JPH0720669B2 - Lining method for pipelines with bifurcations - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of lining a pipeline having a branch pipe.

For gas pipes, water pipes, sewer pipes, pipelines laid for power lines and communication lines, etc., which are mainly buried in the ground, for the purpose of repairing or reinforcing dilapidated pipelines, It has been practiced to adhere a lining material to the lining to provide a lining.

As a lining method for this purpose, the flexible tubular lining material is inserted into the pipeline while turning it over with fluid pressure, and the lining material is pressure-bonded to the inner surface of the pipeline by the action of the fluid pressure,
A method of lining is known. In recent years, this method has attracted particular attention as a method particularly suitable for being applied to a conduit buried in the ground.

When the pipe lined in this way is lined in this way, if the pipe line has a branching part, the branching part is also lined up, so the branching part is blocked by the lining material. The branch pipe is shielded from the main pipe. Therefore, it is usually practiced to line the main pipe including the branch part and then to perforate the branch part blocked by the lining material in the lining material in a later process so that the branch part can be passed through to the main pipe. ing.

Problems to be Solved by the Invention However, when this pipeline is a sewer pipe, a big problem occurs.

Generally, sewer pipes do not receive internal pressure like gas pipes and water pipes, and the joint and branch structure are simple, so groundwater and rainwater that has penetrated into the ground easily flow into the sewer pipe. . Sewer pipes are used for intensive treatment of domestic wastewater, but when groundwater and rainwater flow in, the amount of sewage increases and the treatment equipment needs to be larger than necessary.

Essentially, groundwater and rainwater are pure and need no treatment. Therefore, it is desirable to prevent these inflows as much as possible and to concentrate only the sewage that really needs to be treated in the treatment equipment, and for that purpose, a sewage conduit is lined.

However, if the lining material is perforated at the branch as described above, it is impossible to prevent the inflow of groundwater or rainwater from the branch. In addition to the lining on the main pipe, the branch pipe is also lined in the same way to prevent the inflow of groundwater, etc. from the branch pipe. It cannot be lined inside the branch and cannot block the inflow of groundwater or rainwater from the branch.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a lining method capable of effectively blocking the inflow of groundwater or rainwater from a branch portion of a pipeline particularly in a sewer pipe. Is.

Means for Solving the Problems In the method of the present invention, a fitting member formed by forming a flange on one outer circumference of the short pipe is fitted to the branch portion of the conduit having the branch portion from the inside of the main pipe. In addition, a packing made of swelling rubber is interposed between the outer surface of the short pipe and the inner surface of the branch pipe of the fitting member and between the flange and the inner surface of the main pipe, and the tubular lining material is inserted into the main pipe. The inner lining material is adhered from the inside of the fitting member to the inner surface of the main pipe for lining, and then the lining material of the branch portion is perforated to pass the branch pipe through the main pipe. Is.

FIG. 1 shows an embodiment of the present invention, in which 1 is a main pipe and 2 is a branch pipe branched from the main pipe 1.

Reference numeral 3 is a fitting member fitted to the branch portion between the main pipe 1 and the branch pipe 2. The fitting member 3 is formed by forming a flange 5 projecting outward at one end of a short pipe 4 having an outer diameter matching the inner diameter of the branch pipe 2. Is fitted into the branch part by fitting the flange 5 to the inner surface of the main pipe 1 around the opening, and fitting the flange 5 to the opening part.

A packing 7 made of swelling rubber is provided between the inner surface of the branch pipe 2 and the outer surface of the short pipe 4 and between the flange 5 and the inner surface of the main pipe 1, respectively.

Reference numeral 6 is a flexible tubular lining material, and is preferably a tubular woven or non-woven fabric or other fibrous reinforcement having an airtight layer made of rubber or synthetic resin formed on the outer surface thereof. Then, a reaction-curable adhesive is applied to the inner surface of the lining material 6, and the adhesive is impregnated with the adhesive.

Then, while turning this lining material 6 over with fluid pressure, the main pipe 1
The lining material 6 which has been inserted and turned inside out is pressed against the inner surface of the main pipe 1 including the flange 5 of the fitting member 3 by the action of the fluid pressure, and adhered to the inner surface of the main pipe 1 via the adhesive. .

The method of lining the inner surface of the main pipe 1 with the lining material 6 is not limited to the above-mentioned method. For example, the tubular lining material 6 is pulled into the main pipe 1 and expanded by fluid pressure. However, it can also be lined by gluing it via an adhesive applied to the outer surface.

When the lining material 6 is turned over over its entire length and adhered to the inner surface of the main pipe 1, the lining material 6 that closes the branch portion between the branch pipe 2 and the main pipe 1 is perforated to make the branch pipe 2 inside the main pipe 1. Get to.

Example When the branch pipe 2 is lined, the branch pipe 2 is first lined, the tip of the branch pipe 2 is made to project into the main pipe 1, and the projecting portion is cut and then lined to the main pipe 1. At this time, the fitting member 3 may be fitted before being lined in the branch pipe 2, or may be fitted in the opening after being lined in the branch pipe 2 and the tip portion thereof is cut off. .

Further, after the main pipe 1 is lined, the branch pipe 2 is also lined, and the tip of the inside out is brought into contact with the lining material 6 lined in the main pipe 1, and the lining material of the branch pipe 2 and the main pipe 1 It is also possible to perforate the lining material 6 and the lining material 6 at once.

Further, the fitting member 3 may be one in which both ends of the short pipe 4 are open as shown in FIG. 1, but one in which the one end of the short pipe 4 is closed by the bottom portion 8 as shown in FIG. Can also be In this case, when piercing the lining material 6 at the branch portion, the bottom portion 8 of the fitting member 3 is also pierced so that the branch pipe 2 is passed through the main pipe 1.

Further, when using the fitting member 3 having the bottom portion 8 as described above, as shown in FIG. 3, first, as described above, the lining material 6 is inserted while being turned upside down by the fluid pressure, and is bonded with an adhesive. On the other hand, the branch pipe 2 is also inserted through the branch pipe 2 from the open end while being turned over by fluid pressure, and is adhered to the inner surface of the branch pipe 2 to be lined. The inside-out end of ′ is positioned inside the bottom portion 8 of the fitting member 3, and after that, the lining material 6 of the branch pipe, the fitting member 3
The bottom pipe 8 and the tip of the lining material 6 ′ are integrally perforated to allow the branch pipe 2 to pass through the main pipe 1 to form the main pipe 1.
Both the and the branch pipe 2 can be lined at once.

Action In the present invention, the fitting member 3 is fitted to the branch portion between the main pipe 1 and the branch pipe 2, and the fitting member 3 is the main pipe 1.
If it is lined with the lining material 6 lined on the inner wall of the branch pipe 2 and the branch pipe 2, the lining material 6 of the main pipe and the lining material 6 ′ of the branch pipe 2 hold the fitting member 3, the main pipe 1 and the branch pipe. Since the packing 7 made of swelling rubber is sealed between the two parts, the fitting member 3 can prevent groundwater and the like flowing from the branch part.

EFFECTS OF THE INVENTION Therefore, according to the present invention, not only the inflow of groundwater from the joints and damaged parts of the main pipe 1 but also the inflow from the branch part is effectively prevented, and the amount of sewage becomes unnecessary. It won't increase. Further, in the present invention, since the fitting member 3 is fitted through the packing 7 made of swelling rubber, the fitting member 3 has a high sealing property with respect to the main pipe 1 and the branch pipe 2, and when groundwater enters, the groundwater As a result, the packing 7 swells to increase the volume and the sealing effect can be further enhanced, so that the intrusion of groundwater can be completely prevented.

According to the example of FIG. 1, when the main pipe 1 is lined with the lining material 6, the adhesive enters the branch pipe 2 and stays thickly, which makes it difficult to punch the lining material 6 in a later step. By forming the bottom portion 8 on the fitting member 3 as shown in the embodiment of FIG. 2, the adhesive does not enter the branch pipe 2 and the perforation is facilitated.

The method of the present invention is particularly effective when applied to a sewer pipe, but is not limited to its application and can be widely applied to pipe lines having various other branched portions.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.
The drawing is a vertical cross-sectional view of a main portion showing the embodiment. FIG. 3 is a vertical cross-sectional view showing a state of implementation when the branch pipe is lined. 1 ... Main pipe, 2 ... Branch pipe 3 ... Fitting member, 4 ... Short pipe 5 ... Flange, 6,6 '... Lining material 7 ... Packing, 8 ... Bottom part

Claims (2)

[Claims] 1. A fitting member (3) formed by forming a flange (5) on the outer periphery of one end of a short pipe (4) at the branch of a pipe having a branch inside the main pipe (1). While mating from
A packing (7) made of swelling rubber is provided between the outer surface of the short pipe (4) and the inner surface of the branch pipe (2) of the fitting member (3) and between the flange (5) and the inner surface of the main pipe (1). While inserting the tubular lining material (6) into the main pipe (1),
The lining material (6) is adhered to the inner surface of the main pipe (1) from the inside of the fitting member (3) to lining it, and then the lining material (6) at the branching portion is perforated to branch pipe (2). ) Is introduced into the main pipe (1), the method for lining a pipeline having a branching portion. 2. The fitting member (3), wherein the one end of the short pipe (4) of the fitting member (3) is closed by a bottom portion (8), and an lining material (6) is inserted into the inner surface of the main pipe (1). After gluing, the branch liner (6) is perforated together with the bottom (8) of the fitting member (3), according to claim 1, characterized in that Lining method