JPH09209344A - Joint structure of buried pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly join together adjoining buried pipes without step difference or lateral dislocation by providing recessed joint parts spreading diameter toward the end parts inside both ends of a burried pipe, and using a projecting connecting ring contracting diameter toward the end parts outside both ends. SOLUTION: Recessed joint parts 1b tapered spreading diameter toward the end parts are provided inside both end parts of a hollow hole 1a of a buried pipe 1. A projecting joint parts 2a tapered contracting diameter toward the end parts is provided outside both end parts of a cylindrical projecting connecting ring 2 for connecting together the buried pipes 1. For installing the buried pipes 1, at first the extreme end of one projecting joint part 2a of the projecting connecting ring 2 is inserted into the recessed joint part 1b of the buried pipe 1, and then the recessed joint part 1b of the other buried pipe 1 is pressed against the other projecting joint part 2a of the projecting connecting ring 2 and engaged with this. The projecting joint part 2a of the projecting connecting ring 2 is centripetally slided in the direction of conforming the center axes to each other along the taper in the recessed joint part 1b of the buried pipe 1, and the adjoining buried pipes 1, 1 are correctly joint together without step difference or lateral dislocation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for an underground buried pipe that accommodates communication cables and the like.

[0002]

2. Description of the Related Art A conventional buried pipe joint structure is one in which a work for adjusting the position is performed during construction so that the buried pipes are installed and fixed so that there is no step or lateral shift between the two buried pipes. However, with such a structure, it is practically impossible to completely remove the step and the lateral deviation caused by the dimensional error and the construction error of the buried pipe. Then, the step or the lateral shift becomes an obstacle when laying the cable, and there is a possibility that the cable may be damaged by rubbing the jacket of the cable.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a joint structure for an embedded pipe, which eliminates a step or a lateral displacement caused by a dimensional error, a construction error, or the like of the embedded pipe and enables a smooth joint.

[0004]

Means for Solving the Problems Hereinafter, the description will be given with reference numerals in the accompanying drawings. In the joining structure according to the invention of claim 1, a hole 1a is provided, and an end is provided inside both ends of the hole 1a. Concave joint part 1b with a taper whose diameter expands toward the part
A recessed joint portion of the buried pipe 1; and a cylindrical convex connecting ring 2 provided with a convex joint portion 2a on the outside of both end portions, the convex joint portion 2a being tapered toward the end portion. 1
b and the convex joint portion 2a of the convex connecting ring 2 are engaged with each other.

In the joint structure according to the second aspect of the invention, the holes 3a are provided.
And a recessed joint portion 3b having a taper inside the end portion of the hole 3a, the diameter of which is expanded toward the end portion. It is composed of a cylindrical convex connecting ring 4 provided with a tapering joint portion 4a with a taper that becomes smaller and a retaining flange 4b at the other end, and is pulled out to the end opposite to the concave joint portion 3b of the buried pipe 3. The fixing flange 4b is fixed, and the concave joint portion 3b of the buried pipe 3 and the convex joint portion 4a of the convex connecting ring 4 are engaged with each other.

In the joint structure according to the third aspect of the invention, the holes 5a are formed.
A cylindrical convex connecting ring provided with an embedded pipe 5 provided with a ridge; and a convex joint 4a having a taper whose diameter decreases toward the end outside the end and a retaining flange 4b provided at the other end. 4; a cylindrical concave connecting ring 6 provided with a tapered concave joint portion 6a whose inner diameter increases toward the end and a retaining flange 6b at the other end, and the embedded pipe 5 The retaining flange 4a of the convex connecting ring 4 on the end of the
And the retaining flange 6b of the concave connecting ring 6 is fixed to the other end, so that the concave joint portion 6a of the concave connecting ring 6 and the convex connecting portion 4a of the convex connecting ring 4 are engaged.

In the joint structure according to the first aspect, when the buried pipe 1 is installed, the tip of the convex joint portion 2a of the convex joint ring 2 is inserted into the concave joint portion 1b of the buried pipe 1. When the new buried pipe 1 is pressed against the existing buried pipe 1, the convex joint portion 2a is centripetically slidably engaged in the concave joint portion 1b along the taper in the direction in which the central axes coincide.

In the joint structure of claim 2, the convex joint portion 4a of the convex connecting ring 4 and the concave joint portion 3a of the buried pipe 3 are centripetically slidably engaged in a direction in which the central axes coincide with each other along the taper. To do.

In the joint structure according to claim 3, the convex connecting ring 4 is provided.
The convex joint portion 4a and the concave joint portion 6a of the concave connection ring 6 are centripetically slidably engaged with each other in the direction in which the central axes coincide with each other along the taper.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the illustrated embodiment, it is possible to improve the water blocking effect by using an adhesive at the joint portion. Further, by selecting the material of the convex joint rings 2 and 4 and the concave joint ring 6, it is possible to increase the resistance to uneven settlement and lateral slip due to an earthquake or the like.

[0011]

As described above, in the joint structure according to the invention of claim 1, inside the both ends of the hole 1a of the buried pipe 1, the recessed joint portion 1b having a taper whose diameter expands toward the end is formed. Provided outside the both ends of the convex connecting ring 2 is a convex joint 2a having a taper whose diameter becomes smaller toward the end. The convex connecting portion 2a and the concave joint 1b are centripetally formed along the taper. Since they are slid to each other, the adjacent buried pipes 1 and 1 are accurately joined without any step or lateral displacement.

In the joint structure according to the second aspect of the present invention, the convex joint portion 4a of the convex connection ring 4 and the concave joint portion 3a of the buried pipe 3 have the same structure as the convex joint ring 4 of the present invention. The portion 4a and the concave joint portion 6a of the concave connection ring 6 have the same centripetal effect, and the adjacent buried pipes 1 and 1 are joined accurately to form a stepped portion that serves as a support for inserting and laying a cable or the like. It is not left on the inner surface of the holes.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a joint structure according to an embodiment of the invention of claim 1.

FIG. 2 is an enlarged view of a joint portion of the joint structure.

FIG. 4 is a front view of an embedded pipe having the joint structure.

FIG. 4 is a front view of a convex connecting ring of the joining structure.

FIG. 5 is a sectional view of a joint structure according to an embodiment of the invention of claim 2;

6 is an enlarged view of a joint portion of the joint structure of FIG.

FIG. 7 is a sectional view of a joint structure according to an embodiment of the invention of claim 3;

FIG. 8 is an enlarged view of a joint portion of the joint structure shown in FIG.

[Explanation of symbols]

 1 Buried pipe 2 Convex connecting ring 3 Cable pipe 4 Convex connecting ring 5 Buried pipe 6 Concave connecting ring

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[Procedure amendment]

[Submission date] April 18, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a joint structure according to an embodiment of the invention of claim 1.

FIG. 2 is an enlarged view of a joint portion of the joint structure.

FIG. 3 is a front view of an embedded pipe having the joint structure.

FIG. 4 is a front view of a convex connecting ring of the joining structure.

FIG. 5 is a sectional view of a joint structure according to an embodiment of the invention of claim 2;

6 is an enlarged view of a joint portion of the joint structure of FIG.

FIG. 7 is a sectional view of a joint structure according to an embodiment of the invention of claim 3;

FIG. 8 is an enlarged view of a joint portion of the joint structure shown in FIG.

[Explanation of symbols] 1 buried pipe 2 convex connection ring 3 cable pipe 4 convex connection ring 5 buried pipe 6 concave connection ring

Claims (3)

[Claims] 1. A buried pipe 1 provided with holes 1a, and inside of both ends of the holes 1a provided with a tapered concave joint portion 1b whose diameter expands toward the ends; and outsides of both ends. And a convex connecting ring 2 provided with a cylindrical convex joint 2a having a taper whose diameter decreases toward the end.
The joint structure of the buried pipe in which the concave joint portion 1b and the convex joint portion 2a of the convex connecting ring 2 are engaged with each other. 2. An embedded pipe 3 provided with a hole 3a, and a recessed portion 3b having a taper inside the end of the hole 3a and having a diameter expanding toward the end; and an outside of the end. The concave joint portion of the buried pipe 3 is composed of a cylindrical convex connecting ring 4 provided with a tapered joint portion 4a having a taper whose diameter decreases toward the end portion and a retaining flange 4b at the other end portion. A joint structure for a buried pipe in which a retaining flange 4b is fixed to the end opposite to 3b, and the concave joint portion 3b of the cable pipe 3 and the convex joint portion 4a of the convex connecting ring 4 engage with each other. 3. An embedded pipe 5 having a hole 5a; a convex joint portion 4a having a taper whose diameter decreases toward the end portion outside the end portion, and a retaining flange 4b at the other end portion. A cylindrical convex connecting ring 4 provided; a tapered concave connecting portion 6a whose inner diameter increases toward the end,
A cylindrical concave connecting ring 6 having a retaining flange 6b at the other end, and a convex connecting ring 4 at the end of the buried pipe 5.
Of the concave connecting ring 6 is fixed to the other end of the concave connecting ring 6.
The connection structure of the buried pipe in which the concave joint portion 6a of FIG. 4 and the convex connection portion 4a of the convex connection ring 4 engage with each other.