JPH0519895B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for lining the inner surface of a sewer pipe buried underground by pasting a lining material thereon.

Sewerage usually collects sewage into a sewage tank, and the sewage tank has an inner diameter of about 250mm or more through an attached pipe with an inner diameter of about 150mm.
Connected to a 300mm branch pipe. Manholes are formed in the branch pipes in places, and the manholes are connected to the main pipe with a larger diameter. The sewage collected in the sewage basin flows into the branch pipe through the attached pipe, and then flows into the main pipe through the manhole and is collected at the treatment plant.

By the way, clay pipes, ceramic pipes, concrete pipes, etc. are usually used as sewer pipes. The components of sewage are not always constant and sometimes contain corrosive acids and alkalis, so it is difficult to use metal pipes, so corrosion-resistant pipes such as those mentioned above are used. be.

However, the joint part of these pipes fits the end of one pipe into a large diameter part formed at the end of the other pipe, so they tend to loosen and are susceptible to cracking or breaking due to external force. It's easy. Therefore, groundwater or rainwater may enter through loose or damaged joints, increasing the amount of sewage.

Originally, underground water and rainwater can be discharged as is without any problem, but once it gets mixed into sewage, it is impossible to separate it, and the amount of sewage that must be treated increases significantly. Therefore, large-scale sewage treatment equipment will be required.

Therefore, by preventing groundwater and rainwater from flowing into sewer pipes and collecting only a small amount of sewage that really needs to be treated at a treatment plant, all the necessary sewage can be treated with a small-scale sewage treatment facility. This makes it necessary to line the sewer pipes to prevent underground water from flowing into them.

Conventional technology The conventional method for lining underground pipelines is to insert a cylindrical flexible lining material coated with adhesive onto the inner surface into the pipeline while turning the inner and outer surfaces inside out using fluid pressure. However, a method is known in which the turned-over lining material is pressed against the inner surface of the pipe line using the fluid pressure and bonded via the adhesive. This method is usually applied to gas pipes, water pipes, etc.
Basically, it can also be applied to sewer pipes.

Problems to be Solved by the Invention However, when the above method is applied to sewer pipes, problems unique to sewer pipes arise. That is, in gas pipes and water pipes, the fluid flowing inside the pipe is under high pressure, and the lining material is expanded by the pressure and is always in pressure contact with the inner surface of the pipe. Therefore, in these pipes, there is almost no need to consider that the lining material will peel off from the inner surface of the pipe due to external pressure, and there is no need to consider that the internal fluid will leak outside from the damaged part. This is extremely effectively prevented by the material.

However, in the case of sewer pipes, there is no pressure inside the pipe, but on the contrary, external pressure is applied by external water such as groundwater or rainwater. Therefore, these external water flows in through joints and cracks in the pipeline and applies external pressure to the lining material, so the lining material must be able to withstand these external pressures.

In addition, as mentioned above, outside water constantly flows into sewer pipes through loose or cracked joints, and the inner surface of the pipe is always wet, so the lining material must be firmly bonded to the inner surface of the pipe. It is extremely difficult to do so. Moreover, as mentioned above, water flows in from the joints and cracks, so the water flows between the lining material and the pipe line along the weak bond between the pipe line and the lining material, peeling off the bond, and further This causes water to flow into the pipe from the edges of the lining material, such as the ends of the lining material and branch points, and it is not effective in preventing an increase in the amount of sewage due to the inflow of external water. The meaning of lining is lost.

The present invention has been made in view of the above circumstances, and is designed to withstand external water pressure caused by underground water, rainwater, etc. after lining the lining material, and even if the adhesion between the lining material and the tube furnace is not insufficient, underground water and rainwater The object of the present invention is to provide a lining method for obtaining a lining structure that prevents water from being mixed into wastewater.

Means for Solving the Problems Accordingly, the present invention forms elastic rings made of rubber-like elastic material on the inner circumferential surface of both ends of the sewer pipe and the inner circumferential surface of the sewer pipe at the branch part of the branch pipe, and A reaction-curing adhesive is applied to the inner surface of the lining material, which is made by forming a flexible airtight layer made of rubber or synthetic resin on the outer surface of a fibrous reinforcement such as woven or non-woven fabric, and the adhesive is applied to the fibers. The lining material is inserted into the sewer pipe while turning the inner and outer surfaces inside out under a fluid pressure higher than the water pressure outside the sewer pipe, and the turned lining material is inserted into the sewer pipe while maintaining the fluid pressure. This is characterized in that the adhesive is cured while being pressure-bonded to the inner surface.

The case where the method of the present invention is applied to a branch pipe of a sewer pipe will be described below. As shown in Figure 1, manholes 2 are formed in the branch pipe 1 every several tens to hundreds of meters, and the line between one manhole 2 and the next manhole 2 is lined in one work. . An attachment pipe 3 is attached to the branch pipe 1 at an appropriate location as required, and the attachment pipe 3 is connected to a wastewater basin 4. In the following explanation, the method will be explained as a method of lining the branch pipe 1, but it goes without saying that the method can be similarly applied to the attachment pipe 3 and the main pipe.

First, the inner circumferential surface of the end of the branch pipe 1, that is, the opening to the manhole 2, and if the attached pipe 3 branches from the branch pipe 1, the inner circumferential surface of the branch pipe 1 at the branching part of the attached pipe 3. An elastic ring 5 made of a rubber-like elastic body is formed on. As the material of the rubber-like elastic body constituting the elastic ring 5, easily compressible materials such as natural rubber, polyurethane, or soft polyvinyl chloride are used, and these materials are molded to form the elastic ring 5. It is appropriate to fit this into the inner peripheral surface of the branch pipe 1. The elastic ring 5 can also be formed by applying a two-component reaction-curing elastic resin liquid such as polyurethane to the inner peripheral surface of the branch pipe 1 and curing it. Furthermore, it is also possible to use a porous material such as a nonwoven fabric or sponge impregnated with an epoxy resin liquid.

It is also desirable to use, as these rubber-like elastic bodies, those containing a water-absorbing agent that absorbs water and swells. Suitable water absorbing agents include sodium polyacrylate, polyvinyl alcohol, or copolymers thereof.

After forming the elastic rings 5 on the inner circumferential surfaces of both ends of the branch pipe 1 and on the inner circumferential surface of the branch part of the attachment pipe 3, the lining material 6 is inserted into the branch pipe 1 while being turned inside out using fluid pressure. As shown in FIG. 2, the lining material 6 is made by forming a flexible airtight layer 8 made of rubber or synthetic resin on the outer surface of a fibrous reinforcing material 7 such as a cylindrical woven fabric or non-woven fabric, and the inner surface A reaction-curing adhesive is applied to the fibrous reinforcing body 7, and the fibrous reinforcement 7 is impregnated with the adhesive.

This lining material 6 is then inserted into the branch pipe 1 while turning the inner and outer surfaces inside out using fluid pressure. The tip of the lining material 6 is fixed in an annular manner within the manhole 2 at one end of the branch pipe 1, and fluid pressure is applied from a pressure vessel 10 to the rear part of the annular fixed portion 9. As a result, the lining material 6 is folded back so that the inner side becomes the outer side at the folded part 11 formed on the annular fixed part 9, and the folded part 11 advances along the branch pipe 1 from the one end to the other end. As a result, the lining material 6 is turned over over its entire length and inserted through the entire length of the branch pipe 1, and the lining material 6, whose inner and outer surfaces are turned inside out, is crimped onto the inner surface of the branch pipe 1 by the fluid pressure. .

The fluid pressure when turning over the lining material 6 needs to be higher than the pressure of water such as groundwater or rainwater outside the branch pipe 1. The size of the water pressure outside the branch pipe 1 can be calculated as 0.1 Kg/cm ² for 1 m depending on the depth from the ground where the branch pipe 1 is buried, and the fluid pressure is more than that. A slightly higher pressure is sufficient.

Further, it is desirable that the fluid pressure is sufficient to compress the elastic rings 5 formed at both ends of the branch pipe 1. The amount of pressure required to compress the elastic ring 5 cannot be unconditionally determined depending on the material of the rubber-like elastic body, but the amount of pressure required to compress the elastic ring 5 is such that about 5% of the thickness of the elastic ring 5 is compressed. Pressure is sufficient.

When the lining material 6 is turned over and inserted into the branch pipe 1, the fibrous reinforcing body 7 impregnated with adhesive is located on the outer surface and pressed against the inner surface of the branch pipe 1, and the airtight layer 8 is located on the inside thereof. The lining material 6 is pressed against the inner surface of the branch pipe 1 by fluid pressure, and elastic rings 5 are formed between the branch pipe 1 and the lining material 6 at both ends of the branch pipe 1.
, and the elastic ring 5 is compressed by the fluid pressure.

In this state, the lining material 6 is left to stand while maintaining the fluid pressure, or a heating fluid is passed through the lining material 6 to heat it, thereby causing the adhesive impregnated in the fibrous reinforcing body 7 to react and harden. With this, the lining material 6
is adhered to the inner surface of the branch pipe 1, and when the adhesive impregnated in the fibrous reinforcing body 7 hardens, the lining material 6 forms a rigid pipe.

Once the adhesive has completely hardened, the lining material 6 is cut at the opening to the manhole 2 at the end of the branch pipe 1. In addition, when the attachment pipe 3 is connected to the branch pipe 1, the lining material 6 of the connection part is perforated by appropriate means, and the attachment pipe 3 is connected to the branch pipe 1.
Let me understand.

Note that when forming the elastic ring 5 on the inner peripheral surface of the branch pipe 1, it is also possible to simply attach the elastic ring 5 to the inner peripheral surface of the branch pipe 1 and paste the lining material 6 on the inside thereof. A metal pressure expansion ring is fitted inside the ring 5, and the pressure is expanded to make the elastic ring 5.
It is also possible to pinch and compress the pressure between the pressure expansion ring and the inner surface of the branch pipe 1, and then affix the lining material 6 to the inside of the pressure expansion ring.

Function: In the method of the present invention, the lining material 6 is inserted into the branch pipe 1 while being turned over by fluid pressure.
The water that has flowed into the branch pipe 1 and accumulated therein is swept forward by the folded portion of the lining material 6, and no water is trapped between the branch pipe 1 and the lining material 6.
The lining material 6 is directly crimped onto the inner surface of the branch pipe 1. Furthermore, since fluid pressure higher than the water pressure outside the branch pipe 1 is acting inside the lining material 6 that has been turned inside out, the branch pipe 1
In joints and cracked areas, use lining material 6.
closes them and prevents external water from soaking into the inside of the branch pipe 1 in a state where the lining material 6 is crimped.

Since the adhesive is cured while applying fluid pressure to the inside of the turned-over lining material 6, external water will not enter inside the branch pipe 1 during this time. Rather, since the fluid pressure inside the lining material 6 is higher than the water pressure outside, the adhesive impregnated into the fibrous reinforcement 7 of the lining material 6 penetrates into the loose parts of the joints and cracks and hardens there. , acts to block these.

However, even with the lining material 6 adhered to the inner surface of the branch pipe 1 in this manner, it is difficult to completely prevent water from entering between the branch pipe 1 and the lining material 6 from the outside. That is, the lining material 6
Since the inner surface of the branch pipe 1 is wet when the lining material 6 is inserted through the branch pipe 1, the lining material 6 does not firmly adhere to the branch pipe 1, and the lining material 6 is constitutes a rigid pipe, and the pipe is fitted inside the branch pipe 1, and a slight gap is created between the branch pipe 1 and the lining material 6 at a portion where the adhesion is weak.

Further, the adhesive that has entered into loose joints or cracks does not completely fill these gaps, and it is inevitable that some water will enter the gap between the branch pipe 1 and the lining material 6. Furthermore, it is not possible to prevent water from entering through cracks that newly appear after lining.

Therefore, it is inevitable that water such as groundwater or rainwater outside the branch pipe 1 will enter between the branch pipe 1 and the lining material 6, and that water will damage the adhesive between the branch pipe 1 and the lining material 6. Diffusion through weak areas.

Here, in the present invention, the lining material 6 and the branch pipe 1
Since the elastic ring 5 is clamped and compressed between the pipe and the pipe, even if the lining material 6 is peeled off from the inner surface of the branch pipe 1 after lining is completed, the compressed elastic ring 5 will not recover. to fill in the gaps. Therefore, at the end of the lining material 6 and the branch part of the attached pipe 3, the space between the branch pipe 1 and the lining material 6 is completely sealed, and from the middle of the branch pipe 1, the branch pipe 1 and the lining material 6 are separated. Although the water that has flowed into the manhole 2 is diffused over the length of the branch pipe 1, it is blocked by the elastic ring 5 at its terminal and branch points, so it does not flow into the manhole 2 and mixes with the wastewater. That is not the case.

In addition, when the elastic ring 5 is clamped against the inner surface of the branch pipe 1 by the pressure expansion ring, the seal hardening of the elastic ring 5 does not reach the adhesive part between the lining material 6 and the pressure expansion ring, but the seal between the metal and the lining Since it is sufficiently adhered to the material 6 and will not peel off easily, water will not leak from here.

Further, as described above, by incorporating a water-absorbing agent that absorbs water and swells into the rubber-like elastic body constituting the elastic ring 5, the diffused water is absorbed into the elastic ring 5.
When touched, the elastic ring 5 absorbs water and swells to increase its volume and reliably fills the gap between the branch pipe 1 and the lining material 6, thereby more reliably preventing water from entering the sewage. .

Effects of the Invention According to the present invention, the lining material 6 is turned over and inserted into the branch pipe 1 with a fluid pressure higher than the water pressure of ground water, rainwater, etc. outside the branch pipe 1, so that the joint of the branch pipe 1 is not loosened or cracked. Even in a conduit where water is flowing in from a portion, the lining material 6 can be turned over while cutting off the water flowing in. Furthermore, since the adhesive is cured while maintaining the fluid pressure, the adhesive can be pushed into the gaps of loosened joints and cracks in the branch pipe 1, filling those gaps and greatly reducing the intrusion of water.

In addition, in the sewer pipe lined according to the present invention, the fibrous reinforcing body 7 of the lining material 6 is hardened with adhesive, and the lining material 6 constitutes a rigid pipe, so that the lining material 6 and the branch pipe Even if the lining material 6 is not firmly bonded to the branch pipe 1, the lining material 6 itself can sufficiently withstand external pressure, and the lining material 6 will not be crushed by the external water pressure of water entering from the branch pipe 1. Never.

Furthermore, groundwater, rainwater, etc. that have entered between the branch pipe 1 and the lining material 6 spread through the gap between the branch pipe 1 and the lining material 6;
The elastic ring 5 prevents this water from flowing into the manhole 2 and mixing with the wastewater, thereby preventing the amount of wastewater from increasing. Therefore, only what was originally collected as sewage is sent to the treatment plant,
Since only a small amount of sewage that really needs to be treated needs to be treated at the treatment plant, the equipment required for sewage treatment can be small-scale, and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a central longitudinal sectional view of a branch pipe of a sewer pipe lined according to the invention. FIG. 2 is a partially cutaway perspective view of the lining material used in the present invention. 1... Branch pipe, 5... Elastic ring, 6... Lining material, 7... Fibrous reinforcement, 8... Airtight layer.

Claims (1)

[Claims] 1. Elastic rings 5 made of rubber-like elastic material are formed on the inner circumferential surface of both ends of the sewer pipe 1 and on the inner circumferential surface of the sewer pipe 1 at the branch part of the branch pipe 3, and a cylindrical weave is formed. A reaction-curing adhesive is applied to the inner surface of the lining material 6, which is formed by forming a flexible airtight layer 8 made of rubber or synthetic resin on the outer surface of a fibrous reinforcing body 7 made of cloth or non-woven fabric. The lining material 6 is impregnated into the fibrous reinforcing body 7, and the lining material 6 is inserted into the sewer pipe 1 while turning the inner and outer surfaces inside out under a fluid pressure higher than the water pressure outside the sewer pipe 1, and the lining is turned inside out while maintaining the fluid pressure. A method for lining a sewer pipe, which comprises curing the adhesive while pressing the material 6 onto the inner surface of the sewer pipe 1. 2 The elastic ring 5 is a molded product made of an easily compressible material such as natural rubber, polyurethane, or soft polyvinyl chloride, and is attached to the inner circumferential surface of both ends of the sewer pipe 1 and the sewer at the branch part of the branch pipe 3. A method for lining a sewer pipe according to claim 1, which comprises fitting or abutting the inner peripheral surface of the pipe. 3 The elastic ring 5 is formed by applying a two-component reaction-curing elastic resin liquid such as polyurethane to the inner peripheral surface of both ends of the sewer pipe 1 and the inner peripheral surface of the sewer pipe 1 at the branch part of the branch pipe 3. A method for lining a sewer pipe according to claim 1, characterized in that the lining is formed by reaction hardening. 4. The method for lining a sewer pipe according to claim 1, wherein the rubber-like elastic body is a nonwoven fabric or sponge impregnated with an epoxy resin liquid. 5. The sewer pipe according to claim 1, 2, 3, or 4, wherein the rubber-like elastic body contains a water-absorbing agent that swells by absorbing water. Lining method. 6. The method for lining a sewer pipe according to claim 5, wherein the water absorbing agent is sodium polyacrylate, polyvinyl alcohol, or a copolymer thereof. 7 After forming the elastic ring 5 on the inner circumferential surface of the sewer pipe 1, a metal pressure expansion ring is fitted inside the elastic ring 5, and the pressure is expanded to make the elastic ring 5 on the inner surface of the sewer pipe 1. A method for lining a sewer pipe according to claim 1, characterized in that the lining is pressure-welded.