JPH0711719A - Precast block for aseismatic wall - Google Patents

Abstract

PURPOSE:To easily constitute an aseismatic wall concerning a column-wall integral type precast block for the aseismatic wall, to lessen joint parts and cast-in-place concrete placing parts and to shorten a construction period. CONSTITUTION:Column body parts 2, 2 and a wall body part 3 between them are integrally moulded and piled up, and the column body parts 2 and the wall body part 3 are respectively connected by a reinforcing material. It is possible to thicken an upper part of the column body part 3 in a beam shape. It is also possible to form a clearance for filling floor concrete between the wall body parts 3, 3 of upper and lower blocks at the time of piling them up, to provide a projection for a cotter on the lower edge of the wall body part 3 and to project a tie rod on the upper end of the wall body part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast block for an earthquake resistant wall in a multi-story building.

[0002]

2. Description of the Related Art Conventionally, when a precast concrete wall is used as an earthquake-resistant wall in a multi-story building, the pillar is made of cast-in-place concrete, and the rebar protruding from the wall is formed in it. It is common to embed them to integrate the pillars and walls, but this conventional technology is not only structurally unclear in many points, but the precasting of members is not sufficient, and the connection parts and Since there are many cast-in-place concrete parts, the number of on-site works increases and the construction period becomes long.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a column / wall integrated type precast block for seismic wall which can solve the problems of the prior art.

[0004]

The basic structural feature of the precast block for earthquake-resistant walls of the present invention is that a plurality of pillars and the wall between the pillars are integrally molded with concrete and stacked to form a pillar. The point is that the wall parts are connected to each other by muscles.

In the seismic wall precast block of the present invention, the upper edge portion of the wall portion may be thickened like a beam,
Further, the lower end of the wall body portion may be located above the lower end of the pillar body portion, and when stacked, a gap for floor concrete filling may be formed between the wall body portions of the upper and lower blocks. A projection for a cotter may be provided at the lower end of the intermediate portion in the span direction of the wall body portion, or a connecting line may be projected at the upper end of the wall body portion.

[0006]

DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of a precast block for earthquake-resistant walls (hereinafter simply referred to as a block) of the present invention. The block 1 in FIG. 1 is a pillar body portion 2 and a wall body portion therebetween. 3 is integrally molded with concrete, and the height of the pillar portion 2 is equal to the floor height.

The lower end of the wall body portion 3 of the block 1 is located above the lower end of the column body portion 2, and when the blocks 1 are stacked, a gap is formed between the wall body portions 3 and 3 of the upper and lower blocks 1. The floor concrete is filled in this gap.

Numerals 4 and 5 are PC steel material insertion holes provided respectively in the column body portion 2 and the wall body portion 3. In the case of the block 1 shown in the figure, the column body portion 2 and the wall body portion 3 of the stacked blocks 1 are Although they are connected to each other by the tension and fixation of the PC steel material, the column body portion 2 and the wall body portion 3 may be joined together by a reinforcing bar, and one of the column body portion 2 and the wall body portion 3 is made of PC steel material. May be connected with each other, and the other may be connected with a reinforcing bar, or these may be used together. When connecting by a reinforcing bar, a reinforcing bar and a sleeve for connecting the reinforcing bar are embedded in the block 1 in advance. Of course.

The block 1 shown in the figure has two pillars 2,
Although the wall body portion 3 has one span, the wall body portion 3 may have two spans with three column body portions 2.

The upper portion of the wall portion 3 is provided with reinforcement similar to that of a beam, but this portion may be thickened to form the beam-shaped portion 13 like a block shown in FIG.

When the wall portion 3 has two spans, or 1
If the span or floor height is large even if the span is large, if the entire floor height is integrally molded, the bulk and weight will be large, and transportation will be difficult. Therefore, as shown in FIG. It is preferable to divide into a plurality of stages, stack them on site and integrate them with PC steel material.

In FIGS. 3 and 4 showing one mode of constructing an earthquake-resistant wall using the block of the present invention, 1'is a block, 2'is a column part, 3'is a wall part, and a wall Body part 3 '
The lower end of is located above the lower end of the column body 2 ', and when stacked, a gap 6 for filling floor concrete is formed between the wall bodies 3'and 3'of the upper and lower blocks 1'. Further, a projection 7 for a cotter is provided at the lower end of the intermediate portion in the span direction of the wall portion 3 '.

Reference numeral 8 is a columnar portion 2'of the stacked blocks 1 '.
Is a PC steel material for connecting the steel bars, 9 is a reinforcing bar for connecting the wall body parts 3 ′, 10 is a sleeve for connecting the reinforcing bars 9, and
Reference numeral 11 indicates a precast floor slab, and 12 indicates cast-in-place floor concrete.

A block 1'having a height equal to the floor height is sequentially
They are stacked, and these are integrally joined by the PC steel material 8 and the reinforcing bar 9 to form a wall, and the floor slabs 11 are installed side by side between the upper ends of the wall bodies 3'of the blocks 1'of the opposite walls. ,
When the floor concrete 12 is placed on it to form the floor, the gap 6 between the wall portions 3'and 3'of the upper and lower blocks 1'is formed.
Is filled with floor concrete 12, and blocks 1'on the top and bottom
Are more firmly coupled, and the projection 7 increases the horizontal shear resistance of the joint portion of the block 1 ', and the seismic effect is improved.

In FIG. 5, reference numeral 14 is a connecting bar projecting at appropriate intervals at a position not hitting the projection 7 on the upper end of the wall portion of the block, and the connecting bar is the floor concrete 1
It is embedded in 2 and serves to strengthen the bond between blocks.

[0016]

The precast block for earthquake-resistant walls of the present invention is as described above, and the following effects can be expected. That is, the earthquake-resistant wall can be easily constructed simply by stacking and connecting the column body portion and the wall body portion with the reinforcing members. Fewer joints (horizontal joints only) and less cast-in-place concrete, and therefore less work on site, improving work efficiency and shortening the construction period. If the upper portion of the wall body is thickened in the shape of a beam, it becomes a block in which columns, beams and walls are integrated, and a strong earthquake-resistant wall can be easily constructed. By positioning the lower end of the wall part above the lower end of the column part so that a gap for filling the floor concrete is formed between the wall parts of the upper and lower blocks when stacked, the blocks are firmly connected to each other. Further, if a projection for a cotter is provided at the lower end of the intermediate portion in the span direction of the wall body portion, or if a connecting line is made to project at the upper end of the wall body portion, the mutual connection of the blocks becomes stronger, The horizontal shear resistance of the block joint increases and the seismic effect improves.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of a block of the present invention.

FIG. 2 is a perspective view when the block shown in FIG. 1 is divided into two stages.

FIG. 3 is an explanatory diagram of an aspect of constructing an earthquake-resistant wall using the block of the present invention.

FIG. 4 is an enlarged sectional view taken along line AA of FIG.

FIG. 5 is a cross-sectional view showing a state of a joint portion of another block of the present invention.

[Explanation of symbols]

1, 1 ': block, 2, 2': column part, 3, 3 ': wall part, 4,5: PC steel material insertion hole, 6: gap, 7: protrusion,
8: PC steel material, 9: Reinforcing bar, 10: Sleeve, 11: Floor slab, 12: Floor concrete, 13: Beam type part, 14: Connecting bar.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Sakata 2-5-8-110 Hanasaki, Narashino City, Chiba Prefecture (72) Inventor Masao Komura 4-22-32, Nakai, Nerima-ku, Tokyo

Claims (5)

[Claims] 1. A plurality of pillars and a wall between the pillars are integrally formed of concrete, and the pillars and the wall are connected to each other with a reinforcing member. A precast block for earthquake resistant walls. 2. The precast block for an earthquake resistant wall according to claim 1, wherein the upper portion of the wall body portion is thickened like a beam. 3. A floor concrete filling gap is formed between the wall portions of the upper and lower blocks when the lower end of the wall portion is positioned above the lower end of the column portion so that the gap is formed between the wall portions of the upper and lower blocks. The precast block for earthquake-resistant walls according to claim 1 or claim 2. 4. The precast block for seismic wall according to claim 3, wherein a projection for a cotter is provided at a lower end of a span direction intermediate portion of the wall body portion. 5. The precast block for an earthquake resistant wall according to claim 4, wherein a connecting line is projected at an upper end of the wall body portion.