JPH04194209A - Sheet formwork material - Google Patents

Abstract

PURPOSE:To prevent a fall of watertightness by laminating a rubber-like elastic sheet of laminated body of rubber and synthetic resin, and synthetic fiber cloth, fixedly securing in one body, and forming cavities between both for press fitting fluidal concrete, mortar, or the like. CONSTITUTION:A rubber-like elastic body sheet 1 made of polypropylene and a synthetic resin cloth 2 made of polypropylene fiber are laminated, fixedly securing positions at regular intervals are stuck into one body, and hence a sheet formwork material A is formed. The rubber-like elastic body sheet 1 is arranged and laid on the slope face side of the sheet formwork material A, and concrete 4 is enclosed between two layers, the rubber-like elastic body sheet 1 and the synthetic resin cloth 2. After press fitting, surplus water is oozed out through the synthetic fiber cloth 2 and let flow down to form a concrete surface. Hereby, a protecting wall made of concrete is formed and a waterproof function can be obtained.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to formwork materials for forming concrete mats, concrete walls, etc. by press-fitting fluid concrete or mortar with a pump, etc. The present invention relates to sheet formwork materials for forming concrete plates with waterproof function for use on slopes of waste disposal sites, embankments, etc.

(Prior art) In recent years, in order to protect the slopes of dams, rivers, artificial ponds, reservoirs, etc., fiber cloth made of double woven nylon cloth has been used, and this bag-like cloth is used as a formwork. Many methods have come to be seen in which the bag is filled with fluid concrete or mortar, water is allowed to flow down through the grains of the bag, and the concrete or the like is hardened inside the bag to form a wall.

This construction method can form a concrete protection surface even on slopes with a considerable inclination angle, and compared to conventional block construction methods and cast-in-place concrete, construction is faster, labor-saving, and
It is highly economical.

(Problem) However, these upper and lower two layers of synthetic fiber cloth are tied at regular intervals and with a constant thread length to form a formwork, but in this case, the binding threads do not stretch after being filled with mortar, etc. Because of this, it becomes constricted and becomes thinner, which tends to impair watertightness.

Furthermore, when an external load is applied, the mortar of the joint has the disadvantage that it tends to crack.

Once cracks occur in this way, watertightness is naturally lost.

When concrete mats are installed using conventional construction methods at industrial waste treatment plants, etc., if racks like this are inserted into the joints, water leakage will cause problems such as contamination of groundwater, loss of water storage, etc. .

In addition, when used for a river bank, if a crack occurs in the joint, erosion or suction of the backside earth and sand at the Kutulav area will begin, leading to a major disaster.

(Objective) The present invention was made in order to meet the above-mentioned needs, and an object of the present invention is to provide a sheet formwork material having a waterproof function.

(Solution Means) In order to achieve the above object, the present invention employs the following solution means.

That is, the present invention consists of a synthetic fiber cloth and a rubber-like elastic sheet, which are laminated and fixed to each other at desired locations to integrate them, and a cavity for press-fitting fluid concrete, mortar, etc. is formed between the two layers. A sheet formwork material characterized in that the rubber-like elastic sheet is preferably a laminate of rubber and synthetic resin, and the rubber-like elastic sheet is reinforced with fiber cloth. To provide formwork materials.

As the synthetic fiber cloth used here, woven fabrics made of polyethylene, polypropylene, nylon, and polyester are preferably used, and woven nylon fabric is particularly preferred because of its excellent properties such as tear strength and antiseptic properties. .

The rubber-like elastic sheet used here may be of course a rubber sheet, but may also be a rubber-like synthetic resin, or may even have a two-layer structure in which these are laminated.

As such a rubber-like elastic sheet, a flexible sheet with weather resistance is preferable, and examples of rubber-based sheets include butyl rubber, E
The sheet is made of PDM, CR%PrB, etc., and as the synthetic resin sheet, a rubber-like sheet such as PVC, EVA, PE, etc. can be used.

As means for fixing the synthetic fiber cloth and the rubber-like elastic sheet, bonding strips that join the two layers at regular intervals, thermal welding of the two layers, hot melt, or adhesives are used. It is not limited to this.

In the former case, it is suitable for producing thick concrete plates or high-strength concrete plates, and in the latter case, it is suitable for producing relatively thin concrete plates.

When fixing these two layers, it is also possible to interpose a steel cable, nylon rope, etc. in the middle and fix them, and these cables and openings are only used to make it easier to install on slopes. Rather, it prevents unnecessary deformation when concrete is press-fitted, and serves as a core after the concrete wall is completed.

(Function) The present invention has the above-mentioned configuration, and concrete is press-fitted between the two layers by laying a rubber-like elastic sheet on the slope side, and after press-fitting, excess water is drained away by synthetic fiber cloth. More leaching flows down and a concrete surface is formed.

A rubber-like elastic sheet is placed on the slope side to maintain watertightness, and groundwater from the slope side is blocked by this sheet and does not seep out, while water on the concrete side is also There is no seepage into the soil, which is blocked by a similar elastic sheet and forms a slope.

In addition, when higher watertight reliability is required, a rubber-like elastic sheet form material is suitable for both the upper and lower layers. In this case, since both layers are water-impermeable sheets, a method is used in which bed holes are provided and after the filled mortar or the like is cured, a patch is applied to ensure watertightness.

Therefore, for example, when the sheet formwork material of the present invention is used for the revetment of an artificial pond, the stored water will be blocked by the rubber-like elastic sheet and will not leak into the soil (on the other hand, it will not leak into the soil). This also prevents harmful substances from entering the water.

That is, the sheet formwork material of the present invention not only forms a concrete wall for protecting slopes, etc., but also provides a waterproof (water-blocking) function.

(Concrete example) The present invention will be further explained below using specific examples.

FIG. 1 is a partially cutaway perspective view of a sheet formwork material A of the present invention, in which reference numeral 1 is a sheet made of polypropylene, and 2 is a sheet made of polypropylene.
is a woven fabric made of polypropylene fibers. And 20c
The two are integrated by adhering them every m by hot melt.

Figure 2 shows a part of a concrete wall formed by press-fitting the fluid concrete 4 into the sheet formwork material of Figure 1 using a pump. However, the back side is a water-impermeable sheet 1, and the presence of this sheet 1 provides a water-blocking effect.

(Effects) Since the present invention employs the above configuration, it is possible to form a protective wall made of concrete and at the same time have a waterproof (water-shielding) function. Therefore, it is a sheet formwork material most suitable for civil engineering work where water should not seep into or from the soil, and its utility value is high.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of the sheet formwork material of the present invention;
FIG. 2 is a cross-sectional perspective view showing a part of a concrete wall formed by press-fitting fluid concrete into the sheet form material of FIG. 1. Explanation of symbols A...Sheet formwork material 1...Rubber-like elastic sheet 2...Synthetic resin cloth 3...Fixed portion 4... ···concrete

Claims (3)

[Claims] (1) Made of synthetic fiber cloth and rubber-like elastic sheet, these are laminated and fixed to each other at desired locations to form a cavity between these two layers for press-fitting fluid concrete, mortar, etc. A sheet formwork material that is characterized by: (2) A sheet formwork material in which the rubber-like elastic sheet is a laminate of rubber and synthetic resin. (3) A sheet formwork material in which the rubber-like elastic sheet is reinforced with fiber cloth.