JP6400557B2 - Tube lifting device and tube lifting / lowering method - Google Patents

Description

  This invention is used in a construction method in which pipes for fluid transportation used in waterworks, gas, sewers, etc. are arranged in existing sheath pipes, and a new pipe arranged in the sheath pipes is placed on the traveling carriage and placed in the sheath pipes. The present invention relates to a pipe lifting device for lifting a new pipe when it is carried in and a traveling carriage is removed at a predetermined place, and a method for lifting and lowering the pipe.

  As a method of embedding various fluid transport pipes such as ductile cast iron pipes in the ground, pipes newly established by propulsion and shield methods etc. are used as sheath pipes (sheath pipes), and new pipes such as ductile cast iron pipes ( Hereinafter, a method of simply arranging “new pipe”) may be employed. In some cases, an existing pipe already in service is used as a sheath pipe, and a new pipe having a small diameter is inserted therein to renew the pipe.

In this type of construction method, a traveling carriage is attached to the new pipe. The traveling carriage is provided with wheels, and the rolling of the wheels allows the new pipe to travel in the sheath. For this reason, the new pipe travels in the sheath pipe by towing and propulsion by the work vehicle and is transported to a predetermined location (see FIG. 1 of the present application).
When the traveling carriage is removed after the new pipe has been transported to a predetermined location, the new pipe is temporarily lifted and lowered (hereinafter referred to as “lifting” as appropriate, including both). There is a need. Therefore, a pipe lifting / lowering device (hereinafter referred to as “lifting device”) is used in the sheath.

  As the pipe lifting means, for example, a new pipe is lifted by a crane, or a new pipe is lifted by a hydraulic jack through a portal base. The tube lifting device using the portal base or the like includes a portal-shaped base that is arranged so as to rise from the bottom surface of the sheath tube, and a vertical support column provided at the center of the base. The base includes legs at both ends of the beam member in the lateral direction. The strut is placed so as to intersect the tube axis of the new pipe, and the new jack is lifted by pushing up the inner surface of the top of the new pipe with the hydraulic jack provided along the strut, and the carriage is pulled out from below the new pipe (Patent Document 1).

JP 59-77184 A

  A pipe lifting device using this type of portal base is effective when a large working space can be secured in the sheath. However, there is a problem that the working space is not suitable for construction in a small diameter sheath or pipe. The same applies when using a crane.

  This invention makes it a subject to lift / lower a pipe | tube by the method different from the past under the above actual condition.

In order to solve the above-mentioned problems, the present invention fixes a member different from the member constituting the sheath tube to the upper part of the inner surface (ceiling surface) of the sheath tube, and lifts and lifts the new tube with the member as a supporting point. I tried to keep it down.
Specifically, a horizontal base member is bridged between the inner surfaces of the sheath pipes, and a pressing means in the vertical direction of the new pipe is provided in the middle of the base member. A jig that is inserted into the linear body by pressing the suspension base against the inner surface of the radial sheath and guiding the linear body from the suspension base to the edge (periphery of the end surface) of the new pipe. The linear body is expanded and contracted to lift and lower the new tube.

In this configuration, the suspension base is fixed to the inner surface of the sheath by pressing, so even if the inner surface is a flat surface with no irregularities, such as a fume tube (the linear body is locked). Even if there is no part), the suspension base can be easily fixed.
Moreover, since it is easy to make the base member, the suspension base, and the pressing means large enough to fit in the sheath, it is not necessary to secure a wide working space in the sheath.
The “linear body” may be any wire as long as it can be used in the present invention, such as a wire made of a steel wire or the like, or a wire or chain made of an equivalent plastic wire or the like.

Further, the guiding part of the linear body to the new pipe may be any edge as long as the new pipe can be lifted, for example, the vertical direction of the circumferential surface of the end surface of the new pipe ( The upper and lower ends, the lower end, the intermediate portion or the upper and lower ends and the intermediate portion, etc. of the upper and lower direction central axis), and the aspect thereof is not the upper or lower end in the vertical diameter direction of the new pipe, The upper and lower diameter sides of the new pipe, both the upper and lower ends of the new pipe in the upper and lower radial direction, and either the upper and lower sides of the new pipe, or the upper and lower radial directions of the new pipe For example, both sides of the upper and lower sides, and both sides of the intermediate portion in the vertical direction of the new pipe can be used.
At this time, if the direction in which the linear body is guided is set to the vertical direction (on the central axis) of the new pipe or is symmetric with respect to the vertical direction, the new pipe is straight unless an unnecessary external force is applied. Lifted / lowered.

In these configurations, the suspension base is a member that is long in the circumferential direction of the sheath tube, the suspension base is pressed by the pressing means in the middle in the length direction, and the line is extended from both ends of the suspension base. The shape can be guided. If it does in this way, a new pipe will be lifted with two linear bodies, and the operation will become smooth.
In addition, the suspension base is a member that is long in the length direction of the sheath tube, and is pressed by a pressing means in the middle of the length of the suspension base, and is linear from one end in the length direction of the suspension base. It is also possible to guide the body and lift the new tube through the linear body so that the other end in the length direction becomes a fulcrum.

  In order to solve the above-described problems, a specific configuration of the pipe lifting device according to the present invention includes a horizontal base member spanned between the inner surfaces of the sheath pipes and upper and lower sides of a new pipe provided on the base member. Radial pressing means, a suspension base pressed against the inner surface of the sheath by the pressing means, a linear body that is guided from the suspension base to the edge of the new pipe, and the wire The structure which has a jig | tool which expands-contracts a shape body is employable.

With this configuration, as described above, there is an advantage that the hanging base can be easily fixed even if the inner surface is a flat surface with no unevenness like a fume tube.
Further, the suspension base is a member that is long in the circumferential direction of the sheath tube, the suspension base is pressed by the pressing means in the middle of the length direction, and the linear body is guided from both ends of the suspension base. Or a member that is long in the length direction of the sheath tube, pressed by the pressing means in the middle of the length direction of the suspension base, and the linear body is guided from one end in the length direction of the suspension base, The other end in the length direction can be a fulcrum.

  Since the present invention is configured as described above, it is possible to lift a new pipe with a configuration that has not existed in the past.

Schematic explanatory drawing of one Embodiment of the method of pulling out the trolley | bogie using the pipe lifting apparatus of this invention It is an enlarged view of the embodiment, (a) is a longitudinal sectional view, (b) is a right cut side view of (a) An example of the suspension base of the embodiment is shown, (a) is a plan view, (b) is a front view. An exploded front view of an example of the pressing means of the embodiment Main part enlarged schematic view of the same embodiment Action explanatory diagram of the same embodiment Perspective view of another example of the hanging base Illustration of laying a new pipe in the sheath Expanded longitudinal sectional view of other embodiments Further, an enlarged longitudinal sectional view of another embodiment

  1 to 7 show an embodiment according to the present invention. As shown in FIG. 1, this embodiment is provided in a sheath pipe P ′ embedded in a ground such as a steel pipe or a concrete pipe (fume pipe). Then, a new pipe P such as a ductile cast iron pipe is transported to a predetermined location in the sheath pipe P ′, and the new pipe P is sequentially connected to construct a pipe line. The connection is made by a joint structure in which the insertion port 1 of the succeeding (transported) new tube P is inserted into the receiving port 2 of the preceding new tube P and joined together. In some cases, the receiving port 2 of the succeeding new tube P is fitted to the insertion port 1 of the preceding new tube P and joined together.

  When the new pipe P is brought into the sheath P ', the traveling carriage 3 is attached to the bottom of the new pipe P. The traveling carriage 3 is provided with a frame 3a that supports the bottom of the new pipe P, and a rotatable wheel 3b on the frame 3a. If the new pipe P is placed on the underframe 3a, the new pipe P can travel in the sheath pipe P 'by the rotation of the wheel 3b. For example, as shown in FIG. 1, the new pipe P is transported by connecting a working vehicle 4 and a traveling cart 3 that are driven by a driving force with a connecting member 5, and the working vehicle 4 is placed on the traveling cart 3. Promote new pipe P. The traveling carriage 3 and the work vehicle 4 travel on the rail R in the sheath P '. In the figure, M is an operator.

  Further, when connecting the succeeding new pipe P to the preceding new pipe P, one end of the transported new pipe P is lifted by the pipe lifting device A, and in this state, the work vehicle 4 passes through the connecting material 5 to the traveling carriage 3. Is pulled out from under the new pipe P, and the traveling carriage 3 is removed from the new pipe P. When the traveling carriage 3 is detached from the bottom of the new pipe P and reaches a predetermined position, the pipe lifting apparatus A interposes the new pipe P in the sheath pipe P ′ with a base (not shown) interposed. Place.

  In addition, the form of the joint part between new pipes P is suitably selected according to the use and specification of a pipe line. For example, a protrusion is provided at the tip of the insertion port 1 and a lock ring is provided on the inner surface of the receiving port 2. After inserting the insertion port 1 into the receiving port 2 with a rubber ring or the like interposed therebetween, a rubber ring is formed by a push ring. The structure etc. which pushed and sealed in the gap | interval between the insertion port 1 and the receiving port 2 are employ | adopted.

  As shown in FIGS. 1 and 2, the pipe lifting device A includes a horizontal base member 10 spanned between the inner surfaces of the sheath pipe P ′, and a vertical diameter direction of a new pipe P provided on the base member 10 ( (Pressing means 30 in the vertical center axis direction) c, the suspension base 20 pressed against the inner surface (ceiling) of the sheath pipe P ′ by the pressing means 30, and the new pipe P from the suspension base 20 A linear body 40 guided and fixed to the lower end side in the vertical diameter direction c, a jig 50 for expanding and contracting the linear body 40, and the lower end of the linear body 40 at the edge of the new tube P ( The clamp 60 is fixed to the peripheral edge of the end surface.

The base member 10 is made of H-shaped steel 11 and has a length equal to or less than the diameter of the sheath tube P ′, and can be bridged horizontally in the sheath tube P ′. Thus, it is ensured that there is no hindrance to the post-process such as the traveling carriage 3 can pass through the space S.
The base member 10 may be an upward arc-shaped arch member. When this arch member is used, when a load is applied to the central portion in the arch axis direction, the reaction force from the sheath pipe P ′ acts so as to compress between the end portions 12 and 12 of the base member 10. For this reason, the pressing force works effectively with the reaction force of the compression force. Further, when the traveling carriage 3 is pulled out from under the new pipe P, the space S is wider when the arch member is used than when the linear member is bridged between the inner surfaces of the sheath P '. The span (length) of the base member 10 can be shortened. Thereby, the moment which acts on the base member 10 can be made small. Moreover, the enlargement of a member can be suppressed. Instead of the H-shaped steel 11, a steel material having another cross-sectional shape such as a steel material having a C-shaped cross section may be used. Furthermore, although a metal member is usually used, other materials other than metal may be used as long as there is no problem in strength.
Both ends 12 of the base member 10 are preferably shaped along the arc direction of the inner surface of the sheath P 'at the support point so that the both ends 12 of the base member 10 are firmly supported by the inner surface of the sheath P'.

As shown in FIG. 3, the suspension base 20 is a member that is long in the circumferential direction of the sheath tube P ′, and is fixed to the plate material 21 having a U-shaped cross section and to both ends of the plate material 21 by welding or the like. It consists of flat plate pieces 22 and 22. The plate member 21 is formed in an arc shape (arch shape) along the peripheral surface of the sheath P ', and a left-hand screw shaft 23 is erected on the lower surface of the center by welding or the like. One suspension hole 24, 24 is formed symmetrically with respect to the screw shaft 23 at both ends of both side plates 21 a of the plate material 21.
At both ends of both plate pieces 22, other suspension holes 25, 25 are formed symmetrically with respect to the center line (screw shaft 23). The reason why the suspension holes 25 are formed in both the plate pieces 22 and 22 is to prevent any trouble even if the left and right plate pieces 22 are on the end side of the new pipe P. For this reason, both plate pieces 22 and 22 are also symmetrical with respect to the screw shaft 23.

As shown in FIGS. 2 and 4, the pressing means 30 includes a circular pipe 31, a left-handed nut 32 a secured to one end thereof by welding or the like, and a right-handed screw secured to the other end by welding or the like. It consists of a nut 32b, a right screw shaft 33 screwed into the lower nut 32b, and a screw 34 screwed into the right screw shaft 33. As shown in FIG. 2, the lower portion of the right screw shaft 33 is applied to the upper surface between the flanges of the base member 10, and the screw 34 is screwed into the right screw shaft 33 from the lower surface of the rib of the base member 10. The right screw shaft 33 is firmly erected.
When the nuts 32a and 32b at both ends of the circular tube 31 are screwed into the right screw shaft 33 and the left screw shaft 23 of the suspension base 20, a turnbuckle structure is formed. The length between 23 and 33 expands and contracts.
The screw shaft 23 and the nut 32a may be a right-hand thread, and the screw shaft 33 and the nut 32b may be a left-hand thread.

As shown in FIGS. 2 and 5, the linear body 40 is provided with a jig for expanding and contracting the linear body 40, the upper side is made of a nylon sling 41, and the lower side is a lever block that forms the jig ( (Registered trademark) 50 chain 51. The nylon sling 41 is optional with a chain, a metal linear body, another resin linear body, or the like as long as it has a strength that does not hinder the following lifting.
As shown in FIG. 2, the nylon sling 41 is passed through the holes 25 on both sides of one plate piece 22 or the holes 24 of the plate material 21, and then locked to the hooks 52 of the lever block 50. The nylon sling 41 can also be locked in the holes 24 and 25 via shackles. Further, the hooks 52 of the lever block 50 can be directly locked in the holes 24 and 25.
The lever block 50 has a conventionally well-known structure shown in FIG. 5, and the chain 51 is fed (unwinded) or wound (wound up) by rotating the lever 54 with respect to the main body 53 as shown by an arrow. .

  As shown in FIG. 5, the clamp 60 is a giant vise comprising a U-shaped main body 61, a fastening shaft 62 threaded through one flange of the main body 61, and a handle 63. The clamp 61 is fixed (fastened) to the edge p by fitting the main body 61 to the edge p of the new pipe P and pressing the tip of the fastening shaft 62 against the inner surface of the end of the new pipe P with the handle 63. A hook 55 at the tip of the chain 51 of the lever block 50 is locked to the locking ring 64 of the clamp 60 that is fixed.

The tube lifting device A of this embodiment has the above-described configuration. Now, in the sheath tube P ′ of FIG. 1, the insertion port 1 of the succeeding new tube P is inserted into the receiving port 2 of the preceding new tube P. In the temporarily connected state, as shown in FIG. 2 and FIG. 2, first, the base member 10 is bridged horizontally between the inner surfaces of the sheath pipes P ′, and pressing means (turns) is turned in the middle of the base member 10. The buckle 30 is fixed, and the suspension base 20 is pressed against the inner upper surface (ceiling surface) of the sheath P ′ by the means 30.
At this time, one side plate 21a (close to the new pipe P) of the suspension base 20 is positioned so that the suspension hole 25 is located behind the end face of the new pipe P as shown in FIG. .

Next, the nylon sling 41 is passed through and locked to the suspension holes 25 and 25 at both ends of the plate piece 22 of the suspension base 20, and the nylon sling 41 is locked to the hook 52 of the lever block 50. At this time, since the suspension hole 25 is located on the back side (left side in FIG. 2A) from the end surface of the new pipe P, the nylon sling 41 abuts on the end surface of the new pipe P and is rearward (backward) from the end surface. The new pipe P is pushed backwards and hung up while preventing rotation of the new pipe P. For this reason, there is very little possibility that the insertion slot 1 will come off from the receptacle 2. The nylon sling 41 may be locked by passing through the suspension holes 24 and 24 of the side plate 21a of the plate 21 of the suspension base 20, respectively.
Further, the clamp 60 is fixed at symmetrical positions on both sides below the central axis c in the vertical direction at the end of the new pipe P, and the hook 55 at the tip of the chain 51 of the lever block 50 is locked to the locking ring 64 of the clamp 60.

In this state, as shown in FIG. 2 (b), the turnbuckle (pressing means) 30 is on the central axis (vertical diameter direction) c in the vertical direction of the new pipe P, and both sides of the central axis c are symmetrical. In the position, the linear body 40 reaches both sides of the inner surface of the sheath tube P ′ to both sides of the lower end surface of the new tube P. When the chain 51 is wound up by the lever block 50, the new tube P is formed with respect to the suspension base 20. Ascend and leave the carriage 3.
At this time, as shown in FIG. 6, the suspension base 20 has one end of the other plate piece 22 as a fulcrum O, a moment M1 = F1 × L1 due to the suspension force F1 by the lever block 50, and suspension by the turnbuckle. The moment M2 = F2 × L2 due to the force F2 pressing the lowering base 20 against the inner surface of the sheath P ′ acts, and if the pressing force F2 due to the turnbuckle 30 is applied so that M1 = M2, the rotation of the hanging base 20 Can be easily prevented. For this reason, if the length in the axial direction (tube axis direction) of the new pipe P of the suspension base 20 is appropriately set, the suspension holes 24 and 25 can be formed at arbitrary positions in the axial direction. The hanging position of the linear body 40 can be set to the optimum position. This action can be exerted even when the nylon sling 41 is locked in any of the suspension holes 24 and 25 of the suspension base 20.
Further, as shown in FIG. 8, even if the new pipe P is a curved pipe P ₁ such as a U-shaped pipe, the new pipe P is firmly suspended on both sides of the central axis c of the new pipe P ₁ ( since lifting) are new pipe P ₁ is rotated or break the balance, it is very small or to swing.

If the new pipe P is lifted, the traveling carriage 3 is pulled out from below the new pipe P in the same manner as in the past, and if the traveling carriage 3 is detached from under the new pipe P and reaches a predetermined position, Then, the lever block 50 is operated, and the new pipe P is placed at a predetermined height at the bottom of the sheath pipe P ′ via the receiving base, and the operation is completed.
Thereafter, the pipe lifting device A is disassembled, and the process proceeds to the next process of connecting the new pipe P.

In this embodiment, the tube lifting device A is provided on the receiving port 2 side, but depending on the orientation of the new tube P in the sheath tube P ′, it may be provided on the insertion port 1 side.
Further, the mode of the traveling carriage 3 is not limited to this embodiment, and various types may be used as long as the carriage 3a that supports the bottom of the new pipe P and the carriage 3b that is provided with a rotatable wheel 3b are provided. Can be used.

In the above embodiment, the new pipe P is lifted up and down on both sides of the central axis c of the new pipe P. However, as shown in FIG. Or lifted at one location on the upper or lower end of the central axis c as shown in FIG. 4B, or one upper location on the central axis c as shown in FIG. It can be lifted at two places on the lower side.
In these cases, since the lifting force or the resultant force is on the central axis c of the new pipe P, the new pipe P hardly rotates or swings unless an external force is applied. In particular, in the case of (a) and (c) in the same figure, the suspending force (lifting force) applied to the two linear bodies 40 becomes a couple, so that the swinging or the like is very small.
Further, when lifting with two linear member 40, it is possible to adjust each lifting force of the each linear member 40 at lever block 50, the new pipe P is a weight tube asymmetric a bent tube P ₁ However, since the linear body 40 can be lifted while controlling the rotation around the axis, it is possible to prevent inadvertent rotation. This action is performed not only when the new pipe P is lifted, but also after the traveling carriage 3 is pulled out, a receiving base on which the receiving port 2 is placed is placed on the bottom side of the new pipe P, and the receiving port 2 is placed on the receiving base. The same applies to the pipe connection when the new pipe P is lowered while being centered.
Furthermore, by arbitrarily separating the suspension holes 24 and 25 on both sides in the axial direction of the new pipe P, the rotation of the suspension base 20 can be easily suppressed from the relationship between the moments M1 and M2.

  Further, as shown in FIG. 10, clamps 60 are fixed at two places on the upper (upper) left and right sides of the central axis c of the edge p of the new pipe P (FIG. 10A), or the edge p of the new pipe P The clamp 60 is fixed to the center left and right two places of the central axis c (FIG. 5B), and the linear body 40 is guided from the clamps 60, 60 to the suspension base 20 via the lever block 50, It can be lifted (lifted) at two places on the upper side or central left and right sides of the new pipe P. In this case, even if it is lifted only at the two left and right positions (FIGS. (A) and (b)), as shown in FIG. It may be hung up, or it may be hung up at four places in addition to the two places on the lower side of the central axis c of the new pipe P shown in FIG. The number of lifting (supporting points of the hanging base 20 and the new pipe P) may be four (points) or more. That is, it is arbitrary. In those cases, the upper and lower support points (holes 24 and 25, locking ring 64) of the linear body 40 are symmetrical with respect to the pressing point by the pressing means 30 and the vertical direction (center line c) of the new pipe. Position.

Since the suspension base 20 has an H shape in plan view, the suspension base 20 can be lightweight and inexpensive. However, as shown in FIG. 7A, the plate piece 22 protrudes from the end of the side plate 21a of the plate material 21. As shown in FIG. 5B, various forms can be adopted as long as they exhibit the same action as a box or the like. The suspension base 20 of each aspect can be reduced in weight in the order of FIGS. 7B, 3 and 7A. The pressing means 30 is not limited to the turnbuckle type, and various modes can be adopted as long as the same function such as a hydraulic jack or a screw jack is exhibited.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

A pipe lifting device P new pipe P 'sheath pipe P ₁ U-shaped pipe p new pipe edge 1 insertion slot 2 receiving port 3 traveling carriage 4 work vehicle 5 connecting material 10 base member 11 H-shaped steel 20 of base member Base 21 Suspension base U-shaped plate material 22 Same plate pieces 24, 25 Linear body suspension hole 30 Pressing means (turn buckle)
31 Cylinders 32a and 32b of pressing means Same nuts 23 and 33 Same screw shaft 40 Linear body 41 Nylon sling 50 Linear body expansion and contraction jig (lever block)
51 Linear body expansion / contraction jig chain 52 Hook 53 Linear body expansion / contraction jig body 54 Lever 55 Hook 60 Linear body fixing means (clamp)
61 U-shaped body of linear body fixing means 62 Same fastening shaft 63 Same handle 64 Same locking ring

Claims (6)

A pipe lifting device (A) that lifts the new pipe (P) when the traveling carriage (3) on which the new pipe (P) is placed and travels in the sheath pipe (P ') is removed from the new pipe (P). Because
A horizontal base member (10) spanned between the inner surfaces of the sheath pipe (P ′), and a pressing means (c) in the vertical diameter direction (c) of the new pipe (P) provided on the base member (10) 30), a suspension base (20) pressed against the inner surface of the sheath tube (P ′) by the pressing means (30), and the suspension base (20) to the edge of the new tube (P) A pipe lifting device having a linear body (40) guided and fixed, and a jig (50) for expanding and contracting the linear body (40).   The suspension base (20) is a member that is long in the circumferential direction of the sheath pipe (P ′), and the suspension base (20) is halfway along the length of the sheath base (20) by the pressing means (30). 2. The linear body (40) is pressed against the inner surface of (P ′), and the linear bodies (40) are respectively guided to the edge of the new pipe (P) from both circumferential ends of the suspension base (20). The tube lifting device described.   The suspension base (20) is a member that is long in the length direction of the sheath tube (P ′), and the suspension base (20) is halfway in the length direction by the pressing means (30). Pressed against the inner surface of the pipe (P ′), the linear body (40) is led from one end in the length direction of the suspension base (20) to the edge of the new pipe (P), and the linear shape The pipe lifting device according to claim 1 or 2, wherein when the new pipe (P) is lifted through the body (40), the other end in the length direction becomes a fulcrum (o). When the traveling carriage (3) on which the new pipe (P) is placed and travels in the sheath pipe (P ') is removed from the new pipe (P), the pipe is raised and lowered. And
A horizontal base member (10) is bridged between the inner surfaces of the sheath pipes (P ′), and a pressing means (c) in the vertical direction (c) of the new pipe (P) is placed in the middle of the base member (10). 30), and the suspension means (30) presses the suspension base (20) against the inner surface of the sheath pipe (P ′) in the vertical diameter direction (c) of the new pipe (P). A linear body (40) is guided and fixed from the base (20) to the edge of the new pipe (P), and the linear body (40) is secured by a jig (50) interposed in the linear body (40). A pipe lifting / lowering method in which the new pipe (P) is lifted / lowered by expanding and contracting.   The suspension base (20) is a member that is long in the circumferential direction of the sheath tube (P ′), and the suspension base (20) is pressed by the pressing means (30) in the middle in the length direction, The pipe lifting / lowering method according to claim 4, wherein the linear body (40) is led from both ends of the suspension base (20) to an edge of the new pipe (P).   The suspension base (20) is a member that is long in the length direction of the sheath tube (P ′), and the suspension base (20) is pressed by the pressing means (30) in the middle in the length direction. The linear body (40) is guided from one end in the length direction of the suspension base (20) to the end edge of the new pipe (P), and the other end in the length direction becomes a fulcrum (o). The pipe lifting / lowering method according to claim 4 or 5, wherein the new pipe (P) is lifted / lowered via the linear body (40).

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