JPH07216986A - Permanent form at four corners of joint at upper part of precast concrete column - Google Patents

Abstract

PURPOSE:To greatly simplify form-setting work at the construction site and to sharply shortening the working time when a form is placed at the four conrners of a joint at the upper part of a PCa column. CONSTITUTION:A form to be placed at the four corners of a joint at the upper part of a PCa column 1 is formed from a permanent form steel plate 4 and an anchor plate 5. The plate 4 is formed into a bent-plate shape by providing a rib 4b to be attached to the side of a beam integrally with a body 4a having an angular section, and fixing parts 4c, 4d are formed at the upper end and the lower end of the plate 4 respectively. The anchor plate 5 is embedded in the upper corner of the PCa column 1. By fixing the upper and lower ends or the lower end only, form-setting work is completed. The steel plate 4 is formed from the body 4a and the rib 4b, whereby the plate 4 can resist side pressures of concrete without using another rib material or reinforcement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scrap frame which is arranged at the four corners of a precast concrete column.

[0002]

2. Description of the Related Art Precast concrete (hereinafter referred to as PC
As one of the construction methods using the product, PCa columns and PCa beams or concrete formwork for beams are used.
There is a method in which formwork for corners is attached to the four corners between the beams in the upper part of the Ca column, and concrete is placed on the column-beam joints and on the beam to wet-join each member.

In such a construction method, a plywood and a reinforcing material for a general concrete formwork have been frequently used in the formwork for the corners, and an anchor nut embedded in a PCa pillar member or the like has been conventionally used. Is fixed using.

[0004]

However, in the case of the conventional formwork as described above, although the formwork area is small, since a general formwork is used, the anchor nut is used in the factory. It is embedded, and on the site, troublesome fixing work of the formwork and work to remove the formwork are performed, which requires a long time for the work and the work efficiency is very poor.

The present invention has been made to solve the above-mentioned problems, and the purpose thereof is to improve the work efficiency by making the form work on the site extremely simple.
The purpose of the present invention is to provide a scrap frame disposed at the four corners of the connecting portion above the pillar.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a scrap frame, which is arranged between a beam (PCa beam or beam form) at the four corners of a connecting part in the upper part of a PCa column, and has a mountain-shaped cross section. The main body is made into a folded plate shape by integrally providing ribs attached to the side of the beam, and the scrap frame steel plate for the corners with fixed parts at the upper and lower ends and the corners of the upper part of the precast concrete column It is composed of an anchor metal part which is embedded in a corner part and to which the lower end of the scrap frame steel plate is attached.

The upper end of the scrap frame steel plate is fixed by welding the fixed part of the scrap frame steel plate when the scrap frame for steel floor is used, and in the case of PCa floor plate, the pillar of the PCa floor plate. It is not necessary to fix it because it is pressed against the shape notch by the pressure of concrete and becomes stable.

[0008]

In the above structure, the scrap frame steel plates for the corners are arranged on the anchor metal fittings at the four corners of the joint, and the lower end of the scrap frame steel plate and the anchor hardware are fixed by welding or the like.
If necessary, the upper end of the scrap frame is fixed to the scrap frame for floors by welding, and concrete is placed at the column / beam joints. The discarded form steel plate is left as a part of the pillar without being removed even after the concrete is placed.

The scrap frame steel plate for the corner portion is a folded plate composed of a main body having a chevron cross section and ribs integral with the main body, and another rib material or reinforcing material is added to the lateral pressure of concrete. You can easily resist by simply fixing the upper and lower ends. This facilitates the manufacture of the mold and the mounting work.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an illustrated embodiment. Fig. 1 uses PCa pillars 1 and concrete formwork 2 for beams, concrete is placed on the pillar-beam joints, concrete formwork 2 for beams, and waste formwork 3 for floors, and each member is placed. This is an example of wet joint. It should be noted that the reinforcing bars of the columns and beams are omitted in FIG.

In such a structure, corner scrap steel plates 4 are arranged between the concrete molds 2 for beams at the four corners of the upper part of the PCa pillar 1, and the anchor metal pieces 5 are attached to the corner parts of the PCa pillar 1. Install.

The scrap frame steel plate 4 is formed by bending a steel plate having a thickness of about 1.2 to 1.6 mm, which is usually used as a scrap steel frame, and has bending ribs 4b on both sides of a main body 4a having a chevron cross section. It is integrally formed. Further, flanges 4c and 4d are integrally bent and formed on the upper and lower sides of the main body 4a.

The main body 4a has such a size as to cover the space between the adjacent concrete molds 2 for beams, but the width dimension L in FIG.
For _1, as defect Joint portions planar cross-sectional dimensions by location error of the beam for concrete formwork 2 to PCa Column 1 above does not occur, for beam design dimensions of L ₁ from the side of PCa Columns 1 Set the size about 5 mm larger than the size of the design drawing up to the side of the concrete formwork 2 (see Fig. 3).

The width dimension L ₂ of the bent ribs 4b on both sides is set so as to ensure the strength and rigidity required for the ribs. In this example, the steel sheet is not inserted into the concrete section of the joint portion, and the rib is bent outward in consideration of the bending compression / buckling strength of the rib. Further, the bent ribs 4b are brought into close contact with the side surfaces of the concrete frame 2 for beams directly, and it is not necessary to adjust the dimensions using other materials.

As shown in FIG. 1, the anchor metal 5 is a mountain-shaped member in which an anchor 5a is attached to the lower portion, and its upper surface and outer side surface are flush with the upper surface and side surface of the PCa column 1. Buried in the corner.

The lower flange 4d is a portion which is placed in contact with the anchor metal 5 and fixed by welding. In this example, since the bending rib 4b projects outward from the side surface of the PCa pillar 1, it is bent inward. To form.

The upper flange 4c is bent outward,
The floor formwork 3 can be supported. This floor scrap frame 3 is made of steel plate and is fixed by welding.

The dimensions of the upper and lower flanges 4c and 4d are set so that concrete does not flow out because the strength as a rib is not required so much. In addition, the welded portions are the two corners in FIG. The reaction force of the weld is
It will work in the direction of the arrow in FIG.

Incidentally, the scrap frame steel plate 4 and the anchor metal piece 5
By using a galvanized steel plate as in the floor scrap frame 3, it is possible to prevent rust during construction.

In the above structure, the scrap frame steel plate 4
Is arranged on the anchor metal fittings 5 at the four corners of the joint, and the lower end of the scrap frame steel plate 4 and the anchor metal fitting 5 are fixed by welding.
Only by fixing the upper end of the scrap frame steel plate 4 to the scrap mold for floor 3 by welding, the mounting of the corner mold is completed.

As shown in FIG. 2 (a), in the scrap frame steel plate 4, the bent portion of the main body 4a and the bent portions of the main body 4a and the bending ribs 4b act as vertical ribs, and against the lateral pressure of concrete. You can resist by simply fixing the upper and lower ends. There is no need to add another rib material or reinforcing material, and the manufacture of the mold and the work of the mold become easy.

The anchor metal 5 to which the lower end of the scrap frame steel plate 4 is fixed is a mountain-shaped member arranged in the corner portion of the PCa column in plan view, and even if it is simply fixed, no deviation occurs during concrete pouring. . Moreover, since the fixing of the upper and lower ends of the scrap frame steel plate 4 is welding, the fixing work becomes easy.

In the above, the example using the concrete formwork for the beam and the waste formwork for the floor has been shown, but the present invention is not limited to this.
Needless to say, the present invention can be applied to the case of using the a-beam and the PCa floorboard.

[0024]

As described above, the scrap frame at the four corners of the connection part at the upper part of the PCa pillar according to the present invention is a scrap frame steel plate for corners,
The main body having a chevron cross section is integrally provided with ribs attached to the side surfaces of the beam to form a folded plate shape, and the upper and lower ends of this scrap frame steel plate are fixed to an anchor metal of a PCa pillar, a scrap frame for floor, etc. As a result, by simply fixing the upper and lower ends, it is possible to resist the compressive lateral pressure, facilitating the manufacture of the corner form, and making the form installation work extremely easy. The time can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mounting state of scrap frames at four corners of a connecting portion on an upper part of a PCa pillar according to the present invention.

FIG. 2 is a cross-sectional view showing the scrap frame steel plate of FIG.

FIG. 3 is a sectional view showing an example of an embodiment of the present invention.

[Explanation of symbols]

 1 PCa pillar 2 Concrete formwork for beams 3 Waste formwork for floor 4 Waste formwork steel plate for corners 4a Main body 4b Bending ribs 4c, 4d Flange 5 Anchor hardware

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Ken Kitamura 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd.

Claims (1)

[Claims] 1. A scrap frame disposed between beams at four corners of a precast concrete column upper part of a precast concrete column, wherein ribs attached to side surfaces of the beam are integrally provided on a main body having a chevron cross section. It is made into a folded plate shape, and it is embedded in the corner form part of the precast concrete pillar upper part and the corner form part of the precast concrete column where the fixed parts are formed at the upper and lower ends, and the lower end of the scrap frame plate is attached. An abandoned formwork at the four corners of the precast concrete pillar, which is equipped with anchor hardware.