JPH02171441A - Beam structure for building - Google Patents

Abstract

PURPOSE:To make a beam rationally executable by having a metal beam form unitized with beam concrete as a throwaway form. CONSTITUTION:A steel beam form 7 formed into an almost U-shaped section and solidly provided with a flange 8 at both ends is used as a throwaway form, and a specified support 9 is assembled at a ground position or at a factory, while beam concrete 12 is placed and hardened in a form in the state that beam lower end reinforcement 10 and stirrup reinforcement 11 are arranged, molding a precast concrete beam 3 in advance. Next, the support 9 is removed and both ends of the said precast concrete beam 3 are joined to a column 1 at a site position, and each joint is unitized in one by cast-in-place concrete. With this constitution, timbering such as a support or the like at the site is reduced, thus improvement in workability is promotable.

Description

[Detailed description of the invention] (Industrial use ￥f) The present invention relates to the structure of a beam in a building.

(Problems to be solved by the prior art and the invention) In buildings that employ reinforced concrete beams, such as reinforced concrete structures and steel-framed reinforced concrete structures, 1. Normally, when constructing the beams, predetermined reinforcement work is carried out on site. At the same time, beam formwork and shoring were assembled, and cast-in-place concrete was poured to integrate it with the columns.

However, with regard to such reinforced beams, the prices of the formwork and shoring cap materials have risen recently, and the on-site assembly work of formwork and shoring has also been affected by the shortage of skilled workers and rising wages. are facing the problem.

On the other hand, in the case of steel beams, the troublesome work of installing a fireproof coating is required, resulting in high costs.

Therefore, there is currently a need for a rational beam construction technique.

An object of the present invention is to provide a beam structure for buildings that solves the conventional problems.

(Means for Solving the Problems) In order to achieve the above object, the structure of a building beam according to the present invention is characterized in that a metal beam form is used as a waste form and is integrated with the beam concrete. That is.

The beam concrete is cast in the beam form in advance to form an integral precast concrete beam, and both ends of the precast concrete beam are joined to the columns at the site, and the joint is The beam form may be integrated with cast-in-place concrete, or both ends of the beam formwork may be joined to the column at the site, and cast-in-place concrete may be poured to integrate it with the column.

Further, it is desirable to provide a plate for joining with the column at both 1° IJ portions of the beam formwork.

Furthermore, in the case of the precast concrete beam, ]1? It is desirable to provide mesh-like weir plates near both ends of the I-beam formwork.

(Example) Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Figures 1 to 4 show an embodiment of the present invention. In this embodiment, the column 1 is composed of a steel pipe concrete column, and the beam 2 is composed of a precast concrete beam 3 and a cast-in-place beam part. It consists of 4.

In this embodiment, the column 1 is formed of a steel plate with ribs such as a so-called striped steel plate, and is configured so that the ribs 5 are on the inner surface, and the column concrete 6 and the steel pipe are fixed on the inner surface of the column 1. I'm trying to improve it.

Furthermore, as shown in FIGS. 3 and 4, the beam 2 has a precast concrete beam 3 formed in advance.

That is, in this embodiment, a steel beam form 7 having a U-shaped cross section and integrally extending flanges 8 at both ends is used as a waste form;
The precast concrete beam 3 is precast by assembling the specified shoring 9 on the ground or in a factory, and placing and hardening the beam concrete 12 with the beam bottom reinforcement 10 and scrap reinforcement 11 arranged in the formwork. It is designed to be molded.

Further, as shown in FIG. 3, plates 13 for joining with the pillars 1 are integrally provided at both ends of the beam formwork 7, and bolt mounting holes 14 are formed in the joining plates 13. ing.

Further, near both ends of the beam formwork 7, a mesh-like weir plate 15 is arranged at a position inside the joining plate 13, and when the beam concrete 12 is poured, the mesh-like weir plate Since the concrete 12 protrudes outward from the concrete 15 in an uneven shape and hardens, fixation and integration with the on-site beam part 4 described later is improved.

After the precast concrete beam 3 is preformed in step -11, the shoring 9 is removed and both ends of the precast concrete beam 3 are fixed to the pillars at the site. and the joints are integrated with cast-in-place concrete.

That is, first, the joining plates 13 provided at both ends of the beam formwork 7 are placed between the joining plates 13 of the same shape provided at corresponding positions on the column 1 as shown in FIG. The precast concrete beam 3 is supported by the column 1 by tightening and fixing the column.

At this time, both ends of the beam bottom reinforcement 10 are connected to the beam concrete 1
The beam bottom reinforcement 10 is connected to the phase Lt by penetrating the column 1 at the site position, and the end of the beam bottom reinforcement 10 is formed into a threaded reinforcing bar. Then screw the nut-shaped coupler 16 together.

In addition, a predetermined number of stirrup bars 11 are arranged such that their upper ends protrude from the concrete beam 12,
At the site, the beam top reinforcement 17 is arranged at a predetermined position, and each stirrup reinforcement 11 is hooked to the beam top reinforcement 17.
7 is also connected to the column 1 through the column 11 in the same way as the beam end 10 in the column 7.

Thereafter, column concrete 6 is poured into the steel pipe column l and hardened, and after hardening, the coupler 16 is tightened and fixed.

Finally, the concrete for the on-site beam portion 4 is poured and hardened at the same time as the floor concrete.

In this embodiment, the steel beam formwork 7 not only functions as a formwork when pouring concrete beams 12, but also functions as a formwork when the beam concrete 12 is placed. By connecting the joining plate 13 to the column l, it supports the self-weight of the precast concrete beam 3, and the need for support such as support during concrete pouring of the on-site beam part 4 is significantly less than before, making construction easier. It also improves sex and makes it more durable.

Furthermore, the beam formwork 7 is integrated with the beam concrete 12 and functions as a structural member even after the concrete is poured and hardened in the field-cast beam portion 4, so it provides a rational method of disposing If, l, and one frame. It is something that lasts.

In addition, by integrally fixing a cover plate (not shown) to the outer surface of the steel pipe column l in the portion where the through hole of the beam reinforcing bar 10.17 of No. 1111 is formed, and further forming ribs on the outer surface of the cover plate, the above-mentioned Together with the irregular surface for fixing formed by the mesh weir plate I5, it is possible to further improve the fixing with cast-in-place concrete.

In addition, in the above example, the precast concrete beam 3 is formed in advance, and only the cast-in-place beam portion 4 is concreted at the site location. Both ends of the beam formwork 7 in the state may be joined to the column 1 at the site, and then cast-in-place concrete may be poured over the entire beam to integrate it with the column 1. It goes without saying that various modifications are possible without departing from the gist of the invention.

(Effects of the Invention) The present invention is configured as described above, and by integrating the metal beam formwork with the beam concrete as a waste formwork, it can be used as a formwork and also function as a structural material along with the vine. This makes it a reasonable formwork construction method.

In addition, the beam concrete is placed in the beam formwork in advance to form an integral precast concrete beam, and both ends of the precast concrete beam are joined to the columns at the site.

If the joints are integrated by pouring concrete on-site, it is possible to reduce the amount of shoring such as support on-site and improve workability.

In this case, if mesh-like weir plates are provided near both ends of the beam formwork, a concave-convex joint surface will be formed, and the fixation with the cast-in-place concrete can be improved.

Furthermore, by providing joining plates to the pillars at both ends of the beam formwork, the weight of the beam portion can be supported by the pillars, allowing for more rational construction.

[Brief explanation of the drawing]

1 to 4 show one embodiment of the present invention. Fig. 1 is a vertical cross-sectional view of the main part of the joint between the column and beam according to this embodiment, Fig. 2 is a cross-sectional view taken along line 8-A in Fig. 1, and Fig. 3 is a block diagram showing an example of the configuration of a precast concrete beam. The side view and FIG. 4 are longitudinal sectional views thereof. 1... Company, 2... Beam, 3... Precast concrete beam, 4... On-site beam part, 5...
... Rib, 7... Beam formwork, 8... Flange, 9... Shoring, 10... Beam bottom reinforcement. 1... Stirrup reinforcement, 2... Beam concrete, 3... Joining plate, 5... Mesh weir plate, 6... Coupler, 17... Beam end. Figure i. Figure Figure

Claims (5)

[Claims] (1) A beam structure for a building, characterized in that metal beam formwork is used as waste formwork and is integrated with beam concrete. (2) The beam concrete is placed in the beam formwork in advance to form an integral precast concrete beam, and both ends of the precast concrete beam are joined to the columns at the site, and the joint is A beam structure of a building according to claim 1, which is integrated by cast-in-place concrete. (3) The beam for a building according to claim 1, wherein both ends of the beam formwork are joined to columns at the site, and poured concrete is poured on site to integrate the beam with the columns. structure. (4) A beam structure for a building according to any one of claims 1 to 3, wherein plates for joining the pillars are provided at both ends of the beam formwork. (5) The structure of a beam for a building according to claim 2 or 4, wherein mesh-like weir plates are provided near both ends of the beam formwork.