JP2019124281A - Existing pipe regeneration method - Google Patents

Abstract

To improve adhesion strength of an adhesive agent injected between an existing pipe and a regeneration 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 lining process for lining a resin regeneration pipe 3 on an inner side of the existing pipe 2 while expanding its diameter, here, a tube 10 is inserted between the existing pipe 2 and the regeneration pipe 3 in the lining process, a sealing process for sealing the whole periphery between a pipe end 2a of the existing pipe 2 and the regeneration pipe 3 by a cut-off material 20, an adhesive primer injection process for injecting an adhesive primer between the existing pipe 2 and the regeneration pipe 3 through the tube 10, and an adhesive agent injection process for injecting an adhesive agent between the existing pipe 2 and the regeneration pipe 3 through the tube 10.SELECTED DRAWING: Figure 4

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, the entire circumference of the existing pipe is sealed with a water blocking material between the pipe end and the rehabilitated pipe.
However, since the rehabilitating pipe extends continuously continuously, and the amount of axial expansion and contraction due to the change in temperature is large, the water blocking material may be broken, and the inflow of ground water can not be reliably prevented.

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 method of Patent Document 1, the filler is injected through the hole formed in the end peripheral wall of the retread pipe, but the work must be performed in a narrow space in the end of the retread pipe, and the workability is bad .
In the method of Patent Document 2, the epoxy resin is deteriorated by the heat of the rejuvenation pipe in the lining process.

In order to solve the problems of Patent Documents 1 and 2, the present applicant has developed the existing pipe restoration method described in Japanese Patent Application No. 2016-139206 (filing date: July 14, 2016). In this rehabilitating method, after lining the rehabilitating pipe, an adhesive is injected into the gap between the end of the existing pipe and the rehabilitating pipe. The hardened adhesive can prevent water entering from cracks of the existing pipe, etc. from flowing out from the end of the existing pipe through the above-mentioned gap, and prohibits axial expansion and contraction of the rehabilitated pipe and breaks the water blocking material You can prevent.
However, if the temperature of the rehabilitating pipe is lowered more than expected, the load accompanying the radial contraction of the rehabilitating pipe acts on the adhesive, which may cause the rehabilitating pipe to peel off from the adhesive and eventually to peel off from the existing pipe Be
Therefore, the present applicant has made further improvements and arrived at the present invention.

In order to solve the above problems, the present invention relates to an existing pipe rehabilitating method,
Lining process of lining a resin-made rehabilitating pipe with the diameter expansion inside the existing pipe,
An adhesion primer injection step of injecting an adhesion primer from the end of the existing pipe into the gap between the existing pipe and the rehabilitated pipe after the lining step;
An adhesive injection step of injecting an adhesive from the end of the existing pipe into the gap between the existing pipe and the rehabilitating pipe after the adhesive preliner injection step;
It is characterized by having.

According to the above method, the adhesive can be injected with good workability from the end of the existing pipe. The injected adhesive blocks the passage of the gap between the existing pipe and the rejuvenated pipe, and thus can exert a water blocking function. Moreover, expansion and contraction due to temperature change of the rehabilitated pipe can be inhibited, and when the water blocking material is provided at the pipe end of the existing pipe, its destruction can be prevented.
In addition, since the adhesive primer is injected before the adhesive injection to treat the outer periphery of the rehabilitating tube, the adhesion strength between the adhesive and the rehabilitating tube can be greatly enhanced, and the temperature at which the rehabilitating tube is usually assumed Even in a lower situation, it is possible to prevent the retread pipe from coming off from the adhesive due to radial contraction, and maintain the adhesion between the existing pipe and the retread pipe over a long period of time.

Preferably, a tube having an insertion portion from the tip to a predetermined length and a lead-out portion to be the remaining portion is prepared, and in the lining step, the insertion portion of the tube is inserted from the existing pipe to the shaft end of the existing pipe In the state of being inserted in the direction, by expanding the diameter of the rehabilitation pipe, the insertion portion is sandwiched between the existing pipe and the rehabilitation pipe, and the lead-out portion is led out from the pipe end of the existing pipe The adhesive primer and the adhesive are injected into the gap between the existing pipe and the rejuvenated pipe through the tube.
According to the above method, by using the tube, the adhesion primer and the adhesive can be injected smoothly.

Preferably, the tube is inserted between the existing tube and the rejuvenated tube with the linearly extending wire inserted, and the wire is withdrawn before the adhesive primer injection step.
According to the above method, the tube can be reliably inserted along the axial direction of the existing tube by the wire, and the tube can be prevented from being crushed.

Preferably, the tube is disposed between the top of the existing pipe and the top of the retread pipe.
According to the above method, the adhesive primer and the adhesive can be flowed from the top to the bottom of the pipe, and the adhesive primer and the adhesive can be supplied all around the gap between the existing pipe and the rehabilitating pipe.

Preferably, the distal end of the insertion portion of the tube is closed, and a plurality of discharge portions are formed at intervals in the axial direction on the peripheral wall of the insertion portion, and in each discharge portion, the intervals in the circumferential direction A plurality of discharge ports are formed, and the adhesive primer and the adhesive are discharged from the discharge ports.
According to the above method, the adhesive primer and the adhesive can be supplied over a wide range.

Preferably, after the lining step, before the adhesion primer injection step, the method further comprises a sealing step of sealing the entire circumference between the pipe end of the existing pipe and the rehabilitated pipe with a water blocking material, The lead-out portion of the tube is led out of the water blocking material.
According to the above method, the water blocking material formed at the end of the existing pipe can prevent the adhesion primer and the adhesive from leaking out of the end of the existing pipe. In addition, since the adhesive and the water blocking material cooperate with each other to stop the water, it is possible to reliably prevent the water entering from the crack of the existing pipe, etc. from flowing out from the end of the existing pipe through the gap. .

Preferably, the water blocking material has a recess near and around the outlet of the tube, and after the adhesive injection step, the outlet of the tube is cut at the bottom of the recess and the recess is added Fill with waterproof material.
According to the above method, the open end of the tube can be closed.

  ADVANTAGE OF THE INVENTION According to this invention, the injection | pouring operation | work of the adhesive agent to an existing pipe | tube and a retreading pipe | tube can be done with good workability, and adhesive strength can be maintained over a long period of time.

In the existing pipe rehabilitation method concerning one embodiment of the present invention, it is a longitudinal section showing the state in the middle of a lining process, ie, the state where the rejuvenation pipe of cross section Ω shape was inserted in the existing pipe. It is a longitudinal cross-sectional view which shows the state which the lining process completed in the rehabilitating method, ie, while expanding the diameter of the retreading pipe to a cylindrical shape, lining the existing pipe, and inserting the tube between the retreading pipe and the existing pipe. . Longitudinal section showing a state in which the sealing step of the rehabilitating method is completed, that is, the rehabilitating pipe is cut with a predetermined amount of projection, and the pipe end of the existing pipe and the protruding end of the rehabilitating pipe are sealed FIG. FIG. 7 is a longitudinal cross-sectional view schematically showing the steps of injecting an adhesive primer through the tube and injecting an adhesive in the same remediation method. It is a longitudinal cross-sectional view which shows the state which the finishing process of the rehabilitating method completed, ie, the state which cut | disconnected the said tube and sealed the opening end with the additional waterproof material. It is a cross-sectional view which follows the VI-VI line of FIG. It is a cross-sectional view which follows the VII-VII line of FIG. It is a side view of the above-mentioned tube. FIG. 9 is an enlarged view of a portion IX of FIG. 8, in which (A) is a longitudinal sectional view and (B) is a transverse sectional view. FIG. 9 is an enlarged view of a portion X in FIG. 8, in which (A) is a longitudinal sectional view and (B) is a transverse sectional view. FIG. 11 is a cross-sectional view showing a method of forming a closed end of the tube shown in FIG. 10;

Hereinafter, a method of reworking an existing pipe according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a part of a manhole 1 of a sewer and an existing pipe 2 having one end connected to the manhole 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. The other end of the existing pipe 2 is also connected to the other manhole 1 in the same manner.

Hereinafter, the method of reworking the existing pipe 2 will be described in order.
Lining process (first stage)
First, as shown in FIG. 1 and FIG. 6, by inserting the long restructured pipe 3 crushed into a cross-sectional Ω shape from one manhole 1 to the other manhole 1, the entire length of the existing pipe 2 is inserted Do. 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.

Lining process (second stage)
As shown in FIG. 2 and FIG. 7, the high temperature steam is flowed from one end to the other end of the retreading pipe 3 to return the retreading pipe 3 to a shape memorized circular cross section, and further compressed air is supplied to expand the diameter. , Lining the renovated pipe 3 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.

Tube Installation Process As shown in FIG. 2, while the lining process is being performed, one resin tube 10 is inserted from the pipe end 2 a of the existing pipe 2 over a predetermined length. Due to the diameter expansion of the rehabilitation pipe 3, the tube 10 is sandwiched and supported between the existing pipe 2 and the rehabilitation pipe 3. The tube 10 extends in the axial direction of the existing pipe 2 and is disposed between the top of the existing pipe 2 and the top of the regenerating pipe 3.

The tube 10 will be described with reference to FIGS.
As shown in FIG. 8, the tube 10 is provided with a portion extending from the tip to a predetermined length as the insertion portion 11, and the remaining portion is provided as the lead-out portion 12, and its total length is 70 cm, for example. As shown in FIG. 2, the insertion portion 11 of the tube 10 is inserted between the existing pipe 2 and the rehabilitating pipe 3 as described above, and the lead-out portion 12 is derived from the pipe end 2 a of the existing pipe 2. ing.

  As shown in FIG. 8, a plurality of, for example, four discharge units 13 are formed in the insertion unit 11 at equal intervals, for example, 10 cm in the axial direction. As shown in FIG. 9, a plurality of, for example, four discharge ports 13 a are formed in each discharge portion 13 at equal intervals in the circumferential direction.

  As shown in FIGS. 8 and 10, the distal end portion 14 of the tube 10 is closed by a crimp terminal 15 made of metal. That is, as shown in FIG. 11, the distal end portion 14 is closed by crushing in a state where the cylindrical crimp terminal 15 is put on the distal end portion 14 of the tube 10.

The tube 10 is inserted between the existing pipe 2 and the rehabilitating pipe 3 with the linear metal wire 18 (shown only in FIG. 9B) longer than the tube 10 being inserted over the entire length. . Due to the rigidity of the wire 18, the tube 10 can be accurately inserted in a state where it extends in the axial direction of the existing pipe 2 in a straight line. Further, the wire 18 can prevent the tube 10 from being crushed when the diameter of the regenerating pipe 3 is increased.
The tube 10 may be bonded to the outer periphery of the rehabilitation pipe 3 or the inner periphery of the existing pipe 2 in advance before the diameter expansion of the rehabilitation pipe 3.

  The following steps are preferably performed 24 hours or more after the end of the lining step. This is to avoid the influence of heat generated in the lining process.

The sealing process wire 18 is removed from the tube 10, and the rehabilitating tube 3 is cut leaving a predetermined length from the tube end 2a of the existing tube 2. 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.
In the water blocking material 20, a recess 21 is formed in the vicinity of and around the outlet 12 of the tube 10.

Adhesion Primer Injection Step Next, as shown in FIG. 4, an adhesion primer (surface treatment agent) is added to the region between the existing pipe 2 and the rehabilitating pipe 3 through the tube 10 and a predetermined length from the pipe end 2a. ,inject. The details will be described below.
A tank 40 provided with a foot-operated pump 30 is prepared. The pump 30 may be manually operated or may be motor driven.

The adhesive polymer is contained in the tank 40. The adhesive primer is preferably a solvent system which roughens the surface of the rehabilitating pipe 3 in order to increase the adhesive strength of the epoxy resin adhesive to the rehabilitating pipe 3 made of vinyl chloride resin. Further, those having the following characteristics are preferable.
Quick-drying: to reduce construction time.
Water resistance: Due to the high humidity in the sewer, there is also groundwater.
Low viscosity: The gap between the existing pipe 2 and the rehabilitating pipe 3 may be 1 mm or less, and it is required that the injection be performed at a low pressure and quickly at the time of injection.
In the present embodiment, “bond primer 80” manufactured by Konishi Co., Ltd. is used as the adhesion primer. The “bond primer 80” is a special synthetic resin as the main component and methyl ethyl ketone (ketone type) as the main solvent, and has the above-mentioned characteristics.

  The adhesive primer in the tank 40 is connected with the connection tube 31 by driving the pump 30 in a state where the connector 32 at the tip of the flexible connection tube 31 extending from the pump 30 is connected to the proximal end of the outlet 12 of the tube 10 It injects into the crevice between the existing pipe 2 and the rehabilitation pipe 3 through the tube 10. In this injection step, since the space between the pipe end 2a of the existing pipe 2 and the rehabilitating pipe 3 is sealed by the water blocking material 20 over the entire circumference, it is possible to prevent the adhesive primer from leaking out.

  In the process of passing the tube 10, the adhesion primer is discharged from the discharge ports 13a of the four discharge parts 13 axially spaced from the existing pipe 2 and the retreading pipe 3 at equal intervals in the axial direction, and flows downward. It spreads out. As a result, the adhesive primer can be evenly spread over the entire circumference of the gap from the pipe end 2a of the existing pipe 2 to a predetermined length, coating the outer peripheral surface of the rehabilitating pipe 3 and performing surface treatment.

Adhesive Injection Step Next, an adhesive is injected between the existing pipe 2 and the rehabilitating pipe 3 through the tube 10 over a predetermined length from the pipe end 2a. The details will be described below.
As the adhesive, a high-strength adhesive which is 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 this embodiment, “E2601” manufactured by Konishi Co., Ltd. is used as the low viscosity epoxy resin for crack injection.

  The main component of epoxy resin and the curing agent are measured and mixed in the tank 40, and the pump 30 is driven with no space between them, and the adhesive is applied via the connecting pipe 31 and the tube 10 in the same manner as the adhesive primer. The agent is injected from the pipe end 2 a of the existing pipe 2 into the gap between the existing pipe 2 and the rehabilitating pipe 3.

The adhesive is discharged from a plurality of discharge parts 13 of the tube 10 installed at the top of the pipe, and spreads almost uniformly over the entire circumference into a gap extending from the pipe end 2a of the existing pipe 2 to a predetermined length; The fact that the material 20 can prevent leakage to the outside is the same as in the case of the adhesive primer.
By cold hardening of the adhesive, the existing pipe 2 and the rehabilitating pipe 3 are bonded and fixed over a predetermined length from the pipe end 2 a of the existing pipe 2.

The finishing step Finally, as shown in FIG. 5, and cut to the tube 10 at the bottom of the recess 21 of the water stopping member 20, by filling an additional water stopping material 25 in the recess 21, the open end of the tube 10 Block the Thus, the rehabilitation of the existing pipe 2 is completed. Note that this finishing step may be omitted.

According to the rehabilitating method, the adhesive filled in the gap between the end of the existing pipe 2 and the end of the rehabilitating pipe 3 can play a role of water stop and adhesion.
First, the water stop function will be described. Since the adhesive is filled in the gap between the existing pipe 2 and the retreading pipe 3 substantially all the way around, the passage of the gap can be blocked. Therefore, it is possible to prevent the groundwater flowing into the gap from the crack of the existing pipe 2 and flowing along the rehabilitating pipe 3 from flowing into the manhole 1. 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 end of the existing pipe 2 and the end of the regenerating pipe 3 are adhesively fixed by the adhesive, the regenerating pipe 3 is restrained by the existing pipe 2 and the thermal expansion and the thermal contraction in the axial direction are performed. It is forbidden. Therefore, the breakage of the water blocking material 20 due to the expansion and contraction of the regenerating pipe 3 can be prevented.

  Since the adhesive primer is injected before the injection of the adhesive and the outer periphery of the rehabilitating pipe 3 is surface-treated, the adhesion strength between the adhesive and the rehabilitating pipe 3 can be remarkably enhanced, and the rehabilitating pipe 3 is more than expected When exposed to low temperature, even if a radial contraction load acts on the adhesive, it is reliably prevented that the peeling between the rehabilitating pipe 3 and the adhesive and the peeling between the rehabilitating pipe 3 and the existing pipe 2 occur. And can maintain the adhesive function over time.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention.
A plurality of tubes may be installed in parallel.
The adhesion primer and the adhesive may also be dispensed from the tip opening of the tube.
The adhesion primer and the adhesive may be injected without using a tube. That is, in the water blocking material for closing between the pipe end of the existing pipe and the rehabilitating pipe, an insertion hole which reaches the pipe end of the existing pipe and is continuous with the gap between the existing pipe and the rehabilitating pipe is formed The injection nozzle is inserted into the hole, and the adhesion primer and the adhesive are injected into the gap between the existing pipe and the rehabilitating pipe through the injection nozzle.
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 Reinforcement pipe 3a Projected end 10 Tube 11 Insertion part 12 Leading out part 13 Discharge part 13a Discharge port 14 Occlusion tip part 20 Water blocking material 25 Additional water blocking material

Claims (7)

Lining process of lining a resin-made rehabilitating pipe with the diameter expansion inside the existing pipe,
An adhesion primer injection step of injecting an adhesion primer from the end of the existing pipe into the gap between the existing pipe and the rehabilitated pipe after the lining step;
An adhesive injection step of injecting an adhesive from the end of the existing pipe into the gap between the existing pipe and the rehabilitating pipe after the adhesive preliner injection step;
The existing pipe restoration method characterized by having. Prepare a tube having an insertion part from the tip to a predetermined length and a lead-out part to be the remaining part,
In the lining step, in a state where the insertion portion of the tube is inserted from the end of the existing pipe in the axial direction of the existing pipe, the diameter of the retreading pipe is increased to expand the insertion portion to the existing pipe and the retreading Sandwiching with the pipe, the lead-out portion being led out from the end of the existing pipe,
The existing pipe rehabilitating method according to claim 1, wherein the adhesion primer and the adhesive are injected into the gap between the existing pipe and the rehabilitating pipe through the tube. Inserting the tube between the existing tube and the rejuvenation tube, with the linearly extending wire being inserted,
The existing pipe rehabilitating method according to claim 2, wherein the wire is extracted before the adhesive primer injection step.   The existing pipe reconditioning method according to claim 2 or 3, wherein the tube is disposed between the top of the existing pipe and the top of the regenerating pipe. The distal end portion of the insertion portion of the tube is closed, and a plurality of discharge portions are formed at intervals in the axial direction on the peripheral wall of the insertion portion. In each discharge portion, the discharge portions are circumferentially separated. A plurality of discharge ports are formed,
The said adhesion primer and the said adhesive agent are discharged from the said discharge port, The existing pipe rehabilitating method in any one of the Claims 2-4 characterized by the above-mentioned. After the lining step, before the adhesion primer injection step, the method further comprises a sealing step of sealing the entire end of the existing pipe with the rehabilitating pipe with a water blocking material,
The existing pipe rehabilitation method according to any one of claims 2 to 5, wherein the lead-out portion of the tube is led out of the water blocking material. The water blocking material has a recess in the vicinity of and around the outlet of the tube,
7. The existing pipe rehabilitating method according to claim 6, wherein after the adhesive injection step, the outlet portion of the tube is cut at the bottom of the recess and the recess is filled with an additional waterproof material.

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