JPH0518480A - Branch pipe connecting method for buried pipe - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the upper part of the main pipe where the branch pipes are connected does not need to be excavated, the main pipes and the branch pipes connected to the main pipes are connected regardless of the wall thickness and the type of material. It is an object of the present invention to significantly improve the strength and sealing property of a portion and to provide a branch pipe connecting method in an embedded pipe body. To achieve the above object, a method for connecting a branch pipe in a buried pipe body according to the present invention is directed to a position of the main pipe connecting the branch pipes from the ground with a perforating device, and a sheath at the perforated hole. Inserting the pipe with the tip abutting against the main pipe, drilling a fitting fitting through hole in the main pipe where the sheath pipe abuts, and connecting the fitting fitting through the inside of the main pipe. The step of inserting the tubular portion of the tubular connector with a collar, in which the seal member is provided at the portion facing the inner peripheral surface of the main tube into the hole, and the tubular tube with the collar projecting from the through hole for fitting the connector into the sheath tube The step of connecting and sealing by fixing the tip of the branch pipe to the tubular portion of the tubular connector, and the step of filling the backfill material between the branch pipe and the sheath pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a branch pipe without excavation work above a main sewer pipe buried by a propulsion burying method.

[0002]

2. Description of the Related Art Conventionally, in order to connect a branch pipe (branch pipe) connected to each home to the main pipe, after excavating the surface of the portion connecting the branch pipes and connecting the branch pipes to the main pipe, The method of backfilling is generally used. However, in such a conventional construction method, wide excavation to the main pipe not only hinders traffic, but there is also a problem that there is much waste in terms of construction cost and construction period for repairing the excavated portion.

In order to solve such a problem, as shown in Japanese Unexamined Patent Publication No. 56-55241, a boring machine such as a boring machine is used to attach a drilling tool to the tip of the sheath pipe while rotating the drilling tool. After drilling the main pipe from the ground and then forming a through hole in the main pipe, a screw is engraved in this through hole, and the tip of the branch pipe is screwed into the screw portion to form the main pipe. It has been proposed to connect to.

[0004]

In the one described in the above publication, since the main pipe and the branch pipe are connected by screw fitting, for example, the meat of the main pipe or the branch pipe connected to the main pipe. When the thickness is thin, there are few screw fitting parts, and there are problems in strength, sealability, and the like. In particular, it appears remarkably when the material of the main pipe or the branch pipe connected to the main pipe is a relatively soft synthetic resin such as vinyl chloride.

The present invention has been proposed in view of the above problems, and the wall thickness of the main pipe and the branch pipes connected to the main pipe can be increased without excavating the upper portion of the main pipe at the portion connecting the branch pipes. It is an object of the present invention to be able to significantly improve the strength and sealing property of a connecting portion regardless of the type of material and to provide a branch pipe connecting method in a buried pipe body.

[0006]

In order to achieve the above object, a method for connecting a branch pipe in a buried pipe body according to the present invention is a boring device from the ground to a position of a main pipe connecting the branch pipe, Inserting the sheath tube into the bored hole with the tip abutting against the main tube, drilling a connecting fitting fitting through hole in the main tube where the sheath tube abuts, and the inside of the main tube From the step of inserting the tubular part of the tubular connector with a collar, in which the seal member is provided in the portion facing the inner peripheral surface of the main pipe, into the through hole for fitting the connector; From the step of connecting and sealing by fixing the tip end of the branch pipe to the tubular portion of the tubular connector with a collar protruding to the side, and the step of filling the backfill material between the branch pipe and the sheath pipe. It is characterized by being formed.

[0007]

First, a boring device such as a boring device is drilled from the ground toward the position of the main pipe where the branch pipe is connected,
After inserting the sheath tube into the bored hole such that the lower end portion of the sheath tube is in contact with the outer peripheral surface of the main tube, a connector fitting through hole is bored in the center of the sheath tube in contact with the main tube portion.

Next, from the inside of the main pipe, the tubular portion of the tubular connector with a collar, in which a seal member is provided at a portion facing the inner peripheral surface of the main pipe, is inserted into the connecting member fitting through hole, The tubular portion is projected inward of the sheath tube. Then, the lower end portion of the branch pipe inserted from above the sheath pipe is fitted and fixed to this tubular portion.
Then, by this fixing, the sealing member provided on the flange portion of the flanged tubular connector is more watertight between the flange portion of the flanged tubular connector and the inner peripheral surface portion of the main pipe around the connector fitting through hole. In addition to sealing, the flanged tubular connector is firmly supported by this flange, so that the mounting strength and the sealing performance of the branch portion are improved.

After that, when the backfill material is filled between the branch pipe and the sheath pipe, the work of connecting the branch pipe to the main pipe is completed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be described below with reference to the drawings.
FIG. 1 is a vertical sectional side view showing a state in which a branch pipe is connected to a main pipe, and reference numeral 1 in the drawing denotes a branch pipe connecting portion as a whole.
The branch pipe connecting portion 1 is configured to connect a drain pipe (branch pipe) 4 from each home to a large-diameter main pipe 3 for draining sewage, which is buried in the underground 2 which is relatively deep from the ground. is there.

The method of connecting the branch pipe 4 to the main pipe 3 is as follows. First, a hole is drilled from the ground toward the position of the main pipe 3 to which the branch pipe 4 is connected by a boring machine such as a boring machine (not shown). The sheath tube 6 is inserted into the perforated hole 5 in a state where the tip 6a of the sheath tube 6 is in contact with the outer peripheral surface 3a of the main tube 3. Then, a connector fitting through hole for penetrating a tubular portion 8 of a tubular connector 7 with a collar described later by a boring machine or a drilling device such as a drill in the outer peripheral surface portion of the main pipe 3 with which the sheath pipe 6 abuts. 9 is drilled. At this time, the diameter of the connector fitting through hole 9 is set to be slightly larger than the outer diameter of the tubular portion 8 of the tubular connector 7.

As shown in FIG. 2, the flanged tubular connector 7 has a collar portion 10 formed to have substantially the same curvature as the inner peripheral surface 3b of the main pipe 3, and a substantially central portion of the collar portion 10. A tubular portion 8 for connecting the branch pipe 4 is integrally formed in a protruding manner, and a rubber sheet (seal member) 11 for sealing is attached to an upper surface portion of the collar portion 10 facing the inner peripheral surface 3b of the main pipe 3. A fitting screw portion 12 is engraved on the tip of the tubular portion 8.

Next, the tubular connector 7 with a collar is housed in a substantially central portion of the mounting robot 13 whose inner movement of the main pipe 3 is controlled by remote control, and the tubular portion 8 of the tubular connector 7 with a collar is accommodated. The mounting robot 1 is moved until is concentric with the connector fitting through hole 9. The mounting robot 13 is provided with cameras 14 and 15 capable of photographing the inner peripheral surface 3b of the main pipe 3 through the distal end of the mounting robot 13 and the tubular portion 8 of the tubular connector 7 with a collar. An elevating device 16 for vertically moving the mounted tubular connector 7 with a collar is provided, and the tubular portion 8 of the tubular connector 7 with a collar is transparent for fitting the connector according to the images from the cameras 14 and 15. The movement of the mounting robot 13 is controlled so as to be concentric with the hole 9.

In this way, after the mounting robot 13 is moved until the tubular portion 8 of the tubular connector 7 with the collar is concentric with the through hole 9 for fitting the fitting, the tubular portion 8 is fitted for fitting the fitting. The elevating device 16 raises the flanged tubular connector 7 so as to project from the through hole 9 into the sheath tube 6. The branch pipe 4 is inserted from the upper end of the sheath pipe 6 while keeping the tubular portion 8 of the tubular connector 7 projecting from the connector fitting through hole 9 into the sheath pipe 6, and is formed at the lower end thereof. The female screw portion 18 that has been
When it is firmly screwed and fixed to the fitting screw portion 12 formed at the tip end of the connector, the connector fitting through hole is provided between the flange portion 10 of the flanged tubular connector 7 and the tip end of the branch pipe 4. The branch pipe 4 is firmly fixed and connected to the main pipe 3 in a state where the peripheral portion of 9 is sandwiched, and the rubber sheet 11 for sealing provided on the flange portion 10 is used for fitting the flange portion 10 and the connector. It is watertightly sealed with the peripheral portion of the through hole 9.

After that, when the backfill material 19 is filled between the branch pipe 4 and the sheath pipe 6, the work of connecting the branch pipe to the main pipe is completed. In the above-described embodiment, the tubular portion 8 of the tubular connector 7 with a collar projecting from the connector fitting through hole 9 into the sheath pipe 6.
The end portion of the branch pipe 4 and the end portion of the branch pipe 4 are fixed by screw fitting, but may be fixed by an adhesive 20 as shown in FIG. 5, or in addition to this, as shown in FIG. It goes without saying that the seal ring 21 can be interposed between the tubular portion 8 and the tip of the branch pipe 4.

Further, in the above embodiment, the through hole 9 for fitting the connector is provided.
The upper end of the sheath pipe 6 is pierced by a boring machine or a drilling device such as a drill. For example, as shown in Japanese Utility Model Laid-Open No. 61-122478, a mounting robot is equipped with a piercing device. Of course, when a hole for inserting a sheath tube is made, a small hole may be made at the same time in the central portion thereof, and the small hole may be used as a center for making a hole from the inside of the main tube with a punching device of a mounting robot. Is.

[0017]

As described above, according to the method for connecting a branch pipe in a buried pipe of the present invention, a hole is drilled from the ground toward the position of the main pipe connecting the branch pipe with a boring device such as a boring device. As a result, it is not necessary to excavate the upper part of the main pipe where the branch pipe is connected, and the part where the branch pipe is connected has a collar with a collar while shortening the construction period and reducing the construction cost. The sealing member provided on the flange of the tubular connector further seals the flange of the tubular connector with a collar and the inner peripheral surface of the main pipe around the connector fitting through hole in a watertight manner, and at the same time. ,
Since the tubular connector with a collar is securely supported by this collar portion, even if the material of the main pipe and the branch pipe connected to this is soft, it can be securely attached, and
There is an advantage that the sealing performance of the mounting portion can be greatly improved as compared with the screw-in type.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a state in which a branch pipe is connected to a main pipe by the method of the present invention.

FIG. 2 is a partially cutaway perspective view of a tubular connector with a collar.

FIG. 3 is a partially cutaway front view showing a state where a branch pipe is inserted in the vicinity of a tubular portion of a tubular connector with a collar.

FIG. 4 is a partially cutaway front view showing a state in which a branch pipe is connected to a main pipe.

FIG. 5 is a partially cutaway front view showing a state in which a branch pipe is connected to a tubular portion of a tubular connector with a collar by an adhesive.

FIG. 6 is a partially cutaway front view showing a state in which a seal ring is mounted between a tubular portion of a flanged tubular connector and a branch pipe.

[Explanation of symbols]

 3 ... Main pipe 3b ... Inner peripheral surface of 3 4 ... Branch pipe 5 ... Hole 6 ... Sheath pipe 7 ... Collared fitting 8 ... Cylindrical part 9 ...・ Connecting fitting fitting through hole 11 ・ ・ ・ Seal member 19 ・ ・ ・ Back filling material

Claims (1)

Claim: What is claimed is: 1. A piercing device is used to pierce a main pipe to which a branch pipe is connected from the ground, and a sheath pipe is inserted into the pierced hole in a state where a tip of the sheath pipe abuts against the main pipe. And the step of forming a fitting fitting through hole in the main pipe at the portion where the sheath pipe abuts, and the portion of the main pipe facing the inner peripheral surface of the fitting from the inside of the main pipe The step of inserting the tubular portion of the flanged connector provided with a seal member in the step of connecting the tubular portion of the flanged connector protruding into the sheath pipe from the connector fitting through hole A method of connecting a branch pipe in a buried pipe body, which comprises a step of performing a seal and a step of filling a backfill material between the branch pipe and the sheath pipe.