JP2656420B2 - How to join branch pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining branch pipes.

[0002]

2. Description of the Related Art Conventionally, when a branch pipe is later connected to a main pipe buried underground, an opening communicating with the branch pipe is provided in a peripheral wall of the main pipe at a branch pipe mounting portion, and the branch pipe is provided around the opening. Fixing the saddle with the receiving port of the saddle with an adhesive means, connecting a branch pipe to the receiving port of this saddle, or in the case of a pipe made of a material that is easily chemically bonded such as an FRP pipe, A branch pipe is directly inserted into the bored hole, and the periphery of the connection interface is mainly bonded from inside the main pipe with an adhesive or the like.

[0003]

[Problems of the prior art] However, the method using the former saddle in the above-mentioned connection method has a disadvantage that it requires digging a large area around the main pipe at the time of construction, which is disadvantageous in that the construction becomes large-scale, and rapid construction is required. There are disadvantages that cannot be done, and the latter method is used in places where groundwater pressure is high.
Leakage from the branch pipe attachment is likely to occur, and even if the leak is repaired, it is necessary to completely shut off the water inside the main pipe. There were drawbacks.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a method of joining branch pipes in which connection work is very easy and which can prevent a water leakage accident caused by a high groundwater pressure. It was made for the purpose of providing.

[0005]

That is, according to the method of joining branch pipes of the present invention, a through hole having an inner diameter through which a branch pipe can be inserted is formed in the peripheral wall of the main pipe, and a center hole having an inner diameter smaller than the outer diameter of the branch pipe is provided. A donut-shaped packing member having the following structure is adhered and fixed to the outer periphery of the main pipe concentrically with the through hole, and thereafter, the packing member is pushed out from the inside of the main pipe to insert the branch pipe, and the branch pipe end portion and the inner surface of the main pipe are inserted. Is bonded and sealed from the inside of the tube with a watertight member.

[0006]

Next, an embodiment of the present invention will be described. Figure 1
FIG. 3 is an explanatory view of the steps when the method of the present invention is carried out.

The method for joining branch pipes according to the present invention is, for example, an F
A through-hole 3 having an inner diameter through which the branch pipe 2 (FIG. 2 and below) can be inserted is formed in the peripheral wall of the main pipe 1 made of RP, and has a center hole 4A having an inner diameter d smaller than the outer diameter D of the branch pipe 2. The packing member 4 is adhesively fixed to the outer periphery of the main pipe 1 so as to be concentric with the through hole 3, and then, as shown in FIG. And joining the end portion 2A of the branch pipe 2 to the inner surface 1A of the main pipe 1 with a watertight member 5 from the inside of the main pipe 1.

In the above embodiment, the packing member 4 is formed of an elastic sheet, and an elastic member made of a material that can be bonded to the main pipe 1 and the branch pipe 2, for example, a sheet made of synthetic rubber or urethane resin is used. Is done. Further, in the above embodiment, when the branch pipe 2 is inserted through the center hole 4A of the donut-shaped packing member 4, it is desirable to apply an adhesive in advance to the contact surfaces of each other. By applying the adhesive, the adhesive functions as a lubricant at an uncured stage, facilitating insertion, and at the time of curing, the packing 4 is used.
Packing 4 and branch pipe 2 and main pipe 1
The gap between the outer circumference and the outer circumference is securely bonded.

[0009]

In the present invention, the donut-shaped packing 4 is adhered to the outer periphery of the main pipe 1 because the packing 4 is an elastic sheet. It can be glued out of the tube. In addition, since the inner diameter d of the center hole 4A is smaller than the outer diameter of the branch pipe 2, when the branch pipe 2 is inserted, the donut-shaped packing member 4 is effectively sealed around the pipe, and becomes tight against external groundwater pressure. Waterproofing is ensured.

[0010]

According to the present invention, as described above, the main pipe 1 is provided.
When the branch pipe 2 is connected to the main pipe 1, after the through-hole 3 is formed in the main pipe 1, the branch pipe connection operation can be performed by all operations from inside the pipe, and the connection between the branch pipe 2 and the main pipe 1 is possible. Since the part is wound around by the donut-shaped packing 4 from the outside, there is no water leakage even if the external water pressure is high, and there is almost no need to repair the water leakage later, and the branch pipe can be connected very quickly. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a process of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the steps of the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing the steps of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main pipe 2 ... Branch pipe 3 ... Through-hole 4 ... Donut-shaped packing member 4A ... Center hole 5 ... Watertight member

Claims (1)

(57) [Claims] 1. A donut-shaped packing member 4 having a central hole 4A having an inner diameter smaller than the outer diameter of the branch pipe 2 is formed in a peripheral wall of the main pipe 1 by forming a through hole 3 having an inner diameter through which the branch pipe 2 can be inserted. The sealing member 4 is adhered and fixed to the outer periphery of the main pipe 1 concentrically with the hole 3. Thereafter, the packing member 4 is pushed out from the inside of the main pipe 1 to insert the branch pipe 2, and the end of the branch pipe 2 is joined to the inner surface of the main pipe 1. A method for joining branch pipes, wherein a part is adhesively sealed from inside the pipe with a watertight member 5.