JP2000329282A - Mounting structure of branch pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the mounting structure of a branch pipe to reliably mount the tip part of a branch pipe in the given position of a buried pipe opening and provide sufficient adhesion. SOLUTION: A socket 13 for connection having diameter smaller than that of the opening 12 of a buried pipe 10 and having a semispherical part 16 protruding from an outer periphery is mounted on the tip of a branch pipe 11. A saddle member 18 provided at the tip of a cylindrical part 19 with a saddle part 20 and provided with a spherical part 21 fitted in the semispherical part 16 at the tip part of the socket 13 for connection is loosely fitted in a base part and an engaging piece 17 situated at the spherical part 16 is engaged with an annular uneven surface part 22 formed on the spherical part 21 in a manner that a position is regulatable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe mounting structure, and more particularly to a branch pipe mounting structure for connecting a branch pipe to an existing pipeline buried underground.

[0002]

2. Description of the Related Art Existing pipelines (buried pipes) buried underground
As a method of connecting a new pipeline (branch pipe) to
A method described in, for example, JP-A-343998 is known. This method uses pipes (propulsion steel pipes) larger in diameter than branch pipes.
To the branch pipe joint of the buried pipe to a predetermined position near the buried pipe, after discharging the earth and sand in the propelled steel pipe, insert a forsaw into the propelled steel pipe and cut the peripheral wall of the buried pipe. An opening is formed by drilling, then the tip of the branch pipe is inserted and connected to this opening, and finally, the propulsion steel pipe is removed and earth and sand or mortar is injected into the outer periphery of the branch pipe and fixed. ing.

[0003]

However, in the above method, when an external force such as vibration during mortar injection is applied to the branch pipe,
The axis of the opening and the axis of the branch pipe tended to be out of alignment, and there was a risk that sufficient adhesion between the buried pipe and the branch pipe could not be obtained.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a branch pipe mounting structure in which the tip of a branch pipe can be securely mounted at a predetermined position of an opening of a buried pipe and sufficient adhesion can be obtained.

[0005]

In order to achieve the above object, a branch pipe mounting structure according to the present invention comprises a structure for mounting a branch pipe at an opening of a buried pipe drilled through a propulsion steel pipe reaching near the buried pipe. At the tip of the branch pipe, a connection socket whose outer diameter is slightly smaller than the opening is attached to the tip of the branch pipe. A saddle member having a saddle portion bonded to the outer surface is loosely fitted, a spherical portion is provided at the base of the tubular portion of the saddle member, and the spherical shape is fitted to the connecting socket from a longitudinally intermediate portion of the connection socket. Protruding hemisphere part
An engagement piece projecting from the hemispherical or spherical portion is engaged with a ring-shaped uneven portion provided on the peripheral surface of the spherical or hemispherical portion.

[0006]

1 and 2 show an embodiment of a branch pipe mounting structure according to the present invention. FIG. 1 is a sectional view showing a state in which a branch pipe is mounted on a buried pipe. Is a sectional view of a connection socket. 3 to 5 are cross-sectional views for explaining a procedure for attaching a branch pipe. FIG. 3 shows a stage in which the propulsion steel pipe is propelled and soil and sand from a branch pipe mounting portion are removed, and FIG. FIG. 5 shows the step of drilling the peripheral wall of the buried pipe, and FIG. 5 shows the step of inserting the connection socket at the tip of the branch pipe into the drilled opening. FIG. 6 is a sectional view showing a state in which the branch pipe is mounted eccentrically.

First, as shown in FIG. 1, the branch pipe 11 is attached to the buried pipe 10 by connecting the branch pipe 11 to the opening 12 drilled at a predetermined position on the peripheral wall of the buried pipe 10 by attaching it to the tip of the branch pipe 11. It is performed by inserting the tip of the socket 13 for use. The connection socket 13 includes a receiving port 14 into which the distal end of the branch pipe 11 is inserted, and an insertion pipe portion 1 having an inner diameter equal to the inner diameter of the branch pipe 11 and an outer diameter slightly smaller than the inner diameter of the opening 12.
5 and a hemispherical portion 16 protruding from the outer periphery of the intermediate portion in the longitudinal direction. A plurality of engaging pieces 17 are provided on the inner periphery of the distal end portion of the hemispherical portion 16 as shown in FIG. ing.

A saddle member 18 for attaching the branch pipe 11 in a stable state is provided on the outer periphery of the distal end portion of the connection socket 13. The saddle member 18 includes a tubular portion 19 having a larger diameter than the insertion tube portion 15, a saddle portion 20 formed of a curved plate provided at the tip of the tubular portion 19, and a tubular portion 1.
9 and a spherical portion 21 provided on a base portion of the base member 9, and a ring-shaped uneven portion 22 composed of a plurality of uneven portions is provided on the outer periphery of the spherical portion 21.

The hemispherical portion 16 and the spherical portion 21 are assembled in such a manner that the hemispherical portion 16 is fitted so as to cover the upper outer periphery of the spherical portion 21, and the spherical surfaces are in sliding contact with the connection socket 13 and the saddle. It is formed so that the connection direction with the member 18 can be adjusted to an arbitrary angle, and the engaging piece 17 of the hemispherical portion 16 is elastically engaged with the concave portion of the ring-shaped uneven portion 22 provided on the spherical portion 21. Thereby, the connection socket 13 and the saddle member 18 can be held at an arbitrary connection angle.

[0010] The engaging piece 17 may pass over the convex portion of the ring-shaped uneven portion 22 by elastic deformation of the hemispherical portion 16, and may move over the convex portion by elastic deformation of the engaging piece 17 itself. It may be. Further, the hemispherical portion 16 may be formed integrally with the connection socket 13, or a separately molded hemispherical member may be bonded or welded to the outer periphery of the connection socket. Further, the number of the engagement pieces 17 is optional.
Depending on the degree of elasticity of the engaging piece 17, the engaging piece 17 may be provided in a continuous state over the entire inner periphery of the hemispherical part 16, and an appropriate slit may be formed in the hemispherical part 16 of the engaging piece 17. Elasticity may be obtained.

Further, the positional relationship between the hemispherical portion 16 and the spherical portion 21 is reversed so that the spherical portion 21 covers the hemispherical portion 16,
A spherical portion 21 is formed on a ring-shaped uneven portion provided on the outer periphery of the hemisphere portion 16.
May be engaged with an engagement piece provided on the inner periphery of the.
Further, a ring-shaped uneven portion may be provided on the inner periphery of an object located on the outside, and an engaging portion may be provided on an object located on the inside.

When the branch pipe 11 is attached to the buried pipe 10, the adhesive 30 is applied over the outer circumference of the distal end of the insertion pipe section 15 and the distal end surface of the saddle section 20.
It is desirable to use an epoxy adhesive as the adhesive 30 in consideration of the curing time and the like. Further, the space between the socket 14 of the connection socket 13 and the tip of the branch pipe 11 may be fixed using an adhesive or the like in the same manner as in the case of ordinary pipe connection.

Next, a procedure for attaching the branch pipe 11 to the buried pipe 10 by the above-described attachment structure will be described. First, as shown in FIG. 3, the propulsion steel pipe 31 having a larger diameter than the branch pipe 11 is propelled to the vicinity of the buried pipe 10, and the sediment inside the propulsion steel pipe 31 and around the buried pipe 10 is discharged. Cement milk 32 is filled between the peripheral edge of the propulsion steel pipe 31 and the outer circumference of the buried pipe 10.

Next, as shown in FIG. 4, a forsaw 33 is inserted through the propulsion steel pipe 31, and the peripheral wall of the buried pipe 10 is pierced with a diameter slightly larger than the outer diameter of the insertion pipe part 15.
Form 2 At this time, the core 34 extracted by the forsaw 33 is extracted together with the forsaw 33.

Then, as shown in FIG. 5, a connection socket 13 is attached to the tip of the branch pipe 11 to be connected.
The spherical portion 21 of the saddle member 18 is fitted into the hemispherical portion 16, and the engagement piece 17 and the ring-shaped uneven portion 22 are engaged with each other, so that the saddle member 18 is mounted on the distal end side of the connection socket 13. Further, the branch pipe 11 is inserted into the propulsion steel pipe 31 while the adhesive 30 is provided at a predetermined position.
At this time, it is preferable that the distal end of the insertion tube portion 15 is processed into a curved shape corresponding to the inner peripheral shape of the extracted core 34.

Further, before the adhesive 30 is mounted, the members are assembled, and the branch pipe 11 is inserted with the engagement piece 17 engaged with the upper side of the ring-shaped uneven portion 22. Surface is pressed against the outer peripheral surface of the buried pipe 10 to form a ring-shaped uneven portion 2.
The inclination angle of the saddle member 18 with respect to the connection socket 13 can be adjusted by changing the engagement position of the engagement piece 17 with respect to the connection piece 2. By doing
The saddle portion 20 can be securely mounted in a state in which the distal end surface is in close contact with the outer surface of the buried pipe 10.

When the branch pipe 11 is further inserted from the state shown in FIG. 5, the distal end of the insertion pipe section 15 is inserted into the opening 12 of the embedded pipe 10, and the distal end surface of the saddle section 20 is placed on the outer periphery of the embedded pipe 10. It comes into contact with the surface. Thus, the outer periphery of the distal end of the insertion tube portion 15 of the connection socket 13 is fixed in the opening 12 via the adhesive 30, and the saddle portion 20 of the saddle member 18 is attached to the outer peripheral surface of the buried tube 10 via the adhesive 30 It is in a fixed state. When the adhesive 30 is sufficiently solidified, the cement milk is filled between the inner peripheral surface of the propulsion steel pipe 31 and the outer peripheral surface of the branch pipe 11, whereby the branch pipe 1 to the buried pipe 10 is filled.
1 is completed.

Further, as shown in FIG.
Even if the opening 12 is formed at a position eccentric with respect to the center of the buried pipe 10 due to a positional shift or the like, or is formed at an angle, the tip of the insertion pipe portion 15 is processed according to the shape of the core 34, As described above, the saddle member 18
By setting the assembling angle, the branch pipe 11 can be attached to the buried pipe 10 in a predetermined joint state. In the case where the saddle member 18 is inclined and assembled as described above, the engagement piece 17 engages with the base side of the ring-shaped uneven portion 22 at the lower part in the inclination direction, and engages at the upper part in the inclination direction. The mating piece 17 is engaged with the distal end side of the ring-shaped uneven portion 22, and the saddle member 18 is held in a predetermined posture.

[0019]

As described above, according to the branch pipe mounting structure of the present invention, the distal end of the branch pipe can be securely mounted at a predetermined position of the opening formed in the buried pipe.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a branch pipe mounting structure of the present invention.

FIG. 2 is a sectional view of a connection socket.

FIG. 3 is a cross-sectional view showing a stage in which earth and sand in a branch pipe attachment portion has been removed after the propulsion steel pipe has been propelled.

FIG. 4 is a cross-sectional view showing a stage in which a peripheral wall of a buried pipe is perforated.

FIG. 5 is a cross-sectional view showing a step of inserting a connection socket at the tip of a branch pipe into a perforated opening.

FIG. 6 is a cross-sectional view showing a state where the branch pipe is mounted eccentrically.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Buried pipe, 11 ... Branch pipe, 12 ... Opening, 13 ... Connection socket, 14 ... Socket, 15 ... Insertion pipe part, 16 ... Hemisphere part, 17 ... Engagement piece, 18 ... Saddle member, 19 ... Tube Shape,
Reference Signs List 20: Saddle part, 21: Spherical part, 22: Ring-shaped uneven part, 30: Adhesive, 31: Propulsion steel pipe, 32: Cement milk, 33: Horsaw, 34: Core

Claims (1)

[Claims] 1. A structure for attaching a branch pipe to an opening of a buried pipe drilled through a propulsion steel pipe reaching the vicinity of the buried pipe, wherein at the tip of the branch pipe, the outer diameter of the tip is slightly smaller than the opening. The socket for connection formed in is attached, and a saddle member having a saddle portion adhered to the outer surface of the buried pipe at the tip of the tubular portion is loosely fitted around the outer periphery of the distal end of the connection socket. A spherical portion was provided at the base of the cylindrical portion, and a hemispherical portion fitted to the spherical portion was protruded from a longitudinal middle portion of the connection socket, and provided on the peripheral surface of the spherical portion or the hemispherical portion. An attachment structure for a branch pipe, wherein an engagement piece protruding from a hemispherical portion or a spherical portion is engaged with the ring-shaped uneven portion.