JP2000266266A - Mounting structure for branch pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure for a branch pipe which can surely mount a branch pipe tip end part in a prescribed position of a buried pipe opening and obtain sufficient adhesion. SOLUTION: A socket 13 for connection having a diameter a little smaller than an opening 12 of a buried pipe 10 having a flange 16 in the external periphery is mounted in a tip end of a branch pipe 11, a saddle member 17 having a saddle part 20 in a tip end of a cylindrical part 19 is fitted with a play to a tip end part of the socket 13 for connection, a brim part 21 provided in a base part of the saddle member 17 and the flange 16 are connected by a connecting implement 22 with a connection length adjustable, also a short pipe 18 with flange holding the brim part 21 between itself and the flange 16 in a movable condition is fitted in a tip end part of the socket 13 for connection.

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 distal end of the branch pipe, the outer diameter of the distal end portion is formed to be slightly smaller than the opening, and a connection socket having a flange on the outer periphery of the longitudinal middle portion is attached,
At the distal end of the connection socket, a saddle member having a saddle portion adhered to the outer surface of the buried pipe at the distal end of the tubular portion is loosely fitted,
A flange provided on the inner periphery of the base of the tubular portion of the saddle member and the flange are connected by a connection tool whose connection length is adjustable, and the flange is connected to the distal end of the connection socket by the flange. And a short pipe with a flange which is held movably between the short pipe and the second pipe.

[0006]

1 to 3 show an embodiment of a branch pipe mounting structure according to the present invention. FIG. 1 is a sectional view and FIG.
FIG. 3 is an exploded perspective view, and FIG. 3 is a sectional view of a connecting part. 4 to 6 are cross-sectional views for explaining a procedure for attaching a branch pipe. FIG. 4 shows a stage in which the propulsion steel pipe has been propelled and soil and sand from a branch pipe mounting portion have been removed, and FIG. FIG. 6 shows the step of drilling the peripheral wall of the buried pipe, and FIG. 6 shows the step of inserting the connection socket at the tip of the branch pipe into the drilled opening.
7 is a cross-sectional view showing a state where the branch pipe is eccentrically mounted, and FIG. 8 is a cross-sectional view of a connecting part at that time.

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 flange 16 provided on the outer periphery of the intermediate portion in the longitudinal direction.

A saddle member 17 for attaching the branch pipe 11 in a stable state is loosely fitted to a distal end portion of the connection socket 13 and a distal end side of the flange 16. Saddle member 1 on the tip side
A short pipe 18 with a flange for holding the pipe 7 is fitted.

The saddle member 17 has a conical cylindrical portion 19 having a diameter larger than that of the insertion tube portion 15 and an enlarged end, and a cylindrical portion 1 having a larger diameter.
9, a saddle portion 20 made of a curved plate provided at the tip of
Ring-shaped collar 21 provided on the inner periphery of the base of cylindrical portion 19
The flange 21 and the connection socket 1
3 and a flange 16 of the connecting device 2 having an adjustable connection length.
It is connected at four places by two.

The connecting member 22 is provided with a locking portion 24 at one end of a rod-shaped connecting member 23 having a concave-convex shape in the longitudinal direction. The connecting portion 22 is provided in a through hole 25 provided in the flange portion 21. While being inserted and locked, the bar-shaped connecting member 23 extending upward is inserted into a rubber bush 27 fitted into the through hole 26 of the flange 16. The rod-shaped connecting member 23 inserted into the rubber bush 27 is fixed with a predetermined engaging force by the concave-convex shape of the rod-shaped connecting member 23 and the elasticity of the rubber bush 27, and is engaged by applying a certain force. It is formed so that the position can be changed. That is, the angle of the saddle member 17 with respect to the connection socket 13 can be arbitrarily adjusted by arbitrarily setting the respective engagement positions of the four bar-shaped connection members 23 and the rubber bush 27. .

The flanged short pipe 18 has a retaining flange 29 having an outer diameter larger than the inner diameter of the flange 21 at the tip of a short pipe 28 having an inner diameter corresponding to the outer diameter of the insertion pipe 15. And the base end of the short tube portion 28 is connected to the connection socket 13 with the retaining flange 29 facing the front end.
Of the connection socket 13 in contact with the flange 16 of the
Is formed between the flange 16 and the retaining flange 29 so that the flange 21 of the saddle member 17 can be held in a movable state.

When the branch pipe 11 is attached to the buried pipe 10, the adhesive 30 is applied over the outer periphery of the distal end of the insertion pipe portion 15 and the distal end surface of the saddle portion 20.

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. 4, 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 in 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. 5, 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. 6, a connection socket 13, a saddle member 17, and a short pipe with a flange 18 are attached to the tip of the branch pipe 11 to be connected in a predetermined state.
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, the insertion tube 1
It is preferable that the tip of 5 is processed into a curved shape corresponding to the inner peripheral shape of the core 34 extracted.

Further, before the adhesive 30 is applied, the branch pipe 11 is inserted in a state where the members are assembled, and the distal end surface of the saddle portion 20 is pressed against the outer peripheral surface of the buried pipe 10 to connect the connection socket 1.
By adjusting the inclination angle of the saddle member 17 with respect to 3 and extracting the saddle member 17 as it is, the adhesive 30 is mounted and inserted again, so that the tip end surface of the saddle portion 20 is
It can be securely mounted in a state of being closely attached to the outer surface of the device.

When the branch pipe 11 is further inserted from the state shown in FIG. 6, 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. Thereby, 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 17 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. 7, even if the opening 12 is formed at a position eccentric with respect to the center of the buried pipe 10 due to a displacement of the propulsion steel pipe or the like, the opening 12 is formed at an angle.
By processing the tip of the insertion tube portion 15 in accordance with the shape of the core 34 and setting the tilting direction of the saddle member 17 as described above, the branch tube 11 is attached to the buried tube 10 in a predetermined joint state. Can be installed. In the case where the saddle member 17 is inclined and assembled as described above, as shown in FIG.
The upper portion of the rod-shaped connecting member 23 is engaged with the rubber bush 27, and the saddle member 17 is held.

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.

[0020]

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 an exploded perspective view.

FIG. 3 is a sectional view of a connecting part.

FIG. 4 is a cross-sectional view showing a stage in which the propulsion steel pipe has been propelled and soil and sand from a branch pipe mounting portion have been removed.

FIG. 5 is a cross-sectional view showing a stage in which a peripheral wall of a buried pipe is perforated.

FIG. 6 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. 7 is a cross-sectional view showing a state where the branch pipe is mounted eccentrically.

FIG. 8 is a sectional view of the connecting part in the state of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Buried pipe, 11 ... Branch pipe, 12 ... Opening, 13 ... Connection socket, 14 ... Receptacle, 15 ... Insertion pipe part, 16 ... Flange, 17 ... Saddle member, 18 ... Short pipe with flange, 19
... Cylindrical part, 20 ... Saddle part, 21 ... Flange part, 22 ... Connector, 23 ... Bar-shaped connecting member, 24 ... Locking part, 25, 26 ...
Through hole, 27 ... rubber bush, 28 ... short pipe part, 29 ... flange for retaining, 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. A connection socket having a flange formed on the outer periphery of the longitudinal middle portion is attached to the end of the connection socket, and a saddle member having a saddle portion bonded to the outer surface of the buried pipe at the tip of the tubular portion is attached to the tip of the connection socket. The saddle member is loosely fitted, and a flange provided on the inner periphery of the base of the cylindrical portion of the saddle member is connected to the flange with a connection tool whose connection length is adjustable. A branch pipe mounting structure, wherein a short pipe with a flange for holding a portion movably between the flange and the flange is fitted.