JP2534681Y2 - Precast beam formwork - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a beam formwork for holding concrete to be poured into a reinforced concrete construction to have a predetermined shape and dimensions in order to construct a beam.

[Conventional technology]

In the conventional beam formwork, the beam formwork and the shear reinforcement are usually separate bodies.

Then, in the conventional formwork, first, a dam is assembled in accordance with the shape of the beam to be constructed. After that, attach the shear reinforcement to the main reinforcement, then insert a spacer to secure the cover between the crevice plate and the reinforcing bar, install a separator to secure the gap between the crevice plates, and support by tightening brackets etc. The beam form is fixed. After that, concrete is poured, and after the concrete is hardened, the dam and the support are removed to construct a beam.

There is also a precast formwork in which the beam formwork and the shear reinforcement are integrated. In this case, the shear reinforcement penetrates the inside of the thickness of the beam form along the inner surface of the beam form. Had been arranged.

[Problems to be solved by the invention]

However, if a beam formwork separate from the conventional shear reinforcement is used, work described above such as tying the shear reinforcement to the main reinforcement or attaching a spacer between the reinforcement and the dam plate at the site. However, there is a problem that the formwork is complicated.

In addition, there were also problems that the shear reinforcing bars could not be accommodated in the formwork, and that the spacers installed between the reinforcing bars and the dams were detached during the work of the formwork, so that the fogging became inappropriate.

Furthermore, when using a beam formwork in which the beam formwork and the shear reinforcement are integrated, the covering can be reliably secured, but the thickness of the beam formwork is not only the thickness to secure the covering but also the shearing. Since a thickness for holding the reinforcing bar is also required, there is a problem that the thickness of the beam form is considerably increased and the form itself becomes heavy.

This invention eliminates the need to bind shear reinforcement to the main bar,
It is another object of the present invention to provide a lightweight beam formwork that reliably secures cover.

[Means for solving the problem]

In order to solve the above-mentioned object, the precast beam form of the present invention has a rib formed integrally with the beam form on the inner surface of the beam form having a U-shaped cross section, and has a shear reinforcing bar. It is characterized by being arranged along the inner surface of the beam formwork and penetrating the inside of the rib.

[Action]

In the formwork construction using the beam formwork of the present invention, the beam formwork is arranged at a predetermined position on the site, and a cap tie is attached as necessary to cast concrete. The outer surface of the beam form forms the surface of the constructed beam.

Here, since the shear reinforcement is arranged in advance on the inner surface of the beam form, it is not necessary to bind the shear reinforcement to the main reinforcement, and the shear reinforcement is covered from the outer surface of the beam form. Is fixed to the rib protruding from the inner surface only at the distance of, there is no need to secure a cover by installing a spacer. Furthermore, since the beam formwork becomes a part of the constructed beam, the work of removing the beam formwork is only the work of dismantling the scaffolds and supports. Furthermore, since the beam form is formed to be thinner than the thickness of the covering, the beam form becomes lighter,
The beam formwork can be easily transported and installed.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a precast beam formwork 1 according to the present invention.

First, the structure will be described. This beam form 1 has a U-shaped cross section and is open at the top, and its inner surface is provided along the longitudinal direction at the center of each of the side surfaces 1a and the bottom surface 1b. Ribs 2 and 3 are integrally provided. Also, on the inner surface of the beam form 1, along the inner surface, the three ribs 2,
U-shaped shear reinforcing bars 4 are provided so as to penetrate transversely across each of 3 and both ends are bent.

Here, the beam form 1 and the ribs 2 and 3 are manufactured using an inorganic material, and the thickness of the beam form 1 is formed to be as thin as about 5 to 20 mm. The height is formed to about 25 to 35 mm, and the penetrating position of the shear reinforcement 4 is set to be 40 mm away from the outer surface of the beam formwork 1 to secure a cover of 40 mm. Since these numerical values are merely examples, it is a matter of course that each unit can be set to other numerical values.

As shown in FIG. 3, the formwork using the formwork in which the beam formwork 1 and the shear reinforcing bar 4 having the above-mentioned structure are integrated, first,
A beam scaffold, a support, and the like (not shown) are assembled, and the beam form 1 is arranged at a predetermined position so that the main reinforcement 5 is accommodated inside the beam form 1, and fixed between main columns (not shown). In this state, a cap tie is attached as necessary, concrete is poured into the beam formwork 1, and when the concrete is hardened, the scaffold and the support are dismantled, and the construction of the beam is completed. At this time, the beam form 1 becomes a part of the beam, and the outer surface of the beam form 1 forms the surface of the beam.

As described above, the shear reinforcement 4
Is arranged, there is no need to bind the shear reinforcement 4 to the main reinforcement 5. Further, since the shear reinforcing bars 4 are fixed to the ribs protruding from the inner surface at a distance from the outer surface of the beam form 1, there is no need to secure a cover by installing a spacer. .

Further, since the beam formwork 1 becomes a part of the constructed beam, the demolition work of the formwork is only the demolition work of the scaffold and the support.

Further, the thickness of the beam form 1 can be formed smaller than the thickness of the covering, so that the beam form 1 becomes lighter and the beam form 1
Can be easily transported and installed.

In the above example, the ribs 2 and 3 are provided on both side surfaces 1a and the bottom surface 1b of the beam formwork 1. However, if the shear reinforcement 4 is fixed, only two places on both side surfaces 1a may be used. Good, ribs 2,3
May be provided at the upper part of the side surface 1a or the like.

Also, as shown in FIGS. 4 and 5, a plurality of ribs 2 are projected at predetermined intervals along the inner surface of the beam form 1 in a direction orthogonal to the longitudinal direction of the beam form 1. And a U-shaped shear reinforcing member 4 may be penetrated so as to traverse the inside of the rib 2. In this case, separately from the shear reinforcement 4 integrated with the beam form 1, a separate shear reinforcement may be provided in the beam form 1 at the site.

Further, the ribs 2, 3 are provided in a plurality of directions in order to strengthen the beam form 1 such that the ribs 2, 3 are provided so as to extend in both the longitudinal direction of the inner surface of the beam form 1 and the direction perpendicular thereto. It may be provided.

[Effect of the invention]

As described above, the use of the precast beam formwork of the present invention eliminates the need to tie the shear reinforcing bars to the main bars or attach spacers to secure the covering at the site. The frame work is simplified, and the shear reinforcement fits in place,
There is an effect that the cover can be surely secured.

In addition, since the thickness of the beam form is reduced, the form itself is reduced in weight, and there is also an effect that the form is easily transported and installed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a first embodiment, and FIG.
FIG. 3 is a front view showing a state in which main bars are arranged inside, FIG. 4 is a cross-sectional view showing the second embodiment, and FIG. 5 is a top view of the same. 1 ... beam form, 2,3 ... rib, 4 ... shear reinforcement, 5 ...
… Main line

Continuing on the front page (72) Minoru Kamikoto 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Koichi Tamura 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Kazuo Ueda 1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Yasuhiko Kawai 1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Within Construction Co., Ltd. (72) Inventor Haruo Sasaki 1-25-1, Nishi Shinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (56) References JP-A-2-80746 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. An inner surface of a beam formwork having a U-shaped cross section,
A precast beam formwork, wherein a rib integral with the beam formwork is protruded, and a shear reinforcement is provided along the inner surface of the beam formwork and penetrates through the rib.