JPS6236097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a cast-in-place concrete wall in a precast reinforced concrete frame.

In a precast reinforced concrete frame, an important issue is how to place cast-in-place concrete as an earthquake-resistant element and incorporate it into the frame.

Conventionally, the method of placing cast-in-place concrete walls on precast reinforced concrete frames is as follows:
As shown in Fig. 1, concrete e is press-fitted through a press-fit hole d provided at the bottom of a wall formwork c, which is assembled at the bottom of a precast concrete beam a and has an air vent b at the top, or as shown in Fig. 2. As shown in the figure, there is a method of pouring concrete e into a wall formwork c assembled at the bottom of a precast concrete beam a through a funnel part f provided above, but the former method is complicated, and the latter method is complicated. A corrugated portion remains, and the degree of filling of concrete in both cases is unreliable.

For this purpose, a frame member for a precast concrete beam with a channel-shaped cross section having a through hole in the bottom piece is erected at a predetermined position, beam reinforcing bars are arranged in the frame member, and then a through hole in the bottom piece of the frame member is installed. A construction method has been proposed in Japanese Patent Publication No. 14444/1983 in which wall concrete is placed at the lower part of the frame member, and the work of placing wall concrete is carried out reliably.

However, in the conventional construction method, the precast concrete beam frame member used in the construction method is substantially the same as the beam formwork,
Complicated beam reinforcement work is required, reducing construction efficiency.

The present invention was proposed in order to solve these problems, and it provides a precast concrete beam that has a concrete casting gap that penetrates in the direction of growth in the center of the width direction, and has built-in beam reinforcement. A method for constructing a cast-in-place concrete wall in a precast reinforced concrete frame, characterized in that after the precast concrete beam is erected at a predetermined position, concrete for a wall portion located below the precast concrete beam is poured through the gap. It is.

As described above, in the present invention, a precast concrete beam is used which has a concrete casting gap penetrating in the growth direction in the widthwise center part and has built-in beam reinforcement, and the beam is placed in a predetermined position. After the beam is erected, by pouring concrete through the gap provided in the beam, concrete can be easily poured into the wall formwork provided at the bottom of the beam, and as described above. By pouring concrete vertically through the gaps in the beams that penetrate in the growth direction, the wall formwork placed directly under the beams is densely filled with concrete, creating highly reliable cast-in-place concrete walls. will be constructed.

Moreover, the upper part of the wall concrete is also filled into the concrete casting cavity of the precast concrete beam, so that both the beam and the wall are joined together, and when the wall concrete is poured,
The connection between the upper part of the beam and the floor slab is also processed at the same time.

Furthermore, since the precast concrete beam has built-in beam reinforcement, there is no need to arrange beam reinforcement as in the conventional construction method, which simplifies the construction and shortens the construction period.

The present invention will be described below with reference to the illustrated embodiments.

Fig. 5 shows an embodiment of a precast concrete beam A used in the method of the present invention, in which a concrete pouring gap 1 is provided in the center of the width direction of the beam A, penetrating in the direction of formation. The opposing surface of the gap 1 is formed into a tapered surface whose width gradually decreases as it goes downward. Further, on the upper part of the beam A, connecting pieces 2 are arranged at predetermined intervals to connect the opposing surfaces with the gap 1 interposed therebetween, and on the upper surface of the connecting piece 2, a cotter 3 is provided.

Furthermore, the lower end main reinforcement 4 and most of the cost reinforcements 5 are built into the precast concrete beam A, and the upper end main reinforcement 6 is connected between the projecting parts of the top surface of the beam of the cost reinforcement 5.

Then, the beam A was suspended horizontally between adjacent precast concrete columns B, and concrete D was poured into the wall form C assembled directly under the beam A through the gap 1 of the beam A. , a cast-in-place concrete wall E integrated with the beam A and column B is constructed.

In the figure, 7 is a wall reinforcement, and 8 is a column main reinforcement.

At the same time, concrete D' is also poured between the precast concrete deck slab F, which is bridged between the beams A, and the top surface of the beam A.
This is to join the two at the same time.

In the figure, numeral 10 is a slat provided on the floor slab F, and numeral 11 is a slab line.

FIG. 6 shows another embodiment of the present invention, in which the beam A
A precast concrete wall slab G is installed directly below the wall slab G, and partial formwork is placed on both sides of the gap between the wall slabs G and the gaps between the wall slab G and the column B, beam A, and floor slab. are assembled, concrete is poured through the concrete casting gaps provided in the beam A, and concrete D'' is filled into each gap.

In the figure, D indicates concrete poured between the adjacent beams A at the capital of the column B, and 12 indicates a cotter provided on the wall slab G.

Figure 7 shows another embodiment of the precast concrete beam A, in which the _opposing surfaces are _formed into tapered surfaces that gradually increase in width as they go downward. , connecting blocks 14 having cotters 13 on their top surfaces at predetermined intervals.
interposed between the same block 14 and each of the above-mentioned members A ₁ and A ₂
and are connected by a connecting steel rod 15 to form a precast concrete beam A having a concrete casting cavity 1 in the widthwise center portion penetrating in the growth direction.

Reference numeral 16 in the figure indicates a recess provided in each of the members A ₁ and A ₂ , and mortar 17 is placed in the recess 16 so as to cover the end of the connecting steel rod 15 protruding into the recess 16 . It is to be filled.

Further, as shown in Fig. 8, a precast concrete beam A having a rectangular cross section is provided with concrete casting gaps 1 having a rectangular cross section that penetrate vertically at predetermined intervals, or extending over most of the entire length of the beam. It is also possible to provide a void for concrete pouring.

In this case, as shown in FIGS. 9 and 10,
At the location where the concrete casting void 1 is provided,
A cylindrical body 18 made of metal lath, expanded metal, etc. with open top and bottom ends is attached to the reinforcing bars of the beam in advance, and beam concrete is poured so that the cylindrical body 18 is not filled with concrete. hand,
Precast concrete beam A as shown in Figure 8
It is intended to produce.

Note that in FIGS. 9 and 10, parts equivalent to those of the above embodiment are given the same reference numerals.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal cross-sectional views showing the implementation status of a conventional cast-in-place concrete wall construction method in a precast reinforced concrete frame, respectively.
The figure is a slope view showing the implementation status of one embodiment of the method for constructing a cast-in-place concrete wall in a precast reinforced concrete frame according to the present invention, FIG. 4 is a longitudinal cross-sectional view thereof, and FIG. 5 is a method used in the method of the present invention FIG. 6 is a front view showing the implementation status of another embodiment of the method of the present invention, and FIGS. 7 and 8 are respectively a slope view of one embodiment of the precast concrete beam. The slope view, FIG. 9 and FIG. 10 showing each example are a partially cutaway plan view of the precast concrete beam shown in FIG. 8, and a vertical cross-sectional view showing its usage situation. be. A...Precast concrete beam, D...Cast-in-place concrete, 1...Void for concrete pouring.

Claims (1)

[Claims] 1. After erecting a precast concrete beam in a predetermined position, which has a concrete casting gap that penetrates in the width direction in the width direction and has built-in beam reinforcement, the precast concrete beam is inserted through the gap. A method for constructing a cast-in-place concrete wall in a precast reinforced concrete frame, characterized by pouring concrete for the wall portion located at the bottom of the frame.