JP6956017B2 - Existing pipe rehabilitation method - Google Patents

Description

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

In sewers, etc., separated manholes are connected by sewer pipes buried underground. If this existing sewage pipe (hereinafter referred to as an existing pipe) deteriorates and cracks occur, inconveniences such as sewage leaking into the ground or groundwater invading occur. Therefore, the existing pipe is rehabilitated by lining the rehabilitated pipe inside the old pipe.

A method of lining an existing pipe having a relatively small diameter will be briefly described. A resin rehabilitation tube having a memory shape with a circular cross section is crushed into an omega cross section, passed through the existing tube, and heated steam is supplied to the rehabilitation tube to return it to a circular cross section and expand the diameter with compressed air to rehabilitate the tube. Line the pipe inside the existing pipe.

When the existing pipe is severely damaged, the rehabilitated pipe cannot completely follow the unevenness of the inner surface of the existing pipe, and a gap may occur between the rehabilitated pipe and the existing pipe. Therefore, the groundwater that has entered through the cracks in the existing pipe enters the gap, flows along the rehabilitation pipe, and flows into the manhole. In order to prevent the inflow of groundwater into the manhole, it is common to seal the space between the end of the existing pipe and the rehabilitation pipe with a water blocking material over the entire circumference.
However, since the rehabilitation pipe is continuously extended for a long time and the amount of expansion and contraction in the axial direction with a change in temperature is large, the water blocking material may be destroyed.

In FIG. 6 of Patent Document 1, after the rehabilitation pipe is lined on the existing pipe, a filler such as urethane or cement milk is applied between the rehabilitation pipe and the existing pipe through a hole formed in the peripheral wall at the end of the rehabilitation pipe. A method of injecting into a gap to block the passage of this gap is disclosed.
Paragraph 0003 of Patent Document 2 discloses the following water stopping method as a prior art. That is, a water blocking material impregnated with an epoxy resin on a glass mat is attached to the inside of the end of the existing pipe, and the water blocking material is applied to the rehabilitation pipe and the existing pipe by expanding the diameter of the rehabilitation pipe in the lining process. It is sandwiched between them, thereby blocking the passage of the gap between the rehabilitation pipe and the existing pipe.

Japanese Unexamined Patent Publication No. 2015-186898 Japanese Unexamined Patent Publication No. 2004-69053

In the methods of Patent Documents 1 and 2, since only the end portions of the existing pipe and the rehabilitation pipe are bonded, the load due to the axial expansion and contraction in the intermediate region of the rehabilitation pipe is concentrated on the bonded portions at both ends. As in the case of providing a water blocking material at the end of the existing pipe, the adhesive portion may be destroyed.

In order to solve the above problems, in the existing pipe rehabilitation method, the present invention includes a rehabilitation pipe insertion step of inserting a crushed resin rehabilitation pipe into the existing pipe, and axial expansion and contraction of the rehabilitation pipe with respect to the existing pipe. By inserting a long member containing a restraining material forbidden along the axial direction of the existing pipe and expanding the diameter of the rehabilitated pipe, the rehabilitated pipe is lined on the inner circumference of the existing pipe. In addition, it is characterized by including a lining step of pressing the long member with the existing pipe and the rehabilitation pipe.
According to the above method, since the long member including the restraint material is provided along the axial direction of the existing pipe, the load in the expansion and contraction direction of the rehabilitation pipe due to the temperature change can be dispersed and borne by the restraint material, and the rehabilitation pipe can be borne. It is possible to surely suppress or forbid the expansion and contraction of. As a result, for example, when a water blocking material is provided at or near the end of the existing pipe, its destruction can be prevented.

Preferably, the restraining material is made of an adhesive, the long member has an encapsulating bag for encapsulating the adhesive, and the long member is pressed by the existing pipe and the rehabilitation pipe in the lining step. At that time, the sealing bag bursts, and the adhesive is supplied to the gap between the existing pipe and the rehabilitation pipe.
According to the above method, since the adhesive is supplied to the gap between the existing pipe and the rehabilitation pipe, at least a part of the gap can be sealed, and the flow of water to the manhole through this gap is suppressed or blocked. can do.
Moreover, since the adhesive can be supplied by bursting the sealing bag containing the adhesive when the diameter of the rehabilitation pipe is expanded, the adhesive can be easily supplied to the gap between the existing pipe and the rehabilitation pipe.

Preferably, a plurality of the encapsulation bags are arranged side by side in the longitudinal direction of the 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 type adhesive, and each of the encapsulation bags has a first and second bag portions adjacent to each other in the width direction of the long member, and the first bag portion. The main agent of the adhesive is sealed in the bag, and the curing agent is sealed in the second bag portion. When the long member is pressed by the existing pipe and the rehabilitation pipe in the lining step, the first The bag portion and the second bag portion burst, and the main agent and the curing agent are mixed and supplied to the gap between the existing pipe and the rehabilitation pipe.
According to the above method, by using a two-component type adhesive, the curing time can be stabilized without being greatly affected by temperature.

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

In another aspect, the restraining material is made of an adhesive, the long member is made of a long sheet impregnated with the adhesive, and in the lining step, the long sheet is the existing pipe and the rehabilitation pipe. When pressed by, the adhesive is supplied to the gap between the existing pipe and the rehabilitation pipe.
According to the above method, by using the adhesive, the effect of suppressing the axial expansion and contraction of the rehabilitation pipe and the effect of stopping water can be obtained as in the case of using the long member having the sealing bag.

In still another aspect, the restraining material is made of a friction material, the long member is made of a long sheet formed of the friction material, and in the lining step, the long sheet is the existing pipe and the rehabilitation pipe. By being compressed with, the friction between the existing pipe and the rehabilitation pipe is increased.
According to the above method, the axial expansion and contraction of the rehabilitation tube can be suppressed by the long sheet made of the friction material.

Preferably, the rehabilitation tube is crushed into an Ω shape, and the long member is inserted into the recess.
According to the above method, the long member can be stably held until the middle of the diameter expansion process of the rehabilitation pipe.

Preferably, the long member is inserted over the entire length of the existing pipe.
According to the above method, the effect of restraining the rehabilitation pipe by the long member can be maximized.
Preferably, after the lining step, a sealing step is further provided in which the pipe end of the existing pipe and the rehabilitation pipe are sealed with a water blocking material over the entire circumference.

According to the present invention, it is possible to suppress or prohibit the axial expansion and contraction of the rehabilitation pipe with respect to the existing pipe by the restraining material of the long member extending in the axial direction of the existing pipe.

It is a vertical sectional view which shows the existing pipe rehabilitation method which concerns on 1st Embodiment of this invention in the order of a process, (A) is the state which inserted the rehabilitation pipe of the cross section Ω shape into the existing pipe, (B) was sealed with an adhesive. The state where the long member is inserted into the existing pipe, (C) is the state where the lining to the existing pipe is completed by expanding the diameter of the rehabilitation pipe, and (D) is the state where the sealing of the pipe end of the existing pipe is completed. show It is a cross-sectional view along the line II-II of FIG. 1 (B). FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1 (C). It is a top view which shows a part of the said long member. It is a top view which shows another example of a long member. It is a figure corresponding to FIG. 2 which shows the existing pipe rehabilitation method which concerns on 2nd Embodiment of this invention.

Hereinafter, the existing pipe rehabilitation 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 each other in the sewerage system, and an existing pipe 2 having both ends connected to the manholes 1 and deteriorated due to long-term use. The existing pipe 2 penetrates the peripheral wall 1a of the manhole 1. The pipe end 2a of the existing pipe 2 is located at a position substantially coincident with the inner circumference of the peripheral wall 1a. The lowest portion of the inner circumference of the pipe end 2a is located at substantially the same height as the upper surface of the bottom plate 1b of the manhole 1.

Hereinafter, the rehabilitation method of the existing pipe 2 will be described step by step.
Rehabilitation tube insertion step First, as shown in FIGS. 1A and 2, a long rehabilitation tube 3 crushed into an Ω cross section is pulled by a wire from one manhole 1 to the other manhole 1. Therefore, it is inserted over the entire length of the existing pipe 2. Both ends of the rehabilitation pipe 3 are projected from the pipe end 2a of the existing pipe 2. The rehabilitation tube 3 is made of a vinyl chloride resin having a shape memory function. The original cross-sectional shape of the rehabilitation tube 3 is circular, crushed flat, and further folded in half to form an Ω cross section.

Long member insertion step Next, as shown in FIGS. 1B and 2, the long member 10 in which the adhesive 15 (restraint material) is sealed is inserted over the entire length of the existing pipe 2. Here, the "total length" includes not only the case where the lengths of the long member 10 and the existing pipe 2 are equal but also the case where there is a difference of less than 10%.
As the adhesive 15, a high-strength adhesive having excellent water resistance and durability, low viscosity, and good wet adhesiveness is used. For example, epoxy resin, acrylic resin, polymer cement and the like are used. In this embodiment, a one-component type adhesive is used.

As shown in FIG. 4, the long member 10 has a plurality of encapsulation bags 11 arranged in the longitudinal direction by partitioning the long resin tubes at equal intervals in the longitudinal direction. In the present embodiment, partitions are formed every 1 m, and the width thereof is 80 mm and the height is 50 mm. Each encapsulation bag 11 is filled with the adhesive 15. The long member 10 is thin (1 mm or less) and can burst by an external force.

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

Lining step FIG. 1 (C), FIG. As shown in 3, the rehabilitation pipe 3 is lined inside the existing pipe 2. At this time, the diameter is over-expanded to increase the resistance between the rehabilitation pipe 3 and the existing pipe 2. As a result, the rehabilitation pipe 3 is less likely to shift in the horizontal direction. Further, even if the rehabilitation pipe 3 cools and tries to shrink, a portion having an overdiameter larger than that of the existing pipe 2 is caught at the pipe end, and it is difficult to shrink.

When the rehabilitation pipe 3 expands in diameter toward the existing pipe 2, the long member 10 is pressed between the rehabilitation pipe 3 and the existing pipe 2, the encapsulation bag 11 bursts, and the adhesive 15 is applied to the rehabilitation pipe 3. It is supplied to the gap between the existing pipe 2 and the existing pipe 2.
Since the long member 10 is inserted into the recess 3x of the rehabilitation pipe 3, it is stably held until the middle of the diameter expansion of the rehabilitation pipe 3.

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

According to the above rehabilitation method, the adhesive 15 supplied to the gap between the existing pipe 2 and the rehabilitation pipe 3 can play a role of stopping water and adhering due to the effect.
First, the water blocking function will be described. Since the adhesive 15 is filled in the gap between the existing pipe 2 and the rehabilitation pipe 3, at least a part of the passage in the gap can be blocked. Therefore, it is possible to prevent the groundwater that has entered the gap through the crack in the existing pipe 2 and has flowed along the rehabilitation pipe 3 from flowing into the manhole 1. In the present embodiment, since the water blocking material 20 is further formed at the pipe end of the existing pipe 2, water can be stopped more reliably.

Next, the adhesive function of the adhesive will be described. As described above, since the existing pipe 2 and the rehabilitation pipe 3 are adhesively fixed by the adhesive 15, the rehabilitation pipe 3 is restrained by the existing pipe 2 and axial thermal expansion and contraction are prohibited. Therefore, it is possible to prevent the water blocking material 20 from being broken or cracked due to the axial expansion and contraction of the rehabilitation pipe 3. Moreover, since the adhesive 15 is arranged over the entire length of the existing pipe 2, the expansion / contraction load in the axial direction of the rehabilitation pipe 3 can be dispersed and borne, and the expansion / contraction of the rehabilitation pipe 3 can be prevented more reliably.

When a two-component type adhesive is used, for example, when "E2601" manufactured by Konishi Co., Ltd. is used as the low-viscosity epoxy resin for crack injection, the long member 10'shown in FIG. 5 is used. In the long member 10', a thin resin tube is partitioned in the longitudinal direction at equal intervals to form a plurality of encapsulation bags 11', and the encapsulation bag 11'is formed in the width direction of the tube (existing pipe 2). By partitioning in the circumferential direction of), adjacent first and second bag portions 11a and 11b are formed. The first bag portion 11a is filled with the epoxy resin main agent 15a, and the second bag portion 11b is filled with the curing agent 15b.

The long member 10'is inserted into the recess 3x of the rehabilitation tube 3 having an Ω cross section in the same manner as the long member 10 of FIG. The long member 10'is pressed when the diameter of the rehabilitation pipe 3 is expanded, the bag portions 11a and 11b burst, and the main agent 15a and the curing agent 15b are mixed and supplied to the gap between the existing pipe 2 and the rehabilitation pipe 3. NS.
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. 6 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 is a recess of the rehabilitation pipe 3 over the entire length of the existing pipe 2. The long member 10 "which is inserted into 3x is pressed when the diameter of the rehabilitation pipe 3 is expanded, and the impregnated adhesive is supplied to the gap between the existing pipe 2 and the rehabilitation pipe 3.

The long member 10 "may be a long sheet made of rubber (friction material). The long member 10" is compressed by the expansion of the diameter of the rehabilitation pipe 3 and expands and contracts in the axial direction of the rehabilitation pipe 3 with respect to the existing pipe 2. It becomes the frictional resistance of.

The present invention is not limited to the above embodiment, and various modifications can be made as long as it does not contradict the gist thereof.
The sealed bags filled with the adhesive may be connected by a string or a thin-walled sheet.
The "diameter expansion" of the rehabilitation tube includes restoration to a circular cross section. For example, the case where the rehabilitation pipe is restored to a memorized circular cross section by swelling from the state of being crushed by high temperature steam, and the outer diameter of the restored rehabilitation pipe is equal to the inner diameter of the existing pipe is also included.
The existing pipe may be a cable protection pipe or the like as well as a sewer pipe.

The present invention can be applied to a method of rehabilitating an existing pipe such as a sewer.

1 Manhole 2 Existing pipe 2a Pipe end 3 Rehabilitation pipe 3a Protruding end 10, 10', 10 "Long member 11, 11' Encapsulation bag 11a First bag 11b Second bag 15 Adhesive 15a Main agent 15b Hardener 20 Water blocking material

Claims (5)

The rehabilitation pipe insertion process of inserting the crushed resin rehabilitation pipe into the existing pipe,
A long member insertion step of inserting a long member including a restraining material that prohibits expansion and contraction of the rehabilitation pipe in the axial direction with respect to the existing pipe along the axial direction of the existing pipe.
By expanding the diameter of the rehabilitation pipe, the rehabilitation pipe is lined on the inner circumference of the existing pipe, and the existing pipe and the rehabilitation pipe press the long member with the lining step.
With
When the restraining material is made of an adhesive, the long member has an encapsulating bag for encapsulating the adhesive, and the long member is pressed by the existing pipe and the rehabilitation pipe in the lining step, the above. An existing pipe rehabilitation method, wherein the sealing bag bursts and the adhesive is supplied to the gap between the existing pipe and the rehabilitation pipe. Existing pipe rehabilitation method according to claim 1, said encapsulating bag is characterized in that it is arranged more in the longitudinal direction of the elongated member. The adhesive is a two-component type adhesive, and each of the enclosed bags has first and second bag portions adjacent to each other 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 sealed, and the curing agent is sealed in the second bag portion.
When the long member is pressed by the existing pipe and the rehabilitation pipe in the lining step, the first bag portion and the second bag portion burst, and the main agent and the curing agent are mixed while being mixed. The method for rehabilitating an existing pipe according to claim 2 , wherein the pipe is supplied to a gap between the existing pipe and the rehabilitated pipe. The second or third claim, wherein the long member is made of a thin-walled tube, and the tubes are partitioned at intervals in the longitudinal direction to form the plurality of encapsulation bags. Existing pipe rehabilitation method. The rehabilitation pipe insertion process of inserting the crushed resin rehabilitation pipe into the existing pipe,
A long member insertion step of inserting a long member including a restraining material that prohibits expansion and contraction of the rehabilitation pipe in the axial direction with respect to the existing pipe along the axial direction of the existing pipe.
By expanding the diameter of the rehabilitation pipe, the rehabilitation pipe is lined on the inner circumference of the existing pipe, and the existing pipe and the rehabilitation pipe press the long member with the lining step.
With
The restraining material is made of an adhesive, and the long member is made of a long sheet impregnated with the adhesive.
An existing pipe rehabilitation method, characterized in that, when the long sheet is pressed between the existing pipe and the rehabilitation pipe in the lining step, the adhesive is supplied to the gap between the existing pipe and the rehabilitation pipe.

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