JP2020090077A - Existing pipe re-creation structure and existing pipe re-creation method - Google Patents

Abstract

To provide a re-creation method of an existing pipe which can sufficiently utilize the stretching function of a re-creation pipe including a strip-shaped member having a stretching part.SOLUTION: There is provided a re-creation method of an existing pipe, in which a re-creation pipe 3 is produced by spirally winding a strip-shaped member 10 along an inner circumference of an existing pipe 1, and by joining together adjacent edge portions 13, 14. A restraining pipe portion 3a of the re-creation pipe 3 is restrained with respect to the existing pipe 1, and a stretchable pipe portion 3b is brought into a non-restrained state or a weakly restrained state. In the pipe producing step, at least stretchable pipe portion 3b is produced by the strip-shaped member 10 having a stretchable portion 15 capable of stretching in a strip width direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to an existing pipe rehabilitation structure and an existing pipe rehabilitation method, which are performed by rehabilitating an aged existing pipe, and particularly to an existing pipe rehabilitation structure and an existing pipe rehabilitation method including a spiral tubular rehabilitation pipe along an inner circumference of the existing pipe. Regarding

A method of rehabilitating an existing pipe by winding a strip-shaped member along an inner peripheral surface of an existing pipe such as an aged sewer pipe to manufacture a spiral tubular rehabilitating pipe is known.
For example, in the existing pipe rehabilitation structure of Patent Document 1, the rehabilitation pipe has a two-strand spiral band structure including a strip body (strip) and a connection strip (joiner), and the connection strip (joiner) expands and contracts in a bellows shape. Section is provided. When an earthquake motion occurs, the expansion and contraction part expands and contracts in the band width direction, and the rehabilitation pipe expands and contracts in the pipe axis direction, thereby maintaining watertightness.

Japanese Patent No. 3804955

In the existing pipe rehabilitation structure of the above-mentioned patent document 1, the backfill material such as cement milk is filled in the entire area between the existing pipe and the rehabilitation pipe. Therefore, the stretchable portion of the strip-shaped member is bound to the existing pipe through the backfill material over the entire region. For this reason, when a ground movement such as an earthquake occurs, expansion and contraction deformation occurs only at the location where the backfill material is cracked, and the expansion and contraction function cannot be fully utilized.
In view of such circumstances, it is an object of the present invention to provide an existing pipe rehabilitation structure and an existing pipe rehabilitation method capable of fully utilizing the expansion and contraction function of a rehabilitation pipe including a strip-shaped member having an expansion and contraction portion.

In order to solve the above-mentioned problems, the structure of the present invention comprises a spiral tubular rehabilitation pipe extending along the inner circumference of an existing pipe, wherein the rehabilitation pipe is spirally wound and is displaced by one turn from both edges in the band width direction. An existing pipe rehabilitation structure composed of a strip-shaped member in which adjacent edge portions are joined together,
The rehabilitating pipe is provided with a restrained pipe portion restrained with respect to the existing pipe and a stretchable pipe portion in a non-restrained state or weakly restrained state with respect to the existing pipe, which are separated in the pipe axial direction. ,
In the band-shaped member, at least a portion of the restrained tube section and the expandable tube section that constitutes the expandable tube section has an expandable section that can expand and contract in the band width direction.

Here, the non-restrained state means that the expandable tube portion is not restrained by the existing pipe at all, or is almost or substantially not restrained. The weakly restrained state means that the expandable tube portion is restrained weaker than the restrained pipe portion by the existing pipe. The expansion and contraction of the expansion and contraction part means that the expansion and contraction part can be deformed in both the extension direction and the contraction direction based on the initial state when the strip-shaped member is manufactured or when the rehabilitation pipe is put into service. It also includes that it can be deformed in only the most contracted state and can be deformed only in the stretching direction, and that it can be deformed in both the stretching direction and the contracting direction in a state of being stretched from the initial state.
In the existing pipe rehabilitation structure, when an external force is applied due to ground movement such as an earthquake, the expandable part of the expandable tube part can be expanded and contracted without being blocked by the existing pipe, and the expansion and contraction function of the expandable part can be fully utilized. You can
More specifically, the expansion and contraction of the expandable part of the expandable tube part absorbs the energy of ground movement such as an earthquake, and prevents the adjacent edge portions of the strip-shaped member from being separated from each other. As a result, a fluid such as sewage can be prevented from leaking from between the adjacent edge portions, and the flow-down performance can be maintained. On the other hand, by restraining the restricted pipe portion of the rehabilitation pipe by the existing pipe, it is possible to prevent or suppress the rehabilitation pipe from being displaced with respect to the existing pipe as a whole. Further, as described above, since the ground fluctuation energy is absorbed by the expandable tube section, the ground fluctuation energy applied to the restrained pipe section and its restraining means can be reduced, and the restrained state of the restrained pipe section can be reliably retained. it can.

It is preferable that the restricted pipe portion has a larger diameter than the expandable pipe portion.
It is preferable that the large-diameter constrained pipe portion is pressed against substantially the entire circumference of the inner peripheral surface of the existing pipe. As a result, the restrained pipe portion can be surely brought into a restrained state with respect to the existing pipe.
It is preferable to separate the expandable and contractible pipe portion having a small diameter from the inner peripheral surface of the existing pipe. As a result, the expandable tube portion can be reliably brought into the unconstrained state or the weakly restrained state with respect to the existing pipe.

It is preferable that the lead angle of the spiral in the constrained tube section is smaller than the lead angle of the spiral in the expandable tube section. It is preferable that the spiral pitch in the constrained tube section is smaller than the spiral pitch in the expandable tube section.
As a result, the diameter of the constrained tube section can be made larger than that of the expandable tube section.

A plurality of rows of concave grooves are formed on at least one edge of both edges of the strip-shaped member, and a plurality of rows of ridges are formed on at least the other edge of both edges. The ridges and grooves corresponding to each other in the adjacent edge portions are fitted together,
Furthermore, it is preferable that a part of the plurality of rows of ridges is cut at the root portion.
As a result, after the pipe to be restrained has the same diameter as the expandable pipe, the adjacent pipes of the restrained pipe are slid so as to be displaced from each other along the winding direction. The length of one roll of the section can be expanded to increase the diameter of the restricted pipe section.

It is preferable that some of the ridges are joined to the corresponding groove via an adhesive and that the ridges other than the one are joined to the corresponding groove via a slip agent that allows sliding. ..
Preferably, the cutting is performed after the rehabilitation pipe is manufactured. By doing so, at the time of pipe manufacturing, the joint strength between the adjacent edge portions can be obtained, and the pipe can be stably manufactured. After that, by performing the cutting, the bonding strength between the adjacent edge portions is weakened. Moreover, since a sealant that allows slippage is provided between the uncut ridge and the groove, the expanding operation can be easily performed.
In the rehabilitation pipe, the part in which the part of the ridges is cut may be only the constrained pipe part of the constrained pipe part and the expandable/contractible pipe part. Both of the expandable and retractable pipe portions may be provided, and the part of the ridges may be cut over substantially the entire area of the rehabilitation pipe.

It is preferable that a portion of the rehabilitation pipe provided at an end portion of the existing pipe is the restricted pipe portion.
As a result, the rehabilitating pipe and the existing pipe can be restrained from each other, and the middle part of the rehabilitating pipe can be made expandable and contractible so as to have elasticity.

The restricted pipe portion may be formed to protrude from an end portion of the existing pipe and have a diameter larger than an inner diameter of the existing pipe.
As a result, the projected restricted pipe portion can be locked by being locked to the end portion of the existing pipe.

It is preferable that a portion of the rehabilitation pipe provided at a connection portion of the existing pipe with the branch pipe serves as the restricted pipe portion.
Accordingly, even if the expandable tube portion is expanded and deformed, the inside of the rehabilitation tube and the branch tube can be maintained in a communicating state.
Examples of the branch pipe include an attachment pipe when the existing pipe is a sewer pipe.

It is preferable that a communication port communicating with the branch pipe is formed in the restricted pipe portion of the connection portion, and the communication port is a long hole having a long axis oriented in the pipe axis direction.
As a result, even if the expandable tube part is expanded and contracted in the axial direction of the tube, the communication between the inside of the rehabilitating tube and the branch tube can be reliably maintained.
The ratio of the major axis (dimension in the major axis direction) to the minor diameter (dimension in the minor axis direction) of the communication port is preferably about 1.2:1 to 3:1.

It is preferable that the existing pipe rehabilitation structure includes a restraining means that restrains the restrained pipe portion to the existing pipe.
As a result, the restricted pipe portion can be surely restricted to the existing pipe. It is preferable that the restraint means restrains only the restrained pipe portion of the restrained pipe portion and the expandable/contractible pipe portion to the existing pipe.

The restraint means includes a filler filled between the inner peripheral surface of the existing pipe and the constrained pipe portion, and there is a gap between the inner peripheral surface of the existing pipe and the expandable pipe portion. It is preferably formed.
By the filler, the constrained pipe portion can be surely constrained to the existing pipe. Moreover, the expandable part of the expandable tube part can be expanded and contracted by surely setting the expandable tube part in the unrestrained state or the weakly restricted state.
Examples of the filler include an adhesive, a sealant, and a backfill material.
The void is preferably a low-viscosity fluid layer such as an air layer. It is preferable that the inner peripheral surface of the existing pipe and the expandable/contractible pipe portion are separated from each other over substantially the entire circumference. It is preferable that the expandable tube portion has a diameter smaller than the inner diameter of the existing tube.

It is preferable that an outer peripheral groove is formed on the outer periphery of the rehabilitating pipe, and the filler is filled only in the outer peripheral groove of the constrained pipe of the constrained pipe and the expandable pipe.
As a result, the constrained pipe portion can be securely constrained to the existing pipe through the filler. In addition, a gap can be formed between the expandable tube section and the existing tube.

It is preferable that an injection tube having an injection hole for the filler is provided on the outer periphery of the constrained tube portion, and the injection tube is embedded in the filler.
After the rehabilitation pipe is manufactured, a filler is supplied to the injection tube. The filler is discharged from the injection hole. As a result, the filler can be filled between the inner peripheral surface of the existing pipe and the restricted pipe portion.
It is preferable that the filler is provided only between the constrained pipe portion and the existing pipe of the constrained pipe portion and the expandable/contractible pipe portion.

The restraint means may include an anchor bolt.
Preferably, the anchor bolt is driven into the existing pipe through the restricted pipe portion. As a result, the restricted pipe portion can be surely restricted to the existing pipe.
It is preferable that the anchor bolt is provided only on the constrained pipe portion of the constrained pipe portion and the expandable/contractible pipe portion.

Both the constrained pipe part and the expandable/contractible pipe part are in contact with the inner wall of the existing pipe over the entire circumference thereof, and the restraint means applies only to the constrained pipe part of the constrained pipe part and the expandable/contractible pipe. It may be provided.
As a result, the restrained pipe portion can be surely restrained to the existing pipe, and the expandable pipe portion can be at least weakly restrained.

The method of the present invention is a method of rehabilitating an existing pipe with a spiral tubular rehabilitation pipe,
The band-shaped member is spirally wound along the inner circumference of the existing pipe, and the rehabilitating pipe is manufactured by joining the edge portions of the band-shaped members, which are adjacent to each other, with a gap of one edge. The process of pipe
A restraint pipe portion of the rehabilitation pipe is restrained with respect to the existing pipe, and an expandable pipe portion set separately from the restraint pipe portion of the rehabilitation pipe in the pipe axial direction is provided with respect to the existing pipe. A step of setting the unrestrained state or the weakly restrained state,
In the pipe making step, at least the expandable pipe part of the constrained pipe part and the expandable pipe part is made by a band-shaped member having an expandable part that can expand and contract in the band width direction.
This makes it possible to make full use of the expansion/contraction function of the expansion/contraction part of the expandable/contractible tube part. Moreover, the rehabilitation pipe as a whole can be prevented or suppressed from being displaced from the existing pipe.

It is preferable that the constraining step includes a step of expanding the diameter of the constrained pipe portion after the pipe manufacturing step as compared with during pipe manufacturing.
As a result, in the pipe manufacturing step, the rehabilitated pipe can be manufactured so as to have a diameter smaller than the inner diameter of the existing pipe as a whole. After that, by expanding the diameter of only the constrained pipe portion, the constrained pipe portion can be pressed against the inner peripheral surface of the existing pipe to be in the constrained state. The expandable tube portion can be brought into an unrestrained state or a weakly restrained state by holding the expandable tube portion with a diameter smaller than that of the existing tube.

It is preferable that the diameter expanding step includes a step of expanding the length of one winding of the belt-shaped member in the constrained tube portion.
Due to the expansion, the diameter of the constrained pipe portion can be expanded and pressed against the inner peripheral surface of the existing pipe to bring it into a constrained state.

In the expanding step, it is preferable that the rehabilitation pipe is twisted in a direction in which the length of one winding is expanded.
As a result, the length of one winding of the band-shaped member in the constrained pipe portion can be expanded, and the constrained pipe portion can be expanded in diameter.

A twisting force in the expanding direction is applied to a pipe portion on one end side of the rehabilitating pipe in the pipe axis direction from the constrained pipe portion or an end portion on the one end side of the constrained pipe portion. Preferably.
As a result, the length of one roll of the belt-shaped member in the restricted pipe portion can be surely expanded.
A twisting force may be applied to the strip-shaped member in the constrained pipe portion via the pipe portion on the one end side, or a twisting force may be directly applied to the end portion of the strip-shaped member in the constrained pipe portion. ..

In the twisting step, the tube portion on the one end side of the strip-shaped member or the strip portion of the unmade pipe continuing to the end portion on the one end side may be sent to the pipe portion on the one end side by a former press making machine. preferable.
The twisting force can be generated by feeding the strip portion of the unmade pipe.

It is preferable that the original press pipe making machine is slidable along the pipe axis direction.
Along with the expansion, the helical condition (lead angle, pitch, etc.) of the constrained tube portion changes, and the axial length of the constrained tube portion tends to shrink. At this time, by sliding the original press pipe making machine toward the constrained pipe portion, the contraction of the axial length of the constrained pipe portion can be permitted, and thus the expansion can be permitted. As a result, the diameter of the restricted pipe portion can be smoothly expanded.

In the expanding step, it is preferable that an end portion of the rehabilitation pipe on the side opposite to the one end side in the pipe axis direction is fixed to the existing pipe.
As a result, the length of one roll of the belt-shaped member in the constrained pipe portion can be reliably expanded, and the constrained pipe portion can be reliably expanded in diameter.

In the expanding step, it is preferable that the joining force between the adjacent edge portions of the strip-shaped member in the constrained tube portion is made weaker than that during pipe manufacturing.
Thereby, the adjacent edge portions of the restrained pipe portion can be easily slid so as to be displaced from each other along the winding direction. As a result, the length of one roll of the belt-shaped member in the constrained pipe portion can be easily expanded, and the constrained pipe portion can be easily expanded in diameter.

It is preferable that the joining force between the adjacent edge portions from the end portion of the rehabilitating pipe on the side opposite to the one end side in the pipe axial direction to the constrained pipe portion is made weaker than during pipe manufacturing.
As a result, the length of one winding of the band-shaped member in the constrained pipe portion can be easily expanded, and the constrained pipe portion can be easily expanded in diameter.

A plurality of rows of recessed grooves are formed on at least one edge of both edges of the strip-shaped member, and a plurality of rows of ridges are formed on at least the other edge of both edges. ,
In the pipe manufacturing step, fitting the mutually corresponding ridges and grooves in the adjacent edge portions,
After the pipe manufacturing step, it is preferable to cut a root portion of a part of the ridges in the plurality of rows of the ridges in the target portion of the rehabilitating pipe where the joining force is weakened.
As a result, in the pipe manufacturing step, the adjacent edge portions can be strongly fitted to each other to stably manufacture the rehabilitated pipe. In the expanding step, the convex strips other than the partial convex strips of the adjacent edges of the constrained pipe portion and the concave grooves corresponding to the convex strips can be easily slid so as to be displaced from each other along the winding direction. You can As a result, the length of one roll of the belt-shaped member in the constrained pipe portion can be easily expanded, and the constrained pipe portion can be easily expanded in diameter.

In the pipe manufacturing step, a wire is sandwiched between side portions of the root portion between the adjacent edge portions,
After the pipe making step, it is preferable that the root portion is cut by pulling the wire in the pipe axial direction.
As a result, it is possible to reliably cut the root portion of the part of the ridge.

In the pipe manufacturing step, while fitting the part of the convex stripes with the corresponding concave groove via an adhesive, the convex stripes other than the part with the corresponding concave grooves via a sealant that allows sliding. It is preferable to fit them.
As a result, in the pipe manufacturing step, the rehabilitating pipe can be stably manufactured by bonding the part of the ridges and the concave grooves. In the expansion step, the length of one roll of the belt-shaped member in the constrained pipe portion can be easily expanded by making the convex strips and the concave grooves other than the one of the convex strips slippery, and the constrained pipe portion can be easily expanded. Can be easily expanded in diameter. Further, the sealing agent can secure the sealing property of the rehabilitation pipe.

In the restraint step, a push-spreading unit may be arranged inside the constrained pipe section, and the push-spreading unit may push the constrained pipe section outward in the radial direction.
As a result, the length of one winding of the band-shaped member in the constrained pipe portion can be expanded, and the constrained pipe portion can be expanded in diameter. It is possible to press the constrained pipe part whose diameter has been expanded against the inner peripheral surface of the existing pipe to constrain it.

It is preferable to fill a filler between the restricted pipe portion and the existing pipe.
Thereby, the constrained pipe portion can be constrained to the existing pipe through the filler. The restraint step may include a step of filling the filler.
It is preferable that no filler is filled between the expandable tube and the existing tube.

On the outer periphery of the portion to be the constrained pipe portion in the strip-shaped member, pipe making with an injection tube having an injection hole arranged,
Then, it is preferable that the filler is discharged from the injection hole.
As a result, the filler can be easily filled between the constrained pipe portion and the existing pipe.

It is possible to manufacture the rehabilitating pipe in a state where the filler is provided on the outer periphery of the portion to be the constrained pipe portion in the strip-shaped member, and to stick the constrained pipe portion to the inner peripheral surface of the existing pipe. preferable.
The entire area of the rehabilitating pipe may be attached to the inner peripheral surface of the existing pipe by manufacturing the rehabilitating pipe so that the outer diameter of the rehabilitating pipe matches the inner diameter of the existing pipe. The rehabilitation pipe may be manufactured to have a diameter smaller than the inner diameter of the existing pipe, and then at least the restricted pipe portion may be expanded in diameter by the expansion operation or the like and attached to the inner peripheral surface of the existing pipe. Due to the sticking, the filler is sandwiched and filled between the inner peripheral surface of the existing pipe and the constrained pipe portion. The constrained pipe portion is constrained to the existing pipe by the filler.

In the restraining step, it is preferable that the restrained pipe portion is restrained with the existing pipe by an anchor bolt.
As a result, the restricted pipe portion can be surely restricted to the existing pipe.

According to the existing pipe rehabilitation structure and the existing pipe rehabilitation method of the present invention, it is possible to fully utilize the expansion/contraction function of the rehabilitation pipe including the strip-shaped member having the expansion/contraction portion.

FIG. 1 is a side sectional view of a rehabilitated pipe (existing pipe rehabilitation structure) according to the first embodiment of the present invention. FIG. 2A is a front sectional view of the rehabilitated pipe taken along the line IIa-IIa in FIG. FIG. 2B is a front sectional view of the rehabilitated pipe taken along the line IIb-IIb in FIG. 1. FIG. 3A is a cross-sectional view showing a strip-shaped member constituting the rehabilitated pipe of the rehabilitated pipe in a neutral state (non-expandable state). FIG. 3B is a sectional view showing the belt-shaped member in a state of being contracted in the belt width direction. FIG.3(c) is sectional drawing which shows the said strip|belt-shaped member in the state extended in the strip|belt width direction. FIG. 4 is an enlarged cross-sectional view of the circle IV of FIG. FIG. 5 is a cross-sectional view showing an example of the state of the rehabilitated pipe when the ground change occurs in FIG. 4. FIG. 6 is a sectional view of a rehabilitated pipe (existing pipe rehabilitation structure) according to the second embodiment of the present invention. FIG. 7 is an enlarged cross-sectional view showing an injection state of the filler in the second embodiment. FIG. 8 shows a third embodiment of the present invention and is a front sectional view of a rehabilitated pipe (existing pipe rehabilitation structure). FIG. 9 is a front cross-sectional view of a rehabilitated pipe (existing pipe rehabilitation structure) according to a modification of the third embodiment. FIG. 10 is a side sectional view of a rehabilitated pipe (existing pipe rehabilitation structure) according to the fourth embodiment of the present invention. FIG. 11A is a front sectional view of the rehabilitated pipe according to the fourth embodiment taken along the line XIa-XIa of FIG. 10. FIG. 11B is a front cross-sectional view of the rehabilitated pipe according to the fourth embodiment taken along the line XIb-XIb in FIG. 10. 12(a) to 12(d) are cross-sectional views showing modifications of the belt-shaped member. FIG. 13 is a side sectional view of a rehabilitated pipe (existing pipe rehabilitation structure) according to the fifth embodiment of the present invention. FIG. 14A is an enlarged cross-sectional view of the circular portion XIVa of FIG. FIG. 14B is an enlarged cross-sectional view of the circular portion XIVb of FIG. FIG. 15 is an enlarged cross-sectional view of the circle portion XV of FIG. FIG. 16 is a plan view taken along line XVI-XVI of FIG. FIG. 17 is a cross-sectional view of a joint portion between the first and second fitting portions of the rehabilitated pipe in the rehabilitated pipe according to the fifth embodiment. FIG. 18 is a sectional view showing a pipe manufacturing step in the fifth embodiment. FIG. 19: is sectional drawing which shows the fixing process of the arrival side edge part of the rehabilitation pipe in the said 5th Embodiment. FIG. 20 is a cross-sectional view showing a step of weakening the joining force of the joining portion of the restraint pipe portion on the arrival side of the rehabilitation pipe in the fifth embodiment. FIG. 21 is a front view taken along the line XXI-XXI of FIG. 20, showing the former-push pipe making machine installed in the starting-side (former-push side) manhole in the fifth embodiment. FIG. 22A is a cross-sectional view showing the joint portion before weakening the joint force. FIG. 22B is a cross-sectional view showing the joint portion when the joint force is weakened. FIG. 23 is a cross-sectional view showing an expansion process of the reaching-side constrained tube portion in the fifth embodiment. FIG. 24 is a cross-sectional view showing a step of weakening the joining force of the joining portion from the arrival side of the rehabilitating pipe to the intermediate constrained pipe portion in the fifth embodiment. FIG. 25 is a cross-sectional view showing a step of expanding the intermediate constrained tube portion in the fifth embodiment. FIG. 26 is a cross-sectional view showing a step of weakening the joining force of the joining portion from the middle of the rehabilitating pipe to the restrained pipe portion on the original pushing side in the fifth embodiment. FIG. 27 is a cross-sectional view showing a step of expanding the constrained tube portion on the original push side in the fifth embodiment. FIG. 28 is a cross-sectional view showing an example of construction of a strip-shaped member that serves as a restricted pipe portion in the fifth embodiment. FIG. 29 is a cross-sectional view showing an example of the state of the rehabilitation pipe when a ground change occurs in the fifth embodiment. FIG. 30 is a cross-sectional view showing a step of expanding the constrained tube portion according to the sixth embodiment of the present invention. FIG. 31: is sectional drawing which shows the expansion process of the restricted pipe part which concerns on 7th Embodiment of this invention. FIG. 32(a) is a cross-sectional view of the end portion of the rehabilitated pipe according to the eighth embodiment of the present invention. FIG. 32B is a cross-sectional view showing the step of expanding the protruding pipe portion that constitutes the restricted pipe portion in the eighth embodiment. FIG. 33(a) is a cross-sectional view of an end portion of a rehabilitated pipe according to a modification of the eighth embodiment. FIG. 33B is a cross-sectional view showing a step of expanding the protruding pipe portion that constitutes the restrained pipe portion in the modified mode of the eighth embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
1 and 2 show a rehabilitated pipe 1A (existing pipe rehabilitation structure) according to a first embodiment of the present invention. The rehabilitated pipe 1A includes an existing pipe 1 and a rehabilitated pipe 3. The existing pipe 1 is rehabilitated by lining the rehabilitation pipe 3 on the inner circumference of the old pipe 1 which has deteriorated. The existing pipe 1 to be rehabilitated is, for example, a sewer pipe buried in the ground, but the present invention is not limited to this, and may be a water pipe, an agricultural water pipe, a gas pipe, a hydroelectric power transmission pipe, or the like. Good.

The rehabilitation pipe 3 is composed of a belt-shaped member 10. The strip-shaped member 10 is spirally wound along the inner circumference of the existing pipe 1 and is manufactured as the spiral tubular rehabilitation pipe 3. The material of the belt-shaped member 10 is a synthetic resin such as polyvinyl chloride (PVC).

As shown in FIG. 3A, the belt-shaped member 10 has a constant cross-sectional shape and extends in the belt length direction orthogonal to the paper surface of the figure. Specifically, the belt-shaped member 10 integrally includes a flat belt-shaped main belt portion 11, a rib 12, a first fitting portion 13, a second fitting portion 14, a stretchable portion 15, and a sub block piece 16. is doing. As shown in FIG. 4, in the spiral tubular rehabilitation pipe 3 including the strip-shaped member 10, the flat front side surface of the main strip 11 is directed toward the inner peripheral side (downward in FIG. 4), and The back side faces the outer peripheral side (upward in FIG. 4). From the back side surface, the ribs 12, the fitting portions 13 and 14, the expansion/contraction portion 15, and the sub block piece 16 are projected to the outer peripheral side. An outer peripheral groove portion 19 is formed between the ribs 12, the fitting portions 13 and 14, the expanding and contracting portion 15 and the sub block piece 16 which are adjacent to each other.

As shown in FIG. 3A, the first fitting portion 13 is provided at one edge portion in the band width direction of the belt-shaped member 10, and the second fitting portion 14 is provided at the other edge portion. A groove 13a is formed in the first fitting portion 13. The groove 13a is opened to the inner peripheral side of the strip-shaped member 10 (downward in FIG. 3A) and extends in the strip length direction (direction orthogonal to the paper surface of FIG. 3A). A sub block piece 16 is formed so as to project obliquely on the outer side portion (the left side portion in FIG. 3A) of the first fitting portion 13 in the band width direction.
The second fitting portion 14 includes a ridge 14a. The ridges 14a project from the main band portion 11 to the outer peripheral side (upper side in FIG. 3A) and extend in the band length direction (direction orthogonal to the paper surface of FIG. 3A).

As shown in FIG. 4, in the rehabilitating pipe 3 manufactured from the strip-shaped member 10, a portion adjacent to each portion (one edge portion) in the strip longitudinal direction of the concave groove 13a in the convex strip 14a by one turn. (The other edge portion) is fitted. As a result, the fitting portions 13 and 14 are joined together. Further, the tip of the sub block piece 16 is locked to the tip of the L-shaped cross section of the adjacent rib 12.

An elastic portion 15 is provided in the belt-shaped member 10 between the fitting portions 13 and 14 in the belt width direction. In the band-shaped member 10 illustrated in FIG. 3, two elastic portions 15 are provided apart from each other in the band width direction, but the number of the elastic portions 15 is not limited to this, and may be one or three or more. Good. The cross-sectional shape of the expandable portion 15 is formed in a bellows shape or a C shape. The elastic portion 15 projects from the main belt portion 11 to the outer peripheral side (upward in the figure) and extends in the belt length direction (direction orthogonal to the paper surface of the figure).
The main belt portion 11 is divided into belt portions 11a and 11b at the location where the expansion/contraction portion 15 is arranged. The band portions 11a and 11b are connected to each other via the stretchable portion 15.
As shown in FIGS. 3B and 3C, the elastic portion 15 can be deformed so as to expand and contract in the band width direction. As a result, the band-shaped member 10 can be deformed so as to expand and contract in the band width direction.

As shown in FIG. 2, the outer diameter of the rehabilitation pipe 3 is smaller than the inner diameter of the existing pipe 1. The bottom of the rehabilitation pipe 3 is seated on the bottom of the inner circumference of the existing pipe 1.
An annular space 9 is formed between the inner peripheral surface of the existing pipe 1 and the rehabilitation pipe 3. The upper portion in the circumferential direction of the inter-tube space 9 is wide and the lower portion in the circumferential direction is narrow. As shown in FIG. 4, the inter-tube space 9 integrally includes an outer peripheral groove portion 19.

As shown in FIGS. 1 and 2, the rehabilitating pipe 3 is provided with a constrained pipe portion 3a and an expandable/contractible pipe portion 3b separately in the pipe axial direction. Both ends of the rehabilitating pipe 3 in the pipe axial direction (portions provided at the end 1e of the existing pipe 1) are the restrained pipe portions 3a. A portion of the rehabilitation pipe 3 excluding the constrained pipe portion 3a is a stretchable pipe portion 3b.

As shown in FIGS. 1 and 2(a), the inter-tube space 9a between the inner peripheral surface of the existing pipe end 1e and the constrained pipe part 3a is filled with the filler 5 (constraining means). There is. The outer peripheral groove portion 19 is also filled with the filler 5.
The filler 5 has fluidity at least at the time of injection/filling, and is preferably composed of a filling-type adhesive having adhesiveness, a sealant, a backfill material, and the like. Examples of the filler 5 include, but are not limited to, silicone, mortar, cement milk, epoxy adhesive, acrylic adhesive, and hot melt adhesive.

The constrained pipe portion 3 a is constrained by the existing pipe 1 via the filler 5. Due to the restraint action, the stretchable deformation of the stretchable portion 15 in the restrained pipe portion 3a is limited. Or, the expansion/contraction part 15 of the restrained pipe part 3a is almost incapable of expansion/contraction deformation.

As shown in FIGS. 1 and 2B, the inter-tube space 9 between the inner peripheral surface of the intermediate portion of the existing pipe 1 and the outer peripheral surface of the expandable tube portion 3b is not filled with the filler 5. Instead, the space 9b includes an air layer (low-viscosity fluid layer). As a result, the expandable/contractible tube portion 3b is in an unrestrained state with respect to the existing tube 1, or is in a weakly restrained state in which it is weaker than the restrained tube portion 3a. Even if the expandable tube part 3b is restrained to some extent by the friction between the bottom part of the expandable tube part 3b and the bottom part of the inner peripheral surface of the existing pipe 1 and the expandable tube part 3b is restrained with respect to the existing pipe 1, It is sufficiently weak as compared with the restrained state of the restrained pipe portion 3a by the filler 5.

The expandable part 15 of the expandable tube part 3b is allowed to expand and contract. In other words, the stretchable portion 15 of the stretchable tube portion 3b is more easily stretched and deformed than the stretchable portion 15 of the restrained pipe portion 3a. When an external force of the same magnitude acts on the expandable tube portion 3b and the constrained tube portion 3a, the amount of expansion and contraction of the expandable portion 15 of the expandable tube portion 3b is equal to that of the expandable portion 15 of the constrained tube portion 3a. Larger than the amount of elastic deformation.

<How to rehabilitate existing pipes>
The aged existing pipe 1 is reconstructed as follows.
Although illustration is omitted, an original push type pipe manufacturing machine (see FIG. 18 and the like) is prepared. The pipe manufacturing machine is installed at the bottom of a human hole 4 connected to one end of the existing pipe 1. The strip-shaped member 10 is sequentially fed out from a winding drum (not shown) on the ground and supplied to the pipe manufacturing machine. In the pipe manufacturing machine, the strip-shaped member 10 is spirally wound, and the rehabilitating pipes 3 are sequentially piped by fitting the adjacent portions of the fitting portions 13 and 14 that are offset from each other by one turn. The pipe-made rehabilitation pipe 3 is sequentially pushed toward the inside of the existing pipe 1. At this time, preferably, the rehabilitation pipe 3 is not pulled from the opposite side of the existing pipe 1. As a result, it is possible to prevent the stretchable portion 15 from being stretched and deformed during rehabilitation work. Therefore, it is possible to secure the expansion and contraction performance of the expandable tube part 3b after the rehabilitated pipe 1A is in service.

After the rehabilitation pipe 3 is installed over the entire length of the existing pipe 1, the filler 5 is filled between the inner peripheral surface of the existing pipe end 1e and the restricted pipe portion 3a.
The filler 5 is not filled between the expandable tube portion 3b and the existing pipe 1.
In this way, the rehabilitated pipe 1A is constructed.

As shown in FIGS. 3B to 3C and FIG. 5, when an external force is applied to the rehabilitated pipe 1A due to a ground movement such as an earthquake, the expansion/contraction part 15 of the expandable/contractible pipe part 3b is expanded/contracted. Since the expandable tube part 3b is not restrained by the existing pipe 1 or has a weak restraining force, the expandable part 15 of the expandable tube part 3b can be surely expanded and contracted without being blocked by the existing pipe 1. .. This makes it possible to absorb the ground fluctuation energy and prevent the fitting portions 13 and 14 from being disconnected from each other. As a result, a fluid such as sewage can be prevented from leaking from between the fitting portions 13 and 14, and the reflow performance of the rehabilitation pipe 3 can be maintained.
Since the constrained pipe portions 3a at both ends of the rehabilitation pipe 3 are constrained by the existing pipe 1, it is possible to prevent the rehabilitation pipe 3 as a whole from being displaced in the pipe axial direction with respect to the existing pipe 1. Furthermore, since the ground fluctuation energy is absorbed by the expandable tube portion 3b, the external force applied to the restrained tube portion 3a and the filler 5 can be relaxed. Therefore, the restrained state of the restrained pipe portion 3a with respect to the existing pipe 1 can be reliably maintained. Further, it is possible to prevent or suppress cracking of the filler 5.

Next, another embodiment of the present invention will be described. In the following embodiments, the same components as those described above are designated by the same reference numerals and the description thereof will be omitted.
<Second Embodiment>
The second embodiment shown in FIGS. 6 and 7 relates to a modification of the filling means for filling the filler 5. As shown in FIG. 6, an injection tube 7 is provided on the outer periphery of the restricted pipe portion 3 a of the rehabilitation pipe 3. As the injection tube 7, a polyethylene tube, a nylon tube, a polyurethane tube, a soft vinyl chloride resin hose reinforced with chemical fibers, or the like can be used.

The infusion tube 7 is spirally wound along the strip member 10. A plurality of injection holes 7c are formed through the wall of the injection tube 7 at intervals in the spiral extending direction. The injection tube 7 is embedded in the filler 5. Specifically, as shown in FIG. 7, the injection tube 7 is housed in, for example, a groove portion 19c between the ribs 12 and 12 of the outer peripheral groove portion 19 of the restricted pipe portion 3a.
The injection tube 7 is provided only in the restricted pipe portion 3a, and is not provided in the expandable pipe portion 3b. The injection tube 7 may be provided also in the expandable tube part 3b, but the injection tube 7 in the expandable tube part 3b may not be provided with the injection hole 7c.

In the second embodiment, in the process of producing the rehabilitating pipe 3, the injection tube 7 is provided in advance in the portion of the strip-shaped member 10 that will be the restrained pipe portion 3a.
As shown by the chain double-dashed line in FIG. 6, after the rehabilitation pipe 3 is installed over the entire length of the existing pipe 1, the supply pipe 7A is connected to the end portion of the injection tube 7. The filler 5 is supplied to the injection pipe 7 from the supply pipe 7A. As shown by the arrow in FIG. 7, the filler 5 is discharged from the injection hole 7c and filled between the restricted pipe portion 3a and the existing pipe 1.

<Third Embodiment>
The third embodiment shown in FIG. 8 relates to a modification of the restraint structure of the restrained pipe portion 3a. A plurality of anchor bolts 6 (restricting means) are arranged in the restricted pipe portion 3a at intervals in the circumferential direction and the pipe axis direction of the restricted pipe portion 3a. Each anchor bolt 6 penetrates through the restricted pipe portion 3 a and the filler 5 and is fixed to the existing pipe 1.
As a result, the restrained pipe portion 3a can be restrained to the existing pipe 1 by the anchor bolt 6 in addition to the filler 5, and can be restrained more strongly than the filler 5 alone.

FIG. 9 shows a further modification of the restraint structure of the constrained pipe portion 3a. Between the inner peripheral surface of the existing pipe 1 and the constrained pipe portion 3a, a spacer S is used instead of the filler. Is provided. Moreover, the constrained pipe portion 3 a is constrained to the existing pipe 1 by the anchor bolt 6.

<Fourth Embodiment>
10 and 11 show a fourth embodiment of the present invention. In the fourth embodiment, the rehabilitation pipe 3 is attached to the inner peripheral surface of the existing pipe 1 over the entire circumference. The outer diameter of the rehabilitation pipe 3 substantially matches the inner diameter of the existing pipe 1. The restricted pipe portion 3a and the expandable pipe portion 3b are both in contact with the inner wall of the existing pipe 1 over the entire circumference.

As shown in FIGS. 10 and 11(a), a filler 5 is filled between the inner peripheral surface of the existing pipe 1 and the restricted pipe portion 3a. Specifically, the filler 5 is filled inside the outer peripheral groove portion 19 of the restricted pipe portion 3a. The filler 5 is adhered to the inner peripheral surface of the existing pipe 1 through the outer peripheral side opening of the outer peripheral groove portion 19. As a result, the restrained pipe portion 3a is restrained to the existing pipe 1 by the adhesive force of the filler 5 in addition to the frictional force between the restrained pipe portion 3a itself and the existing pipe 1.

In the fourth embodiment, the filler 5 is provided in advance on the outer periphery of the portion of the belt-shaped member 10 that is to be the restrained pipe portion 3a. After that, the entire area of the rehabilitation pipe 3 is manufactured so as to be attached to the inner peripheral surface of the existing pipe 1. After the rehabilitating pipe 3 is manufactured to have a smaller diameter than the existing pipe 1, the rehabilitating pipe 3 may be expanded and attached to the inner peripheral surface of the existing pipe 1 by an expansion operation described later.
By sticking, the filler 5 is sandwiched between the inner peripheral surface of the existing pipe 1 and the constrained pipe portion 3a in the constrained pipe portion 3a to be in a filled state.
The filling process of the filler 5 may be performed after the rehabilitation pipe 3 is manufactured. A filling method using the injection tube 7 (FIGS. 6 and 7) may be applied. In addition to the filler 5 or instead of the filler 5, the anchor pipe 6 (FIGS. 8 and 9) may constrain the constrained pipe portion 3a.

As shown in FIGS. 10 and 11(b), the filler 5 is not filled between the inner peripheral surface of the existing pipe 1 and the expandable/contractible pipe portion 3b. The expandable tube part 3b is constrained to the existing tube 1 only by the frictional force between the expandable tube part 3b itself and the existing tube 1. Therefore, the restraining force of the expandable tube portion 3b with respect to the existing pipe 1 is weaker than the restraining force of the restrained pipe portion 3a. The expandable part 25 of the expandable tube part 3b is easier to expand and contract than the expandable part 25 of the constrained tube part 3a.

<Deformation mode of band-shaped member>
The cross-sectional shape of the belt-shaped member suitable for the embodiment of the present invention is not limited to that shown in FIG. FIG. 12 shows a modification of the cross-sectional shape of the belt-shaped member.
In the band-shaped member 10A of FIG. 12A, two (a plurality of rows) concave grooves 13a are formed in the first fitting portion 13 at one edge in the band width direction. A stretchable portion 15 having a C-shaped or U-shaped cross section is provided between the flat main belt portion 11 and the first fitting portion 13.
In the second fitting portion 14 on the other edge of the strip-shaped member 10A in the strip width direction, two (a plurality of rows) of convex strips 14a are formed in parallel. Although illustration is omitted, in the rehabilitation pipe 3 made of the strip-shaped member 10A, the protrusion 14a corresponding to each groove 13a is fitted.

In the belt-shaped member 10B of FIG. 12B, the cross-sectional shapes of the first fitting portion 13 and the second fitting portion 14 are complementary to each other. In the first fitting portion 13, two (plural rows) concave grooves 13a and two (plural rows) convex strips 13b are alternately arranged. The concave groove 13a is opened to the inner peripheral side (downward in FIG. 12B). The ridge 13b is projected from the plate-shaped first fitting base 13x toward the inner peripheral side. The first fitting base portion 13x is arranged in parallel with the main strip portion 11 with being shifted to the outer peripheral side (upward in FIG. 12B) from the main strip portion 11, and is continuous with the main strip portion 11 via the connecting portion 13d. ing.

In the second fitting portion 14 of the belt-shaped member 10B, two (plural rows) convex ridges 14a and two (plural rows) concave grooves 14b are alternately arranged. The ridge 14a is projected to the outer peripheral side (upward in FIG. 12B) from the plate-shaped second fitting base 14x that is flush with the main strip 11. The concave groove 14b is opened to the outer peripheral side.
Although illustration is omitted, in the rehabilitation pipe 3 made of the strip-shaped member 10B, the convex stripes 14a corresponding to the concave grooves 13a are fitted, and the convex stripes 13b are fitted in the corresponding concave grooves 14a.

Further, two bellows-shaped stretchable portions 15 are provided on both sides of the rib 12 at the center of the strip-shaped member 10B in the strip width direction. In the belt-shaped member 10B, the main belt portion 11 is not divided at a continuous portion with each elastic portion 15, and the belt portions 11a and 11b on both sides of the elastic portion 15 are integrally connected. In addition, a notch-like easily breakable portion 15e is formed between the strip portions 11a and 11b of the main strip portion 11.
Both ends of each elastic portion 15 are integrally connected to both sides and to the immediate vicinity of the easily breakable portion 15e with the easily breakable portion 15e of the main strip 11 interposed therebetween.
When an external force due to ground movement such as an earthquake is applied to the rehabilitation pipe 3 made of the strip-shaped member 10B, the easily breakable portion 15e of the expandable pipe portion 3b is broken by the external force (see FIG. 29), and thus the strip portion 11a. , 11b are separated from each other, so that the expandable part 15 can expand and contract in the band width direction.

In the belt-shaped member 10C of FIG. 12(c), a flat bellows-shaped stretchable portion 15 is provided in the central portion in the belt width direction. The structure of the continuous portion of the stretchable portion 15 and the main strip portion 11 in the strip-shaped member 10C is similar to that of the strip-shaped member 10B. Moreover, the structures of the fitting portions 13 and 14 at both ends in the band width direction of the band-shaped member 10C are the same as those of the band-shaped member 10B. No rib is formed on the belt-shaped member 10C.

In the belt-shaped member 10D of FIG. 12(d), a bellows-shaped stretchable portion 15 is provided at the central portion in the belt width direction. The structure of the continuous portion of the stretchable portion 15 and the main strip portion 11 in the strip member 10D is similar to that of the strip member 10B. The structures of the fitting portions 13 and 14 at both ends of the strip-shaped member 10D in the strip width direction are the same as those of the strip-shaped member 10A. The rib 12 is formed between the fitting portions 13 and 14 and the expansion/contraction portion 15.
The band-shaped members 10A to 10D are not provided with the sub block piece 16.

<Fifth Embodiment>
13 to 27 show a fifth embodiment of the present invention.
As shown in FIG. 13, in the rehabilitation pipe 3E according to the fifth embodiment, in addition to the constrained pipe portions 31 and 31 at both ends, the constrained pipe portion 32 is provided in the middle portion. A portion of the rehabilitation pipe 3E between the adjacent constrained pipe portions 31 and 32 is a stretchable pipe portion 33. Moreover, the constrained tube portions 31 and 32 are formed to have a larger diameter than the expandable tube portion 33.

More specifically, as shown in FIG. 13, the portion of the rehabilitation pipe 3E provided at the existing pipe end portion 1e is the restrained pipe portion 31. An attachment pipe 2 (branch pipe) is connected to an intermediate portion of an existing pipe 1 made of a sewer pipe. The portion of the rehabilitation pipe 3E provided at the connection portion with the mounting pipe 2 serves as an intermediate restrained pipe portion 32.

As shown in FIG. 15, the restraint pipe portion 32 is formed with a communication port 32c that communicates with the attachment pipe 2. As shown in FIG. 16, the communication port 32c is an elongated hole with its major axis oriented in the pipe axis direction of the rehabilitation pipe 3E and its minor axis oriented in the circumferential direction of the rehabilitation pipe 3E. The ratio of the major axis to the minor axis of the communication port 32c is preferably about 1.2:1 to 3:1.

As shown in FIG. 13, the outer diameters of the restricted pipe portions 31 and 32 are substantially the same as the inner diameter of the existing pipe 1. These restricted pipe portions 31, 32 are pressed against the inner peripheral surface of the existing pipe 1 over the entire circumference. Specifically, as shown in FIGS. 14A and 15, the tops of the ribs 12 in the restrained pipe portions 31 and 32 are abutted against the inner peripheral surface of the existing pipe 1.

As shown in FIGS. 14A and 15, the outer peripheral side opening of the outer peripheral groove portion 19 in the constrained pipe portions 31 and 32 is closed by the inner peripheral surface of the existing pipe 1. The inside of the outer peripheral groove portion 19 (inter-tube space 9b) is filled with the filler 5. The filler 5 is adhered to the inner peripheral surface of the existing pipe 1 through the outer peripheral side opening of the outer peripheral groove portion 19. As a result, the inter-tube space 9b between the inner peripheral surface of the existing pipe 1 and the restricted pipe portions 31, 32 is filled with the filler 5.

As shown in FIGS. 13 and 14(b), the expandable tube portion 33 has a smaller diameter than the restrained tube portions 31 and 32, and thus the existing pipe 1, and the entire outer peripheral surface of the expandable tube portion 33 is the existing pipe. It is far from the inner peripheral surface of 1. The space between the inner peripheral surface of the existing pipe 1 and the expandable/contractible pipe portion 33 is not filled with the filler 5 and forms an annular space 9b. Therefore, the expandable tube part 33 is not directly restrained by the existing pipe 1. There is no direct frictional force acting between the expandable pipe part 33 and the existing pipe 1.
As shown in FIG. 13, a portion of the rehabilitation pipe 3E between the constrained pipe portions 31 and 32 and the expandable/contractible pipe portion 33 has a taper 34 whose diameter decreases toward the expandable/contractible pipe portion 33.

As shown in FIG. 13, the restricted pipe portions 31 and 32 and the expandable/contractible pipe portion 33 have different helical states (lead angle, pitch, etc.) from each other. The lead angles θ ₃₁ and θ ₃₂ of the spiral in the constrained tube portions ₃₁ and ₃₂ are smaller than the lead angles θ ₃₃ of the spiral in the expandable tube portion 33 (θ ₃₁ <θ ₃₃ , θ ₃₂ <θ ₃₃ ). The spiral pitches P ₃₁ and P ₃₂ in the constrained tube portions ₃₁ and ₃₂ are smaller than the spiral pitch P ₃₃ in the expandable tube portion 33 (P ₃₁ <P ₃₃ , P ₃₂ <P ₃₃ ).

As shown in FIG. 14, the strip-shaped member 10E of the fifth embodiment has a cross-sectional shape that is substantially equivalent to that of the strip-shaped member 10D shown in FIG. 12(d). Of course, band-shaped members 10A to 10C having other cross-sectional shapes may be used.
As shown in FIG. 17, two (a plurality of rows) of concave grooves 13c and 13d are formed in the first fitting portion 13 (one edge portion) of the belt-shaped member 10E. The second fitting portion 14 (the other edge portion) of the belt-shaped member 10E is provided with two (a plurality of rows) of ridges 14c and 14d.
In the strip-shaped member 10E manufactured into the rehabilitation pipe 3E, the ridges 14c and the recessed grooves 13c and the ridges 14d and the recessed grooves 13d, which correspond to each other, are fitted (joined) together.

Further, as shown in FIGS. 14 and 17, in the rehabilitated pipe 3E after pipe manufacturing, in each of the constrained pipe portions 31 and 32 and the expandable/contractible pipe portion 33, the two (plural rows) ridges are provided. Of the 14c and 14d, the ridge 14c on the outer side (a part) in the band width direction is cut at the root portion and separated from the main band 11. The remaining ridges 14d are continuous with the main strip 11.

As shown in FIG. 17, an adhesive 51 is provided between the inner peripheral surface of the concave groove 13c and the ridge 14c. The ridges 14c are firmly bonded to the concave grooves 13c and then to the first fitting portion 13 via the adhesive 51. As the adhesive 51, for example, a hot melt adhesive is used.
A sealant 52 is provided between the groove 13d and the ridge 14d. The ridge 14d is joined to the concave groove 13d and the first fitting portion 13 via the sealant 52. The sealant 52 allows the ridge 14d to slide along the groove 13d. As the sealant 52, a moisture-curable adhesive such as a silicone sealant is used.

In the fifth embodiment, the rehabilitation pipe 3E is manufactured and the existing pipe 1 is rehabilitated as follows.
<Pipe making process>
As shown in FIG. 18 and FIG. 21, an original push pipe making machine 20 is prepared, and the pipe making machine 20 is installed at the bottom of the starting side human hole 4. The strip-shaped member 10E is sequentially fed out from a winding drum (not shown) on the ground and supplied to the pipe manufacturing machine 20. In the pipe manufacturing machine 20, the strip-shaped member 10E is spirally wound, and the refitting pipes 3E are sequentially piped by fitting the adjacent portions of the fitting portions 13 and 14 that are offset from each other by one round. The outer diameter (pipe-making diameter) of the rehabilitating pipe 3E during pipe making is smaller than the inner diameter of the existing pipe 1. Preferably, the pipe manufacturing diameter is adjusted to the desired outer diameter of the expandable tube portion 33.

For example, as shown in FIG. 28, a hot-melt adhesive 51 is provided in advance in the groove 13c of the fitting portion 13 and a sealant 52 is provided in the groove 13d before the pipe manufacturing process. Then, as shown in FIG. 22(a), the adhesive 51 is heated and melted before and after the corresponding protrusions 14c and 14d and the recessed grooves 13c and 13d are fitted to each other. 14c and the concave groove 13c, and eventually the fitting portions 13 and 14 are bonded together.

As shown in FIG. 18, the pipe-made rehabilitation pipe 3E is sequentially pushed toward the inside of the existing pipe 1 by the original press pipe making machine 20. At this time, preferably, the rehabilitation pipe 3E is not pulled from the opposite side (the right side in FIG. 18) of the existing pipe 1. Thereby, the expansion/contraction performance of the expandable tube part 3b can be ensured.
Since the fitting portions 13 and 14 are adhered to each other with the adhesive 51, the fitting state at the time of the original press pipe manufacturing can be reliably maintained, and stable pipe manufacturing can be performed.

As shown in FIG. 18, the wire 41 (projection cutting means) is fed from the wire feeding reel 42 and introduced into the pipe manufacturing machine 20 in parallel with the feeding of the belt-shaped member 10E. As shown in FIG. 22A, in the pipe manufacturing machine 20, the wire 41 is sandwiched between the fitting portions 13 and 14 (adjacent edge portions). Specifically, the wire 41 is sandwiched between the first fitting portion 13 and the portion of the second fitting portion 14 between the ridges 14 c and 14 d. Preferably, a holding groove 13f having a semicircular cross section is formed in the first fitting portion 13, and the wire 41 is fitted and held in the holding groove 13f. The wire 41 is arranged on the side of the root portion of the ridge 14c.
As shown in FIG. 19, the wire 41 is spirally wound along the strip-shaped member 10E over the entire area of the rehabilitation pipe 3E. The wire 41 is pulled out from the arrival side end 39 on the opposite side (right side in FIG. 19) to the original pushing side (left side in FIG. 19) of the rehabilitation tube 3E and folded back, and passed through the internal space of the rehabilitation tube 3E, It is wound around the wire take-up reel 43 on the side of the pipe making machine 20.

As shown in FIG. 19, the reaching side end portion 39 of the rehabilitation pipe 3E reaches the reaching side human hole 4B, thereby completing the pipe manufacturing process. The rehabilitation pipe 3E at this time has a uniform diameter smaller than that of the existing pipe 1 over the entire area. The constrained tube portions 31 and 32 have the same diameter as the expandable tube portion 33.
Hereinafter, when distinguishing the constrained pipe portions 31 at both ends of the rehabilitation pipe 3E from each other, the one on the original push side (one end side, the left side in FIG. 19) is referred to as “constrained pipe portion 31A”, and the arrival side (one end side). The other side (the right side in FIG. 19) is referred to as a “constrained tube portion 31B”.

<Restriction process>
Then, the constrained pipe portions 31 and 32 are constrained to the existing pipe 1 as follows.
First, the reaching side end portion 39 of the rehabilitation pipe 3E is fixed (rotated) to the existing pipe 1 by the fixing jig 8. As the fixing jig 8, a rod member that penetrates the rehabilitation pipe 3 in the diameter direction can be used.
The reaching side end portion 39 of the rehabilitation pipe 3E does not necessarily have to be fixed to the existing pipe 1. The fixing jig 8 may be omitted.

Subsequently, as shown in FIG. 20, the wire winding reel 43 pulls the wire 41 in the tube axis direction while winding the wire 41. As a result, the folded-back portion 41c of the wire 41 is spirally moved from the reaching-side end portion 39 toward the original pushing side. At this time, as shown in FIG. 22( b ), a root portion of a part of the ridges 14 c of the ridges 14 c, 14 d in the unexpanded constrained tube portion 31 B is cut by the folded portion 41 c of the wire 41. To be done. Therefore, the joining force between the fitting portions 13 and 14 in the constrained pipe portion 31B is weakened as compared with the pipe manufacturing time. The ridge 14c after cutting is left in a state of being fitted in the groove 13c.
The folded-back portion 41c of the wire 41 after winding is located between the constrained pipe portion 31B and the pipe portion 35 on the original push side (one end side in the pipe axial direction) of the constrained pipe portion 31B. As a result, the ridge 14c from the reaching end 39 of the rehabilitation pipe 3E to the end of the constrained pipe 31B on the original pushing side (one end) is cut, and the joining force between the fitting portions 13 and 14 is weakened. Be done.

As shown in FIG. 21, a guide rail 25 is installed at the bottom of the starting side human hole 4. The extension direction of the guide rail 25 is directed to the pipe axis direction of the rehabilitation pipe 3E and the existing pipe 1 (direction orthogonal to the paper surface of FIG. 21). A slide guide 26 is provided at the bottom of the original press pipe making machine 20, and the slide guide 26 is slidably fitted to the guide rail 25. As a result, the original press pipe making machine 20 is made slidable in the extending direction of the guide rail 25, that is, the pipe axis direction.

Then, as shown in FIG. 23, the former-push pipe making machine 20 is re-driven to cause the former-push pipe making machine 20 to move the pipe portion 35 on the former push side of the constrained pipe portion 31B to one of the strip-shaped members 10E. Twisting is performed in a direction in which the length (circumferential length) of the wound portion is expanded (the broken line arrow direction a in FIG. 23) (twisting step). That is, the twisting force F is applied to the pipe portion 35 by pushing the pipe portion 35 toward the restrained pipe portion 31B while rotating the pipe portion 35. Preferably, as shown by an arrow line a ₁₈ in FIG. 23, the unpressed pipe part 18 of the strip-shaped member 10E is connected to the original push side of the pipe part 35 following the band part 18 by the original press pipe making machine 20. It is fed toward the end and incorporated into the tube portion 35. The twisting force F can be generated by the feeding force of the band portion 18.

In the pipe portion 35, the ridges 14c are not cut, and the joining force between the fitting portions 13 and 14 is kept high during pipe production. The whole is rotated as a unit. For this reason, the length (peripheral length) of one round of the belt-shaped member 10E in the pipe portion 35 is not expanded, and the pipe portion 35 is not expanded in diameter. The twisting force F is transmitted to the restricted pipe portion 31B via the pipe portion 35.

In the constrained pipe portion 31B, the joining force between the fitting portions 13 and 14 is weakened, so that the twisting force F _31B transmitted from the pipe portion 35 is applied in the winding direction of the strip-shaped member 10E, so that the fitting The joint portions 13 and 14 slide so as to be displaced from each other along the winding direction. Since the sealant 52 that allows sliding is interposed between the ridge 14d and the concave groove 13d, the fitting portions 13 and 14 can be smoothly slid. As a result, the length of one roll of the belt-shaped member 10E in the constrained tube portion 31B is expanded (expansion step). As a result, the diameter of the constrained pipe portion 31B is expanded from that during pipe manufacturing (diameter expansion step). The expansion phenomenon, and thus the diameter expansion phenomenon, successively propagates from the end portion on the pipe portion 35 side of the restrained pipe portion 31B toward the arrival side end portion 39. A tapered portion 34 is formed between the constrained pipe portion 31B and the pipe portion 35.

The helical shape of the constrained tube portion 31B changes so that the lead angle θ ₃₁ becomes smaller and the pitch P ₃₁ becomes smaller as the diameter increases. Therefore, the axial length of the constrained pipe portion 31B is reduced, and the end portion of the constrained pipe portion 31B on the pipe portion 35 side is displaced to the arrival side end portion 39 side (right side in FIG. 23). Along with this, the pipe portion 35 is entirely displaced to the arrival side end portion 39 side. Further, as shown by the arrow a ₂₀ in FIG. 23, the original press pipe making machine 20 is slid along the guide rail 25 to the arrival side end 39 side, that is, the pushing side, by being pulled by the pipe portion 35. ..
Conversely speaking, the slide of the former-press pipe making machine 20 allows the displacement of the pipe portion 35 toward the arrival side end portion 39 side, and allows the change in the helical shape of the restrained pipe portion 31B. Therefore, the diameter of the constrained pipe portion 31B can be smoothly expanded, and when the diameter is expanded, the original pressing pipe making machine 20 becomes a resistance and the fitting portions 13 and 14 are disengaged, and the expansion and contraction portion 15 is expanded and contracted. Can be prevented.
The diameter of the constrained pipe portion 31B whose diameter has been expanded is pressed against the inner peripheral surface of the existing pipe 1 to be constrained by the existing pipe 1 (constraining step).
When the entire constrained pipe portion 31B is pressed against the inner peripheral surface of the existing pipe 1 and constrained, the pipe manufacturing machine 20 is stopped.
Instead of cutting the ridges 14c in the entire region of the constrained pipe portion 31B at one time to expand (expand) the constrained pipe portion 31B in one step, the ridge 14c is divided into a plurality of times from the reaching side end portion 39. The ridge 14c may be cut in stages, and the newly cut portion may be expanded (expanded) every time the cutting progresses.

Next, as shown in FIG. 24, the wire winding reel 43 again pulls the wire 41 in the tube axial direction while winding the wire 41, so that the folded-back portion 41c is the original push side (one end side) of the unexpanded restricted pipe portion 32. ) End (left end in FIG. 24). As a result, the root portion of the ridge 14c from the end of the tube portion 35 on the side of the constrained tube portion 31B to the end of the constrained tube portion 32 on the original push side is newly cut by the folded portion 41c of the wire 41. (See FIG. 22B). Therefore, the joining force between the fitting portions 13 and 14 of the newly cut portion is weakened as compared with the pipe manufacturing. As a whole of the rehabilitating pipe 3E, the ridge 14c from the reaching side end 39 to the original pushing side end of the restrained pipe 32 is cut.
The original press pipe making machine 20 is returned along the guide rail 25 to the initial position on the opposite side (left side in FIG. 24) from the pushing side.

Next, as shown in FIG. 25, the original-push pipe making machine 20 is driven again, and similarly to when the constrained pipe part 31B is expanded, the pipe part 36 on the original push side of the constrained pipe part 32 is not manufactured. The band portion 18 of the pipe is fed, and the pipe portion 36 is twisted in the expansion direction a by the feeding force (twisting step). As a result, a twisting force F ₃₂ is applied to the restrained pipe portion 32 via the pipe portion 36, and the fitting portions 13 and 14 of the restrained pipe portion 32 slide so as to shift from each other along the winding direction, The length of one roll of the belt-shaped member 10E is expanded (expansion step). As a result, the diameter of the constrained pipe portion 32 is expanded from that during pipe manufacturing (diameter expansion step). The restricted pipe portion 32 whose diameter has been expanded is pressed against the inner peripheral surface of the existing pipe 1 to be restricted (restriction step). The helical shape of the constrained tube portion 32 changes so that the lead angle θ ₃₂ and the pitch P ₃₂ decrease as the diameter increases, and the axial length of the constrained tube portion 32 contracts. At this time, the former-press pipe making machine 20 is slid to the pushing side (right side in FIG. 25), whereby the diameter of the restricted pipe portion 32 can be smoothly expanded.

The expansion phenomenon and thus the diameter expansion phenomenon successively propagate from the end of the restricted pipe portion 32 on the pipe portion 36 side toward the arrival side (the right side in FIG. 25). When the diameter of the constrained pipe portion 32 having the expanded diameter reaches a desired axial length, the original press pipe making machine 20 is stopped.
Tapered portions 34 are formed on both sides of the restricted pipe portion 32 in the pipe axis direction.
An unexpanded diameter portion between the constrained pipe portions 31B and 32 becomes a stretchable pipe portion 33.
In the pipe portion 36, since the joining force between the fitting portions 13 and 14 is kept high as it is during pipe manufacturing, expansion and diameter expansion due to the twisting operation do not occur.
The ridge 14c of the restricted pipe portion 32 may be stepwise cut from the reaching side (right side in FIG. 25) in a plurality of times, and the cut portion may be expanded (expanded) at each step. ..

Next, as shown in FIG. 26, the wire take-up reel 43 is again used to pull the wire 41 in the pipe axial direction while winding the wire 41 so that the folded-back portion 41c is the end of the rehabilitation pipe 3E on the original push side or the original push pipe making machine. Move to 20. As a result, the root portion of the ridge 14c in the pipe portion 36 is newly cut by the folded portion 41c of the wire 41 (see FIG. 22(b)). Therefore, the joining force between the fitting portions 13 and 14 of the pipe portion 36 is weakened as compared with the pipe manufacturing. The ridge 14c of the entire rehabilitation pipe 3E is cut.
The original press pipe making machine 20 is returned to the initial position on the opposite side (left side in FIG. 26) from the pushing side along the guide rail 25.

Next, as shown in FIG. 27, the original press pipe making machine 20 is driven again, and the unmade pipe zone portion 18 is made to bind the restrained pipe of the pipe portion 36 in the same manner as when the restrained pipe portions 31B and 32 are expanded. It is sent to the part 31A. As a result, the twisting force F _31A in the expansion direction a directly acts on the original push-side end portion (the end portion that is continuous with the unmade pipe portion 18) of the restrained pipe portion 31A (twisting step). Due to the twisting force F _31A , the fitting portions 13 and 14 of the restrained tube portion 31A slide so as to be displaced from each other along the winding direction, and the length of one winding of the belt-shaped member 10E is expanded (expansion). Process). As a result, the diameter of the constrained pipe portion 31A is expanded from that during pipe manufacturing (diameter expansion step). The helical shape of the constrained tube portion 31A changes so that the lead angle θ ₃₁ and the pitch P ₃₁ decrease as the diameter increases, and the axial length of the constrained tube portion 31A contracts. At this time, the former-press pipe making machine 20 is slid to the pushing side (right side in FIG. 27), whereby the diameter of the constrained pipe portion 31A can be smoothly expanded.

The expansion phenomenon of the constrained tube portion 31A, and thus the diameter expansion phenomenon, successively propagates from the end portion of the original side of the rehabilitation tube 3E to the arrival side (right side in FIG. 27). When the diameter of the constrained pipe portion 31A whose diameter has been expanded reaches a desired axial length, the original press pipe making machine 20 is stopped.
The unexpanded pipe portion 36 between the constrained pipe portion 31A and the constrained pipe portion 32 becomes the expandable/contractible pipe portion 33. A taper portion 34 is formed between the expandable tube portion 33 and the restrained tube portion 31A.
In addition, the ridge 14c of the constrained tube portion 31A may be cut stepwise from the reaching side (right side in FIG. 27) in a plurality of times, and the cut portion may be expanded (expanded) at each step. ..

As shown in FIG. 14A, the filler 5 is filled between the outer peripheral groove portion 19 of the restrained pipe portions 31 and 32 and the inner peripheral surface of the existing pipe 1. As shown in FIG. 14( b ), the space between the expandable pipe portion 33 and the existing pipe 1 is not filled with the filler 5 to form a space 9 b.
The step of installing the filler 5 may be performed before the pipe forming of the rehabilitation pipe 3E. For example, as shown in FIG. 28, the filler 5 is applied to the outer peripheral portion of the belt-shaped member 10E before pipe making, including the outer peripheral groove portion 19 of the portions to be the restrained pipe portions 31 and 32. As shown in FIG. 14( a ), when the diameter of the constrained pipe portions 31 and 32 after pipe production is expanded and pressed against the inner peripheral surface of the existing pipe 1, the filler on the outer periphery of the constrained pipe portions 31 and 32. 5 is sandwiched between the inner peripheral surface of the existing pipe 1 and the constrained pipe portions 31 and 32 and filled. The filler 5 is intimately adhered to the inner peripheral surface of the existing pipe 1.
After filling the rehabilitating pipe 3E or after expanding (expanding) the constrained pipe portions 31 and 32, the filling process of the filler 5 may be performed. You may apply the filling method by the injection tube 7 of 2nd Embodiment (FIG. 6, FIG. 7).

Further, as shown in FIGS. 15 and 16, a long hole-shaped communication port 32c is drilled in the restricted pipe portion 32.
In this way, the rehabilitated pipe 1E is constructed.

According to the rehabilitated pipe 1E of the fifth embodiment, not only the constrained pipe portions 31 and 32 are constrained by the existing pipe 1 by the adhesive force of the filler 5, but also the inner peripheral surface of the existing pipe 1 is expanded by the diameter expansion. Being restrained by being pressed all around.
As shown in FIG. 29, when a ground movement such as an earthquake occurs, the easily breakable portion 15e of the stretchable portion 15 in the stretchable pipe portion 33 is broken, and the stretchable portion 15 moves in the band width direction, that is, the pipe axis direction ( The ground fluctuation energy can be absorbed by expanding and contracting in the left-right direction in the figure. In particular, in the fifth embodiment, since the expandable tube portion 33 is not in contact with the inner peripheral surface of the existing pipe 1 not only in the upper side portion in the circumferential direction but also in the bottom side portion, No direct frictional force from 1. Therefore, the expansion/contraction performance of the expansion/contraction part 15 in the expandable/contractible tube part 33 can be sufficiently exhibited.
Even if the constrained pipe portion 32 is displaced with respect to the mounting pipe 2 due to ground fluctuation, the communication port 32c is a long hole, so that the communication state between the internal space of the rehabilitation pipe 3E and the mounting pipe 2 can be maintained. ..
Furthermore, the sealing agent 52 can ensure the watertightness between the fitting portions 13 and 14.

<Sixth Embodiment>
FIG. 30 shows a sixth embodiment of the present invention. In this embodiment, the operator A manually expands (expands) the constrained tube portion 31.
After the rehabilitation pipe 3E is manufactured to have a diameter smaller than the inner diameter of the existing pipe 1, the twist jig B is attached to the end of the rehabilitation pipe 3E. The twisting jig B is composed of, for example, a rod-shaped lever, and penetrates the end portion of the rehabilitation pipe 3E in the diameter direction. Preferably, the ridge 14c of the constrained tube portion 31 to be expanded in diameter is cut in advance (see FIG. 22). More preferably, during the pipe manufacturing process of the rehabilitating pipe 3E, a slip-permitting sealant 52 is applied between the ridges 14d and the concave grooves 13d (see FIG. 22).
Further, the filler 5 is applied to the outer peripheral portion of the restricted pipe portion 31 including the outer peripheral groove portion 19 in advance.

Then, the twisting jig B twists the rehabilitation pipe 3E in a direction in which the length of one roll of the strip-shaped member 10E forming the constrained pipe portion 31 is expanded. Thereby, the constrained pipe portion 31 can be expanded in diameter and pressed against the inner peripheral surface of the existing pipe 1 to be constrained. Further, the pre-applied filler 5 is sandwiched and filled between the inner peripheral surface of the existing pipe 1 and the constrained pipe portion 31. As a result, the restricted pipe portion 31 can be surely restricted.

<Seventh Embodiment>
The seventh embodiment shown in FIG. 31 relates to a modification of the expansion (diameter expansion) method of the restricted pipe portion 31.
After the rehabilitation pipe 3E is manufactured to have a diameter smaller than the inner diameter of the existing pipe 1, the expander 60 (pushing and expanding means) is installed inside the unexpanded restricted pipe portion 31. The expander 60 is formed of, for example, a tubular air packer. A lubricant 62 is applied to the inner peripheral surface of the constrained tube portion 31 or the outer peripheral surface of the expandable body 60. Preferably, similarly to the sixth embodiment, the ridge 14c of the restrained tube portion 31 is cut in advance, and the slippery sealant 52 is applied between the ridge 14d and the groove 13d (Fig. 22). Further, the filler 5 is applied to the outer peripheral portion of the restricted pipe portion 31.

Then, as shown in FIG. 31, fluid pressure such as air pressure is supplied from the fluid pressure supply tube 61 to the inside of the expander 60 to expand the expander 60.
The expanded body 60 that has expanded is pressed against the inner peripheral surface of the constrained tube portion 31, and further pushes the entire region of the constrained tube portion 31 radially outward. As a result, the fitting portions 13 and 14 of the constrained tube portion 31 slide so as to be displaced from each other along the winding direction. As a result, the length of one roll of the belt-shaped member 10E in the constrained tube portion 31 is expanded, and the constrained tube portion 31 is expanded in diameter. At this time, the lubricant 62 can reduce the friction between the expansion body 60 and the constrained pipe portion 31, and can smoothly expand the constrained pipe portion 31.

The diameter of the constrained pipe portion 31 whose diameter is increased is pressed against the inner peripheral surface of the existing pipe 1. In addition, the filler 5 applied to the outer peripheral portion of the constrained pipe portion 31 is sandwiched between the inner peripheral surface of the existing pipe 1 and the constrained pipe portion 31 and filled. As a result, the restricted pipe portion 31 is restricted with respect to the existing pipe 1.

The pushing and spreading means that pushes the restrained pipe portion 31 outward in the radial direction is not limited to the inflatable body 60 such as an air packer, but may be, for example, a radial jack device.
Not only the restricted pipe portion 31 at the end of the rehabilitation pipe 3E, but also the restricted pipe portion 32 at the middle portion can be expanded (diameter expanded) in the same manner.

<Eighth Embodiment>
FIG. 32 shows an eighth embodiment of the present invention.
As shown in FIG. 32B, in the rehabilitation pipe 3H of the eighth embodiment, a projecting pipe portion 38 serving as a restrained pipe portion is formed at the end of the expandable pipe portion 33 having a smaller diameter than the existing pipe 1. There is. The protruding pipe portion 38 is expanded in diameter in a tapered shape from the expandable/contractible pipe portion 33 toward the outside in the pipe axis direction, and protrudes into the human hole 4 from the existing pipe end portion 1e. The diameter-enlarged end of the protruding pipe portion 38 has a larger diameter than the existing pipe end 1e. The outer peripheral portion of the projecting pipe portion 38 abuts on the peripheral edge of the opening end of the existing pipe end portion 1e and is locked.

An annular corner portion 1g is formed between the outer peripheral portion of the protruding pipe portion 38 protruding into the human hole 4 and the end surface of the existing pipe 1 and the inner wall of the human hole 4. The corner portion 1g is filled with a filler 53. As the filler 53, an adhesive, a sealant, a mortar or the like is used.
The protruding pipe portion 38 is constrained to the existing pipe end portion 1e by the engagement with the opening end of the existing pipe end portion 1e and the filler 53.

In the eighth embodiment, rehabilitation work is performed as follows.
As shown in FIG. 32( a ), the rehabilitation pipe 3H is manufactured to have a diameter smaller than the inner diameter of the existing pipe 1. The end of the rehabilitation pipe 3H is projected into the human hole 4 from the existing pipe end 1e.
Subsequently, as shown by the chain double-dashed line in FIG. 32(a), the length of one winding of the strip-shaped member 10E that constitutes the end of the rehabilitation pipe 3H is expanded to form the tapered protruding pipe portion 38. Form. The expansion method may be performed by using the original press pipe making machine 20 (see FIG. 27 or the like) or manually by using the twisting jig B (see FIG. 30). 31) and the like.
When the bottom portion of the projecting pipe portion 38 interferes with the bottom portion (invert) of the human hole 4, the notched concave portion 4e is formed in advance by cutting off the interfering portion.
As shown in FIG. 32( b ), after forming the protruding tube portion 38, the corner portion 1 g is filled with the filler 53.

FIG. 33 shows a modification of the eighth embodiment.
As shown in FIG. 33( a ), in this modification, the rehabilitating pipe 3H is manufactured so as to be attached to the inner peripheral surface of the existing pipe 1. Therefore, the outer diameter of the expandable tube part 33 becomes substantially the same as the inner diameter of the existing tube 1, and the outer peripheral part of the expandable tube part 33 contacts the inner peripheral surface of the existing tube 1 over the entire circumference. After the rehabilitation pipe 3H is manufactured to have a diameter smaller than the inner diameter of the existing pipe 1, the rehabilitation pipe 3H may be expanded in diameter by the expanding operation and attached to the inner peripheral surface of the existing pipe 1.

After the rehabilitation pipe 3H is manufactured, as shown by the chain double-dashed line in FIG. 33(a), the length of one roll of the strip-shaped member 10E that constitutes the part of the rehabilitation pipe 3H that protrudes from the existing pipe end 1e. And the tapered protruding tube portion 38 is formed.
As shown in FIG. 33( b ), the corner portion 1 g between the outer peripheral portion of the protruding pipe portion 38 and the end surface of the existing pipe 1 and the inner wall of the human hole 4 is filled with the filler 53.
In the modification, almost the entire protruding pipe portion 38 serving as the restrained pipe portion is projected to the outside of the existing pipe 1. A continuous portion of the tapered projecting pipe portion 38 and the straight tubular expandable pipe portion 33 is locked to the open end of the existing pipe end portion 1e.

The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention.
For example, the rehabilitation pipe may be composed of a plurality of strip-shaped members (for example, a strip body (strip) and a connection strip (joiner)), and some of the strip-shaped members may be provided with a stretchable portion.
Of the constrained tube section 3a and the expandable tube section 3b, only the strip-shaped member forming the expandable tube section 3b may have the expandable section 15. The band-shaped member in the constrained tube portion 3a may not have the expansion/contraction portion 15.
In the pipe making step, a rehabilitated pipe may be made using a self-propelled pipe making machine.
It is also possible to install the former-press pipe making machine 20 in the human hole 4B on the arrival side in the pipe making process and perform the expanding process including the twisting process.

INDUSTRIAL APPLICABILITY The present invention can be applied to, for example, a technique for rehabilitating an aged sewer pipe.

1A, 1E Rehabilitated pipe (existing pipe rehabilitation structure)
1 Existing pipe 1e Existing pipe end 2 Attachment pipe (branch pipe)
3,3E,3H Rehabilitation pipe 3a Restrained pipe part 3b Expandable tube part 5 Filler (restraining means)
6 Anchor bolt (restraint)
7 injection tube 7c injection hole 8 fixing jig 9 inter-tube space 9b void 10 band-shaped members 10A to 10D band-shaped member 10E band-shaped member 13 first fitting portions 13a, 13d concave groove 13b convex line 13c concave line corresponding to some convex line Groove 14 Second fitting portion 14a, 14d Convex ridge 14b Concave groove 14c Part of ridge 15 Expansion/contraction portion 19 Outer peripheral groove (inter-tube space)
19c Groove part 18 Band part of unmade pipe 20 Original pushing pipe making machine 25 Guide rail 26 Slide guide 31, 32 Restrained pipe part 32c Communication port 33 Stretchable pipe part 35, 36 Pipe on the original push side from the restrained pipe part Portion 36 Tube portion on the original push side from the constrained pipe portion 38 Projecting pipe portion (constrained pipe portion)
39 Reach-side end 41 Wire 41 (projection cutting means)
41c Fold-back part 42 Wire feeding reel 43 Wire take-up reel 51 Adhesive 52 Sealant 53 Filler 60 Expander (expansion means)
61 Fluid pressure supply tube

Claims (33)

A strip-shaped member provided with a spiral tubular rehabilitation pipe along the inner circumference of an existing pipe, wherein the rehabilitation pipe is spirally wound, and the two edge portions in the band width direction are offset by one turn from each other and adjacent edge portions are joined together. It is an existing pipe rehabilitation structure composed by
The rehabilitating pipe is provided with a restrained pipe portion restrained with respect to the existing pipe and a stretchable pipe portion in a non-restrained state or weakly restrained state with respect to the existing pipe, which are separated in the pipe axial direction. ,
An existing pipe characterized in that, in the band-shaped member, at least a portion of the constrained pipe part and the expandable tube part that constitutes the expandable tube part has an expandable part that can expand and contract in the band width direction. Rehabilitation structure. The existing pipe rehabilitation structure according to claim 1, wherein the restricted pipe portion has a larger diameter than the expandable pipe portion. The existing pipe rehabilitation structure according to claim 2, wherein a lead angle of the spiral in the restricted pipe portion is smaller than a lead angle of the spiral in the expandable tube portion. A plurality of rows of concave grooves are formed on at least one edge of both edges of the strip-shaped member, and a plurality of rows of ridges are formed on at least the other edge of both edges. The ridges and grooves corresponding to each other in the adjacent edge portions are fitted together,
The existing pipe rehabilitation structure according to claim 2 or 3, wherein a part of the plurality of rows of ridges is cut at a root portion. It is characterized in that the part of the ridges is joined to the corresponding groove via an adhesive, and the ridges other than the part are joined to the corresponding groove via a slip-permitting sealant. The existing pipe rehabilitation structure according to claim 4. The existing pipe rehabilitation structure according to any one of claims 1 to 5, wherein a portion of the rehabilitation pipe provided at an end portion of the existing pipe is the restricted pipe portion. The existing pipe rehabilitation structure according to claim 6, wherein the restricted pipe portion is projected from an end portion of the existing pipe and has a diameter larger than an inner diameter of the existing pipe. The existing pipe according to any one of claims 1 to 7, wherein a portion of the rehabilitating pipe provided at a connection portion of the existing pipe with the branch pipe is the restrained pipe portion. Rehabilitation structure. A communication port that is continuous with the branch pipe is formed in the restricted pipe portion of the connection portion, and the communication port is a long hole having a long axis oriented in the pipe axis direction. The existing pipe rehabilitation structure described in 8. The existing pipe rehabilitation structure according to any one of claims 1 to 9, further comprising a restraint unit that restrains the restrained pipe portion to the existing pipe. The restraint means includes a filler filled between the inner peripheral surface of the existing pipe and the constrained pipe portion, and there is a gap between the inner peripheral surface of the existing pipe and the expandable pipe portion. The existing pipe rehabilitation structure according to claim 10, which is formed. An outer peripheral groove portion is formed on the outer periphery of the rehabilitation pipe, and the filler is filled only in the outer peripheral groove portion of the constrained pipe portion of the constrained pipe portion and the stretchable pipe. Existing pipe rehabilitation structure described in. The existing tube according to claim 11 or 12, wherein an injection tube having an injection hole for the filler is provided on the outer periphery of the restricted tube portion, and the injection tube is embedded in the filler. Rehabilitation structure. The existing pipe rehabilitation structure according to any one of claims 10 to 13, wherein the restraint means includes an anchor bolt. Both the constrained pipe part and the expandable/contractible pipe part are in contact with the inner wall of the existing pipe over the entire circumference thereof, and the restraint means applies only to the constrained pipe part of the constrained pipe part and the stretchable pipe. The existing pipe rehabilitation structure according to any one of claims 11 to 14, wherein the existing pipe rehabilitation structure is provided. A method of rehabilitating an existing pipe with a spiral tubular rehabilitation pipe,
The belt-shaped member is spirally wound along the inner circumference of the existing pipe, and the rehabilitating pipe is manufactured by joining the edge portions of the belt-shaped member, which are adjacent to each other in the band-width direction, with one turn offset from each other. The process of pipe
A retractable pipe portion of the rehabilitating pipe is restrained with respect to the existing pipe, and an extendable pipe portion set separately from the restrained pipe portion of the rehabilitating pipe in the pipe axial direction is provided with respect to the existing pipe. A step of setting the unrestrained state or the weakly restrained state,
In the pipe making step, at least the expandable pipe part of the constrained pipe part and the expandable pipe part is made by a band-shaped member having an expandable part that can expand and contract in the band width direction. Tube rehabilitation method. 17. The existing pipe rehabilitation method according to claim 16, wherein the restraining step includes a step of expanding the diameter of the restrained pipe portion after the pipe manufacturing step from that during pipe manufacturing. 18. The existing pipe rehabilitation method according to claim 17, wherein the diameter expanding step includes a step of expanding a length of one winding of the belt-shaped member in the restricted tube portion. The existing pipe rehabilitation method according to claim 18, wherein, in the expanding step, the rehabilitation tube is twisted in a direction in which the length of the one roll is expanded. A twisting force in the expanding direction is applied to a pipe portion on one end side of the rehabilitating pipe in the pipe axis direction from the constrained pipe portion or an end portion on the one end side of the constrained pipe portion. 20. The existing pipe rehabilitation method according to claim 19, wherein: In the twisting step, a tube portion on the one end side of the strip-shaped member or a strip portion of an unmade pipe continuing to the end portion on the one end side may be fed to the pipe portion on the one end side by a former press-making machine. The existing pipe rehabilitation method according to claim 20, which is characterized by the above-mentioned. 22. The existing pipe rehabilitation method according to claim 21, wherein the formerly pressed pipe making machine is slidable along the pipe axis direction. 23. In the expanding step, the end portion of the rehabilitation pipe on the side opposite to the one end side in the pipe axis direction is fixed to the existing pipe, and the existing installation according to any one of claims 18 to 22. Tube rehabilitation method. The existing pipe according to any one of claims 18 to 23, wherein in the expanding step, a joining force between the adjacent edge portions of the strip-shaped member in the constrained pipe portion is weakened as compared with that during pipe manufacturing. Rehabilitation method. 25. The joining force between the adjacent edge portions from the end portion of the rehabilitation pipe opposite to the one end side in the pipe axis direction to the constrained pipe portion is weakened as compared with the pipe manufacturing time. Existing pipe rehabilitation method. A plurality of rows of recessed grooves are formed on at least one edge of both edges of the strip-shaped member, and a plurality of rows of ridges are formed on at least the other edge of both edges. ,
In the pipe manufacturing step, fitting the mutually corresponding ridges and grooves in the adjacent edge portions,
The existing part according to claim 24 or 25, characterized in that, after the pipe manufacturing step, a root portion of a part of the ridges of a plurality of rows in the target portion for weakening the joining force of the rehabilitating pipe is cut. Tube rehabilitation method. In the pipe manufacturing step, a wire is sandwiched between side portions of the root portion between the adjacent edge portions,
27. The existing pipe rehabilitation method according to claim 26, wherein after the pipe manufacturing step, the root portion is cut by pulling the wire in the pipe axial direction. In the pipe manufacturing step, while fitting the part of the convex stripes with the corresponding concave groove via an adhesive, the convex stripes other than the part with the corresponding concave grooves via a sealant that allows sliding. 28. The existing pipe rehabilitation method according to claim 26 or 27, characterized by fitting. 29. In the restraining step, a push-spreading unit is arranged inside the constrained pipe section, and the push-spreading unit pushes the constrained pipe section outward in the radial direction. The existing pipe rehabilitation method according to item 1. 30. The existing pipe rehabilitation method according to claim 16, further comprising filling a filler between the constrained pipe portion and the existing pipe. On the outer periphery of the portion to be the constrained pipe portion in the strip-shaped member, the rehabilitating pipe is manufactured in a state where an injection tube having an injection hole is arranged,
The existing pipe rehabilitation method according to claim 30, wherein the filler is then discharged from the injection hole. The rehabilitating pipe is manufactured in a state where the filler is provided on the outer periphery of the portion to be the constrained pipe part in the strip-shaped member, and the constrained pipe part is attached to the inner peripheral surface of the existing pipe. The existing pipe rehabilitation method according to claim 30, characterized in that 33. The existing pipe rehabilitation method according to any one of claims 16 to 32, wherein in the restraining step, the restrained pipe portion is restrained with the existing pipe by an anchor bolt.

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