JP6379045B2 - Structure of beam-bottom formwork support bracket and PCa beam joint and its construction method - Google Patents

Description

  The present invention relates to a structure of a beam-bottom formwork support metal fitting and a PCa beam joint portion in a center joint portion of a precast concrete (abbreviated as PCa, hereinafter the same) beam and a construction method thereof.

  Conventionally, as shown in FIG. 4, in the formation of the center joint portion of the PCa beams 13 and 13 in the PCa construction method, as shown in FIG. Formed on the left-hand side is a formwork 14 and a support 15 erected from a slab 16 to support the formwork on the beam bottom, and is formed by placing concrete in the formwork 14. . As a prior application of this conventional example, a PCa method shown in FIGS. 5 and 6 of Patent Document 1 is known.

JP 2000-336929 A

  However, in the construction method in which the conventional beam bottom formwork is supported by the support work 15 and concrete is placed in the formwork on the beam bottom and the left and right sides to form the center joint portion of the PCa beam, Then, after the setting concrete is hardened, a work process of removing the support 15 for removing the formwork occurs. In addition, because the support work 15 exists under the center joint part, it not only interferes with other work such as movement of workers and material loading / unloading work, but also due to the labor shortage of formwork carpenters in recent years, There is a problem that if the work process of formwork increases, it causes a delay of the whole process.

  The beam-bottom formwork support metal fitting, the structure of the PCa beam joint portion and the construction method thereof according to the present invention have been proposed in order to solve such problems.

  The gist of the present invention for solving the above-mentioned problems of the beam bottom formwork support bracket according to the present invention is to straddle the beam bottom bars arranged in parallel with a gap in the joint portion of the precast concrete beam. A U-shaped separator bar formed so as to be suspended, and a mold receiving nut screwed to the end of the separator bar.

  The gist of the structure of the PCa beam joint according to the present invention is that, in the joint portion of the precast concrete beam, the beam bottom formwork support fitting is appropriately spaced in the connection direction at the beam lower end bar connected by the connecting means. It is arrange | positioned and suspended and the filler is filled into the removal part of the nut by the said support member for beam bottom formwork.

  The gist of the construction method of the PCa beam joint portion according to the present invention is to form the beam-bottom formwork support bracket according to the present invention, arrange the precast concrete beams facing each other, and then arrange the facing precast concrete beams. The beam bottom formwork is formed by connecting at least the beam bottom reinforcement in the joint portion and placing the beam bottom formwork support brackets on the beam bottom reinforcement arranged in parallel with a gap therebetween. A beam bottom mold is attached to the support bracket for the beam, and the beam bottom mold is supported by the beam bottom reinforcement via the beam bottom mold support bracket, and the beam side mold is attached to the left and right sides of the joint portion. It is made to support, and concrete is cast in the form formed by the beam bottom formwork and the beam side formwork of the joint part.

  According to the beam-bottom formwork support bracket, the structure of the PCa beam joint and the construction method thereof according to the present invention, the beam-bottom formwork is supported by the beam lower end bar via the beam-bottom formwork support bracket. Therefore, the work process of the formwork can be shortened to cope with labor shortage, resulting in an excellent effect of contributing to the shortening of the entire process.

It is a front view of the PCa beam joint part which shows the use condition of the support member 1 for beam-bottom formwork which concerns on this invention. It is the partially expanded front view (A) and the same side view (B) of the use condition of the beam-bottom form support bracket 1 of this invention. It is a partially expanded sectional view which shows the state repaired with the filler after removing the nut of the beam-bottom formwork support bracket 1 of the PCa beam joint part. It is a side view which shows a mode that the beam bottom formwork of the PCa joint part which concerns on a prior art example is supported by the support work 15.

  As shown in FIG. 1, a beam bottom mold support 1 according to the present invention is suspended from a beam lower bar 4 to support a beam bottom mold 6.

  As shown in FIGS. 2 (A) and 2 (B), the beam bottom mold support bracket 1 is a beam arranged in parallel with a gap in the center joint portion of the PCa beams (see FIG. 4) 13 and 13. A U-shaped separator line 2 formed so as to be suspended over the lower end bars 4, 4, and a formwork receiving nut 3 for receiving a formwork screwed to the end of the separator line 2; Consists of.

  The separator line 2 is formed in a U-shape and is placed across the adjacent lower beam bars 4, 4. However, as shown in FIG. 1, only two adjacent lower beam bars are used. Alternatively, one or a plurality of beam lower end bars may be placed between them, and may be formed in a U-shape having a size so as to extend over the beam lower end bars 4 and 4 on both sides thereof.

  The mold receiving nut 3 is, for example, a P cone or a hexagonal washer. This is selected by the difference in the finish of the concrete body surface.

  As shown in FIGS. 1 to 2A and 2B, the structure of the center joint portion using the beam bottom mold support 1 is connected by a connecting means such as a mechanical joint (not shown). The beam bottom formwork support bracket 1 is hung across the beam lower end bars 4, 4, and is arranged at appropriate intervals in the connection direction (longitudinal direction) of the beam lower end bars 4. As shown in FIG. 3, a filler 12 is filled in the removal trace 11 a of the mold receiving nut 3 by the beam bottom mold support 1.

  Moreover, as a formation method of this center joint part, for example, the beam-bottom mold support bracket 1 shown in FIG. 2 is formed. After the PCa beams 13 and 13 are opposed to each other and installed on a pillar and supported by a support, the beam upper and lower beam bars 4 and 4 at the center joint portion of the opposed PCa beams 13 and 13 are connected by a mechanical joint or the like. Then arrange the bars.

  The beam-bottom form support bracket 1 is suspended from, for example, two to three by placing the beam bottom struts 4 and 4 arranged side by side at intervals. If the mold receiving nut 3 is a P cone, a screw rod 3a in a foam tie (registered trademark) 3b is screwed to the P cone, and the screw rod 3a and the P cone mold receiving nut 3 are connected to each other. Screw on the threaded portion of the end of the separator line 2.

  The beam-bottom mold 6 is attached to the beam-bottom mold support bracket 1, and the end thick members 7 are supported orthogonally to each other, and fixed with the fastening bracket 8 and the nut 9 in the foam tie (registered trademark) 3b. To do.

  Next, as shown in FIG. 1, a beam-side formwork 10 is attached and supported on the left and right sides of the center joint portion. In addition, any of the beam bottom mold 6 and the beam side mold 10 may be constructed first, and the order is not particularly limited. Then, concrete is placed in the opposite end face of the PCa beam 13 and the mold formed by the beam bottom mold 6 and the beam-side molds 10 and 10 of the center joint portion.

  As shown in FIG. 3, when the cast concrete 11 exhibits the required strength, the beam bottom and beam side molds 6, 10 are removed. Then, filling material 12 such as mortar is filled in the P-cone recessed removal mark 11a which is the mold receiving nut 3 of the beam-bottom mold support fitting 1.

  Thus, the center joint part is constructed by the construction method of the PCa beam joint part. In the center joint portion, the support work 15 is not installed thereunder, so that the worker can easily move and pass through and carry in and out the material, and the work of installing and removing the support work 15 is not required.

1 Support bracket for beam bottom formwork,
2 Separator streaks,
3 Formwork receiving nut, 3a Screw rod,
3b Form tie (registered trademark),
4 Beam bottom reinforcement,
5 Stirrup, stirrup
6 Beam bottom formwork,
7 End thick wood,
8 Fastening bracket,
9 nuts,
10 Beam side formwork,
11 Concrete,
11a Removal trace,
12 Filler,
13 PCa beams,
14 formwork,
15 Support work (support),
16 Slab.

Claims (3)

In the joint part of the precast concrete beam, a U-shaped separator bar formed so as to be suspended across the beam lower bar lined in parallel with a gap,
A nut for receiving a mold screwed to an end of the separator line,
Supporting bracket for beam bottom formwork characterized by In the joint part of the precast concrete beam, the beam bottom formwork support metal fitting according to claim 1 is arranged in the connection direction at an appropriate interval and suspended from the beam lower end bars connected by the connection means, and the beam Filler is filled in the removed part of the nut by the support bracket for the bottom mold,
PCa beam joint structure characterized by Forming the beam bottom formwork support bracket according to claim 1,
After placing precast concrete beams facing each other,
Connecting at least the beam bottom bars in the joints of the opposed precast concrete beams;
The beam bottom mold support bracket is suspended by being placed across the beam lower end bars arranged in parallel at intervals,
The beam bottom mold is attached to the beam bottom mold support bracket, and the beam bottom mold is supported by the beam bottom line via the beam bottom mold support bracket.
Attach and support the beam-side formwork on the left and right sides of the joint part,
Placing concrete in a mold formed by a beam bottom mold and a beam side mold of the joint part;
The construction method of the PCa beam joint part characterized by these.

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