JP2021067057A - Backfilling method in existing pipe rehabilitation method and supporting - Google Patents

Abstract

To provide a rehabilitation method capable of preventing floating and deformation of the rehabilitation pipe during backfilling with a supporting with a simple and easy-to-install structure to suppress water flow obstruction or the like.SOLUTION: A rehabilitation tube 3 is lined along the inner surface of an existing tube 1. With the upper half of rehabilitation tube 3 is open to the deformable state, the lower half including the bottom of the rehabilitation tube 3 is pressed with a supporting 10 so as not to float and the bottom is pressed against the existing tube 1. A backfill material 5 is injected into a gap 4 between the rehabilitation tube 3 and the existing pipe 1 multiple times. After the completion of one injection of the backfill material 5, the backfill material is cured until the start of the next injection.SELECTED DRAWING: Figure 5

Description

The present invention relates to an existing pipe rehabilitation method and a support work in which a rehabilitation pipe is installed on the inner circumference of an existing pipe such as an aged sewage pipe to rehabilitate the pipe. The present invention relates to a method of injecting a material and a support work used in the method.

It is known to rehabilitate an existing pipe by lining the inner circumference of an existing pipe such as an aged sewage pipe. Generally, in this type of rehabilitation method, a backfill material such as cement milk or mortar is injected between the outer peripheral surface of the rehabilitated pipe and the inner peripheral surface of the existing pipe. At that time, a support and buoyancy prevention work is performed so that the rehabilitation pipe does not buckle or float due to the injection pressure and buoyancy of the backfill material (see Patent Documents 1 and 2).

The support works of Patent Documents 1 and 2 include an annular frame arranged in a rehabilitation pipe and a plurality of abdominal ridges provided at intervals in the circumferential direction of the outer circumference of the annular frame. Each abdomen is pressed against the inner peripheral surface of the rehabilitation tube. A vertical bar is provided at the upper end of the support work. The rod is abutted against the top of the existing pipe through a through hole formed in the top of the rehabilitation pipe.

Japanese Unexamined Patent Publication No. 10-121565 Japanese Unexamined Patent Publication No. 2013-256854

The support work of the above-mentioned patent document has a large structure and is very heavy, takes a long time to install, and has poor workability. In addition, when water is flowing in the pipe, the water level rises significantly because the cross-sectional area of the support work obstructing the flow of water is large, and the working environment deteriorates. On the other hand, if the support work has a simple structure, there is a risk that the function of preventing the rehabilitation pipe from floating and deforming at the time of backfilling cannot be achieved.
In view of such circumstances, the present invention provides a rehabilitation method and a support that can prevent the rehabilitation pipe from floating and deforming at the time of backfilling while suppressing water flow obstruction by making the support work a simple and easy-to-install structure. The purpose is.

In order to solve the above problems, the present invention
In the construction method of lining the rehabilitated pipe along the inner surface of the existing pipe to rehabilitate the existing pipe, it is a method of backfilling in the gap between the existing pipe and the rehabilitated pipe after the lining.
In a state where the upper half of the rehabilitation pipe is deformably released, the lower half including the bottom of the rehabilitation pipe is pressed so as not to float, and the bottom part is pressed against the existing pipe so that the inside of the rehabilitation pipe is pressed. The process of installing support work in
The step of injecting the backfill material into the gap between the pipes in a plurality of times, and
It is characterized by including a step of curing from the completion of one injection of the backfill material to the start of the next injection.

By filling the backfill material from the bottom to the top of the gap between the pipes in a plurality of times, the head pressure of the backfill material applied to the rehabilitation pipe at one time can be reduced. In addition, by providing a curing time each time one injection is completed, the injected backfill material can be cured to some extent and the rehabilitated pipe in the cured portion can be restrained. Therefore, even if only the lower half of the rehabilitation pipe is pressed by the support work, it is possible to prevent the rehabilitation pipe from floating or deforming.
Since it is only necessary to hold down the lower half of the rehabilitation pipe, the support work can be made into a simple and lightweight structure. Therefore, the installation work becomes easy. When water flows inside the existing pipe and thus the rehabilitation pipe, the water flow inhibition is suppressed.

At the time of the first injection of the backfill material, it is preferable to inject only the lower half of the inter-tube gap. That is, it is preferable to inject to a height of 50% or less of the diameter of the rehabilitation tube.
Since the lower half of the rehabilitation pipe is held down by the support work, it is possible to surely prevent the rehabilitation pipe from floating and deforming at the time of the first injection. At the time of the second and subsequent injections, in addition to the holding by the support work, the lower half of the rehabilitation pipe is restrained by the hardened initial backfill material, so the upper half of the rehabilitation pipe is deformed and rehabilitated. It is possible to prevent the pipe from floating, and further prevent interfacial peeling between the initial backfill material and the rehabilitated pipe. By preventing interfacial peeling, it is possible to prevent the uncured backfilling material during injection from entering between the backfilling material and the rehabilitation pipe in the previous round, and avoiding the generation of even greater head pressure. Can be done.

At the time of the first injection of the backfill material, it is preferable to inject the backfilling material up to a pressing height of the lower half portion by the support work. As a result, deformation of the rehabilitation tube due to the initial injection can be reliably prevented. It should be noted that the height of the initial injection may differ within a range of about ± 100 mm with respect to the height of the lower half presser foot.

At the time of the first injection of the backfill material, it is preferable to inject the backfilling material to a height of 20% to 30% of the pipe diameter of the rehabilitation pipe.
As a result, it is possible to reliably prevent the rehabilitation pipe from floating and deforming at the time of the first injection by using the support work having a simple structure. In addition, it is possible to reliably prevent interfacial peeling between the backfill material of the first injection and the rehabilitation pipe at the time of the second and subsequent injections.

The second and subsequent injections of the backfill material are preferably started after the backfill material injected immediately before has been substantially cured.
As a result, the backfilling material is injected next while the rehabilitation pipe is restrained by the backfilling material up to the previous round. Therefore, it is possible to more reliably prevent the rehabilitation tube from floating and deforming, and further from the interface peeling.

At the time of the second injection of the backfill material, it is preferable to inject the backfilling material to a height of 60% to 90% of the pipe diameter of the rehabilitation pipe.
Thereby, the possibility that the interfacial peeling occurs can be further reduced. Once the backfill material has hardened to the upper half, the rehabilitation tube can be injected from the third time onward with almost no deformation.
The curing time until the start of the next injection is preferably about 10 to 20 hours. As a result, the next injection can be performed after the backfill material of the previous round is sufficiently cured.

The support work is
With the bottom abdomen placed on the inner surface of the bottom of the rehabilitation tube,
With the lateral abdomen arranged on the inner surface between the middle part of the rehabilitation tube and the bottom part,
A columnar strut member having an upper end penetrating the top of the rehabilitation pipe and abutting against the top of the existing pipe and a lower end abutting against the abdomen of the bottom.
A bridge member bridged between the tension member and the side abdomen,
It is preferable that the overhanging member is provided with a pressing means for pressing the lateral abdomen toward the rehabilitation pipe, and the upper half of the rehabilitation pipe is deformably released.

The support work can surely prevent the rehabilitation pipe from floating and deforming at the time of the first injection of the backfill material. No abdominal upset is required in the upper half of the rehabilitation tube. This makes it possible to provide a simple and easy-to-install support work.

It is preferable that the side abdomen is provided on both sides of the lower half of the rehabilitation tube in the circumferential direction with the bottom abdomen interposed therebetween. As a result, both sides of the rehabilitation tube can be pressed evenly.
It is preferable that the bridging member is formed in an arc shape extending in the circumferential direction along the inner surface of the lower half of the rehabilitation tube so as to connect the lateral abdomen on both sides. As a result, the inhibition of water flow due to the support work can be further suppressed.
The central portion of the overhanging member may cover the bottom uplift, and the tension member may abut against the bottom uplift via the central portion of the overhanging member. It is more preferable that the central portion of the overhanging member is formed with a recess into which the bottom abdomen is fitted.

It is preferable that the lateral abdomen is arranged at a height of 20% to 30% of the diameter of the rehabilitation tube from the bottom of the rehabilitation tube. In line with this, it is preferable that the initial injection of the backfill material is up to a height of 20% to 30% of the diameter of the rehabilitation pipe.
As a result, it is possible to prevent the rehabilitation pipe from floating and deforming at the time of the first injection by using the support work having a simple structure.

It is preferable that the total cross-sectional area of the support work in the cross section orthogonal to the pipe axis of the rehabilitation pipe is 10% or less of the cross-sectional area of the internal space of the rehabilitation pipe. Since the support work has a simple structure, the total cross-sectional area can be reduced. By setting the cross-sectional area of the internal space of the rehabilitation pipe to 10% or less, the water flow obstruction can be surely alleviated.

According to the present invention, it is possible to prevent the rehabilitation pipe from floating and deforming at the time of backfilling while suppressing water flow obstruction and the like by making the support work a simple and easy-to-install structure.

FIG. 1 is a front sectional view taken along line I-I of FIG. 2, showing an existing pipe being rehabilitated using the support work according to the first embodiment of the present invention in a state where the backfilling process is completed. .. FIG. 2 is a side sectional view of the existing pipe along the line II-II of FIG. FIG. 3 is an enlarged front sectional view showing a lower portion of the existing pipe under rehabilitation work including the lower portion of the support work in a state at the time of injection of the first backfill material to curing. FIG. 4 is a cross-sectional view of the overhanging member of the support work along the IV-IV line of FIG. FIG. 5A is a cross-sectional view showing a state in which the initial backfill material is injected. FIG. 5B is a cross-sectional view showing a state in which the backfilling material is injected for the second time. FIG. 5C is a cross-sectional view showing a state in which the backfilling material is injected for the third time. FIG. 6 is an exploded front view of the overhanging member of the support work according to the second embodiment of the present invention. FIG. 7A is a front sectional view of an existing pipe under rehabilitation work in which the support work according to the second embodiment is applied to a rehabilitation pipe having a relatively large diameter. FIG. 7B is a front sectional view of an existing pipe under rehabilitation work in which the support work according to the second embodiment is applied to a rehabilitation pipe having a relatively small diameter. FIG. 8 is a front sectional view showing an existing pipe being rehabilitated using the support work according to the third embodiment of the present invention. FIG. 9 is a front sectional view showing an existing pipe being rehabilitated using the support work according to the ninth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment (FIGS. 1 to 5)>
FIGS. 1 and 2 show a state in which a sewer pipe buried in the ground is rehabilitated as an old existing pipe 1. The existing pipe 1 is not limited to a sewer pipe, and includes a water pipe, an agricultural water pipe, a hydraulic power transmission pipe, a gas pipe and other buried pipes, and a tunnel and the like. In the case of a tunnel, it may be just a hole dug, or the inner surface may be reinforced with segments or mortar.

The rehabilitation pipe 3 is lined along the inner surface of the existing pipe 1. For example, the rehabilitation tube 3 is a spiral tube made of a strip-shaped member (profile) having a fixed cross section and using synthetic resin as a main material. The strip-shaped member is spirally wound and the adjacent edges are joined to each other so as to make a round difference. The bottom of the rehabilitation pipe 3 is in contact with the bottom of the existing pipe 1. As a result, the flow down slope of the rehabilitation pipe 3 coincides with the flow down slope of the existing pipe 1. The top of the rehabilitation pipe 3 is separated below the top of the existing pipe 1.

As shown in FIG. 1, an inter-pipe gap 4 is formed between the existing pipe 1 and the rehabilitation pipe 3. A backfilling material 5 such as mortar is injected and filled in the inter-pipe gap 4. The backfilling material 5 includes a first backfilling material 5a from the bottom of the inter-pipe gap 4 to the middle of the lower half, a second backfilling material 5b from the middle of the lower half to the middle of the upper half, and the above. Includes the third backfill material 5c from the middle of the upper half to the upper end. A seam 5j is formed between the backfilling materials 5a and 5b and between the backfilling materials 5b and 5c, respectively.
In the backfilling process of injecting and filling the backfilling material 5, a support 10 is installed in the rehabilitation pipe 3.

<Support work>
As shown in FIGS. 1 and 2, the support work 10 includes a belly raising members 11 and 12, a tension member 20, and a bridge member 30.
The abdominal ridges 11 and 12 are arranged on the inner surface of the lower half of the rehabilitation pipe 3 and extend along the pipe axes of the existing pipe 1 and the rehabilitation pipe 3 (direction orthogonal to the paper surface in FIG. 1). Here, the lower half means a portion below the middle portion 3c in the height direction of the rehabilitation pipe 3.
The bottom abdominal ridge 11 is arranged at the bottom (lowermost portion) of the rehabilitation tube 3.

Two (pair) side abdominal raising 12 are arranged on both sides of the rehabilitation tube 3 in the circumferential direction with the bottom abdominal raising 11 interposed therebetween. Each side abdominal rise 12 is arranged in the lower lateral portion between the intermediate portion and the bottom portion of the rehabilitation tube 3. Preferably, the lateral abdominal raising 12 is arranged at a height of 20% to 30% of the _{tube diameter R 3} (FIG. 5A) of the rehabilitation tube 3 from the bottom of the rehabilitation tube 3.
Three (plural) abdominal upsets 11 and 12 are arranged apart from each other in the circumferential direction of the rehabilitation tube 3.

As shown in FIG. 2, a plurality of tension members 20 (floating prevention materials) are arranged at intervals of the existing pipe 1 and the rehabilitation pipe 3 in the pipe axis direction, preferably at substantially equal intervals.
As shown in FIGS. 1 and 2, the tension member 20 includes a tension member main body 29 and a jack 21. The tension member main body 29 is composed of, for example, a cylindrical steel pipe. The tension member main body 29 and thus the tension member 20 are vertically erected on the bottom abdomen 11 and have a columnar shape.
The upper end of the tension member main body 29 penetrates the through hole 3d formed in the top of the rehabilitation pipe 3 and is abutted against the inner surface of the top of the existing pipe 1.

A jack 21 is provided at the lower end of the tension member main body 29. The jack 21 has a base member 22, a shaft member 23, and an elevating member 24. The base member 22 is formed in a thick plate shape. The lower end of the base member 22 and thus the tension member 20 is abutted against the bottom abdomen 11 via the central retainer 31 described later.

A bolt-shaped shaft member 23 projects upward from the upper surface of the base member 22. A nut-shaped elevating member 24 is screwed onto the shaft member 23 so as to be elevated. The lower end of the tension member main body 29 is abutted against the elevating member 24. By turning the elevating member 24 to elevate and lower, the tension member main body 29 is elevated and lowered. As a result, the tension member 20 is expanded and contracted.

As shown in FIGS. 1 and 2, a bridge member 30 is provided between the tension member 20 and the raised members 11 and 12.
As shown in FIG. 3, the overhanging member 30 extends in an arc shape (arc shape) along the circumferential direction of the inner surface of the lower half portion of the rehabilitation pipe 3 so as to connect the side abdominal rises 12 at both ends. .. The tension member 20 and the raised members 11 and 12 are connected via the overhanging member 30. Half of the overhanging member 30 is laid between the tension member 20 and one side of the abdominal raising 12. The other half of the overhanging member 30 is laid between the tension member 20 and the other side abdominal raising 12.

Preferably, the bridging member 30 is formed in a long box shape with a closed interior space. As shown in FIG. 4, the cross section of the bridge member 30 is a hollow and closed quadrangle. Both ends of the overhanging member 30 in the length direction are closed. The cross section of the bridge member 30 may be a closed ring, and may be a polygon or a circle other than a quadrangle.

As shown in FIG. 3, holding bases 31 and 32 are formed at the central portion and both end portions of the overhanging member 30 in the length direction. The holding base 31 at the center has an insertion recess 31a opened downward and is formed in a gate shape, and is arranged at the bottom of the rehabilitation pipe 3. The holding base 31 and thus the central portion of the overhanging member 30 are covered with the bottom raised portion 11. The bottom abdomen raised 11 is passed through the insertion recess 31a.

A storage recess 31d is formed on the upper surface of the holding base 31. The base member 22 is fitted in the accommodating recess 31d. As a result, the rotation of the base member 22 during the operation of the jack 21 is blocked or restricted. Further, the holding base 31 is strongly pressed against the bottom abdomen 11 by the tension of the tension member 20.

The holding bases 32 at both ends each have an insertion recess 32a and are formed in an L shape. The insertion recess 32a is open to the inner surface side of the rehabilitation pipe 3 and the outer side in the circumferential direction. The side abdomen raising 12 is passed through the insertion recess 32a.
A female screw hole 32b is formed through the holding base 32.

The pressing means 40 is provided on the pressing base 32. The pressing means 40 includes a jack 51 and a holder 42. The jack 51 includes a threaded rod, and the threaded rod is screwed into the female screw hole 32b. A holder 42 is provided at a tip portion of the jack 51 facing downward. The holder 42 is formed in a U shape and covers the upper surface and both side surfaces of the lateral abdominal raising 12. As a result, the holder 42 is fitted so as not to rotate relative to the side raised portion 12.

As shown in FIG. 1, no abdominal upset is provided above the lateral abdominal uplift 12. The support work 10 does not have an abdominal raising and pressing means for pressing the upper half of the rehabilitation pipe 3 (including the upper portion and the top of the intermediate portion 3c), and also has a pedestal member for supporting the pressing means. Absent. The upper half of the rehabilitation pipe 3 is released from the support work 10 and can be deformed.
Therefore, the support work 10 has an extremely simple structure as compared with the above-mentioned patent document.
The total cross-sectional area of the support 10 (total cross-sectional area of raised 11, 12, tension member 20, overhanging member 30, pressing means 40, etc.) in the cross section orthogonal to the pipe axis of the rehabilitation pipe 3 is the rehabilitation pipe. It is 10% or less of the cross-sectional area of the internal space of 3.

<Rehabilitation method for existing pipes>
As shown in FIGS. 1 and 2, the rehabilitation pipe 3 is lined along the inner circumference of the existing pipe 1.
<Support installation process>
Next, the support work 10 is installed inside the rehabilitation pipe 3. Specifically, on the inner surface of the lower half of the rehabilitation tube 3, three abdominal raisings 11 and 12 are arranged so as to extend along the tube axis, and the laying members 30 are arranged at regular intervals in the tube axis direction. Then, the recesses 31a and 32a are raised and the 11 and 12 are fitted.

Further, the tension member 20 is erected vertically, the base member 22 at the lower end of the tension member 20 is abutted against the bottom abdomen 11 via the holding base 31, and the upper end of the tension member 20 is rehabilitated. It abuts against the top of the existing pipe 1 through 3. A through hole 3d is formed in advance at the top of the rehabilitation tube 3.
Then, the tension member 20 is extended by the jack 21 and is tensioned up and down. The tensioning force is transmitted to the bottom abdomen 11 via the holding base 31 of the overhanging member 30, and the bottom abdomen 11 is strongly pressed against the bottom of the rehabilitation pipe 3. Further, the bottom of the rehabilitation pipe 3 is strongly pressed against the bottom of the existing pipe 1.
Further, the pressing means 40 strongly presses the side abdomen 12 against the lower portion of the rehabilitation tube 3.
As a result, the lower half of the rehabilitation pipe 3 is held down by the support work 10 so as not to be levitated. The upper half of the rehabilitation tube 3 is deformably released.

As shown in FIG. 3, since the support work 10 only needs to hold the lower half of the rehabilitation pipe 3, it can be made into a simple and lightweight structure, and the installation work is easy. Further, the structure of the support work 10 is simple, and in particular, the total cross-sectional area of the support work 10 in the cross section orthogonal to the pipe axis of the rehabilitation pipe 3 is 10% or less of the cross-sectional area of the internal space of the rehabilitation pipe 3. Therefore, it is possible to sufficiently alleviate the water flow obstruction during the backfilling construction.
In addition, since the bridge member 30 has an arc shape along the inner surface of the lower half of the rehabilitation pipe 3, the water flow obstruction can be alleviated more reliably.

As shown in FIG. 4, the weight of the bridge member 30 can be reduced by making the bridge member 30 hollow. Further, by sealing the inside of the bridge member 30, it is possible to prevent water in the existing pipe 1 or the rehabilitation pipe 3 from flowing into the inside of the bridge member 30, and the bridge member 30 becomes heavy and difficult to install. It can be prevented from becoming.

<Backfill process>
Next, as shown in FIG. 5, the backfilling material 5 such as mortar is injected and filled into the gap 4 between the pipes. The backfill material 5 is injected, for example, in three times (multiple times). By performing the backfill material injection in a plurality of times, the head pressure of the backfill material applied to the rehabilitation pipe 3 can be reduced at one time.

<First injection>
As shown in FIG. 5A, the initial backfill material 5a is filled only in the lower half of the inter-pipe gap 4. That is, the initial injection is completed at a height of 50% or less of the tube diameter (inner diameter) R _{3 of the rehabilitation tube 3.} Preferably, the injection height H _5a of the initial backfill material 5a is about the height of the side abdomen raised 12. That is, the initial injection is performed up to the pressing height of the lower half of the rehabilitation pipe by the support work 10. Specifically, for the first time injection to a height of about 20% to 30% of the pipe diameter _{R 3} of the rehabilitating pipe 3.
It should be _{noted that the height H 5a} of the initial injection is allowed to differ within a range of about ± 100 mm with respect to the height of the side abdomen 12 and the height of the lower half of the rehabilitation tube.

The rehabilitation pipe 3 receives fluid pressure (head pressure) from the uncured backfill material 5 after injection, and tends to float and deform. On the other hand, as described above, since the lower half of the rehabilitation pipe 3 is pressed by the support work 10, the rehabilitation pipe 3 is lifted and deformed by the initial backfilling material 5a filled only in the lower half. Is suppressed. In particular, since the support work 10 presses not only the bottom portion of the rehabilitation pipe 3 but also the lower portion thereof, it is possible to prevent the cross section of the rehabilitation pipe 3 from being deformed so as to extend in the vertical direction and contract in the width direction. Furthermore, the final height preferably lower rehabilitating pipe half of the pressing height of the first back-filling material 5a, more preferably by 20% to 30% of the pipe diameter R ₃ of the rehabilitating pipe 3, first back-filling material The pressure from 5a can be suppressed, and the rehabilitation pipe 3 can be reliably prevented from floating and being deformed.

<Curing process (first curing)>
Curing is performed after each injection of the backfill material 5. The curing time is preferably about 10 to 20 hours. As a result, the backfill material 5 can be sufficiently cured. The rehabilitation tube 3 is partially restrained by the hardened backfill material 5. Therefore, the portion of the rehabilitation pipe 3 in contact with the hardened backfill material 5 becomes indeformable. In the initial curing after the initial injection, the lower half of the rehabilitation tube 3 is restrained and becomes indeformable.
The curing time is not limited to about 10 hours to 20 hours, and can be appropriately adjusted according to the time required for curing the backfill material.
After curing, start the next injection.

<Second injection>
As shown in FIG. 5B, preferably, the second backfill material 5b is injected over the middle portion 3c of the rehabilitation pipe 3 to the middle of the upper half portion. More preferably, the second backfill material 5b is injected until _{the height H 5b} is about 60% to 90% _{of the pipe diameter R 3 of the rehabilitation pipe 3.}
The rehabilitation pipe 3 is also subjected to fluid pressure (head pressure) from the uncured second backfill material 5b and is about to be deformed. On the other hand, as described above, since the lower half of the rehabilitation tube 3 is restrained by the hardened initial backfill material 5a, the restraining force extends to the second injection region, and the second injection region is also used. The deformation of the rehabilitation tube 3 in the above can be suppressed to a small value. Further, since the lower half of the rehabilitation pipe 3 is pressed by the support work 10, the pressure from the second backfill material 5b causes interfacial peeling between the first backfill material 5a and the rehabilitation pipe 3. Can be prevented. As a result, the head pressure can be prevented from further increasing by preventing the second backfill material 5b from flowing between the first backfill material 5a and the rehabilitation pipe 3, and the deformation of the rehabilitation pipe 3 can be prevented more reliably.

<Second curing>
After the completion of the second injection, the curing process waits for the second backfill material 5b to cure. By curing, part up to the middle of the upper half from the bottom of the rehabilitating pipe 3, preferably 60% to 90% of the portion up to the height of the tube diameter R ₃ of the rehabilitating pipe 3, is constrained back-filling material 5a, by 5b It becomes impossible to deform.
Then, a third injection is performed.

<Third injection>
As shown in FIG. 5C, the third backfill material 5c is injected up to the upper end of the inter-pipe gap 4. As a result, the entire area of the inter-pipe gap 4 is filled with the backfill material 5.
As described above, at the time of the third injection, since the portion of the rehabilitation tube 3 is restrained from the bottom to the middle of the upper half, the rehabilitation tube 3 is hardly deformed and is injected without causing interfacial peeling. It is possible.
In this way, the backfilling process is completed and the existing pipe 1 is rehabilitated.

<Removal process>
After that, the support work 10 is dismantled and removed. Since the support work 10 has a simple structure and a small number of parts, the removal work is easy.

Next, other embodiments of the present invention will be described. In the following embodiments, the same reference numerals are given to the drawings for configurations that overlap with those described above, and the description thereof will be omitted.
<Second Embodiment (FIGS. 6 to 7)>
As shown in FIG. 6, in the second embodiment, the bridge member 30B is divided into two pressing pieces 34 at the central portion. An L-shaped holding base portion 34a is formed at the opposing ends of the two holding pieces 34. As shown in FIG. 7, the two holding base portions 34a are combined to form a central holding base 31B for the bottom abdominal raising 11.

As shown in FIGS. 7A and 7B, by adjusting the angle between the two pressing pieces 34 and adjusting the size of the gap between the two pressing pieces 34, the size of the gap between the two pressing pieces 34 can be adjusted. The same bridge member 30B and thus the same support work 10B can be applied to the rehabilitation pipes 3 having different pipe diameters.

<Third Embodiment (FIG. 8)>
As shown in FIG. 8, in the support work 10C of the third embodiment, the overhanging member 30C extends horizontally straight at right angles to the lower portion of the tension member 20, so that the tension member 20 and the side thereof are side of each other. It is bridged between the abdomen and the abdomen 12. At the intersection of the overhanging member 30C and the tension member 20, an orthogonal clamp 50 for connecting the members 30C and 30 so as to be orthogonal to each other is provided.

Pressing means 40C are provided at both ends of the overhanging member 30C. The pressing means 40C is composed of a jack including a bolt 43 and a nut 44. The axis of the bolt 43 coincides with the extending direction of the overhanging member 30C. A U-shaped holder 42 is connected to the tip of the bolt 43 so that the angle can be adjusted. The holder 42 covers the upper surface and both side surfaces of the lateral abdominal raising 12. By turning the nut 44 to advance and retreat the bolt 43, the side abdomen raising 12 can be pressed against the inner surface of the lower portion of the rehabilitation pipe 3.

The lower end portion of the tension member 20 is directly abutted against the bottom abdominal raising 11 without the intervention of the hang-up member. The base member 25 at the lower end of the tension member 20 is formed in a U shape and covers the upper surface and both side surfaces of the bottom raised portion 10.

<Fourth Embodiment (Fig. 9)>
As shown in FIG. 9, in the support work 10D of the fourth embodiment, the pair (plurality) of the overhanging members 30D is obliquely downward from the intermediate portion of the tension member 20 toward the corresponding lateral abdominal raising 12. By extending to, it is bridged between the tension member 20 and the side abdominal raising 12. A clamp 51 is provided at the intersection of the overhanging member 30D and the tension member 20. The clamp 51 holds the intersection position and angle of the overhanging member 30D with respect to the tension member 20.

At the lower end of each bridge member 30D, a pressing means 40D similar to that of the third embodiment is provided. The bolt 43 of the pressing means 40D is in line with the laying member 30D. A U-shaped holder 42 at the tip of the bolt 43 is fitted to the side raised portion 12.
By turning the nut 44, the side abdomen 12 is pressed against the rehabilitation pipe 3, and the lower end (base member 25) of the tension member 20 is directly abutted against the bottom abdomen 11. , The same as the third embodiment.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the number of injections of the backfill material 5 is not limited to three in the embodiment, but may be two or four or more.
The time of the curing process does not necessarily have to be set to the time until the backfill material of the immediately preceding time is almost cured. The backfilling material may be injected in the next round while the backfilling material in the previous round is semi-cured or uncured. By doing so, the seam 5j may not be formed. The time of the curing process may be less than 10 hours.
The number of abdomen is not limited to three, and may be four or more. One or more abdomen may be provided between the bottom abdomen 11 and the side abdomen 12 closest to the middle 3c.
The rehabilitation tube 3 is not limited to a spiral tube, and may be formed of a tube made of a synthetic resin having shape memory.

The present invention can be applied to, for example, rehabilitation of aged sewer pipes.

1 Existing pipe 3 Rehabilitation pipe 3d Through hole 4 Inter-pipe gap 5 Backfill material 5a First backfill material 5b Second backfill material 5c Third backfill material 5j Joint 10 Support work 10B, 10C, 10D Support work 11 Bottom abdomen Wake up (raise up)
12 Side abdomen (abdomen)
20 Stretch member 21 Jack 29 Stretch member body 30 Strut member 30B, 30C, 30D Strut member 31, 31B Central presser base 32 End retainer 34 Press piece 40 Pressing means 40B, 40C, 40D Pushing means 42 Holder 50 , 51 Clamp H _5a First injection height H _5b Second injection height R ₃ Tube diameter

Claims (10)

In the construction method of lining the rehabilitated pipe along the inner surface of the existing pipe to rehabilitate the existing pipe, it is a method of backfilling in the gap between the existing pipe and the rehabilitated pipe after the lining.
In a state where the upper half of the rehabilitation pipe is deformably released, the lower half including the bottom of the rehabilitation pipe is pressed so as not to float, and the bottom part is pressed against the existing pipe so that the inside of the rehabilitation pipe is pressed. The process of installing support work in
The step of injecting the backfill material into the gap between the pipes in a plurality of times, and
A backfilling method in an existing pipe rehabilitation method, which comprises a step of curing from the completion of one injection of the backfilling material to the start of the next injection. The backfilling method according to claim 1, wherein when the backfilling material is first injected, injection is performed only in the lower half of the inter-tube gap. The backfilling method according to claim 1 or 2, wherein when the backfilling material is injected for the first time, the backfilling material is injected up to the pressing height of the lower half portion by the support work. The backfilling method according to any one of claims 1 to 3, wherein when the backfilling material is first injected, the backfilling material is injected to a height of 20% to 30% of the diameter of the rehabilitation pipe. The backfilling method according to any one of claims 1 to 4, wherein the second and subsequent injections of the backfilling material are started after the backfilling material injected immediately before is substantially cured. The backfill according to any one of claims 1 to 5, wherein when the backfilling material is injected for the second time, the backfilling material is injected to a height of 60% to 90% of the diameter of the rehabilitation pipe. Method. The support work according to any one of claims 1 to 6.
With the bottom abdomen placed on the inner surface of the bottom of the rehabilitation tube,
With the lateral abdomen arranged on the inner surface between the middle part of the rehabilitation tube and the bottom part,
A columnar strut member having an upper end penetrating the top of the rehabilitation pipe and abutting against the top of the existing pipe and a lower end abutting against the abdomen of the bottom.
A bridge member bridged between the tension member and the side abdomen,
The bridge member is provided with a pressing means for pressing the lateral abdomen toward the rehabilitation pipe, and the upper half of the rehabilitation pipe is deformably released. Support work. The side abdomen is provided on both sides of the lower half of the rehabilitation tube in the circumferential direction with the bottom abdomen interposed therebetween.
The laying member is formed in an arc shape extending in the circumferential direction along the inner surface of the lower half of the rehabilitation tube so as to connect the lateral abdomen on both sides, and the central portion of the laying member is formed. Covering the bottom abdomen,
The support work according to claim 7, wherein the tension member abuts on the bottom abdomen via a central portion of the hang-up member. The support work according to claim 7 or 8, wherein the lateral abdomen is arranged at a height of 20% to 30% of the pipe diameter of the rehabilitation pipe from the bottom of the rehabilitation pipe. Any one of claims 7 to 9, wherein the total cross-sectional area of the support work in the cross section orthogonal to the pipe axis of the rehabilitation pipe is 10% or less of the cross-sectional area of the internal space of the rehabilitation pipe. Support work described in the section.

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