JPH06280332A - Permanent formwork for concrete construction - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to make a permanent formwork for concrete work easy and surely fixed, and to reduce the weight even though it is made of concrete. [Structure] A fiber-reinforced cement plate-shaped body 1A having a plurality of ridges 2 ... 2 formed on a back surface 1B, and a hollow hole 3 that penetrates in a length direction and opens at an end 1C within a wall thickness. 3, a concrete hollow formwork 1 in which widthwise end portions 1D are provided with step-like engagement step portions 4A and 4B which are fitted to each other.
A and a connecting fitting 5 fitted along the end of the concrete hollow formwork having an engaging piece 5A inserted into the hollow holes 2, ... Connect the formwork.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent formwork for concrete work.

[0002]

2. Description of the Related Art Generally, when building a concrete wall, a formwork made of plywood is assembled, concrete is poured into the formwork to wait for hardening, and the formwork is removed to apply various makeups to the surface or In the case of heat insulation walls, construction was performed by the procedure of attaching heat insulation materials. However, in the case of the above-mentioned formwork method, the formwork is used only as a mold for constructing a wall surface, and there is a drawback that the subsequent work of removing the formwork takes a lot of time and effort.

Further, since the conventional formwork is made of plywood and uses natural materials, even if it is repeatedly used, it will eventually be discarded, and the amount used in one construction work is very large. In addition to this, the consumption of natural materials is significant, and it is desirable to limit their use from the viewpoint of protecting the natural environment. From such a viewpoint, a concrete formwork made of fiber reinforced cement has been proposed, and it has been proposed to use it instead of the conventional plywood formwork (for example, Japanese Patent Laid-Open No. 3-2934).
No. 73 bulletin). This kind of concrete formwork has an advantage that it hardly uses natural resources such as wood, and finally it is integrated with the concrete to be placed, and it is directly integrated with the walls or columns of the building structure. This has the advantage that the subsequent frame removal work can be omitted.

[0004]

[Problems of the prior art] However, since the concrete formwork is hard in material, it is difficult to nail and fix it during frame work, and a very complicated support structure is required to obtain fixing strength for temporary fixing and concrete pouring. There was a drawback that required. Further, since the concrete formwork has a heavy weight due to its material, there are various problems that work in high places is dangerous.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention has an object of providing a lightweight permanent mold for concrete construction in which the mold can be fixed easily and surely. It was made.

[0006]

That is, the permanent formwork for concrete construction of the present invention is a fiber-reinforced cement plate-shaped body having a plurality of convex strips formed on the back surface, and the end portion within the wall thickness. A permanent formwork for concrete work, which is provided with a hollow hole penetrating in the lengthwise direction and is provided with stepwise engaging step portions that fit with each other at the widthwise end, and is inserted into the hollow hole. And a connecting fitting fitted along the end of the permanent mold for concrete construction, which has an engaging piece.

[0007]

Embodiments of the present invention will be described below. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a plan view of another embodiment, and FIG. 3 is a perspective view of a main part of still another embodiment.

Permanent formwork 1 for concrete work according to the present invention
Is a fiber-reinforced cement plate-shaped body 1A in which a plurality of convex stripes 2 ... 2 are formed on the back surface 1B, and hollow holes 3 ... 3 penetrating in the length direction opening to the end portion 1C within the wall thickness. Is provided,
The widthwise end portion 1D has a stepped engagement step portion 4 which is fitted to each other.
Permanent formwork 1A for concrete construction with A and 4B
And a fitting 5 having an engaging piece 5A inserted into the hollow holes 2 ...
It consists of and.

In the above-mentioned embodiment, the connection fitting 5 is formed by notch molding of a metal plate or the like, and is connected to a key portion of the metal plate formed along the end face of the permanent formwork 1A for concrete construction as shown in FIG. A notch 5B for the joint piece 5A is provided, and a necessary portion is folded up to form an engagement piece 5A.
Are inserted into the hollow holes 3 ... Also, the engaging piece 5
In order to secure the engagement between A and the hollow hole 3 more surely, the engaging piece 5A is bent in a zigzag shape as shown in FIG. 1 so as to be elastically fitted. It is desirable to do.

Further, the case where the connection fitting 5 is applied to the end surface of the permanent formwork 1A for concrete construction is shown, but as shown in FIG. 3, the engaging piece 5A is applied to the end side surface.
Can be an extension piece extending into the hollow holes 3 ... 3 of the mold 1A. Further, as shown in FIG. 4, as connecting fittings 5, engaging pieces 5A are formed by projecting on both front and back surfaces, and the permanent fittings 1A for concrete construction are constructed with the connecting fittings 5 as boundaries.
Can also be configured to be butt-joined. Alternatively, the engaging pieces 5A may be a pair of opposing pieces as shown in FIG. 5, and the engaging pieces 5A may be engaged by the elastic force of these pieces.

[0011]

In the present invention, when assembling a concrete hollow formwork, the concrete hollow formwork 1A is erected at a required position, and then the connecting fitting 5 is fixed to the upper end of the concrete hollow formwork 1A while inserting the engaging piece 5A into the hollow hole. I will do it. At this time, at the same time, the connection fitting 5 may be similarly engaged with the lower end surface.
The concrete hollow formwork 1A to be joined has its hollow hole 3
3 is fixed by the connecting fitting 5 in which the engaging piece 5A is inserted, and thereafter, the upright posture is maintained without using a supporting frame or the like.

[0012]

As described above, the present invention utilizes the hollow holes 2 ... 2 of the concrete hollow formwork 1A having a hollow hole, and the engaging piece 5A is inserted into this hole to fix the connection fitting 5. As a result, the concrete hollow molds 1A can be reliably connected to each other without using fastening nails, and the connection work is greatly simplified. Further, since the concrete hollow formwork 1A itself has hollow holes, it is lightweight and has an effect of facilitating transportation and mounting work.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a perspective view of another embodiment.

FIG. 4 is a perspective view of another embodiment.

FIG. 5 is a sectional view of an essential part of still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Permanent formwork for concrete construction 1A ... Concrete hollow formwork 1B ... Back surface 1C ... Width direction end part 2 ... Convex strip 3 ... Hollow hole 4A, 4B ... Engaging step part 5 ... Connection metal fitting 5A ... Engaging piece

Claims (1)

[Claims] 1. A fiber-reinforced cement plate-shaped body having a plurality of convex stripes formed on the back surface, wherein a hollow hole penetrating in the length direction is formed in an end portion, and the hollow hole is formed in the width direction. The permanent formwork end for concrete work, which has a permanent formwork for concrete work provided with stair-like engagement step parts that fit together at the end, and an engagement piece to be inserted into the hollow hole Permanent formwork for concrete construction, characterized in that it consists of connecting fittings applied along the