JPH083962A - Block mat for prevention of erosion - Google Patents

Abstract

PURPOSE:To increase adhesion effect of blocks to a sheet material and prevent mal-effects of the sheet material on soil, by interposing an adhesive non- vulcanized rubber between the underface of the block and the upper face of the sheet material. CONSTITUTION:Blocks 2 are stuck on a sheet material 1 with an adhesive as a group. Non-vulcanized butyl rubber 3 is used as the adhesive to increase the adhesive effect on the sheet. Next, a plurality of blocks 2 are rranged on the sheet 1. A number of parts are laid down both lengthwise and crosswise so that the horizontal rotary support protrusion 22 is superposed with the horizontal rotary support groove 21 in the adjacent parts to construct a continuous erosion-proof structure by a number of blocks 2. The sheet material 1 is made of polypropylene sheet having (1-100)X10<-2>cm/sec in permeability coefficient in order to retain the quality of soil coating the sheet 1, suitable for plant and underground microbes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to coastal and river embankments,
The present invention relates to a block mat used for preventing erosion of ground surfaces such as slopes of roads and railways, and more particularly to a block mat capable of being efficiently laid by a machine.

[0002]

2. Description of the Related Art Conventionally, as a preventive measure against erosion of earth and sand caused by the flow of waves and water, Japanese Patent Publication No. 2-384.
As described in Japanese Patent Publication No. 5, a required number of blocks formed in mutually connectable shapes are mutually connected, and the blocks are preliminarily adhered to a sheet-like object, and this is installed at a place such as a beach where erosion prevention is required. The method of laying it is adopted.

In this method, the sheet itself to which the concrete block is adhered is not suspended, but the center of gravity of each of the required number of blocks is grasped by suspension fittings and the block and the sheet-like object are suspended and moved. And because it is lowered, stress is not applied to the sheet-like object, so it can be applied to the open sea part where large concrete blocks are required and the coastal part where the waves are rough, etc. it can.

[0004]

The block mat used in this laying method connects blocks formed into shapes that can be connected to each other, utilizes the bonding force due to the connection between the blocks, and connects the blocks together. Is formed by adhering to a sheet-like material with an adhesive.

In this block mat, as the adhesive for adhering the block to the sheet-like material, conventionally,
Epoxy resin is used, this product does not have sufficient bonding strength, and although the sheet itself has water permeability and air permeability, water permeability between the coated soil on the upper side of the sheet and the soil on the lower side of the sheet, There is a drawback that the filtering action by aeration functions only slightly and the covering soil on the upper side of the sheet is not suitable for planting and the presence of underground microorganisms.

The present invention solves the above-mentioned drawbacks of the conventional block mats, and its purpose is to enhance the effect of adhering the block to the sheet-like material and to minimize the adverse effect of the sheet-like material on the soil. Especially.

[0007]

In order to achieve the above object, the erosion preventive block mat of the present invention comprises a block group in which a plurality of blocks having connecting portions which can be connected to each other are connected to each other, and an upper surface of the sheet-like article. In the erosion preventive block mat arranged in (1), an unvulcanized rubber for adhesion is interposed between the lower surface of the block and the upper surface of the sheet-like material.

Here, butyl rubber is preferable as the non-vulcanized rubber for adhesion. The sheet-like material is preferably a polypropylene-based synthetic resin sheet having a water permeability coefficient of 1 to 100 × 10 ^-2 cm / sec. If the hydraulic conductivity is less than 1 × 10 ^-2 cm / sec, it will be difficult for the plants to grow, and if the hydraulic conductivity is more than 100 × 10 ^-2 cm / sec, it will cause spillage during flooding. Various synthetic resins can be used as the material of the sheet, but polypropylene-based synthetic resins are preferable.

[0009]

[Function] The non-vulcanizable rubber (butyl rubber) for adhesion, which is interposed between the lower surface of the block and the upper surface of the sheet-like material, has a characteristic of an adhesive force of about 2 kg / cm ² and has a high adhesive strength. Especially, the adhesive strength can be effectively exhibited depending on the weight of the block, and the decrease in the adhesive strength is small even in the soil or water for a long period of time. Furthermore, it does not adversely affect soil and water quality.

The water permeability coefficient is 1 to 100 × 10 ^-2 cm.
/ Sec polypropylene synthetic resin sheet not only plays the original role of the sheet-shaped material in preventing back-filling of sand and sand, but also the coated soil on the sheet-shaped material by the filtering action by water permeation and aeration. To maintain soil quality suitable for planting and presence of subterranean microorganisms.

[0011]

FIG. 1 is a partially cutaway perspective view showing an embodiment in which the erosion preventing block mat of the present invention is applied to a river bank, and FIG. 2 is a plan view showing an example of parts of the block mat. 3 is a partial sectional view of the block mat.

In FIG. 1 to FIG. 3, 1 is a sheet-like material, and 2 is a concrete block arranged on the sheet-like material 1. The shape of the block 2 is the above-mentioned Japanese Patent Publication No. 2-
Similar to the block described in Japanese Patent No. 3845, it has a groove 21 for horizontal rotation bearing on the upper surface of one end and a projection 22 for horizontal rotation bearing on the lower surface of the other end, which are adjacent to each other. The horizontal rotation bearing projection 22 and the horizontal rotation bearing groove portion 21 are rotatably and overlappingly engaged with each other.

With this structure, each block 2 can rotate in the vertical direction at a sufficient angle with respect to the adjacent block 2. Further, since the horizontal rotation bearing projection 22 is supported in the horizontal rotation bearing groove portion 21 in a superposed state, each block 2 is integrated with the adjacent block 2 and can be prevented from being depressed alone.

When these blocks 2 are attached to the sheet-like material 1, the blocks 2 are interconnected and the bonding force of the connection is utilized, and the block 2 is attached to the sheet-like material 1.
And are bonded with an adhesive.

An unvulcanized butyl rubber 3 is used as the adhesive. Butyl rubber 3 has a large adhesive strength between the block 2 and the sheet-like material 1 as an adhesive used for a block mat to be buried in water or soil, and is particularly deformed by the weight of the block 2 to make the adhesive force more effective. Can be demonstrated. In addition, the adhesive strength has a small decrease even in soil or water for a long period of time, and further has an excellent advantage that it does not adversely affect soil and water quality.

The butyl rubber 3 is attached to each of the parts 4 as shown in FIG. 2 at the block disposition position on the upper surface of the sheet-like material 1. In FIG. 2, the shaded portion is butyl rubber 3
Is the part to which is attached. The shaded portion a is for bonding the block 2 arranged on this part 4, and the shaded portions b and c
Is for bonding a block (indicated by a one-dot chain line in the figure) arranged on a part that is laid adjacently during construction.

The sheet-like material 1 is a synthetic resin sheet in which polypropylene-based yarns are woven, and in this embodiment, the thickness is about 1.5 mm and the water permeability coefficient is 6.79 × 10 ^-2 cm /.
It is a sec sheet. The sheet-like material 1 has a function of fixing the block 2 at a predetermined position and a function of preventing the back and forth soil from being sucked out by a gentle slope revetment or the like. Furthermore, since it has suitable water permeability, after laying a block mat, the soil soil suitable for planting the cover soil on the sheet-like material 1 and for the presence of underground microorganisms by water filtration and filtration by aeration. Demonstrate the function of maintaining.

In the case of the part 4 illustrated in FIG. 2, six blocks 2 are arranged on one sheet-like object 1, and the part 4 is used for horizontally rotating bearings with the blocks of adjacent parts. By laying a large number of the projections 22 and the horizontal rotation bearing groove 21 in a superposed state, the erosion preventing structure in which a large number of blocks 2 are connected is constructed as a whole as shown in FIG.

Next, a method of laying the above-mentioned block mat will be described with reference to FIG. 4 which is a perspective view showing a working state of laying the parts of FIG. As shown in the same figure, a suspension tool 5 in which block clamps 42 are provided at intervals of the blocks 2 on a support frame 41 assembled from an angle member or the like is used, and the block clamps 42 are used as parts of the block mat shown in FIG. The parts 4 are transported by grasping the center of gravity of each block 2 of 4 and lifting the lifting tool 5 with a wire by a crane truck. According to such a transportation method, the load of the block 2 does not act on the sheet-like material 1, so that the block 2 can be made large, and thus the large external force of waves or water can be resisted. It is possible to select a proper weight.

When a large number of parts 4 are laid, the horizontal rotation bearing projections 22 and the horizontal rotation bearing groove portions 21 of each block 2 of the part 4 and the block 2 of another part 4 which are laid first are in a superposed state. In this way, the blocks 2 are sequentially connected. In this way, after laying a large number of parts 4, the top surface of the block is entirely covered with soil, or only the voids between the blocks are filled with soil to grow plants naturally or artificially. However, it is possible to construct an erosion prevention structure over a wide area without disturbing the natural environment and the landscape as shown in FIG.

[0021]

According to the present invention, the following effects can be obtained.

(1) Since the block is adhered to the sheet-like material by using butyl rubber, which has a high adhesive strength and has a small decrease in adhesive strength even in soil or water, after the block mat is laid, it is possible to use it for a long period of time. The block and sheet will not be separated.

(2) The adhesive does not adversely affect soil quality and water quality, and a good biological environment can be maintained.

(3) In addition to the original function of the sheet-like material to prevent the back-filling of soil and sand from being sucked out, the sheet-like material having an appropriate coefficient of water permeability is coated on the sheet-like material by a filtering action by water permeation and aeration. The soil can be maintained in a soil quality suitable for planting and the presence of underground microorganisms, and a good biological environment can be maintained.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment in which a block mat for erosion prevention according to the present invention is applied to a river bank.

FIG. 2 is a plan view showing parts of the block mat shown in FIG.

FIG. 3 is a partial cross-sectional view of the block mat shown in FIG.

FIG. 4 is a perspective view showing a work state of laying the parts shown in FIG.

[Explanation of symbols]

 1 Sheet-like object 2 Block 3 Unvulcanized butyl rubber 4 Block mat parts 5 Lifting tool 21 Horizontal rotation bearing groove 22 Horizontal rotation bearing projection 41 Support frame 42 Block clamp

Claims (3)

[Claims] 1. An erosion prevention block mat in which a block group in which a plurality of blocks having mutually connectable connecting portions are connected to each other is provided on an upper surface of a sheet-like object, wherein a lower surface of the block and an upper surface of the sheet-like object are provided. An erosion-preventing block mat having a non-vulcanized rubber for adhesion interposed between the block mat and the block mat. 2. The block mat for erosion prevention according to claim 1, wherein the non-vulcanized rubber for adhesion is butyl rubber. 3. The sheet material has a water permeability coefficient of 1 to 10.
The block mat for erosion prevention according to claim 1 or 2, which is a polypropylene-based synthetic resin sheet having a density of 0 × 10 ^-2 cm / sec.