JP4152328B2 - Wall type reinforced concrete structure - Google Patents

Description

  The present invention belongs to the technical field of a wall-type reinforced concrete structure which is composed of a wall plate and a floor plate without a column and a beam.

  There are various types of wall-type reinforced concrete structures that are composed of wall plates and floor plates without columns and beams (see, for example, Patent Document 1).

  The wall-type reinforced concrete structure disclosed in Patent Document 1 has no pillars and beams by increasing the strength (earthquake resistance) by devising the reinforcement of the rebar rods provided to construct the wall panels and floor boards. A wall-type reinforced concrete structure is realized (in particular, refer to claim 1). However, this wall-type reinforced concrete structure uses a concrete having approximately the same strength as the concrete used for the wall plate portion and the floor plate portion at the joint portion between the wall plate and the floor plate (wall floor joint portion). I'm just there.

Japanese Patent Laid-Open No. 11-81450

  In general, the joint between the wall plate and the floor plate of a wall-type reinforced concrete structure (wall-floor joint) is designed in comparison with the column beam joint of a reinforced concrete structure using columns and beams. Is uniformly small. For this reason, it is difficult to sufficiently fix the floor main bars arranged through the wall-floor joints, and the end of the floor main bars may come out of the wall-floor joints when subjected to seismic force. There was a problem that the required large proof stress could not be demonstrated in the long term. In addition, it is difficult to establish a shear design for the wall-floor joint, and there is a risk that the wall-floor joint will crack and break when subjected to seismic force. There was a problem that I could not. Therefore, in order to solve these problems, the following methods can be considered.

1) The wall-floor joint is reinforced by increasing the wall thickness of the wall board or floor board.
2) Reinforce the wall-floor joint by providing a haunch at the wall-floor joint or applying complex reinforcement.
3) Reduce the stress generated in the wall-floor joint by reducing the span of the floorboard or limiting the number of floors of the structure.

  However, according to the methods listed in the above 1) to 3), although the above problems are solved, there is a new problem that the cost is high, the workability is poor, and the degree of freedom in designing the room space and the building size is reduced. Will occur.

  The object of the present invention is to provide a long-term required large-scale even when subjected to seismic force by devising the joint (wall-floor joint) between the wall plate and floor plate of a wall-type reinforced concrete structure where stress is concentrated. The objective is to provide a wall-type reinforced concrete structure that is capable of exhibiting proof stress, is excellent in workability and economy in a simple frame form, and can improve the degree of design freedom for the living room space and the building scale.

  As means for solving the above-described problems of the prior art, the wall-type reinforced concrete structure according to the invention described in claim 1 is composed of a wall plate 1 and a floor plate 2 as shown in FIGS. In the wall-type reinforced concrete structure 10 to be made, high-strength concrete is placed at the joint portion 3 between the wall plate 1 and the floor plate 2 so that the wall plate 1 and the floor plate 2 are integrally coupled. Features.

  The invention described in claim 2 is the wall-type reinforced concrete structure described in claim 1, wherein the high-strength concrete has a strength twice or more than the strength of the concrete used for the wall plate 1 and the floor plate 2. And

  The invention described in claim 3 is the wall-type reinforced concrete structure described in claim 1 or 2, wherein the high-strength concrete is reinforced by being mixed with metallic or organic / inorganic short fibers. And

  According to a fourth aspect of the present invention, in the wall-type reinforced concrete structure according to any one of the first to third aspects, the wall plate 1 is provided in an arrangement parallel to the floor plate 2 only in one direction. It is characterized by that.

  According to a fifth aspect of the present invention, in the wall-type reinforced concrete structure according to any one of the first to fourth aspects, a prestress is introduced into the floor board 1 to form a long-span floor board, or a truss It is characterized by a long-span floor board made of precast concrete reinforced with streaks.

According to the wall-type reinforced concrete structure according to the present invention, a higher strength concrete than the concrete used for the wall plate 1 and the floor plate 2 is used for the joint portion (wall floor joint portion) 3 of the wall plate 1 and the floor plate 2. As a result, the strength and shear strength of the wall-floor joint 3 where stress is concentrated are greatly improved, and the following effects are obtained.
I) It is possible to sufficiently fix the slab bars (floor main bars) of the floorboards that are arranged through the wall-floor joints 3. Therefore, even when subjected to seismic force, there is no possibility that the end of the slab bar will come out of the wall-floor joint 3, and the required large proof stress can be exhibited in the long term.
II) The shear design of the wall-floor joint 3 can be easily established. Therefore, even if it receives an earthquake force, there is no possibility that the wall-floor joint 3 is cracked and broken, and the required large proof stress can be exhibited in the long term.
III) It is not necessary to increase the thickness of the wall plate 1 or the floor plate 2 to increase the strength, and it is not necessary to provide a haunch at the wall-floor joint portion 3 or to provide complicated reinforcement. Therefore, it can be implemented in a simple frame format, and is excellent in workability and economy.
IV) There is no need to devise any means to reduce the stress generated at the wall-floor joint 3 by reducing the span of the floorboard 2 or limiting the number of floors of the structure. Can be achieved. Further, it is not necessary to dispose a seismic reinforcing wall plate in a direction perpendicular to the wall plate 1. Therefore, the design freedom with respect to the living room space and the building scale can be improved.
V) Since the high-strength concrete that is required for the wall-floor joint 3 is not necessary for the wallboard 1 and the floorboard 2, it is extremely reasonable to use high-strength concrete only for the wall-floor joint 3. And economical.

1 and 2 show an outline of an implementation of a wall-type reinforced concrete structure according to claim 1.
The wall-type reinforced concrete structure 10 includes a wall plate 1 and a floor plate 2, and high-strength concrete is placed in a joint portion (hereinafter referred to as a wall-floor joint portion) 3 between the wall plate 1 and the floor plate 2. Thus, the wall plate 1 and the floor plate 2 are integrally connected (invention of claim 1). Incidentally, the wall-type reinforced concrete structure 10 of the illustrated example is composed of a reinforced concrete wall board 1 arranged in the vertical direction and a reinforced concrete floor board 2 arranged in the horizontal direction, and the ground 7 of the flat slab wall type reinforced concrete structure 10. It shows a multi-storey apartment.

As an example, the wall plate 1 is about 200 to 400 mm in which a concrete having a normal strength (about 180 kgf / cm ² ) is placed in a form 5 containing a wall reinforcing bar made up of main and band bars. It is implemented with a relatively thin width dimension. As an example, the floor board 2 is made by placing concrete with a normal strength (about 180 kgf / cm ² ) in a form 5 containing a floor reinforcing bar made up of main and ribs, and having a strength of about 200 to 400 mm. It is implemented with a relatively thin width.

  In the case of the illustrated example, the portion where the high-strength concrete is placed, that is, the wall-to-floor joint portion 3 (the meshed portion in FIG. 2) is the intersection between the wall plate 1 and the floor plate 2 and the wall plate 1 in the vicinity thereof. And a cross-sectional shape including a part of the floor board 2 (a length of about 150 mm from each base), but is not limited thereto. The thickness of the wall plate 1 or the floor plate 2 and the strength of the reinforcing bars used for the wall plate 1 or the concrete strength required according to the diameter of the reinforcing bars are satisfied. It can also be carried out by placing strong concrete. Moreover, it can also be carried out by placing high-strength concrete in a portion including the wall plate 1 and an arbitrary portion of the floor plate 2 at the intersection 3. Incidentally, when placing the high-strength concrete in the wall-floor joint 3, a partition material such as a metal lath or punching metal is slabded in order to partition from the normal-strength concrete cast on the wall plate 1 and floor plate 2. This is done by cutting to a thickness and binding and embedding it in the slab muscle at the joining position. The partition material is not limited to the embedded type, and may be implemented using an air fence that can be removed after the concrete is hardened.

The high-strength concrete cast in the wall-floor joint 3 preferably has a (compression) strength at least twice as high as the concrete used for the wall plate 1 and the floor plate 2 (claim 2). Invention). Specifically, high-strength concrete of about 270 to 600 kgf / cm ² is used for the wall-floor joint 3. The high-strength concrete may be reinforced by mixing metal or organic / inorganic short fibers in order to further improve the concrete strength (the invention according to claim 3).

  According to the wall-type reinforced concrete structure 10 having the above-described configuration, the strength and shear strength of the wall-floor joint 3 where stress is concentrated are dramatically improved by placing the high-strength concrete on the wall-floor joint 3. it can. Therefore, it is possible to sufficiently fix the slab bars (floor main bars) of the floorboards that are arranged through the wall-floor joints 3, and even when subjected to seismic force, the ends of the floor main bars are walls. There is no risk of slipping out of the floor joint 3, and the required great strength can be exhibited in the long term. Further, the shear design of the wall-floor joint 3 can be easily established, and even when subjected to seismic force, there is no risk of the wall-floor joint 3 being cracked and broken, and it is necessary for a long term. Exhibits great strength. Furthermore, it is not necessary to increase the wall thickness of the wall plate 1 or the floor plate 2, and it is not necessary to provide a haunch at the wall-floor joint portion 3 or to provide complicated reinforcement. Therefore, it can be implemented in a simple frame format and is excellent in workability and economy.

  Further, according to the wall-type reinforced concrete structure 10, it is absolutely necessary to devise measures to reduce the stress generated in the wall-floor joint portion 3 by reducing the span of the floor plate 2 or limiting the number of floors of the structure. Moreover, since the strength and shear strength of the wall-floor joint 3 can be dramatically improved, the span of the floor plate 2 can be increased and the structure can be increased in height. Further, it is not necessary to dispose a seismic reinforcing wall plate in a direction perpendicular to the wall plate 1, and the wall plate 1 can be provided in parallel with the floor plate 2 only in one direction. Described invention).

  FIG. 3 shows a wall-type reinforced concrete structure 10 to which a long-spanned floor board 2 is applied. In the illustrated example, in order to apply a floor span 2 having a long span safely and reliably, a PC steel material 4 is disposed on the floor plate 2 and prestress is introduced. In addition, the said PC steel material 4 can also be arrange | positioned and implemented ranging over the span of the floor board 2, as shown in FIG. Further, in order to apply the long-spanned floor board 2 safely and reliably, it can be carried out with a precast concrete floor board (not shown) reinforced with truss bars or the like instead of introducing the pre-stress. Described invention).

  Although the embodiments have been described with reference to the drawings, the present invention is not limited to the illustrated examples and includes a range of design changes and application variations that are usually made by those skilled in the art without departing from the technical idea thereof. I will mention that just in case. For example, the wall-type reinforced concrete structure 10 does not need to be provided with equivalent high-strength concrete at all the wall floor joints 3. The member stress due to the external force generated in the wall plate 1 and the floor plate 2 is not uniform, and is larger as the wall plate 1 and the floor plate 2 in the lower floor and is smaller as the wall plate 1 and the floor board 2 in the upper floor. Therefore, high-strength concrete having a strength satisfying the minimum required structural design according to each level and installation site may be placed.

  Moreover, although the span of the floor board 2 of the wall-type reinforced concrete structure 10 is implemented with the same space | interval, as shown in FIG. 1, it is not limited to this. Since the shear (cross-section) design of the wall floor joint 3 can be easily made by adjusting the strength of the high-strength concrete placed on the wall floor joint 3, as shown in FIGS. The wall-type reinforced concrete structure 10 rich in variations combining long spans can be realized.

It is the perspective view which showed roughly the frame format of the wall-type reinforced concrete structure which concerns on this invention. It is the front view which expanded and showed the code | symbol A part of FIG. It is the front view which showed the floor board made long span. It is the front view which showed the floor board made long span. AD is the schematic which showed the variation of the wall-type reinforced concrete structure which concerns on this invention, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wall board 2 Floor board 3 Wall floor joint part 4 PC steel material 5 Formwork 10 Wall-type reinforced concrete structure

Claims (5)

  In a wall-type reinforced concrete structure composed of a wall board and a floor board, high-strength concrete is placed at the joint between the wall board and the floor board so that the wall board and the floor board are integrally coupled. A wall-type reinforced concrete structure.   2. The wall-type reinforced concrete structure according to claim 1, wherein the high-strength concrete has a strength twice or more than that of the concrete used for the wall board and the floor board.   The wall-type reinforced concrete structure according to claim 1 or 2, wherein the high-strength concrete is reinforced by mixing metal-based or organic / inorganic short fibers.   The wall-type reinforced concrete structure according to any one of claims 1 to 3, wherein the wall plate is installed in an arrangement parallel to the floor plate only in one direction.   The floor board is a long-span floor board by introducing pre-stress, or a long-span floor board by precast concrete reinforced with truss bars or the like. The wall-type reinforced concrete structure described in any one.

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