JP6990625B2 - Impermeable structure - Google Patents

Description

The present invention relates to a water-impervious structure having a water-impervious sheet and a protective mat, which is laid in a controlled waste disposal site or the like.

General waste and incinerator ash, which is the residue obtained by burning industrial waste in an incinerator, are buried in a managed waste disposal site on land or on the sea surface. The managed waste disposal site (hereinafter referred to as the disposal site) is divided as a disposal site so that the water in the disposal site does not leak out of the disposal site. An impermeable structure having an impermeable sheet and a protective mat is laid on the bottom surface. By law, it is necessary to install the impermeable sheet twice. This is because even if one impermeable sheet is damaged by the waste thrown in as landfill material, if the other impermeable sheet is not damaged, it may be contaminated in the disposal site. It is based on the fail-safe design concept of preventing water from leaking out of the landfill.

In addition, the waste thrown into this disposal site does not have the possibility of damaging the impermeable sheet such as reinforcing bars, steel frames, concrete pieces, etc., and waste in the disposal site limited to incinerator ash and coal ash. It is unlikely that the impermeable sheet will be damaged by this. In this case, a double geomembrane sheet may be integrated and laid. Therefore, on the lower surface of the impermeable sheet in the laid state, a protective mat is arranged to prevent damage to the impermeable sheet from the base material arranged on the base surface on which the impermeable sheet is laid, while the impermeable sheet is placed. A protective mat is also placed on the upper surface of the surface to prevent damage to the water-impervious sheet from the loading material installed on the water-impervious sheet. And, in order to integrate the double impermeable sheets, it is necessary to integrate them including the upper and lower protective mats. Then, in the laid state, a multi-layer integrated impermeable sheet having a five-layer structure composed of a protective mat / impermeable sheet / protective mat / impermeable sheet / protective mat is adopted from above.

In order to manufacture the multi-layer integrated water-impervious sheet, first, the water-impervious sheet and the protective mat are manufactured as raw fabric having a width of about 2 m at each manufacturing factory. Subsequently, at the manufacturing plant, a strip-shaped impermeable sheet and protective mat are unwound from the raw fabric of these impermeable sheets and protective mats, and from above, a protective mat / impermeable sheet / protective mat / impermeable sheet / protective mat. A multi-layer integrated geomembrane sheet (width 2 m) is manufactured by partially heat-welding in a state of being stacked on a layer. This multi-layer integrated geomembrane sheet is rolled up and packed in a roll shape.

It should be noted that the heat welding process partially applied to form the multi-layer integrated water-impervious sheet is to reduce the number of times the water-impervious sheet and the protective mat are laid at the time of construction at the disposal site, that is, to lay it once. As a possible measure, it is a temporary measure to hold one layer of the protective mat when it is temporarily placed on the sea surface as a water-impervious structure described later, and it does not have permanent welding strength. Then, packing rolls of a plurality of multi-layered integrated impermeable sheets are carried into the disposal site, and the widthwise ends of the strip-shaped multi-layered integrated impermeable sheets are stacked on each layer at the local land yard or on a large fitting ship. By connecting by heat welding in the state of being in a state, it is wide-processed into a large panel-shaped (substantially rectangular) water-impervious structure having a width of about 6 to 50 m. This impermeable structure is pulled out onto a plurality of sea surfaces, and the ends of each impermeable structure are further connected on the sea surface to form a single sheet covering the entire target area, and then the sea surface or seawall. It is laid down on the side.

In addition, a hook member of the same material as the water-impervious sheet is attached to the second-layer water-impervious sheet polymerization part from the top at the connection part connecting each multi-layer integrated water-impervious sheet of the water-impervious structure. , This hook member is projected upward in a state of penetrating the protective mat polymerization site of the first layer. A float is attached to this hook member. Then, after the water-impervious structure is pulled out to the sea surface, it is temporarily placed floating on the sea surface until it is submerged. The second-layer geomembrane sheet has sufficient buoyancy to ascend to the sea surface due to the floating tool.

However, in each multi-layer integrated geomembrane sheet of the water-impervious structure, the third-layer protective mat located on the lower surface of the second-layer geomembrane sheet whose buoyancy is obtained by the float is the multi-layer integrated water-impervious sheet. Due to the partial heat welding performed at the sheet manufacturing factory, it is only joined to the second layer of the impermeable sheet. Therefore, when the impermeable structure is temporarily moored on the sea surface for a long period of time and is affected by wind waves, the second and third layers of each multi-layer integrated impermeable sheet The heat-welded part between the protective mat and the protective mat is peeled off, and the third layer of the protective mat, the fourth layer of the impermeable sheet and the fifth layer of the protective mat fall off, and the impermeable structure is made into the original multi-layered structure. It may be difficult to lay it in the structure. This is because the welding strength of the heat-sealed portion between the second-layer and third-layer protective mats of each multi-layer integrated water-shielding sheet of the water-impervious structure is permanent welding as described above. Since strength is not required, when the impermeable structure is temporarily placed on the sea surface, the third layer protective mat, the fourth layer impermeable sheet and the fifth layer protective mat are held for a long period of time. This is because the heat-welded portion between the second layer of the water-impervious sheet and the third layer of the protective mat is peeled off.

By the way, as a conventional technique for joining a water-impervious sheet and a protective mat, Patent Document 1 states that the joining auxiliary material is in the form of a film containing the same material as the water-impervious sheet, and the protective mat has a water-impervious material. The joint with the sheet is integrally provided by a well-known heat welding method or thermocompression bonding method, and the joint of the protective mat is integrally bonded to the water-impervious sheet by heat welding or thermocompression bonding via this bonding auxiliary material. Is disclosed.

Japanese Unexamined Patent Publication No. 2008-188500

Even if the invention of Patent Document 1 described above is adopted, there is a possibility that the protective mat and the joining auxiliary material, which are different materials from each other, may be peeled off, and the above-mentioned problem cannot be solved.

The present invention has been made in view of this point, and an object of the present invention is to provide a water-impervious structure capable of retaining an original multi-layer structure during the temporary placement on the sea surface when the mooring is temporarily placed. ..

In the present invention, as a means for solving the above-mentioned problems, in the invention of claim 1, a protective mat made of different materials and a water-impervious sheet are alternately stacked to form a three-layer protective mat and a two-layer water-impervious sheet. It is a water-impervious structure in which the ends of a multi-layered integrated water-impervious sheet, which is partially welded together, are connected to each other to secure a desired sheet area.
The connection portion between the end portion of one multi-layer integrated impermeable sheet and the end portion of the other multi-layer integrated impermeable sheet is located at the upper and lower ends of each of the multi-layer integrated impermeable sheets in the laid state. The upper and lower end protective mats overlapped with the ends of the protective mats, and the upper and lower end protective mats are arranged inside the overlapping portions, respectively, on the upper and lower sides of each of the multilayer integrated water-impervious sheets. Each of the multilayer integrated impermeable sheets is located inside the upper and lower impermeable sheet portions and the upper and lower impermeable sheet portions, which are configured by overlapping or facing each other at the ends of the located impermeable sheets. A strip-shaped connection sheet, which is arranged between the ends of the protective mat located in the middle of the sheet in the vertical direction and is made of the same material as the water-impervious sheet, overlaps with each other and is integrated by welding at least the same materials. Consists of
A hook member to which a float is attached is welded to the upper water-impervious sheet portion, which is made of the same material as the water-impervious sheet, and the hook member penetrates the upper end protective mat polymerization portion and projects upward. It is characterized by that.

Further, the invention of claim 2 is a multi-layer integrated type shield formed by alternately stacking protective mats and water-impervious sheets made of different materials and partially welding a three-layer protective mat and a two-layer water-impervious sheet. A water-impervious structure in which the ends of a water sheet are connected to each other to secure a desired sheet area.
The connection portion between the end portion of one multi-layer integrated impermeable sheet and the end portion of the other multi-layer integrated impermeable sheet is located at the upper end and the lower end of each of the multi-layer integrated impermeable sheets in the laid state. The upper and lower end protective mats overlapped with the ends of the protective mats, and the upper and lower end protective mats are arranged inside the upper and lower protection mats, respectively, on the upper and lower sides of each of the multilayer integrated water-impervious sheets. The upper and lower geomembrane sheet polymerization sites, which are formed by overlapping the ends of the geomembrane sheets located in, and the inside of the upper and lower geomembrane sheet polymerization sites, are three-dimensionally overlapped. , Arranged between the ends of the protective mats located in the middle of each multi-layer integrated impermeable sheet in the vertical direction, and branched from the ends of the impermeable sheets located on the upper and lower sides of each multi-layer integrated impermeable sheet. The branched impermeable sheet overlapped with the superposed site of the branched impermeable sheet, and at least integrated by welding the same materials.
A hook member to which a float is attached is welded to the upper water-impervious sheet polymerization portion, which is made of the same material as the water-impervious sheet, and the hook member penetrates the upper end protection mat polymerization portion and projects upward. It is characterized by being present.

According to the impermeable structure of the present invention, when the mooring is temporarily placed on the sea surface, the original multi-layer structure can be maintained without peeling or falling off during the temporary placement period.

FIG. 1 is a plan view of the impermeable structure according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of a multi-layer integrated impermeable sheet adopted in the impermeable structure of FIG. FIG. 3 is a perspective view of the connection portion of the water-impervious structure of FIG. 1 between the widthwise end portion of one multi-layer integrated impermeable sheet and the widthwise end portion of the other multi-layer integrated impermeable sheet. Is. FIG. 4 is a cross-sectional view of the water-impervious structure of FIG. 1 at a connection portion between the widthwise end portion of one multi-layer integrated impermeable sheet and the widthwise end portion of the other multi-layer integrated impermeable sheet. Is. FIG. 5 shows the water-impervious structure of FIG. 1 at the connection portion between the widthwise end portion of one multi-layer integrated impermeable sheet and the widthwise end portion of the other multi-layer integrated impermeable sheet. It is sectional drawing which shows the embodiment. FIG. 6 is a cross-sectional view of a multi-layer integrated impermeable sheet adopted in the impermeable structure according to the second embodiment of the present invention. FIG. 7 is a water-impervious structure according to a second embodiment of the present invention, in which one multi-layer integrated impermeable sheet has a widthwise end and the other multi-layer integrated impermeable sheet has a width-oriented end. It is sectional drawing of the connection part of.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS. 1 to 7.
The impermeable structures 1a and 1b according to the first and second embodiments of the present invention are partitioned as a controlled waste disposal site, for example, laid on the side surface of a sloped embankment or a mixed embankment revetment, and on the bottom surface of the disposal site. Is to be done. As shown in FIG. 1, the impermeable structures 1a and 1b according to the first and second embodiments are a strip-shaped multi-layered integrated impermeable sheet 2a, 2a (2b) on a local land yard or a large fitted ship. By connecting the widthwise ends of 2b) at the connection portion 10a (10b), a desired sheet area is secured and a panel shape (substantially rectangular shape) is formed. In the impermeable structures 1a and 1b according to the first and second embodiments, the dimensions of the multilayer integrated impermeable sheets 2a and 2a (2b, 2b) in the width direction (left-right direction in FIG. 1) are approximately 2 m. The impermeable structures 1a and 1b according to the first and second embodiments have a total width (length in the left-right direction of FIG. 1) of about 6 to 50 m and a length in the longitudinal direction (length in the vertical direction of FIG. 1). It will be about 10 to 200 m.

First, the impermeable structure 1a according to the first embodiment will be described with reference to FIGS. 1 to 5.
As shown in FIG. 2, the multilayer integrated water-impervious sheet 2a is a protective mat 4A / a water-impervious sheet 5A / a protective mat 4B / a water-impervious sheet 5B / a protective mat 4C in a state of being laid in a predetermined area. The five layers are partially (dashed-dotted line portion in FIG. 1) heat-welded and integrated in a state of being stacked. The protective mats 4A to 4C are made of materials such as long fiber non-woven fabric, short fiber non-woven fabric, and anti-hair felt. The water-impervious sheets 5A and 5B have a desired water-impervious function, and are made of vinyl chloride, polyethylene, or other material using a polymer material. The thickness of the water-impervious sheets 5A and 5B is set within the range of 1.5 to 10 mm. The multi-layer integrated water-impervious sheet 2a is integrated by joining the protective mats 4A to 4C and the water-impervious sheets 5A and 5B, which are made of different materials, by partially heat-welding. The bonding strength is simply to integrate the impermeable structure 1a to the extent that it holds one layer of the protective mat 4C when it is temporarily placed on the sea surface, and the bonding strength is larger than that of the protective mat 4C one layer in the peeling direction. It is not strong against loads and is not reliable for long-term bonding strength.

As shown in FIG. 2, at the widthwise end of the multilayer integrated water-impervious sheet 2a, the widthwise end faces of the protective mats 4A and 4C located on the first and fifth layers are located substantially on the same plane. .. The widthwise end faces of the second and fourth layers of the water-impervious sheets 5A and 5B are located on substantially the same plane. Further, the widthwise end faces of the protective mats 4A and 4C located on the first and fifth layers are slightly outward in the width direction from the widthwise end faces of the water-impervious sheets 5A and 5B located on the second and fourth layers. It stands out. Further, on the widthwise end face of the protective mat 4B located in the third layer, the widthwise end face of the portion where the connection sheet 15 described later is arranged is the width of the water-impervious sheets 5A and 5B located in the second and fourth layers. It is located inward in the width direction from the directional end face.

As described above, the widthwise end of one multilayer-integrated geomembrane sheet 2a and the widthwise end of the other multilayer-integrated geomembrane sheet 2a are connected by a connection portion 10a. As shown in FIGS. 3 and 4, the connection portion 10a is overlapped with the widthwise end portions of the protective mats 4A and 4A located at the first layer (upper end) of the multi-layer integrated impermeable sheets 2a and 2a. It is configured by superimposing the upper end protective mat overlapping portion 12A and the widthwise end portions of the water-impervious sheets 5A and 5A located on the second layer (upper side) of the multi-layer integrated water-impervious sheets 2a and 2a. Between the upper impermeable sheet layered portion 13A (upper impermeable sheet portion) and the widthwise ends of the protective mats 4B and 4B located in the third layer (middle in the vertical direction) of each multilayer integrated impermeable sheet 2a and 2a. The strip-shaped connection sheet 15 arranged so as not to have a gap in the surface and the widthwise end portions of the water-impervious sheets 5B and 5B located in the fourth layer (lower side) of the multi-layer integrated water-impervious sheets 2a and 2a are overlapped with each other. The width of the lower impermeable sheet layered portion 13B (lower impermeable sheet portion) and the protective mats 4C and 4C located at the fifth layer (lower end) of each multi-layer integrated impermeable sheet 2a and 2a. The lower end protection mat polymerization site 12B, which is formed by overlapping the directional ends, is overlapped and integrated.

It should be noted that the upper end protective mat polymerization site 12A, the upper impermeable sheet polymerization site 13A, the lower impermeable sheet polymerization site 13B and the lower end protection mat polymerization site 12B of the connection site 10a in FIGS. 3 and 4 are on the left side in FIG. The protective mats 4A and 4C from (one side) and the protective mats 4A and 4C from the right side (the other side) and the water-impervious sheets 5A and 5B are superposed on the upper side of the water-impervious sheets 5A and 5B. However, in FIG. 4, the protective mats 4A and 4C from the right side and the water-impervious sheets 5A and 5B may be superposed on the upper side of the protective mats 4A and 4C and the water-impervious sheets 5A and 5B from the left side. The stacking order of each of the polymerization sites 12A, 13A, 13B, and 12B is not particularly limited. The connection sheet 15 is made of the same material as the water-impervious sheets 5A and 5B. The thickness of the connection sheet 15 is 1/10 to 1 times the thickness of the protective mat 4B of the third layer. In the present embodiment, the widthwise dimension of the connection sheet 15 is set in the range of 10 to 30 cm. The connection sheets 15 may be arranged in the entire longitudinal direction of the impermeable structure 1a, or may be arranged in plurality at intervals along the longitudinal direction.

Further, in the embodiments shown in FIGS. 3 and 4, the upper and lower geomembrane sheet polymerization sites 13A and 13B are the second and fourth layers (upper and lower sides) of the multi-layer integrated geomembrane sheets 2a and 2a. ), But the widthwise ends of the water-impervious sheets 5A and 5A (5B, 5B) are not limited to this, as shown in FIG. 5, the upper and lower water-impervious sheets are overlapped. In the portions 13A and 13B, the widthwise end faces of the water-impervious sheets 5A and 5A (5B, 5B) located on the second and fourth layers (upper and lower sides) of the multi-layer integrated water-impervious sheets 2a and 2a are mutually. It may be arranged so as to face each other and abut.

The connection portions 10a of the multilayer integrated water-shielding sheets 2a and 2a are integrated by heat welding. This heat welding is performed over the entire longitudinal direction at the connection portion 10a. As a result, in the upper end protective mat polymerization portion 12A in the connection portion 10a, since the widthwise end portions of the protective mats 4A and 4A are made of the same material, they are strongly heat-welded to each other. In the upper water-impervious sheet polymerization portion 13A, since the widthwise end portions of the respective water-impervious sheets 5A and 5A are made of the same material, they are strongly heat-welded to each other. In the lower impermeable sheet polymerization portion 13B, since the widthwise end portions of the respective impermeable sheets 5B and 5B are made of the same material, they are strongly heat-welded to each other. Further, since the upper impermeable sheet polymerization portion 13A and the connection sheet 15 are made of the same material, they are strongly heat-welded to each other, and since the lower impermeable sheet polymerization portion 13B and the connection sheet 15 are made of the same material, they are mutually strong. Is heat welded to. Further, in the lower end protective mat polymerization portion 12B, since the widthwise end portions of the protective mats 4C and 4C are made of the same material, they are strongly heat-welded to each other.

Then, in the connection portion 10a of each multilayer integrated water-impervious sheet 2a and 2a, the upper impermeable sheet polymerization portion 13A and the lower impermeable sheet polymerization portion 13B are firmly heat-welded via the connection sheet 15. .. As a result, in the present impermeable structure 1a, there are four layers of each multi-layer integrated impermeable sheet 2a and 2a, the second layer (upper side) of the impermeable sheets 5A and 5A, and each multi-layer integrated impermeable sheet 2a and 2a. The eyes (lower side) of the water-impervious sheets 5B and 5B are integrally and firmly firmly connected to each other via the upper water-impervious sheet polymerization part 13A, the connection sheet 15 and the lower water-impervious sheet polymerization part 13B in the connection part 10a. To. This welding strength is much higher than the welding strength due to partial heat welding applied when integrating as a multi-layer integrated water-impervious sheet 2a, and the hook member 18 described later is heat-welded to the upper water-impervious sheet polymerization site 13A. It will be equal to or higher than the welding strength at the time of welding.

As shown in FIG. 3, in the connection portion 10a of each multi-layer integrated impermeable sheet 2a and 2a of the impermeable structure 1a according to the first embodiment, the hook member 18 is placed on the upper surface of the upper impermeable sheet polymerization portion 13A. Are connected by heat welding. The hook member 18 is made of the same material as the water-impervious sheet 5A and 5B, and is firmly heat-welded to the upper water-impervious sheet polymerization site 13A. As shown in FIG. 1, a plurality of hook members 18 are heat-welded at a connection portion 10a at intervals along the longitudinal direction. In this embodiment, the hook members 18 are provided at intervals of about 2.0 m. An opening 20 is formed in the upper end protective mat polymerization portion 12A at a position corresponding to each hook member 18. Each of the hook members 18 heat-welded to the upper water-impervious sheet polymerization site 13A is inserted into the corresponding opening 20 provided in the upper end protective mat polymerization site 12A and protrudes upward. A float (not shown) is attached to each of these hook members 18.

In the connection portion 10a of each multi-layer integrated impermeable sheet 2a and 2a, the widthwise end portions of the impermeable sheets 5A and 5A located on the second layer (upper side) of each multi-layer integrated impermeable sheet 2a and 2a are formed. When they do not overlap and are arranged so that the widthwise end faces of the water-impervious sheets 5A and 5A face each other and abut as shown in FIG. 5, the hook member 18 is the water-impervious sheet 5A and 5A. It is connected so as to straddle the end in the width direction.

Then, after the impermeable structure 1a according to the first embodiment is pulled out on the sea surface, it is temporarily placed on the sea surface by each float during the period until it is sunk. At this time, the first-layer protective mat 4A and the second-layer water-impervious sheet 5A of each multi-layer integrated impermeable sheet 2a of the present impermeable structure 1a have sufficient buoyancy for floating on the sea surface by the float. Has been done. Further, in the present impermeable structure 1a, in the connection portion 10a of each multilayer integrated impermeable sheet 2a and 2a, the upper impermeable sheet polymerization portion 13A and the lower impermeable sheet polymerization portion 13B are interposed via the connection sheet 15. It is strongly heat-welded. That is, in the present water-impervious structure 1a, the second-layer (upper side) water-impervious sheets 5A and 5A of each multi-layer integrated water-impervious sheet 2a and 2a and the fourth layer of each multi-layer integrated water-impervious sheet 2a and 2a. The (lower) geomembrane sheets 5B and 5B are integrally and firmly firmly connected to each other via the upper geomembrane sheet polymerization site 13A, the connection sheet 15 and the lower geomembrane sheet polymerization site 13B at the connection site 10a. There is. As a result, even if the present impermeable structure 1a is affected by wind waves while being moored and temporarily placed on the sea surface for a long period of time, the three layers of each multi-layer integrated impermeable sheet 2a in the present impermeable structure 1a It is possible to reduce the risk that the layer protective mat 4B, the fourth layer impermeable sheet 5B and the fifth layer protective mat 4C will fall off, and the original multi-layer structure can be maintained.

The fourth-layer geomembrane sheet 5B and the fifth-layer protective mat 4C of each multi-layer integrated geomembrane sheet 2a are partially heat-welded at a manufacturing plant integrated as the multi-layer integrated geomembrane sheet 2a. However, as described above, the welding strength of the heat-welded portion between the fourth-layer geomembrane sheet 5B and the fifth-layer protective mat 4C is above the sea surface as the present impermeable structure 1a. It is sufficient to hold the fifth layer protective mat 4C of each multi-layer integrated water-impervious sheet 2a when temporarily placed in the above-mentioned, and is sufficient to hold the fourth-layer water-impervious sheet 5B of each multi-layer integrated water-impervious sheet 2a. The heat-welded portion between the and the fifth layer protective mat 4C is peeled off, and the fifth layer protective mat 4C does not fall off.

According to the water-impervious structure 1a according to the first embodiment described above, the widthwise end portion of one multi-layer integrated impermeable sheet 2a and the widthwise end portion of the other multi-layer integrated impermeable sheet 2a. The widthwise ends of the protective mats 4A and 4A (4C, 4C) located at the upper and lower ends (first layer and fifth layer) of each multi-layer integrated water-impervious sheet 2a and 2a are overlapped with each other. Upper and lower end protective mats are arranged inside the overlapping sites 12A and 12B and the upper and lower end protective mats overlapping sites 12A and 12B, respectively, and are located on the upper and lower sides (second and fourth layers) of each multi-layer integrated water-impervious sheet 2a and 2a. Upper and lower geomembrane sheet polymerization sites 13A and 13B and upper and lower geomembrane sheet polymerization sites 13A on which the widthwise ends of the geomembrane sheets 5A and 5A (5B, 5B) located at the eye) are overlapped. , 13B, and are arranged between the widthwise ends of the protective mats 4B and 4B located in the middle (third layer) in the vertical direction of each multi-layer integrated geomembrane sheet 2a and 2a. The strip-shaped connection sheet 15 made of the same material as the above is overlapped with each other, and is integrated by heat welding of at least the same materials. Further, a hook member 18 to which a float is attached is heat-welded to the upper water-impervious sheet polymerization portion 13A, which is made of the same material as the water-impervious sheets 5A and 5B, and the hook member 18 penetrates the upper end protection mat polymerization portion 12A. And it is projected upward.

As described above, in the connection portion 10a of each multi-layer integrated impermeable sheet 2a and 2a in the impermeable structure 1a according to the first embodiment, the upper impermeable sheet polymerization portion 13A and the lower impermeable sheet polymerization portion 13B However, since it is strongly heat-welded via the connection sheet 15, even if the main impermeable structure 1a is temporarily placed moored on the sea surface for a long period of time and is affected by wind waves, the main impermeable structure It is possible to reduce the risk that the third layer protective mat 4B, the fourth layer water shield sheet 5B, and the fifth layer protective mat 4C of each multi-layer integrated water-impervious sheet 2a of the body 1a will fall off, and the initial multi-layer The structure can be retained.

Next, the impermeable structure 1b according to the second embodiment of the present invention will be described with reference to FIGS. 6 and 7. When explaining the impermeable structure 1b according to the second embodiment, only the differences from the impermeable structure 1a according to the first embodiment will be described.

In the water-impervious structure 1b according to the second embodiment, as shown in FIG. 6, at one end in the width direction (left side of FIG. 6) of the multi-layer integrated water-impervious sheet 2b, the protective mat 4A / water-impervious from above. It is composed of a laminated structure of a sheet 5A / a protective mat 4B / a branch impermeable sheet 5B'/ an impermeable sheet 5B / a protective mat 4C. As described above, at one end in the width direction of the multi-layer integrated impermeable sheet 2b, the branched impermeable sheet 5B'branched from one end of the fourth layer impermeable sheet 5B is the third layer protective mat 4B and the fourth layer. It is arranged between the eye impermeable sheet 5B and the eye. The branched geomembrane sheet 5B'is formed in a band shape. The branch impermeable sheet 5B'is made of the same material as the impermeable sheets 5A and 5B. On the other hand, at the other end in the width direction (right side of FIG. 6) of the multi-layer integrated impermeable sheet 2b, from the top, the protective mat 4A / impermeable sheet 5A / branch impermeable sheet 5A'/ protective mat 4B / impermeable sheet. It is composed of a laminated structure of 5B / protective mat 4C. At the other end in the width direction of the multi-layer integrated impermeable sheet 2b, the branched impermeable sheet 5A'branched from the other end of the second layer impermeable sheet 5A is the second layer impermeable sheet 5A and the third layer. It is arranged between the protective mat 4B and the protective mat 4B. The branch impermeable sheet 5A'is formed in a band shape. The branch impermeable sheet 5A'is also made of the same material as the impermeable sheets 5A and 5B. The water-impervious sheet 5A and the branched water-impervious sheet 5A', and the water-impervious sheet 5B and the branched water-impervious sheet 5B' may be arranged upside down with respect to the embodiment shown in FIG.

Further, in the range of A and B shown in FIG. 6, the multilayer integrated water-impervious sheet 2b is heat-welded partially or over the entire length along the longitudinal direction in addition to this. , Other parts are partially heat welded and each layer is integrated. As a result, at one end of the multi-layer integrated impermeable sheet 2b in the width direction, since the impermeable sheet 5B and the branched impermeable sheet 5B'are made of the same material, they are strongly heat-welded within the range of A. Similarly, at the other end of the multi-layer integrated impermeable sheet 2b in the width direction, since the impermeable sheet 5A and the branched impermeable sheet 5A'are made of the same material, they are strongly heat-welded within the range of B.

As described above, one end in the width direction of the multi-layer integrated impermeable sheet 2b and the other end in the width direction of the other multi-layer integrated impermeable sheet 2b are connected by a connection portion 10b. As shown in FIG. 7, the connection portion 10b is configured by superimposing the widthwise end portions of the protective mats 4A and 4A located at the first layer (upper end) of each multi-layer integrated water-impervious sheet 2b and 2b. Upper end protection mat Upper surface impermeable structure formed by superimposing the overlapping portion 12A and the widthwise end portions of the impermeable sheets 5A and 5A located on the second layer (upper side) of each multi-layer integrated impermeable sheet 2b and 2b. The sheet polymerization site 13A, the widthwise end of the protective mat 4B located in the third layer (intermediate in the vertical direction) of one of the multi-layer integrated impermeable sheets 2b, and the upper and lower sides of each multi-layer integrated impermeable sheet 2b and 2b. A branched impermeable sheet polymerization site 14 formed by superimposing the widthwise ends of the branched impermeable sheets 5A'and 5B' branching from the widthwise ends of the impermeable sheets 5A and 5B located in, and the other. It is located at the widthwise end of the protective mat 4B located in the third layer (middle in the vertical direction) of the multi-layer integrated geomembrane sheet 2b and in the fourth layer (lower side) of each multi-layer integrated water-impervious sheet 2b and 2b. Protection located on the lower geomembrane sheet polymerization site 13B, which is formed by overlapping the widthwise ends of the geomembrane sheets 5B and 5B, and the fifth layer (lower end) of each multi-layer integrated geomembrane sheet 2b and 2b. The lower end protection mat overlapping portion 12B, which is formed by overlapping the widthwise end portions of the mats 4C and 4C, is overlapped and integrated.

In addition, the upper end protection mat polymerization site 12A, the upper surface protection mat polymerization site 13A, the branch impermeable sheet polymerization site 14, the lower impermeable sheet polymerization site 13B, and the lower end protection mat polymerization site 12B of the connection site 10b in FIG. 7 are In FIG. 7, the protective mats 4A and 4C from the left side (one side), the branch impermeable sheet 5A'and the upper side of the water impervious sheet 5A and 5B, and the protective mats 4A and 4C from the right side (the other side), the branch impermeable sheet 5B. 'And the water-impervious sheets 5A and 5B are overlapped with each other. The protective mats 4A and 4C, the branched impermeable sheet 5A'and the impermeable sheets 5A and 5B may be superposed on each other, and the stacking order is particularly limited in each of the polymerization sites 12A, 13A, 14, 13B and 12B. Not done.

The connection portion 10b of each multi-layer integrated water-impervious sheet 2b and 2b is integrated by heat welding. This heat welding is performed over the entire longitudinal direction at the connection portion 10b. As a result, in the upper end protective mat polymerization portion 12A in the connection portion 10b, since the widthwise end portions of the protective mats 4A and 4A are made of the same material, they are strongly heat-welded to each other. In the upper water-impervious sheet polymerization portion 13A, since the widthwise end portions of the respective water-impervious sheets 5A and 5A are made of the same material, they are strongly heat-welded to each other. In the branched impermeable sheet polymerization site 14, since the widthwise ends of the branched impermeable sheets 5A'and 5B'are made of the same material, they are strongly heat-welded to each other. Further, in the lower impermeable sheet polymerization portion 13B, since the widthwise end portions of the respective impermeable sheets 5B and 5B are made of the same material, they are strongly heat-welded to each other. In the lower end protective mat polymerization portion 12B, since the widthwise end portions of the protective mats 4C and 4C are made of the same material, they are strongly heat-welded to each other.

Then, in the connection portion 10b of each multi-layer integrated impermeable sheet 2b and 2b, the upper impermeable sheet polymerization portion 13A and the lower impermeable sheet polymerization portion 13B are combined with the branch impermeable sheet polymerization portion 14 (impermeable sheet 5A). It is firmly connected via the welding (range A) between the and the branch impermeable sheet 5A'and the welding (range B) between the impermeable sheet 5B and the branch impermeable sheet 5B'. As a result, in the present impermeable structure 1b, there are four layers of each multi-layer integrated impermeable sheet 2b and 2b, the second layer (upper side) of the impermeable sheets 5A and 5A, and each multi-layer integrated impermeable sheet 2b and 2b. The eyes (lower side) of the water-impervious sheets 5B and 5B are welded to the upper water-impervious sheet polymerization part 13A and the branch water-impervious sheet polymerization part 14 (the water-impervious sheet 5A and the branch water-impervious sheet 5A'at the connection part 10b. (Including the range A) and the welding (range B) between the water-impervious sheet 5B and the branched water-impervious sheet 5B'), and the lower water-impervious sheet polymerization site 13B are integrally and firmly firmly connected. It should be noted that the connection portion 10b includes a protective mat 4B located in the third layer (middle in the vertical direction) of each multi-layer integrated impermeable sheet 2b, and branched impermeable sheets 5A'and 5B'located above and below the protective mat 4B. It is preferable that the water-impervious sheets 5A and 5B are heat-welded to each other, but it is not always necessary to heat-weld them in order to improve the efficiency of on-site work.

As described above, in the present impermeable structure 1b according to the second embodiment, the second layer (upper side) of the second layer (upper side) of each multi-layer integrated impermeable sheet 2b and 2b, and each multi-layer integrated impermeable sheet 5A and 5A. The fourth layer (lower side) of the sheets 2b and 2b, the water-impervious sheet 5B and 5B, are the upper water-impervious sheet polymerization part 13A and the branch impermeable sheet polymerization part 14 (the water-impervious sheet 5A and the branch shield) at the connection part 10b. Welding to the water sheet 5A'(range A) and welding (range B) between the water-impervious sheet 5B and the branched impermeable sheet 5B'), and integrally via the lower impermeable sheet polymerization site 13B. Since it is firmly connected and configured, even if the geomembrane structure 1b is moored and temporarily placed on the sea surface for a long period of time and is affected by wind waves, each layer of the geomembrane structure 1b It is possible to reduce the risk that the third-layer protective mat 4B, the fourth-layer impermeable sheet 5B, and the fifth-layer protective mat 4C of the integrated impermeable sheet 2b will fall off, and retain the original multi-layer structure. Can be done.

In the water-impervious structure 1b according to the second embodiment described above, the water-impervious sheet 5B at one end in the width direction of the multi-layer integrated water-impervious sheet 2b at a manufacturing plant that manufactures the multi-layer integrated water-impervious sheet 2b. And the branch impermeable sheet 5B'are heat-welded, and the impermeable sheet 5A and the branch impermeable sheet 5A'at the other end in the width direction of the multi-layer integrated impermeable sheet 2b are heat-welded. Heat welding is performed at the same time when the connection portion 10b connecting the widthwise ends of each multi-layer integrated geomembrane sheet 2b and 2b is heat-welded on a local land yard or a large-sized geomembrane. It is also good.

In the water-impervious structure 1b according to the second embodiment of the present invention described above, the widthwise end portion of one multi-layer integrated impermeable sheet 2b and the widthwise end portion of the other multi-layer integrated impermeable sheet 2b. The upper end and the upper end formed by superimposing the widthwise end portions of the protective mats 4A and 4A (4C, 4C) located at the upper end and the lower end of each multi-layer integrated water-impervious sheet 2b and 2b. Water-impervious sheets 5A and 5A arranged inside the lower-end protective mat polymerization sites 12A and 12B and the upper-end and lower-end protection mat polymerization sites 12A and 12B, respectively, and located on the upper and lower sides of each multi-layer integrated water-impervious sheet 2b and 2b. Three layers inside the upper and lower geomembrane sheet polymerization sites 13A and 13B, which are formed by superimposing the widthwise ends of (5B and 5B), and the upper and lower geomembrane sheet polymerization sites 13A and 13B. Multilayer-integrated geomembrane sheets 2b, 2b arranged between the widthwise ends 4B and 4B of the protective mats located in the middle in the vertical direction of the multi-layer integrated geomembrane sheets 2b and 2b. The branched impermeable sheet 5A', 5B', which is formed by superimposing the branched impermeable sheets 5A'and 5B'branched from the widthwise ends of the impermeable sheets 5A and 5B located on the upper and lower sides of the above, overlap with each other, and at least It is integrated by welding the same materials.

As described above, in the connection portion 10b of each multi-layer integrated impermeable sheet 2b and 2b in the impermeable structure 1b according to the second embodiment, the upper impermeable sheet polymerization portion 13A and the lower impermeable sheet polymerization portion 13B. , And the branch impermeable sheet polymerization site 14 (welding of the impermeable sheet 5A and the branched impermeable sheet 5A'(range A), and welding of the impermeable sheet 5B and the branched impermeable sheet 5B'(range B). Since it is firmly and integrally connected via (including), even if the present impermeable structure 1b is affected by wind waves while being moored and temporarily placed on the sea surface for a long period of time, the present impermeable structure 1b It is possible to reduce the risk that the third layer protective mat 4B, the fourth layer water shield sheet 5B, and the fifth layer protective mat 4C of each multi-layer integrated water-impervious sheet 2b will fall off, and the initial multi-layer structure can be reduced. Can be retained.

1a, 1b Impermeable Structure, 2a, 2b Multilayer Integrated Impermeable Sheet, 4A, 4B, 4C Protective Mat, 5A, 5B Impermeable Sheet, 5A', 5B' Branched Impermeable Sheet, 10a, 10b Connection Site, 12A Upper end protective mat polymerization site, 12B lower end protective mat polymerization site, 13A upper impermeable sheet polymerization site (upper impermeable sheet site), 13B lower impermeable sheet polymerization site (lower impermeable sheet site), 14 branch impermeable sheet Polymerization site, 15 connection sheet, 18 hook member

Claims (2)

The ends of the multi-layer integrated impermeable sheet, which is made by alternately stacking protective mats and impermeable sheets made of different materials and partially welding the three-layer protective mat and the two-layer impermeable sheet, are connected to each other. It is a water-impervious structure that secures a desired sheet area.
The connection portion between the end portion of one multi-layer integrated impermeable sheet and the end portion of the other multi-layer integrated impermeable sheet is in a laid state.
The upper and lower end protective mat polymerization sites formed by superimposing the end portions of the protective mats located at the upper and lower ends of each of the multilayer integrated water-impervious sheets.
Upper and lower surfaces are arranged inside the upper and lower end protective mat polymerization sites, respectively, and the upper and lower ends of the water-impervious sheet located on the upper and lower sides of the multi-layer integrated impermeable sheet are overlapped or opposed to each other. Side impermeable sheet part and
It is located inside the upper and lower geomembrane sheet portions, between the ends of the protective mats located in the middle in the vertical direction of each multi-layer integrated geomembrane sheet, and is made of the same material as the geomembrane sheet. With a strip-shaped connection sheet
Are overlapped and are integrated by welding at least the same materials.
A hook member to which a float is attached is welded to the upper water-impervious sheet portion, which is made of the same material as the water-impervious sheet, and the hook member penetrates the upper end protective mat polymerization portion and projects upward. A water-impervious structure characterized by this. The ends of the multi-layer integrated impermeable sheet, which is made by alternately stacking protective mats and impermeable sheets made of different materials and partially welding the three-layer protective mat and the two-layer impermeable sheet, are connected to each other. It is a water-impervious structure that secures a desired sheet area.
The connection portion between the end portion of one multi-layer integrated impermeable sheet and the end portion of the other multi-layer integrated impermeable sheet is in a laid state.
An upper end and lower end protective mat polymerization site formed by overlapping the ends of the protective mats located at the upper and lower ends of each of the multilayer integrated water-impervious sheets.
The upper and lower water-impervious sheets are arranged inside the upper and lower end protective mat polymerization sites, respectively, and the ends of the water-impervious sheets located on the upper and lower sides of the multi-layer integrated water-impervious sheet are overlapped with each other. Sheet polymerization site and
Inside the upper and lower geomembrane sheet polymerization sites, each multilayer is arranged between the ends of protective mats located in the middle of the vertical direction of each multi-layer integrated geomembrane sheet, which is three-dimensionally overlapped. A branched impermeable sheet polymerization site formed by superimposing a branched impermeable sheet branched from the end of the impermeable sheet located on the upper and lower sides of the integrated impermeable sheet.
Are overlapped and are integrated by welding at least the same materials.
A hook member to which a float is attached is welded to the upper water-impervious sheet polymerization site, which is made of the same material as the water-impervious sheet, and the hook member penetrates the upper end protection mat polymerization site and projects upward. An impermeable structure characterized by being present.

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