JP2004225291A - Construction method of earthquake resisting wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of an earthquake resisting wall A capable of precasting the earthquake resisting wall A and, at the same time, facilitating the bar arrangement work of the precast earthquake resisting wall. <P>SOLUTION: In the construction method of the earthquake resisting wall A placed in the central part of a building, the earthquake resisting wall A to be constructed is divided into a plurality of parts in the direction of the height to embed sheath pipes 2 for inserting reinforcing bars 3a to be arranged to the earthquake resisting wall A in precast unit blocks 1, the unit blocks 1 are laminated by a suspension device, the unit blocks 1 are connected to the reinforcing bars 3a, and the inside of the sheath pipe 2 and a joint between the unit blocks are filled with grout to construct the earthquake resisting wall A. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for constructing an earthquake-resistant wall, and particularly to a technique which can be suitably used for a large-section earthquake-resistant wall in a multi-story earthquake-resistant wall structure, such as a middle-high-rise apartment house.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a shear wall in a building having a middle- and high-rise multi-story shear wall structure has a large cross section because most of the seismic force acting on the building is borne by the shear wall portion. Therefore, it is difficult to precast the entire earthquake-resistant wall, and the entire earthquake-resistant wall was constructed as cast-in-place concrete. Also, when casting concrete at the site, the concrete is typically cast using a large formwork such as a slide formwork, so that the earthquake-resistant wall precedes the surrounding parts such as floor slabs and beams. Was being constructed.
[0003]
[Problems to be solved by the invention]
However, when the shear wall is cast in advance, when the reinforcing bars are to be connected to the surrounding parts such as floor slabs and beams, the reinforcing bars must be fixed in the hardened shear wall, and mechanical joints must be installed. Was used to arrange the bar. That is, since all the reinforcements of the floor slab and the beam are of the insertion type using the mechanical joint, it takes time to connect to the surrounding parts.
[0004]
Furthermore, since the entire earthquake-resistant wall is made of cast-in-place concrete, the amount of concrete cast at the site is large, and the construction period is long. On the other hand, if the entire large-section earthquake-resistant wall was precast, the weight was too heavy to lift with a crane, and it was difficult to install the entire earthquake-resistant wall in a precast state.
[0005]
The present invention has been made in view of such a problem, and provides a method for constructing an earthquake-resistant wall, in which the earthquake-resistant wall is precast, and the rebar work of the precast earthquake-resistant wall is easy. Technical issues.
[0006]
[Means for Solving the Problems]
The present invention is a method for constructing an earthquake-resistant wall, and is configured as follows in order to solve the above technical problem.
[0007]
That is, a method of constructing a shear-resistant wall to be arranged in the center of a building, wherein each of the unit blocks that are to be constructed are divided into a plurality of pieces in the height direction and are precast, and the reinforcing bars are arranged on the earthquake-resistant wall. A sheath tube for inserting a reinforcing bar to be inserted is buried, the unit blocks are stacked by a suspension device, and each unit block is connected by a reinforcing bar to form an earthquake-resistant wall.
[0008]
Since the earthquake-resistant wall is precast as a unit block, the precast unit blocks can be easily laminated using a suspension device such as a crane, and the earthquake-resistant wall can be constructed. Therefore, it is desirable that the unit block be large enough to be lifted by a crane or the like. In addition, by precasting the earthquake-resistant wall, it is possible to reduce the amount of concrete to be cast at the site compared to the case where the earthquake-resistant wall is constructed at the site, and to improve the work efficiency. .
[0009]
Further, since the precast unit block is provided with the sheath tube in advance, a reinforcing bar to be arranged in the sheath tube can be inserted, and the work of arranging the earthquake-resistant wall can be easily performed. Here, the sheath tube is a tube having a hollow inside through which a long member such as a reinforcing bar can be inserted and removed. In addition, the unit block bears a large weight by itself, and since the unit blocks are vertically stacked, a large axial force acts on the joint surface between the unit blocks due to its own weight. The strength of the joint is improved.
[0010]
Further, in the method for constructing an earthquake-resistant wall according to the present invention, it is preferable that after stacking the unit blocks, a reinforcing bar is inserted into the sheath tube and arranged. After stacking the unit blocks, reinforcing bars arranged from above are inserted into the sheath tubes of the plurality of unit blocks and arranged. Since this rebar arrangement work only needs to insert a rebar into the sheath tube, the work is easy, and the labor and time required for the operation can be reduced as compared with a conventional mechanical joint. .
[0011]
In addition, the rebar arranged does not only act as a vertical main reinforcing bar of the shear wall, but also acts as a connecting member between the unit blocks. Therefore, there is no need to provide a separate connecting member for connecting the unit blocks, which is economical. In other words, the precast unit blocks are firmly connected to each other by the action of the reinforcing bar inserted into the sheath tube and the axial force due to the weight of the unit blocks.
[0012]
Further, in the method for constructing an earthquake-resistant wall of the present invention, after pre-installing a reinforcing bar to be arranged on the earthquake-resistant wall, the unit blocks may be stacked while inserting the reinforcing bar into the sheath pipe of the unit block. .
[0013]
According to the above configuration, as in the case where the reinforcing steel is inserted into the sheath pipe after the unit blocks are stacked as described above, the work of arranging the earthquake-resistant wall can be facilitated and the amount of concrete poured on site can be reduced. It is possible. Further, since the earthquake-resistant wall is divided and precast as a unit block, it can be lifted by using a suspension device, thereby improving work efficiency. In addition, the connection between the unit blocks is firmly connected by the reinforcing bars arranged on the earthquake-resistant wall and the axial force due to the own weight of the unit block itself. In other words, when constructing the earthquake-resistant wall, the same effect can be obtained even if the order of the unit block laminating step and the reinforcing bar arranging work step is changed, so that the order suitable according to the situation at the site etc. You just have to do the construction.
[0014]
Furthermore, in the present invention, it is desirable that after inserting a reinforcing bar into the sheath tube, a grout material is filled in the joint portion of the joint surface between the laminated unit blocks and in the sheath tube. Here, the grout material is an injecting material in which cement is a main material, and examples thereof include cement paste and mortar. By filling the grout material into the joints of the joint surfaces of the laminated unit blocks and the sheath tube, the joints of the unit blocks and the rebars arranged can be securely fixed, and as a whole earthquake-resistant wall It is possible to integrate them.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment is a high-rise apartment building having a multi-story three-dimensional earthquake-resistant wall structure, and the height of this house is 100 m or more. In the middle- and high-rise multi-story three-dimensional earthquake-resistant wall structure as in the present embodiment, a structure in which the earthquake-resistant wall is arranged intensively on a part of the building plane and most of the seismic force acting on the building is borne by the earthquake-resistant wall. Used. Therefore, the wall thickness of the earthquake-resistant wall becomes very large, and its weight also becomes large. The earthquake-resistant wall according to the present embodiment has a wall thickness of 1 m and a weight per floor of about 50 tons.
[0016]
On the other hand, in this multi-story three-dimensional earthquake-resistant wall structure, since the earthquake-resistant wall bears most of the seismic force of the building, it is possible to reduce the size of the frame other than the earthquake-resistant wall. Therefore, it is possible to reduce the frame cost of the whole building and to secure a wide space inside the building. For example, it can be suitably used for an office requiring an integrated space and an apartment house requiring a large pillar-free living space.
[0017]
FIG. 1 is a reference floor plan view of a high-rise apartment building according to the present embodiment. A dwelling unit B is arranged along the outer wall side of the building, and a substantially L-shaped portion of the earthquake-resistant wall A is arranged at the center of the building. FIG. 2 is a schematic plan view showing the cross-sectional shape of the substantially L-shaped earthquake-resistant wall A, and FIG. 3 is a partial schematic side view of the earthquake-resistant wall. This side view is a diagram showing a part of an arbitrary portion from the Nth floor FL to the (N + 1) th floor FL. As shown in FIG. 3, the earthquake-resistant wall A is divided into five in the height direction on the first floor portion, and a plurality of unit blocks 1 (11, 12, 13, 14) which are precast and a rear block are provided. It is composed of a striking portion 15. This division may be performed so that the precast unit block 1 can be lifted by the suspension device. If there is a problem in the loading step or the like, the division may be performed more finely.
[0018]
A sheath tube 2 is embedded in the precast unit block 1, and a reinforcing bar serving as a vertical main reinforcing bar 3a is arranged inside the sheath tube 2. The sheath tube 2 is a pipe made of thin sheet iron and having a circular cross section. The inside of the sheath tube 2 is hollow, and the reinforcing bar can be arranged by inserting the reinforcing bar 3 into the inside. However, when the reinforcing bar 3 is inserted into the sheath tube 2, a gap is formed between the sheath tube 2 and the reinforcing bar 3. Therefore, a grout material is filled between the sheath tube 2 and the reinforcing bar 3, and the reinforcing bar is securely fixed inside the sheath tube. Further, the joint portion of the joint surface 1a between the unit blocks 1 is also filled with a grout material to securely fix the joint surface 1a. In the present embodiment, a high-strength mortar is used as a grout material to secure strength.
[0019]
Next, a method for constructing the earthquake-resistant wall A according to the present embodiment will be described.
(Construction method 1)
The seismic wall A to be constructed is transported and divided into a plurality of blocks in consideration of lifting by a suspension device. Then, the divided earthquake-resistant wall is pre-constructed in a factory or the like as a unit block 1 (precast). At this time, the sheath tube 2 for inserting the vertical main reinforcement 3a of the earthquake-resistant wall A is provided in advance. Further, the horizontal reinforcing bars 3b of the earthquake-resistant wall A and the width stopping bars 3c connecting the vertical main reinforcing bars 3a are not divided by dividing the earthquake-resistant wall A in the height direction, and thus are precast in a state where they are arranged in advance.
[0020]
Using a crane or the like at the site, the precast unit blocks 11 are arranged at predetermined positions. Then, the unit block 12 to be the next layer is stacked on the unit block 11. At this time, the unit blocks 1 must be laminated so that the position of the sheath tube 2 coincides with the joint surface 1a. This lamination is repeated until the unit block 14 is laminated.
[0021]
After all the unit blocks 1 are laminated, the main vertical bars 3a are arranged. That is, the main vertical bar 3a is inserted into the sheath tube 2 embedded in the unit block 1 from above. As described above, since the bar arrangement work only involves inserting the main vertical bar 3a into the hollow portion of the sheath tube 2, the work can be easily performed. When all the vertical main reinforcements 3a are inserted into the sheath tube 2, the grout material is filled into the gap between the sheath tube 2 and the vertical main reinforcements 3a and the joints of the joint surfaces 1a between the unit blocks 1. Thereby, the joint surface 1a of the unit blocks 1 and the reinforcing bar 3a in the sheath tube 2 are securely fixed. Thereafter, concrete is poured into the post-cast portion 15 above the unit blocks 13 and 14. The earthquake-resistant wall A constructed in this manner is an integrated earthquake-resistant wall A because the unit blocks 1 are connected to each other and the unit block 1 is connected to the post-cast portion 15.
[0022]
(Construction method 2)
The construction method 2 is the same as the construction method 1 in the step of precasting as the unit block 1, but the order of the bar arrangement work process of the vertical main reinforcement 3 a and the lamination process of the unit block 1 is different. First, similarly to the construction method 1, the earthquake-resistant wall A is precast as a plurality of unit blocks 1. After that, the vertical main reinforcement 3a of the earthquake-resistant wall A is pre-constructed before the unit blocks 1 are arranged. Next, the unit block 11 is arranged at a predetermined position using a suspension device while inserting the vertical main reinforcing bar 3a into the sheath tube 2 of the unit block 11.
[0023]
In the same manner as in the unit block 11, the unit blocks 12, 13, and 14 are stacked while inserting the main vertical bar 3a into the sheath tube. After all the unit blocks 1 are stacked, the grout material is filled into the joint portions of the joint surfaces 1a of the unit blocks and the gap between the sheath tube 2 and the vertical main reinforcement 3a, as in the construction method 1. Thus, similarly to the construction method 1, the integrated earthquake-resistant wall A can be constructed.
[0024]
In the earthquake-resistant wall A constructed as described above, the vertical main reinforcement 3a serves as a connecting member between the unit blocks 1. Therefore, there is no need to provide a new connecting member for connecting the unit blocks 1 to each other, which is efficient and economical. In addition, since a large axial force acts on the joint surface 1a between the unit blocks 1 due to the weight of the unit block 1, the joint surface 1a between the unit blocks 1 is strongly joined together with the vertical main bar 3a. Can be. Therefore, the earthquake-resistant wall A integrated as a whole can be obtained.
[0025]
【The invention's effect】
As described above, according to the present invention, most of the earthquake-resistant wall can be precast, the amount of concrete cast at the site can be reduced, the work efficiency can be improved, and the construction period can be significantly shortened. be able to. Further, since the precast unit blocks can be lifted by the suspension device, the working efficiency can be further improved. In addition, when precasting, a sheath tube for inserting reinforcing steel bars is provided in advance and precasting is performed, so by precasting part of the earthquake-resistant wall, there is no hindrance to reinforcing work The bar arrangement work can be easily performed.
[Brief description of the drawings]
FIG. 1 is a reference floor plan view of a high-rise apartment building according to the present embodiment.
FIG. 2 is a plan view illustrating a cross-sectional shape of the earthquake-resistant wall according to the present embodiment.
FIG. 3 is a schematic side view showing a part of the earthquake-resistant wall according to the present embodiment.
[Explanation of symbols]
1 (11, 12, 13, 14) Unit block 15 Rear hitting part 2 Sheath tube 3a Vertical main reinforcing bar 3b Horizontal reinforcing bar 3c Retaining bar A Shear wall B Residential unit

Claims (4)

A method of constructing an earthquake-resistant wall arranged in the center of a building,
A sheath pipe for inserting a reinforcing bar to be arranged on the earthquake-resistant wall is buried in each of the precast unit blocks that are divided into a plurality of the earthquake-resistant walls to be constructed in the height direction, and the unit block is A method for constructing an earthquake-resistant wall, comprising stacking by a suspension device and connecting each unit block with a reinforcing bar to form an earthquake-resistant wall. The method according to claim 1, wherein after the unit blocks are stacked, a reinforcing bar is inserted into the sheath tube and arranged. The construction of the earthquake-resistant wall according to claim 1, wherein after the reinforcement to be arranged on the earthquake-resistant wall is pre-constructed, the unit blocks are laminated while inserting the reinforcement into the sheath pipe of the unit block. Method. The earthquake-resistant wall according to any one of claims 1 to 3, wherein a grout material is filled into the joint portion between the unit blocks and the sheath tube after inserting a reinforcing bar into the sheath tube. Construction method.

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