JPH07993B2 - Supporting device for buried pipe in propulsion method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for a buried pipe in a propulsion method, and more specifically, when an underground buried pipe such as a sewer is constructed, a buried hole is formed in the ground without excavating the ground. However, in the so-called propulsion method, in which the embedded pipes are sequentially promoted and embedded in the formed embedding holes,
The present invention relates to a support device for holding and fixing an embedded pipe with respect to a propulsion shaft that is connected to a leading conductor that forms an embedded hole.

[0002]

2. Description of the Related Art In the conventional propulsion method, a tube material having mechanical strength or axial load-carrying capacity such as a fume tube or a steel tube is usually used as a buried tube. It was said that tubing materials with poor directional load capacity could not be used. This is because in the conventional propulsion method, a buried pipe is connected to the rear of the front conductor of an auger or a mud digging machine, and a thrust force is applied to the last buried pipe with a push jack installed in the shaft. In addition, it overcomes the friction resistance and excavation resistance of the ground, and promotes the buried pipe row and the lead conductor into the ground. Therefore, a very large force is applied to the end face of the buried pipe row, particularly the tailmost buried pipe, and the pipe material having no durability is locally deformed or damaged.

Therefore, the inventors of the present invention hold and fix the buried pipe on the propulsion shaft that is passed through the center of the buried pipe and is connected to the front conductor.
Invented a method that disperses the propulsive force applied to the buried pipe row, the frictional resistance from the ground, etc., for each buried pipe or for each suitable number of buried pipes, and transmits it to the propulsion shaft. First, Japanese Patent Application Nos. 1-183271 and 1-2
Patent applications have been filed in Japanese Patent Application No. 40408 and Japanese Patent Application No. 2-289901.

In these methods, since the force can be transmitted to the propulsion shaft by being dispersed at a plurality of positions in the buried pipe row, the conventional method of transmitting the force only at the tail or the beginning of the buried pipe row. Compared with the method, the force applied to each buried pipe can be significantly reduced. In addition, if the rubber expansion bag provided in the support device is pressed against the inner surface of the embedded pipe and the embedded pipe is supported by the friction supporting force that acts between them, a uniform force is applied to the entire circumference of the embedded pipe. As compared with applying a force to the end of the buried pipe, the buried pipe is less likely to be locally deformed or damaged. As a result, the propulsion method can be applied even to a pipe material having a poor axial load resistance such as the above-mentioned PVC pipe.

Furthermore, the inventors have found that the outer circumference of the propulsion shaft is
A support device in which a slender expansion tube is spirally wound and its outer circumference is covered with an outer cover made of rubber or the like, and the entire surface of the outer cover is evenly expanded to increase the friction supporting force for the buried pipe. And patent application in Japanese Patent Application No. 3-130656. In this device, since one expansion tube wound in a spiral shape can support a wide range of embedded pipes, equipment such as pressure air piping is simplified. Further, since the entire length of the expansion tube is uniformly expanded, a uniform frictional supporting force can be exerted on the entire circumference and length of the buried pipe, so that the buried pipe can be efficiently supported and the buried pipe There is no problem of locally deforming by applying a biased force. Further, since the outer circumference of the expansion tube is covered with the outer cover, it is possible to favorably prevent the spirally wound expansion tube from being axially displaced or scratched due to frictional resistance from the embedded tube. It also has advantages such as.

[0006]

However, in the supporting device using the expansion tube spirally wound as described above, it is necessary to change the structure of the entire supporting device when the diameter of the buried pipe changes. However, there is a problem that the flexibility of changing the diameter of the buried pipe is poor. This is because in the above support device, the entire outer diameter of the spirally wound expansion tube is designed according to the inner diameter of the buried pipe, and if the inner diameter of the buried pipe changes, the wound outer diameter of the expansion tube. Also has to change. In order to change the winding outer diameter of the expansion tube, it is necessary to change the thickness of the expansion tube itself, or to replace the support tube around which the expansion tube is wound with a larger outer diameter.

Therefore, every time the diameter of the buried pipe changes,
It takes time and effort to reattach a support device with different outer diameters of winding of the expansion tube to the propulsion shaft, resulting in a decrease in work efficiency. Since it is necessary to manufacture and prepare a plurality of types of support devices having different expansion tube winding outer diameters, equipment costs increase. Therefore, an object of the present invention is to provide a support device for a buried pipe using the above-described spirally wound expansion tube that can easily cope with a change in the pipe diameter of the buried pipe. .

[0008]

In order to solve the above-mentioned problems, a buried pipe supporting device in a propulsion method according to the present invention is
A support device for holding and fixing an embedded pipe to a propulsion shaft that is connected to the rear of the front conductor and transmits a propulsive force to the front conductor. An expansion tube that expands toward the outer peripheral side when supplied, an outer cover that covers the outer periphery of the expansion tube, and a diameter adjustment member that is detachably attached to the outer periphery of the outer cover and is movable in the radial direction together with the outer cover. Is equipped with.

The expansion tube is made of a material which can be elastically deformed, such as rubber or a flexible synthetic resin, and can be expanded by supplying a pressure medium such as air, water or oil into the expansion tube. It is formed into a shape. The material, thickness, and outer shape of the expansion tube are set in consideration of conditions such as the applicable range of the diameter of the buried tube and the magnitude of frictional supporting force to be transmitted. The cross-sectional shape of the expansion tube depends on whether or not fluid pressure is supplied to the inside.
Those that can be largely deformed in the thickness direction are preferable. Specifically, when the fluid pressure is not supplied to the expansion tube, it is preferably a flat elliptical shape or an elliptical shape, and when the fluid pressure is supplied, the expansion tube expands in the minor axis direction and becomes close to a circular shape.

The expansion tube surrounds the outer circumference of the propulsion shaft and is arranged in a spirally wound state at a position facing the inner surface of the buried pipe. If the diameter of the buried pipe is small, it is possible to wind the expansion tube directly on the outer peripheral surface of the propulsion shaft, but normally it will be separated from the outer peripheral surface of the propulsion shaft by a certain distance. It is preferable to attach a concentric support tube and wind the expansion tube around the support tube. If the support cylinder is detachably attached to the propulsion shaft with bolts or the like, the support device can be easily attached to and detached from the propulsion shaft. The space between the support cylinder and the propulsion shaft is used as the above-mentioned survey space or a passage space for various piping cables.

The expansion tubes may be wound so as to be in close contact with each other so that the adjacent expansion tubes come into contact with each other, or may be wound with a space therebetween. It is preferable to provide a regulating member that can come into contact with the side surface of the expansion tube so that the wound expansion tube does not move in the axial direction of the propulsion shaft. The restricting member may be in contact with only both end side surfaces of the entire expansion tube. If a restricting member having a spiral shape is provided in accordance with the spiral shape of the expansion tube, each winding circle of the expansion tube The movement can be reliably regulated for each lap. Further, the lower surface of the expansion tube may be fixed to the support cylinder. Further, by providing the expansion tube so as to be movable to some extent, it may be possible to perform the action of adjusting the contact with the inner peripheral surface of the buried tube or the deviation of the frictional support force.

At the end of the expansion tube,
A pressure medium supply / discharge port for supplying and discharging the pressure medium is provided. Various valve devices used for connecting ordinary pressure pipes and hoses are attached to the supply / discharge ports. As for the expansion tube, one continuous expansion tube may be wound over the entire length of one propulsion shaft, or the total length of the propulsion shaft may be divided into a plurality of parts.
It may be wound with a plurality of expansion tubes so as to cover the entire length of the propulsion shaft. In this case, separate fluid pipes may be connected to the pressure medium supply / discharge ports of the respective expansion tubes, or the pressure medium supply / discharge ports of the respective expansion tubes may be connected in sequence so that a plurality of expansion tubes are provided with a single fluid pipe. The fluid pressure may be supplied from the fluid pipe.

Further, when a plurality of expansion tubes are horizontally aligned and spirally wound at the same time, a plurality of expansion tubes are alternately arranged into a cylindrical shape surrounding the outer periphery of the propulsion shaft. It is wound. This is a so-called double spiral or double spiral structure. In this case, the pressure medium supply / discharge ports of the respective expansion tubes can be arranged side by side on the end surface of the wound expansion tube, which facilitates connection to the fluid pipe. Also, if the pressure medium supply to each expansion tube can be controlled independently, even if one expansion tube is damaged, it does not affect the other expansion tubes,
It is possible to prevent the hindrance of the support of the buried pipe, and to supply the fluid pressure only to an appropriate number of expansion tubes in accordance with the required friction supporting force and the durability of the buried pipe. Such an operation can be easily realized by appropriately designing the arrangement structure of the fluid piping and the piping design such as the pressure control valve.

The expansion tube may be wound over the entire length in the axial direction of the propulsion shaft, may be wound only over a fixed length near the center, or around the front and rear ends. It may be wound around a plurality of places intermittently. The outer circumference of the expansion tube is covered with an outer cover. The outer cover is made of a material that can be expanded / contracted or deformed according to the expansion / contraction deformation of the expansion tube. Further, it is preferable to use a material having a large friction coefficient so that the friction supporting force of the diameter adjusting member attached to the outer periphery of the outer cover becomes large. A material that has a large coefficient of friction with the inner surface of the buried pipe and can prevent the expansion tube from being scratched or worn so that it can be used even when the diameter adjusting member is removed is preferable. Specifically, an elastic material made of rubber or the like similar to the expansion tube can be used. The outer cover itself may not be elastically deformable, but may be attached so that it can be moved or deformed as the expansion tube expands and contracts. Specifically, abrasion-resistant knitted fabric, synthetic resin sheet, or the like can be used.

The outer cover may be attached and fixed to the expansion tube, but it is better to be directly fixed to the propulsion shaft through a support cylinder or the like to which the expansion sheet is attached. This is because it is possible to prevent the frictional resistance force acting in the axial direction of the outer cover from the embedded pipe via the diameter adjusting member from being transmitted to the expansion tube. If the outer surface of the outer cover, which comes into contact with the diameter adjusting member, has fine irregularities such as protrusions and grooves, or is subjected to surface treatment for increasing the friction coefficient, the diameter adjusting member and the The supporting force for the buried pipe can be further increased. Conversely, if the contact surface between the jacket cover and the expansion tube is made slippery, it is difficult for axial force to be applied to the expansion tube from the jacket cover, and axial displacement and deformation of the expansion tube can be prevented. .

The outer cover may cover the entire expansion tube with a single outer cover, and may be attached in a cylindrical shape. However, a plurality of strip-shaped outer cover covers along the axial direction of the propulsion shaft body, It is easier to deform the expansion tube due to the expansion and contraction and to reliably transmit the friction supporting force if the expansion tubes are mounted in a state of being arranged on the circumference. Even if there is a certain amount of gap between the divided outer covers, the entire frictional supporting force can be sufficiently secured.

The diameter adjusting member is detachably attached to the outer periphery of the outer cover, and is used such that the outer peripheral surface of the diameter adjusting member abuts the inner surface of the buried pipe. Further, the diameter adjusting member needs to be movable in the radial direction according to the expansion and contraction of the outer cover. The diameter adjusting member may be in contact with the entire outer peripheral surface of the outer cover and the entire inner peripheral surface of the buried pipe, but may be in partial contact with the outer cover and the buried pipe within a range in which a necessary friction supporting force acts. May be. The diameter adjusting member may be mounted so that the ring-shaped diameter adjusting member is fitted onto the outer circumference of the outer cover, or the diameter adjusting members formed in the circumferential direction are arranged side by side on the outer circumference of the outer cover. You may do it. When the diameter adjusting member is formed in a divided manner in the circumferential direction, the diameter adjusting member is arranged evenly in the entire circumferential direction of the outer cover and the buried pipe. It is also possible to use a diameter adjusting member divided into a plurality of pieces in the axial direction of the outer cover.

As a material for the diameter adjusting member, at least a portion which comes into contact with the outer cover and the buried pipe has a friction coefficient and durability capable of transmitting a necessary friction supporting force. Specifically, the material may be the same as the material of the outer cover described above, and a material such as rubber or synthetic fiber cloth which is easily deformable can be used. The diameter adjusting member may have any shape such as a plate shape or a block shape as long as it can contact the outer peripheral surface of the outer cover and the inner peripheral surface of the embedded pipe. The inner and outer peripheral surfaces of the diameter adjusting member may be formed in a curved surface shape according to the curvature of the outer cover or the buried pipe, or may be a sheet shape that is easily deformed or a small area. If it is flat, it may be flat. As a specific example of the diameter adjusting member, it is possible to use a block formed by division and movably connected by a flexible rubber belt or a metal chain. A sheet-shaped diameter adjusting member which is elastically deformable like the outer cover may be mounted on the outer cover in a stacked manner.

As the diameter adjusting member, it is preferable to prepare a diameter adjusting member having a different outer diameter for each pipe diameter of the buried pipe to be applied, and replace it with the outer cover for use. However, if the difference in the pipe diameter of the buried pipe is small, it can be dealt with by adjusting the expansion and contraction amount of the outer cover and expansion tube, so use one diameter adjusting member for multiple buried pipes with different diameters. Is also possible.

As means for removably attaching the diameter adjusting member to the outer cover, a fastener such as a bolt is used,
A ring-shaped diameter adjusting member may be fitted into the outer cover. The diameter adjusting member may be attached to a structural member that fixes the outer cover. If the diameter adjustment member is made up of multiple plates or sheets that are stacked in the radial direction and attached so that the number of these plates or sheets to be overlapped can be freely changed, one diameter adjustment member can be used The range of application for the pipe diameter is greatly expanded.

The embedded pipe supporting device described above can be attached to a propulsion shaft having any conventional structure. The propulsion shaft body is made of a steel pipe or the like, and has a screw conveyor for discharging soil therein, a muddy water supply and discharge passage, and a rotary shaft for rotationally driving the auger of the leading conductor. If the support device is detachably attached to the propulsion shaft body by bolt fastening or the like, the support device can be attached and used only on the necessary propulsion shaft body.

Regarding the structure of the lead conductor and the specific method of the propulsion method, the usual propulsion method can be applied as it is, and examples thereof include an auger excavation method, a mud pressure method, a consolidation method, and the like. The structure of the mechanical device provided in the leading conductor is different. The buried pipe supported by the supporting device of the present invention can exert a great effect when used in a pipe material having a relatively poor axial load resistance, such as the above-mentioned PVC pipe or FRPM pipe, Even if a fume pipe or a steel pipe has a relatively small wall thickness, a preferable effect can be obtained.

[0023]

In the supporting device in which the outer circumference of the spirally wound expansion tube is covered with the outer cover, the outer peripheral surface of the outer cover is radially expanded and contracted by supplying the pressure medium to the expansion tube. I do. When the outer cover expands, if it contacts the inner surface of the embedded pipe and can exert a sufficient friction supporting force, the propulsion shaft supports the embedded pipe in this state. Even if the diameter of the buried pipe changes,
If the change in pipe diameter is slight, it may be possible to deal with it by simply adjusting the expansion amount of the outer cover.

However, the diameter of the buried pipe changed greatly,
Even if the outer cover is expanded, if the inner surface of the buried pipe cannot be contacted or sufficient frictional supporting force is not generated, the diameter adjusting member is attached to the outer cover. If the diameter adjusting member is attached to the outer cover, the overall outer diameter can be increased. If the diameter adjustment member can move in the radial direction as the jacket cover expands and contracts, the outer surface of the diameter adjustment member is brought into contact with the inner surface of the buried pipe when the jacket cover is expanded to ensure sufficient friction. Supporting force can be applied.

If diameter adjusting members having different outer diameters are prepared in accordance with the diameter of the buried pipe and are replaced and mounted on the outer periphery of the outer cover, different support devices including the same expansion tube and outer cover can be used. It becomes possible to reliably support even a buried pipe having a pipe diameter. Replacing the diameter adjusting member is much easier than replacing the entire supporting device, and the cost of manufacturing a plurality of diameter adjusting members is not so high. The equipment cost will be much cheaper than preparing.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a use state of the supporting device according to the present invention. A shaft V is excavated in the ground E, and a buried hole H is horizontally excavated from the side wall of the shaft V. The front conductor 1 having the auger 10 at its tip is connected to the rear end of the propulsion shaft body 2 made of a steel pipe or the like in order to be added. Inside the propulsion shaft body 2, a screw conveyor 11 for rotationally driving the auger 10 and discharging the soil is provided. The rear end of the propulsion shaft body 2 is adapted to receive a thrust from an original push jack (not shown) installed in the vertical shaft V.

The buried pipe 3 made of a polyvinyl chloride pipe or the like is the lead conductor 1
Is sequentially added to the rear of the so as to surround the outer periphery of the propulsion shaft body 2. The buried pipe 3 may be fixed to the lead conductor 1, but it is not necessary to transmit the propulsive force from the lead conductor 1, and therefore it is sufficient to connect the buried pipe 3 to the lead conductor 1 so as not to separate from the lead conductor 1. A support device 4 is attached to the propulsion shaft 2. The outer periphery of the support device 4 abuts on the inner surface of the embedded pipe 3, and the embedded pipe 3 is attached and fixed to the support device 4, that is, the propulsion shaft body 2 by the friction supporting force generated between the support device 4 and the inner surface of the embedded pipe 3. To do.
Therefore, the thrust force applied to the propulsion shaft body 2 from the original push jack is transmitted to the embedded pipe 3 via the support device 4, and the embedded pipe 3 is propelled against the frictional resistance applied to the embedded pipe 3 from the ground E. Let

1 and 3 show the overall structure of the supporting device 4. A supporting cylinder 50 having a cylindrical shape concentric with the propulsion shaft 2 is attached to the propulsion shaft 2 with interposing disk-shaped both-end support plates 54, 54. The support cylinder 50 is provided up to almost both ends of the propulsion shaft 2. As shown in FIG. 3, the both end support plates 54, 54 are provided with an opening 56 serving as an irradiation path of a laser beam for surveying, and a through path 58 serving as a path for a power cable to the leading conductor 1 and the like. There is.

An expansion tube 60 is spirally wound around the outer surface of the support cylinder 50. Expansion tube 60
Is a long and thin rubber tubular body, and is provided with valve devices 62, 62 at both ends serving as supply / discharge ports for the pressure medium. A pipe 70 is connected to the valve devices 62, 62, and the pipe 70 is connected to a shaft V or a pressure medium source installed on the surface of the earth.

The outer circumference of the expansion tube 60 is covered with an outer cover 80 made of a belt-shaped rubber sheet or the like. Figure 4
As shown in detail in FIG.
Bolts 57 are fastened to flange portions 55 provided at both ends of the support cylinder 50. As shown in FIG. 3, the outer cover 80 covers the outer circumference of the expansion tube 60 by dividing it into a plurality of pieces (six pieces in the figure) in the circumferential direction.

On the outer periphery of the outer cover 80, a diameter adjusting member 84 having an annular shape as a whole is mounted. Diameter adjusting member 84
Is a prismatic adjustment block 85 made of laminated rubber plates,
The adjustment blocks 85 are arranged at regular intervals in the circumferential direction of the outer cover 80, and the adjustment blocks 85 are connected and integrated by a stretchable connection band 86 made of rubber or the like. The adjusting blocks 85, 85 are connected not by the connecting band 86 but by a connecting bolt 87 at a part of the circumferential direction. At the place of this connecting bolt 87,
By opening and closing the ring-shaped diameter adjusting member 84, the outer cover 80
Removably attached to the outer periphery of. The thickness of the diameter adjusting member 84 is such that when the diameter adjusting member 84 is attached to the outer cover 80.
The outer diameter is set to be slightly smaller than the inner diameter of the buried pipe 3.

As shown in FIG. 1, a plurality of (four in the figure) diameter adjusting members 84 are mounted side by side along the axial direction of the outer cover 80. Depending on the ground conditions at the time of carrying out the propulsion construction, the number of the diameter adjusting members 84 mounted may be reduced,
It can also be used in a state in which there is a space between the diameter adjusting members 84. Support device 4 having the above structure
The use of is explained.

As shown in FIGS. 1, 3 and 4, in a state where the pressure medium is not supplied to the expansion tube 60,
The expansion tube 60 has a flat oval shape, and the outer cover 80 is also flat. The outer diameter of the diameter adjusting member 84, that is, the outer diameter of the entire supporting device 4 is set to be slightly smaller than the inner diameter of the buried pipe 3. Therefore, the propulsion shaft body 2 to which the supporting device 4 is attached can be easily inserted into the embedded pipe 3.

As shown in FIG. 5, when a pressure medium is supplied to the expansion tube 60 to expand the expansion tube 60,
Since the inner peripheral side of the expansion tube 60 is regulated by the support cylinder 50, the entire expansion tube 60 expands and moves to the outer peripheral side. When the expansion tube 60 expands to the outer peripheral side,
The outer cover 80 also deforms so as to expand to the outer peripheral side, the diameter adjusting member 84 moves to the outer peripheral side with the deformation of the outer cover 80, and the outer peripheral surface of the diameter adjusting member 84 is pressed against the inner surface of the buried pipe 3. Applied. As a result, a frictional supporting force is generated between the diameter adjusting member 84 and the inner surface of the embedded pipe 3, so that the embedded pipe 3, the support device 4, and the propulsion shaft 2 are connected and fixed.

In this way, the integrated structure of the propulsion shaft body 2 and the buried pipe 3 via the supporting device 4 is arranged behind the front conductor 1 as shown in FIG. The first conductor 1
Connect and fix to. The propulsion shafts 2 are sequentially added rearward and connected and fixed. The embedded pipes 3 are also sequentially joined by fitting and adhering with a sleeve. When a thrust force is applied to the rearmost end of the propulsion shaft body 2 by a pushing jack or the like, the propulsion shaft body 2 and the front conductor 1 are propelled, and the embedded pipe 3 supported by the propulsion shaft body 2 is also propelled. In addition, in FIG. 2, all the buried pipes 3 are supported by the supporting device 4 inside thereof, that is, the propulsion shaft body 2. However, if the magnitude of the friction resistance force from the ground E and the durability of the buried pipe 3 are taken into consideration. , Some buried pipes 3
It is possible to propel only by supporting only the propelling shaft 2. It is not necessary to attach the supporting device 4 to the propulsion shaft body 2 that does not support the embedded pipe 3.

As described above, the embedded pipe 3 is propelled into the ground E together with the front conductor 1 and the propulsion shaft body 2, and the embedded hole H is formed.
Simultaneously with the formation, the buried pipe 3 is laid in the buried hole H. After the buried pipe 3 is laid from the starting shaft V to the target shaft, if the pressure medium supplied to the expansion tube 60 of the supporting device 4 is discharged, the expansion tube 60 contracts,
The diameter adjusting member 84 is separated from the inner surface of the embedded pipe 3, and the support fixing of the embedded pipe 3 and the support device 4 is released. When the support device 4 and the propulsion shaft body 2 are pulled out from the buried pipe 3, only the buried pipe 3 remains in the buried hole H of the ground E, and the construction of the buried pipe 3 is completed.

When changing the diameter of the buried pipe 3, the diameter adjusting member 84 mounted on the outer cover 80 of the supporting device 4 is used.
And loosen the bolt 87 to remove it. Then, the diameter adjusting member 8 prepared according to the pipe diameter of the buried pipe 3 to be constructed next
4. Specifically, after the diameter adjusting member 84 with the thickness of the adjusting block 85 changed is reattached to the outer cover 80, the same propulsion construction may be performed.

[0038]

As described above, according to the buried pipe supporting apparatus in the propulsion method according to the present invention, by using the spirally wound expansion tube, friction support is evenly carried out over the entire circumference of the buried pipe. With the advantage that the force can be applied and the pressure wiring equipment is simplified, by providing the diameter adjusting member as described above,
It becomes possible to easily cope with changes in the diameter of the buried pipe.

As a result, each time the diameter of the buried pipe changes,
Since the labor and cost for replacing the entire supporting device or preparing a plurality of supporting devices having different corresponding pipe diameters can be reduced, the work efficiency of the entire propulsion construction can be improved and the construction cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a mounting state of a supporting device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing the construction state of the propulsion method.

FIG. 3 is a sectional view in a direction orthogonal to FIG.

FIG. 4 is an enlarged sectional view showing a detailed structure around a diameter adjusting member.

FIG. 5 is an enlarged sectional view showing a state in which the buried pipe is supported.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead conductor 2 Propulsion shaft 3 Embedded pipe 4 Support device 50 Support cylinder 60 Expansion tube 70 Piping 80 Outer cover 84 Diameter adjustment member 85 Adjustment block

Claims (1)

[Claims] 1. A support device connected to the rear of a lead conductor for holding and fixing an embedded pipe on a propulsion shaft for transmitting a propulsive force to the lead conductor, the support device surrounding the outer periphery of the propulsion shaft and being arranged in a spiral shape. The expansion tube that expands to the outer peripheral side by supplying the pressure medium, the outer cover that covers the outer periphery of the expansion tube, and the outer peripheral of the outer cover are detachably attached and can move in the radial direction together with the outer cover. A support device for a buried pipe in a propulsion method, comprising: