing head 1 for crushing the existing pipe 100, a leading steel pipe 3 connected to the crushing head 1 via an adapter 2, and a plurality of rehabilitation pipes 4 connected to the leading steel pipe 3 The crushing head 1, the adapter 2, the leading steel pipe 3, and the plurality of rehabilitated pipes 4 through the pulling wire 5, the reaction force recovery device 7 that supports the wire pulling apparatus 6, and the leading A traction pipe 8 and a rear pushing jig 9 which are connected to the steel pipe 3 and propel the rehabilitation pipe 4 are used.

  Here, the crushing head 1, the adapter 2, the rehabilitation pipe 4, the pulling wire 5, the wire pulling device 6 and the reaction force recovery device 7 are the same as those in the above-described embodiment except that the diameter of the adapter 2 is slightly enlarged. The leading steel pipe 3, the traction pipe 8, and the rear pushing jig 9 will be mainly described.

  As shown in FIG. 16, the lead steel pipe 3 includes a pipe main body 35, a short cylindrical receptacle 36 welded to the rear end of the pipe main body 35, and a short cylindrical insertion opening welded to the front end of the pipe main body 35. The main part is comprised from the part 37, 3 A of front-end | tip leading steel pipes, the intermediate | middle leading steel pipe 3B, and the termination | terminus leading steel pipe 3C are prepared corresponding to the vertical shafts S1 and S2.

  The tip leading steel pipe 3 </ b> A includes a pipe main body 35 having a set length of an outer diameter corresponding to the inner diameter of the rear connecting portion 23 of the adapter 2 and a receiving port 36 welded to the rear end of the pipe main body 35. A plurality of reinforcing ribs (round bars) 351 having a set length extending in the axial direction excluding the front end portion are welded to the rear end portion outer peripheral surface at a set interval in the circumferential direction. A plurality of connecting holes 35a are formed in the front end portion of the pipe main body 35 of the tip leading steel pipe 3A at intervals in the circumferential direction corresponding to the connecting holes 23a formed in the rear connecting portion 23 of the adapter 2. Further, a female screw (trapezoidal screw) 36 a is formed on the inner peripheral surface of the receiving port portion 36.

  The intermediate leading steel pipe 3B is welded to the pipe main body 35 having the same diameter as the pipe main body 35 of the tip leading steel pipe 3A, the insertion opening 37 welded to the front end of the pipe main body 35, and the rear end of the pipe main body 35. A plurality of set lengths of reinforcing ribs (round bars) 351 extending in the axial direction are formed on the outer peripheral surface of the front end portion and the rear end portion of the pipe body 35 at a set interval in the circumferential direction. Are welded to each other. A male screw (trapezoidal screw) 37a corresponding to the female screw 36a formed in the receiving port portion 36 of the tip leading steel pipe 3A is formed on the outer peripheral surface of the insertion port portion 37 of the intermediate leading steel tube 3B. A female screw (trapezoidal screw) 36 a corresponding to the male screw 37 a of the insertion port 37 is formed on the inner peripheral surface of 36.

  The end leading steel pipe 3 </ b> C includes a pipe main body 35 having a set length corresponding to the outer diameter of the rehabilitated pipe 4 and an insertion port portion 37 welded to the front end of the pipe main body 35. A plurality of reinforcing ribs (round bars) 351 having a set length extending in the axial direction are welded at set intervals in the circumferential direction. And the external thread (trapezoidal screw) 37a corresponding to the internal thread 36a formed in the receiving port part 36 of the intermediate | middle leading steel pipe 3B mentioned above is formed in the outer peripheral surface of the insertion port part 37 of 3 C of termination | terminus leading steel pipes. The insertion opening 37 of the end leading steel pipe 3C has a partition wall 371 at its rear end, and a joint 372 having a female thread (taper taper thread) 372a formed on the inner peripheral surface is welded to the center of the partition wall 371. ing. This joint 372 is the same as the joint 81 constituting the traction pipe 8 described later. Furthermore, in order to connect with the rehabilitation pipe | tube 4 and a volt | bolt in the rear-end part of the pipe | tube main body 35 of 3 C of termination | terminus lead steel pipes, the several connection hole 35b is formed in the circumferential direction at intervals.

  Thereby, the front end portion of the pipe main body 35 of the tip leading steel pipe 3A is fitted along the inner peripheral surface of the rear connection portion 23 of the adapter 2, the bolts are inserted through the connection holes 23a and 35a, and the nut is screwed. Thus, the tip leading steel pipe 3 </ b> A can be connected to the adapter 2.

  Further, the earliest intermediate leading steel pipe 3B is screwed into the tip leading steel pipe 3A by rotating the earliest middle leading steel pipe 3B around the axis and screwing the insertion port 37 into the receiving port 36 of the tip leading steel pipe 3A. Can be combined. Similarly, the intermediate leading steel pipe 3B subsequent to the preceding intermediate leading steel pipe 3B is rotated by rotating the subsequent intermediate leading steel pipe 3B about the axis and screwing the insertion port 37 into the receiving port 36 of the preceding intermediate leading steel pipe 3B. 3B can be screwed together. Further, the end leading steel pipe 3C is rotated about the axis and the insertion port 37 is screwed into the receiving port 36 of the final intermediate leading steel pipe 3B, whereby the end leading steel pipe 3C is screwed to the final intermediate leading steel pipe 3B. be able to.

  As described above, the leading steel pipe 3 is sequentially screwed into the female screw 36a with the male screw 37a, and the rigidity of the connecting portions thereof can be greatly improved. It is possible to resist a large bending tensile stress acting when correcting unevenness caused by detachment of the joint portion of the tubular body and to efficiently perform the connecting operation. That is, in the case where adjacent leading steel pipes 3 are connected via a plurality of bolts and nuts, if the bolts and nuts are loosened (especially, if the air hammer 16 is used, it is moved back and forth in parallel with the insertion direction, Bolts and nuts that tend to loosen are likely to loosen)), leading steel pipe 3 is likely to be bent by bending tensile stress starting from its connecting part, and the unevenness correction ability will be reduced, but this situation Can be prevented.

  In this embodiment, the leading steel pipe 3 has a tip leading steel pipe 3A and a plurality of intermediate leading steel pipes in order to keep the start shaft S1 and the reaching shaft S2 to a minimum opening area of 2.5 m in length and 1.5 m in width. 3B and the end leading steel pipe 3C are connected in order, and a pipe having a reference length constituting the existing pipe 100, specifically, 8000 mm or more corresponding to one set of a vinyl chloride pipe (nominal diameter 250 mm) having a reference length of 4000 mm. In the case where there is no restriction in excavating the shafts S1 and S2, the leading steel pipe 3 having a length corresponding to the reference length of the pipe constituting the existing pipe 100 is combined. Thus, it may be formed to a length corresponding to the length of a set of tube bodies. For example, when an existing pipe is formed by sequentially joining a fume pipe having a reference length of 2000 mm, the length of a set of pipe bodies is obtained by connecting the tip leading steel pipe 3A of 2000 mm and the end leading steel pipe 3C of 2000 mm. A leading steel pipe 3 having a corresponding length of 4000 mm may be formed.

  Therefore, when a joint portion of a set of pipes constituting the existing pipe 100 is detached and unevenness or meandering occurs in the existing pipe 100, it straddles the set of pipes that have generated unevenness. A leading steel pipe 3 can be arranged.

  As shown in FIG. 17, the traction tube 8 has a joint 81 having a female thread (taper taper thread) formed on the inner peripheral surface thereof, a front end portion welded to the joint 81, and a rear end portion corresponding to the female thread of the joint 81. The joint 81 is the same as the joint 372 provided in the terminal leading steel pipe 3C described above.

  However, the traction pipe 8 is adapted to the rehabilitation pipe 4 having the standard length and the standard traction pipe comprising the steel pipe 82 and the joint 81 having the standard length, and to the rehabilitation pipe 4 shorter than the standard length. An adjusting traction pipe composed of a short steel pipe 82 and a joint 81 is prepared.

  Further, in order to mediate the joint 372 and the earliest traction pipe 8, the joint 372 provided in the terminal leading steel pipe 3 </ b> C has a male screw () corresponding to the female thread 372 a of the joint 372 and the female thread of the joint 81 of the traction pipe 8. A leading traction pipe 83, which is a steel pipe having pipe taper threads 83a formed at the front and rear ends, is screwed (see FIG. 16).

  Therefore, after rotating the earliest traction pipe 8 around the axis center to the male screw 83a of the leading traction pipe 83 screwed to the joint 372 of the end leading steel pipe 3C, the female screw of the joint 81 is screw-coupled, and then in the following order. The traction pipe 8 having a set length can be formed by screwing the female thread of the joint 81 of the traction pipe 8 following the male thread 82a of the steel pipe 82 in the preceding traction pipe 8.

  As shown in FIG. 18, the rear pushing jig 9 is configured so that the jig main body 91 attached to the rear end portion of the rehabilitation pipe 4 and the jig main body 91 attached to the rehabilitation pipe 4 do not fall off. It is comprised from the nut member 92, the bolt member 93, and the stopper 94 which are fixed with respect to (steel pipe 82). The jig body 91 has an outer diameter disk 911 corresponding to the outer diameter of the rehabilitation pipe 4, a short cylindrical outer cylinder portion 912 welded to the outer peripheral surface of the disk 911, and an inner diameter of the female screw 41b of the rehabilitation pipe 4. A short cylindrical inner cylinder portion 913 having a corresponding outer diameter and concentrically welded to the disk 911 and the outer cylinder portion 912, a bolt member 93, as will be described later, at the center of the disk 911. A hole 91a into which the shaft portion 932 can be inserted is formed. Moreover, the outer peripheral surface of the inner cylinder part 913 of the jig main body 91 is formed in a shape corresponding to the inner peripheral surface shape of the rear end part including the female thread 41b of the rehabilitation pipe 4, and is formed on the inner peripheral surface of the rear end part of the rehabilitation pipe 4. Can be positioned.

  The nut member 92 is formed by welding a seat plate 922 to the nut 921, and the seat plate 922 has a hole through which the shaft portion 932 of the bolt member 93 can be inserted.

  The bolt member 93 includes a head portion 931 and a shaft portion 932, and an insertion hole 93 a through which the steel pipe 82 of the traction tube 8 can be inserted is formed on the same axis as the center of the shaft portion 932. A male screw corresponding to the female screw formed on the nut 921 of the nut member 92 is formed.

  The stopper 94 is formed by halving a hollow cylindrical stopper body 941 in which a through hole (not shown) having an inner diameter substantially corresponding to the outer diameter of the steel pipe 82 of the traction pipe 8 is formed. The stopper main body 941 is formed with a plurality of female screws and connecting holes formed in the horizontal direction perpendicular to the axial direction at intervals in the axial direction in the upper half and the lower half that sandwich the axial center. Then, the connecting bolt 942 is screwed into the female screw of the other stopper main body 941 through the connection hole of the one stopper main body 941 so as to be integrally connected.

  The left and right stopper main bodies 941 have through holes formed with female threads whose outer diameter is the trough diameter of the steel pipe 82. The left and right stopper main bodies 941 are attached to the steel pipe 82 of the traction pipe 8, and the connecting bolt 942 is attached. When the left and right stopper main bodies 941 are integrally connected to each other, the female thread crests into the steel pipe 82 and can be fixed so as not to move with respect to the steel pipe 82.

  A washer 95 is disposed between the bolt member 93 and the stopper 94 to prevent the bolt member 93 from coming into direct contact with the stopper 94.

  Next, a construction procedure for replacing the existing pipe 100 in which unevenness has occurred using a plurality of rehabilitating pipes 4 using the equipment configured as described above will be described.

  FIG. 14 shows a case where the air hammer 16 is fixed to the pulling shaft 14 of the crushing head 1. For this reason, the adapter 2, the leading steel pipe 3, and the rehabilitation pipe 4 are sequentially passed through the air pipe 161 for supplying compressed air to the air hammer 16, the adapter 2 is connected to the crushing head 1, and then the leading steel pipe 3 is connected to the adapter 2. Furthermore, the leading steel pipe 3 and the preceding rehabilitation pipe 4 are connected. In this case, a hole (not shown) through which the air pipe 161 passes is formed in the partition wall 371 of the end leading steel pipe 3C and the disk 911 of the jig main body 91 of the rear pushing jig 9.

  First, the start shaft S1 and the reaching shaft S2 are excavated at the start end and the end of the construction section of the existing pipe 100 to be rehabilitated, respectively. And in each shaft S1, S2, while cutting the existing pipe | tube 100 in the state protruded from the wall surface by the set length, the cut existing pipe (tube body) is removed.

  If the existing pipe (tubing body) is removed, the pulling wire 5 is inserted into the existing pipe 100 from the reaching vertical shaft S2 to the starting vertical shaft S1, and the crushing head 1 is carried into the starting vertical shaft S1 to the tip of the pulling wire 5 The provided end clamp 51 is connected to the pulling head 15 of the crushing head 1 through a pin.

  Next, after the reaction force recovery device 7 is carried into the reaching shaft S2 and installed as described above, the wire pulling device 6 is connected to the reaction force recovery device 7, and the pulling wire 5 is used as a grip mechanism of the wire pulling device 6. Fit.

  On the other hand, in the start shaft S1, the traction head 15 side of the crushing head 1 is inserted into the pipe end of the existing pipe 100 protruding from the wall surface. Then, after connecting the adapter 2 to the crushing head 1, the leading steel pipe 3 (tip leading steel pipe 3 </ b> A, intermediate leading steel pipe 3 </ b> B...) Is sequentially connected to the adapter 2.

  Thereafter, the hydraulic cylinder 61 of the wire pulling device 6 is operated to extend, and the pulling wire 5 is gripped and pulled up via the grip device. Thereby, the pulling wire 5 is pulled through the existing pipe 100 toward the reaching shaft S <b> 2, and is pulled around the pulley 62 through the center of the reaction force recovery device 7. The pulled pulling wire 5 is wound around the wire drum 52 in order. When the hydraulic cylinder 61 reaches the stroke end, the hydraulic cylinder 61 is contracted and the gripping of the pulling wire 5 by the grip device is released. Hereinafter, the pulling wire 5 is intermittently pulled toward the reaching shaft S2 by the expansion and contraction operation of the hydraulic cylinder 61. That is, the pulling wire 5 is pulled along the shortest distance in the existing pipe 100 that connects the axis of the existing pipe 100 in the start shaft S1 and the axis of the existing pipe 100 in the reaching shaft S2.

  By the pulling of the pulling wire 5, the crushing head 1 connected to the pulling wire 5 is forcibly moved toward the reaching shaft S <b> 2. When the crushing head 1 moves, the crushing blade 13 cuts and crushes the existing pipe 100 and pushes the crushing pieces along the substrate 12 to the periphery. Therefore, the space where the existing pipe 100 is crushed and pushed away by the crushing head 1 is formed along the shortest distance connecting the axis of the existing pipe 100 in the start shaft S1 and the axis of the existing pipe 100 in the reaching shaft S2. The

  Thereafter, the adapter 2 connected to the crushing head 1 moves, and the crushing pieces of the existing pipe 100 crushed by the crushing head 1 are further pushed outward. That is, the crushing head 1 crushes the existing pipe 100 and pushes away the crushing pieces to the periphery to form a space substantially corresponding to the existing pipe 100, and then the crushing pieces of the existing pipe 100 crushed by the adapter 2 are further removed. A space larger than the space substantially corresponding to the existing pipe 100 is formed by pushing away, and the leading steel pipe 3 (the tip leading steel pipe 3A, the intermediate leading steel pipe 3B...) Is introduced into the space formed by the adapter 2.

  Hereinafter, if the crushing head 1 moves toward the reaching shaft S2, the set number of intermediate leading steel pipes 3B... Are screwed in order so as to supplement the moved length, and the existing pipe 100 is crushed. It is introduced into the space where the shredded pieces are pushed away. Then, the end leading steel pipe 3C is screwed to the final intermediate leading steel pipe 3B to form a leading steel pipe 3 having a length equal to or longer than a set of tubular bodies constituting the existing pipe 100. As a result, the leading steel pipe 3A, the set number of intermediate leading steel pipes 3B, and the terminal leading steel pipe 3C are integrally connected to each other, and the leading steel pipe 3 having a length longer than the length of a set of pipes constituting the existing pipe 100 is attached to the adapter. Move following 2.

  On the other hand, if the end leading steel pipe 3C of the leading steel pipe 3 is introduced into the space formed by crushing the existing pipe 100 via the crushing head 1 and the adapter 2 and pushing the shredded pieces away, the end leading steel pipe 3C The front end of the leading traction pipe 83 is screwed to the joint 372 provided, and the coupling 81 of the traction pipe 8 is screwed to the rear end of the leading traction pipe 83. Next, after inserting the front end rehabilitation pipe 4A so that the traction pipe 8 and the front traction pipe 83 are positioned therein, and inserting the front end portion thereof into the inner peripheral surface of the rear end portion of the pipe main body 35 of the terminal leading steel pipe 3C. Then, a bolt is screwed into the front end portion of the tip renovated pipe 4A through the connection hole 35b of the pipe body 35 of the terminal leading steel pipe 3C, and the tip renovated pipe 4A is connected to the terminal leading steel pipe 3C. In this state, the rear end portion of the steel pipe 82 of the traction pipe 8 protrudes from the rear end portion of the tip renovated pipe 4A, and the rear end portion of the tip renovated pipe 4A is pushed rearward by using the protruding portion of the steel pipe 82. A jig 9 is attached.

  Specifically, the jig main body 91 is inserted into the steel pipe 82 of the traction pipe 8, and the inner cylinder part 913 and the outer cylinder part 912 are respectively inserted along the inner peripheral surface of the rear end part of the tip rehabilitation pipe 4A and attached. To do. Next, the nut member 92 and the bolt member 93 are sequentially inserted into the steel pipe 82 of the traction pipe 8, and the male screw formed on the shaft portion 932 of the bolt member 93 is screwed into the female screw of the nut member 92. Further, the washer 95 is inserted into the steel pipe 82 of the traction pipe 8 and the left and right stopper main bodies 941 divided into two parts of the stopper 94 are mounted on the steel pipe 82 of the traction pipe 8 in the vicinity of the bolt member 93, and then one stopper main body. The connecting bolt 942 is screwed into the female screw 941 through the connecting hole of the other stopper main body 941, the left and right stopper main bodies 941 are connected, and the steel pipe 82 is sandwiched. At this time, the internal thread formed in the through hole of the stopper main body 941 bites into the outer peripheral surface of the steel pipe 82 of the traction pipe 8, and the stopper 94 is fixed so as not to move with respect to the traction pipe 8. Further, if the bolt member 93 is loosened with respect to the nut member 92, the head member 931 of the bolt member 93 moves away from the nut member 92. At this time, the head portion 93 of the bolt member 93 abuts against the stopper 94 via the washer 95, and further retreat is prevented. In addition, if the bolt member 93 is loosened, the nut member 92 is relatively advanced, so the nut member 92 pushes out the jig main body 91 and abuts against the rear end portion of the tip renovated pipe 4A.

  As a result, the tip rehabilitating pipe 4A is connected to the leading steel pipe 3 (the terminal leading steel pipe 3C) through a plurality of bolts with the tip portion being circumferentially spaced, and the leading traction pipe 83, the traction pipe 8 and the rear pushing jig 9 are connected.

  When the wire pulling device 6 is operated in this state, as described above, the pulling wire 5 is intermittently pulled toward the reaching shaft S2, and the crushing head 1 breaks the existing pipe 100 to the reaching shaft S2. The leading steel pipe 3 connected to the crushing head 1 via the adapter 2 and the rehabilitation pipe 4 (tip rehabilitation pipe 4A) connected to the terminal leading steel pipe 3C move toward the reaching shaft S2. In this case, the tip rehabilitating pipe 4A is integrally connected to the terminal leading steel pipe 3C via the leading traction pipe 83, the traction pipe 8, and the rear pushing jig 9, so that the leading steel pipe 3 including the terminal leading steel pipe 3C. The movement in the direction of the reaching shaft S2 pushes the tip renovated pipe 4A toward the reaching shaft S2. Thereby, the traction force by the wire pulling device 6 can be applied to the tip rehabilitating tube 4A as a driving force in the axial direction, and sheared to a plurality of bolts connecting the terminal leading steel pipe 3C and the tip retreading tube 4A. It is possible to prevent the force from acting and to prevent the bending tensile stress from acting on the connecting portion of the tip renovated pipe 4A with respect to the terminal leading steel pipe 3C.

  Following the pulling of the lead steel pipe 3, the tip rehabilitation pipe 4A is pulled, and the tip rehabilitation pipe 4A crushes the existing pipe 100 through the crushing head 1 and the adapter 2, and pushes the crushing piece away into the space formed. If introduced, the rear pushing jig 9 attached to the rear end portion of the tip rehabilitation tube 4A is removed. That is, the bolt member 93 is slightly screwed into the nut member 92 to slightly loosen the contact with the stopper 94, and then the connection bolt 942 of the stopper 94 is loosened to release the connection between the left and right stopper main bodies 941 to be extracted from the traction pipe 8. At the same time, the washer 95, the screwed bolt member 93 and the nut member 92 are extracted from the traction pipe 8. Further, the jig main body 91 attached to the rear end portion of the tip rehabilitation pipe 4A is detached and similarly extracted from the traction pipe 8 (see FIG. 19A).

  When the rear pushing jig 9 is detached from the tip rehabilitation pipe 4A, a new joint 81 of the traction pipe 8 is screwed into the steel pipe 82 of the first traction pipe 8 protruding from the rear end of the tip rehabilitation pipe 4A. After (see FIG. 19B), the foremost intermediate rehabilitation tube 4B is inserted so that the traction tube 8 is positioned inside, and the male screw 41a is screwed to the female screw 41b of the tip rehabilitation tube 4A (FIG. 19). 19 (c)). In this state, the rear end of the steel pipe 82 of the traction pipe 8 that follows from the rear end of the first intermediate rehabilitation pipe 4B protrudes. Next, the rear pushing jig 9 is attached to the rear end portion of the first intermediate rehabilitation pipe 4B. Specifically, the jig main body 91 is inserted into the steel pipe 82 of the succeeding traction pipe 8, and the inner cylinder part 913 and the outer cylinder part 912 are aligned with the inner peripheral surface of the rear end part of the earliest intermediate rehabilitation pipe 4B. And insert (see FIG. 19D). Next, a stopper 94 comprising a nut member 92 and a bolt member 93, a washer 95, and a left and right stopper main body 941 that are loosely connected to a steel pipe 82 of the subsequent traction pipe 8 via a connecting bolt 942. Then, in the vicinity of the bolt member 93, the connecting bolt 942 is screwed to connect the left and right stopper bodies 941, and the steel pipe 82 is sandwiched (see FIG. 19 (e)). At this time, the internal thread formed in the through hole of the stopper main body 941 bites into the steel pipe 82 of the traction pipe 8, and the stopper 94 is fixed so as not to move with respect to the traction pipe 8. Further, by loosening the bolt member 93 with respect to the nut member 92, the head portion 93 is abutted against the stopper 94 via the washer 95. If the bolt member 93 is loosened, the nut member 92 is relatively advanced, and the jig main body 91 against which the nut member 92 is abutted is advanced, and the rear end portion of the first intermediate rehabilitation pipe 4B is moved forward. Hit it.

  As a result, the foremost intermediate rehabilitation pipe 4B is screwed to the front end rehabilitation pipe 4A, and the leading traction pipe 83, the traction pipe 8 and the rear pushing jig with respect to the leading steel pipe 3 (terminal leading steel pipe 3C). 9 is connected.

  In this state, by operating the wire pulling device 6, the pulling wire 5 is intermittently pulled toward the reaching shaft S2, and the crushing head 1 moves toward the reaching shaft S2 while crushing the existing pipe 100. The leading steel pipe 3 connected to the crushing head 1 via the adapter 2 and the rehabilitating pipe 4 (the tip rehabilitating pipe 4A and the first intermediate rehabilitating pipe 4B) connected to the terminal leading steel pipe 3C are directed toward the reaching shaft S2. Moving. In this case, the foremost intermediate rehabilitation pipe 4B is connected to the terminal leading steel pipe 3C via the front end rehabilitation pipe 4A, and is integrated with the front traction pipe 83, the traction pipe 8 and the rear pushing jig 9. By being connected, the movement of the leading steel pipe 3 including the terminal leading steel pipe 3C in the direction of the reaching shaft S2 pushes the foremost intermediate rehabilitating pipe 4B toward the reaching shaft S2. Thereby, it is possible to prevent the bending tensile stress from acting on the screw coupling portions of the tip rehabilitating tube 4A and the first intermediate rehabilitating tube 4B. That is, when passing through the unevenness of the existing pipe 100, bending tensile stress is likely to act on the connecting portion, and the rehabilitation pipe 4 may fall off, but the traction force by the wire pulling device 6 is applied to the rehabilitation pipe 4. Therefore, since the bending tensile stress does not act on the connecting portion of the rehabilitating pipe 4, it is possible to reliably prevent the rehabilitation pipe 4 from falling off.

  Following the pulling of the leading steel pipe 3, the tip rehabilitation pipe 4A and the first intermediate rehabilitation pipe 4B are pulled, and the first intermediate rehabilitation pipe 4B crushes the existing pipe 100 via the crushing head 1 and the adapter 2, If the fragment is pushed into the space formed (see FIG. 19 (f)), after removing the rear pushing jig 9 attached to the rear end of the first intermediate rehabilitation pipe 4B, Work as described above.

  That is, the stopper 94 of the rear pushing jig 9 with respect to the final traction pipe 8 is released and removed from the traction pipe 8, and the washer 95, the bolt member 93 and the nut member 92 are extracted from the traction pipe 8, and the jig The main body 91 is detached from the earliest intermediate rehabilitation pipe 4B (the preceding intermediate rehabilitation pipe 4B) and extracted from the traction pipe 8. Next, after the joint 81 of the succeeding traction pipe 8 is screwed to the steel pipe 82 of the preceding traction pipe 8, the subsequent intermediate rehabilitation pipe 4B is screwed to the preceding intermediate rehabilitation pipe 4B through the subsequent traction pipe 8. Then, the jig body 91 of the rear pushing jig 9 is attached to the rear end portion of the succeeding intermediate renovated pipe 4B through the steel pipe 82 of the succeeding traction pipe 8, and the bolt member 93, the nut member 92, and the washer 95 are successively followed. After the steel pipe 82 of the traction pipe 8 is inserted, the stopper 94 is inserted into the steel pipe 82 of the subsequent traction pipe 8 and fixed to the steel pipe 82 of the traction pipe 8 in the vicinity of the bolt member 93. Next, after fixing the jig main body 91 to the rear end portion of the subsequent intermediate rehabilitation pipe 4B via the bolt member 93, the crushing head 1 is connected to the existing pipe via the pulling wire 5 by operating the wire pulling device 6. The rehabilitation pipe 4 (the tip rehabilitation pipe 4A and the intermediate rehabilitation pipe 4B...) Connected to the leading steel pipe 3 (the terminal leading steel pipe 3C) moves toward the reaching vertical shaft S2. Move. In this case, the succeeding intermediate rehabilitation pipe 4B is connected to the terminal leading steel pipe 3C via the preceding intermediate rehabilitation pipe 4B including the tip rehabilitation pipe 4A, and the leading traction pipe 83, the plurality of traction pipes 8 and The movement in the direction of the reaching shaft S2 of the leading steel pipe 3 including the terminal leading steel pipe 3C is integrated with the rear pushing jig 9 so that the rear end portion of the subsequent intermediate rehabilitating pipe 4B is moved to the reaching shaft S2. Will be pushed out. Thereby, it is possible to prevent the bending tensile stress from acting on the screw connection portion of the preceding intermediate rehabilitating tube 4B including the tip rehabilitating tube 4A and the first intermediate rehabilitating tube 4B and the subsequent intermediate rehabilitating tube 4B.

  When connecting the intermediate rehabilitation pipe 4B, a hollow cylindrical foamed polystyrene having an outer diameter corresponding to the inner diameter of the rehabilitation pipe 4 and an inner diameter insertion hole corresponding to the outer diameter of the steel pipe 82 of the traction pipe 8 is used. It is preferable to insert a spacer into the steel pipe 82 of the traction pipe 8 and interpose it in the rehabilitation pipe 4 at a set interval to prevent foreign matter such as earth and sand from entering the rehabilitation pipe 4.

  By the way, the joint portion of one or a plurality of sets of pipes constituting the existing pipe is detached due to an earthquake and a liquefaction phenomenon accompanying the earthquake, and one or a plurality of uneven areas are generated in the existing pipe 100. Even so, the leading steel pipe 3 having a length equal to or longer than the length of the set of pipes constituting the existing pipe 100 is a set in which the unevenness and the like are generated together with the crushing head 1 and the adapter 2 that are integrally connected. Each unevenness and the like can be corrected in order by moving so as to extend along the shortest distance by the pulling wire 5 across the tube body. At this time, a large bending tensile stress acts on the leading steel pipe 3 that corrects the unevenness of the existing pipe 100, but the tip leading steel pipe 3A, the plurality of intermediate leading steel pipes 3B, and the terminal leading steel pipe 3C are screwed together, Bending tensile stress can be resisted by greatly improving the rigidity of the connecting portion.

  Hereinafter, if the intermediate rehabilitating pipe 4B is introduced in accordance with the movement of the crushing head 1 by operating the wire pulling device 6 to pull the pulling wire 5, the rear pushing unit fixed to the intermediate rehabilitating pipe 4B is introduced. After removing the tool 9, the traction pipe 8 is connected, the subsequent intermediate rehabilitation pipe 4B is connected, the rear pushing jig 9 is attached and fixed, the traction wire 5 is pulled, and the existing pipe 100 is crushed. The crushed pieces are pushed away to the surroundings, and the introduction of the intermediate rehabilitation pipe 4B that follows the space where the unevenness of the existing pipe 100 is corrected is repeated.

  If the crushing head 1 reaches the reaching shaft S2, the crushing head 1 is pulled to the vicinity of the rear support plate 72 of the reaction force recovery device 7, and then the connection between the adapter 2 and the tip leading steel pipe 3A is released, and the tip leading steel pipe The screw connection between 3A and the first intermediate leading steel pipe 3B is released, and the crushing head 1 and the tip leading steel pipe 3A are collected on the ground. Next, the pulling jig 38 shown in FIG. 20, specifically, a female screw 38a corresponding to the male screw 37a of the insertion opening 37 of the intermediate leading steel pipe 3B is formed, and the pulling wire 5 is connected to the end clamp 51 and the pin. A short cylinder lid-like traction jig 38 having a traction head 381 that can be connected to each other, and the female screw 38a of the traction jig 38 is screwed to the male screw 37a of the first intermediate leading steel pipe 3B. After connecting the end clamp 51 of the pulling wire 5 to the pin 381 via a pin and then operating the wire pulling device 6, a plurality of intermediate leading steel tubes 3B following the earliest intermediate leading steel tube 3B at the head. Can be withdrawn to the reaching shaft S2. Next, the traction jig 38 is detached from the earliest intermediate leading steel pipe 3B, and after the screw connection between the earliest intermediate leading steel pipe 3B and the subsequent intermediate leading steel pipe 3B is released, the earliest intermediate leading steel pipe 3B is removed. Collect on the ground. Similarly, the intermediate leading steel pipe pulled out to the reaching shaft S2 by repeatedly releasing the screw connection between the preceding middle leading steel pipe 3B and the succeeding middle leading steel pipe 3B and collecting the preceding middle leading steel pipe 3B on the ground. Remove 3B. If the intermediate leading steel pipe 3B reaching the reaching shaft S2 is removed, as described above, the pulling jig 38 is connected to the preceding intermediate leading steel pipe 3B facing the reaching shaft S2, and the wire pulling device 6 is operated to make a plurality of pieces. After the main intermediate steel pipe 3B is drawn out to the reaching shaft S2, the screw connection with the subsequent intermediate leading steel pipe 3B is sequentially released from the preceding intermediate leading steel pipe 3B, and then recovered on the ground. Thereafter, the same operation is performed, and the end leading steel pipe 3C screwed to the final intermediate leading steel pipe 3B together with the plurality of intermediate leading steel pipes 3B is pulled out to the reaching shaft S2, and the screw coupling is sequentially released and recovered to the ground. .

  At this time, the introduction of the intermediate renovated pipe 4B is continued in accordance with the withdrawal of the intermediate leading steel pipe 3B, and the terminal renovated pipe 4C is introduced in accordance with the withdrawal of the terminal leading steel pipe 3C.

  If the end leading steel pipe 3C is collected, the tip renovated pipe 4A connected to the end leading steel pipe 3C is drawn out to the reaching shaft S2.

  In this case, since the leading traction pipe 83 and the plurality of traction pipes 8 are sequentially connected to the joint 372 of the terminal leading steel pipe 3C, the bolt connection of the terminal leading steel pipe 3C to the tip renovated pipe 4A is released. At the same time, when the screw connection between the leading traction pipe 8 and the joint 372 is released by rotating the terminal leading steel pipe 3C around the axis, a plurality of traction pipes 8 below the leading traction pipe 83 are left in the rehabilitation pipe 4. About these leading traction pipes 83 and a plurality of traction pipes 8, by hanging around a rope or the like, pulling out sequentially to the reaching shaft S2 using a winch, releasing the screw connection and collecting on the ground, It can be removed from the rehabilitation tube 4.

  If the leading traction tube 83 and the plurality of traction tubes 8 are removed, the wire traction device 6 and the reaction force recovery device 7 are recovered on the ground.

  As described above, due to an earthquake and a liquefaction phenomenon associated with the earthquake, the existing pipe 100 such as a sewer pipe or the like is uneven or meandering at one or more places based on the separation of the joint between the pipes constituting the existing pipe 100. Even if an outbreak occurs, it is possible to replace the landscaping with the rehabilitation pipe 4 while correcting the landscaping, etc., so it is difficult to restore the current state of the sewer pipes etc. where the landscaping occurred due to an earthquake etc. Even in such a case, it can be promptly restored to a usable state.

DESCRIPTION OF SYMBOLS 1 Crushing head 2 Adapter 3 Leading steel pipe 3A Tip leading steel pipe 3B Middle leading steel pipe 3C Termination leading steel pipe 31, 35 Pipe main body 32, 33 Receptacle 36 Receptacle part 37 Insertion part 38 Pulling jig 4 Rehabilitation pipe 4A End rehabilitation pipe 4B Intermediate rehabilitation Pipe 4C Terminal rehabilitation pipe 5 Pulling wire 6 Wire pulling device 7 Reaction force recovery device 8 Pulling tube 81 Joint 82 Steel pipe 83 Leading pulling tube 9 Rear pushing jig 91 Jig body 92 Nut member 93 Bolt member 94 Stopper 100 Existing pipe 200 Installation tube

Claims (6)

  A pulling wire is inserted into an existing pipe buried in the ground by joining a plurality of pipes in sequence from the reaching shaft to the starting shaft, and a pulling wire is provided to the crushing head provided with a crushing blade for crushing the existing tube in the starting shaft. In addition, the crushing head is inserted into the existing pipe, and further, the leading steel pipe having a length longer than the length of a set of pipes constituting the existing pipe is connected to the crushing head, and the pulling wire is pulled. Following the movement of the crushing head by pulling the pulling wire, the rehabilitation pipe made of synthetic resin is connected to the leading steel pipe in order, and the crushing head is crushed by the movement of the crushing head and the crushed pieces are pushed away to the surroundings. A method for replacing an existing pipe, wherein a leading steel pipe and a rehabilitation pipe are introduced in this order into a space formed by crushing.   2. The method of replacing an existing pipe according to claim 1, wherein the leading steel pipe is formed by sequentially connecting a leading end leading steel pipe, one or a plurality of intermediate leading end steel pipes and a terminating leading end steel pipe, or a leading end leading end steel pipe and a terminating end leading steel pipe. A method for replacing an existing pipe, wherein the pipes are formed by connecting.   3. The method for replacing an existing pipe according to claim 1, wherein a plurality of reinforcing ribs extending in the pipe axis direction are provided on the outer peripheral surface of the leading steel pipe at intervals in the circumferential direction. Replacement method.   In the replacement method of the existing pipe | tube as described in any one of Claim 1 thru | or 3, the adapter larger diameter than the outer diameter of an existing pipe | tube is connected with the said crushing head, and a leading steel pipe is connected with an adapter. A replacement method for existing pipes.   In the method for replacing an existing pipe according to claim 1, when the installation pipe is connected to the existing pipe, the installation pipe is separated from the existing pipe prior to the replacement of the existing pipe with the rehabilitation pipe, and the existing pipe is After replacing the rehabilitation pipe, a connection port is formed in the connection part of the rehabilitation pipe with the mounting pipe, and the pipe end part of the detached mounting pipe and the connection port of the rehabilitation pipe are connected via a repair member. To replace existing pipes.   2. The replacement method for an existing pipe according to claim 1, wherein a leading traction pipe is connected to an inner side of a rear end portion of the leading steel pipe, and a plurality of traction pipes are sequentially connected to a distal end traction pipe, while A method for replacing an existing pipe, characterized in that the tool is fixed to the final traction pipe in a state where the tool hits the rear end of the final rehabilitation pipe.

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