Rainfall countermeasure method of impervious layer construction

Abstract

To provide a rainfall countermeasure method of impervious layer construction which can cope with bad weather when the impervious layer is constructed.SOLUTION: A rainfall countermeasure method of impervious layer construction installs a roof part 3 having an impervious sheet 32 above a construction site A where an impervious layer 1 is constructed, constructs the impervious layer 1 containing bentonite mixed soil in the construction site A, lays the impervious sheet 32 above the impervious layer 1, and when installing a roof part 3 above the construction site A, erects a plurality of supports 31, supports the impervious sheet 32 by the plurality of supports 31, and connects the edge part of the impervious sheet 32 to a stretched cable 36.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for constructing a water barrier layer against rainfall. [Background technology]

[0002] Conventionally, final disposal sites for general waste, industrial waste, etc. have been required to install surface or vertical water barriers as a measure to prevent contamination of public water bodies and groundwater by leachate from landfill sites.

[0003] For surface waterproofing works, the following three double waterproofing structures (1) to (3) are specified: (1) Placing clay on top of the permeable layer, then placing a waterproof sheet and a protective mat on top of that, and then placing protective soil; (2) Placing watertight asphalt concrete on top of the permeable layer, then placing a waterproof sheet and a protective mat on top of that, and then placing protective soil; (3) Placing a protective mat and permeable sheet on top of the permeable layer, then placing an intermediate protective layer made of a protective mat or sand on top of that, then placing a waterproof sheet and a protective mat on top of that, and then placing protective soil.

[0004] In recent years, there have been cases where bentonite mixed soil, which is expected to have a water-stopping effect due to its self-repairing properties, has been used instead of clayey soil (see Patent Document 1 below). Because bentonite swells when it comes into contact with water, it is desirable to prevent infiltration by rainfall when mixing the bentonite with locally generated soil on-site or during construction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-020161 Summary of the Invention [Problem to be solved by the invention]

[0006] However, even if construction is carried out while protecting the structure with a waterproof sheet, there is a problem in that it is difficult to respond to sudden changes in weather.

[0007] Therefore, the present invention has been made in consideration of the above circumstances, and provides a method for dealing with rainfall in constructing a waterproof layer, which can cope with worsening weather conditions when constructing the waterproof layer. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention employs the following means. That is, the rainfall countermeasure method for constructing a waterproof layer according to the present invention involves installing a roof section having a waterproof sheet above the construction site where the waterproof layer is to be constructed, constructing the waterproof layer containing bentonite-mixed soil at the construction site, and laying the waterproof sheet on top of the waterproof layer.

[0009] In this rainfall countermeasure method for constructing a water impermeable layer, the installation of the roof section prevents rainwater from splashing on the bentonite-mixed soil when mixing the bentonite-mixed soil, during construction, etc., making it possible to respond to adverse weather conditions. Furthermore, after the water impermeable layer is constructed, the waterproof sheet of the roof section is laid directly on top of the water impermeable layer, which contributes to reducing on-site work and shortening the construction period.

[0010] In addition, in the rainfall countermeasure method for constructing a waterproof layer according to the present invention, when the roof portion is installed above the construction site, multiple pillars may be erected, the waterproof sheet may be supported by the multiple pillars, and the edge of the waterproof sheet may be connected to a tensioned cable.

[0011] In this rainfall protection method for constructing a waterproof layer, the waterproof sheet can be maintained at a height above the waterproof layer by the supports, and the waterproof sheet can be maintained in a taut state by the cables.

[0012] In the method for constructing a water-impermeable layer as a measure against rainfall according to the present invention, the water-impermeable sheet may be formed by heat-welding a plurality of divided water-impermeable sheets together.

[0013] In this rainfall countermeasure method for constructing a water-impermeable layer, the water-impermeable sheet is formed by heat-welding a plurality of divided water-impermeable sheets together, which makes it possible to easily manufacture water-impermeable sheets of various sizes. [Effects of the Invention]

[0014] According to the method for constructing a water shielding layer to cope with rainfall in accordance with the present invention, it is possible to cope with worsening weather conditions when constructing the water shielding layer. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing one step of a method for constructing a water shielding layer as a rainfall countermeasure according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing a step subsequent to the step shown in FIG. [Figure 3] FIG. 1 is a schematic diagram of a waterproof sheet. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, a rainfall countermeasure method for constructing a water shielding layer according to one embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 are schematic diagrams showing one step of a method for constructing a water shielding layer as a measure against rainfall according to one embodiment of the present invention, and Figure 2 shows a step subsequent to Figure 1. Figure 3 is a schematic diagram of a water shielding sheet. As shown in FIG. 1, the rainfall countermeasure method for constructing a water shield layer according to this embodiment is a rainfall countermeasure method when constructing a water shield layer 1 at a final disposal site for general waste, industrial waste, etc.

[0017] At construction site A where the water-impermeable layer 1 is to be constructed, before the water-impermeable layer 1 is constructed above the water-permeable layer 2, the roof section 3 is constructed above the water-permeable layer 2. The roof section 3 has a plurality of supports 31, a water-impermeable sheet 32, and a plurality of cables 36.

[0018] A plurality of support pillars 31 are erected on the ground G on the outer periphery side of the construction site A. For example, the plurality of support pillars 31 are installed on the outer periphery side of the construction site A so as to surround the construction site A.

[0019] As shown in Figure 3, the waterproof sheet 32 ​​is formed in a rectangular shape in a plan view. The shape of the waterproof sheet 32 ​​can be set as appropriate. The waterproof sheet 32 ​​has a plurality of divided sheets 33 that are waterproof. The waterproof sheet 32 ​​is formed by arranging a plurality of sheets 33 vertically and horizontally and heat welding adjacent sheets 33 to each other. This makes it possible to realize a waterproof sheet 32 ​​of a large size.

[0020] As shown in Fig. 1, the waterproof sheet 32 ​​is supported by a plurality of supports 31. For example, the edge 32a of the waterproof sheet 32 ​​is supported by the upper end of the supports 31. The locations where the waterproof sheet 32 ​​is supported and the locations where it is supported by the supports 31 can be set as appropriate.

[0021] The multiple cables 36 are connected to the edge 32a of the waterproof sheet 32. One end 36a of each of the multiple cables 36 is connected to the edge 32a of the waterproof sheet 32, and the other end 36b is fixed to the ground G. The multiple cables 36 are tensioned. As a result, the waterproof sheet 32 ​​is maintained at a height above the waterproof layer 1 by the supports 31, and is maintained in a tensioned state by the multiple cables 36.

[0022] With the roof portion 3 installed above the permeable layer 2, the water shielding layer 1 containing bentonite mixed soil is constructed above the permeable layer 2.

[0023] After constructing the water-impermeable layer 1, the water-impermeable sheet 32 ​​is laid on top of the water-impermeable layer 1. The water-impermeable sheet 32 ​​is detached from the multiple cables 36, and the water-impermeable sheet 32 ​​is lowered on top of the water-impermeable layer 1. The supports 31 and the cables 36 are removed.

[0024] In the rainfall countermeasure method for constructing a water impermeable layer configured as described above, the installation of the roof portion 3 can prevent rainwater from splashing on the bentonite-mixed soil when mixing the bentonite-mixed soil or during construction, thereby making it possible to deal with worsening weather. Furthermore, after the water impermeable layer 1 is constructed, the water impermeable sheet 32 ​​of the roof portion 3 is laid directly on top of the water impermeable layer 1, which can contribute to reducing on-site work and shortening the construction period.

[0025] Furthermore, the waterproof sheet 32 ​​can be maintained at a height above the waterproof layer 1 by the supports 31, and the waterproof sheet 32 ​​can be maintained in a taut state by the cables 36.

[0026] Furthermore, the waterproof sheet 32 ​​is formed by heat-welding a plurality of divided waterproof sheets 33 together, so that waterproof sheets 32 of various sizes can be easily manufactured.

[0027] The shapes and combinations of the components shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention.

[0028] For example, in the embodiment described above, the roof portion 3 has the support posts 31 and the cables 36, but is not limited to this. The roof portion 3 only needs to have at least the waterproof sheet 32.

[0029] Furthermore, in the embodiment described above, the waterproof sheet 32 ​​is formed by heat-welding a plurality of waterproof sheets 33, but this is not limited to this. The waterproof sheet 32 ​​may be formed from a single sheet rather than being formed from a plurality of divided sheets 33. Furthermore, the plurality of sheets 33 may be connected by a method other than heat-welding.

[0030] The Sustainable Development Goals (SDGs) are 17 international goals adopted at the United Nations Summit in September 2015. The rainfall countermeasure method for constructing a water-impermeable layer according to this embodiment can contribute to achieving one of the 17 SDGs, for example, goal 9, "Build resilient infrastructure, promote inclusive and sustainable industrialization, and foster innovation." [Explanation of symbols]

[0031] 1. Water impermeable layer 3 Roof 31 Post 32 Waterproof sheet 32a Edge 33 seats 36 Cable A Construction site

Claims

1. A roof with a waterproof sheet is installed above the construction site where the waterproof layer will be constructed. Constructing the water impermeable layer containing bentonite mixed soil at the construction site, A method for constructing a waterproof layer to protect against rainfall, comprising laying the waterproof sheet on top of the waterproof layer.

2. When installing the roof portion above the construction site, 2. A method for constructing a waterproof layer to protect against rainfall according to claim 1, wherein a plurality of supports are erected, the waterproof sheet is supported by the plurality of supports, and the edges of the waterproof sheet are connected to tensioned cables.

3. 3. The method for constructing a water-impermeable layer as a rain countermeasure according to claim 1, wherein the water-impermeable sheet is formed by heat-welding a plurality of divided water-impermeable sheets together.

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