JPH03224974A - Construction of earhquake-isolating building - Google Patents

Abstract

PURPOSE:To make construction work easier by a method in which a mat slab is formed on the bottom of pit, an earthquake isolator is set on the wall and bottom of the pit, and concrete is placed into precast concrete panels as outer form panels attached to the earthquake isolator. CONSTITUTION:The wall 2a of a pit 2 is constructed in the form of an underground constituous wall, the inside of the wall 2a is excavated, and a mat slab 2b is formed on the bottom of the pit 2. Laminated rubbers 4 are attached to the upsides of the slab 2b and the wall 2a, and PC plates 10 and 11 to be the outer form panels 3d and the mat slab 3a of the upper body 3 are attached. On the inside of the plates 10 and 11, reinforcing bars are arranged for the slab 3a, column 3b, and the outer walls 3d, inner form panels are assembled, and concrete is placed to form the slab 3a, the column 3b, and the outer walls 3d. The operations for reinforcement arranging and concreting can thus be easily attained.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a method of constructing a seismically isolated building in which a seismic isolation device such as laminated rubber is installed between a foundation frame and an upper frame. .

"Prior art and its problems" As a method of constructing a seismically isolated building in which a seismic isolation device, represented by laminated rubber, is installed between the foundation-framework and the upper frame, after the foundation frame and upper frame are constructed, It is common to use a pre-structure construction method in which laminated rubber is inserted between them, but in this case, when constructing the upper structure, a temporary jig is required to temporarily support it, and When inserting the laminated rubber, it is necessary to jack up and down the upper structure, which requires extensive construction and requires various safety measures.

For this reason, a method of installing a seismic isolation device in advance is being considered, in which laminated rubber is installed on the foundation frame and the upper frame is constructed on top of it. In addition, when constructing the upper structure, uneven loads and horizontal loads are applied to each laminated rubber, so countermeasures are essential. There is a problem that the laminated rubber may have an adverse effect.

The present invention eliminates the above-mentioned problems in the advance construction method for seismic isolation devices, simplifies the curing of seismic isolation devices, prevents unbalanced loads and horizontal loads from being applied to them, and furthermore, The purpose is to provide a construction method that can reduce negative effects on concrete.

"Means for Solving the Problems" The construction method of the present invention involves installing an upper framework in a floating state by supporting it with a seismic isolation device such as laminated rubber in a pit that is a foundation framework formed in the ground. A method for constructing a seismically isolated building, comprising: forming the wall of the pit with an underground continuous wall, and forming a pine slab on the bottom;
After installing the seismic isolation devices on the walls and bottom of the pit, precast concrete plates are attached to the seismic isolation devices, and concrete is poured inside them using the precast concrete plates as outer formwork to build the upper frame. It is characterized by forming.

"Function" The method of the present invention employs a seismic isolation device construction advance method in which the seismic isolation device is installed prior to construction of the upper structure. The seismic device is installed, and then the upper frame is constructed. When constructing the upper frame, a precast concrete board (PC board) is attached to the seismic isolation device, and the PC board is used as the outer formwork of the upper structure. In addition to forming the upper frame, the PC boards will be used as scaffolding during reinforcement work and concrete pouring work.

"Example" Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

Fig. 1 is a site plan showing a schematic configuration of the underground part of a seismically isolated building constructed by the method of this example, Fig. 2 is a sectional view of a partially enlarged room, and Fig. 3 is a plan view. This seismic isolation building has a pit 2 which is a foundation structure formed on the ground 1.
Since the upper frame 3 is supported by laminated rubber (seismic isolation device) 4, the upper frame 3 can be displaced vertically and horizontally in the event of an earthquake.

The wall surface 2a of the pit 1-2 is formed by an underground continuous wall, and the bottom surface of the pit 2 is a pine slab 2b. In addition, the code|symbol 5 is a pile provided as needed, and 6 is a reinforcing bar buried in the pine slab 2b.

On the other hand, the upper frame 3 includes pine slabs 3a and pillars 3b.

It is constructed of reinforced concrete with beams 3c and outer walls 3d, and the underground part of the upper frame 3 is supported by laminated rubber 4 attached to the inner surface of the pit 2, so that it floats above the inner surface of the pit 2. In other words, a space is provided between the outer wall 3d of the upper frame 3 and the inner surface of the pit 2 to allow for displacement during an earthquake.

To construct the seismically isolated building as described above, first, the wall surface 2a of the pit 2 is constructed as an underground continuous wall, then the inside thereof is excavated, and the pine slab 2b is formed at the bottom thereof.

Next, the top of the pine slab 2b formed above and the wall surface 2 are
By attaching the laminated rubber 4 on the laminated rubber 4 and supporting it on the laminated rubber 4, the PCClO 211 which becomes the outer formwork of the pine slab 3a of the upper frame 3 and the outer wall 3d is attached.

Then, inside these PCClO 211, the reinforcement of the pine slab 3a, the columns 3b and the outer wall 3d are arranged, and after assembling the inner form, concrete is poured to form the pine slab 3a, the columns 3b and the outer wall 3d. Although the inner formwork is dismantled after the concrete hardens, the outer formwork PCClO211 may be left as is as a waste formwork.

According to the above method, since the wall surface 2a of the pit 2 is formed as an underground continuous wall, not only is sufficient water-stopping property ensured, but also the PCClO21 which becomes the outer formwork of the upper frame 3
After installing 1, reinforcement work will be done inside it, so
PCClO2 naturally provides a secure footing, making reinforcing work easier. Further, after the PCClO 211 is attached to the laminated rubber 4, there is no need to work outside the PCClO 211, so there is less risk of damaging the laminated rubber 4 during construction, and its curing can be simplified.

In addition, since an equal load is applied to each laminated rubber 4 via the PCClO211, it becomes difficult to apply unbalanced loads or horizontal loads to the laminated rubber 4, and at the same time, there is no risk of adverse effects on young concrete, reducing the need for countermeasures. can. Furthermore, since PCClO211 is not subjected to earth pressure, it is sufficient to use a thin material that has the strength to serve as formwork and scaffolding.

Note that it is also possible to employ a seismic isolation device other than laminated rubber.

"Effects of the Invention" As explained in detail above, according to the method of the present invention, the wall surface of the pit, which is the foundation structure, is constructed as an underground continuous wall, and a pine slab is provided on the bottom surface of the pit, so that the water-tightness of the pit is improved. At the same time, we installed seismic isolation devices on the inner surface of the pit, attached PC boards that will become the outer formwork of the upper structure to these seismic isolation devices, and poured concrete inside to form the upper structure. Since I changed it to PC
The boards can be used as scaffolding, making reinforcing work for the upper frame and concrete pouring work easier, and there is no need to work outside the PC board, which could damage the seismic isolation device during construction. Since there is little fear, the curing of the seismic isolation device can be simplified, and since an equal load is applied to each seismic isolation device via the PC board, it is difficult for unbalanced loads and horizontal loads to be applied to them. It has the excellent effect of preventing adverse effects on young concrete and reducing the need for such countermeasures.

[Brief explanation of drawings]

1 to 3 show an embodiment of the method of the present invention,
Fig. 1 is a site plan showing a schematic configuration of the underground part of a seismically isolated building constructed by the method of this example, Fig. 2 is a partially enlarged sectional view of the room, and Fig. 3 is a partial plan view. . 1...ground, 2...pit, 2a...
...Wall surface, 2b... Pine slab, 3... Upper frame, 3a... Pine slab, 3b... Pillar, 3c... Beam, 3d・
...Outer wall, 4...Laminated rubber (seismic isolation R)
, 10.11... Precast concrete board.

Claims (1)

[Claims] A method for constructing a seismically isolated building in which an upper frame is floated in a pit, which is a foundation frame formed in the ground, by being supported by a seismic isolation device such as laminated rubber, the wall surface of the pit being A continuous underground wall is formed and a mat slab is formed on the bottom of the pit. After installing the seismic isolation devices on the walls and bottom of the pit, precast concrete plates are attached to the seismic isolation devices, and the precast concrete plates are removed. A method for constructing a seismically isolated building, characterized in that the upper frame is formed by pouring concrete inside the formwork.