JP4043664B2

JP4043664B2 - Water shielding sheet for corner

Info

Publication number: JP4043664B2
Application number: JP27159699A
Authority: JP
Inventors: 滋夫上田; 力梅木; 澄雄板倉; 敏博出口; 文夫須藤; 忠重山口; 宏治下田; 俊治堀中
Original assignee: Taiyo Kogyo Co Ltd; Fudo Tetra Corp
Current assignee: Taiyo Kogyo Co Ltd; Fudo Tetra Corp
Priority date: 1999-09-27
Filing date: 1999-09-27
Publication date: 2008-02-06
Anticipated expiration: 2019-09-27
Also published as: JP2001087732A

Description

【０００１】
【発明の属する技術分野】
この発明は、例えば廃棄物処分場等における汚染水の拡散を防止するための遮水技術に関し、特に汚染水などの拡散を防止するための鉛直遮水構造に用いられる遮水シートに関する。
【０００２】
【従来の技術】
廃棄物処分場などでは、そこから漏れ出す汚染水の拡散を防止するために、鉛直遮水が用いられる。鉛直遮水は、廃棄物処分場の周囲を囲むようにし、且つ粘性土質の不透水層まで達するようにして遮水材を地中に立設する方式である。この鉛直遮水方式で用いる遮水材の代表的な一つとして合成樹脂製の遮水シートがある（参考技術として、特公平６−１１９９４号参照）。この種の遮水シートはそれぞれ水平長さ方向での両端部に雄型接続部と雌型接続部が取付けられ、複数枚の遮水シートを雄型接続部と雌型接続部との係合により相互に連結して所定領域を取り囲むようになっている。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような従来の技術にあっては、複数の遮水シートを水平長さ方向に連結しながら所定領域を取り囲む構造のため、連結した遮水シートの向きを変更するコーナー部では、遮水シートの柔らかさを利用して段階的に少しずつ曲げられる。そのため、どうしても大きく湾曲したコーナー部になり、シャープなコーナー部を得ることができなった。従って、四角い廃棄物処分場を取り囲むような場合も、処分場から離れた外側位置を湾曲した状態で大きく取り囲むことになるため、遮水シートの経路が長くなり、その分、遮水シートの枚数を多く必要とすると共に、作業量も増えることになる。また、地盤の状態などにより、遮水シートを打ち込む経路中において、部分的に迂回したいような領域があるような場合も、大きく湾曲した状態で迂回しなければならなため不利である。
【０００４】
この発明は、このような従来の技術に着目してなされたものであり、シャープなコーナー部が得られる遮水シートを提供するものである。
【０００５】
【課題を解決するための手段】
この発明に係る遮水シートは、シート本体の水平長さ方向での一端に第１接続部が取付けられ、他端に第２接続部が取付けられ、複数枚をそれぞれ第１接続部と第２接続部の係合により連結し、所定領域を囲むように地中へ略鉛直に打ち込むことで前記領域を遮水的に閉鎖する遮水シートにおいて、前記第１接続部と第２接続部の少なくともいずれか一方が、シート本体の水平長さ方向に対して所定の角度で取付けられている。
【０００６】
この発明によれば、第１接続部と第２接続部の少なくともいずれか一方が、シート本体の水平長さ方向に対して所定の角度で取付けられているため、この遮水シートを複数の連結された遮水シートの中に配置することにより、その角度に応じたシャープなコーナー部が得られる。第１接続部と第２接続部は、通常はいずれか一方だけが、所定の角度で取付けられるものであるが、他方側が角度をもっていることを妨げるものではない。取付角度は廃棄物処分場のコーナー部に合わせて任意角度が選択される。第１接続部と第２接続部のいずれか一方だけを所定角度で取付ける場合は、その角度を直角（９０度）にすることにより、直角用のコーナー部材が得られる。
【０００７】
角度をもたせる接続部は、シート本体に直接取付けても良いが、補助シートを介して取付けても良い。補助シートを介して取付けた方が、補助シートの柔らかさにより取付角度の微調整が容易になる。また、シート本体の端部を所定角度に折り曲げ、その端部に接続部を取付けるようにしても良い。その場合、シート本体の端部を予め曲がった状態で成形しても良いし、面状に成形した後に折り曲げ、その折り曲げ状態を補助シートの追加により保持するようにしても良い。後者の場合は、シート本体の端部を接続部ごと折り曲げて、補助シートを追加するだけなので、従来の遮水シートを利用することができる。
【０００８】
【発明の実施の形態】
この発明の好適な実施形態を図面に基づいて説明する。
【０００９】
図１〜図４は、この発明の第１実施形態を示す図である。図１及び図３は、今までの一般的な遮水シート１を示しており、この遮水シート１もコーナー部以外の部分では使用される。この遮水シート１は、上下方向に長い長方形状のシート本体２を有している（尚、図３等の斜視図では、上下長さを縮めて示してある）。このシート本体２はポリエチレン樹脂の押出成形品である。
【００１０】
このシート本体２の水平長さ方向での各端部には、第１接続部Ａと第２接続部Ｂがそれぞれ溶着されている。第１接続部Ａは先端がヤジリ状の断面形状で、第２接続部Ｂは第１接続部Ａの先端に相応する溝部を有する断面形状である。第２接続部Ｂの溝部の底部には、膨潤層３が一体的に備えられている。この膨潤層３は水を含んで膨張し、互いに係合された第１接続部Ａと第２接続部Ｂとの隙間を塞ぐ働きをする。膨潤層３は一体でなく、棒状のものを備えても良く、第１接続部Ａの先端にも膨潤層を一体的に備えても良い。このような遮水シート１は、それぞれの第１接続部Ａと第２接続部Ｂを介して図３に示すように接続して用いる。
【００１１】
次に、図２及び図４に示されているのが、この発明に係る遮水シート４である。この遮水シート４では、第１接続部Ａ′をシート本体２に対して直角にして、その端末をシート本体２に溶着している。従って、遮水シート１、４を、廃棄物処分場における鉛直遮水構造に用いる場合、その直線部では、図３に示すように、第１接続部Ａと第２接続部Ｂとを係合させて、遮水シート１同士を連結させて真っ直ぐな遮水壁を形成すれば良い。そして、遮水シート１の向きを変更する箇所においては、本実施形態の遮水シート４を用いることにより、第１接続部Ａ′の角度（９０度）に応じたシャープなコーナー部が得られる。従って、四角い廃棄物処分場を取り囲む場合も、遮廃棄物処分場に近い位置を処分場に沿った形で取り囲むことができる。そのため、遮水シート１、４の経路も短くなり、その分、遮水シート１の枚数を少なくできると共に作業量を減らせることができる。
【００１２】
図５は、この発明の第２実施形態を示す図である。この第２実施形態に係る遮水シート５では、第１接続部Ａ′を直接シート本体２に取付けず、柔らかい補助シート６を介して、シート本体２に取付けた。このようにすれば、補助シート６の柔らかさにより第１接続部Ａ′の取付角度の微調整が容易になる。
【００１３】
図６は、この発明の第３実施形態を示す図である。この第３実施形態に係る遮水シート７では、第１接続部Ａ′を、シート本体２に取付けた２枚の補助シート８、９により挟んだ状態で取付けた。しかも、２枚の補助シート８、９の端部８ａ、９ａは折り曲げた状態で、シート本体２に溶着した。このように、第１接続部Ａ′を２枚の補助シート８、９で挟み、且つ各補助シート８、９の端部８ａ、９ａを折り曲げてシート本体２に溶着したため、第１接続部Ａ′の取付強度が向上する。
【００１４】
図７は、この発明の第４実施形態を示す図である。この第４実施形態に係る遮水シート１０では、シート本体２の端部２ａを直角に折り曲げると共に、その折り曲げた端部２ａと、直角に折り曲げた第１補助シート１１とで、第１接続部Ａ′を挟んで取付ける共に、シート本体２と第１補助シート１１に平らな第２補助シート１２を取付け、シート本体２の端部２ａと第１補助シート１１とを保持した。また、第１補助シート１１と第２補助シート１２とを金具１３により結合すると共に、第２接続部Ｂとシート本体２も金具１４により結合した。この第４実施形態によれば、シート本体２の端部２ａを第１接続部Ａごと折り曲げて、第１補助シート１１及び第２補助シート１２を追加するだけなので、従来の遮水シート１を利用して製作することができる。
【００１５】
【発明の効果】
この発明によれば、第１接続部と第２接続部のいずれか一方が、シート本体の水平長さ方向に対して所定の角度で取付けられているため、この遮水シートを複数の連結された遮水シートの中に配置することにより、その角度に応じたシャープなコーナー部が得られる。
【図面の簡単な説明】
【図１】一般の遮水シートを示す平面図。
【図２】この発明の第１実施形態に係る遮水シートを示す断面図。
【図３】一般の遮水シートの連結状態を示す斜視図。
【図４】第１実施形態に係る遮水シートの連結状態を示す斜視図。
【図５】第２実施形態に係る遮水シートを示す断面図。
【図６】第３実施形態に係る遮水シートを示す断面図。
【図７】第４実施形態に係る遮水シートを示す断面図。
【符号の説明】
１遮水シート（一般）
４、５、７、１０遮水シート（本発明）
２シート本体
６、８、９、１１、１２補助シート
Ａ、Ａ′ 第１接続部
Ｂ第２接続部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water shielding technique for preventing diffusion of contaminated water in, for example, a waste disposal site, and more particularly to a water shielding sheet used in a vertical water shielding structure for preventing diffusion of contaminated water and the like.
[0002]
[Prior art]
In waste disposal sites, vertical water shielding is used to prevent the diffusion of contaminated water leaking from it. Vertical water shielding is a system in which a water shielding material is erected in the ground so as to surround the waste disposal site and to reach the impermeable layer of viscous soil. There is a water shielding sheet made of synthetic resin as a typical water shielding material used in this vertical water shielding method (refer to Japanese Patent Publication No. 6-11994 as a reference technique). This type of water shielding sheet has a male connection part and a female connection part attached to both ends in the horizontal length direction, and a plurality of water shielding sheets are engaged with the male connection part and the female connection part. Are connected to each other so as to surround a predetermined area.
[0003]
[Problems to be solved by the invention]
However, in such a conventional technique, since a plurality of water shielding sheets are connected in the horizontal length direction so as to surround a predetermined area, the corner portion that changes the direction of the connected water shielding sheets is blocked. Bending little by little using the softness of the water sheet. Therefore, the corner portion is inevitably curved and a sharp corner portion cannot be obtained. Therefore, even when surrounding a square waste disposal site, the outer position away from the disposal site is largely surrounded in a curved state, so the path of the water shielding sheet becomes longer, and the number of water shielding sheets is accordingly increased. This requires a lot of work and increases the amount of work. In addition, even when there is an area in the path where the water shielding sheet is driven in depending on the ground condition or the like, it is disadvantageous because the area must be partially curved and must be bypassed.
[0004]
This invention is made paying attention to such a prior art, and provides the water shielding sheet from which a sharp corner part is obtained.
[0005]
[Means for Solving the Problems]
The water-impervious sheet according to the present invention has a first connecting portion attached to one end in the horizontal length direction of the seat body, a second connecting portion attached to the other end, and a plurality of sheets are respectively connected to the first connecting portion and the second connecting portion. In the water-impervious sheet that is connected by the engagement of the connection portions and is closed in a water-impervious manner by driving substantially vertically into the ground so as to surround the predetermined region, at least one of the first connection portion and the second connection portion Either one is attached at a predetermined angle with respect to the horizontal length direction of the seat body.
[0006]
According to this invention, since at least one of the first connecting portion and the second connecting portion is attached at a predetermined angle with respect to the horizontal length direction of the seat body, the water shielding sheet is connected to the plurality of connecting portions. By arranging it in the water-impervious sheet, a sharp corner according to the angle can be obtained. Normally, only one of the first connection part and the second connection part is attached at a predetermined angle, but this does not prevent the other side from having an angle. An arbitrary angle is selected according to the corner of the waste disposal site. When only one of the first connection part and the second connection part is attached at a predetermined angle, a right angle corner member is obtained by setting the angle to a right angle (90 degrees).
[0007]
The connecting portion for providing an angle may be directly attached to the seat body, or may be attached via an auxiliary seat. The attachment through the auxiliary sheet facilitates fine adjustment of the attachment angle due to the softness of the auxiliary sheet. Further, the end portion of the sheet main body may be bent at a predetermined angle, and the connection portion may be attached to the end portion. In that case, the end portion of the sheet main body may be formed in a bent state in advance, or may be bent after being formed into a planar shape, and the bent state may be maintained by adding an auxiliary sheet. In the latter case, the end portion of the sheet main body is bent together with the connecting portion, and an auxiliary sheet is added, so that a conventional water shielding sheet can be used.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described with reference to the drawings.
[0009]
1 to 4 are views showing a first embodiment of the present invention. FIG.1 and FIG.3 has shown the conventional water-impervious sheet 1 until now, This water-impervious sheet 1 is also used in parts other than a corner part. The water shielding sheet 1 has a rectangular sheet body 2 that is long in the vertical direction (note that the vertical length is reduced in the perspective view of FIG. 3 and the like). This sheet body 2 is an extruded product of polyethylene resin.
[0010]
A first connection portion A and a second connection portion B are welded to each end portion of the sheet body 2 in the horizontal length direction. The first connection portion A has a cross-sectional shape having a frayed tip, and the second connection portion B has a cross-sectional shape having a groove corresponding to the tip of the first connection portion A. The swelling layer 3 is integrally provided at the bottom of the groove portion of the second connection portion B. The swelling layer 3 expands with water and functions to close the gap between the first connection portion A and the second connection portion B that are engaged with each other. The swelling layer 3 may not be integrated but may be provided with a rod shape, and the swelling layer may be integrally provided at the tip of the first connection portion A. Such a water-impervious sheet 1 is used by being connected as shown in FIG. 3 via the first connection part A and the second connection part B, respectively.
[0011]
Next, what is shown in FIGS. 2 and 4 is a water shielding sheet 4 according to the present invention. In this water-impervious sheet 4, the first connection portion A ′ is perpendicular to the sheet main body 2, and the terminal is welded to the sheet main body 2. Accordingly, when the water shielding sheets 1 and 4 are used in a vertical water shielding structure in a waste disposal site, the first connection portion A and the second connection portion B are engaged with each other at the straight portion as shown in FIG. Then, the water shielding sheets 1 may be connected to each other to form a straight water shielding wall. And in the location which changes the direction of the impermeable sheet 1, the sharp corner part according to the angle (90 degree | times) of 1st connection part A 'is obtained by using the impermeable sheet 4 of this embodiment. . Therefore, even when surrounding the square waste disposal site, it is possible to surround the position close to the shielding waste disposal site along the disposal site. Therefore, the path | route of the water-impervious sheet | seats 1 and 4 also becomes short, and can reduce the number of sheets of the water-impervious sheet | seat 1 and the work amount accordingly.
[0012]
FIG. 5 is a diagram showing a second embodiment of the present invention. In the water-impervious sheet 5 according to the second embodiment, the first connection portion A ′ is not directly attached to the seat body 2 but attached to the seat body 2 via the soft auxiliary sheet 6. If it does in this way, fine adjustment of the attachment angle of 1st connection part A 'becomes easy with the softness of the auxiliary | assistant sheet | seat 6. FIG.
[0013]
FIG. 6 is a diagram showing a third embodiment of the present invention. In the water shielding sheet 7 according to the third embodiment, the first connection portion A ′ is attached in a state of being sandwiched between the two auxiliary sheets 8 and 9 attached to the sheet main body 2. Moreover, the end portions 8a and 9a of the two auxiliary sheets 8 and 9 were welded to the sheet body 2 in a bent state. As described above, the first connection portion A ′ is sandwiched between the two auxiliary sheets 8 and 9, and the end portions 8a and 9a of the auxiliary sheets 8 and 9 are bent and welded to the sheet main body 2. The mounting strength of ′ is improved.
[0014]
FIG. 7 is a diagram showing a fourth embodiment of the present invention. In the water-impervious sheet 10 according to the fourth embodiment, the end 2a of the sheet body 2 is bent at a right angle, and the bent end 2a and the first auxiliary sheet 11 bent at a right angle are used as the first connecting portion. Attached across A ′, a flat second auxiliary sheet 12 was attached to the sheet body 2 and the first auxiliary sheet 11, and the end 2a of the sheet body 2 and the first auxiliary sheet 11 were held. Further, the first auxiliary sheet 11 and the second auxiliary sheet 12 were coupled by the metal fitting 13, and the second connecting portion B and the sheet main body 2 were also coupled by the metal fitting 14. According to this 4th Embodiment, since the edge part 2a of the sheet | seat main body 2 is bend | folded with the 1st connection part A, and only the 1st auxiliary sheet 11 and the 2nd auxiliary sheet 12 are added, the conventional water-impervious sheet 1 is used. Can be produced using.
[0015]
【The invention's effect】
According to this invention, since either one of the first connection portion and the second connection portion is attached at a predetermined angle with respect to the horizontal length direction of the seat body, a plurality of the water shielding sheets are connected. By arranging it in the water shielding sheet, a sharp corner portion corresponding to the angle can be obtained.
[Brief description of the drawings]
FIG. 1 is a plan view showing a general water shielding sheet.
FIG. 2 is a cross-sectional view showing a water shielding sheet according to the first embodiment of the present invention.
FIG. 3 is a perspective view showing a connected state of a general water shielding sheet.
FIG. 4 is a perspective view showing a connected state of the water shielding sheet according to the first embodiment.
FIG. 5 is a cross-sectional view showing a water shielding sheet according to a second embodiment.
FIG. 6 is a cross-sectional view showing a water shielding sheet according to a third embodiment.
FIG. 7 is a cross-sectional view showing a water shielding sheet according to a fourth embodiment.
[Explanation of symbols]
1 Water shielding sheet (general)
4, 5, 7, 10 Water shielding sheet (present invention)
2 Sheet body 6, 8, 9, 11, 12 Auxiliary sheet A, A '1st connection part B 2nd connection part

Claims

A first connecting part is attached to one end of the seat body in the horizontal length direction, a second connecting part is attached to the other end, and a plurality of sheets are coupled by engagement of the first connecting part and the second connecting part, In the water shielding sheet that shuts off the region in a water-impervious manner by driving it into the ground substantially vertically so as to surround the predetermined region,
At least one of said 1st connection part and 2nd connection part is attached at right angles with respect to the horizontal length direction of the said sheet | seat main body, The water shielding sheet for corner parts characterized by the above-mentioned.

The water shielding sheet for a corner portion according to claim 1, wherein at least one of the first connection portion and the second connection portion is attached to the seat body via an auxiliary sheet.

At least one of the first connection portion and the second connection portion is attached to an end portion bent at a right angle to the horizontal length direction of the seat body, and the bent state of the end portion is attached to the seat body. The water shielding sheet for a corner portion according to claim 1, which is held by an auxiliary sheet.