JP3118964U - Seismic isolation method for a traditional private house with pillars built on stone - Google Patents

Abstract

[Task]
According to the current Building Standards Act, a wooden base is set up horizontally at the bottom of a wooden house, and a pillar is built on it. However, there are many so-called “stone-house-built” traditional houses that have pillars placed directly on stones and do not have a foundation, which is dangerous for the earthquake. In order to make this conform to the current law, it takes a lot of construction work and a lot of money, and it would effectively recommend renovation.
[Solution]
Therefore, we propose a method that can be seismically reinforced with a simple method, while retaining the goodness of traditional architecture. At present, it is common sense to fix the building to the ground, but traditional private houses are not fixed to the ground, just a pillar on a stone. Therefore, by making the floor of the first floor rigid and supporting the pillars under the floor like a cantilever from the first floor, it becomes a seismic isolation method in the event of an earthquake, and can protect the lives of residents.
[Selection] Figure 4

Description

This idea relates to the seismic construction method for traditional Japanese houses.
According to the current Building Standards Act, a wooden base is set up horizontally at the bottom of a wooden house and a pillar is built on it. However, many traditional so-called “stone-house built” private houses that do not have pillars built directly on stones remain dangerous for the earthquake. In order to make this conform to the current law, it takes a lot of construction work and a lot of money, and it would effectively recommend renovation. Therefore, we propose a method that can be seismically reinforced with a simple method, while retaining the goodness of traditional architecture.
[Background technology]

In conventional technology, it is common sense to fix a building to the ground, and everyone is looking at the earthquake-proof repair of a traditional private house that is not fixed to the ground just by placing a pillar on the stone. Absent.
[Disclosure of device]
[Problems that the device tries to solve]

The lower part of the pillars of a traditional private house without a foundation is not connected to each other. Therefore, by making the floor of the first floor rigid and supporting the pillars under the floor like a cantilever beam from the first floor, it becomes a seismic isolation method in the event of an earthquake and can protect the lives of residents.
[Means for solving problems]

1. The horizontal surface should be rigid so that seismic forces are evenly transmitted to the columns.
Roof surface The back of the ceiling of a private house is often used as a storeroom, etc. Here, a structural plywood is stretched to create a rigid horizontal surface.
Under the floor tatami mats, floor boards are laid, but in the traditional method, there is no idea of horizontal rigidity, so many nails are not hit. Therefore, this floor board is removed and a structural plywood of the same thickness is nailed to increase the horizontal rigidity.
2. The vertical is soft and increases earthquake resistance.
The wall surface (vertical surface) uses conventional seismic reinforcement methods, but uses rigid bracing and structural plywood as much as possible. For this reason, we make use of the softness of traditional construction methods using joint dampers and rough wall panels that have already been developed.
3. Harden the pillars under the floor.
The lower part of the pillar that reaches the top of the stone under the floor is sandwiched in both vertical and horizontal directions with wood, etc., and firmly fixed with nails or hardware. The column below the floor on the first floor made rigid in this way is considered as a cantilever beam that can withstand seismic force (horizontal force). The calculation method examines the cross section to determine whether the column under the floor can withstand the horizontal force (shear force) and moment so that the horizontal force of the ramen structure is allocated to the column. In order to strengthen the flooring, the existing pulling will be fastened with pillars and hardware.
[Effect of device]

The roof and the ground floor are rigid with structural plywood, so the seismic force acts equally on the columns. The pillar on the stone looks like a foot growing from a rigid floor and is not tied to the foundation or foundation, so it has a “pin” structure under the pillar. Under normal conditions, there is a vertical load, so the column does not move due to frictional force, but it may move horizontally during a large earthquake with vertical motion. However, when it moves, the pillars become “rollers” and are seismically isolated, so no further seismic force is applied.
Even if there is horizontal movement of the building, it is relatively easy to repair because the floor is solid. If you want to avoid horizontal movement, you can prevent horizontal movement by installing buttresses at the bases of the four corners of the building.
[Best Mode for Carrying Out the Invention]

At present, the earthquake-resistant diagnosis system is deployed in local governments nationwide, but even if it is diagnosed that renovation is necessary, it will be a big construction to set up the foundation and put the foundation, and it will cost as much as renovation. For this reason, there are many people who cannot afford to bear the construction cost and continue to live in dangerous houses. In such a case, this construction method is simple and inexpensive, and it can be confidently recommended because it allows construction while living.
In addition, since this construction method does not correspond to the majority repair or remodeling of the main structural part, there is no need to apply for confirmation under the Building Standards Act, and only the seismic reinforcement work that protects the lives of residents can be performed.
[Example] None. (However, implementation is under consideration.)

[Industrial applicability]

  This utility model does not require advanced technology, but on the other hand there is a possibility that poor construction may occur, so it is necessary to create a technical standard. According to this standard, any carpenter who has worked on traditional houses can construct a house, which contributes to the revitalization of the local building industry and the safety of residents.

[Fig. 1] Current construction method [Fig. 2] Traditional construction method (stone yard construction) [Fig. 3] Floor plywood construction diagram [Fig. 4] Perspective view of reinforcement at the bottom of pillar is there

Claims (3)

Structural plywood (Japanese Agricultural Standards) on the lower part of the existing traditional wooden house or on the mezzanine floor
To put it all over with nails.   In place of the existing floorboard, a structural plywood (Japanese Agricultural Standard) is applied to the floor of an existing traditional wooden house with nails.   The underfloor part of the pillars built on the stone must be tied horizontally and vertically with bolts and nails.

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