JPH0348254Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a fabric formwork used for pouring concrete such as concrete and mortar.

Problems that the invention aims to solve When forming a concrete pine over a large area by laying fabric formwork on the ground surface and pouring concrete, the concrete pine is constructed using fabric formwork as a unit. The formwork was designed to be 10m wide, and since the joints were made in units of this width, discontinuities were created at the joints. When using concrete pine to prevent erosion of slopes, this discontinuous part promotes the suction of earth and sand from the back of the pine, so it was necessary to lay a suction prevention cloth under the joint.

That is, as shown in Fig. 4 a, b, and c, when laying the cloth formwork 1, the suction prevention cloth 2 is stretched around the lower edge of the formwork by about 1/2 of its width to the outer periphery of the formwork. Let it come out and lay it down. After pouring concrete 3 into this fabric formwork 1, the fabric formwork 1' to be jointed adjacently is laid on the suction prevention cloth 2, the concrete 3 is poured, and the suction prevention cloth 2 is laid on the underside of the joint. It was crowded to form concrete mats 4,4.

With such conventional means, the suction prevention cloth tends to shift during concrete pouring work, resulting in insufficient suction prevention function. Furthermore, in the case of underwater construction, it is more likely to shift due to water currents, waves, etc., making it difficult to achieve a reliable suction prevention function.

This idea was created by focusing on the above-mentioned problems. The purpose is to propose a fabric formwork that can reliably prevent the suction of earth and sand from the joints, improve workability in construction, and reduce material costs.

Structure and implementation examples of the idea This will be explained below with reference to the illustrated embodiments.

In Figures 1 and 2, the cloth formwork 1 of this invention is shown.
In this method, the peripheral edges 6 of two layers of rectangular nylon fabrics 5, 5 on the front and back sides are closed to form a bag shape, and concrete such as concrete or mortar is poured and placed inside. A long band-shaped suction prevention cloth 2 is sewn to one edge in the width direction of the fabric 5 of the back layer of the form 1, and its tip in the width direction extends outside the form 1.

Further, drains 7 (also referred to as filter points), which are formed by weaving two layers of fabric 5, 5 on the front and back sides, in a single layer, are formed in the form 1 at predetermined intervals. In addition, in order to control the thickness of concrete poured into the formwork, in addition to drainage, means such as binding ropes may be provided between the front and back fabrics. For this purpose, irregularities at predetermined intervals are usually formed on the surface of the constructed concrete pine. Further, this formwork is provided with three rows of three injection ports 8 arranged in parallel in the vertical direction. (Only a part of the injection port is shown in FIG. 2.) This mold frame 1 made of fabric has the above-mentioned structure. After this formwork 1 is laid and concrete is injected from the injection port 8 provided on the surface layer, when a new formwork is laid adjacent to this, the suction prevention cloth 2 laid between the two formworks is By fixing the concrete to the edge of the backing fabric of the formwork into which one concrete is poured, it can be easily and accurately laid between the formworks, and it will not shift during work or be disturbed by waves, etc. As shown in FIG. 3, concrete mats 4, 4 can be formed by accurately placing the suction prevention cloth 2 in between.

The suction prevention cloth is a woven fabric with a weave density that does not allow dirt particles to pass through, and is preferably made of synthetic fibers that do not easily corrode, such as nylon or polyester. width
Approximately 1m wide for a 10m standard fabric formwork
A strip-shaped suction prevention cloth is attached. In addition to sewing, it can be attached by any method such as staples or adhesive.

Effects of the idea This idea is as described above. In this fabric formwork, the suction prevention cloth to be laid in the formwork is fixed to the formwork, so it can be laid easily and accurately, and is unlikely to be disturbed by worker carelessness, wind, water flow, etc. Also,
Since it can be laid accurately, there is no need to make the width unnecessarily wide, and the width can be halved compared to conventional methods.

Therefore, with this fabric formwork, it is possible to reliably prevent earth and sand from being sucked out and to reduce construction costs and material costs.

[Brief explanation of the drawing]

Figures 1 and 2 are a longitudinal sectional view and a plan view of the edge of the fabric formwork of the example, Figure 3 is a longitudinal sectional view of a concrete pine formed by laying this fabric formwork adjacent to each other, and Figure 4 is a longitudinal sectional view of the edge of the fabric formwork of the example. Figures a, b, and c are sectional views sequentially showing the steps of laying a conventional suction prevention cloth to form a concrete mat. 1... Fabric formwork, 2... Suction prevention cloth, 3...
...Concrete, 4...Concrete pine, 5
... Nylon fabric, 6 ... Periphery, 7 ... Water drain, 8 ... Inlet.

Claims (1)

[Scope of utility model registration request] In a cloth formwork for pouring concrete, which is formed by closing the peripheries of two layers of fabric on the front and back sides and forming a bag-like shape, a suction prevention cloth that extends outside the formwork along the edge of the back layer fabric is fixed. A fabric formwork characterized by the fact that it is