JPH06108436A - Impervious construction in water filled ground and impervious construction method - Google Patents

Abstract

PURPOSE:To prevent the flow of a fluidized lining material placed on an impervious sheet covering the circumference of a water filled ground and to dissolve disadvantage incurred by the flow of the lining material. CONSTITUTION:Impervious construction is so executed that flow preventing projections 13 preventing the flow of a lining material 15 are provided on an impervious sheet 11 covering the circumference of a water filled ground. An execution method of the impervious construction is such that a sheet-like substance 12 having the flow preventing projections is connected to the impervious sheet 11 and that the lining material is placed after the impervious sheet is spread on the circumference.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is a water-shielding work in a landfill, especially a water-shielding with a high degree of safety to prevent outflow of harmful substances from a landfill site at a final landfill site for landfill by sea landfill. Engineering and its construction method.

[0002]

2. Description of the Related Art When constructing a final landfill site for landfill by sea landfill, as shown in FIG. 8, a caisson 2 is installed on a rubble mound 1 on the entire circumference or on the sea side to form a revetment and waste A water impervious sheet 4 is laid on the inner circumferential slope 3 of the rubble mound 1 on the side where the water is dumped to prevent harmful substances from flowing out from the inner circumferential slope 3. This impermeable sheet 4
In order to prevent sliding between the slope 3 and the slope 3, unevenness having a height of about 1 to 2 mm may be provided on the side in contact with the slope 3. Further, a protective sheet 5 made of a non-woven fabric may be laid on the water impervious sheet 4 to protect the impermeable sheet 4.
Further, the impermeable sheet 4 is fixed on the inner peripheral slope 3, and the cover soil 6 is removed from the work boat 7 in order to float the impermeable sheet due to groundwater or internal / external water pressure difference tidal current and to protect the impermeable sheet. The water blocking sheet 4 is thrown in to cover the water blocking sheet 4 by about 100 to 500 mm. As the cover soil 6, asphalt mastic, underwater concrete, or other lining material is used in addition to soil.

[0003]

As described above, the water-impermeable sheet is fixed on the slope and is placed on the water-impermeable sheet with a thickness of about 100 to 500 mm for the purpose of enhancing the safety of the water-impermeable sheet. When laying a flowable lining material such as asphalt mastic or underwater concrete directly on site, the lining material tries to flow downward on the slope after placing, but the non-woven fabric as described above, 1 to prevent slipping on the slope
The water-impermeable sheet having irregularities of 2 mm has a problem that it is almost impossible to prevent the lining material from flowing downward. Therefore, it is the actual situation that the soil is covered until 6-2, which is much larger than the soil-covering target thickness 6-1 indicated by the alternate long and short dash line in FIG. 8, becomes the actual soil-covering thickness. Therefore, if the safety factor of the lining material is calculated at the minimum thickness of the lining material, a large amount of extra lining material will be input as shown in FIG. This creates a complex disadvantage that the internal volume of the site is narrowed by the extra lining material, and the volume of waste that can be discarded is reduced accordingly.

The present invention prevents the flow of a fluid lining material placed on the water-impervious sheet covering the inner peripheral slope of the sea surface landfill, thus preventing the above-mentioned complex disadvantages. It is intended to provide a water barrier and a construction method to solve the problem.

[0005]

Means for Solving the Problems A water impervious structure of the present invention that achieves the above object is to coat a water impermeable sheet on the inner peripheral surface of a water reclaimed land, and to provide a fluid lining on the water impermeable sheet. In a water-blocking work for placing a material, a flow-preventing projection for preventing the flow of the lining material is provided on the water-blocking sheet.

The flow prevention projections may be provided directly on the water-blocking sheet, or may be provided on a sheet-like member different from the water-blocking sheet.

Further, in the construction method of the water blocking work in the water reclamation of the present invention which achieves the above-mentioned object, the sheet-like article provided with the above-mentioned fluidity-preventing projections is preliminarily arranged so that the fluid-prevention projections come upward. And the water-impervious sheet, and the water-impermeable sheet and the sheet-like material are laid together on the inner peripheral surface of a water surface landfill in water, and a lining material having fluidity from above the sheet-like material It is characterized by placing.

[0008]

The water-blocking work of the present invention coats the water-blocking sheet on the inner surface of the water reclaimed land so that the flow-preventing projections are on the upper side, and has a fluid lining on the water-blocking sheet. Place the material.
The lining material tends to flow downward on the slope after the casting, but the flow preventing projection prevents the lining material from flowing.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view schematically showing an embodiment of the water shield of the present invention, and FIG. 2 is a perspective view showing an embodiment of a flow prevention projection used in the water shield of the present invention. FIG. 4 is a cross-sectional view showing an example of a state in which the flow prevention protrusions are joined to a sheet-like material.

The caisson 2 is placed on the rubble mound 1 to form a bank for the final disposal site of waste. Rubble mound 1
The inner peripheral slope 3 is covered with a water blocking sheet 11 made of rubber, synthetic resin or the like. On the water-blocking sheet 11, a flow-preventing projection 13 fixed to a sheet-like material 12 made of a non-woven fabric, a woven cloth or a sheet having sufficient strength at a fixing portion 14 by adhesion or heat fusion is provided. It is provided so as to project above. The flow prevention protrusions 13 are made of rubber, synthetic resin, ceramics, metal or the like having a strength and hardness sufficient to prevent the flow of the lining material 15 described later. In this embodiment, the flow prevention protrusion 13 is a flow prevention portion 13-1 and a flow prevention portion 13-which are rod-shaped or plate-shaped and have a length of about 10 to 100 mm.
It is composed of a plate-shaped mounting portion 13-2 provided at one end of 1,
The attachment portion 13-2 is fixed to the sheet-like material 12. The fixing method at this time may be changed to other conceivable means such as tacks and strings. It is also possible to directly fix the flow preventing projections 13 to the water impervious sheet 11 without using the sheet-like material 12. However, in order to avoid damage to the water-blocking sheet 11, it is desirable to avoid directly fixing to the water-blocking sheet 11 and to fix to the sheet-like material 12.

On the sloped shoulder of the water-impervious sheet 11, a shoulder-shoulder pressing member 16 made of a heavy object such as a concrete block is placed, and when the lining material 15 is put on the water-impervious sheet 11,
Alternatively, it has a function of preventing the movement of the water shield sheet 11 due to an external force thereafter.

Reference numeral 15 in the drawing is a lining material made of asphalt mastic, underwater concrete, earth and sand, and the like.

Next, one embodiment of the construction method of the water-impervious construction having the above construction will be described with reference to FIGS. 4 and 5. As shown in FIG. 4, a large number of flow preventing projections 13 are formed on the sheet-like material 12.
The sheet-like material 12 is fixed in advance, and the sheet-like material 12 is bonded to the water-blocking sheet 11 by an appropriate fixing means such as adhesion, heat fusion, and bolting so that the plurality of flow-preventing projections 13 are located above. Thereafter, as shown in FIG. 5, the water-blocking sheet 1 to which the sheet-like material 12 provided with the flow-preventing projections 13 is joined.
1 is mounted on the work floating table 17, and the sheet-like material 12 and the water blocking sheet 11 are laid together from the work floating table 17 on the inner peripheral slope 3 in water.

Then, a lining material 15 having fluidity is cast on the sheet-like material 12 to complete the water-blocking work shown in FIG.

[0015]

[Modification] In the embodiment shown in FIG. 1, a string, a band, a chain, a net, a plate are provided between the flow prevention portions 13-1 of the flow prevention protrusions 13.
The flow resistance may be further increased by connecting with a rod-shaped body or the like.

The flow preventing projections are not limited to the shapes shown in FIGS. 1 to 5, but may be those having a shape capable of sufficiently preventing the flow of the lining material such as the semi-cylindrical projections 18 shown in FIG. Other shapes may be used as long as they are present. Further, as shown in FIG. 9, a plurality of protrusions 21 are provided on one plate 20, and flow preventing protrusions 23 having a net 22 stretched therebetween are arranged in a direction transverse to the flow direction of the lining material. Good.

Further, in the above-described embodiment, the flow preventing projection is formed separately from the sheet-like material 12 or the water-impervious sheet 11, and the sheet-like material 12 or the water-impervious sheet 11 is formed.
Although it is fixed to the upper portion, the present invention is not limited to this, and as shown in FIG. 7, for example, a flow preventing protrusion 19 having an appropriate shape such as a wart is formed on the sheet 12 (or the water blocking sheet 11). It may be formed integrally with the multiple sheet-shaped material 12.

Further, as a water blocking work at the joint between the structure and the water blocking sheet, when a water blocking material such as gravel or clay or earth and sand is cast only on a part of the above joint, the conventional method is used. As shown in FIG. 10, the frame 25 had to be grounded in order to prevent the water blocking material 24 from flowing out. However, as shown in FIG. If the flow-preventing projections 26, which are rod-shaped or a composite thereof, are attached, it is possible to save the labor of installing the frame 25. Note that, in FIGS. 10 and 11, reference numeral 27 indicates a profile material on the mound.

[0019]

According to the present invention, the following various effects can be obtained.
Since the flow prevention protrusion prevents the flow of the lining material, it is not necessary to add an excessive amount of the lining material over the target thickness, and the material cost and the construction cost can be reduced. Further, since the input amount of the lining material is reduced, the internal volume of the waste disposal site can be increased accordingly, and the waste disposal amount can be increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing an embodiment of a water barrier work of the present invention.

FIG. 2 is a perspective view showing an example of a flow prevention protrusion used in the water barrier of the present invention.

FIG. 3 is a cross-sectional view showing an example of a state in which the anti-flow protrusion of the present invention is bonded to a sheet-like material.

FIG. 4 is a perspective view showing a state in which a sheet-like object is attached to a water-blocking sheet in the water-blocking construction method of the present invention.

FIG. 5 is a perspective view showing a state in which a waterproof sheet is laid in the waterproofing construction method of the present invention.

FIG. 6 is a perspective view showing another example of the flow prevention protrusion used in the water barrier of the present invention.

FIG. 7 is a perspective view showing another example of the flow prevention protrusion used in the water barrier of the present invention.

FIG. 8 is a schematic cross-sectional view showing an example of a conventional water impermeable structure.

FIG. 9 is a perspective view showing still another example of the flow prevention protrusion used in the water barrier of the present invention.

FIG. 10 is a perspective view showing a water blocking work at a joint portion between a conventional structure and a water blocking sheet.

FIG. 11 is a perspective view showing a water blocking work at a joint between a structure to which the present invention is applied and a water blocking sheet.

[Explanation of symbols]

 3 Inner Circumferential Slope 11 Impermeable Sheet 12 Sheet-like Objects 13, 18, 19, 23 Flow Prevention Protrusions 15 Lining Material

Front page continued (72) Inventor Ikuo Hirose 63 Aoyanagi, Sayama-shi, Saitama 3 Shin-Sayama Heights 3-306 (72) Inventor Masayuki Tsuboi 3-5-26 Takakura, Iruma-shi, Saitama 322 (72) Inventor Miki Kondo 7-8-11 Shonandai, Fujisawa City, Kanagawa Prefecture (72) Inventor Kisoji Atsumi 1255, Kozono, Ayase City, Kanagawa Prefecture 4 Co., Ltd.

Claims (5)

[Claims] 1. A water impermeable construction in which a water impermeable sheet made of rubber or synthetic resin is coated on the inner peripheral surface of a water reclaimed land, and a fluid lining material is placed on the water impermeable sheet. Rubber, synthetic resin, metal that blocks the flow of lining material such as gravel material or concrete, clay, earth and sand on the water-blocking sheet,
A water barrier at a landfill site that is equipped with anti-flow projections made of ceramics. 2. The water shield work in a water reclaimed land according to claim 1, wherein the flow prevention projections are directly provided on the water shield sheet. 3. The water shield work in a water reclaimed land according to claim 1, wherein the flow preventing projection is provided on a sheet-like member different from the water shield sheet. 4. A sheet-like article provided with a flow-preventing projection is preliminarily combined with a water-blocking sheet such that the flow-preventing projection is located above, and the water-blocking sheet and the sheet-like article. Laid together on the inner surface of the water reclaimed land underwater,
A method of constructing a water-blocking work in a water reclaimed land, which comprises placing a lining material having fluidity on the sheet-like material. 5. A string is provided between the flow prevention portions of the flow prevention protrusions,
The water impermeable structure according to claim 1, wherein the water impermeable structure is connected by a band, a chain, a net, a plate, a rod-shaped body or the like.