JPH0519896B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for lining a sewer pipe buried underground by pasting a lining material on the inner surface thereof, and particularly relates to a method for lining the inner surface of a sewer pipe buried underground. It is related to pipes.

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 these branch pipes at various places, and the manholes are connected to a larger diameter main pipe. Then, the sewage collected in the sewage tank flows into the branch pipe through the attached pipe, and then flows into the main pipe through the manhole.
collected at a processing 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 joints of these pipes fit 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 easily damaged by cracking or breaking due to external force. It is something. 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. becomes possible. Therefore, in order to prevent underground water from flowing in, it is necessary to line the sewer pipe with a lining.

Conventional technology Conventionally, as a method for lining underground pipelines, a cylindrical flexible lining material coated with adhesive is placed inside the pipeline using fluid pressure while turning the inner and outer surfaces inside out. A method is known in which the lining material that has been inserted and turned inside out is pressed onto 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., but it is basically applicable to sewer pipes as well.

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 and rainwater. Therefore, these external water flows into the pipe through joints and cracks in the pipe 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 constantly leaking, so the lining material must be firmly bonded to the inner surface of the pipe. This is extremely difficult. Moreover, as described above, water flows in from the joints and cracks, and the water flows between the lining material and the pipe line along the weakly bonded areas between the pipe line and the lining material. In particular, in the branch pipe of the sewer pipe, the attachment pipe branches in the middle, and in order to pass the attachment pipe to the branch pipe at the branch point, a through hole is bored in the lining material. . Therefore, as mentioned above, the water that diffuses between the pipe and the lining material reaches the through hole at the branch part and flows into the branch pipe from there, increasing the amount of sewage. The purpose of lining the sewer pipes is lost, as it is not effective in preventing the increase.

The present invention has been developed in view of the above circumstances, and the lining material can withstand external water pressure due to groundwater, rainwater, etc. after lining, and even if the lining material and the pipe are not sufficiently bonded, groundwater and rainwater can be prevented. It is an object of the present invention to provide a lining method for obtaining a lining structure that does not mix with sewage.

Means for Solving the Problems The present invention provides an inner surface of a lining material in which a flexible airtight layer made of rubber or synthetic resin is formed on the outer surface of a flexible cylindrical fibrous reinforcing body such as woven or nonwoven fabric. , applying a reaction-curing adhesive to impregnate the fibrous reinforcing body with the adhesive, and inserting the lining material 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. , the method of lining the sewer pipe by adhering the lining material to the inner surface of the sewer pipe by curing the adhesive while maintaining the fluid pressure and pressing the turned-over lining material onto the inner surface of the sewer pipe; A process in which the pipe has a branch part, and a process of drilling several small holes from outside the sewer pipe around the branch part, and a process of pressurizing a water stop agent into the small holes from outside the sewer pipe. and a step of perforating the lining material of the branch portion.

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, there are manholes 2 in the branch pipe 1 every several tens to hundreds of meters.
is formed, and the area between one manhole 2 and the next manhole 2 is lined in one construction.
An attachment pipe 3 is branched from the branch pipe 1 and attached to the branch pipe 1 at an appropriate location as required, and the attachment pipe 3 is connected to a sewage basin 4. In the following description, 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 main pipe.

First, as shown in FIG. 2a, a plurality of small holes 5 are bored around the branch pipe 1 at the branching point with the attachment pipe 3, surrounding the attachment pipe 3, and as shown in FIG. 2b. Then, the small hole 5 is closed with a plug 6. The diameter of the small holes 5 is suitably about 10 mm, and an appropriate number of small holes 5 are bored at intervals of about several centimeters to more than ten centimeters.

Next, the lining material 7 is inserted into the branch pipe 1 while being turned over using fluid pressure. As shown in FIG. 3, the lining material 7 is made of a fibrous reinforcing material 8 such as a cylindrical woven fabric or non-woven fabric.
A flexible airtight layer 9 made of rubber or synthetic resin is formed on the outer surface of the material, and a reaction-curing adhesive is applied to the inner surface of the material. has been done.

Then, this lining material 7 is inserted into the branch pipe 1 while turning the inner and outer surfaces inside out using fluid pressure. The tip of the lining material 7 is fixed in an annular manner within the manhole 2 at one end of the branch pipe 1, as shown in FIG. As a result, the lining material 7 is folded back so that the inside becomes the outside at the folded part 12 formed on the annular fixed part 10, and the folded part 1
2 advances along the branch pipe 1 from the one end to the other end. As a result, the lining material 7 is turned over over its entire length and is inserted through the entire length of the branch pipe 1, and the lining material 7, 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 7 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.

When the lining material 7 is turned over and inserted into the branch pipe 1, the fibrous reinforcing body 8 impregnated with adhesive is placed on the outer surface and pressed against the inner surface of the branch pipe 1, and the airtight layer 9 is located on the inside thereof. The lining material 7 is pressed against the inner surface of the branch pipe 1 by fluid pressure. This situation is shown in FIG. 2c.

In this state, the plug 6 is removed while maintaining the fluid pressure within the lining material 7, and the water stopper 13 is press-fitted through the small hole 5. The water stop agent 13 is a resin that hardens by reacting with water, and a low-viscosity hydrophilic polyurethane resin stock solution is suitable. As this polyurethane resin, a polyurethane resin composed of an organic isocyanate polyether diol prepolymer or an organic isocyanate polyether triol prepolymer and toluene diisocyanate is particularly suitable. In this polyurethane resin, the prepolymer and water react to form urea bonds, and toluene diisocyanate acts as a crosslinking agent.
It hardens by generating carbon dioxide gas, forming an insoluble hydrogel with rubber-like elasticity.

When this water stop agent 13 is press-fitted with a pressure nozzle 14 at a pressure higher than the fluid pressure inside the lining material 7, the water stop agent 13 is inserted between the branch pipe 1 and the lining material 7 as shown in FIG. spread along.

Then, the adhesive impregnated into the fibrous reinforcing body 8 of the lining material 7 is reacted and cured by leaving it in this state or by heating it by passing a heating fluid into the lining material 7.
As a result, the lining material 7 is adhered to the inner surface of the branch pipe 1, and as the adhesive impregnated into the fibrous reinforcement 8 hardens, the lining material 7 forms a rigid pipe inside the branch pipe 1. Configure.

Once the adhesive has completely hardened, cut the lining material 7 at the opening to the manhole 2 at the end of the branch pipe 1, seal the end with an appropriate means, and connect the branch pipe 1 and the attachment pipe 3. A hole is made in the lining material 7 at the connection part of the pipe 1, and the attachment pipe 3 is passed through the branch pipe 1.

In the above explanation, the small hole 5 is bored in the branch pipe 1 before the lining material 7 is inserted into the branch pipe 1; The water stopper 1 may be drilled through the small hole 5.
The step of press-fitting 3 can also be performed after the adhesive has hardened.

Function: In the method of the present invention, the lining material 7 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 12 of the lining material 7, so that no water is trapped between the branch pipe 1 and the lining material 7, and the lining material The material 7 is directly crimped onto the inner surface of the branch pipe 1. In addition, a higher fluid pressure than the water pressure outside the branch pipe 1 is acting inside the inside-out lining material 7.
The lining material 7 closes joints and cracked portions of the branch pipe 1, and prevents external water from entering the inside of the branch pipe 1 when the lining material 7 is crimped.

Since the adhesive is cured while applying fluid pressure to the inside of the turned-over lining material 7, external water does not enter the inside of the branch pipe 1 during this time. Rather, since the fluid pressure inside the lining material 7 is higher than the water pressure outside, the adhesive impregnated into the fibrous reinforcement 8 of the lining material 7 penetrates into the loose parts of the joints and cracks and hardens there. , acts to block these.

However, even when the lining material 7 is adhered to the inner surface of the branch pipe 1 in this way, it is possible to completely prevent water from entering between the branch pipe 1 and the lining material 7 from the outside in the lined branch pipe 1. It is difficult to prevent it. In other words, since the inner surface of the branch pipe 1 leaks when the lining material 7 is inserted, the lining material 7 is not firmly attached to the branch pipe 1, and the adhesive impregnated in the fibrous reinforcing body 8 The lining material 7 forms a rigid pipe due to the agent, and the pipe is fitted inside the branch pipe 1, and the weakly bonded part between the branch pipe 1 and the lining material 7 peels off, leaving a slight gap. may occur.

Furthermore, the adhesive that has entered looseness or cracks in the joint 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 7. 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 7, and that water will damage the adhesive between the branch pipe 1 and the lining material 7. Diffusion through weak areas.

Here, in the present invention, the water stop agent 13
Since the water stop agent 13 is press-fitted, the water stop agent 13 spreads between the branch pipe 1 and the lining material 7 around the small hole 5, connects with each other, and spreads around the branch part as shown in FIG. surrounding it in a ring.

Therefore, as mentioned above, water can enter through loose joints or cracks in the branch pipe 1, causing damage to the branch pipe 1 and the lining material 7.
Although it is inevitable that the water diffuses through areas where the adhesive strength is weak, when this water reaches the area around the branch and comes into contact with the water sealant 13, the water sealant 13 reacts with the water and hardens. , constitutes an insoluble hydrogel having rubber-like elasticity. The gel body blocks water and prevents it from further diffusing and reaching the branch.

Therefore, at the branching point between the branch pipe 1 and the attachment pipe 3, the space between the branch pipe 1 and the lining material 7 is completely sealed, and the connection between the branch pipe 1 and the lining material 7 is made from the middle of the branch pipe 1. The water that flows in between the pipes diffuses over the length of the branch pipe 1, but is blocked by the hardened water sealing agent 13 at the branch part in the middle, and is blocked by the hole drilled in the lining material 7 of the branch part. There is no flow into the branch pipe 1, and groundwater or rainwater does not mix with the sewage.

Effects of the Invention According to the present invention, the lining material 7 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 7 can be turned inside out 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 reinforcement 8 of the lining material 7 is hardened with adhesive, and the lining material 7 itself constitutes a rigid pipe. Even if it is not firmly bonded to the branch pipe 1, the lining material 7 itself can sufficiently withstand external pressure, and the lining material 7 is crushed by the external water pressure of the water entering from the branch pipe 1. There is no such thing.

Furthermore, groundwater, rainwater, etc. that have entered between the branch pipe 1 and the lining material 7 will spread through the gap between the branch pipe 1 and the lining material 7, where the adhesion is weak; Since the gap between the branch pipe 1 and the lining material 7 is blocked by the water stop agent 13 at the branching point with the pipe 3,
This water flows into the branch pipe 1 and mixes with the wastewater,
It does not increase the amount of sewage. Therefore, only what was originally collected as sewage is sent to the treatment plant, and only the small amount of sewage that really needs to be treated needs to be treated at the treatment plant, so the equipment required for sewage treatment is small-scale. It can also save costs.

[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 central vertical sectional view of the main part showing the process of the present invention. FIG. 3 is a partially cutaway perspective view of the lining material used in the present invention. FIG. 4 is a plan view showing the diffusion state of the water stop agent press-fitted in the present invention. 1... Branch pipe, 5... Through hole, 6... Plug, 7... Lining material, 8... Fibrous reinforcement, 9... Airtight layer, 1
3...Water stop agent.

Claims (1)

[Scope of Claims] 1. A flexible airtight layer 9 made of rubber or synthetic resin is formed on the outer surface of a flexible cylindrical fibrous reinforcing material 8 such as woven or nonwoven fabric. A hardening adhesive is applied to impregnate the fibrous reinforcing body 8 with the adhesive, and the lining material 7 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. Then, while maintaining the fluid pressure and press-bonding the turned-over lining material 7 to the inner surface of the sewer pipe 1, the adhesive is cured, and the lining material 7 is adhered to the inner surface of the sewer pipe 1 to form a lining. In the method, the sewer pipe 1 has a branch part, and the sewer pipe 1 is arranged around the branch part.
A step of drilling several small holes 5 from the outside of the sewer pipe 1, a step of press-fitting the water stop agent 13 into the small holes 5 from outside the sewer pipe 1, and a step of drilling the lining material 7 of the branch part. A method of lining a sewer pipe having a branch part, the method comprising: 2. Claims characterized in that the water stopper 13 is a hydrophilic polyurethane resin stock solution consisting of an organic isocyanate polyether diol prepolymer or an organic isocyanate polyether triol prepolymer and toluene diisocyanate. A method for lining a sewer pipe having a branch portion as described in item 1.