JP3759074B2 - Seismic isolation system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation system used for a lightweight structure such as a detached house.
[0002]
[Prior art]
The seismic isolation system for lightweight structures is a seismic isolation system that has horizontal rigidity that is much lower than the rigidity of the lightweight structure between the foundations such as the ground and floor and the lightweight structure such as a detached house. Members are used. This type of seismic isolation member is a seismic isolation system that is a combination of a sliding bearing that has almost zero rigidity after the start of sliding and a restoration rubber that is made of laminated rubber or vibration-proof rubber and has the function of restoring the sliding bearing to its origin. There is a system. In the seismic isolation system, almost all loads of lightweight structures such as detached houses are supported by sliding bearings and almost no load is applied to restoring rubber, and both sliding bearings and restoring rubber are used. Some have a load bearing function.
[0003]
In the sliding bearing, an elastic sliding bearing, in which laminated rubber consisting of alternately laminated rubber-like elastic bodies and metal plates is arranged in series on one side of the sliding material, and only the sliding material or thin rubber-like elastic bodies are arranged in series. There is a rigid sliding support. Each of the sliding supports includes a sliding plate and a sliding material that are slidably provided on a foundation such as the ground and a lightweight structure such as a detached house. For lightweight structures such as detached houses that are not specially used, a rigid sliding bearing without a laminated rubber part is more economically suitable.
[0004]
As a sliding material, tetrafluoroethylene resin (PTFE) has been used for a long time. However, recently, polyamide-based resins such as nylon, which are higher in strength and wearability than PTFE, are economical. became. As the sliding plate, a stainless steel plate coated with a stainless steel plate or a fluororesin is used.
[0005]
In the seismic isolation system, the sliding material normally supports the load of a light-weight structure such as a detached house, and the sliding material slides on the sliding plate during an earthquake. Absorbs seismic energy as thermal energy. The lightweight structure moved horizontally during the earthquake is restored to its origin (normal structure position) by restoring rubber.
[0006]
The sliding material slides on the sliding plate when a horizontal force exceeding the coefficient of static friction is applied. Since the rigidity of the sliding bearing after the start of sliding becomes almost zero, the seismic isolation layer can be lengthened by arbitrarily setting the rigidity of the restoring rubber.
[0007]
[Problems to be solved by the invention]
By the way, the conventional techniques as described above have the following problems to be solved.
In a light-weight structure with a small scale, it is difficult to secure a response displacement and a margin space with respect to the ground motion of the seismic isolation structure because the site is small.
[0008]
For example, in the case of a normal type sliding bearing in which a sliding plate is installed on the foundation and the sliding material is fixed to the bottom layer of a lightweight structure via a support (bundle), the same space is not secured. If a protruding object, such as a foundation rising part, is randomly placed near the sliding bearing, the sliding bearing may collide with the protruding object when the lightweight structure undergoes a response displacement against earthquake motion. It may hinder horizontal movement of objects.
[0009]
The above-mentioned normal type sliding bearings have the sliding surface of the sliding plate facing upward at all times, and the sliding plate is installed at almost the same level as the foundation surface. In addition, it was necessary to take measures to prevent infiltration such as water leakage and performance degradation due to animal nests, excrement, dust, and the like.
[0010]
In addition, seismic isolation structures using sliding bearings have traditionally been designed to attach the sliding plate and sliding material separately to the foundation and the bottom layer of the structure, but this installation requires a high degree of accuracy. Work is difficult.
[0011]
Wooden detached houses with seismic isolation structures use a reinforced concrete structure flooring between the bottom horizontal member (base) and the base isolation member, and the base isolation part has a base isolation member. Although it was installed, compared with a detached house by the wooden conventional construction method, the floor plan work such as reinforced concrete construction is added and the construction period becomes longer, and the construction cost also increases.
On the other hand, if it is a wooden detached house using a seismic isolation structure and does not use reinforced concrete or other floorboards, the horizontal member will bend about 1/250. There was a problem that we could not respond.
[0012]
The present invention has been made paying attention to such a point, can reduce the installation space, can improve the construction accuracy, reduce the construction cost, and can maintain a stable seismic isolation performance for a long period of time. The purpose is to provide a seismic isolation system.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention adopts the following configuration.
<Configuration 1>
The sliding support body is formed by arranging a sliding material on the upper end of the support column that is erected on the foundation part, and is fixed to the lowermost layer of the light wooden structure installed above the foundation part, and is slid onto the sliding material. In a seismic isolation system including a sliding plate that is movably contacted, a reinforcing body in which a rib is erected in a rectangular frame is fixed on the upper surface of the sliding board, and the reinforcing body A seismic isolation system characterized in that the lowermost wooden horizontal member of a lightweight structure can be directly attached so as to be in contact with the outside of the frame .
[0014]
<Configuration 2>
In seismic isolation system configuration 1, wherein the reinforcing body, and the frame member is secured to the upper surface of the plurality of plate members are assembled in a rectangular said sliding plate, is provided so as to intersect the inner side of the frame A seismic isolation system comprising the above ribs.
[0015]
<Configuration 3>
In the seismic isolation system according to Configuration 1 or 2, at least two plate members stacked at the center via a ball bearing are disposed between the upper portion of the support column and the sliding material. Seismic isolation system.
[0017]
Embodiments of the seismic isolation system of the present invention will be described below with reference to the drawings.
FIG. 1 is a view showing an outline of an embodiment of the present invention, FIG. 2 shows a rigid sliding bearing used in the embodiment, and FIG. 3 is an exploded view of a part of the components shown in FIG. It is a perspective view.
[0018]
In these drawings, reference numeral 1 denotes a base part made of reinforced concrete on the ground, and 2 denotes a lightweight structure such as a wooden detached house constructed above the base part 1. A base rising portion 3 protruding upward is provided on the outer edge of the base portion 1.
The seismic isolation system of the present invention includes a sliding bearing body 10 installed on the foundation 1 and a sliding plate 11 fixed on the lowermost layer of the lightweight structure 2.
[0019]
FIG. 2 shows a main part of the sliding support main body 10. The sliding support body 10 is disposed on a support (bundle) 14 having flanges 12 and 13 at the upper and lower ends, a slide 16 fixed to a plate-like holder 15, and the upper flange 12 of the support 14. Intermediate plate member 18, ball bearing (steel ball) 19 disposed between hemispherical recesses provided at the center of each of the opposing surfaces of upper flange 12 and intermediate plate member 18, and intermediate plate member 18 and an inclination absorbing material disposed between the holder 15 and a rubber elastic sheet 20 as a cushioning material.
[0020]
The support column 14 adjusts the mounting position (height) of the sliding member 16 so as to be higher than the basic rising portion 3, and is formed by intersecting two plate members in a cross-shaped cross shape.
The upper flange 12 of the support column 14 and the holder 15 are connected via the spring washer 17 by the four bolts 21 with the intermediate plate member 18 interposed. The intermediate plate member 18 can be tilted with respect to the upper flange via a ball bearing 19 within a range in which this connected state can be maintained, and the holder 15 is vertically moved with respect to the intermediate plate member 18 via a rubber elastic sheet 20. It is supposed to be movable.
[0021]
The sliding member 16 is molded into a cylindrical shape using a main component of a polyamide-based resin such as tetrafluoroethylene resin (PTFE) or nylon. The sliding plate 11 is a stainless steel plate coated with a stainless steel plate or a fluororesin.
The upper flange 12 and the like of the holder 15 and the support column 14 have dimensions that have an appropriate mechanical strength that does not change the performance of the sliding bearing.
[0022]
In addition, instead of the ball bearing 19, a rubber elastic sheet 22 having an appropriate thickness may be interposed between the upper flange 12 of the support column 14 and the intermediate plate member 18, as shown in FIG. 4 is the same as the configuration shown in FIG. 2 except for the place where the ball bearing 19 is provided, and therefore, the same reference numerals as those in FIG.
[0023]
FIG. 3 shows a sliding plate 11 fixed to the lowermost layer of the lightweight structure 2. On the upper surface of the sliding plate 11, a reinforcing body 25 having a plurality of ribs 24 standing is fixed. The reinforcing body 25 includes a frame body in which four plate members are assembled into a quadrilateral size that fits inside the outer edge of the sliding plate 11, and a plurality of plate members are radially intersected inside the frame body. The rib 24 is provided, and is integrally fixed to the upper surface of the sliding plate 11 by welding or the like.
[0024]
When installing the sliding support body 10 and the sliding plate 11 between the foundation 1 and the lightweight structure 2 such as a detached house, the sliding support body 10 and the sliding plate 11 with the reinforcing body 25 are in a predetermined assembled state. It is temporarily fixed by a temporary fixing material 27 such as a rope and is transported from the factory to the site, and is arranged as it is at a predetermined position of the base portion 1, and then the temporary fixing material 27 is removed. Next, the lowermost horizontal member 28 of the lightweight structure 2 is directly attached to the frame of the reinforcing body 25 by the attachment bolts 29. The horizontal member 28 may be formed of a wooden accumulation material.
[0025]
On the horizontal member 28 thus fixed, the structural plywood and the finishing material 30 of the lightweight structure 2 are provided. An existing heat insulating material 31 is disposed below the structural plywood and finishing material 30 as necessary.
The above embodiment is configured as described above, and normally supports the load of the lightweight structure 2, and the sliding material 16 slides on the sliding surface of the sliding plate 11 during an earthquake.
[0026]
The present invention can be applied not only to a detached wooden house but also to a similar lightweight structure, and provides the following effects.
In the present invention, since the sliding surface of the sliding plate 11 is always directed downward by attaching the sliding plate 11 of the sliding support to the lowermost layer of the lightweight structure 2, damage deterioration due to solar radiation of the sliding support, storm, water leakage, etc. As a result, it is not necessary to take measures for maintenance of the sliding plate 11, and durability is improved.
[0027]
Since the sliding surface between the sliding member 16 and the sliding plate 11 is positioned higher than the foundation rising portion 3 used for the foundation of the lightweight structure 2, as shown in FIG. The plate 11 can be wrapped, and at least this wrap portion can reduce the installation space of the seismic isolation system as compared with the conventional seismic isolation structure described above. Moreover, it is possible to avoid a collision between the sliding bearing and the foundation rising portion 3 at the time of an earthquake.
[0028]
The sliding plate 11 has a structure in which ribs are reinforced by the reinforcing body 25, so that the sliding plate 11 has sufficient rigidity to receive an upper load, and a floor plate made of reinforced concrete is interposed between the lightest structure 2 and the lowermost layer. Without being provided, the wooden horizontal member 28 can be directly attached with a bolt 29 or the like.
[0029]
Further, since a concrete floor board is not used for the lowermost layer of the lightweight structure 2, the upper structure can be easily removed and attached, and there is room for fluctuations in the axial force. Therefore, it can be reused even if remodeling work such as rebuilding occurs in the future.
[0030]
The sliding support body 10 and the sliding plate 11 are assembled and manufactured as a unit by the temporary fixing material 27 at the factory, transported, and attached to the base part 1 minute at the construction site, so that the construction accuracy can be achieved regardless of the quality of the operator. After that, the temporary fixing material 27 is removed at the time of constructing the structure, so that the structure is stabilized during the construction, and the safety during the construction is improved.
[0031]
As shown in FIG. 2, the sliding bearing body 10 has a ball bearing 19 inserted between two plate members (the upper flange 12 and the intermediate plate member 18 of the column 14). Even if deformation such as twisting, cracking, or creeping or bending occurs over a long period of time, depending on the type of wood, dry state, location used, etc., it is possible to follow such deformation. . Further, since the rubber elastic sheet 20 for absorbing inclination is arranged, it is possible to follow irregular rotation generated in the slip plate 11 at the time of an earthquake.
[0032]
【The invention's effect】
As described above, according to the present invention, the sliding support can follow the deflection of the horizontal member, and the rib member is provided on the upper surface of the sliding plate, so that the horizontal member can be directly attached to the sliding plate. Also, in the factory, the sliding plate and the sliding support body are temporarily integrated using temporary fixing materials, and transportation and installation on site are performed in this integrated state, thereby streamlining construction and improving construction accuracy. It brings about the effect of reducing the construction cost and demonstrating stable seismic isolation performance over a long period of time.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a seismic isolation system according to the present invention.
FIGS. 2A and 2B are diagrams showing a main part of a sliding support body used in the embodiment, in which FIG. 2A is a partially longitudinal front view, and FIG. 2B is a bottom view;
FIG. 3 is a perspective view showing a part of the components shown in FIG.
FIG. 4 is a partially longitudinal front view showing another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Foundation part 2 Lightweight structure 3 Foundation rising part 10 Sliding support body 11 Sliding plate 12, 13 Flange 14 Post (bundle material)
15 Holder 16 Sliding material 18 Intermediate plate member 19 Ball bearings 20 and 22 Rubber elastic sheet 24 Rib 25 Reinforcing body 27 Temporary fixing material 28 Horizontal material

Claims (3)

The sliding support body is formed by disposing a sliding material on the upper end of a column that is erected on the foundation, and the lowermost layer of a light wooden structure installed above the foundation is fixed to the sliding material. In a seismic isolation system with a sliding plate that can be moved freely,
On the upper surface of the sliding plate, a reinforcing body in which a rib is erected in a rectangular frame is fixed, and a wooden horizontal member at the lowest layer of the lightweight structure is attached to the outer side of the frame. A seismic isolation system characterized in that it can be installed directly in contact . In the seismic isolation system according to claim 1,
The reinforcing body, the frame and body, which is fixed to the upper surface of the sliding plate a plurality of plate members are assembled in a rectangular, in that a said rib provided so as to intersect the inner side of the frame A seismically isolated system. In the seismic isolation system according to claim 1 or 2,
A seismic isolation system, wherein at least two plate members overlapped with a ball bearing at a central portion are disposed between an upper portion of the support column and the sliding member.

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