JP7182451B2 - Water-shielding structure of the landfill area of the sea surface disposal site - Google Patents

Description

The present invention relates to a water-shielding structure for a landfill area of a sea surface disposal site. It relates to a water-shielding structure of a sea surface disposal site landfill area that can reliably perform water-shielding between.

Conventionally, sea surface final disposal sites for general waste and industrial waste have been constructed by partitioning them with multiple caissons, cells, or other revetment structures, each of which has a water-impervious structure at the joints, in order to construct a water-impermeable embankment. there is On the side of these landfill areas, impermeable sheets, etc. are installed in order to prevent retained water from seeping into the surrounding sea and land areas from the controlled final waste disposal site surrounded by the revetment structure and foundation ground after service. Various waterproof structures have been constructed.

The basic structure of these impervious structures is described in the “Ministerial Ordinance for Establishing Technical Standards for Final Disposal Sites for Municipal Waste and Final Disposal Sites for Industrial Waste (hereafter, Ministerial Ordinance)” (Non-Patent Document 1). is clearly indicated. The example of FIG. 10 is a schematic cross-sectional view showing a state in which landfilling with wastes 70 is completed in a sea surface disposal site 50 constructed by a caisson-type mixed embankment. A caisson 54 is installed on a riprap mound 53 built on an impermeable stratum 52 as a bank protection structure for partitioning the landfill area 51 that will become the sea surface disposal site 50 . A first-layer waterproof sheet 60 is laid along. A backfilling work 61 having a predetermined thickness is constructed on the first layer of water impermeable sheet 60, a second layer of water impervious sheet 62 is laid thereon, and furthermore a pressing rubble 63 is formed so as to cover the entirety of the second layer of impermeable sheet 62. is constructed. Waste 70 to be landfilled is carried and deposited in this landfill area. Ultimately, as shown in FIG. 10, after landfilling with a planned amount of waste 70 is completed, the surface layer is covered with soil generated from construction, which is carried in soil 71 . FIG. 11 shows an example of a structure in which the lower end of a waterproof sheet adheres to an impermeable stratum as a double waterproof structure defined in the conventional technical standards. Both the first-layer waterproof sheet 60 and the double-layer waterproof sheet 62 have the same adhesion structure.

By the way, in a sea surface disposal site, a landfill revetment structure is constructed as a controlled waste landfill revetment in which a seepage control work is added. Therefore, in accordance with the purpose of the standard ministerial ordinance, as a design guideline that takes into consideration the characteristics of the sea surface disposal site, the "Controlled Waste Landfill Revetment Design, Construction and Management Manual (Revised Edition)" (hereinafter referred to as the design, construction and management manual, In August 2008, published by the Research Center for Advanced Environment of Harbor Spaces). In this design/construction/management manual, the lower ends of the above-described impermeable sheets 60 and 62 are the impermeable stratum 52 as the seabed or the surface of impermeable foundation such as deep mixed treated soil (CDM). It is stipulated that the structure should be laid in close contact with each other for a laying length L1 of 5 m or more. Also, the ends 60a, 62a of the impervious sheet are designed to be positioned within the asphalt mastic packing layer 66 to ensure its stability.

Environment Agency Laws, Notices, and Notices, “Ministerial Ordinance to Establish Technical Standards for Final Disposal Sites for Municipal Waste and Final Disposal Sites for Industrial Waste”, [online], revised on July 16, 1998, Ministry of the Environment , [Searched on September 18, 2018], Internet <URL: http://elaws.e-gov.go.jp/search/elawsSearch/elaws_search/lsg0500/detail?lawId=352M50000102001&openerCode=1>

In the design of impermeable work for bank protection structures based on conventional standard ordinances and design/construction/management manuals, as shown in Figs. Almost the same process must be repeated accordingly. In addition, a back-filling work 61 having a predetermined layer thickness must be constructed between the first-layer waterproof sheet 60 and the second-layer waterproof sheet 62 . Therefore, the construction of impervious sheets and the backfilling work involve a large number of processes and a large amount of construction work, which poses problems of lengthening the construction period and increasing construction costs.

By the way, the asphalt mastic filling layer 66 in which the ends of the impervious sheets 60 and 62 are held is solidified by the fluidized asphalt mastic filled in the compartments surrounded by the concrete blocks 67 and 67 as partition forms. It was formed by At this time, the adhesion length (penetration path length) L2 in the asphalt mastic filling layer 66 is the impermeable stratum (thickness of 5 m or more and hydraulic conductivity of 1 × 10 ^-5 cm / sec or less) indicated in the experiment or the standard ministerial ordinance. The length obtained by multiplying the required adhesion length designed to have the same penetration time as the safety factor (for example, L2 = 1.25 m = required adhesion length (required penetration path length) 0.5 m × safety factor 2.5) It was recognized that

Therefore, regarding the adhesion length between the impermeable sheets 60 and 62 and the impermeable stratum 52 or the surface of impermeable base such as deep mixed treated soil (C.D.M.), the thin asphalt mastic adhesion layer 64 is formed between them. , 65, it is possible to shorten the above-described laying length L1.

Therefore, the object of the present invention is to provide a water impermeable sheet for laying two layers of impermeable sheets as multiple impermeable layers as a future effective countermeasure for solving the problems of the conventional technology described above. By forming an asphalt mastic layer between the impermeable sheet laid on the impermeable base such as the surface of the stratum, it becomes possible to reduce the conventional two asphalt mastic layers to one, reducing the construction period and construction time. To provide an impervious structure for a landfill area of a sea surface disposal site, which is constructed by constructing a structure meeting prescribed technical standards while greatly suppressing costs.

In order to achieve the above object, the impermeable structure for the landfill area of the sea surface disposal site of the present invention covers the slope of the backfill work of the revetment structure constructed so as to partition the landfill area for the sea surface disposal site. A lower impermeable sheet having a lower end in close contact with the impermeable base surface via a first water-impermeable impermeable material provided on the impermeable base surface that supports the revetment structure. and a second impermeable impermeable material filled in a predetermined partition range on the lower impermeable sheet, and the second impermeable impermeable impermeable material A multiple layer consisting of an upper impermeable layer whose core material is an upper impermeable sheet having a lower end in close contact with a water material, and an intermediate layer provided between the lower impermeable layer and the upper impermeable layer The impermeable layer is constructed on the slope of the backfilling work.

Preferably, in the multiple impermeable layer, an intermediate cover soil layer is laid on the lower impermeable layer with a predetermined layer thickness, and the upper impermeable layer is laminated on the intermediate cover soil layer.

In the multiple impermeable layer, a lower buffer protection layer is laid along the slope, the lower buffer protection layer is laminated on the lower buffer protection layer, and the upper buffer protection layer is laminated on the upper impermeable layer. Layers are preferably laid.

It is preferable that the second water-impermeable water-impermeable material is filled in a space partitioned by a partition form member placed on the lower water-impervious sheet.

Protective mats are laminated on both sides of the lower impermeable sheet to form the lower impermeable layer, and protective mats are laminated on both sides of the upper impermeable sheet to form the upper impermeable layer. preferably

The protective mat is preferably made of nonwoven fabric.

Preferably, the intermediate covering soil layer is a mat-like body in which a cloth bag mold is filled with a filling material.

Preferably, the lower shock-absorbing protective layer and the upper shock-absorbing protective layer are filled with a filling material in a cloth bag formwork.

In the lower impermeable sheet and the upper impermeable sheet, anchor projections are formed in the areas partitioned by the partition form members, and the anchor projections are embedded in the second impermeable impermeable material. is preferred.

The first and second impermeable water-impermeable materials are preferably asphalt-based water-impervious materials, soil-based water-impervious materials, cement-based water-impervious materials, or chemical-based water-impervious materials.

The filling material is preferably solidified soil, construction surplus soil, seabed sediment, sand, asphalt-based, soil-based, cement-based, or chemical-based filling and solidifying materials.

As another invention, the present invention is an impervious structure covering the slope of the backfilling work of the revetment structure constructed so as to partition the landfill area of the sea surface disposal site, the impervious base supporting the revetment structure. A lower impermeable sheet having a lower end in close contact with the surface of the impermeable base under the weight of the sedimentary rubble or sedimentary waste through the first impermeable impermeable material provided on the surface is used as the core material. and a predetermined intermediate layer provided between the lower impermeable layer and the lower impermeable layer, and an upper impermeable layer having an upper impermeable sheet laid on the intermediate layer as a core material, characterized in that a multiple impermeable layer consisting of is constructed on the slope of the backfilling work.

As still another invention, the present invention provides a water impermeable structure that covers the slope of the backfill work of a seawall structure constructed to partition a landfill area of a sea surface disposal site, the water impermeable structure supporting the seawall structure. A predetermined intermediate layer is formed between the impermeable layer on the surface side of the impermeable base and the impermeable layer on the surface side of the impermeable base due to the surcharge due to the weight of the crushed rubble or sedimentary waste through the first impermeable impermeable material provided on the surface of the base. and an upper impermeable layer having an upper impermeable sheet laid on the intermediate layer as a core material is constructed on the slope of the backfilling work.

In the above-mentioned still another invention, the lower impermeable sheet is placed on the first impermeable impermeable material provided on the surface of the impermeable base by the superimposed load due to the weight of the crushed rubble or accumulated waste. It is preferable to adhere to the surface of the water substrate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view showing the overall structure of a sea surface disposal site in which one embodiment of the waterproof structure for a sea surface disposal site landfill area of the present invention is used. FIG. 2 is an enlarged side cross-sectional view showing an enlarged lower portion of the impervious structure shown in FIG. 1; FIG. 2 is an enlarged side cross-sectional view showing an enlarged lamination state of impermeable members on the slope of the impermeable structure shown in FIG. 1 ; FIG. 2 is an enlarged sectional side view showing an enlarged contact portion between the impermeable structure and the impermeable base shown in FIG. 1 ; FIG. 11 is an enlarged side cross-sectional view showing an enlarged contact portion between a water-impervious structure and a water-impermeable base according to another embodiment; FIG. 6 is an enlarged side cross-sectional view showing the arrangement of the impermeable sheet in the contact portion of FIG. 5 in an enlarged manner; The enlarged sectional side view which expanded and showed the lower part of the waterproof structure of other embodiment. Cross section. FIG. 8 is an enlarged side cross-sectional view showing an enlarged lamination state of water-impervious members on the slope of the water-impermeable structure shown in FIG. 7 ; The enlarged sectional side view which expanded and showed the lower part of the waterproof structure of other embodiment. FIG. 2 is a side cross-sectional view showing the overall structure of a sea surface disposal site landfill area (sea surface disposal site) in which one embodiment of a conventional waterproof structure for a sea surface disposal site landfill area is used. FIG. 11 is an enlarged side sectional view showing an enlarged lower portion of the waterproof structure shown in FIG. 10;

EMBODIMENT OF THE INVENTION Hereafter, the form for implementing the waterproof structure of the sea surface disposal site landfill area of this invention is demonstrated with reference to an accompanying drawing.

FIG. 1 shows an embodiment in which the impervious structure of the present invention is applied to a disposal site of the same scale as the conventional sea surface disposal site shown in FIG. FIG. 2 shows an enlarged view of the contact portion between the lower part of the impermeable structure and the impermeable stratum as an example of the impermeable base. As the impermeable base, there is an in-situ impermeable stratum or improved ground such as deep mixed treated soil (C.D.M.). The explanation will be based on an example of constructing a water-blocking structure on a sedimentary stratum.

In FIG. 1, a caisson 4 is installed on a riprap mound 3 created on an impermeable stratum 2 as a bank protection structure that defines a landfill area 11 that will become a sea surface disposal site 1 . The caisson 4 consists of a well-known reinforced concrete, steel, or hybrid box filled with filling sand. It functions as a bank protection structure that divides a landfill area 11 having a predetermined area and width. Furthermore, the multiple impermeable layer of the present invention is constructed on the slope of the rubble mound 3 on the landfill area side. As shown in FIG. 2, the lower end of the multiple impermeable layer 10 has a structure in close contact with the impermeable stratum.

The multiple impermeable layer 10 consists of two layers of impermeable sheets 20 and 21 (lower impermeable layer 24, upper impermeable layer 25) laminated with a protective mat 22, an intermediate covering soil layer 31, and upper and lower two layers of buffer protection. It is composed of layers 30 and 32, and functions as a laminated impermeable layer with a predetermined layer thickness. Furthermore, the holding riprap 5 is constructed so as to cover the entire slope surface on which the multiple impervious layer 10 is constructed, a landfill area 11 of a predetermined size is created, and landfill disposal is carried out in this landfill area 11 in the same manner as in the case of FIG. Waste 70 is brought in and landfilled, and after completion of landfilling with the planned amount of waste 70 , the surface layer is covered with soil 71 generated from construction, which is carried in.

FIG. 3 is a partial cross-sectional view schematically showing the layer structure of the multiple impermeable layer 10 shown in FIG. As shown in the figure, the multiple impermeable layer 10 is laid on the lower buffer protection layer 30 laid on the slope of the covering stone of the riprap mound 3 and in close contact with the lower buffer protection layer 30. , a lower impermeable layer 24 consisting of impermeable sheets 20 sandwiched by protective mats 22 on both sides, and an intermediate layer constructed on the lower impermeable layer 24 and ensuring a predetermined distance between the upper impermeable layer A cover soil layer 31, an upper impermeable layer 25 composed of a impermeable sheet 21 laid in close contact with the intermediate cover soil layer 31 and sandwiched between protective mats 22 on both sides, and an upper impermeable layer 25 constructed on the upper impermeable layer 25. , and an upper cushioning protective layer that protects the upper impermeable layer 25 .

Among the multiple impermeable layers 10, the lower cushioning protection layer 30, the intermediate covering soil layer 31, and the upper cushioning protection layer 32 are all filled with cement-based solidified soil as a filling material in the cloth bag formwork T. Also, it is a mat-like body having a predetermined thickness. The cloth bag formwork for constructing this mat-like body has an inner It consists of a bag-like body capable of forming a predetermined space in the body. The inner space of the cloth bag mold T is filled with the cement-based solidified soil S in a fluid state, and the solidified soil S is solidified to construct a mat-like body having a predetermined strength. In the present invention, a cloth bag mold is used, which has a continuous box shape filled with solidified soil S, in which space retaining wall materials of the same material are provided between the cloth materials constituting the front and back surfaces of the mold. ing. As an off-the-shelf cloth bag formwork T that performs the same function, there is a trade name "Tacom Mat" (manufactured by Taiyo Kogyo Co., Ltd.).

As a filling material, instead of cement-based solidified soil, construction surplus soil brought to the site, construction waste materials, seabed sedimentary soil that can be supplied on site, sea sand, mountain sand, bentonite, fly ash, various synthetic resin materials Soil-based, cement-based, and chemical-based filling and solidifying materials including, etc., or mixed materials thereof can also be used by filling and filling.

The mat-like body using the cloth bag formwork T is constructed by placing the cloth bag formwork T along the slope of the backfilling work or the riprap mound 3 without installing the formwork or scaffolding on the slope. A hardening material such as cement-based solidified soil S can be quickly constructed on a slope just by filling between two woven fabrics and hardening from the entrance. The thickness of this mat-like body can be arbitrarily set according to the length of the intermediate joining thread. In the case of this embodiment, it is assumed that the thickness of the mat-like body of the buffer protective layer is 50 to 100 mm, and the thickness of the mat-like body of the intermediate covering soil layer 31 is about 500 mm. If the layer thickness of the cushioning protective layer is 50 to 100 mm and the layer thickness of the intermediate covering soil layer 31 is about 500 mm, hardening material such as cement-based solidified soil S can be applied to a predetermined layer thickness without using a cloth bag formwork. It is also possible to build an intermediate covering soil layer and a cushioning protective layer by laminating.

The lower impermeable layer 24 and the upper impermeable layer 25 have the same structure, and both have a core material of the impermeable sheet 20 (21) of a low-density polyethylene sheet (LLDPE: thickness 3 mm) as a protective mat 22 on the upper and lower surfaces. A nonwoven fabric is integrally laminated. By laminating and arranging the nonwoven fabric as the protective mat 22 on both sides of the impermeable sheet in this way, the nonwoven fabric is in contact with the surface of the backfilling material of the rubble mound 3, and between the backfilling material and the impermeable layer. A large static friction force and a buffer effect can be secured. Other materials suitable for waterproof sheets include polyvinyl chloride (PVC) sheets, laminated sheets of non-woven fabric and PVC sheets, thermoplastic elastomer (TPE) sheets, single sheets of high density polyethylene (HDPE), etc. and can be selected and used as appropriate. The thickness of the sheet is preferably about 1.5 to 3.0 mm in consideration of elongation due to subsidence or the like.

A polyethylene terephthalate (PET) nonwoven fabric (500 g/m ² ) is used for the protective mat 22 in this embodiment. These two protective mats 22 are laminated so as to sandwich the impermeable sheet 20 (21) to constitute the impermeable layer 24 (25). Other suitable materials for the protective mat 22 include polyethylene (PE) and polypropylene (PP). The protective mat 22 may be used only on one side of the .

Here, the configuration of the contact portion with the impermeable stratum 2 at the lower end of the multiple impermeable layer 10 of the impermeable structure of the present invention will be described with reference to FIGS. 2 and 4. FIG. The multiple impermeable layer 10 on the slope of the rubble mound 3 has the laminated structure shown in FIG. Only the tip 20a of the impermeable sheet extends on the surface of the impermeable stratum 2 on the tip side thereof. At this time, between the lower surface of the tip 20a of the impermeable sheet and the impermeable stratum surface 2, an asphalt mastic adhesion layer 35, which is a thermoplastic material as an impermeable impermeable material and has a thickness of about 15 cm, is formed. Adhesion between the sheet 20 and the impermeable stratum surface 2 is achieved. When the impermeable stratum 2 is replaced with deep mixed treated soil (C.D.M.) as the impermeable base, the asphalt mastic adhesion layer 35 is similarly constructed to allow the tip 20a of the impermeable sheet 20 to adhere. Length L can be shortened.

When the impermeable sheet 20 is directly laid on the surface of the impermeable stratum without providing the asphalt mastic adhesion layer 35 as in the conventional impermeable work (for example, FIG. 10), the tip of the impermeable sheet 20 20a is extended from the toe of the rubble mound 3 along the surface of the impermeable stratum 2 by a laying length L1=5 m.

At the tip 20a of the impermeable sheet 20 of the lower impermeable layer 24, two concrete blocks 33 are placed at the toe of the riprap mound 3 and at a position about 1.25 m away from the toe on the impermeable stratum surface side. 34 is placed. These concrete blocks 33 and 34 function as partition forms in the same manner as in the conventional structure, and between these two concrete blocks 33 and 34, asphalt mastic is filled and solidified as an impermeable waterproof material. Layers 36 are formed respectively. As shown in FIGS. 2 and 4, the concrete blocks 33 and 34 in this embodiment are concrete block 33 (approximately 0.5 m×approximately 0.5 m) and concrete block 34 (approximately 0.5 m×approximately 0.5 m). It consists of an elongated rectangular parallelepiped with a cross-section of 6 to 0.7 m), and is installed so that the longitudinal direction of the block extends along the extension direction of the toe of the slope. The height of the concrete block 33 on the toe side is almost equal to the vertical height of the intermediate covering soil layer 31 at the toe position, and the concrete block 33 is at the toe position of the impermeable sheet 20 of the lower impermeable layer 24. The tip 21a of the impermeable sheet 21 of the upper impermeable layer 25 extends on the upper surface of the concrete block 33, and the tips 20a and 21a of the impermeable sheets 20 and 21 are made of asphalt. It is laid so as to extend over the upper and lower surfaces of the mastic filling layer 36 . Soil system containing bentonite, fly ash, various synthetic resin materials, etc. instead of asphalt mastic, which is a thermoplastic material as a water-impermeable waterproof material used in the asphalt mastic adhesion layer 35 and the asphalt mastic filling layer 36 described above. A water-shielding material, a cement-based water-shielding material, or a chemical-based water-shielding material can also be used.

That is, in the present invention, the impermeable sheet 20 of the lower impermeable layer 24 and the impermeable sheet 21 of the upper impermeable layer 25 both have the tip portions 20a and 21a in the asphalt mastic filling layer 36 in the laid state. A contact length L2 (for example, 1.25 m=required contact length 0.5 m×safety factor 2.5) is ensured. In this embodiment, the asphalt mastic coating layer 37 using the impermeable water-impermeable material is formed on the upper surface of the water-impermeable sheet with a predetermined thickness, but the asphalt mastic coating layer 37 may not be provided in some cases.

In the embodiment of the present invention, asphalt mastic in a molten state, as shown enlarged in FIG. It fills the space between 34 and hardens while maintaining its function as a viscoelastic body in a state of being in close contact with the upper surface of the lower impermeable sheet 20 and the upper and lower surfaces of the upper impermeable sheet 21 . Materials other than concrete blocks are preferable for the material of the partition form members, and materials that do not deteriorate in the sea, such as steel materials and stone materials.

In the above description, the end of the lower impermeable sheet 20 is sandwiched between the asphalt mastic adhesion layer 35 and the asphalt mastic filling layer 36 formed in the space partitioned by the concrete blocks 33 and 34 for shielding. Hydration is realized, but without using the asphalt mastic filling layer 36 as a holding layer, the impermeable sheet 20 is brought into close contact with the asphalt mastic by the superimposed load due to the weight of the crushed rubble and wastes stacked on the impermeable sheet 20. Adherence to layer 35 is also possible.

FIG. 5 shows a portion of the lower impermeable layer 24 located within the concrete blocks 33 and 34 at the tip of the impermeable sheet 20, and a portion of the impermeable sheet 21 of the upper impermeable layer 25 located within the concrete blocks 33 and 34. At the site, a water-impermeable sheet 38 (for example, a product name Stud Liner (manufactured by Taiyo Kogyo Co., Ltd.)) having anchor projections 38a formed at equal intervals on the back surface of the sheet is joined to the water-impervious sheets 20 and 21, and a concrete block is formed. The space partitioned by 33 and 34 is filled with asphalt mastic 36. FIG. The impervious sheet 38 having the anchor projections 38a formed on the back surface has a shape as shown in FIG. 6(a). can be increased. As a result, the contact length between the waterproof sheet 38 and the asphalt mastic can be shortened from the design requirement of 1.25 m, and the filling amount of the asphalt mastic can be reduced. can be suppressed. Also, instead of the anchor protrusion 38a having the shape shown in FIG. The same effect can be obtained by arranging them on the inner surface of the water sheet and fusing them together. Also, the anchor projection 38a and the L-shaped member 38b can be used in combination.

FIG. 7 shows, as another embodiment of the multiple impermeable layer 10, a fabric bag formwork T that constitutes an intermediate covering soil layer 31 with a predetermined layer thickness. A fabric bag form T in which two impermeable sheets 20 and 21 are attached to each other and which is integrated with the impermeable sheets 20 and 21 is used. An embodiment is shown in which a bag form T made of cloth is laid on a slope and filled with solidified soil S to form a waterproof structure. FIG. 8 shows a partially enlarged multi-layer impermeable layer 10 using this cloth bag formwork T. As shown in FIG. By using this cloth bag formwork T capable of constructing the intermediate covering soil layer 31, a gap corresponding to the layer thickness of the intermediate covering soil layer 31 is provided between the two impermeable sheets to form a double impermeable layer at once. can be built. In consideration of the durability of the impermeable sheet, it is also preferable to integrally laminate a protective mat 22 made of nonwoven fabric or the like on the contact surface with the backfilling work or the like.

FIG. 9 shows, as another embodiment, the end portions of the impermeable sheet 20 of the lower impermeable layer 24 and the impermeable sheet 21 of the upper impermeable layer 25 are provided with the impermeable structure for each of the impermeable sheets 20 and 21. It shows an example in which it is provided. In addition, in each impermeable structure, the asphalt mastic filling layer 36 is omitted, and the impermeable sheets 20 and 21 are pressed against the asphalt mastic adhesion layer 35 by holding rubble and sedimentary waste to make the ends of the impermeable sheet waterproof. It is also possible to

In the above description, the present invention is not limited to various embodiments, and various modifications are possible within the scope indicated in each claim. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

1 Sea surface disposal site 2 Impermeable stratum 3 Rubble mound 10 Multiple impermeable layer 11 Landfill area 20, 21, 38 Impermeable sheet 22 Protective mat 24 Lower impermeable layer 25 Upper impermeable layer 30 Lower buffer protective layer 31 Middle Covering soil layer 32 Upper buffer protective layers 33, 34 Concrete block (partition formwork material)
35 Asphalt mastic adhesion layer 36 Asphalt mastic filling layer 37 Asphalt mastic coating layer S Solidified soil T Cloth bag formwork

Claims (15)

A water-impervious structure that covers the slope of the backfill work of a seawall structure constructed to partition the landfill area of a sea surface disposal site,
A lower impermeable sheet having a lower end in close contact with the impermeable base surface via a first impermeable impermeable material provided on the impermeable base surface supporting the revetment structure as a core material a side impermeable layer;
An upper side extending over a second impermeable impermeable material filled in a predetermined division range on the lower impermeable sheet and having a lower end in close contact with the second impermeable impermeable material an upper impermeable layer having a impermeable sheet as a core material;
an intermediate layer provided between the lower impermeable layer and the upper impermeable layer;
A water-shielding structure for a sea surface disposal site landfill area, characterized in that a multiple water-shielding layer consisting of is constructed on the slope of the backfilling work. 2. The multiple impermeable layer according to claim 1, wherein an intermediate covering soil layer having a predetermined layer thickness is laid on the lower impermeable layer, and the upper impermeable layer is laminated on the intermediate covering soil layer. waterproof structure of the landfill area of the sea surface disposal site. The multiple impermeable layer has a lower buffer protective layer laid along the slope, and the lower impermeable layer is laminated on the lower buffer protective layer,
3. The impermeable structure for a landfill area of a sea surface disposal site according to claim 1, wherein an upper buffering protective layer is laid on the upper impermeable layer. 2. Impermeability of the sea surface disposal site landfill area according to claim 1, wherein the second impermeable impermeable material is filled in a space partitioned by a partition form material installed on the lower impermeable sheet. structure. Protective mats are laminated on both sides of the lower impermeable sheet to form the lower impermeable layer, and protective mats are laminated on both sides of the upper impermeable sheet to form the upper impermeable layer. A water-shielding structure for a landfill area of a sea surface disposal site according to claim 1. 6. The waterproof structure for a landfill area of a sea surface disposal site according to claim 5, wherein the protective mat is made of non-woven fabric. 3. The seepage control structure for a landfill area of a sea surface disposal site according to claim 2, wherein the intermediate covering soil layer is made of a mat-like body in which a filling material is filled in a cloth bag formwork. 4. The water shielding structure for a landfill area of a sea surface disposal site according to claim 3, wherein said lower cushioning protective layer and said upper cushioning protective layer are made of a mat-like body in which a filling material is filled in a cloth bag formwork. In the lower impermeable sheet and the upper impermeable sheet, anchor projections are formed in the areas partitioned by the partition form members, and the anchor projections are embedded in the second impermeable impermeable material. A water-shielding structure for a landfill area of a sea surface disposal site according to claim 4. The sea surface according to claim 1, wherein the first and second impermeable water-impermeable materials are any one of asphalt-based water-impervious material, soil-based water-impervious material, cement-based water-impervious material, and chemical-based water-impervious material. Water shielding structure for the landfill area of the disposal site. 9. The sea surface disposal according to claim 7 or claim 8, wherein the filling material is solidified soil, construction waste soil, seabed sedimentary soil, sand, asphalt-based, soil-based, cement-based, or chemical-based filling and solidifying material. Impervious structure of the landfill area. A water-impervious structure that covers the slope of the backfill work of a seawall structure constructed to partition the landfill area of a sea surface disposal site,
A lower end portion in close contact with the surface of the impermeable base due to the superimposed load of the weight of the riprap or the accumulated waste through the first impermeable impermeable material provided on the surface of the impermeable base that supports the revetment structure. A lower impermeable layer with a lower impermeable sheet as a core material,
an upper impermeable layer provided with a predetermined intermediate layer between the lower impermeable layer and having an upper impermeable sheet laid on the intermediate layer as a core material;
A water-shielding structure for a sea surface disposal site landfill area, characterized in that a multiple water-shielding layer consisting of is constructed on the slope of the backfilling work. A water-impervious structure that covers the slope of the backfill work of a seawall structure constructed to partition the landfill area of a sea surface disposal site,
Through the first impermeable impermeable material provided on the surface of the impermeable base that supports the revetment structure, the impermeable layer on the surface side of the impermeable base is formed by the weight of the riprap or accumulated waste. An upper impermeable layer having an upper impermeable sheet laid on the intermediate layer as a core material;
A water-shielding structure for a sea surface disposal site landfill area, characterized in that a multiple water-shielding layer consisting of is constructed on the slope of the backfilling work. The lower impermeable sheet is adhered to the surface of the impermeable substrate by an additional load due to the weight of the crushed rubble or accumulated waste on the first impermeable impermeable material provided on the surface of the impermeable substrate. Item 14. A water-shielding structure for a landfill area at a sea surface disposal site according to Item 13. 14. The impermeable structure of a sea surface disposal site landfill area according to any one of claims 1, 12 and 13, wherein the impermeable basement is an impermeable stratum or a deep mixed treated soil layer.

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