JPH0914569A - Earthquake resistant reinforcing device for life line pipe conduit - Google Patents

Abstract

PURPOSE: To provide an earthquake resistance reinforcing device whereby a pipe joint part particularly provided in an existing life line pipe conduit can be changed into a structure excellent in earthquake resistance. CONSTITUTION: A pipe joint part of a life line pipe conduit, connected by inserting a spigot 21 formed in an end of a pipe 2 into a socket 11 formed in an end of a pipe 1, has a split type earthquake resistant reinforcing cover 8 surrounding the periphery total unit of the pipe joint astride mutually between the socket 11 and the spigot 21 fitted to each other, and this cover 8 is formed by air-tightly and fixedly connecting one end side in a pipe axial direction to a peripheral surface of the socket also by air-tightly and slidably fitting the other end side relating to a peripheral surface of the spigot.

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. More specifically, the joint portion of an existing lifeline pipeline connected through a pipe joint is The present invention relates to a seismic strengthening device for a lifeline pipeline, which is designed so as not to break out and be damaged during an earthquake.

[0002]

2. Description of the Related Art Lifeline pipelines for gas, water, etc. are generally constructed by laying a conduit line leading to a supply source facility under the road and branching off a large number of supply pipes from a low-pressure main pipe at the end of the conduit line. It is a piping system that supplies gas, water, etc. to customers in each district.

The above-mentioned conduit (low-pressure main pipe) usually has a structure in which cast iron pipes of a required length are connected by a pipe joint, and the pipe joint is generally of the insertion type shown in FIG. Pipe fittings are widely used.

This type of pipe joint has a receiving port 11 at the pipe end of one of the pipes 1 forming a lifeline pipe, as shown in FIG.
And the pipe end of the other side of the pipe 2 on the other side is an insertion port 21 for the straight, and the insertion port 21 is inserted into the receiving port 11 to connect the mating parts of the two to the hemp skin 3. The lead 4 and the rubber ring 5 are fitted to secure the sealing property. In the illustrated example, a flange 11a is provided at the end of the socket 11,
The push wheel 6 arranged so as to oppose to this is fastened to the flange 11a of the receiving port 11 with the bolt 7 to prevent the seal member (the hemp skin 3, the lead 4, the rubber wheel 5) from coming off. It should be noted that the pipe joint shown in FIG. 1 is an example of a plug-in type conventional example, and a pipe joint called a water supply type joint or a seal wax type joint which is not provided with a push ring 6 is also widely known. Has been.

[0005]

By the way, the lifeline pipelines connected by the above-mentioned pipe joints are subjected to irregular seismic motions applied to the pipes 1 and 2 when a large earthquake is received. When the two are movable and the earthquake motion is large such as the Great Hanshin Earthquake, the movable amount exceeds the maximum elongation x shown in Fig. 1 and the connection of the pipe joint part comes out, and the pipe line is damaged. .

In order to solve the above-mentioned problems, conventionally, the fitting dimension between the receiving port 11 and the insertion port 21 is increased to increase the maximum extension amount x, and a retaining structure for the insertion port 21 is added. Seismic resistant pipe joints with enhanced seismic function are available, for example
No. 8-25194, Japanese Patent Publication No. 62-4592, and the like. However, even if such a seismic resistant pipe joint can be applied when newly installing a pipeline, if it is applied to an existing pipeline, the entire pipe joint must be replaced and replaced. There is also a problem in that the replacement work requires a great deal of expense, and that the use of the pipeline must be stopped during the work, resulting in great inconvenience to the customer.

In view of the above problems, it is an object of the present invention to provide a seismic strengthening device which can convert a pipe joint portion provided in an existing lifeline pipeline into a structure having excellent seismic resistance.

[0008]

In order to achieve this object, the invention of claim 1 according to the present invention is such that a pipe end insertion port of another pipe is inserted into a receiving port formed in the pipe end of one pipe. In a pipe joint portion of a lifeline pipeline that is airtightly connected, a split-type seismic reinforcement cover that surrounds the entire outer periphery of the pipe joint portion across the receiving and insertion ports that are fitted to each other, The cover is characterized in that one end side in the pipe axis direction is airtightly joined and fixed to the outer peripheral surface of the receiving opening, and the other end side is slidably fitted to the outer peripheral surface of the insertion opening. And

According to a second aspect of the present invention, a pipe joint of a lifeline pipe line in which a pipe end insertion port of the other pipe is inserted into a receiving port formed at the pipe end of the one pipe to make an airtight connection. In the section, there is provided a split-type seismic reinforcement cover that surrounds the entire outer periphery of the pipe joint portion across the receiving port and the insertion port that are fitted to each other, and the cover has one end side in the pipe axis direction described above. It is characterized in that it is airtightly joined and fixed to the outer peripheral surface on the insertion opening side, and the other end side is airtightly fitted slidably on the outer peripheral surface on the receiving opening side.

Further, the split type seismic reinforcement cover is formed of a flexible material.

[0011]

According to the seismic strengthening device having the above structure, since the seismic strengthening cover is a split type and is installed so as to surround the outer circumference of the existing pipe joint, the existing lifeline pipe in the connected state is connected. It can be easily applied to roads.

With the seismic reinforcement cover attached,
Since one side of the receiving port and the insertion port that are fitted together is slidable with respect to the other side, it is possible to select the length of the cover in the pipe axis direction as necessary to ensure that It is possible to set the maximum amount of expansion in the desired value, and it is possible to reliably prevent the pipe joint portion from slipping out. That is, even if a force is applied in the axial direction of the pipe due to a large earthquake, and the receiving end and the insertion end of the pipe end are removed, the airtightness can be maintained with the seismic reinforcement cover.
The seismic resistance of the pipeline can be greatly enhanced.

Further, since the seismic reinforcement cover is made of a flexible material such as plastic, resin, hard rubber or the like, bending stress is applied to the pipe joint portion due to a large earthquake or the like, and the pipe end receiving end and the insertion end are inserted. Even if the plug comes off
Since the seismic resistant cover can be deformed by following the bending stress to some extent, airtightness can be maintained and the seismic resistance of the pipeline can be greatly enhanced.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a plug-in type pipe joint portion of an existing pipeline,
As shown in the figure, the joint of the pipe 1 constituting the lifeline pipe has a receiving port 11 at the pipe end, and the pipe end of the other side pipe 2 facing the receiving port 11 is connected to the straight insertion port 21. Has become
The insertion port 21 is inserted into the receiving port 11, and the hemp skin 3, the lead 4, the rubber ring 5 and the like are fitted into the connection fitting portions of the both to secure the sealing property. In the example of FIG. 1, a flange 11a is provided at the end of the receiving port 11, and the push ring 6 arranged so as to face the flange 11a is fastened to the flange 11a of the receiving port 11 with a bolt 7 so that the above-mentioned seal member (linen) is pressed. We are trying to prevent the skin 3, lead 4, and rubber ring 5) from coming off.

FIG. 2 is an explanatory view of parts of the seismic reinforcement cover 8,
As shown in the figure, the earthquake-proof reinforcement cover 8 includes two semicircular halves 81 and 82 that are divided into two in the radial direction, a packing 83 formed of a rubber material or the like, and a bolt and nut fastener 84. The half body 81 and the half body 82 are formed of a flexible material such as plastic, resin, or hard rubber, and have the same stepped portions 81a, 8 as the outer shape of the receptacle 11 of the pipe 1.
2a, a tubular portion 81b formed to cover the periphery of the joint,
82b and a tubular portion 8 formed to have substantially the same outer shape as the pipe 2.
1 c, 82 c, and a seal material 85 such as a rubber material is arranged along the circumference inside the cylindrical portions 81 c, 82 c. By joining the halves 81 and 82 together, it is possible to attach the halves 81 to the existing pipe externally.

FIG. 3 is a side view showing a state in which the seismic reinforcement cover 8 is attached to an existing pipe, and FIG. 4 is a front view thereof.
When the seismic reinforcement cover 8 is attached, the earth and sand are dug to temporarily expose each connection portion (pipe joint portion) of the existing pipe. Then, the two halves 81, 82 are arranged along the joint and the pipes 1 and 2 on both sides thereof.
Cover upside down. At this time, a packing 83 having a sealing effect is sandwiched and joined between the halves 81 and 82. Further, the stepped portions 81a and 82a are connected to the receiving port 11 and the pipe 1 thereof.
It is fixed by an adhesive such as an adhesive resin. And half 81
The two halves 81, 82 are integrally joined by fastening the flange portions of the and 82 at a plurality of locations with the fastener 84.

In the pipe joint portion to which the seismic reinforcement cover 8 is attached as described above, the step 81 of the seismic reinforcement cover 8 is used.
a and 82a are fixed to the receiving port 11 and the entire pipe 1 in the circumferential direction with an adhesive, and a sealing material 85 is arranged inside the cylindrical portions 81c and 82c so that the sealing material 85 is the outer periphery of the piping 2. Since it is slidably adhered to the inside of the cover 8, the inside of the cover 8 is kept airtight.

Next, the operation of the present invention will be described with reference to FIG. When a large amount of underground changes due to an earthquake or the like, for example, when a strong force is applied in the pipe axis direction and the pipe 1 and the pipe are pulled together, as shown in the figure, the bolt 7 is broken or In some cases, the gas may leak due to the removal of the gas from the receiving opening 11 and the insertion opening 21. At this time, the seismic reinforcement cover 8 is fixed to the receiving port 11 side and slidably attached to the inserting port 21 side so as to cover the joint portion. The pipe 2 slides in the axial direction (leftward in the figure). Since a seal material 85 such as a rubber material is arranged along the outer periphery of the pipe 2 inside the seismic reinforcement cover 8 on the insertion port 21 side, the inside of the cover 8 is kept airtight. There is. As a result, even if the receiving end 11 and the insertion port 21 at the pipe end are disengaged, the airtightness can be maintained by the seismic reinforcement cover 8,
The seismic resistance of the pipeline can be greatly enhanced.

Further, since the seismic reinforcement cover 8 is made of a flexible material such as plastic or resin, hard rubber, etc., bending stress other than the pipe axis direction is applied to the pipe 1 and the pipe 2. Even when the torches break, the seismic reinforcing cover 8 can be deformed by following the bending stress to some extent, so that airtightness can be maintained and the seismic resistance of the pipeline can be greatly enhanced.

Next, another embodiment of the present invention will be described with reference to FIG. The seismic reinforcement cover 9 has two semi-circular halves 9 which are divided into two in the radial direction, as in the above-mentioned embodiment.
1, 92, a packing 93 formed of a rubber material or the like, and a bolt and nut fastener 94. The halves 91, 92
Is a large-diameter tubular portion 91a, 92a having a cross-sectional shape in the vicinity of the center so as to cover the pipe joint portion, tubular portions 91b, 92b formed substantially the same as the outer shape of the pipe 1, and the outer shape of the pipe 2. It is composed of the same cylindrical portions 91c and 92c, and a sealing material 95 such as a rubber material is arranged along the circumference inside the cylindrical portions 91b and 92b. Then, the halves 91 and 92 are fastened with fasteners 94 with the packing 93 sandwiched therebetween, and the tubular portions 91c and 92c are fixed to the pipe 2 with an adhesive material such as an adhesive resin, whereby the seismic reinforcement cover 9 is a pipe joint. It is attached while keeping airtightness in the part.

Next, when an earthquake or the like causes a large change in the underground, in the case of this embodiment, the seismic reinforcement cover 9 is inserted into the insertion opening 2
Since it is attached to the No. 1 side and slidably fitted to the No. 11 side so as to cover the joint part, the pipe 1 on the No. 11 side is axially (right in the figure) against earthquake fluctuations. Slide). Since the sealing material 95 such as a rubber material is arranged along the outer periphery of the pipe 1 inside the seismic reinforcement cover 9 on the side of the receiving port 11, the inside of the cover 9 is kept airtight. There is. As a result, even when the receiving end 11 and the insertion port 21 at the pipe end are unplugged, the airtightness can be maintained by the seismic resistant cover 9, and the seismic resistance of the pipeline can be greatly enhanced.

As described above, in the embodiment of the present invention, the seismic reinforcement covers 8 and 9 are explained so as to be adaptable to the plug-in type pipe joint part of the existing pipeline of the gas life line, but other types of water supply etc. Of course, it can be applied to a plug-in type pipe joint portion of a lifeline pipe line. Further, the shape of the cover is not limited to the embodiment.

[0023]

As described above, in the seismic strengthening device for a lifeline pipeline according to the present invention, since the seismic strengthening cover is a split type, it is particularly connected to a pipe joint portion which is often damaged by an earthquake. Since it can be easily attached to the existing lifeline pipeline and the leakage can be surely prevented, the earthquake resistance of the lifeline can be quickly and inexpensively realized.

Further, by mounting the seismic reinforcement cover, the pipe joint portion can be protected from corrosion due to rainwater and the like, and the durability of the pipe joint can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a plug-in type pipe joint.

FIG. 2 is an explanatory view of parts of the seismic reinforcement cover.

FIG. 3 is a side view showing a mounted state of the seismic reinforcement cover.

FIG. 4 is a front view showing a mounted state of the seismic reinforcement cover.

FIG. 5 is an explanatory diagram showing an operation.

FIG. 6 is an explanatory diagram showing another embodiment.

[Explanation of symbols]

 1 Piping 11 Receptacle 2 Piping 21 Insertion 3 Hemp skin 4 Lead 5 Rubber ring 6 Push ring 7 Bolt 8 Seismic reinforcement cover 81 Half body 82 Half 83 Packing 84 Fastener 85 Seal material 9 Seismic reinforcement cover 91 Half body 92 Half body 93 packing 94 fastener 95 sealing material

Claims (3)

[Claims] Claims: 1. Receptacles to be fitted to each other in a pipe joint portion of a lifeline pipeline in which a pipe end insertion opening of another pipe is inserted into a reception opening formed in a pipe end of one pipe and airtightly connected. Has a split-type seismic reinforcement cover that surrounds the entire outer periphery of the pipe joint portion between the insertion port and the insertion port, and one end side in the pipe axis direction of the cover is airtightly bonded and fixed to the outer peripheral surface of the receiving port. At the same time, the other end side is airtightly fitted so as to be slidable on the outer peripheral surface of the insertion opening, and is a seismic strengthening device for a lifeline pipeline. 2. Receptacles that are fitted to each other in a pipe joint portion of a lifeline pipeline in which a pipe end insertion opening of the other pipe is inserted into a reception opening formed in the pipe end of one pipe to hermetically connect Has a split-type seismic reinforcement cover that surrounds the entire outer periphery of the pipe joint portion across the space between the insertion port and the insertion port, and the cover is hermetically joined to the outer peripheral surface on the insertion port side at one end side in the pipe axis direction. A seismic strengthening device for a lifeline pipeline, which is fixed and has the other end slidably and airtightly fitted to the outer peripheral surface on the receiving side. 3. The seismic strengthening device for a lifeline pipeline according to claim 1, wherein the split-type seismic strengthening cover is made of a flexible material.