JPH0941520A - Method of earthquake-resisting reinforcing construction of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the execution of works simply and quickly without requiring a large-sized working machine, etc., in a building, to eliminate the need for even large working space in the execution of works to an existing building, to prevent even the generation of noises and vibrations and to enable reinforcing operation as a working state is left as it is. SOLUTION: Precast concrete boards 1 using light-weight concrete are built among the frameworks of a building as divided boards in an extent that the divided boards are carried by man-power, but a plurality of the precast concrete boards 1 are laminated and constructed so as to form a reinforcing wall 10. Reinforcements 4 connecting the reinforcing wall 10 and a building body are incorporated into recessed sections 3 for cotters formed to these precast concrete boards 1 at that time, and the recessed sections 3 for the cotters are filled with a grout material 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a seismic retrofitting method for a building that compensates for the lack of seismic resistance of an existing building.

[0002]

2. Description of the Related Art Conventionally, as a method of reinforcing the seismic resistance of an existing building, a method of constructing a seismic wall between the building frames of columns and beams by in-situ construction or adding steel plates to the outer periphery of an existing reinforced concrete column has been used. , Steel plate winding method that integrates this by welding, FRP winding method that winds fiber reinforced material consisting of high-strength fiber such as glass fiber or carbon fiber around the surface of existing reinforced concrete column, or steel frame brace between frames There is a method of inserting.

Of these, the construction method for adding the earthquake resistant wall is
After placing reinforcing bars between the frames and installing the formwork, cast in-place concrete.

[0004]

[Problems to be Solved by the Invention] The construction method for adding earthquake-resistant walls is a wet construction method for placing cast-in-place concrete, and if the work for rebar work and concrete placement and the curing period for concrete hardening are secured. It requires labor and time, and it requires a large work space, so it is difficult to work in a working state in a building such as an office building, and the function as an office building is impaired during construction. Be done.

Further, in the method of inserting the steel brace into the frame, the weight of the members forming the brace becomes large, and a heavy machine for work is required. As a result, it is necessary to monopolize the building for work. Noise and vibration are also generated, and the function of the office building is impaired during construction.

The object of the present invention is to solve the inconveniences of the above-mentioned conventional examples, and it is possible to construct easily and quickly without the need for a large working machine in a building. In the construction on an existing building, a large working space is required. It is to provide a seismic retrofitting method for buildings that is unnecessary, does not generate noise and vibration, and can be reinforced during work.

[0007]

In order to achieve the above-mentioned object, the present invention firstly builds a precast concrete board using lightweight concrete between the frameworks of a building so that it can be manually carried. , This precast concrete board is built so that a plurality of precast concrete boards are stuck together to form a reinforcing wall, and at that time, a reinforcing bar for connecting the reinforcing wall and the building frame is built in the cotter recess formed in these precast concrete boards. And, secondly, the recess is filled with grout material. Secondly, the precast concrete plate has wall reinforcements built therein, and the reinforcing bars arranged in the recesses are reinforcing reinforcements for bending reinforcement and shear displacement reinforcement. It is what

According to the first aspect of the present invention, since it is only necessary to bring the precast concrete plate into the site and build it, there is no need to pour in-place concrete,
There is no noise or vibration, and it can be constructed by the dry construction method like the construction of the moving partition wall, and it does not hinder the work even in the construction of the existing building.

According to the second aspect of the present invention, the precast concrete plate is a precast reinforced concrete plate having wall reinforcements built therein, and the reinforcing bar arranged in the cotter recess provided in the precast concrete plate is reinforced. Bending reinforcement as well as connecting the wall and the building frame,
Sufficient strength can be obtained as a reinforcing wall by using a reinforcing bar for shear shear reinforcement.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional plan view of a reinforcing wall on which the seismic retrofitting method of the building of the present invention is implemented, FIG. 2 is a cross-sectional plan view of a precast concrete plate constituting the reinforcing wall, and FIG. 3 is a vertical front view of the same. Explaining from the structure of the precast concrete plate 1, a lightweight concrete having a specific gravity of about 1.0 to 1.5 is used, and the precast concrete plate 1 is divided into a size such that it can be easily transported by manpower and other work.

In this embodiment, the precast concrete plate 1 has wall reinforcements 2 which are shear reinforcements built therein, and a cotter recess 3 is formed on the joint surface 1a side so as to extend in the longitudinal direction.

This precast concrete board 1 is shown in FIG.
As shown in Fig. 1, it is built between columns 6 and beams 7 which are building frames. At this time, as shown in Fig. 1, two precast concrete plates 1 are superposed with their joint surfaces 1a being overlapped with each other, and an adhesive 5 To form a reinforcing wall 10 by adhering or by tightly connecting with bolts from the out-of-plane direction.

In this state, the mutual precast concrete plates 1 are combined with the recesses 3 for the cotter to form a hole. In the recesses 3 for the cotter, a beam 7 or a floor slab 8 or a pillar 6 which is a building frame is connected. The reinforcing bar 4 to be performed was built in, and the grouting material 9 made of high-strength grout mortar or the like was filled in the recess 3 for the cotter.

The reinforcing bars 4 are anchor bars for driving post-installed anchors into the columns 6, the beams 7 and the floor slabs 8 and connecting the anchors. Further, the reinforcing bars 4 are for reinforcing the bending of the precast concrete plate 1 and further for shearing displacement. Play a role as a muscle.

A plurality of precast concrete plates 1 are attached to each other to form a reinforcing wall 10 and the reinforcing walls 10 are arranged between the columns 6 and the beams 7 or between the floor slab 8 and the beams 7, which are finally constructed. , The pillar 6, the beam 7, as shown in FIG.
The space between the floor slab 8 and the like is filled with grout material 9 such as high-strength grout mortar to construct an earthquake-proof reinforced wall.

By selecting the method of joining the precast concrete boards 1 and the width of the boards, a plurality of the reinforcing walls 10 arranged in line are known slit type earthquake resistant walls (Japanese Patent Publication No. 45-24104 and Japanese Patent Publication No. 48-11135). It is also possible to use a ductile wall in which the rigidity of the reinforcing member can be changed as desired.

As another embodiment, as shown in FIG. 5, the reinforcing wall 10 can be constructed as a sleeve wall.

[0018]

As described above, according to the seismic retrofitting method for a building of the present invention, it is sufficient to carry in the precast concrete boards divided into sections that can be carried by human power to the site and build them. It is unnecessary and does not generate noise or vibration, and it can be installed by the dry method like the construction of moving partition walls, and it can be installed easily and quickly without the need for a large working machine in the building. .

Further, in construction on an existing building, a large work space is not required, noise and vibration are not generated, and reinforcement work can be performed in the working state.

In addition, the precast concrete plate has a wall reinforcement which is a shear reinforcement, and in addition to that, a cotter recess provided in the precast concrete plate sandwiches a reinforcing bar for connection with the building frame, and bends this reinforcing bar. Reinforcement,
Sufficient strength can be obtained by using reinforcing bars for shear displacement reinforcement.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a reinforcing wall in which an earthquake-proof reinforcing method for an existing building of the present invention is implemented.

FIG. 2 is a cross-sectional plan view of a precast concrete plate that constitutes a reinforcing wall.

FIG. 3 is a vertical sectional front view of a precast concrete plate that constitutes a reinforcing wall.

FIG. 4 is a front view showing an embodiment of a seismic retrofitting method for an existing building of the present invention.

FIG. 5 is a front view showing another embodiment of the seismic retrofitting method for an existing building of the present invention.

[Explanation of symbols]

 1 ... Precast concrete plate 1a ... Joining surface 2 ... Wall reinforcement 3 ... Cotter recess 4 ... Reinforcing bar 5 ... Adhesive 6 ... Pillar 7 ... Beam 8 ... Floor slab 9 ... Grout material 10 ... Reinforcement wall

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Migameo Kobayashi 2-19-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Hiroaki Nakagawa 2-19-1 Tobita, Chofu-shi, Tokyo No. Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Masaru Yamamoto ▲ Hiro ▼ No. 19-1 Tobita, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Laboratory (72) Inventor Takashi Suzuki Two Tobita, Tofu, Chofu-shi, Tokyo No. 19-1 Kashima Construction Co., Ltd. Technical Research Institute

Claims (2)

[Claims] 1. A precast concrete board made of lightweight concrete is built between the frameworks of a building so that it can be carried by human power, and the precast concrete board is constructed by laminating a plurality of precast concrete boards to form a reinforcing wall. In that case, in the recess for the cotter formed in these precast concrete plates, a reinforcing bar for connecting the reinforcing wall and the building frame is built in, and the recess is filled with grout material. Seismic reinforcement method. 2. The seismic strengthening method for a building according to claim 1, wherein the precast concrete plate has wall reinforcements built therein, and the reinforcing bars arranged in the recesses are reinforcement reinforcements for bending reinforcement and shear displacement reinforcement.