Pipe joint device and pipe joint method

Abstract

To provide a pipe joint device which can obtain reaction force of pipe pushing means which pushes a new pipe from an object other than a rail, and to provide a pipe joint method.SOLUTION: A pipe joint device 1 has: a fixed member 2 fixed to an inner surface of a sheath pipe S in which a new pipe P is arranged; and pipe pushing means 3 which is provided at the fixed member 2 and pushes the new pipe P in a pipe axis direction. A pipe joint method includes: an insertion step in which the spigot part of the new pipe P positioned at the rear is pushed and inserted into a predetermined position of a socket of a preceding pipe P' positioned at the front by the pipe pushing means 3 of the pipe joint device 1; and a removal step in which the socket of the new pipe P is hung by a hanging jig 9 attached to the handing part 10 of the pipe joint device 1 to remove pipe transport members for transporting the new pipe P from an area below the new pipe P.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a pipe joining device and a pipe joining method.

Background Art

[0002] As a laying method for liquid transportation facilities (pipelines) such as water and sewage, a method of newly installing a sleeve pipe by a jacking method or a combined jacking and shield method, and laying a push-on joint type ductile iron pipe such as a PN type ductile iron pipe in this sleeve pipe by a pipe insertion method has been put into practical use as a hybrid system method (hereinafter referred to as the HyW method). Since the HyW method is constructed with a minimum diameter difference of three diameters between the sleeve pipe and the newly installed pipe (ductile iron pipe) piped inside it, an operator cannot approach the outside of the pipe receiving port of the joining partner, and a working method of attaching a wire rope or a sling belt to the receiving port of the partner pipe and pulling it in with a lever block cannot be adopted.

[0003] Therefore, for example, in Patent Document 1 below, when joining the pipe 4B in the shield tunnel 3, a reaction force member 32 for obtaining the reaction force when pushing in the pipe 4B by the actuator 31 is configured so as to engage with the main girder 2 of the segment 1 constituting the shield tunnel 3, thereby enabling the pushing in of the pipe 4B.

[0004] On the other hand, when the sleeve pipe is a concrete pipe, since its inner surface is flat, a reaction force cannot be obtained with the same configuration as in Patent Document 1. For this reason, after integrating the rails for transporting the newly installed pipe in the sleeve pipe in the longitudinal direction or fixing the rails to the inner surface of the sleeve pipe with anchor bolts or the like, pipe pushing means such as a hydraulic jack may be attached to these rails, and the newly installed pipe may be configured to be pushed in by the reaction force from the rails.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] As described above, when configured to obtain a reaction force from the rail, the integrated or fixed rail remains in the sheath or pipe as it is, and there is a problem that it is difficult to reuse.

[0007] Therefore, an object of the present invention is to provide a pipe joining device and a pipe joining method capable of obtaining a reaction force for pushing a new pipe from a source other than the rail.

Means for Solving the Problems

[0008] To solve the above problems, in the present invention, a fixing member fixed to the inner surface of the sheath pipe in which the new pipe is to be laid, a pipe pushing means provided on the fixing member for pushing the new pipe in the pipe axis direction, and a pipe joining device having the above is configured.

[0009] In this way, by obtaining the reaction force of the pipe pushing means from the inner surface of the sheath pipe, it is not necessary to obtain the reaction force from the rail for pipe transportation, and the integration of the rails and the fixing of the rails to the inner surface of the sheath pipe are not required. For this reason, the used rails can be easily recovered and reused.

[0010] In the pipe joining device according to the above configuration, the fixing member preferably includes an upper base member supported by the inner surface of the sheath pipe above the axis of the sheath pipe, a lower base member supported by the inner surface of the sheath pipe below the axis of the sheath pipe, and a biasing member that biases the upper base member and the lower base member in a direction away from each other in the vertical direction to press each base member against the inner surface of the sheath pipe. In this way, the fixing member can be stably fixed in the sheath pipe.

[0011] In the configuration having the biasing means, it is preferable that a plurality of biasing members are provided. By doing so, the pressing force on the inner surface of the sheath tube acting on the upper base member and the lower base member increases, and it becomes possible to receive a large reaction force from the tube pushing means.

[0012] In all of the above configurations, it is preferable that a retainer for holding the tube pushing means is provided on the fixing member. By doing so, it is not necessary for the operator to support the tube pushing means until the pushing force acts on the new tube from the tube pushing means, so that the working efficiency can be improved.

[0013] In the configuration having the upper base member, it is preferable that a hanging portion for attaching a hanging jig for hanging the tube body is provided on the upper base member. By doing so, after pushing in the new tube with the tube pushing means, the tube end of the new tube can be lifted by the hanging jig provided on the hanging portion, so that the pulling-out operation of the carriage and the recovery operation of the rail can be performed smoothly, and the working efficiency can be improved.

[0014] In the configuration having the lower base member, it is preferable that an anti-rotation body extending in the tube axis direction and supported by the inner surface of the sheath tube is provided on the lower base member. By doing so, the rotation of the fixing member due to the rotational moment generated in the lower base member when the new tube is pushed in by the tube pushing means can be suppressed by this anti-rotation body.

[0015] In the configuration having the retainer, the pipe pushing means projects in the pipe axis direction when pushing in the new pipe, and is of a telescopic type in which the length in the pipe axis direction is the shortest in the standby state, and the tip in the protruding direction of the pipe pushing means in the standby state is preferably positioned behind the tips in the protruding direction of the fixing member and the retainer in the pipe axis direction. By doing so, the fixing member provided with the pipe pushing means can be brought as close as possible to the receiving port of the new pipe. Therefore, when suspending the pipe end of the new pipe after pushing in the new pipe, the axial distance between the suspension position and the fixing member becomes short, and the overturning moment acting on the pipe joining device can be reduced.

[0016] Also, in order to solve the above problems, in this invention, In a pipe joining method of sequentially piping new pipes inside a sheath pipe, an upper base member that contacts the inner surface of the sheath pipe above the axis of the sheath pipe, a lower base member that contacts the inner surface of the sheath pipe below the axis of the sheath pipe, and a biasing member that biases the upper base member and the lower base member away from each other in the vertical direction to press each base member against the inner surface of the sheath pipe, a fixing member having the biasing member, a pipe pushing means provided on the fixing member for pushing the new pipe in the pipe axis direction, and a suspension portion provided on the upper base member to which a suspension jig for suspending the pipe body is attached. An insertion step of pushing the insertion port of the new pipe arranged at the rear into the receiving port of the preceding pipe arranged at the front to a predetermined position and inserting it by the pipe pushing means of the pipe joining device; a removal step of lifting the receiving port of the new pipe by the suspension jig attached to the suspension portion of the pipe joining device and removing a pipe transporting member for transporting the new pipe from below the new pipe; A pipe joining method is configured to include the above.

[0017] In this way, by taking the reaction force of the pipe pushing means from the inner surface of the sheath pipe, it is not necessary to take the reaction force from the rails for pipe transportation, and the integration of the rails and the fixing of the rails to the inner surface of the sheath pipe are not required. Therefore, by suspending the pipe end of the new pipe with the suspension jig provided at the suspension part of the pipe joining device, the used rails can be easily recovered and reused.

[0018] In the pipe joining method according to the above configuration, when the socket of the new pipe arranged at the rear is lifted in the removal step, it is preferable that the suspension part is located on the back side in the pipe axis direction with respect to the end face of the socket. In this way, when the socket of the new pipe is lifted, the pipe end of this socket is pressed in the pushing direction by the suspension jig provided at the suspension part, so that the insertion port of the new pipe can be prevented from coming out of the socket of the preceding pipe.

Advantages of the Invention

[0019] In this invention, in the pipe joining device and the pipe joining method, by fixing the fixing member to the inner surface of the sheath pipe, the reaction force of the pipe pushing means is taken from the inner surface of the sheath pipe, so it is not necessary to take the reaction force from the rails for pipe transportation, and the integration of the rails and the fixing of the rails to the inner surface of the sheath pipe are not required. Therefore, the used rails can be easily recovered and reused.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7A

Figure 7B

Figure 7C

Figure 7D

Figure 7E

Figure 7F

Figure 7G

Figure 7H

Figure 8

Figure 9

Embodiment for Carrying Out the Invention

[0021] An embodiment of the pipe joining device 1 according to the present invention will be described with reference to the drawings. As shown in Figs. 1 to 6, this pipe joining device 1 mainly includes a fixing member 2 fixed to the inner surface of a sheath pipe S in which a new pipe P is laid, and a pipe pushing means 3 provided on the fixing member 2 for pushing the new pipe P in the pipe axis direction. In this embodiment, the new pipe P is a ductile iron pipe, and the sheath pipe S is a concrete pipe.

[0022] The fixing member 2 includes an upper base member 4 supported by the inner surface of the sheath tube S above the axis of the sheath tube S, a lower base member 5 supported by the inner surface of the sheath tube S below the axis of the sheath tube S, and a biasing member 6 that biases the upper base member 4 and the lower base member 5 in a direction away from each other in the vertical direction to press the base members 4 and 5 against the inner surface of the sheath tube S.

[0023] The upper base member 4 is a steel member having an arc portion 7 with a C-shaped cross-section that extends in an arc along the inner surface of the sheath tube when viewed from the tube axis direction, and a pair of plate-like extending portions 8 that extend in the tube axis direction from both ends of the arc portion 7. A hanging portion 10 for attaching a hanging jig 9 (see FIG. 6) for suspending the tube body is provided on the tip side in the pushing direction of the new tube P of the extending portion 8. In this embodiment, the hanging portion 10 is a hanging hole (hereinafter, the same reference numeral as the hanging portion 10 is used). The position of the hanging hole 10 is designed such that the length of the extending portion 8 is such that when the receiving port of the new tube P arranged behind the preceding tube P' (the joined new tube) is lifted in the removal process of the tube joining method described later, it is on the back side in the tube axis direction from the end face of this receiving port.

[0024] The lower base member 5 is a steel member having an upward convex shape with a C-shaped cross-section in an arc shape when viewed from the tube axis direction. A pair of plate-like rotation preventers 11 that extend in the tube axis direction are provided at both ends of the lower base member 5. The lower base member 5 is supported by the inner surface of the sheath tube S via the rotation preventers 11 or directly.

[0025] In this embodiment, a screw jack (hereinafter, the same reference numeral as that of the biasing member 6 is used) is employed as the biasing member 6. A right-handed screw 12 is provided on the upper base member 4 side, and a left-handed screw 13 is provided on the lower base member 5 side of the screw jack 6, respectively. By tightening each screw 12, 13 to extend the screw jack 6, a frictional force is generated between each base member 4, 5 and the inner surface of the sheath tube S, and the fixing member 2 is fixed to the inner surface of the sheath tube S by this frictional force. In FIG. 3, a configuration in which one screw jack 6 is provided between both base members 4, 5 is shown. However, as shown in FIG. 4, a configuration in which a plurality of screw jacks 6 are provided between both base members 4, 5 can also be adopted. Further, instead of the screw jack 6, other types of biasing members 6 such as a hydraulic jack can also be adopted.

[0026] In this embodiment, a hydraulic jack (hereinafter, the same reference numeral as that of the tube pushing means 3 is used) is employed as the tube pushing means 3. This hydraulic jack 3 is held by a holder 15 fixed to the lower base member 5 with bolts 14. The rod of the hydraulic jack 3 is of a telescopic type that protrudes in the axial direction when pushing the new tube P and has the shortest axial length in the standby state. In this standby state, the tip of the rod of the hydraulic jack 3 in the protruding direction is located behind the tips of the fixing member 2 (lower base member 5) and the holder 15 in the protruding direction.

[0027] As shown in FIG. 5, the holder 15 has substantially no gap on the front side in the axial direction with respect to the lower base member 5, while a slight gap g is provided in the axial direction on the rear side in the axial direction. The size of this gap g is such that when the rod of the hydraulic jack 3 pushes the new tube P, it allows the hydraulic jack 3 to tilt slightly downward as it moves backward due to the reaction force of the pushing.

[0028] As shown in Fig. 6, a suspension jig 9 can be provided in the suspension hole 10 of the pipe joining device 1. The suspension jig 9 in this embodiment includes a nylon sling 16 provided in the suspension hole 10, a lever block 17, and a pipe clamp 18 fixed to the lower part of the receiving port end face of the new pipe P. The lever block 17 is suspended by the nylon sling 16. The hook provided at the lower end of the lever block 17 is attached to the pipe clamp 18. By the operator operating the lever block 17, the receiving port side of the new pipe P is lifted up.

[0029] The pipe joining method using the above pipe joining device 1 will be described with reference to the drawings. This pipe joining method is a method for sequentially piping the new pipe P inside the sheath pipe S, and mainly includes an insertion step of inserting the new pipe P and a removal step of removing the pipe transportation members (in this embodiment, the cart C and the pipe rail R).

[0030] The insertion step is performed by the hydraulic jack 3 of the pipe joining device 1 having the pipe joining device 1 described above, that is, the upper base member 4 that contacts the inner surface of the sheath pipe S above the axis of the sheath pipe S, the lower base member 5 that contacts the inner surface of the sheath pipe S below the axis of the sheath pipe S, and the biasing member 6 (screw jack 6) that biases the upper base member 4 and the lower base member 5 in a direction away from each other in the vertical direction to press the base members 4 and 5 against the inner surface of the sheath pipe S, the pipe pushing means 3 (hydraulic jack 3) provided on the fixing member 2 for pushing the new pipe P in the pipe axis direction, and the suspension part 10 (suspension hole 10) provided on the upper base member 4 to which the suspension jig 9 for suspending the pipe body is attached. In this step, the insertion port of the new pipe P arranged at the rear is pushed into the receiving port of the preceding pipe P' arranged in the front to a predetermined position and inserted.

[0031] In the insertion process, first, as shown in Fig. 7A, the new pipe P is placed on the cart C and transported to near the receiving port of the preceding pipe P' arranged in the front. The cart C is provided on two pipe rails R arranged in parallel along the pipe axis direction. The pipe rails R are not fixed to the inner surface of the sheath pipe S and can be disassembled, folded, or telescoped into a plurality of short rails. The cart C travels on the pipe rails R by a battery car B (see Fig. 7B) operated by an operator.

[0032] After transporting the new pipe P to near the receiving port of the preceding pipe P', as shown in Fig. 7B, the insertion port of the new pipe P is placed into the receiving port of the preceding pipe P'. Then, as shown in Fig. 7C, the pipe joining device 1 is attached as close as possible to the end face of the receiving port of the new pipe P. At this time, the suspension hole 10 formed in the pipe joining device 1 is located on the back side in the pipe axis direction from the end face of the receiving port of the new pipe P'.

[0033] Furthermore, as shown in Figs. 7D and 8, by protruding the rod of the hydraulic jack 3 of the pipe joining device 1, the new pipe P is pushed in until the tip of the insertion port of the new pipe P abuts against the distance piece 19 provided on the inner surface of the receiving port of the preceding pipe P'. In the state where the tip of the insertion port abuts against the distance piece 19, the locking ring provided on the inner surface of the receiving port has not yet been fitted into the circumferential groove formed in the insertion port. Therefore, after visually checking or checking with a camera for abnormalities such as displacement of the rubber ring intervening between the two pipes P' and P, if such an abnormality is confirmed, the correction is made by finely adjusting between the preceding pipe P' and the new pipe P or by once pulling out the new pipe P.

[0034] The removal process is a process of lifting the receiving port of the new pipe P by a lifting jig 9 attached to the suspension hole 10 of the pipe joining device 1 and removing the pipe transport members (cart C, pipe rails R) for transporting the new pipe P from below the new pipe P.

[0035] In the removal process, first, as shown in FIG. 7E, with the distance piece 19 provided, a suspension jig 9 (a nylon sling 16, a lever block 17, and a pipe clamp 18 (see FIG. 6)) is attached to the suspension hole 10 of the pipe joining device 1. Then, by operating the lever block 17, as shown in FIGS. 7F and 9, the receiving port side of the new pipe P is lifted, the trolley C is pulled out from under the new pipe P, and the pipe rail R is removed.

[0036] Furthermore, as shown in FIG. 7G, a pipe support 20 is installed at the lower part of the receiving port of the new pipe P, the new pipe P is lowered onto this pipe support 20, and then the distance piece 19 is removed. Then, the lock ring provided on the inner surface of the receiving port of the preceding pipe P' fits into the circumferential groove formed at the insertion port of the new pipe P, and the new pipe P is pushed in by the pipe joining device 1 until the distance between the preceding pipe P' and the new pipe P becomes a predetermined distance (barrel attachment distance). Then, as shown in FIG. 7H, after installing a floating prevention material 21 on the upper part of the receiving port of the new pipe P, the pipe joining device 1 is removed, and the removed pipe rail R and the pipe joining device 1 are returned to the starting shaft (not shown) by the trolley C. By repeating the series of operations described in FIGS. 7A to 7H above, the new pipes P are sequentially joined.

[0037] Since the above pipe joining device 1 and pipe joining method are configured to obtain the reaction force of the pipe pushing means 3 (hydraulic jack 3) from the inner surface of the guide pipe S, integration of the rails for obtaining the reaction force from the pipe transportation rails and fixing of the rails to the inner surface of the guide pipe are not required, and the used rails can be easily recovered and reused.

[0038] In addition, in the above-described pipe joining device 1, the fixing member 2 includes an upper base member 4 supported by the inner surface of the sheath pipe S above the axial center of the sheath pipe S, a lower base member 5 supported by the inner surface of the sheath pipe S below the axial center of the sheath pipe S, and a biasing member 6 (screw jack 6) that biases the upper base member 4 and the lower base member 5 in a direction away from each other in the vertical direction and presses the base members 4 and 5 against the inner surface of the sheath pipe S. Therefore, the fixing member 2 can be stably fixed within the sheath pipe S. Further, by providing a plurality of such biasing members 6, the pressing force against the inner surface of the sheath pipe S acting on the upper base member 4 and the lower base member 5 is increased, and it becomes possible to receive a large reaction force from the pipe pushing means 3.

[0039] In this embodiment, the fixing member 2 is fixed by the frictional force generated between both base members 4 and 5 and the inner surface of the sheath pipe S. However, for example, it is also possible to adopt a configuration in which claw portions are provided on both base members 4 and 5 and the fixing member 2 is fixed by biting these claw portions into the inner surface of the sheath pipe S.

[0040] In addition, in the above-described pipe joining device 1, the lower base member 5 has an upward convex shape in a C-shaped cross-sectional arc when viewed axially. Therefore, it is possible to suppress the deformation of the lower base member 5 due to the downward pressing force from the biasing member 6. As a result, the lower base member 5 can be stably fixed to the inner surface of the sheath pipe S by a large pressing force from the biasing member 6, and the fixing member 2 can receive a large reaction force from the pipe pushing means 3. At the same time, there is also a possibility that the weight of the lower base member 5 can be reduced along with the increase in shape strength.

[0041] In addition, in the above-described pipe joining device 1, since the holder 15 for holding the pipe pushing means 3 is provided on the fixing member 2 (lower base member 5), it is not necessary for the operator to support the pipe pushing means 3 until a pushing force acts on the newly installed pipe P from the pipe pushing means 3, and the work efficiency can be improved. Further, since the holder 15 is fixed to the fixing member 2 with bolts 14, it is possible to prevent the pipe pushing means 3 from rising due to the couple force acting on the pipe pushing means 3 when the newly installed pipe P is pushed in and dropping off together with the holder 15.

[0042] In addition, in the above-described pipe joining device 1, an axial gap g is provided between the holder 15 and the lower base member 5 on the rear side in the axial direction of the holder 15. Therefore, when the rod of the hydraulic jack 3 employed as the pipe pushing means 3 pushes the newly installed pipe P, the hydraulic jack 3 inclines slightly downward as it moves backward due to the reaction force of the pushing. As a result, the oil in the hydraulic jack 3 can be collected at a predetermined position (rear), and in the case of the hydraulic jack 3 of the type having an oil reservoir at the rear, the hydraulic jack 3 can be operated efficiently. When a hydraulic jack 3 in which the position of the oil reservoir does not affect the operation is employed, the axial gap g between the holder 15 and the lower base member 5 can be eliminated.

[0043] In addition, in the above-described pipe joining device 1, since the hanging portion 10 (hanging hole 10) for attaching the hanging jig 9 for hanging the pipe body is provided on the upper base member 4, after the newly installed pipe P is pushed in by the pipe pushing means 3, the pipe end of the newly installed pipe P is lifted by the hanging jig 9 provided on the hanging portion 10, so that the pulling-out operation of the carriage C and the recovery operation of the rail (pipe rail R) can be performed smoothly, and the work efficiency can be improved.

[0044] In addition, in the above-described pipe joining device 1, the pipe pushing means 3 is a telescopic type that protrudes in the pipe axis direction when pushing in the new pipe P and has the shortest length in the pipe axis direction in the standby state. The tip of the pipe pushing means 3 in the protruding direction in the standby state is located behind the tips of the fixing member 2 and the retainer 15 in the pipe axis direction. Therefore, the fixing member 2 provided with the pipe pushing means 3 can be brought as close as possible to the receiving port of the new pipe P. For this reason, when lifting the pipe end of the new pipe P after pushing in the new pipe P, the axial distance between the hanging position and the fixing member 2 is shortened, and the overturning moment acting on the pipe joining device 1 can be reduced.

[0045] In addition, in the above-described pipe joining device 1, plate-shaped rotation preventers 11 extending in the pipe axis direction are provided at both ends of the lower base member 5. Therefore, the rotation of the fixing member 2 due to the rotational moment generated in the lower base member 5 when the new pipe P is pushed in by the pipe pushing means 3 can be suppressed by the rotation preventers 11.

[0046] In addition, in the above-described pipe joining method, when lifting the receiving port of the new pipe P in the removal process, the hanging portion 10 is located deeper in the pipe axis direction than the end face of the receiving port. Therefore, when lifting the receiving port of the new pipe P, the pipe end of the receiving port is pressed in the pushing direction by the hanging jig 9 provided on the hanging portion 10, and the insertion port of the new pipe P can be prevented from coming out of the receiving port of the preceding pipe P'.

[0047] The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. Therefore, the scope of the present invention is shown not by the above description but by the claims, and it is intended that the claims include meanings equivalent to the claims and all modifications.

Explanation of Reference Numerals

[0048] 1 Pipe joining device 2 Fixing member 3 Pipe pushing means (hydraulic jack) 4 Upper base member 5 Lower base member 6 Biasing member (screw-type jack) 7 Arc portion 8 Extension portion 9 Hanging jig 10 Hanging portion (hanging hole) 11 Anti-rotation body 12 Right-handed screw 13 Left-handed screw 14 Bolt 15 Retainer 16 Nylon sling 17 Lever block 18 Pipe clamp 19 Distance piece 20 Pipe support 21 Anti-floating material P Newly installed pipe S Sheath pipe P’ Existing pipe g Gap C Cart R Pipe rail B Battery car

Claims

1. A fixing member (2) fixed to the inner surface of a sheath pipe (S) through which a new pipe (P) is piped, A pipe pushing means (3) provided on the fixing member (2) for pushing the new pipe (P) in the pipe axis direction, A pipe joining device having the above.

2. The fixing member (2) includes an upper base member (4) supported by the inner surface of the sheath pipe (S) above the axis of the sheath pipe (S), and a lower base member (5) supported by the inner surface of the sheath pipe (S) below the axis of the sheath pipe (S), and a biasing member (6) that biases the upper base member (4) and the lower base member (5) in a direction away from each other in the vertical direction to press each base member (4, 5) against the inner surface of the sheath pipe (S). The pipe joining device according to Claim 1.

3. The pipe joining device according to Claim 2, wherein a plurality of the biasing members (6) are provided.

4. The pipe joining device according to Claim 2, wherein a holder (15) for holding the pipe pushing means (3) is provided on the fixing member (2).

5. The pipe joining device according to Claim 2, wherein a hanging portion (10) for attaching a hanging jig (9) for hanging a pipe body is provided on the upper base member (4).

6. The pipe joining device according to Claim 2, wherein an anti-rotation body (11) extending in the pipe axis direction and supported by the inner surface of the sheath pipe (S) is provided on the lower base member (5).

7. The pipe pushing means (3) is a telescopic type that protrudes in the pipe axis direction when pushing the new pipe (P) and has the shortest length in the pipe axis direction in the standby state. The tip of the pipe pushing means (3) in the protruding direction in the standby state is located behind the tips of the fixing member (2) and the holder (15) in the pipe axis direction. The pipe joining device according to Claim 4.

8. In a pipe joining method of sequentially piping a new pipe (P) inside a sheath pipe (S), an upper base member (4) that contacts the inner surface of the sheath pipe (S) above the axis of the sheath pipe (S), a lower base member (5) that contacts the inner surface of the sheath pipe (S) below the axis of the sheath pipe (S), and a biasing member (6) that biases the upper base member (4) and the lower base member (5) in a direction away from each other in the vertical direction to press each base member (4, 5) against the inner surface of the sheath pipe (S), a fixing member (2) having the biasing member (6), a pipe pushing means (3) provided on the fixing member (2) for pushing the new pipe (P) in the pipe axis direction, and a hanging portion (10) provided on the upper base member (4) to which a hanging jig (9) for hanging the pipe body is attached. By the pipe pushing means (3) of the pipe joining device (1), an insertion step of pushing the insertion port of the new pipe (P) arranged behind into the receiving port of the preceding pipe (P') arranged in front to a predetermined position and inserting it, a removal step of lifting the receiving port of the new pipe (P) by the hanging jig (9) attached to the hanging portion (10) of the pipe joining device (1) and removing a pipe transporting member for transporting the new pipe (P) from below the new pipe (P), characterized by comprising the above steps.

9. The pipe joining method according to claim 8, wherein when the receiving port of the new pipe (P) arranged behind is lifted in the removal step, the hanging portion (10) is located on the back side in the pipe axis direction from the end face of the receiving port.

Images