JP2008069831A - Valve device for removing pipe connecting member from branch and method for removing the same - Google Patents

Abstract

A valve device for reducing the size of a valve device for removing a pipe connecting member from a branch portion of an existing tube in a state where the existing tube is in an uninterrupted flow, and capable of being removed even in a narrow work space. To provide.
A connecting portion between a branching portion and a pipe connecting member when the pipe connecting member attached to the branching portion of the existing pipe is removed while maintaining an uninterrupted flow state of the existing pipe. The valve device 23 includes sealing bodies 24, 25, and 26 that are attached so as to cover water tightly and 15, and a valve body 35 that is inserted between the branch portion 6 and the pipe connecting member 8. At least two valve bodies 35 are inserted between the branch section 6 and the pipe connection member 8 from both sides in the radial direction of the branch section 6 and the pipe connection member 8, and the valve bodies 35 contact each other. By being in contact with each other, the inside of the sealing bodies 24, 25, and 26 is partitioned, and water flow from the branch portion 6 to the pipe connecting member 8 side is stopped.
[Selection] Figure 9

Description

  The present invention relates to a valve device for removing pipe connection members such as pipe joints, valves, and air valves attached to a branch portion of an existing pipe from the branch portion while maintaining an uninterrupted flow state of the existing pipe, and a method for removing the same. About.

  Conventionally, when a pipe connection member such as an air valve or a repair valve connected to a branch portion of an existing pipe via a flange or the like is removed from the branch portion, the pipe connection member can be removed while maintaining an uninterrupted flow state of the existing pipe. In addition, the branch part and the pipe connection member are watertightly covered with a sealed case having a work valve, the branch part and the pipe connection member are separated from each other in the sealed case, and the work valve is provided between the branch part and the pipe connection member. The inside of the sealed case is inserted and the tube connecting member is removed (see Patent Document 1).

Japanese Patent No. 3533276 (page 3, FIG. 3)

  However, in the sealing case (sealing body) described in Patent Document 1, one work valve (valve body) is provided in a state of protruding to one side of the sealing case, and the protruding length is Since it becomes long, a sealing case will enlarge, and there exists a problem that it cannot use for the removal operation | work of the pipe connection member installed in the manhole etc. in which the wide working space is not ensured around a branch part.

  The present invention has been made paying attention to such a problem, and it is possible to reduce the size of the valve device for removing the pipe connecting member from the branch portion of the existing pipe in a state where the existing pipe is in an uninterrupted state, and it is narrow. It is an object of the present invention to provide a valve device and a pipe connecting member removing method that can be removed even in a work space.

In order to solve the above-described problem, a valve device according to claim 1 of the present invention provides:
Seal that attaches so that the connecting part between the branch part and the pipe connecting member is covered in a watertight manner when the pipe connecting member attached to the branch part of the existing pipe is removed while maintaining the uninterrupted flow state of the existing pipe. A valve device comprising: a body; a separating means that separates the branch portion and the pipe connecting member; and a valve body that is inserted between the separated branch portion and the pipe connecting member.
At least two valve bodies are provided, and each valve body is inserted between the branch portion and the pipe connection member from both sides in the radial direction of the branch portion and the pipe connection member. Are brought into contact with each other to partition the sealed body and stop water flow from the branch portion to the pipe connecting member side.
According to this feature, the protruding length of each valve body protruding in the radial direction of the branch portion and the pipe connecting member can be shortened, the valve device can be downsized, and the valve body Since the protruding length is short, a valve device can be attached to the connecting portion between the branch portion and the pipe connecting member even in a narrow work space, and the pipe connecting member can be removed from the branch portion while maintaining the uninterrupted flow state of the existing pipe.

A valve device according to claim 2 of the present invention is the valve device according to claim 1,
The sealing body is formed with a slit hole into which the valve body can be inserted while maintaining a watertight state in the sealed body, and before the valve body is inserted between the branch portion and the pipe connecting member. The valve body protrudes to the outside of the sealing body, and after the valve body is inserted, the valve body is housed inside the sealing body.
According to this feature, it is not necessary to form a sealing body so as to cover the valve body by forming a slit hole into which the valve body can be inserted while maintaining a watertight state in the sealed body, and the valve body is branched. After being inserted between the pipe connecting member and the pipe connecting member, a wide space is secured around the sealing body, and the pipe connecting member can be easily detached even in a narrow working space.

The valve device according to claim 3 of the present invention is the valve device according to claim 1 or 2,
The sealing body can be divided into at least two in the radial direction of the branch portion and the pipe connecting member.
According to this feature, the sealed body can be attached to the branch portion and the pipe connecting member in a divided state, and the mounting work of the sealed body can be easily performed even in a narrow work space.

A valve device according to a fourth aspect of the present invention is the valve device according to any one of the first to third aspects,
The sealing body includes an upper water stop plate attached to a flange provided on the pipe connecting member, a lower water stop plate attached to a flange provided on the branch portion, the upper water stop plate, and the lower water stop. It is characterized by being comprised by the case body which is arrange | positioned between plates and the said valve body was provided.
According to this feature, the sealing body can be disassembled into an upper water blocking plate, a lower water blocking plate, and a case body, so that the sealing body can be easily carried in even in a narrow working space, and both flanges can be separately provided. Since it can attach to a sealing body, it becomes easy to perform the attachment operation | work of a sealing body.

A valve device according to a fifth aspect of the present invention is the valve device according to any one of the first to fourth aspects,
The separation means includes a socket member that watertightly covers a screwing member for connecting the branch portion and the pipe connecting member, and the screwing is performed on the socket member while maintaining the watertight state. An operation unit for rotating the member is provided.
According to this feature, while the screwing member is covered with the socket member in a watertight manner, the screwing member is rotated to release the connection state between the branching portion and the pipe connecting member, and the branching portion and the pipe connecting member are separated from each other. Can be made.

A valve device according to a sixth aspect of the present invention is the valve device according to any one of the first to fifth aspects,
The contact portion between the two valve bodies is provided with a water-stop packing that is bent toward the branch portion.
According to this feature, the water stop packing is pressed to the valve body side by the water pressure applied to the surface of the bifurcation portion of the water stop packing, so that the water stop packing does not shift due to the water pressure and the two valve bodies come into contact with each other. Water can be prevented from flowing out between the parts.

The method for removing the pipe connecting member according to claim 7 of the present invention is as follows.
A method for removing a pipe connection member, wherein the removal of the pipe connection member attached to the branch portion of the existing pipe is performed while maintaining the uninterrupted flow state of the existing pipe,
Attaching a sealing body including at least two valve bodies so as to cover the connecting portion between the branch portion and the pipe connecting member in a watertight manner;
Separating the branch portion and the pipe connecting member;
The valve bodies are inserted between the separated branch section and the pipe connection member from both sides in the radial direction of the branch section and the pipe connection member, and the valve bodies are brought into contact with each other. A step of partitioning the sealed body and stopping the water flow from the branch portion to the pipe connecting member side;
Removing the pipe connecting member from the branch part in a state where the branch part is stopped,
It is characterized by including.
According to this feature, by inserting at least two valve bodies from both sides in the radial direction of the branch portion and the pipe connection member, the insertion time of the valve body can be shortened, and the branch portion is moved to the pipe connection member side. Since the process of stopping the flow of air can be performed in a short time and the length of each valve body protruding from the sealing body can be made short, it is easy to work even in a narrow work space, and the existing pipe is in an undisturbed state The pipe connecting member can be removed from the branch portion while maintaining the above.

The method for removing a pipe connecting member according to claim 8 of the present invention is the method for removing a pipe connecting member according to claim 7,
A screwing member for connecting the branch portion and the pipe connecting member is loosened, and the branch portion and the pipe connecting member are separated using water pressure applied from the branch portion side.
According to this feature, there is no need to provide a power mechanism or the like for separating the branch part and the pipe connection member, and only by loosening the screwing member for connecting the branch part and the pipe connection member, The branch portion and the pipe connecting member can be separated by the water pressure applied from the branch portion side, and the separation work can be easily performed.

  Examples of the present invention will be described below.

  An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a front view showing a state in which a sub-valve is attached to a branch connection pipe of an existing pipe buried in the ground, and FIG. 3 is a front view showing a state in which the knife gate device is attached, FIG. 3 is a partially longitudinal front view showing a state in which the top device is attached to the branch connection pipe, and FIG. FIG. 5 is a plan view showing the knife gate device, FIG. 6 is a plan view showing the lower water stop plate, and FIG. 7 shows a state where the upper water stop plate is attached to the flange. FIG. 8 is a partially longitudinal front view showing a state in which the knife gate device is attached to the flange, and FIG. 9 is a partially longitudinal front view showing a state in which the lower water blocking plate is attached to the flange. FIG. 10 shows a closed valve body of the knife gate device. FIG. 11 is a partially vertical front view showing a state where the placing piece device is attached to the branch connection pipe, and FIG. 12 is a state where the branch connecting pipe is closed by the placing piece device. FIG. 4 is the front side (front side) of the upper water blocking plate, the lower side of FIG. 5 is the front side (front side) of the knife gate device, and the lower side of FIG. It demonstrates as the front side (front side) of a water plate.

  Reference numeral 1 in FIG. 1 is an existing pipe buried in the ground, and a work hole 3 (work space) surrounded by a concrete wall 2 is formed in the upper part of the existing pipe 1. In the upper part of the hole 3, a manhole hole 4 is formed for entering the operator and for carrying in the devices. The inner diameter of the working hole 3 gradually decreases as it goes upward, and the inner diameter of the manhole hole 4 is smaller than the inner diameter of the working hole 3.

  As shown in FIG. 1, a branch portion 5 is formed in the upper portion of the existing pipe 1, and a lid body 7 having a branch connection pipe 6 (branch portion) is attached to the branch portion 5. . A sub valve 8 as a pipe connecting member in this embodiment is attached to the upper end portion of the branch connection pipe 6, and an air valve 9 is attached to the upper end portion of the sub valve 8. In addition, the water stop packings 10 and 12 are disposed between the branch connection pipe 6, the sub valve 8, and the air valve 9 (see FIG. 7), and flanges 14, 15, 16 and 17 are connected by bolts 18 and 19 and nuts 20 and 21.

  The auxiliary valve 8 is provided with a handle 22 for opening and closing a valve body (not shown) provided in the auxiliary valve 8. If the auxiliary valve 8 is closed, the existing pipe 1 is continuously flowed. The air valve 9 can be replaced while maintaining the state. However, when the sub-valve 8 has deteriorated due to long-term use, it may be difficult to open and close the sub-valve 8. In this case, it is necessary to replace the sub-valve 8 itself.

  As shown in FIG. 2, when the sub-valve 8 is removed while maintaining the uninterrupted flow state of the existing pipe 1, both flanges 14, 15 provided on the branch connection pipe 6 and the sub-valve 8, That is, the valve device 23 is attached to the connecting portion between the branch connection pipe 6 and the sub valve 8. The valve device 23 includes an upper water stop plate 24, a knife gate device 25, and a lower water stop plate 26.

  As shown in FIG. 4, the upper water stop plate 24 has a shape in which a plate-like member having an annular shape in a plan view is divided into two in the radial direction, and at the ends of the upper water stop plates 24. A tightening portion 29 having an insertion hole 28 through which the bolt 27 can be inserted is provided, and the upper water blocking plates 24 are connected to each other by tightening the tightening portions 29 with the bolt 27 and the nut 30.

  The upper water blocking plate 24 connected in an annular shape is formed with an insertion hole 31 through which an embedded bolt 41 provided in a knife gate device 25 described later is inserted on the upper surface thereof. On the inner side in the direction, a pressing piece 32 that presses a cap nut 60, which will be described later, against the flange 15 side of the sub-valve 8, protrudes inward. A drooping piece 33 projecting downward is formed on the lower surface side of the upper water blocking plate 24 (see FIG. 9).

  As shown in FIG. 5, the knife gate device 25 includes a case body 34 and a valve body 35. The case body 34 has a structure in which a plate-like member having a rectangular shape in plan view is divided into two in the left-right direction, and an insertion hole through which a bolt 36 can be inserted into each end portion of both the case bodies 34 A tightening portion 38 formed with 37 is provided, and the case portions 34 are connected to each other by tightening the tightening portions 38 with bolts 36 and nuts 39.

  The case body 34 is formed with a semicircular cutout portion 40, and the curved shape of the inner periphery of the cutout portion 40 is the both flanges formed in the branch connection pipe 6 and the subvalve 8 described above. 14 and 15 are substantially complementary to the curved shape of the outer periphery. Since the case bodies 34 are connected to each other, the cutout portion 40 forms a circular hole having the same size as the flanges 14 and 15.

  On the upper surface of the case body 34, embedded bolts 41 that are inserted into the insertion holes 31 of the upper water blocking plate 24 are provided. The embedded bolt 41 of the case body 34 is inserted into the insertion hole 31 of the upper water blocking plate 24, and the nut 42 is screwed to the tip of the embedded bolt 41, so that the case body 34 and the upper water blocking plate 24 are inserted. Are connected to each other (see FIG. 9).

  Moreover, the nut part 43 with which the volt | bolt 54 penetrated by the insertion hole 55 of the lower water blocking plate 26 mentioned later is screwed is formed in the lower surface of the case body 34 (refer FIG. 9). Further, a valve shaft 44 having a male screw is provided at the front and rear positions on the side surface of each case body 34, and a slit hole penetrating to the side of the notch 40 is provided on the side surface of the case body 34. 45 is opened (see FIG. 9). A valve body 35 having a rectangular shape in plan view is disposed between the front and rear valve shafts 44.

  As shown in FIG. 5, the inner end portion (contact portion) of the valve body 35 is inserted into a slit hole 45 formed in the case body 34 and branched and connected so as to form a substantially L shape in a sectional view. A water-stop packing 46 that is bent toward the tube 6 is provided (see a partially enlarged view of FIG. 10). A bent piece 47 extending in the front-rear direction is provided at the outer end portion of the valve body 35, and an insertion hole (not shown) is formed at the front-rear position of the bent piece 47, and this insertion hole (not shown). With the valve shaft 44 inserted therethrough, an operation nut 48 is screwed onto the tip of the valve shaft 44.

  When the operator tightens the operation nut 48, the operation nut 48 is moved to the base side along the valve shaft 44, and the bent piece 47 is pressed by the operation nut 48, so that the valve body 35 is inserted into the slit hole 45. It is designed to move to the inside. Furthermore, the operator loosens the operation nut 48 and moves it to the tip end portion of the valve shaft 44, and rotates the operation nut 48 ′ provided at the base portion of the valve shaft 44 to move toward the tip end portion side of the valve shaft 44. By moving it, the valve body 35 can be pulled out to the outside of the slit hole 45. Further, as shown in FIG. 9, a water stop packing 49 is provided at the opening in which the valve body 35 is inserted in the slit hole 45 so as to sandwich the valve body 35 from above and below and from the front and rear. The valve body 35 can be inserted while maintaining the inside of the slit hole 45 in a watertight state.

  As shown in FIG. 6, the lower water stop plate 26 has a shape in which a plate-like member having an annular shape in a plan view is divided into two in the radial direction, and at the end of the lower water stop plates 26. Is provided with an embedded bolt 50 and a tightening portion 52 in which an insertion hole 51 into which the embedded bolt 50 can be inserted is formed. The tightening portions 52 are tightened with the embedded bolt 50 and the nut 53. Thus, the lower water blocking plates 26 are connected to each other.

  The lower water blocking plate 26 connected in an annular shape is formed with an insertion hole 55 through which the bolt 54 screwed into the nut portion 43 of the case body 34 is inserted. A bolt 54 is inserted from below into the insertion hole 55 of the lower water blocking plate 26, and the bolt 54 is screwed into the nut portion 43 of the case body 34, thereby connecting the lower water blocking plate 26 and the case body 34 to each other. (See FIG. 9). The upper water blocking plate 24, the case body 34, and the lower water blocking plate 26 are connected to each other so as to constitute the sealing body in this embodiment.

  Further, the lower water blocking plate 26 is covered with a bolt head of a work bolt 59 (screwing member) attached to the flange 14 of the branch connection pipe 6 to be described later, and is rotated in a state of being fitted to the bolt head. A socket member 56 as a separating means in the present embodiment is attached (see FIG. 9). The upper side of the socket member 56 is exposed on the upper surface side of the lower water blocking plate 26, and the operator rotates the socket member 56 by fitting a spanner or the like to the lower end of the socket member 56. An operation unit 57 is provided. Further, the socket member 56 is provided with a push-up pin 58. The push-up pin 58 can be moved in the vertical direction while keeping the inside of the socket member 56 watertight.

  Next, an example of use of the valve device 23 when removing the auxiliary valve 8 attached to the branch connection pipe 6 while maintaining the uninterrupted flow state of the existing pipe 1 will be described. First, as shown in FIG. 7, a plurality of sets of bolts 18 and nuts 20 connecting the flange 15 of the sub-valve 8 and the flange 14 of the branch connection pipe 6 are replaced with working bolts 59 and cap nuts 60 one by one. (See Fig. 1). Since the bolts 18 and the nuts 20 are exchanged one by one, all the bolts 18 and the nuts 20 are replaced with the working bolts 59 and the cap nuts while preventing a large amount of water from flowing between the flanges 14 and 15. Can be exchanged for 60. Since the existing bolt 18 and nut 20 are difficult to rotate due to rust and the like due to long-term use, the work of removing the auxiliary valve 8 can be performed by replacing the work bolt 59 with the cap nut 60 anew. It becomes easy to do.

  The cap nut 60 is provided with a water stop packing 61 on the joint surface with the flange 15 of the auxiliary valve 8. Therefore, the tip end portion of the work bolt 59 and the insertion hole 62 of the flange 15 through which the work bolt 59 is inserted are covered with the cap nut 60 in a watertight manner. And the upper water stop plate 24 divided | segmented into two from the manhole hole 4 is carried in, and each upper water stop plate 24 is attached to the outer periphery of the flange 15 of the subvalve 8. FIG.

  The upper water blocking plate 24 is attached to a position where the pressing piece 32 is engaged with the cap nut 60, and the cap nut 60 is disposed in a state of being pressed against the upper surface of the flange 15 by the pressing piece 32 from above. Further, the drooping piece 33 formed on the lower surface side of the upper water blocking plate 24 is disposed so as to cover the outer peripheral surface of the flange 15. Further, the tightening portions 29 of the divided upper water blocking plate 24 are brought into contact with each other and connected by the bolt 27 and the nut 30. At this time, the water stop packing 64 is disposed between the inner peripheral surface of the hanging piece 33 of the upper water stop plate 24 and the outer peripheral end of the flange 15 of the sub valve 8. As will be described later, this water stop packing 64 prevents water leakage from between the upper water stop plate 24 and the flange 15.

  As shown in FIG. 8, the case body 34 of the knife gate device 25 is carried in from the manhole hole 4 in a state of being divided into two. The operator arranges the cutout portion 40 of the case body 34 so as to cover the outer periphery of the flanges 14 and 15, and the tightening portions 38 of the divided case body 34 are brought into contact with each other and are connected by the bolt 36 and the nut 39. Then, the embedded bolt 41 projecting from the upper surface of the case body 34 is inserted into the insertion hole 31 of the upper water blocking plate 24, and the nut 42 is screwed to the tip of the embedded bolt 41, whereby the case body 34 is connected to the upper water stop plate 24 in a suspended state.

  Next, the two valve bodies 35 are carried from the manhole holes 4, and the valve bodies 35 are inserted into the case bodies 34 from the slit holes 45 opened on the side surfaces of the respective case bodies 34, and The valve shaft 44 is inserted into an insertion hole (not shown) provided in the bent piece 47 at the end, and the operation nut 48 is screwed into the tip of the valve shaft 44. The inner end portion of the valve body 35 inserted into the slit hole 45 is in contact with the hanging piece 33 of the upper water stop plate 24. By carrying in the case body 34 and the valve body 35 separately from the manhole hole 4, it is easy to carry in the knife gate device 25.

  As shown in FIG. 9, the lower water stop plate 26 in a state of being divided into two is carried from the manhole hole 4 and attached to the flange 14 of the branch connection pipe 6 from below, and the divided lower water stop plate 26 of the divided lower water stop plate 26. The tightening portions 52 are brought into contact with each other and connected by the embedded bolt 50 and the nut 53. At this time, a water stop packing 65 is provided on the upper surface of the lower water stop plate 26, and the water stop packing 65 is brought into contact with the lower surface of the flange 14 of the branch connection pipe 6. The water stop packing 65 prevents water leakage from between the lower water stop plate 26 and the flange 14 as will be described later. Furthermore, water-stopping packings 66 and 67 for preventing water leakage are also arranged between the upper water stop plate 24 and the case body 34 and between the case body 34 and the lower water stop plate 26.

  The lower water blocking plate 26 is attached at a position where the socket member 56 is fitted to the bolt head of the work bolt 59 attached to the flange 14 so that the socket member 56 covers the work bolt 59 in a watertight manner. . Then, the bolt 54 inserted through the insertion hole 55 of the lower water stop plate 26 is screwed into the nut portion 43 of the case body 34, so that the lower water stop plate 26 is suspended from the case body 34. Connected. In addition, a fixing jack 68 is provided between the lower surface of the lower water blocking plate 26 and the upper surface of the lid body 7, and the lower water blocking plate 26 does not move up and down by the fixing jack 68. Fixed to.

  As shown in FIG. 10, the worker turns the work bolt 59 by rotating a socket member 56 by fitting a spanner or the like into the operation portion 57 of the socket member 56 of the lower water blocking plate 26. Since the cap nut 60 is engaged with the pressing piece 32 of the upper water blocking plate 24, when the socket member 56 is rotated, the tip end portion of the work bolt 59 is removed from the cap nut 60. The work bolt 59 removed from the cap nut 60 falls to the lower part of the socket member 56.

  When the operation is interrupted in the middle of the operation or when a problem occurs in the mounting state of the valve device 23, the operation bolt 59 needs to be screwed into the cap nut 60 again. When the socket member 56 is rotated with the work bolt 59 moved upward by pushing the 58 upward, the tip of the work bolt 59 can be screwed back into the cap nut 60 again. ing.

  Next, when the nut 42 screwed into the embedded bolt 41 of the case body 34 is loosened, water begins to flow out between the branch connection pipe 6 and the auxiliary valve 8. The discharged water is filled in a region (sealed body) surrounded by the upper water stop plate 24, the case body 34, and the lower water stop plate 26, and the sub-valve is increased by the increase of the water pressure in the region. The eight flanges 15 are pushed upward, and the auxiliary valve 8 is separated from the branch connection pipe 6.

  As shown in FIG. 10, the upper water stop plate 24 is raised as the sub-valve 8 is raised, the inside of the slit hole 45 closed by the hanging piece 33 of the upper water stop plate 24 is opened, and the valve body 35 is opened. It can be inserted into the case body 34 from the slit hole 45. Then, in a state where a gap of a predetermined width is formed between the auxiliary valve 8 and the branch connection pipe 6, the operator rotates the operation nut 48 of the valve shaft 44 to move the valve body 35 on both the left and right sides (in the radial direction). ) To the inside of the case body 34.

  In addition, the valve bodies 35 inserted into the case body 34 from the left and right directions come into contact with water-stopping packings 46 provided at the inner end portions (contact portions) (FIG. 10). (See partial enlarged view). The inside of the case body 34 is divided into two upper and lower parts by the two valve bodies 35 on the side of the sub valve 8 and the side of the branch connection pipe 6, and the water flow from the branch connection pipe 6 to the side of the sub valve 8 is stopped. It is done.

  As shown in FIG. 11, in a state where the branch connection pipe 6 is water-stopped, the nut 42 screwed to the embedded bolt 41 of the case body 34 is removed, and the upper waterstop plate 24 is removed from the case body 34. Then, the air valve 9 and the auxiliary valve 8 are removed. Then, the placing piece device 70 surrounded by the sealing case 69 is attached to the case body 34.

  As shown in FIGS. 3 and 11, the placing sesame apparatus 70 is covered with a sealing case 69 in a watertight manner, and the sealing case 69 has a mating flange 71 connected to the embedded bolt 41 at the lower end thereof. Yes. The sealing case 69 is attached to the case body 34 through the mating flange 71. The region surrounded by the case body 34, the mating flange 71, and the sealing case 69 is hermetically sealed.

  The placing piece device 70 includes a claw extension shaft 73 connected to the spindle 72, a fixed shaft 75 connected to the sleeve 74, and a ratchet wrench 77 connected to the case pipe 76. The spindle 72 is connected to the placing frame claw 78, and the sleeve 74 is connected to a pressing body 80 that presses the placing frame rubber 79. The operator can operate the placement piece rubber 79 and the placement piece claw 78 by operating the claw extension shaft 73, the fixed shaft 75, and the ratchet wrench 77.

  Next, both valve bodies 35 of the knife gate device 25 are opened apart from each other in the left-right direction by loosening the operation nut 48 of the valve shaft 44. The water flowing out from the branch connection pipe 6 flows into the sealed case 69, but the region surrounded by the case body 34 and the mating flange 71 and the sealed case 69 is sealed in a watertight manner so that it does not flow out to the outside. It has become. Then, the placing piece rubber 79 of the placing piece device 70 is inserted into the branch connection pipe 6.

  After the placement frame rubber 79 is inserted into the branch connection pipe 6, when the placement frame claw 78 is expanded by rotating the claw extension shaft 73, the placement frame claw 78 is locked to the inner surface of the lid body 7. (See FIG. 12). If the fixing shaft 75 is rotated while fixing the ratchet wrench 77 while the claw 78 for placing pieces is locked to the lid body 7, the pressing body 80 is lowered downward, and the pressing body 80 and the support body 81 The placing piece rubber 79 sandwiched therebetween swells in the radial direction, and the branch connecting pipe 6 is closed by the placing piece rubber 79.

  As shown in FIG. 12, the knife gate device 25 and the lower water blocking plate 26 are removed from the branch connection pipe 6 after the branch connection pipe 6 is closed by the placing piece rubber 79. Note that the claw extension shaft 73, the fixed shaft 75, and the ratchet wrench 77 are detachable. By removing the extension claw 73, the fixed shaft 75, and the ratchet wrench 77, the sealing case 69 is moved upward to place it. It can be removed from the device 70. A new sub valve 8 and air valve 9 can be attached to the branch connection pipe 6.

  As described above, according to the valve device 23 of the present embodiment, at least two valve bodies 35 are provided, and each valve body 35 branches from both sides in the radial direction (left-right direction) of the branch connection pipe 6 and the sub valve 8. Inserted between the connecting pipe 6 and the sub-valve 8 and the valve bodies 35 abut against each other, thereby partitioning the inside of the valve device 23 and stopping the water flow from the branch connecting pipe 6 to the sub-valve 8 side. It is like that. Therefore, the projecting length of each valve body 35 projecting to the left and right sides of the valve device 23 can be shortened, the valve device 23 can be downsized, and the projecting length of the valve body 35 is short. The valve device 23 is attached to the flanges 14 and 15 of the branch connection pipe 6 and the auxiliary valve 8 even in a narrow work space such as the inside of the service hole 3, and the auxiliary valve 8 is branched while maintaining the uninterrupted flow state of the existing pipe 1. It can be removed from the connecting pipe 6.

  Further, the case body 34 is formed with a slit hole 45 into which the valve body 35 can be inserted while maintaining the watertight state in the case body 34, and the valve body 35 is provided between the branch connection pipe 6 and the sub-valve 8. The valve body 35 protrudes outside the case body 34 before being inserted into the case body. After the valve body 35 is inserted, the valve body 35 is housed inside the case body 34 so that the valve body 35 is accommodated. In addition to eliminating the need to form the case body 34 so as to cover the entire body 35, a wide space is secured around the case body 34 after the valve body 35 is inserted between the branch connection pipe 6 and the auxiliary valve 8. As a result, even in a narrow work space such as the inside of the work hole 3, it is easy to remove the auxiliary valve 8.

  Further, the upper water stop plate 24, the case body 34, and the lower water stop plate 26 can be divided into at least two portions in the radial direction (left and right direction) of the branch connection pipe 6 and the auxiliary valve 8, respectively. The water stop plate 24, the case body 34, and the lower water stop plate 26 are divided and attached to the branch connection pipe 6 and the sub-valve 8. The attachment work of the apparatus 23 can be performed simply.

  Moreover, the upper water stop plate 24 attached to the flange 15 provided in the sub valve 8, the lower water stop plate 26 attached to the flange 14 provided in the branch connection pipe 6, the upper water stop plate 24, and the lower water stop A valve device 23 (sealing body) that is disposed between the plate 26 and the case body 34 provided with the valve body 35 is hermetically sealed. The plate 24, the lower water stop plate 26, and the case body 34 can be disassembled, and the valve device 23 can be easily carried in a narrow work space such as the inside of the work hole 3, and the upper water stop plate 24 Since the lower water stop plate 26 and the case body 34 can be separately attached to both the flanges 14 and 15, the valve device 23 can be easily attached. Since the loading operation can be performed with the valve device 23 disassembled, the valve device 23 can be loaded from the manhole hole 4 having an inner diameter smaller than the inner diameter of the working hole 3.

  The separating means for separating the branch connection pipe 6 and the sub-valve 8 includes a socket member 56 that covers the work bolt 59 for connecting the branch connection pipe 6 and the sub-valve 8 in a watertight manner. The member 56 is provided with an operation portion 57 for rotating the work bolt 59 while maintaining a watertight state, so that the work bolt 59 can be rotated while the work bolt 59 is covered with the socket member 56 in a watertight manner. Thus, the connection state between the branch connection pipe 6 and the sub-valve 8 can be released, and the branch connection pipe 6 and the sub-valve 8 can be separated by the water pressure applied from the branch connection pipe 6.

  In addition, the abutment portion between the left and right valve bodies 35 is provided with a water-stop packing 46 that is bent toward the branch connecting pipe 6 so as to form a substantially L shape in cross-sectional view. The water stop packing 46 is pressed against the valve body 35 by the water pressure applied to the surface of the branch connection pipe 6 side of 46, so that the water stop packing 46 does not shift due to the water pressure, and the abutting portion between the two valve bodies 35 It is possible to prevent water from flowing out from between.

  Furthermore, according to the method of removing the auxiliary valve 8 (pipe connecting member) of the present embodiment, the valve device 23 (sealed body) including at least two valve bodies 35 is connected to the flange between the branch connecting pipe 6 and the auxiliary valve 8. 14 and 15 so as to be covered watertight, the step of separating the branch connection pipe 6 and the subvalve 8, and both valve bodies 35 between the separated branch connection pipe 6 and the subvalve 8. The valve device 23 is partitioned by inserting the branch connection pipe 6 and the sub valve 8 from both the left and right sides in the radial direction, and the valve bodies 35 are brought into contact with each other, so that the branch connection pipe 6 is connected to the sub valve 8 side. By including the step of stopping the water flow and the step of removing the sub valve 8 from the branch connection pipe 6 in a state where the branch connection pipe 6 is stopped, both the left and right sides in the radial direction of the branch connection pipe 6 and the sub valve 8 are included. The operation of inserting at least two valve bodies 35 from can be performed, the insertion time of the valve body 35 can be shortened, Since the process of stopping the flow from the manifold 6 to the sub-valve 8 can be performed in a short time, and the protruding length of each valve body 35 from the case body 34 can be formed short, the inside of the work hole 3 etc. The sub-valve 8 can be removed from the branch connection pipe 6 while maintaining the uninterrupted flow state of the existing pipe 1 even in a narrow work space.

  Further, the work bolt 59 for connecting the branch connection pipe 6 and the sub-valve 8 is loosened, and the branch connection pipe 6 and the sub-valve 8 are separated from each other by utilizing the water pressure applied from the branch connection pipe 6 side. There is no need to provide a power mechanism or the like for separating the connection pipe 6 and the auxiliary valve 8, and the branch connection pipe can be obtained simply by loosening the work bolt 59 for connecting the branch connection pipe 6 and the auxiliary valve 8. The branch connection pipe 6 and the sub-valve 8 can be separated by water pressure applied from the 6 side, and the separation work can be easily performed.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the embodiment, two valve bodies 35 are provided in the valve device 23, and each valve body 35 is inserted into the case body 34 from the slit hole 45 formed on the left and right side surfaces of the case body 34. The water flow from the branch connection pipe 6 to the sub-valve 8 side is stopped, but the number of the valve elements 35 is not limited to two, and three, four, or more valve elements may be provided. By closing the branch connection pipe 6 with a plurality of valve bodies, the size of one valve body 35 can be reduced, and the valve device 23 can be downsized.

It is a front view which shows the state by which the subvalve was attached to the branch connection pipe of the existing pipe embed | buried in the ground. It is a front view which shows the state in which the knife gate apparatus was attached to the flange. It is a partial longitudinal cross-sectional front view which shows the state in which the placing piece apparatus was attached to the branch connection pipe. It is a top view which shows an upper water stop board. It is a top view which shows a knife gate apparatus. It is a top view which shows a lower water stop board. It is a partial vertical front view which shows the state which attached the upper water stop board to the flange. It is a partial vertical front view which shows the state which attached the knife gate apparatus to the flange. It is a partial vertical front view which shows the state which attached the lower water stop board to the flange. It is a partial vertical front view which shows the state which closed the valve body of the knife gate apparatus. It is a partial longitudinal cross-sectional front view which shows the state which attached the placing frame apparatus to the branch connection pipe. It is a vertical front view which shows the state which obstruct | occluded the branch connection pipe | tube with the placing piece apparatus.

Explanation of symbols

1 Existing pipe 2 Concrete wall 3 Work hole (work space)
4 Manhole hole 5 Branch 6 Branch connection pipe (branch)
7 Lid 8 Sub valve (Pipe connecting member)
9 Pneumatic valves 10, 12 Water-stop packing 14, 15 Flange (connecting part)
16, 17 Flange 18, 19 Bolt 20, 21 Nut 22 Handle 23 Valve device 24 Upper water stop plate (part of sealed body)
25 Knife gate device 26 Lower water stop plate (part of sealed body)
27 Bolt 28 Insertion hole 29 Tightening portion 30 Nut 31 Insertion hole 32 Pressing piece 33 Suspended piece 34 Case body (part of sealed body)
35 Valve body 36 Bolt 37 Insertion hole 38 Tightening part 39 Nut 40 Notch part 41 Embedded bolt 42 Nut 43 Nut part 44 Valve shaft 45 Slit hole 46 Water stop packing 47 Bending piece 48, 48 'Operation nut 49 Water stop packing 50 Bolt 51 Insertion hole 52 Tightening portion 53 Nut 54 Bolt 55 Insertion hole 56 Socket member (separating means)
57 Operation part 58 Push-up pin 59 Working bolt (screwing member)
60 Cap nut 61 Water stop packing 62 Insertion hole 64, 65 Water stop packing 66, 67 Water stop packing 68 Fixing jack 69 Sealing case 70 Place piece device 71 Fitting flange 72 Spindle 73 Claw expansion shaft 74 Sleeve 75 Fixed shaft 76 Case pipe 77 Ratchet Wrench 78 Placement Claw 79 Placement Rubber 80 Pressing Body 81 Supporting Body

Claims (8)

Seal that attaches so that the connecting part between the branch part and the pipe connecting member is covered in a watertight manner when the pipe connecting member attached to the branch part of the existing pipe is removed while maintaining the uninterrupted flow state of the existing pipe. A valve device comprising: a body; a separating means that separates the branch portion and the pipe connecting member; and a valve body that is inserted between the separated branch portion and the pipe connecting member.
At least two valve bodies are provided, and each valve body is inserted between the branch portion and the pipe connection member from both sides in the radial direction of the branch portion and the pipe connection member. The valve device is characterized in that the sealed body is partitioned by being brought into contact with each other, and water flow from the branch portion to the pipe connecting member side is stopped.   The sealing body is formed with a slit hole into which the valve body can be inserted while maintaining a watertight state in the sealed body, and before the valve body is inserted between the branch portion and the pipe connecting member. The valve device according to claim 1, wherein the valve body protrudes outside the sealing body, and the valve body is housed inside the sealing body after the valve body is inserted.   The valve device according to claim 1 or 2, wherein the sealing body can be divided into at least two in the radial direction of the branch portion and the pipe connecting member.   The sealing body includes an upper water stop plate attached to a flange provided on the pipe connecting member, a lower water stop plate attached to a flange provided on the branch portion, the upper water stop plate, and the lower water stop. The valve device according to any one of claims 1 to 3, wherein the valve device is configured with a case body arranged between the plate and the valve body.   The separation means includes a socket member that watertightly covers a screwing member for connecting the branch portion and the pipe connecting member, and the screwing is performed on the socket member while maintaining the watertight state. The valve device according to any one of claims 1 to 4, further comprising an operation unit that rotates the member.   The valve device according to any one of claims 1 to 5, wherein the contact portion between the two valve bodies is provided with a water-stopping packing bent toward the branch portion. A method for removing a pipe connection member, wherein the removal of the pipe connection member attached to the branch portion of the existing pipe is performed while maintaining the uninterrupted flow state of the existing pipe,
Attaching a sealing body including at least two valve bodies so as to cover the connecting portion between the branch portion and the pipe connecting member in a watertight manner;
Separating the branch portion and the pipe connecting member;
The valve bodies are inserted between the separated branch section and the pipe connection member from both sides in the radial direction of the branch section and the pipe connection member, and the valve bodies are brought into contact with each other. A step of partitioning the sealed body and stopping the water flow from the branch portion to the pipe connecting member side;
Removing the pipe connecting member from the branch part in a state where the branch part is stopped,
A method for removing a pipe connecting member, comprising:   The pipe according to claim 7, wherein a screwing member for connecting the branch part and the pipe connection member is loosened, and the branch part and the pipe connection member are separated from each other by using water pressure applied from the branch part side. How to remove the connecting member.

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