JPS63125774A - Concrete mold frame - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to formwork used for concrete pouring.

[Conventional technology]

The technique of laminating a transparent plate sheet-like material to a water-permeable material to form a formwork has already been described in JP-A-60-43528.

A water-permeable sheet material such as woven fabric is attached to the inner surface of a perforated metal form or plywood formwork, and air bubbles and excess water in the concrete are drained from the gaps between the sheet materials7, eliminating air flapping on the concrete surface. , concrete with high strength is poured.

This construction method is an excellent construction method because it provides a clean surface and produces concrete with high strength even when using concrete with a high water/cement ratio. However, even at monument sites where sheep are treated roughly, there is a problem in attaching the sheet-like material to the formwork so that it does not come off easily.

Attaching with adhesive is cumbersome, easy to peel off, and expensive. Conventionally, hooks are attached to the periphery of the sheet, pulled with rubber, and hooked onto the holes in the formwork on the back side to attach the sheet, but this method is time-consuming and labor-intensive. Furthermore, if the sheet peels off during construction, concrete will leak from the holes in the formwork, and the intention of pouring good concrete will be reversed.

[Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned problems and provide a large formwork that is easy to install and has a high degree of safety.

(c) Means for Solving Problems] In the present invention, a bag is formed from a water-permeable sheet-like material, and a mold made of a rigid plate is loaded into the bag.

[Function] With this configuration, water-permeable bags mass-produced in factories,
Just by loading the formwork, a water-permeable sheet is spread on the surface of the formwork. Furthermore, since the sheet-like materials are installed on both the front and back sides of the formwork, there is no fear of concrete leakage.

Furthermore, since it is loaded into bags, it is possible to load composite plates, and by connecting the bags, it is possible to create new advantages such as creating a bendable formwork.

I will clarify.

As shown in FIG.
form. The bag body has flexibility and water permeability.

A perforated plywood board 3 provided with a large number of water passage holes 2 is loaded to the full width of this bag, and the openings are sewn to complete the water-permeable formwork A of the present invention.

The knitting and suturing part was made somewhat wider to form the connecting part 4 of the formwork. Eyelets 5 may be attached to the connecting portion at appropriate intervals.

The method of using the formwork of the present invention may be similar to that of conventional formworks.

[Example 2] As shown in FIG. 2, the connection parts 4 on the side edges of the bag 1 described in the previous example 1 are sewn together to form a continuous bag, and the perforated plywood 3 is attached to each bag. is loaded and the opening is closed to form a folding screen formwork B.

Since large formwork is formed by continuous use, it is suitable as formwork for large structures such as dams and dams.

In addition, since the connecting portion is flexible, it can be bent, making it suitable as a formwork for curved surfaces such as arch-shaped objects, columns, beams, and intricate parts. For example, by bending a four-part formwork and assembling it into a prismatic shape, you can easily solve the problem of continuity at the corners, which is the most troublesome part of formwork construction.

[Example 3] Fig. 3 shows that a foamed resin board 7 having open cells such as polyurethane was superimposed on the surface of a control panel 6 without water holes, and the board was loaded into a water-permeable bag 1. It is something. When pouring highly fluid concrete with a high water/cement ratio into a narrow space, it is convenient to pour the concrete with the foamed resin plate facing inside, as excess water can be removed from the entire surface. In this case, the back surface of the bag may be made of a water-impermeable sheet. Foamed resin in general! Because it has thermal properties, it is effective in preventing concrete poured in the winter from freezing.

〔supplementary explanation〕

The material of the bag is generally made of synthetic fibers with high tensile strength, such as nylon, polyester, and polypropylene, but is not particularly limited. Since the mouth can be closed by heat welding, it is desirable to use fibers with a relatively low melting temperature, such as polypropylene.

In the embodiment, the bag was made of woven fabric, but it may also be made of non-woven fabric or a plastic film with many small holes, as long as it is water permeable.

In either case, the mesh must be so fine that the cement content of the concrete does not easily flow out.

It is advantageous to use heat-shrinkable woven or non-woven fabric, and after loading the plywood, a heating furnace is connected to shrink the sheet-like material on the surface, so that it sticks tightly to the plywood without wrinkles.

The bag does not necessarily need to be woven together at the weaving stage, and may be made into a bag by sewing two layers of woven or nonwoven fabric. Further, the peripheral connecting portions are also not essential.

Although plywood was used as the rigid plate in the embodiment, the material is not limited as long as it can withstand the pressure of concrete pouring. In addition to plywood, ribbed steel plates, corrugated steel plates, wire mesh, and wood panels are commonly used. It is also possible to make use of the ribs to increase the spacing between the flaps.

In addition, since it is loaded into a bag, the range of plates that can be used is greatly expanded; for example, wood wool cement plates, expanded metal plates, etc. may be used. A steel plate with an uneven pattern may also be used. In the case of a plate with unevenness, it is difficult to paste the sheets together using the conventional method, but according to the present invention, it can be loaded into a bag in the same way as a flat plate.

The rigid plate must have water permeability, but even if the plate itself does not have water permeability, it may be combined with a water permeable plate. For example, waterproof paper honeycomb panels may be lightweight and strong, but are difficult to provide with backwater holes. In such a case, the problem of water permeability can be solved by laminating a foamed 4H resin board with open cells to the surface. Knitted fabrics, non-woven fabrics, and cloaks with a thickness of several millimeters to 1 centimeter can be used as water-permeable materials.

The scope of use of the formwork of this invention is that of conventional metal forms.
Like plywood formwork, it can be applied to a wide range of surfaces, including horizontal, vertical, and sloped surfaces. The same goes for preventing deflection by using various kinds of butter materials from the outside.

In addition, when the formwork cannot be processed to a standard size, the formwork is cut on site and used, but in the case of the formwork of this invention, only the rigid plate inside the bag is cut to the desired size 7, and then the bag is cut to size. You can easily deal with it by loading it on your body.

〔effect〕

This invention has the following advantages because it is structured as described in (h).

■ Air bubbles and excess water in poured concrete should be removed from the holes in the sheet.
Since the water is discharged from the back holes in the rigid plate, there is no air flop, and stronger concrete can be poured.

■ Formwork production is easy because the rigid plate is loaded into a bag.

■ Since the sheets are on both the front and back sides, there is very little risk of concrete leaking when the concrete breaks.

■ It is easy to use by cutting as all you have to do is cut the rigid body inside the bag.

■ Since it is placed in a bag, a composite rigid board can be used.

■ It is easy to connect using connecting parts, or large panels can be formed by connecting in advance.

■ By connecting at the connecting part, a formwork with less leakage can be formed as a whole.

■ A bendable formwork can be formed.

[Brief explanation of the drawing]

1st PA and FIG. 2 are plan views of the formwork of the present invention, and the third figure shows the configuration (!11 side view. A: Water-permeable formwork, B: folding screen-shaped ring. 1. Bag body, 2... Reverse water hole, 3... Perforated plywood, 4...
Connecting portion, 5. Eyelet, 6. Control panel, 7. Foamed resin board. Kiyoshi Shiraki, Representative of Applied Planning, Patent Depth Co., Ltd. Proceedings Amendment (Method) February 16, 1986

Claims (6)

[Claims] (1) A concrete form made by loading a rigid and water-permeable plate into a bag whose at least one side is made of a water-permeable sheet material. (2) The concrete formwork according to claim (1), wherein the plate is made of perforated plywood. (3) Claim No. (1) characterized in that the plate is a composite of a rigid plate and a plate having open cells.
Concrete formwork described in paragraphs to (2). (4) Claims (1) to (3) characterized in that the plate has an uneven pattern on its surface.
Concrete formwork described in ). (5) The concrete formwork according to claims (1) to (4), wherein the bag is flexible. (6) The bag body is characterized by a plurality of bags connected in a row.
A concrete formwork according to claims (1) to (5).