JPH0444576A - Half precast concrete shear wall structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to half precast concrete (hereinafter referred to as half P) for shear walls that are particularly effective for large structures such as nuclear power plants.
This is related to the chemical structure called Ca).

[Conventional technology]

In general construction work for reinforced concrete structures, the construction period is shortened,
By adopting the half PCa conversion method as a means of improving quality, countering labor shortages, and ensuring safety,
It has achieved great results.

As mentioned above, while half PC-a is being promoted in general construction work, there are examples of half PCa boards such as Omnia board being used for beams, slabs, walls, etc. even in large structures such as nuclear power plants. However, the above-mentioned half PCa board was merely used as a substitute for formwork, and was not treated as a structural material.

That is, in the conventional half PCa structure, as shown in FIGS. 5 and 6, the I! After using wall half PCa board as a formwork on both sides or one side of wall a and arranging vertical reinforcing bars C and horizontal reinforcing bars d inside it, concrete e is poured, and the vertical reinforcing bars C are extended at the top of wall a. It is connected to the beam concrete g or slab concrete h by the beam or slab anchor f.

Therefore, in the conventional half-PCa wall structure, the effective thickness Te as a seismic wall does not include the half-PCa plate, unless the half-PCa wall plate is provided with a slip stopper such as a slip stopper.

Because there are no load-bearing reinforcements in the wall half PCa board other than the reinforcement reinforcement, load-bearing reinforcement must be placed in the post-cast concrete part of the shear wall during on-site work, and this reinforcement work is required for nuclear power plants. In large structures such as buildings, there is a large amount of large-diameter reinforcing bars, which poses the problem of a considerable amount of work.

[Problem to be solved by the invention]

The present invention has been made in view of the above-mentioned conventional problems and has been made with the aim of improving the problems, and the wall half PCa board acts not only as a mere wall formwork but also as a structural material,
The total wall thickness is the effective wall thickness, and the stress is reliably transmitted to beams, slabs, columns, etc., and the flow of post-cast concrete placed inside the wall half PCa board is good, and the wall The purpose of the present invention is to provide a half-PCa structure of a seismic wall that achieves good integration of the A-F PCa board and post-cast concrete.

[Means to solve the problem]

In order to achieve the above-mentioned problems, the present invention includes a wall half-PCa plate in which a cotter is formed around the inner surface and load-bearing reinforcement is arranged inside, and post-cast concrete is placed inside the wall half-PCa plate.
In the post-cast concrete, there is a half-PCa shear wall structure in which U-shaped reinforcing bars are arranged that extend outward along the outer periphery of the inner surface of the wall half-PCa board, and the edge of the wall half-PCa board. A half-PCa structure of a seismic wall with a tapered surface that slopes inward, and a cotter formed on the tapered surface, and the wall PCa plate and post-cast concrete poured on the inner surface are connected by tie bars. The building is characterized by a half-precast concrete shear wall structure.

[For production]

As described above, in the present invention, the half-wall PCa board has a cotter formed around the inner surface, and load-bearing reinforcements are arranged inside in advance, so the half-wall PCa board and the post-cast concrete are surely integrated. and form a strong load-bearing wall,
Therefore, the total wall thickness including the wall half PCa plate becomes the effective wall thickness to resist earthquake force, and like the conventional half wall PCa structure, a large number of load-bearing bars with large diameters are placed in the post-cast concrete part during on-site work. This eliminates the need for wall reinforcement work on site, and significantly reduces wall reinforcement work on site.

In addition, U-shaped reinforcing bars extending outward along the periphery of the wall half PCa plate are arranged in the post-cast concrete, so stress transmission from the wall to beams, slabs, columns, etc. , load-bearing reinforcement of the wall half PCa board → load-bearing reinforcement of the wall half PCa board → post-cast concrete → U-shaped reinforcement → beams, slabs, columns, etc. are reliably transmitted.

In addition, by making the edge part of the wall half PCa board a tapered surface that slopes inward, and by forming a bumpter on the tapered surface, the flow of the post-cast concrete poured inside the wall half PCa board is improved. Good quality concrete can be obtained, and by connecting the wall half PCa board and the post-cast concrete placed on its inner surface with tie bars, good integration of the half PCa board and post-cast concrete, and the half The buckling strength of the PCa plate is enhanced.

〔Example〕

The present invention will be explained in detail below based on illustrated embodiments.

Fig. 1 is a longitudinal cross-sectional view of a seismic wall constructed using half-wall PCa boards on both sides, and Fig. 2 is a partial internal view of the half-wall PCa board.

In Figures 1 and 2, l is a shear wall, 2 is a half-wall PCa board used on both sides of the shear wall 1, and 3 is a post-cast wall half-PCa board used on both sides of the wall half-PCa board 2, which is used as a formwork on site. It is concrete.

The wall half PCa board 2 is pre-fabricated in a factory, and the wall half PCa board 2 in the illustrated example has an inwardly inclined taper formed around the entire circumference of the edge part 2a, and a predetermined taper on the edge part 2a and the inner periphery. Concave cotters 4, 4' are formed at intervals,
Load-bearing bars 5 made up of vertical reinforcing bars 5a and horizontal reinforcing bars 5b are arranged inside.

6 is embedded in the post-cast concrete 3, extends outward in the required direction along the outer walls 4' of the wall half PCa plates 2, 2 on both sides, and is adjacent to the wall half PCa plates 2. , slab 8, fixed to other members such as columns, and shear wall 1
When a U-shaped reinforcing bar transmits stress to other members, and the stress is transmitted to members around the four circumferences, the U-shaped reinforcing bar 6 is extended to all four circumferences, as shown in FIG.

9 is a tie bar used when the shear wall 1 has a large area and is constructed by adding wall half PCa boards, and is used to prevent the wall half PCa board 2 from protruding when pouring concrete 3, and also to prevent the wall half PCa board 2 from protruding. 2 and post-cast concrete 3
Good integration with wall half PC against in-plane shear forces
It works to strengthen the buckling strength of the a-plate 2. This tie bar 9 cuts the protruding portion after the post-cast concrete 8 has hardened and the form 2' has been removed.

Figure 4 shows an earthquake-resistant wall that is used when the wall thickness is thin.This earthquake-resistant wall 1' has a wall half PCa board 2 on one side and a general formwork 2' on the other side, and the area around the wall half PCa board 2. A general formwork 2 for U-shaped reinforcing bars 6' that extends outward along the outer beams 4' and is fixed to adjacent beams 7, slabs 8, columns, etc.
' side is extended within the post-cast concrete 3 to the lower part of the shear wall 1', and horizontal reinforcing bars 5b' are arranged thereto to constitute load-bearing bars 5'.

〔Effect of the invention〕

As described above, according to the present invention, the wall half PCa board has a bulge formed around the inner surface, and the load-bearing reinforcement is pre-arranged inside, so that the wall half PCa board and post-cast concrete can be reliably bonded. together constitute a strong load-bearing wall, so that the entire wall thickness, including the wall half-PCa plates, resists seismic forces. As well as effective wall thickness, the conventional wall half P
Unlike the Ca method, there is no need to place a large number of large-diameter load-bearing reinforcements in post-cast concrete sections during on-site work, and the on-site wall reinforcement work is significantly reduced.

In addition, U-shaped reinforcing bars are placed in the post-cast concrete that extend outward along the periphery of the wall half-PCa plate, so stress from the adjacent wall to beams, slabs, columns, etc. Transmission is from load bearing reinforcement of wall half PCa plate → wall half PC
It is reliably transmitted to the A-board concrete → post-cast concrete 3-placed reinforcing bars → beams, slabs, columns, etc.

In addition, the wall half PCa board has a tapered surface that slopes inward at the edge part, and by forming a constrictor on the tapered surface, the flow of post-cast concrete to the inner surface of the wall half PCa board is improved, resulting in high-quality concrete. It is possible to obtain good integration with adjacent beams, slabs, columns, etc.

In addition, by connecting the wall half PCa board and the post-cast concrete placed on its inner surface with a tie bar, it is possible to prevent the wall half PCa board from protruding when post-cast concrete is placed, and to connect the wall half PCa board and the inside wall half PCa board to the inside. Good integration with post-cast concrete and wall half P against in-plane shear forces
The buckling strength of the Ca plate is strengthened. In terms of strength and deformation performance, results can be obtained that are equivalent to or better than those achieved by single-piece reinforced concrete casting.

In addition, since the reinforcing bars are U-shaped, the U-shaped part of the reinforcing bars can be supported by beam reinforcements, slab reinforcements, column reinforcements, etc. during post-cast concrete pouring, simplifying reinforcement work.
Many other effects can be obtained.

[Brief explanation of the drawing]

Figures 1 to 4 show embodiments of the present invention; Figure 1 is a longitudinal sectional view of a seismic wall constructed using wall half PCa plates on both sides; Figure 2 is a partial inner surface of the wall half PCa plate. Figure 3 is an overall view of a wall half PCa board with U-shaped reinforcing bars extending around the four sides, and Figure 4 is an overall view of a shear wall constructed using a wall half PCa board on one side and general formwork on the other side. 5 and 6 are vertical cross-sectional views of a wall constructed using a conventional half-PCa structure, and FIG.
When using a board, Figure 6 shows a wall half PCa on one side of the wall.
This is a case where ordinary formwork is used for the board and other sides. 1.1'... Earthquake-resistant wall, 2... Wall half PCa board, 2
'...General formwork, 2a...Edge part, 3...Post-cast concrete, 4...Cotter of the edge part of the wall half PCa board, 4'...Peripheral part of the wall half PCa board Kotsuta, 5.5'... load-bearing bar, 6,6'... reinforcing bar. Figure 2

Claims (3)

[Claims] (1) A cotter is formed around the inner surface, and post-cast concrete is poured inside the wall half-precast concrete plate with load-bearing reinforcement arranged inside, and the wall half-precast concrete is placed inside the post-cast concrete. A half-precast concrete shear wall structure characterized by U-shaped reinforcing bars that extend outward along the cotter around the inner surface of the plate. (2) Claim (1) characterized in that the edge portion of the wall half precast concrete plate is formed into a tapered surface that slopes inward, and a cotter is formed on the tapered surface.
) half precast concrete structure of shear wall. (3) The half precast concrete of the shear wall according to claim 1 or 2, wherein the wall half precast concrete plate and the post-cast concrete poured on the inner surface thereof are connected by tie bars. structure.