Watertight test method and joint fixture

Abstract

A watertight test method for joining one end of a second tube (3) to a first tube (2) and performing a watertight test on a joined portion (4), wherein a test device body (21) is inserted into the first tube (2), a joining fixture (80) is installed at the other end of the second tube (3), a pulling device (82a) is installed on the joining fixture (80) and connected to a cable body (112a) pre-wound around the outer circumference of the first tube (2), and the cable body (112a) is pulled toward the second tube (3) by operating the pulling device (82a). The test device (21) is configured to stretch the test tube (3) in the direction of separation, and utilize the reaction force generated in the second tube (3) to pull the second tube (3) in the direction of engagement (G) so that one end of the second tube (3) is inserted into the first tube (2), and the second tube (3) is engaged with the first tube (2). In the state where the second tube (3) is pulled in the direction of engagement (G), a moving operating rod (22) provided on the test device body (21) is operated from the outside of the other end of the second tube (3) to move the test device body (21) toward the engagement portion (4).

Description

Technical Field

[0001] The present invention relates to a watertightness test method for a joint portion of a pipe and a joint jig used in the watertightness test method. Background Art

[0002] Conventionally, as a method for such a watertight test, there is a method of using Fig.16 The method of the watertight test device 201 shown in the figure. That is, the watertight test device 201 comprises: a test device body 205 for performing a watertight test of a joint 204 between the pipes 202 and 203 in the pipes 202 and 203; and a moving operation rod 206 for moving the test device body 205 in the pipe 202 and 203 in the pipe axial direction B.

[0003] The test device body 205 has a cylindrical member 207 and a pair of annular water-stopping bags 208 that can be expanded and provided on the cylindrical member 207. An annular sealed space 209 is formed at the joint portion 204, and the sealed space 209 is surrounded by the outer circumference of the cylindrical member 207 and the inner circumference of the two tubes 202, 203, and the two water-stopping bags 208 that are expanded and water-stopped.

[0004] The test device main body 205 supplies water 210 for a water pressure test to fill the sealed space 209 and applies water pressure to thereby check for water leakage from the elastic seal 211 of the joint portion 204 .

[0005] The movement operation rod 206 is attached to the cylindrical member 207 of the test device main body 205 and extends along the tube axis direction B.

[0006] Thus, after the second tube 203 is joined to the first tube 202, the moving operating rod 206 is operated to move the test device body 205 to the joint portion 204. Then, the diameters of the two water-stopping bags 208 are expanded, and water 210 for a water pressure test is supplied and filled into the sealed space 209, and water pressure is applied to check for water leakage from the elastic seal 211 of the joint portion 204.

[0007] The watertight test device 201 described above is described in Japanese Patent Application Laid-Open No. 2013-40866. Summary of the invention

[0008] Problem that the invention aims to solve

[0009] However, in the above-mentioned conventional form, when performing a watertight test, the second tube 203 is pushed in the escape direction H due to the water pressure acting in the annular sealed space 209 , and the second tube 203 may escape from the first tube 202 .

[0010] An object of the present invention is to provide a watertight test method and a joining jig capable of preventing a second pipe from coming out of a first pipe during a watertight test.

[0011] Means of solving the problem

[0012] The watertightness test method of the present invention is characterized in that one end of the second pipe is joined to the first pipe and a watertightness test of the joined portion is performed.

[0013] Inserting a test device body of a watertight test device for performing a watertight test in a pipe into the first pipe,

[0014] Install a joining fixture on the other end of the second pipe.

[0015] The pulling device is mounted on the joining jig and connected to the cable body pre-wound around the outer periphery of the first tube.

[0016] The pulling device is operated to stretch the cable body in the disengagement direction of the second tube, thereby utilizing the reaction force generated on the second tube to pull the second tube in the joining direction and insert one end of the second tube into the end of the first tube, so that the one end of the second tube is joined to the first tube. While the second tube is pulled in the joining direction, the moving operating rod provided on the test device body is operated from the outside of the other end of the second tube to move the test device body to the joining portion in the tube, so as to perform a watertight test on the joining portion.

[0017] Thus, after the second tube is joined to the first tube, the test device body is used to perform a watertight test of the joined portion while the second tube is pulled in the joining direction. Therefore, during the watertight test, the second tube is restrained by the first tube in the tube axis direction via the joining jig, the pulling device, and the cable body. Thus, the second tube can be prevented from coming off the first tube.

[0018] According to the watertight test method of the present invention, it is preferred that when the moving operating rod is operated from the outside of the other end of the second tube and the test device body is moved to the joining portion inside the tube, the moving operating rod is pulled out from the other end of the second tube to the outside without interfering with the joining clamp through a passage space ensured in the central portion of the other end of the second tube.

[0019] Thus, when the moving operating rod is operated from the outside of the other end of the second pipe, the moving operating rod does not interfere with the joining jig, and thus the moving operating rod can be easily pulled out from the other end of the second pipe.

[0020] The joining jig used in the watertightness test method of the present invention is characterized in that:

[0021] The second tube has a detachable frame body and a mounting portion for mounting the pulling device on the frame body.

[0022] The mounting portion is arranged on the frame body,

[0023] The frame body can be mounted on the other end portion of the second pipe so as to be arranged around the passage space for pulling out the moving operation rod.

[0024] Thus, when the frame body is attached to the other end of the second pipe, a passage space is secured at the other end of the second pipe. Thus, the moving operation rod is pulled outward from the other end of the second pipe through the passage space without interfering with the joining jig.

[0025] According to the joining jig of the present invention, it is preferred that the mounting portion is arranged on the outside of the frame body in the pipe diameter direction.

[0026] The anti-dumping device is arranged on the frame body, and the anti-dumping device is used to prevent the frame body installed at the other end of the second pipe from tipping outward in the pipe diameter direction.

[0027] The tipping prevention device has a rolling body that can come into contact with a wall surface surrounding the pipe.

[0028] In this way, the frame body of the joining jig is mounted on the other end of the second pipe, and the pulling device is mounted on the mounting portion of the frame body, whereby the pulling device is disposed outside the frame body in the pipe diameter direction.

[0029] In this state, when the pulling device is operated to pull the cable body in the direction of separation from the second tube, an external force in the tube diameter direction acts on the frame body. With respect to such external force, the rolling body of the anti-dumping device abuts against the wall surface, and the frame body is supported on the wall surface side by the anti-dumping device. Thus, the frame body can be prevented from tipping outward in the tube diameter direction.

[0030] When the second tube is joined to the first tube, as the second tube moves in the joining direction, the rolling element of the tilting prevention device rolls in the joining direction while abutting against the wall surface, so the joining jig moves smoothly in the joining direction integrally with the second tube.

[0031] According to the joining jig of the present invention, it is preferable that the falling prevention device has a position adjustment unit that moves the position of the rolling element in the pipe diameter direction.

[0032] Thus, by moving the position of the rolling element in the tube diameter direction according to the position of the wall surface, the rolling element can be reliably brought into contact with the wall surface.

[0033] Effects of the Invention

[0034] As described above, according to the present invention, after the second tube is joined to the first tube, the watertightness test of the joined portion is performed using the test device body while the second tube is pulled in the joining direction. Therefore, during the watertightness test, the second tube is restrained by the first tube in the tube axis direction via the joining jig, the pulling device, and the cable body. Thus, the second tube can be prevented from coming out of the first tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a cross-sectional view of a test device body of the watertight test device used in the watertight test method according to the first embodiment of the present invention, and shows a state in which the press-fitting of the first sealing member and the second sealing member is released.

[0036] Figure 2 It is a cross-sectional view of the test device body of the watertight test device, and shows a state in which the first sealing member and the second sealing member are pressed in.

[0037] Figure 3 yes Figure 1 XX direction view in.

[0038] Figure 4 It is a side view showing the steps of a watertight test method using the watertight test device.

[0039] Figure 5 It is a side view showing the steps of a watertight test method using the watertight test device.

[0040] Figure 6 It is a side view showing the steps of a watertight test method using the watertight test device.

[0041] Figure 7 It is a side view showing the steps of a watertight test method using the watertight test device.

[0042] Figure 8 yes Figure 6 XX direction view in.

[0043] Fig. 9 yes Figure 8 XX direction view in.

[0044] Fig.10 yes Fig. 9 XX direction view in.

[0045] Fig.11 This is a front view of one frame body of the joining jig used in the watertight test method.

[0046] Fig.12 This is a rear view of one frame body of the joining jig.

[0047] Fig.13It is a top view of one frame body of the joining jig.

[0048] Fig.14 It is a side view of one frame body of the joining jig.

[0049] Fig.15 It is a front view of the joining jig in the second embodiment.

[0050] Fig.16 This is a cross-sectional view for explaining a watertightness test method using a conventional watertightness test device. DETAILED DESCRIPTION

[0051] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0052] (First Embodiment)

[0053] In a first embodiment, if Figure 1 to Figure 3 1 is a watertight test device for conducting a watertight test on a joint portion 4 of pipes 2 and 3 after they are joined. The pipes 2 and 3 are PN-type pipes made of ductile iron and have an insertion port 6 at one end and a receiving port 7 at the other end. The pipes 2 and 3 are formed in an underground pipeline laying pit 9 (see FIG. Figure 4 ) is connected to form a pipeline 10 (refer to Figure 4 ) In addition, the pipes 2 and 3 are surrounded by the inner wall surface 9a of the pipe laying pit 9.

[0054] In the joint portion 4, the insertion port 6 of the second pipe 3 is inserted into the socket 7 of the first pipe 2 and joined. The socket 7 has a lock ring receiving groove 12 and a seal body mounting recess 13 formed on its inner peripheral surface.

[0055] A locking ring 15 for preventing disengagement is accommodated in the locking ring accommodating groove 12. In addition, a ring-shaped sealing body 16 made of an elastic material such as rubber is installed in the sealing body installation recess 13. The sealing body 16 is sandwiched between the outer peripheral surface of the insertion port 6 and the inner peripheral surface of the socket 7 and is compressed in the pipe diameter direction A. As a result, the insertion port 6 and the socket 7 are sealed.

[0056] like Figure 4 As shown, the watertight test device 1 includes a test device body 21 for performing a watertight test on the joint portion 4 in the pipes 2 and 3 and a moving operation rod 22 for moving the test device body 21 in the pipe axial direction B in the pipes 2 and 3 by remote operation.

[0057] Next, the test device main body 21 will be described.

[0058] like Figure 1 to Figure 3As shown, the test device body 21 includes a cylindrical core 25 , first and second sealing members 26 and 27 , first and second pressing members 29 and 30 , a moving device 32 , a test fluid supply device 33 , and a support device 34 .

[0059] The first sealing member 26 is an annular member made of an elastic material such as rubber, and seals between the outer peripheral surface of the core 25 and the inner peripheral surface of the second tube 3. In addition, the second sealing member 27 is an annular member made of an elastic material such as rubber, and seals between the outer peripheral surface of the core 25 and the inner peripheral surface of the first tube 2.

[0060] Engaging recessed portions 36 are formed over the entire circumference of the outer peripheral surfaces of the base end portions of the first sealing member 26 and the second sealing member 27 .

[0061] A first sealing member insertion space 37 is formed over the entire circumference between the outer circumference of the core 25 and the inner circumference of the second tube 3. A second sealing member insertion space 38 is formed over the entire circumference between the outer circumference of the core 25 and the inner circumference of the first tube 2.

[0062] The first press-fit member 29 is a member for press-fitting and compressing the first sealing member 26 into the first sealing member insertion space 37 , and has an engaging protrusion 40 formed over the entire circumference.

[0063] The second press-fit member 30 is a member that presses and compresses the second sealing member 27 into the second sealing member insertion space 38 , and has an engaging protrusion 40 similarly to the first press-fit member 29 .

[0064] The engaging protrusion 40 of the first press-fit member 29 is inserted into the engaging recess 36 of the first sealing member 26, thereby engaging the first sealing member 26 and the first press-fit member 29 in the tube axis direction B. In addition, the engaging protrusion 40 of the second press-fit member 30 is inserted into the engaging recess 36 of the second sealing member 27, thereby engaging the second sealing member 27 and the second press-fit member 30 in the tube axis direction B.

[0065] The moving device 32 moves the first pressing member 29 and the second pressing member 30 in the tube axis direction B in a pressing direction C (see Figure 2 ) and the mutually separated press-release direction D (refer to Figure 1 )Mobile device.

[0066] That is, the moving device 32 includes: a tubular movable rod 42 mounted on the second pressing member 30 and movable in the tube axis direction B; a receiving member 43 provided at the front end of the movable rod 42; and a plurality of double-acting jacks 44 that can be extended and retracted in the tube axis direction B. The double-acting jacks 44 are mounted between the first pressing member 29 and the receiving member 43. Figure 7 As shown, a hydraulic pump 59 is connected to the double-acting jack 44 via a hydraulic pipe 58. When the hydraulic pump 59 is operated, the plunger 45 of the double-acting jack 44 is extended and retracted.

[0067] like Figure 1 to Figure 3 As shown, the support device 34 is a device that supports the core 25, the first pressing member 29, the second pressing member 30, and the moving device 32, and has a shaft body 46 inserted into the movable rod 42, a plurality of leg frames 47 provided at both ends of the shaft body 46, and a moving wheel 48 rotatably provided at the lower end of the leg frame 47. In addition, the moving wheels 48 are separated in the tube circumferential direction E and can roll freely in the tube axial direction B on the inner circumferential surfaces 2a and 3a of the tubes 2 and 3.

[0068] like Figure 2 As shown, when the first and second press members 29 and 30 move in the press direction C and reach the press position P1 , the first and second sealing members 26 and 27 are pressed into the first and second sealing member insertion spaces 37 and 38 .

[0069] In addition, if Figure 1 As shown in FIG. 1 , when the first pressing member 29 and the second pressing member 30 move in the pressing release direction D and return to the pressing release position P2 , the pressing of the first sealing member 26 and the second sealing member 27 is released.

[0070] like Figure 1 , Figure 2 As shown, when the test device body 21 is set at the joint portion 4 in the pipes 2 and 3, a test space 50 is formed all around the outer peripheral surface of the core 25 and the inner peripheral surfaces 2a and 3a of the pipes 2 and 3 in the pipe diameter direction A and between the first sealing member 26 and the second sealing member 27 in the pipe axis direction B. The test space 50 is connected to the seal body mounting recess 13 via a gap 51 between the inner end of the socket 7 and the front end of the insertion port 6.

[0071] The test fluid supply device 33 is a device for supplying water 53 (an example of test fluid) from the inner side of the core 25 to the test space 50, and includes a water supply hose 54 connected to the inner circumferential lower part of the core 25 and a hydraulic pump 55 provided at the front end of the water supply hose 54 (see Figure 7 ).

[0072] Furthermore, an exhaust hose 57 for exhausting the air in the test space 50 is connected to the inner circumferential upper portion of the core 25. The water supply hose 54 and the exhaust hose 57 penetrate the first press-fit member 29.

[0073] like Figure 4As shown, the moving operating rod 22 includes: a long operating rod body 60 detachably connected to the front end of the shaft body 46 of the test device body 21 and extending in the pipe axis direction B; a first main support member 61 and a second main support member 62 that support the operating rod body 60 on the inner wall surface 9a of the pipe laying pit 9 outside the pipes 2 and 3; and a first auxiliary support member 64 and a second auxiliary support member 65 that support the operating rod body 60 on the inner peripheral surface 3a in the second pipe 3. In addition, a water supply hose 54, an exhaust hose 57 and a hydraulic pipe 58 are arranged from the test device body 21 along the moving operating rod 22.

[0074] The first main supporting member 61 and the second main supporting member 62 each include a leg frame 67 suspended downward from the operating rod body 60 and a pair of main wheels 68 provided at the lower end of the leg frame 67. The pair of main wheels 68 are spaced apart in the pipe circumferential direction E.

[0075] In addition, the leg frame 67 can be supported in a posture K (see Figure 4 ) and the folded posture L folded into the tube 3 (refer to Figure 5 ) and applies force from the folded posture L to the supported posture K through the spring cylinder 69.

[0076] The first auxiliary support member 64 and the second auxiliary support member 65 each include a mounting frame 71 mounted on the lower side of the operating lever body 60 and a pair of auxiliary wheels 72 provided at the lower end of the mounting frame 71. Figure 8 As shown, the pair of auxiliary wheels 72 are separated in the tube circumferential direction E.

[0077] In addition, when conducting a watertight test on the joint 4 between the pipes 2 and 3, the Figure 8 to Figure 14 The joining jig 80 is shown.

[0078] like Figure 6 to Figure 10 As shown, the joining fixture 80 comprises: a pair of frame bodies 81a, 81b, which can be freely loaded and unloaded at the open end (an example of the other end) of the receiving interface 7 of the second pipe 3 and are divided into left and right parts; and mounting plates 83a, 83b (an example of a mounting part) for mounting a pair of left and right lever hoists 82a, 82b (an example of a pulling device) on the frame bodies 81a, 81b.

[0079] The two pole hoists 82 a and 82 b each include an anchor hook 141 provided on the main body side and a connection hook 143 provided at the front end of a chain 142 .

[0080] like Fig.11 , Fig.12As shown, one side of the frame body 81a has: a baffle 86, which can be freely loaded and unloaded on the open end face of the socket 7; a support 87, which is arranged on the surface of the baffle 86 and extends in the pipe axis direction B; 2 sets of clamping mechanisms 88, which clamp the open end of the socket 7 in the pipe diameter direction A; and an anti-tipping device 89, which is used to prevent the frame body 81 installed at the open end of the socket 7 of the second pipe 3 from tipping outward 90 in the pipe diameter direction A.

[0081] The two clamping mechanisms 88 each include a pair of fixed plates 91 and movable plates 92 facing each other in the tube diameter direction A, and a moving member 93 for moving the movable plate 92 relative to the fixed plate 91 in the tube diameter direction A. The fixed plate 91 is fixed to the back surface of the baffle 86 .

[0082] The moving member 93 includes a bolt body 94 having an external thread on the outer periphery, an engaging piece 95 provided at the front end of the bolt body 94 , an engaging member 96 provided at the movable plate 92 , and a support plate 97 supporting the bolt body 94 .

[0083] The support plate 97 is provided on the back side of the baffle plate 86, and a threaded hole 98 having an internal thread is formed in the support plate 97. The bolt body 94 is rotatably inserted into the threaded hole 98 in a state where the external thread and the internal thread are screwed together, and is supported by the support plate 97. The diameter of the engaging piece 95 is larger than the diameter of the bolt body 94, and the engaging piece 95 and the engaging member 96 are engaged in the axial direction of the bolt body 94.

[0084] like Fig.13 As shown, one mounting plate 83a has a mounting hole 100 provided on the outer side surface in the pipe diameter direction A of the support column 87 of one frame body 81a.

[0085] like Figure 8 to Figure 10 and Fig.13 As shown, the dump prevention device 89 includes: a roller 101 (an example of a rolling body) capable of abutting against the inner wall surface 9a of the pipe laying pit 9; and a position adjustment unit 102 for moving the position of the roller 101 in the pipe diameter direction A.

[0086] The position adjustment unit 102 includes a screw shaft 103 that penetrates the support column 87 of the frame body 81 in the pipe diameter direction A, a bracket 104 provided at the front end of the screw shaft 103, and an operating handle 106 for rotating the screw shaft 103. The roller 101 is rotatably provided on the bracket 104.

[0087] The screw shaft 103 has an external thread on its outer periphery, and is threadedly engaged with an internal thread of a nut body 105 provided on the support column 87. The screw shaft 103 and the bracket 104 are connected to each other so as to be relatively rotatable about the axis of the screw shaft 103.

[0088] The frame body 81 a on one side has the structure as described above, and the frame body 81 b on the other side also has the same structure as the frame body 81 a on one side.

[0089] According to the joining jig 80 as described above, Fig.12 As shown by the virtual line, the open end of the socket 7 is inserted between the fixed plate 91 and the movable plate 92 of the clamping mechanism 88 of the frame body 81a on one side, and the bolt body 94 is rotated in one direction to bring the movable plate 92 and the fixed plate 91 closer. As a result, the interval between the fixed plate 91 and the movable plate 92 in the pipe diameter direction A is shortened, and the open end of the socket 7 is clamped between the fixed plate 91 and the movable plate 92, as shown in FIG. Figure 8 to Figure 10 As shown, one frame body 81 a is installed at the open end of the receiving port 7 .

[0090] Moreover, similarly to the attachment of the one frame body 81 a , the other frame body 81 b can be attached to the opening end portion of the socket 7 .

[0091] Next, a watertightness test method for performing a watertightness test on the joint 4 between the pipes 2 and 3 using the watertightness test device 1 will be described.

[0092] like Figure 4 As shown, the first pipe 2 is the last pipe of the pipe 10 already joined in the pipe laying pit 9 and is supported by a support platform 111 such as a sleeper. In this state, first, the test device body 21 of the watertight test device 1 is inserted into the first pipe 2.

[0093] At this time, the operating rod body 60 of the moving operating rod 22 protrudes from the receiving port 7 of the first pipe 2 to the outside of the end of the first pipe 2, and is supported on the inner wall surface 9a of the pipeline laying pit 9 by the first main supporting member 61 and the second main supporting member 62 switched to the supporting posture K.

[0094] A lock ring 15 is pre-accommodated in the lock ring accommodating groove 12 in the socket 7 of the first pipe 2 , and a seal body 16 is pre-installed in the seal body installation recess 13 .

[0095] In addition, the plunger 45 of the double-acting jack 44 of the test device body 21 is shortened to return the first pressing member 29 and the second pressing member 30 to the pressing release position P2 (see Figure 1 ).

[0096] Furthermore, if Figure 4 As shown, two straps 112a and 112b (an example of a cable body) are preliminarily separated to the left and right (see Fig. 9) is wound around the outer circumference of the receiving end 7 of the first pipe 2, and a recovery rope 113 for recovering two sling belts 112a, 112b is connected to each sling belt 112a, 112b. Each sling belt 112a, 112b has a ring portion 145, 146 at both ends.

[0097] Then, if Figure 5 As shown, the second pipe 3 is placed on the transport cart 115 , and the transport cart 115 is driven in the joining direction G to transport the second pipe 3 to the front side of the first pipe 2 .

[0098] At this time, the opening end of the insertion port 6 of the second tube 3 abuts against the first main support member 61 and the second main support member 62 of the moving operating rod 22 of the watertight test device 1, and the leg frames 67 of the first main support member 61 and the second main support member 62 are switched from the supporting posture K to the folding posture L, and the moving operating rod 22 is inserted into the second tube 3. At this time, the operating rod body 60 is supported on the inner peripheral surface 3a of the second tube 3 by the first auxiliary support member 64 and the second auxiliary support member 65.

[0099] Then, the joining jig 80 is installed at the open end of the receiving port 7 of the second pipe 3. Fig.12 As shown by the virtual line, the opening end of the receiving port 7 of the second pipe 3 is inserted between the fixed plate 91 and the movable plate 92 of the frame body 81a on one side, and the movable plate 92 is brought close to the fixed plate 91 by rotating the bolt body 94 in one direction, so that the opening end of the receiving port 7 of the second pipe 3 is sandwiched between the movable plate 92 and the fixed plate 91 in the pipe diameter direction A. As a result, Figure 6 , Figure 8 to Figure 10 As shown, one frame body 81 a is installed at the open end of the receiving port 7 of the second pipe 3 .

[0100] Similarly, by attaching the other frame body 81 b to the open end portion of the socket 7 of the second pipe 3 , the joining jig 80 is attached to the open end portion of the socket 7 of the second pipe 3 .

[0101] At this time, if Figure 8 , Fig. 9 As shown, a passage space 117 for pulling out the movable operating rod 22 is ensured between the frame body 81a on one side and the frame body 81b on the other side in the central part of the receiving interface 7 (the other end portion) of the second tube 3 and in the tube diameter direction A, and the frame body 81a on one side and the frame body 81b on the other side are arranged around the passage space 117.

[0102] Moreover, if Fig. 9 , Fig.10As shown, the anchor hook 141 of the pole hoist 82a on one side is hooked on the mounting hole 100 of the mounting plate 83a on one side, and the connecting hook 143 is hooked on the ring portion 146 of the sling 112a on one side. In addition, the anchor hook 141 of the pole hoist 82b on the other side is hooked on the mounting hole 100 of the mounting plate 83b on the other side, and the connecting hook 143 is hooked on the ring portion 146 of the sling 112b on the other side.

[0103] Thus, the left and right rod lifts 82a and 82b are mounted on the joining jig 80 and connected to the left and right slings 112a and 112b. Fig. 9 As shown, one rod lift 82a is located outside the pipe diameter direction A of one frame body 81a, and the other rod lift 82b is located outside the pipe diameter direction A of the other frame body 81b.

[0104] Then, if Figure 6 , Fig. 9 , Fig.10 As shown, the operator 118 operates the operating levers 144 of the two rod lifts 82a and 82b, so that the two slings 112a and 112b are pulled toward the disengagement direction H of the second pipe 3, respectively. In contrast, a reaction force F is generated in the second pipe 3, and the reaction force F pulls the second pipe 3 toward the engagement direction G, and the insertion port 6 (one end) of the second pipe 3 is inserted into the receiving port 7 of the first pipe 2. As a result, the second pipe 3 is engaged with the first pipe 2.

[0105] At this time, if Figure 6 , Figure 8 , Fig. 9 As shown, the front end of the moving operation rod 22 of the watertight test device 1 passes through the passage space 117 and protrudes outward from the receiving port 7 of the second pipe 3 without interfering with the joining jig 80. In addition, the second pipe 3 is supported by the support stand 111.

[0106] As described above, in a state where the second pipe 3 is pulled in the joining direction G using the rod lifters 82a and 82b, Figure 7 As shown, the operator 118 operates the front end of the moving operating rod 22 of the watertight test device 1 from the outside of the end of the receiving port 7 of the second pipe 3 to move the test device body 21 to the joint 4 of the two pipes 2 and 3.

[0107] At this time, if Figure 8 , Fig. 9 As shown, the moving operating rod 22 passes through the through space 117 and is pulled out from the socket 7 of the second pipe 3 to the outside of the end portion without interfering with the joining jig 80. Therefore, the moving operating rod 22 can be easily pulled out from the socket 7 of the second pipe 3 to the outside. Figure 7As shown, since the first main supporting member 61 is pulled outward from the second pipe 3 and switched from the folded posture L to the supported posture K, the operating rod body 60 is supported by the first main supporting member 61 on the inner wall surface 9 a of the pipe laying pit 9 .

[0108] In addition, if Figure 1 As shown, since the first and second pressing members 29 and 30 are returned to the pressing release position P2, the compression of the first and second sealing members 26 and 27 is released, and the test device body 21 can be easily moved in the tube axis direction B.

[0109] Then, the watertightness test of the joint portion 4 is performed using the test device main body 21. Figure 2 As shown, the hydraulic pump 59 (refer to Figure 7 ) works, causing the plunger 45 of the double-acting jack 44 to extend, thereby the first pressing member 29 moves in the pressing direction C to reach the pressing position P1, and the movable rod 42 of the moving device 32 moves in the opposite direction J of the first pressing member 29, and the second pressing member 30 moves in the pressing direction C to reach the pressing position P1.

[0110] Thus, the first pressing member 29 presses the first sealing member 26 into the first sealing member insertion space 37 and compresses it, and the second pressing member 30 presses the second sealing member 27 into the second sealing member insertion space 38 and compresses it, so that the outer peripheral surface of the core 25 and the inner peripheral surface of the second tube 3 are fully sealed by the compressed first sealing member 26, and the outer peripheral surface of the core 25 and the inner peripheral surface of the first tube 2 are fully sealed by the compressed second sealing member 27.

[0111] Then, the hydraulic pump 55 (see Figure 7 ) operates to supply water 53 from the water supply hose 54 to the test space 50. As a result, the air in the test space 50 and the seal body mounting recess 13 is exhausted through the exhaust hose 57, and at the same time, the water 53 supplied to the test space 50 is filled into the seal body mounting recess 13 through the gap 51. In this way, in a state where the test space 50 and the seal body mounting recess 13 are filled with water 53 of a specified pressure, a watertight test of the joint portion 4 of the pipes 2 and 3 is performed by checking whether there is leakage of the water 53 from the seal body 16, etc.

[0112] According to the above watertight test method, if Figure 7As shown, after the second pipe 3 is joined to the first pipe 2 using the rod lifters 82a and 82b, the watertightness test of the joined portion 4 of the pipes 2 and 3 is performed using the test device body 21 while the second pipe 3 is pulled in the joining direction G. Therefore, during the watertightness test, the second pipe 3 is restrained by the first pipe 2 in the pipe axial direction B via the joining jig 80, the rod lifters 82a and 82b, and the slings 112a and 112B. Figure 2 As shown, when the watertight test is performed, the second tube 3 can be prevented from coming out of the first tube 2 due to the pressure of the water 53 filling the test space 50 and the sealing body mounting recess 13 .

[0113] In addition, if Figure 6 As shown in FIG. 1 , when the operator 118 operates the operating lever 144 of the rod lift 82a to pull the sling 112a of one side toward the detachment direction H of the second pipe 3, as shown in FIG. Fig. 9 As shown, an outward external force f in the pipe diameter direction A acts on one frame body 81a. With respect to such external force f, the roller 101 of the anti-dumping device 89 abuts against the inner wall surface 9a of the pipe laying pit 9, and the frame body 81a on one side is supported on the inner wall surface 9a side by the anti-dumping device 89. Thus, the frame body 81a on one side can be prevented from tipping outward 90 in the pipe diameter direction A.

[0114] Similarly, the other frame body 81b is also supported on the inner wall surface 9a side of the pipe laying pit 9 by the anti-falling device 89, so that the other frame body 81b can be prevented from falling to the outside 90 in the pipe diameter direction A.

[0115] In addition, when the second tube 3 is joined to the first tube 2, as the second tube 3 moves in the joining direction G, the roller 101 of the anti-dumping device 89 rolls in the joining direction G while abutting against the inner wall surface 9a of the pipeline laying pit 9, so the joining clamp 80 moves smoothly in the joining direction G integrally with the second tube 3.

[0116] Furthermore, by operating the operating handle 106 of the position adjustment unit 102 to rotate the screw shaft 103, the position of the roller 101 moves in the pipe diameter direction A. Thus, the position of the roller 101 is moved in the pipe diameter direction A according to the position of the inner wall surface 9a of the pipe laying pit 9, so that the roller 101 can be reliably abutted against the inner wall surface 9a of the pipe laying pit 9.

[0117] In addition, after the watertight test of the joint part 4 is performed as described above, the joint clamp 80, the rod hoists 82a, 82b and the slings 112a, 112b are temporarily removed, and then another pipe is joined to the second pipe 3. By repeatedly performing the watertight test of the joint part, the watertight test of the joint part can be performed while the pipes are joined to each other.

[0118] like Fig.12 As shown, the bolt body 94 of the joining fixture 80 is rotated in the other direction to separate the movable plate 92 from the fixed plate 91, and the two frame bodies 81a and 81b are removed from the open end of the socket 7 of the second tube 3, so that the test device body 21 can be taken out from the open end of the socket 7 of the tube 3 to the outside.

[0119] Furthermore, after the frame bodies 81a, 81b and the rod lifters 82a, 82b of the joining jig 80 are removed, the slings 112a, 112b can be detached from the outer periphery of the socket 7 of the first pipe 2 by operating the recovery rope 113 and recovered.

[0120] (Second Embodiment)

[0121] In the first embodiment described above, if Figure 8 As shown in FIG. 1 , the joining jig 80 has a pair of frame bodies 81a and 81b divided into left and right parts. However, as a second embodiment, Fig.15 As shown, the baffle 86 of one frame body 81a and the baffle 86 of the other frame body 81b can also be connected by a pair of upper and lower connecting frames 125, 126. In this case, the space 117 is ensured between the left and right sides of the baffle 86 of the two frame bodies 81a, 81b and between the upper and lower sides of the two connecting frames 125, 126.

[0122] In addition, in the above embodiments, Figure 8 As shown, two frame bodies 81a and 81b are separated by 180° and installed on the socket 7 of the second pipe 3, but it is not limited to two. For example, three frame bodies can also be separated by 120° and installed on the socket 7 of the second pipe 3.

[0123] In addition, in the above embodiments, Figure 4 As shown, the movement operation rod 22 includes the operation rod body 60 , the main support members 61 , 62 , and the auxiliary support members 64 , 65 , but may not include at least one of the main support members 61 , 62 and the auxiliary support members 64 , 65 .

[0124] In addition, in the above-mentioned embodiment, the case of laying pipes in a pipe laying pit 9 in which pipes have already been laid or in a tunnel or shield, etc. is described, but the present invention is not limited to such a pipe laying pit 9, but can also be applied to the case of laying pipes in a groove excavated on the ground (excavation construction method).

Claims

1. A watertightness test method, comprising: joining one end of a second pipe to a first pipe and performing a watertightness test on the joined portion, wherein: Inserting a test device body of a watertight test device for performing a watertight test in a pipe into the first pipe, Install a joining fixture on the other end of the second pipe. The pulling device is mounted on the joining jig and connected to the cable body pre-wound around the outer periphery of the first tube. The pulling device is operated to pull the cable body in the direction of separation of the second tube, thereby utilizing the reaction force generated on the second tube to pull the second tube in the direction of engagement and insert one end of the second tube into the end of the first tube, thereby engaging one end of the second tube with the first tube. While the second tube is pulled in the joining direction, the moving operation lever provided on the test device body is operated from the outside of the other end of the second tube to move the test device body to the joining portion in the tube to perform a watertight test on the joining portion.

2. The watertight test method according to claim 1, characterized in that: When the moving operating rod is operated from the outside of the other end of the second tube and the test device body is moved to the joining portion in the tube, the moving operating rod passes through the passage space ensured in the central portion of the other end of the second tube and is pulled out from the other end of the second tube to the outside without interfering with the joining clamp.

3. A joining fixture, used in the watertight test method according to claim 1 or 2, characterized in that: The second tube has a detachable frame body and a mounting portion for mounting the pulling device on the frame body. The mounting portion is arranged on the frame body, The frame body can be mounted on the other end portion of the second pipe so as to be arranged around the passage space for pulling out the movement operating rod.

4. The joining jig according to claim 3, characterized in that: The mounting portion is arranged on the outside of the frame body in the pipe diameter direction. The anti-dumping device is arranged on the frame body, and the anti-dumping device is used to prevent the frame body installed at the other end of the second pipe from tipping outward in the pipe diameter direction. The tipping prevention device has a rolling body that can come into contact with a wall surface surrounding the pipe.

5. The joining jig according to claim 4, characterized in that: The anti-tilting device includes a position adjustment unit for moving the position of the rolling element in the pipe diameter direction.

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