JPH09210270A - Joint for underground buried pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a follow-up relating to the ground displacement or the like and prevent generation of separation in a joint part and connect a plurality of underground buried pipes at a time. SOLUTION: In a joint, a plurality of underground buried pipes P and connection pipes P' movably held in a vertical direction are connected while impeding moving in a horizontal direction by respectively paired pipe pillows 11a. The joint is formed by a resin pipe 12 covering a connection part between the underground buried pipe P and the connection pipe P' in a holding condition and a sleeve pipe 15 externally fitting by the resin pipe 12 in order to hold a condition covering the connection part between the underground buried pipe P and the connection pipe P' in a holding condition. The resin pipe 12 is divided into two parts in a half split shape, its internal peripheral part is provided with a groove 12a storing a protrusion 13 protrusively provided in a pipe end part peripheral surface of the underground buried pipe P, groove 12b making the connection pipe P' slidable by a prescribed amount/while storing the protrusion 13 protrusively provided in a pipe end part peripheral surface of the connection pipe P', and storage grooves 12c, 12d of a rubber ring 14 for ensuring air-tightness and water stopping between the underground buried pipe P, connection pipe P' and the resin pipe 12.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pipe joint for mechanically joining underground buried pipes.

[0002]

2. Description of the Related Art In recent years, undergrounding of power lines and communication lines has been promoted, and the cable protection tube is required to have improved seismic resistance during earthquakes. Specifically, there is a demand for a pipe joint that has good followability to ground displacement during an earthquake and that has an expansion mechanism and a separation prevention mechanism that prevent disengagement at the joint.

However, the conventional underground pipe joint has a pair of half sleeves 1a and 1b as shown in FIG.
Then, the pipe end of the underground buried pipe P to be connected is covered in a hug shape, and these half sleeves 1a and 1b are fastened with bolts 2 and nuts 3, or as shown in FIG. The slip-out prevention ring 5 of the underground buried pipe P to be connected to the inner peripheral side is internally provided, and the notch-shaped projection 5a protruding on the inner peripheral surface of the slip-out prevention ring 5 is engaged with the outer circumference of the underground buried pipe P to be connected. It is common to include it. In addition, 6 in FIG. 6 is a rubber ring.

[0004]

However, none of the conventional pipe joints as shown in FIG. 5 and FIG. 6 has the expansion and contraction function and does not follow the ground displacement during an earthquake. In addition, the pipe joint shown in FIG. 5 does not have a separation prevention mechanism. However, in the pipe joint shown in FIG. 6, although the notch-shaped projection 5a is supposed to be engaged with the outer peripheral surface of the underground buried pipe P to exert a stopper function, the pipe joint can be operated at high speed like an earthquake. If it is pulled, it may have a certain effect, or it may be less reliable. In addition, these pipe joints are all connected one by one,
There is also a problem in terms of workability.

The present invention has been made in view of the above-mentioned problems of the prior art, and has an expansion mechanism and a separation prevention mechanism that have good followability to ground displacement during an earthquake and that do not separate at the joint. An object of the present invention is to provide a pipe joint for an underground buried pipe, which has a mechanism and can connect a plurality of underground buried pipes at one time.

[0006]

In order to achieve the above-mentioned object, the joint for underground buried pipe of the present invention is movable in one direction while being prevented from moving in one direction by a pair of pipe pillows. Which is a joint for connecting a plurality of underground buried pipes held to each other, and a resin pipe which covers the connection between the underground buried pipes in a hug shape, and a joint between the underground buried pipes is held by this resin pipe. It is formed with a sleeve pipe that fits over it in order to maintain the state of being covered in a circular shape, and the resin pipe is divided into two halves, and the pipe end of one underground buried pipe is in the inner peripheral part. A groove for accommodating a protrusion projecting on the outer peripheral surface of the other part, and a groove for accommodating the protrusion protruding on the outer peripheral surface of the pipe end of the other underground embedding pipe while allowing the other underground embedding pipe to slide by a predetermined amount. In addition, the airtightness and waterproofness between the above two underground buried pipes and the resin pipes are ensured. It is the is provided a receiving groove of the rubber ring for.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The underground burying pipe joint of the present invention has a plurality of underground burying pipes held movably in a direction perpendicular to the pipe tubs while being prevented from moving in one direction by a pair of pipe pillows. A joint for connection, in which a resin pipe that covers the connection portion between the underground buried pipes in a hug state and a state in which the connection portion between the underground buried pipes is covered in a hug state by this resin pipe It is formed with a sleeve tube that fits over. The resin pipe is divided into two halves, and the inner peripheral portion of the resin pipe accommodates a projection that is continuously or intermittently projected on the outer peripheral surface of one of the underground buried pipes. A groove and a groove for accommodating a protrusion protruding continuously or intermittently on the outer peripheral surface of the pipe end portion of the other underground buried pipe, while making the other underground buried pipe slidable by a predetermined amount, and A rubber ring storage groove is provided to ensure airtightness and water resistance between both underground pipes and resin pipes.

In the underground buried pipe joint of the present invention, a resin pipe that covers the connection between underground buried pipes in a hug manner is divided into two halves, and the pipe end of one of the underground buried pipes is divided into two halves. Since the groove is provided on the outer peripheral surface of the part for accommodating the projection that is continuously or intermittently provided, one underground buried pipe is fixed by being prevented from moving in the axial direction by the groove. Further, the inner peripheral portion of the resin pipe is provided with a groove for slidably accommodating a predetermined amount of a protrusion protruding continuously or intermittently from the outer peripheral surface of the pipe end portion of the other underground buried pipe. Therefore, the other underground buried pipe can be moved by a predetermined amount in the axial direction by the groove. Further, between the underground pipes and the resin pipe that are connected to each other, the airtightness and the water stop are secured by the rubber ring in the storage groove.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The underground buried pipe joint of the present invention will be described below with reference to an embodiment shown in FIGS. FIG. 1 is a vertical cross-sectional view of the underground buried pipe joint of the present invention before inserting the resin pipe into the sleeve pipe, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a bolt in the underground buried pipe joint of the present invention. 4 is a transverse sectional view of a resin pipe which is a constituent element of the underground buried pipe joint of the present invention.

1 to 4, 11a and 11b are tube pillows forming a pair, and one of the tube pillows 11a is provided with a space for inserting the underground buried pipe P to be connected, for example, four tubes. The horizontally arranged leg member 11aa is provided, and the other tube pillow 11b is provided with a fitting hole 11ba into which the leg member 11aa of the one tube pillow 11a is fitted.

Reference numeral 12 is a resin pipe which covers the pipe ends of an underground buried pipe (hereinafter referred to as a "connecting pipe") P'which is to be connected to the underground buried pipe P in a hug manner.
As shown in FIG. 4, it is formed in a half-divided shape which is divided into two in the longitudinal section direction, and the connecting portion of the underground buried pipe P and the connecting pipe P ′ is formed by the two-divided half-divided resin pipe 12. After covering, the fitting portion of the resin pipe 12 divided into two is joined with an adhesive.

By the way, in the underground buried pipe joint of the present invention, for example, round steel is welded to the outer peripheral surfaces of the underground buried pipe P and the connecting pipe P'to form the projections 13, respectively. Further, a rubber ring 14 is fitted between the connecting pipe P'and the resin pipe 12 covering the connecting pipe P'in a holding manner to ensure airtightness and water blocking.

On the other hand, on the inner peripheral portion of the resin pipe 12,
Grooves 12a, 12b for accommodating the respective protrusions 13
And storage grooves 12c and 12d for storing the rubber ring 14 are provided. Then, of the above-mentioned grooves 12a and 12b, for example, the protrusion 1 of the connecting pipe P ′ located on the right side of FIG.
The groove 12b for housing 3 is extended in the axial direction of the resin pipe 12 so that the connecting pipe P'can slide in the axial direction by the extended amount.

Numeral 15 is a sleeve pipe which is fitted onto the underground buried pipe P and the connecting pipe P'in order to hold the state in which the connecting portion of the underground buried pipe P and the connecting pipe P'is covered in a hug state by the resin pipe 12 as described above. The underground buried pipe joint of the present invention has the above-described structure. Next, a method for connecting the underground buried pipe P and the connecting pipe P ′ using the joint of the present invention having such a structure will be described.

First, each leg member 11a of one tube pillow 11a
Between a, as shown in FIG.
After passing 9 underground buried pipes P on the steps, the other pipe pillow 11b
The leg member 11aa is fitted into the fitting hole 11ba. As a result, the nine underground buried pipes P are held movably in the horizontal direction while being prevented from moving in the vertical direction.

The connecting pipes P'are connected to the pipe ends of the nine underground buried pipes P held movably in the horizontal direction while being prevented from moving in the vertical direction by the pair of pipe pillows 11a and 11b. In a state where the pipe ends of the above are relatively arranged, the pipe ends of the nine underground buried pipes P and the connecting pipes P ′ are covered with the resin pipe 12 which is divided into two, and the resin pipe 12 is divided into two. Join the mating parts with an adhesive. In addition, connection pipe P '
The sleeve tube 15 is externally fitted in advance.

Next, after inserting each leg member 11aa of the one tube pillow 11a into the connecting pipe P ', the leg member 11aa is fitted into the fitting hole 11ba of the other tube pillow 11b. And
The pair of pipe pillows 11a and 11b that horizontally hold the connecting pipe P ′ and the pair of pipe pillows 11a and 11b that horizontally hold the underground buried pipe P are shown in FIG.
Set the bolt 16 and tighten the nut 17 as shown in FIG. As a result, the sleeve tube 15 is replaced by the tube pillow 11a,
It is pushed by 11b and moves to the left in FIG.
Then, the fitting is completed and the assembly of the joint is completed.

In the underground buried pipe joint of the present invention thus constructed, the sliding amount of the joint portion is adjusted by the length of the groove 12b.
Further, the final proof stress of the joint portion is adjusted by the resin thickness and material of the grooves 12a and 12b and the storage grooves 12c and 12d. Although the sleeve pipe 15 is provided with a taper at one end of the resin pipe 12 in order to facilitate the external fitting of the sleeve pipe 15 to the resin pipe 12 in this embodiment, this taper is not essential. Further, in the present embodiment, the continuous projection 13 is formed by welding round steel, but the projection 13 may be intermittent, or other members may be used.

[0019]

As described above, in the underground buried pipe joint of the present invention, it is possible to connect a plurality of underground buried pipes at a time, and one of the underground buried pipes is axially moved by the groove. Is blocked and fixed, and the other underground pipe can be moved by a predetermined amount in the axial direction due to the groove, so it has good followability to ground displacement during an earthquake, and
No disengagement at the joint. Further, between the underground buried pipe and the resin pipe which are connected to each other, airtightness and water blocking are secured by the rubber ring in the storage groove.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an underground buried pipe joint of the present invention before a resin pipe is inserted into a sleeve pipe.

FIG. 2 is a side view of FIG.

FIG. 3 is a diagram for tightening bolts in the underground buried pipe joint of the present invention.

FIG. 4 is a cross-sectional view of a resin pipe which is a constituent element of the underground buried pipe joint of the present invention.

FIG. 5 shows a first example of a conventional underground pipe joint, (a) is a front view and (b) is a side view.

FIG. 6 is a vertical cross-sectional view showing a second example of a conventional underground buried pipe joint.

[Explanation of symbols]

 11a Pipe pillow 11b Pipe pillow 12 Resin pipe 12a Groove 12b Groove 12c Storage groove 12d Storage groove 13 Protrusion 14 Rubber ring 15 Sleeve pipe P Underground pipe P'Connection pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000001258 Kawasaki Steel Co., Ltd. 1-228 Kitahonmachi-dori, Chuo-ku, Kobe-shi, Hyogo Prefecture (72) Inventor Akira Matsuda 4--5 Kitahama, Chuo-ku, Osaka-shi, Osaka No. 33 Sumitomo Metal Industries, Ltd. (72) Inventor Kiyoshi Horiike 4-5-5 Kitahama, Chuo-ku, Osaka-shi, Osaka No. 33 Sumitomo Metal Industries, Ltd. (72) Inventor Shin-ichi Suzuki 2-6, Otemachi, Chiyoda-ku, Tokyo No. 3 within Nippon Steel Co., Ltd. (72) Inventor Masao Nakagawa 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside No. 3 Nippon Steel Co., Ltd. (72) Inventor Shigeru Nakagawa 1-chome Marunouchi, Chiyoda-ku, Tokyo No. 1-2 Nihon Steel Pipe Co., Ltd. (72) Inventor Tsuyoshi Ishizawa 2-3 2-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Works Tokyo Head Office

Claims (1)

[Claims] 1. A joint for connecting a plurality of underground buried pipes, which are movably held in a direction perpendicular to the pipe pillows, each of which is prevented from moving in one direction by a pair of pipe pillows.
With a resin pipe that covers the connection between the underground buried pipes in a hug shape, and a sleeve pipe that is fitted onto the resin pipe to hold the connection between the underground buried pipes in a hug shape. The resin pipe is divided into two halves, the inner peripheral portion of which has a groove for accommodating a projection protruding from the outer peripheral surface of the pipe end portion of one underground buried pipe and the other underground buried pipe. While accommodating the protrusion protruding from the outer peripheral surface of the pipe end, the other underground buried pipe is slidable by a predetermined amount, and the airtightness and water shutoff between the two underground buried pipes and the resin pipe are also provided. An underground buried pipe joint characterized by having a rubber ring storage groove for securing the same.