JP2019124282A - Existing pipe regeneration method - Google Patents

Abstract

To surely prevent axial elongation and contraction of a regeneration pipe lined on an existing pipe, in an existing pipe regeneration method.SOLUTION: In a regeneration method of an existing pipe 2, following processes are successively executed, that is, a regeneration pipe insertion process for inserting a resin regeneration pipe 3 in a collapsed state to the existing pipe 2, a long member insertion process for inserting a long member 10 along an axial direction of the existing pipe 2, here, the long member is constituted by arranging a plurality of sealing bags 11 in which an adhesive agent 15 (binding material) is sealed, in a longitudinal direction, a process for lining the regeneration pipe 3 on an inner periphery of the existing pipe 2 by expanding a diameter of the regeneration pipe 3, here, the sealing bags 11 rupture so that the adhesive agent 15 is supplied to a clearance between the existing pipe 2 and the regeneration pipe 3, and a sealing process for sealing the whole periphery of a pipe end 2a of the existing pipe 2 and the regeneration pipe 3 by the cut-off material 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of rehabilitating an existing pipe connected to a manhole.

  In sewerage, etc., manholes separated are connected by a sewer pipe buried in the ground. When the existing sewer pipe (hereinafter referred to as the existing pipe) is aged and cracked, the sewage leaks into the ground, and the underground water intrudes. Therefore, the existing pipe is rebuilt by lining the rebuilt pipe inside the old existing pipe.

  A method of lining a relatively small diameter existing pipe will be briefly described. A resin rejuvenation tube having a memory shape with a circular cross-sectional shape is crushed into a omega cross-sectional shape and passed through the existing pipe, heating steam is supplied to this rejuvenation tube, the cross-sectional circularity is restored, and the diameter is expanded by compressed air. Line the pipe inside the existing pipe.

When damage to the existing pipe is severe, the rehabilitated pipe can not completely follow the unevenness of the inner surface of the existing pipe, and a gap may be generated between the rehabilitated pipe and the existing pipe. Therefore, the underground water which entered from the crack etc. of the existing pipe will enter into the above-mentioned crevice, will flow along a rehabilitating pipe, and will flow into a manhole. In order to prevent the flow of groundwater into the manhole, it is general to seal the entire circumference between the end of the existing pipe and the rehabilitated pipe with a water blocking material.
However, since the rehabilitating pipe extends continuously continuously and the amount of expansion and contraction in the axial direction due to a change in temperature is large, the water blocking material may be broken.

According to FIG. 6 of Patent Document 1, after lining the retread pipe to the existing pipe, a filler such as urethane or cement milk is inserted between the retread pipe and the existing pipe from the hole formed in the end peripheral wall of the retread pipe. A method is disclosed that injects into the gap to shut off the passage of the gap.
Paragraph 0003 of Patent Document 2 discloses the following water stopping method as a prior art. That is, a water blocking material obtained by impregnating a glass mat with an epoxy resin is attached to the inside of the end of the existing pipe, and the diameter of the rehabilitating pipe in the lining step makes the water blocking material the rehabilitated pipe and the existing pipe. Between the two, this blocks the passage of the gap between the rejuvenated pipe and the existing pipe.

Unexamined-Japanese-Patent No. 2015-1886898 JP 2004-69053 A

  In the methods of Patent Documents 1 and 2, since only the end of the existing pipe and the end of the retread pipe are bonded, a load accompanying axial expansion and contraction in the middle region of the retread pipe is concentratedly applied to the bonded portions at both ends As in the case of providing a water blocking material at the end of the existing pipe, the bonded portion may be broken.

In order to solve the above problems, the present invention relates to an existing pipe rehabilitating method, including a rehabilitating pipe inserting step of inserting a crushed resin rehabilitating pipe into the existing pipe, and axial expansion and contraction of the rehabilitating pipe relative to the existing pipe. And inserting the elongated member including a constraining material that prohibits binding along the axial direction of the existing pipe, and expanding the diameter of the renovated pipe, thereby lining the renovated pipe on the inner periphery of the existing pipe And a lining step of pressing the elongated member with the existing pipe and the rejuvenated pipe.
According to the above method, since the long member containing the constraining material is provided along the axial direction of the existing pipe, the load in the expansion and contraction direction of the renovated pipe accompanying the temperature change can be dispersed and carried by the constraining material. Expansion or contraction can be reliably suppressed or inhibited. As a result, for example, when a water blocking material is provided at or near the end of the existing pipe, the breakage can be prevented.

Preferably, the constraining material is an adhesive, and the elongated member has a sealing bag for sealing the adhesive, and the elongated member is compressed by the existing pipe and the rehabilitating pipe in the lining step. When the sealing bag is ruptured, the adhesive is supplied to the gap between the existing pipe and the rejuvenated pipe.
According to the above method, since the adhesive is supplied to the gap between the existing pipe and the rehabilitating pipe, at least a part of the gap can be sealed, and the flow of water toward the manhole through this gap can be suppressed or blocked. can do.
In addition, since the adhesive can be supplied by bursting the sealing bag containing the adhesive when expanding the diameter of the rehabilitation pipe, the adhesive can be easily supplied to the gap between the existing pipe and the rehabilitation pipe.

Preferably, a plurality of the above-mentioned enclosing bags are arranged side by side in the longitudinal direction of the above-mentioned long member.
According to the above method, the adhesive can be supplied without being biased in the axial direction.

Preferably, the adhesive is a two-component adhesive, and each of the sealing bags has first and second bag portions adjacent in the width direction of the elongated member, and the first bag portion The main agent of the adhesive is sealed in the second bag portion, and the curing agent is sealed in the second bag portion, and the first member is compressed by the existing pipe and the rehabilitating pipe in the lining step. The sack portion and the second sack portion are ruptured, and the main agent and the curing agent are mixed and supplied to the gap between the existing pipe and the rejuvenated pipe.
According to the above method, the curing time can be stabilized without being greatly affected by the temperature by using the two-component adhesive.

Preferably, the elongated member is a thin-walled tube, and the tubes are partitioned at intervals in the longitudinal direction to form the plurality of encapsulating bags.
According to the above method, the plurality of enclosed bags can be provided at low cost by partitioning the tubes.

In another aspect, the constraining material is an adhesive, the elongated member is an elongated sheet impregnated with the adhesive, and the elongated sheet is the existing pipe and the renovated pipe in the lining step. When compressed, the adhesive is supplied to the gap between the existing pipe and the rejuvenated pipe.
According to the above method, by using the adhesive, as in the case of using the long member having the sealing bag, the effect of suppressing the axial expansion and contraction of the rehabilitating pipe and the water blocking effect can be obtained.

In still another aspect, the restraint material is a friction material, the long member is a long sheet formed of the friction material, and in the lining step, the long sheet is the existing pipe and the rehabilitation pipe. The pressure between the existing pipe and the rehabilitated pipe is enhanced by being compressed.
According to the said method, the axial direction expansion-contraction of a rejuvenation pipe | tube can be suppressed by the elongate sheet | seat which consists of friction material.

Preferably, the regenerating pipe is crushed into an omega shape, and the elongated member is inserted into the recess.
According to the above method, the long member can be stably held halfway through the diameter expansion step of the rejuvenated pipe.

Preferably, the elongated member is inserted over the entire length of the existing pipe.
According to the said method, the restraint effect of the retreading pipe | tube by an elongate member can be exhibited maximally.
Preferably, after the lining step, the method further includes a sealing step of sealing the entire end of the existing pipe and the retreading pipe with a waterproof material over the entire circumference.

  According to the present invention, expansion and contraction in the axial direction of the regenerating pipe with respect to the existing pipe can be suppressed or inhibited by the restraint material of the elongated member extending in the axial direction of the existing pipe.

It is a longitudinal cross-sectional view which shows the existing pipe rehabilitating method which concerns on 1st Embodiment of this invention in order of a process, (A) is a state which inserted the rehabilitated tube of cross section Ω shape in the existing pipe, (B) enclosed adhesive. (C) a state in which the lining to the existing pipe is completed by expanding the diameter of the regenerating pipe, (D) a state in which the sealing of the pipe end of the existing pipe is completed. Show It is a cross-sectional view which follows the II-II line of FIG. 1 (B). It is a cross-sectional view which follows the III-III line of FIG.1 (C). It is a top view which shows a part of said elongate member. It is a top view which shows the other example of an elongate member. It is the FIG. 2 equivalent view which shows the existing pipe rehabilitation method which concerns on 2nd Embodiment of this invention.

Hereinafter, the existing pipe rehabilitating method according to the first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a part of two manholes 1 separated from the sewer, and an existing pipe 2 whose both ends are connected to these manholes 1 and deteriorated due to long-term use. The existing pipe 2 penetrates the peripheral wall 1 a of the manhole 1. The pipe end 2a of the existing pipe 2 is at a position substantially coincident with the inner periphery of the peripheral wall 1a. The lowest portion of the inner periphery of the tube end 2 a is located at substantially the same height as the upper surface of the bottom plate 1 b of the manhole 1.

Hereinafter, the method of reworking the existing pipe 2 will be described in order.
Step of inserting the retreading tube First, as shown in FIG. 1 (A) and FIG. 2, the elongated retreading tube 3 crushed into a cross-sectional Ω shape is pulled with a wire from one manhole 1 to the other manhole 1 By this, the entire length of the existing pipe 2 is inserted. Both ends of the rehabilitation pipe 3 are made to project from the pipe end 2 a of the existing pipe 2. The rehabilitation pipe 3 is made of a vinyl chloride resin having a shape memory function. The original cross-sectional shape of the rehabilitating pipe 3 is circular, is crushed flat, and is further folded in half to form an Ω-shaped cross section.

Step of Inserting Long Member Next, as shown in FIG. 1 (B) and FIG. 2, the long member 10 in which the adhesive 15 (restraint material) is enclosed is inserted over the entire length of the existing pipe 2. Here, the term "full length" includes cases where the lengths of the long member 10 and the existing pipe 2 are equal, and of course there is a difference of less than 10%.
As the adhesive 15, a high-strength adhesive excellent in water resistance and durability, low in viscosity and good in wet adhesion is used. For example, epoxy resin, acrylic resin, polymer cement and the like are used. In the present embodiment, a one-component adhesive is used.

  As shown in FIG. 4, the elongated member 10 has a plurality of encapsulating bags 11 arranged in the longitudinal direction by partitioning the elongated resin tube in the longitudinal direction at equal intervals. In this embodiment, it is partitioned every 1 m, and the width is 80 mm and the height is 50 mm. Each sealing bag 11 is filled with an adhesive 15. The long member 10 is thin (1 mm or less) and can be ruptured by an external force.

  A wire 18 (shown only in FIG. 1B) is connected to one end of the elongated member 10, and the wire 18 is inserted into a recess 3x (shown only in FIG. 2) of the retreading pipe 3 having an Ω shape in cross section. By advancing from one manhole 1 to the other manhole 1 and pulling this wire 18, the long member 10 is inserted into the recess 3x of the rehabilitating pipe 3.

In the lining process , high temperature steam is flowed from one end to the other end of the retread pipe 3 to return the retread pipe 3 to the shape memorized circular cross section, and further compressed air is supplied to expand the diameter, as shown in FIG. As shown in 3, the rehabilitated pipe 3 is lined inside the existing pipe 2. At this time, the diameter is excessively enlarged to increase the resistance between the rehabilitating pipe 3 and the existing pipe 2. This makes it difficult for the regenerating pipe 3 to shift in the horizontal direction. Further, even if the rehabilitating pipe 3 is cooled and contracted, a portion excessively expanded in diameter from the existing pipe 2 is caught on the end of the pipe and is hardly contracted.

When the diameter of the rehabilitation pipe 3 is expanded toward the existing pipe 2, the long member 10 is compressed between the rehabilitation pipe 3 and the existing pipe 2, the encapsulating bag 11 is ruptured, and the adhesive 15 is rehabilitated. Is supplied to the gap between the pipe and the existing pipe 2.
In addition, since the elongate member 10 is inserted in the recessed part 3x of the rehabilitation pipe 3, it is hold | maintained to the middle of the diameter expansion of the rehabilitation pipe 3 stably.

Sealing Step Next, as shown in FIG. 1 (D), the rehabilitating pipe 3 is cut from the pipe end 2a of the existing pipe 2 leaving a predetermined length. Thereby, the rejuvenation pipe 3 has the projecting end 3a in FIG.
Next, between the pipe end 2a of the existing pipe 2 and the projecting end 3a of the regenerating pipe 3 is sealed with a waterproof material 20 over the entire circumference. The water blocking material 20 is made of, for example, putty such as quick-drying epoxy resin or quick setting mortar.

According to the rehabilitating method, the adhesive 15 supplied to the gap between the existing pipe 2 and the rehabilitating pipe 3 can play a role of water stop and adhesion due to its effect.
First, the water stop function will be described. Since the adhesive 15 is filled in the gap between the existing pipe 2 and the regenerating pipe 3, at least a part of the passage of the gap can be blocked. Therefore, it is possible to prevent the ground water which has entered the gap from the crack of the existing pipe 2 and flowed along the rehabilitating pipe 3 from flowing into the manhole 1 without inhibiting. In the present embodiment, since the water blocking material 20 is further formed at the end of the existing pipe 2, the water can be more reliably stopped.

  Next, the adhesive function of the adhesive will be described. As described above, since the existing pipe 2 and the rehabilitating pipe 3 are bonded and fixed by the adhesive 15, the rehabilitating pipe 3 is restrained by the existing pipe 2 and the thermal expansion and the thermal contraction in the axial direction are inhibited. Therefore, breakage or cracking of the water blocking material 20 due to axial expansion and contraction of the rehabilitating pipe 3 can be prevented. And since the adhesive agent 15 is distribute | arranged over the full length of the existing pipe | tube 2, the expansion-contraction load of the axial direction of the regenerating pipe 3 can be disperse | distributed, and it can bear, and expansion or contraction of the regenerating pipe 3 can be prevented much more reliably.

  In the case of using a two-component adhesive, for example, in the case of using “E2601” manufactured by Konishi Co., Ltd. as a low viscosity epoxy resin for crack injection, a long member 10 ′ shown in FIG. 5 is used. The elongated member 10 'is divided into thin resin tubes at equal intervals in the longitudinal direction to form a plurality of sealing bags 11', and the sealing bag 11 'is formed in the width direction of the tube (the existing pipe 2 The first and second bag portions 11a and 11b adjacent to each other are formed by partitioning in the circumferential direction. The first bag portion 11a is filled with an epoxy resin main agent 15a, and the second bag portion 11b is filled with a curing agent 15b.

The long member 10 'is inserted into the recess 3x of the rejuvenated pipe 3 having the Ω cross section in the same manner as the long member 10 of FIG. The long member 10 'is compressed when the diameter of the retread pipe 3 is compressed, and the bag portions 11a and 11b rupture, and the main agent 15a and the curing agent 15b are mixed and supplied to the gap between the existing pipe 2 and the retread pipe 3 Ru.
The two-component type adhesive is advantageous because it cures at room temperature and the curing time does not depend on the environmental temperature.

  FIG. 5 shows a second embodiment of the present invention. The long member 10 '' of this embodiment is made of a long sheet impregnated with an adhesive (restraint material). The long sheet is made of glass fiber or the like, and the concave portion of the rehabilitating pipe 3 The elongated member 10 ′ ′ is compressed at the time of expansion of the renovated pipe 3, and the impregnated adhesive is supplied to the gap between the existing pipe 2 and the renovated pipe 3.

  The long member 10 ′ ′ may be a long sheet made of rubber (friction material). This long member 10 ′ ′ is compressed by the diameter expansion of the retreading pipe 3, and the axial expansion and contraction of the retreading pipe 3 with respect to the existing pipe 2 The friction resistance of

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention.
The sealing bag containing the adhesive may be connected by a string or a thin sheet.
The "expanding" of the rehabilitated tube involves a return to a circular cross-section. For example, it includes the case where the renovated pipe is restored from the collapsed state by the high temperature steam to a stored circular cross-section and the outer diameter of the restored renovated pipe is equal to the inner diameter of the existing pipe.
The existing pipe may be not only a sewage pipe but also a cable protection pipe or the like.

  The present invention can be applied to a method of reworking existing pipes such as sewers.

DESCRIPTION OF SYMBOLS 1 Manhole 2 Existing pipe 2a Pipe end 3 Hardened pipe 3a Protruding end 10, 10 ', 10''Long member 11, 11' Encapsulation bag 11a 1st bag part 11b 2nd bag part 15 Adhesive agent 15a Main agent 15b Hardening agent 20 Water blocking material

Claims (10)

A retreading pipe inserting step of inserting the crushed resin retreading pipe into the existing pipe;
An elongated member inserting step of inserting an elongated member including a constraining material which prohibits the expansion and contraction in the axial direction of the renovated pipe with respect to the existing pipe, along the axial direction of the existing pipe;
Lining the rehabilitating pipe to the inner periphery of the existing pipe by expanding the diameter of the rehabilitating pipe, and lining the squeezing member by the existing pipe and the rehabilitating pipe;
The existing pipe restoration method characterized by having.   The restraint material is made of an adhesive, and the elongated member has a sealing bag for sealing the adhesive, and the elongated member is compressed by the existing pipe and the rehabilitation pipe in the lining step. The method according to claim 1, wherein the sealing bag is ruptured and the adhesive is supplied to the gap between the existing pipe and the regenerating pipe.   3. The existing pipe rehabilitating method according to claim 2, wherein a plurality of the sealing bags are arranged side by side in the longitudinal direction of the long member. The adhesive is a two-component adhesive, and each of the sealing bags has first and second bag portions adjacent in the width direction of the long member, and the adhesive is attached to the first bag portion. The main agent of the agent is enclosed, and the curing agent is enclosed in the second bag portion,
When the elongated member is compressed by the existing pipe and the retreading pipe in the lining step, the first bag portion and the second bag portion rupture, and the main agent and the curing agent are mixed. The existing pipe regenerating method according to claim 3, wherein the existing pipe and the regenerating pipe are supplied to a gap between the existing pipe and the regenerating pipe.   5. The plurality of enclosed bags according to claim 3, wherein the elongated member comprises a thin-walled tube, and the tubes are partitioned at intervals in the longitudinal direction to form the plurality of enclosed bags. Existing pipe rehabilitation method. The constraining material is an adhesive, and the elongated member is an elongated sheet impregnated with the adhesive.
The adhesive is supplied to the gap between the existing pipe and the rehabilitating pipe when the long sheet is compressed by the existing pipe and the rehabilitating pipe in the lining step. Existing pipe rehabilitating method. The restraint material is a friction material, and the long member is a long sheet formed of the friction material,
The friction between the existing pipe and the rehabilitating pipe is enhanced by compressing the long sheet by the existing pipe and the rehabilitating pipe in the lining step, thereby increasing the friction between the existing pipe and the rehabilitating pipe. How to rehabilitate the tube.   The existing pipe rejuvenation method according to any one of claims 1 to 7, wherein the resurrection pipe is crushed into an Ω shape, and the long member is inserted in the recess.   The said elongate member is inserted over the full length of the said existing pipe | tube, The existing pipe restoration method in any one of the Claims 1-8 characterized by the above-mentioned.   10. The method according to any one of claims 1 to 9, further comprising, after the lining step, a sealing step of sealing the entire end of the existing pipe with the retreading pipe with a water blocking material. The existing pipe restoration method described in.

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