JP2003336491A - Earthquake proofing method in existing linear structure having inner space - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquake proofing method for an existing linear structure having an inner space without stopping the function of the existing linear structure having the inner space such as distribution of existing pipe under service and traffic in a tunnel. <P>SOLUTION: For performing earthquake proofing, ground 3 in the circumference of the existing linear structure having an inner space is excavated, the outer circumferential part of the concrete constituting the existing linear structure 2 is gouged, a weak part 4 easy to be broken in an earthquake is formed in the existing linear structure 2, and a base isolator 5 integrally composed of a base isolation material such as rubber based base isolation material and comprising a base isolation member 5A and an installation frame 5B is attached to the existing linear structure 2 covering the circumference of the weak part 4. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pipeline, a tunnel,
The linear structure itself that has an inner space such as a shaft, or
The present invention relates to a method for improving seismic resistance of an existing linear structure having an inner space connected to a structure such as a sewerage treatment facility, a station, a branch road, or a shaft under construction which has different seismic performance.

[0002]

2. Description of the Related Art Conventionally, for example, a drainage pipe, a gas pipe, a water pipe connected to a structure such as a sewerage treatment facility, or a pipe line for accommodating an electric wire, a telephone line, etc., a road, a railway. In the case of a linear structure such as a tunnel or a shield tunnel under construction, which has an inner space surrounded by walls, etc., when an earthquake occurs, the space between the structure and the linear structure Alternatively, relative displacement may occur in the construction joint portion of the linear structure, and stress may be concentrated on the linear structure or construction joint portion, resulting in large breakage.
When the linear structure is a linear underground structure such as a tunnel, groundwater may flow into the linear underground structure, and the linear structure may be a water channel such as sewage. If this happens, water leakage will occur due to this destruction. Furthermore, if the destruction is large, it will take a long time to recover. In addition, the linear structure having an inner space here refers to a linearly extending structure having a cavity inside, and the linear direction (horizontal, vertical, etc.) and cross-sectional shape (circular, substantially circular, rectangular, Polygons, combinations thereof, etc.) are not particularly limited, and the fracture includes cracks in walls for forming the inner space, and the like below. Also, even in places where the quality of the buried ground changes suddenly, stress concentrates near the boundary of the ground of the linear structure during an earthquake,
Large destruction is likely to occur. Therefore, when a new linear structure having an inner space is newly installed, the location where the stress is likely to be concentrated is reinforced in advance, or the joint portion is made to have a flexible structure to improve the earthquake resistance. .
In the case of a shield tunnel, seismic isolation material is injected into the tunnel instead of the conventional backfill injection material, especially at locations where the quality of the ground changes suddenly (weak areas). A method of avoiding the stress concentration on the above-mentioned weak part is performed by forming a seismic isolation layer between the ground and the ground.

[0003]

However, the technology for seismic retrofitting existing linear underground structures such as existing pipelines and tunnels in service has not been established at present, and in the case of seismic retrofitting, In order to reinforce locations where stress is likely to be concentrated from the inside, the distribution and passage of the above pipelines and tunnels are temporarily interrupted to stop the function as a linear structure, and the pipelines and tunnels are cut and detoured. It was necessary to set up a road.

The present invention has been made in view of the conventional problems, and does not stop the function of the existing linear structure such as the flow of the existing pipeline in service, the passage of tunnels, etc. An object of the present invention is to provide a method for earthquake-proofing an existing linear structure having an inner space.

[0005]

According to a first aspect of the present invention, there is provided an earthquake resistance method for an existing linear structure having an inner space,
Welding pipes, gas pipes, water pipes, shield tunnels under construction, and other existing line-shaped structures that have an inner space surrounded by walls, etc., should be provided with weak areas that are easily damaged during an earthquake. , The existing linear structure is installed with a seismic isolation member or seismic isolation device so as to cover the periphery of the weak part, and stress during the earthquake is concentrated and applied to the weak part. Therefore, even if the weak portion is deformed or destroyed, the surroundings of the weak portion are covered with a seismic isolation member or a seismic isolation device, so that it is possible to prevent the inflow of groundwater into the existing linear structure. , If the existing linear structure is a waterway, prevent the leakage of water, etc. from the inside of the existing linear structure to the outside, and retain the function of the existing linear structure having an inner space. It becomes possible to do.

According to a second aspect of the present invention, there is provided an earthquake-proofing method for an existing linear structure having an inner space, wherein an outer peripheral portion of the existing linear structure is slung, and the slanted portion is used as the weak portion. In the seismic retrofitting method for an existing linear structure having an inner space according to claim 3, a seismic isolation member or a seismic isolation device is attached so as to cover the construction joint portion of the existing linear structure. It is a thing. That is, since the construction joint part of the existing linear structure having the inner sky is a weak part that is easily destroyed in the event of an earthquake, by covering the circumference of this construction joint part with a seismic isolation member or seismic isolation device, Even if the joint part is broken, the function of the existing linear structure can be maintained.

According to a fourth aspect of the present invention, there is provided a seismic isolation method for an existing linear structure having an inner space, wherein the seismic isolation device is, for example, an asphalt seismic isolation material, a urethane seismic isolation material, a silicone seismic isolation material, It is characterized in that a seismic isolation material such as a rubber-based seismic isolation material is integrated with an installation frame attached to an existing linear structure so as to cover the periphery of the weak portion. Further, according to the method for earthquake-proofing an existing linear structure having an inner space according to claim 5, an installation frame is provided around the weak portion or the construction joint part of the existing linear structure, and an installation frame is provided within the installation frame. It is characterized in that seismic material is injected to cover the above-mentioned weak portion or the construction joint portion. Further, a method for earthquake-proofing an existing linear structure having an inner space according to a sixth aspect is characterized in that the seismic isolation device is configured by a flexible joint or a flexible segment.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 (a) and 1 (b) are views showing a method of earthquake-proofing an existing linear structure having an inner space according to Embodiment 1 of the present invention, in which (a) is a side section and (b) is a diagram. Is a cross-sectional view taken along line AA of FIG. In each figure, 1 is a sewerage treatment facility, a station, a branch road, or a structure such as a vertical shaft under construction, 2
Is an existing linear structure (hereinafter referred to as an existing linear structure) having an inner space such as a concrete pipe line or tunnel that is embedded in the ground 3 and connected to the structure 1. Although its cross-sectional shape is a rectangular frame shape, it may be another cross-sectional shape such as a ring shape. Reference numeral 4 denotes a weak portion of the existing linear structure 2 which is formed by injecting concrete of the outer peripheral portion of the existing linear structure 2 to a predetermined thickness, and 5 denotes the above-mentioned outer peripheral portion of the existing linear structure 2. The seismic isolation device is attached so as to cover the periphery of the weak portion 4. As shown in FIG. 2, the seismic isolation device 5 is a device in which a seismic isolation member 5A made by processing a rubber seismic isolation material into a rectangular frame shape is attached to the inner peripheral side of a rectangular installation frame 5B to be integrated, In this example, the installation frame 5B is divided into an upstream portion 5a and a downstream portion 5b of the existing linear structure 2 so as not to restrain the deformation of the seismic isolation member 5A, and the upstream portion 5a and the downstream portion are separated. 5s gap between 5b
Is provided. In addition, 5e is the upstream portion 5a of the installation frame.
Side mounting portion (flange portion) 5f is a mounting portion (flange portion) on the downstream portion 5b side of the installation frame.

Next, the procedure of the earthquake resistance processing according to the present invention will be described. First, the ground 3 around the existing linear structure 2 to be subjected to the earthquake resistance treatment is excavated to expose the outer peripheral surface of the concrete forming the existing linear structure 2. Next, the concrete of the portion to be subjected to the earthquake resistance treatment is attached to reduce the wall thickness of the portion to form the weak portion 4 in the existing linear structure 2 that is easily broken during an earthquake. Then, the seismic isolation device 5 having the above configuration is attached to the existing linear structure 2 so as to cover the periphery of the weak portion 4. Specifically, a mounting member 6 such as a bolt is inserted into the mounting holes 5p and 5q provided in the flanges 5e and 5f to move the installation frame 5B upstream from the weak portion 4 of the existing linear structure 2. By mounting the side portion 2a and the downstream side 2b of the weak portion 4 in a straddling manner, the periphery of the weak portion 4 is covered by the seismic isolation member 5A integrally mounted in the installation frame 5B. After the seismic isolation device 5 is attached, the area around the existing linear structure 2 is backfilled to complete the earthquake resistance process.

At the location where the seismic isolation device 5 has been made seismic resistant, the seismic isolation member 5A absorbs the shearing force due to the earthquake, so that the seismic resistance of the existing linear structure 2 can be improved. In addition, the shear stress due to the earthquake is large and the weak portion 4 is destroyed, and, for example, as shown in FIG. 3, the upstream side 2a and the downstream side 2b of the existing linear structure are deviated in the vertical direction. However, the seismic isolation member 5A that covers the periphery of the weak portion 4 is only deformed, and the upstream side 2a of the existing linear structure is
Since the downstream side 2b is not separated from the downstream side 2b, the inflow of groundwater into the existing linear structure 2 can be prevented. In addition, when the existing linear structure 2 is a water channel, water and the like in the existing linear structure 2 does not leak outside, so that the function of the existing linear structure 2 is sufficiently retained. can do. Further, in this example, since the installation frame 5B is divided into the upstream portion 5a and the downstream portion 5b, the seismic isolation member 5A is not constrained by the installation frame 5B, and the existing linear structure 2 is deformed. It can be transformed along with. Further, the seismic isolation member 5A not only absorbs the shear stress due to the earthquake, but also the existing linear shape due to the shear stress, the torsional stress, and the temperature change caused by the uneven settlement of the ground 3 in which the existing linear structure 2 is buried. Since the expansion and contraction of the structure 2 can also be absorbed, the durability of the existing linear structure 2 can be improved. In addition, the earthquake resistance treatment of the present invention, as described above,
Since it is performed from the outside of the existing linear structure 2,
It is possible to make the existing linear structure 2 earthquake-proof without stopping the function of the existing linear structure 2 due to the interruption of the circulation or passage in the existing linear structure 2 in service. Furthermore, by providing the weak portion 4 that is destroyed in advance in the event of an earthquake, not only the damage of the entire existing linear structure 2 due to the earthquake can be prevented, but also the position of the weak portion 4 can be provided at an arbitrary position. , You can control the point of destruction. As a result, it is not necessary to subject the entire existing linear structure 2 to seismic treatment, so that the cost and construction period can be reduced.

As described above, according to the first embodiment, the ground 3 around the existing linear structure 2 having the inner space to be subjected to the earthquake resistance treatment is excavated, and the concrete forming the existing linear structure 2 is reinforced. A rubber-based seismic isolation system is attached to the existing line-shaped structure 2 so as to cover the periphery of the weakened part 4 while forming a weakened part 4 that is easily broken during an earthquake on the existing line-shaped structure 2. The seismic isolation device 5 in which the seismic isolation member 5A made of a material is integrated with the installation frame 5B is attached, and the above existing linear structure 2 is attached during an earthquake.
Since the stress acting on the weak portion 4 is applied to the weak portion 4, even if the weak portion 4 is deformed or destroyed during an earthquake, inflow of groundwater into the existing linear structure 2 or the existing line It is possible to prevent water and the like from leaking out from the linear structure 2, and it is possible to maintain the function of the existing linear structure 2. In addition, seismic retrofitting is applied to the existing linear structure 2
Since it is performed from the outside of the existing linear structure 2 without stopping the function of the existing linear structure 2 in service.
Can be earthquake resistant. Further, by providing the weak portion 4, it is possible to prevent damage to the entire existing linear structure 2 due to an earthquake. Moreover, since the position of the weak portion 4 can be provided at an arbitrary position, the breaking point can be controlled. Therefore, since it is not necessary to make the entire existing linear structure 2 earthquake-proof, the cost and construction period can be reduced.

In the first embodiment, the seismic isolation member 5 is used.
The case where a rubber-based seismic isolation material is used as A has been described, but the present invention is not limited to this.
Similar effects can be obtained by using other seismic isolation materials such as urethane seismic isolation materials and silicone seismic isolation materials. In the above example, the seismic isolation device 5 in which the seismic isolation member 5A is integrated with the installation frame 5B is used to make the existing linear structure 2 seismic resistant. For example, as shown in FIG. After the frame member 7 having the liquid injection port 7k is attached to the existing linear structure 2 so as to cover the periphery of the weak portion 4, the asphalt-based seismic isolation material, the urethane-based seismic isolation material from the liquid injection port 7k, A seismic isolation layer 8 covering the periphery of the weak portion 4 by injecting and solidifying a seismic isolation material such as a silicone seismic isolation material or a liquid rubber seismic isolation material.
May be formed. In this case, since the seismic isolation layer 8 is also filled in the flared portion of the weak portion 4, the seismic resistance of the existing linear structure 2 is improved. The frame member 7
May be removed after the seismic isolation material is solidified, or may be left as it is. When leaving it as it is, it is preferable that the frame member 7 is a split mold as in the first embodiment.

A flexible rubber joint 10 as shown in FIG. 5 may be used as a seismic isolation device for covering the periphery of the weak portion 4. This flexible rubber joint 10 includes a U-shaped rubber member 11
Both end portions of the two are sandwiched between two frame bodies 12A and 12B facing each other with a predetermined distance therebetween, thereby elastically connecting two members respectively attached to the two frame bodies 12A and 12B. Bind to. In the figure, 13A and 13B are lid members which are connected by a waterproof rubber 14 and which cover the respective frame bodies 12A and 12B from the outside. One frame 12A of the flexible rubber joint 10 is attached to the upstream side 2a of the existing linear structure, and the other frame 12B is attached to the downstream side 2b thereof using the attaching members 15 such as bolts. As shown in FIG. 6, the shear stress due to the earthquake is large and the above-mentioned weak stress is exerted at the location where the flexible rubber joint 10 serving as the seismic isolation device covers the periphery of the portion 4 to make it earthquake-proof. Even when the portion 4 is destroyed and the upstream side 2a and the downstream side 2b of the existing linear structure are vertically displaced, the rubber member 11 covering the periphery of the weak portion 4 is simply deformed, and the upstream side 2a Since it is not separated from the downstream side 2b, the inflow of groundwater into the existing linear structure 2 can be prevented. In addition, the existing linear structure 2
If it is a water channel, water and the like in the existing linear structure 2 will not leak outside, so that the function of the existing linear structure 2 can be sufficiently retained. It is preferable to use a known flexible segment when performing an earthquake resistance treatment on an existing linear structure having an inner space having a large ring-shaped cross section such as a tunnel. That is, if a plurality of flexible segments are assembled in a ring shape and attached to the existing linear structure so as to cover a portion including the weak portion of the existing linear structure, a large diameter can be obtained. Even an existing linear structure having an inner space can be sufficiently earthquake-proofed.

Embodiment 2. Although the case where the weak portion 4 is formed on the existing linear structure 2 by attaching the outer peripheral portion of the existing linear structure 2 has been described in the first embodiment, the circumference of the construction joint portion of the existing linear structure 2 is described. In the case of performing the seismic resistance treatment, the construction joint portion may be covered with the seismic isolation device without providing the existing linear structure 2 with a weak portion.
As shown in FIG. 7 (a), the construction joint portion is a location where the first existing linear structure 2 A and the second existing linear structure 2 B are connected with a water-stop seal (not shown) interposed therebetween. so,
First existing linear structure 2A and second existing linear structure 2B
And are concrete is joined to each other, apparently integral, but the bond is weak. That is, since the first existing linear structure 2A and the second existing linear structure 2B are separated by the construction joint portion 2J and are not structurally integrated, they are weak portions that are easily broken during an earthquake. . Therefore,
As shown in FIG. 7B, the seismic isolation device 5 described in the first embodiment, the seismic isolation layer 8 described above, or the flexible rubber joint 10 and the flexible structure around the construction joint portion 2J. Even if the construction joint 2J is destroyed by covering it with a seismic isolation member such as a segment or seismic isolation device,
It is possible to prevent the inflow of groundwater into the existing linear structure 2. Further, when the existing linear structure 2 is a water channel, it is possible to prevent water and the like in the existing linear structure 2 from leaking to the outside.

In the first and second embodiments described above, the existing linear structure 2 buried in the underground has been described as the existing linear structure 2 having an inner space, but the present invention is not limited to this. The same effect can be obtained also in an existing linear structure having an inner sky whose periphery is covered with a wall, such as a portion exposed on the ground or a pipeline installed on the ground.

[0016]

As described above, according to the present invention,
A seismic isolation member or seismic isolation device is provided so that an existing linear structure having an inner space is provided with a weak portion that is easily damaged in the event of an earthquake, and the existing linear structure having an inner sky covers the periphery of the weak portion. Since it is attached, even if the weak part is destroyed in the event of an earthquake, the surroundings of the weak part are covered with seismic isolation members or seismic isolation devices, so the inflow of groundwater into the existing linear structure can be prevented. Can be prevented. Further, when the existing linear structure is a water channel, water and the like in the existing linear structure 2 does not leak outside, so that the function of the existing linear structure is sufficiently retained. be able to. Further, in the present invention, since the earthquake resistance treatment is performed from the outside of the existing linear structure, the function of the existing linear structure such as distribution and passage in the existing linear structure in service It can be earthquake-proofed without stopping. Regarding the construction joint part, the construction joint part itself becomes a weak part of the existing linear structure having the inner space, so the construction joint part should be covered with a seismic isolation member or seismic isolation device without providing a weak part. Thereby, even if the construction joint portion is broken, it is possible to prevent the inflow of groundwater into the existing linear structure. Further, when the existing linear structure is a water channel, it is possible to prevent water and the like in the existing linear structure 2 from leaking to the outside. Further, since the earthquake resistance treatment is performed only on the weak portion or the joint portion, the cost and the construction period can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a method for earthquake-proofing an existing linear structure having an inner space according to a first embodiment.

FIG. 2 is a perspective view of the seismic isolation device according to the first embodiment.

FIG. 3 is a diagram for explaining the operation of the seismic isolation device.

FIG. 4 is a diagram showing another example of a method for earthquake-proofing an existing linear structure having an inner space according to the present invention.

FIG. 5 is a diagram showing a method of earthquake resistance using a flexible rubber joint.

FIG. 6 is a view for explaining the action of the flexible rubber joint.

FIG. 7 is a diagram showing a method of earthquake-proofing an existing linear structure having an inner space according to the second embodiment.

[Explanation of symbols]

1 structure, 2 existing linear structure having an inner space, 2a
Upstream side (from the weak portion) of the existing linear structure, 2b Downstream side (from the weak portion) of the existing linear structure, 2A First existing linear structure, 2B Second existing linear structure 2J Construction joint part, 3 Ground, 4 Weak part of existing linear structure having inner space, 5 Seismic isolation device, 5A seismic isolation member, 5B installation frame, 5a upstream part of installation frame, 5b downstream part of installation frame 5e, 5f Flange portion of installation frame, 5p, 5q mounting hole, 5s gap, 6 mounting member, 7 frame member, 7
k Liquid inlet, 8 seismic isolation layer, 10 flexible rubber joint.

Claims (6)

[Claims] 1. A seismic isolation member or seismic isolation device is provided on an existing linear structure having an inner space to provide a weak portion that is easily damaged during an earthquake, and to cover the existing linear structure around the weak portion. An earthquake resistance method for an existing linear structure having an inner space, characterized in that a device is attached. 2. The outer peripheral portion of the existing linear structure is suspended,
The method for earthquake-proofing an existing linear structure having an inner space according to claim 1, wherein the weak portion is formed. 3. Seismic resistance in an existing linear structure having an inner space, characterized in that a seismic isolation member or a seismic isolation device is attached so as to cover the construction joint portion of the existing linear structure. Method. 4. The seismic isolation device is characterized in that seismic isolation material is integrated with an installation frame attached to the existing linear structure so as to cover the periphery of the weak portion. An earthquake resistance method for an existing linear structure having an inner space according to any one of claims 1 to 3. 5. An installation frame is provided around the weak portion or the construction joint portion of the existing linear structure, and seismic isolation material is injected into the installation frame to cover the periphery of the weak portion or the construction joint portion. The method for earthquake-proofing an existing linear structure having an inner space according to any one of claims 1 to 3, characterized in that. 6. The seismic isolation device is constituted by a flexible joint or a flexible segment, and the seismic resistance of the existing linear structure having an inner space according to any one of claims 1 to 3 is characterized. Method.