JPH0942585A - Aseismic reinforcing device for life line conduit passage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join an elbow with a service tee more firmly, and surely prevent gas from leaking even when the elbow comes out of its junction point with the service tee. SOLUTION: When an aseismic reinforcing cover 50 is mounted to a joint point between a service tee 20 and an elbow 30, a semi-cylindrical parts 53 of a cover body 51 are hermetically fixed to the service tee 20, and concurrently, the elbow 30 is hermetically and slidably pressed with pressure by semi- cylindrical parts 56 so as to be fitted therein. By this constitution, when the underground is fluctuated to a great extent by earthquakes and the like, and even if the service tee 20 and the elbow 30 are subjected to intensive tension force relatively in the opposite directions so as to be out of their junction point, the elbow 30 will not come out of the aseismic reinforcing cover 50, it is rather closely pressed with pressure so as to be held therein, gas is thereby surely prevented from leaking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic strengthening device for lifeline pipelines such as gas pipes and water pipes, and in particular, it is seismic-resistant by covering the periphery of the joint between the service chi and the elbow with a seismic reinforcing cover. The present invention also relates to a seismic strengthening device for a lifeline pipeline that maintains airtightness and prevents gas leakage.

[0002]

2. Description of the Related Art Generally, lifeline pipelines for gas, water, etc., have conduits laid under the road leading to supply source facilities.
A large number of supply pipes are branched from the low-pressure main pipe at the end of this conduit to form a piping system for supplying gas, water, etc. to customers in each district.

FIG. 3 shows an example of a gas piping system, in which a threaded hole 21 of a main pipe 10 is screwed into a threaded portion 21 of a service chi 20 to be joined thereto. The threaded portion 23 of the connecting portion 22 projecting from the side portion of the service Q 20 has a threaded portion 31 on one end side of the L-shaped elbow 30.
Is screwed. Threaded part 3 on the other end side of the elbow 30
The threaded portion 41 of the supply pipe 40 is screwed into the connector 2.

Such a piping system employs a construction method in which a main pipe 10 is directly threaded and branched, and a service Q 20 is screwed to the main pipe 10 to form an elbow 30 suitable for the ground condition. By selecting and joining, even if an external force is applied due to the fluctuation of the ground and the supply pipe 40 is displaced, the displacement force is absorbed by the elbow 30 and the occurrence of buckling or the like of the joint portion is suppressed. Therefore, the threaded state of the supply pipe 40 with respect to the service che 20 via the elbow 30 is maintained well.

[0005]

However, there is a case where the supply pipe 40 is displaced by the external force due to the fluctuation of the ground by selecting and joining the elbow 30 suitable for the ground condition etc. to the service Q 20. However, although the displacement force is absorbed by the elbow 30 and the occurrence of buckling or the like at the joint is suppressed, an external force due to irregular and large vibration such as an earthquake is applied, and the supply pipe 4
If the displacement amount of 0 exceeds the absorption allowable range of the elbow 30, the joint between the service chee 20 and the elbow 30 may buckle, or the joint between the service chee 20 and the elbow 30 may come off, causing gas leakage. There was a problem that it would occur.

The present invention has been made in consideration of such a situation, and makes the joining of the elbow to the service chee stronger, and even when the joining of the service chee and the elbow is disengaged, The present invention relates to a seismic strengthening device for a lifeline pipeline that can reliably prevent the leakage of water.

[0007]

According to the first aspect of the present invention,
In a seismic strengthening device for a lifeline pipeline, in which a seismic reinforcement cover composed of a pair of half-divided covers covers the periphery of the joint between the service chi and the elbow to maintain seismic resistance and airtightness, the pair of covers The body has a first matching the outer shape of the service Qi and the elbow.
And a second semi-cylindrical portion is provided, and when the seismic retrofit cover is attached to the joint between the service che and the elbow,
The first semi-cylindrical portion of the pair of cover bodies is airtightly fixed to the service chee, and the second semi-cylindrical portion is slidably air-tightly press-fitted to the elbow. Characterize.

According to a second aspect of the present invention, the first and second aspects are provided.
A sealing material is interposed between the semi-cylindrical part and the service che and the elbow.

According to a third aspect of the present invention, the seismic reinforcement cover is formed of a flexible material.

[0010]

In the seismic strengthening device for a lifeline pipeline according to the present invention, when the seismic strengthening cover is attached to the joint between the service che and the elbow, the first half-cylindrical portion of the pair of cover bodies is attached to the service che. In addition to being airtightly fixed, the second semi-cylindrical part is airtightly press-fitted so that the elbow is slidable, so it can be serviced against external forces such as possible ground subsidence and swelling of the ground when the soil freezes. The joining force between the service chi and the elbow is increased by the press-fitting force of the second semi-cylindrical portion acting in addition to the joining force between the chi and the elbow, thereby increasing the joining force between the service chi and the elbow. Is further enhanced.

On the other hand, even when the underground changes greatly due to the occurrence of an earthquake or the like and strong pulling forces in opposite directions act on the service che and the elbow, the service che and the elbow are disconnected. The elbow is tightly crimped and held without coming off from the seismic reinforcement cover, and the airtightness of the joint between the service tee and the elbow is maintained.

At this time, the airtightness is further enhanced by the sealing material interposed between the first and second semi-cylindrical portions and the service che and the elbow.

Further, since the seismic resistant cover has flexibility, even if bending stress is applied to the service tee or the elbow in a direction other than the pipe axis direction, the bending stress is not applied to the bending stress. Deforms to some extent and maintains airtightness.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the drawings described below, the same parts as those in FIG. 3 are designated by the same reference numerals, and overlapping description will be omitted.

FIG. 1 and FIG. 2 show a seismic strengthening cover of a seismic strengthening device for a lifeline pipeline according to an embodiment of the present invention.

As shown in these figures, the earthquake-proof reinforcing cover 50 is a flexible molded body made of plastic or hard rubber and has two vertically divided cover bodies 51,
It is composed of 52.

Each of the cover bodies 51, 52 is provided with a semi-cylindrical semi-cylindrical portion 53 which is fitted to the outer shape of the service chee 20.
The circumference of 0 is covered. A flange 55 having a plurality of bolt holes 54 is provided at one end of each half-cylindrical portion 53. The flanges 55 are opposed to each other, and bolts (not shown) are provided in the respective bolt holes 54.
By mounting a fastening member such as a nut, each half-cylindrical portion 53 is fastened. In addition, each half cylinder part 5
A sealing material (not shown) may be interposed inside these half-cylindrical portions 53 when fitting 3 to the side surface of the service chi 20, and in this case, the airtightness of each half-cylindrical portion 53 is reduced. It is possible to further increase.

At the other end of each semi-cylindrical portion 53, there is provided a semi-cylindrical portion 56 that fits the outer shape of the connecting portion 22 projecting from the side of the service chi 20. Part 5
6 surrounds the connecting portion 22 and the elbow 30. A flange 58 having a plurality of bolt holes 57 is provided at the upper and lower ends of each half-cylindrical portion 56. The flanges 58 are opposed to each other, and a bolt-nut or the like (not shown) is fastened to each bolt hole 57. By mounting the members, the respective half cylinder portions 56 are fastened.

Further, when fastening the half-cylindrical portions 56, the sealing material 59 such as a rubber material provided inside the half-cylindrical portions 56 enhances the airtightness of the inside of each of the semi-cylindrical portions 56. It has become. Furthermore, these half cylinders 56
Has a slight gap between it and the elbow 30 because it is fitted to the outer shape of the connecting portion 22, but the half-cylindrical portion 56 and the elbow 30 are in an airtight state due to the interposition of the sealing material 59. The half-cylindrical portion 56 is attached to the elbow 30.
It is adapted to be crimp-fitted so as to be slidable inside.

Further, the dimension of the horizontal portion B of each semi-cylindrical portion 56 is set to a length sufficient to cover the maximum displacement amount of the elbow 30 when the connection with the service che 20 is disengaged due to the fluctuation of the ground. The elbow 30 does not come off from the inside of each semi-cylindrical portion 56 even if the joint with the service tee 20 is disengaged, and the elbow 30 is closely held by the sealing material 59 inside each semi-cylindrical portion 56. Further, since the seismic reinforcement cover 50 has flexibility, even if bending stress other than the pipe axis direction is applied to the service che 20 and the elbow 30, the seismic reinforcement cover 50 will not be affected. Deformation follows the bending stress to some extent, and airtightness is maintained.

The seismic retrofit cover having such a structure is mounted as follows. First, the peripheral portion of the elbow 30 screwed to the service chee 20 is exposed by excavation. Next, in order to enhance the airtightness of the service chee 20 and the elbow 30 by the seismic reinforcement cover 50, the skins of the service chee 20 and the elbow 30 are sufficiently cleaned.

After cleaning the surface of the pipe, each cover body 51,
The half-cylindrical portion 53 of 52 is fitted to the outer circumference of the service che 20, the respective half-cylindrical portions 56 are fitted to the outer circumferences of the connecting portion 22 and the elbow 30, and the respective flanges 55 and 58 are joined. At this time, the sealing material 5 is placed inside the half-cylindrical portion 56.
9 is attached.

After the fitting of the cover members 51 and 52 is completed,
Bolts are attached to the bolt holes 54 and 57 of the respective flanges 55 and 58, and tightened with nuts. When tightening with the nut, it is preferable that the bolt is tightened uniformly so that the bolt is not tightened one-sidedly, and thereby the airtightness inside the respective cover bodies 51 and 52 by the sealing material 59 is further enhanced.

Next, the operation of the seismic reinforcing cover having the above-mentioned structure will be described. First, even when the supply pipe 40 is displaced and a pulling force or the like acts on the elbow 30 due to ground subsidence or swelling of the ground due to freezing of the soil, etc., the screw connection of the elbow 30 to the service chi 20 does not cover the cover body. Since the pressure is increased by the pressure of the half-cylindrical portions 53 and 56 of 51 and 52, the joining state between the service chee 20 and the elbow 30 is more reliably maintained.

On the other hand, the underground changes greatly due to the occurrence of an earthquake or the like, and the opposite strong pulling forces act on the service chee 20 and the elbow 30 respectively.
Even if the joint between 0 and the elbow 30 is disengaged, the elbow 30 is tightly crimped and held without coming off from the seismic reinforcement cover 50, and the airtightness of the joint portion between the service chee 20 and the elbow 30 is maintained. It

That is, the dimension of the horizontal portion B of each semi-cylindrical portion 56 is set to a length sufficient to cover the maximum displacement amount of the elbow 30 when the connection with the service chi 20 is disengaged due to the fluctuation of the ground. The elbow 30 does not come off from the inside of each semi-cylindrical portion 56 even if the joint with the service tee 20 is disengaged, and the elbow 30 is closely held by the sealing material 59 inside each semi-cylindrical portion 56.

Moreover, since the seismic retrofit cover 50 is flexible, even if a bending stress other than the pipe axis direction is applied to the service tee 20 and the elbow 30, the seismic retrofit cover is provided. The element 50 is deformed by following the bending stress to some extent to maintain airtightness and prevent gas leakage.

As described above, in this embodiment, when the seismic resistant cover 50 is attached to the joint between the service chee 20 and the elbow 30, the half-cylindrical portions 53 of the cover bodies 51 and 52 are attached to the service chee 20. Since the semi-cylindrical portion 56 is airtightly fixed and the elbow 30 is slidably airtightly press-fitted to the elbow 30, the half-cylindrical portion 56 can be connected to the service qi 20 against external force due to assumed ground subsidence or rise of the ground when the soil freezes. In addition to the joining force of the joining portion with the elbow 30, the press fitting force of the half-cylindrical portion 56 acts to increase the joining force between the service chee 20 and the elbow 30, and the joining of the elbow 30 to the service chee 20 is made stronger. Done.

On the other hand, the underground changes greatly due to the occurrence of an earthquake or the like, and the opposite strong pulling forces act on the service chi 20 and the elbow 30, respectively.
Even if the joint between 0 and the elbow 30 is disengaged, the elbow 30 is tightly crimped and held without coming off from the seismic reinforcement cover 50, and the airtightness of the joint portion between the service chee 20 and the elbow 30 is maintained. Moreover, since the seismic reinforcement cover 50 is flexible, even if bending stress other than the pipe axis direction is applied to the service tee 20 or the elbow 30, the seismic reinforcement cover 50 will not be affected. Since it deforms following bending stress to some extent and maintains airtightness, gas leakage is reliably prevented.

In the above embodiment, the case where the earthquake-proof reinforcing cover 50 is applied to the gas piping system has been described, but the present invention is not limited to this example, and may be applied to other piping systems such as waterworks. In this case, it is possible to reliably prevent water leaks at branch points due to an earthquake or the like.

[0031]

As described above, according to the seismic retrofitting device for a lifeline pipeline of the present invention, it is possible to provide a service for external force due to assumed ground subsidence or rise of the ground when the soil freezes. The joining force between the service chi and the elbow is increased by the press-fitting force of the second semi-cylindrical portion acting in addition to the joining force between the chi and the elbow, thereby increasing the joining force between the service chi and the elbow. Since it is further increased, the elbow can be joined more firmly to the service che.

On the other hand, even if the underground changes greatly due to the occurrence of an earthquake or the like and strong pulling forces acting in opposite directions act on the service che and elbow, the service che and elbow are disconnected. The elbow is tightly crimped and held without coming off from the seismic reinforcement cover, and the airtightness of the joint between the service chi and the elbow is maintained, so even if the joint between the service chi and the elbow is disconnected,
It is possible to reliably prevent gas leakage.

[Brief description of drawings]

FIG. 1 is a perspective view showing a seismic strengthening cover of a seismic strengthening device for a lifeline pipeline according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a mounted state of the seismic reinforcement cover of FIG.

FIG. 3 is a perspective view showing an example of a conventional gas piping system.

[Explanation of symbols]

 10 Main pipe 20 Service Qi 30 Elbow 50 Seismic reinforcement cover 51,52 Cover body 53,56 Half cylinder part 59 Sealing material

Claims (3)

[Claims] 1. A seismic strengthening device for a lifeline pipeline, wherein a seismic strengthening cover composed of a pair of half-divided covers covers the periphery of a joint between a service chi and an elbow to maintain seismic resistance and airtightness. The pair of cover bodies are provided with first and second semi-cylindrical portions that match the outer shapes of the service che and the elbow, and the seismic reinforcement cover is attached to a joint portion of the service che and the elbow. Then, the first half-cylindrical portions of the pair of cover bodies are airtightly fixed to the service tee, and the second half-cylindrical portions are slidably and press-fitted to the elbows. A seismic strengthening device for lifeline pipelines. 2. The seismic resistance of the lifeline pipeline according to claim 1, wherein a sealing material is interposed between the first and second semi-cylindrical parts and the service che and the elbow. Reinforcement device. 3. The seismic reinforcement cover is formed of a flexible material.
Seismic strengthening device for the described lifeline pipeline.