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JP4227498B2 - Impermeable sheet joint structure - Google Patents

Impermeable sheet joint structure Download PDF

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Publication number
JP4227498B2
JP4227498B2 JP2003375719A JP2003375719A JP4227498B2 JP 4227498 B2 JP4227498 B2 JP 4227498B2 JP 2003375719 A JP2003375719 A JP 2003375719A JP 2003375719 A JP2003375719 A JP 2003375719A JP 4227498 B2 JP4227498 B2 JP 4227498B2
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sheet
water
water shielding
impervious
sheets
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JP2005138004A (en
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深沢裕紀
橋本敦史
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Taisei Corp
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Taisei Corp
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Description

本発明は、遮水シートの接合部構造に関するものである。   The present invention relates to a joint structure of a water shielding sheet.

廃棄物処分場や貯水池などには、水を逃さないためにゴム系素材や樹脂系素材の遮水シートが敷設されているが、これらの遮水シートが損傷を受けて穴が開いてしまうと、遮水効果が得られなくなり、廃棄物処分場であれば廃棄物中の有害な成分が漏水と共に地中に漏れ出して、生活環境や生態系に何らかの悪影響を及ぼすことがある。   Waste disposal sites and reservoirs are laid with rubber-based or resin-based water-blocking sheets to prevent water from escaping, but when these water-blocking sheets are damaged and holes are opened. In the case of a waste disposal site, the water shielding effect cannot be obtained, and harmful components in the waste may leak into the ground together with water leakage, which may have some adverse effects on the living environment and ecosystem.

そこでこのような問題が生じないように、遮水シートａ自体の強度を高めたり、また遮水シートａの両面に保護シートｂ、ｂを配置して（図４）、遮水シートａを保護することが一般的に行われている。
ところで、広範囲に亘りシート材を敷設する際、小さく分割した複数のシート材を継ぎ合わせて敷設するが、この場合取付け対象箇所に予め一列にスタッドボルトｅを設けておき、ここをシートの継目部分としてシート材端部に設けた孔を挿通し、重なり合う二枚のシート材の端部を、押え金具ｃ、平座金およびナットｄで固定している。
また、そのほかにも表面を保護した各種構造の遮水シートが提案されている（例えば、特許文献１）。
特開２００２−３２６０７０号公報 Therefore, in order to prevent such problems, the strength of the water shielding sheet a itself is increased, and the protective sheets b and b are arranged on both surfaces of the water shielding sheet a (FIG. 4) to protect the water shielding sheet a. It is generally done.
By the way, when laying a sheet material over a wide range, a plurality of small divided sheet materials are laid together, and in this case, stud bolts e are provided in a row in advance in the installation target portion, and this is a joint portion of the sheet. As shown in FIG. 2, the end portions of the two sheet materials that overlap each other are fixed by the presser fitting c, the flat washer, and the nut d.
In addition, water-proof sheets having various structures that protect the surface have been proposed (for example, Patent Document 1).
JP 2002-326070 A

しかし、前記した遮水シートを保護シートで保護する接合部の構造にあっては、隣り合う片側三枚のシートを、交互に重ね合わせながら重畳して接合していたため、取付け作業が繁雑となり、作業時間が多くかかり、不経済であるという問題があった。
However, in the structure of the joint part that protects the above-described water-impervious sheet with the protective sheet, the adjacent three sheets on one side were joined while overlapping each other, so that the installation work became complicated, There was a problem that it took a lot of work and was uneconomical.

上記のような課題を解決するために、本発明の遮水シートの接合部構造は、所定領域に構築された構造物の壁面に、遮水シートを敷設するとともに、隣接する遮水シートの端部同士を重ね合わせて接合する、遮水シートの接合部構造において、前記遮水シートは芯シートの両面に保護層を被覆した三層構造とし、隣接する遮水シートの端部には、接合部に沿ってその一部を前記芯シートに固着するラップシートを設けた第一接続部と、表面に保護層を被覆しない露出部を形成した第二接続部と、を対峙させて設けて、前記第一接続部を構築物の壁面側に配置して、前記ラップシートと前記第二接続部の露出部とを接面させ、隣接する遮水シートを一体化することを特徴としたものである。   In order to solve the above-described problems, the water-impervious sheet joint structure according to the present invention includes a water-impervious sheet laid on the wall surface of a structure constructed in a predetermined region and an end of an adjacent water-impervious sheet. In the joint structure of the water shielding sheet, the parts are overlapped and joined to each other, and the water shielding sheet has a three-layer structure in which a protective layer is coated on both surfaces of the core sheet, and is joined to the end of the adjacent water shielding sheet. A first connection part provided with a wrap sheet that adheres a part thereof to the core sheet along the part and a second connection part formed with an exposed part that does not cover the protective layer on the surface are provided opposite to each other, The first connection part is arranged on the wall surface side of the structure, the exposed part of the lap sheet and the second connection part are brought into contact with each other, and the adjacent water shielding sheets are integrated. .

また、本発明の遮水シートの接合部構造は、前記した遮水シートの接合部構造において、前記構造物の壁面にスタッドボルトを配置し、前記第一接続部と第二接続部に設けた前記スタッドボルトが貫通可能な孔に、前記スタッドボルトを挿通して、積層した遮水シートの端部を押え金具を介してナットで押圧し、隣接する遮水シートを一体化することを特徴としたものである。
Moreover, the junction structure of the waterproof sheet according to the present invention is the above-described junction structure of the waterproof sheet, in which stud bolts are arranged on the wall surface of the structure, and the first connection portion and the second connection portion are provided. The stud bolt is inserted into a hole through which the stud bolt can pass, and the end portion of the laminated water-impervious sheet is pressed with a nut through a press fitting, and the adjacent water-impervious sheet is integrated. It is a thing.

本発明の遮水シートの接合部構造は、上記した課題を解決するための手段により、遮水シートの表面を保護層で被覆する三層構造から構成し、隣り合うシート間で第一接続部と第二接続部とを接合するだけであるから、取付け作業性にすぐれ、また敷設時間を短縮できる、経済的な接合構造である。
さらに、保護シートが一体に被覆してあるため、運搬やその他の取り扱い性の面でも優れる。
The junction structure of the water-impervious sheet of the present invention is constituted by a three-layer structure in which the surface of the water-impervious sheet is covered with a protective layer by means for solving the above-described problem, and the first connection portion between adjacent sheets. This is an economical joining structure that is excellent in installation workability and can reduce the laying time.
Furthermore, since the protective sheet is integrally covered, it is excellent in terms of transportation and other handling properties.

以下、図面を参照しながら本発明の実施の形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

＜１＞全体の構成
図１に、本発明の遮水シート１、２の接合部の断面を示す。
本発明に係る遮水シート１、２の接合部の構造は、遮水シート１の第一接続部１１と、隣接する遮水シート２の第二接続部２１とを接合して、両シート１、２を一体化する接合部の構造である。
第一接続部１１と第二接続部２１には、所定の間隔をおいて連通する複数の孔１６、２７を穿設し、ここに構造物の壁面に設けたスタッドボルト３２を挿入して、二枚の遮水シート１、２を接合する形態とする。
以下、本発明を構成する各部について詳述する。
<1> Overall Configuration FIG. 1 shows a cross-section of the joint portion of the water shielding sheets 1 and 2 of the present invention.
The structure of the joint part of the water-impervious sheets 1 and 2 according to the present invention is obtained by joining the first connection part 11 of the water-impervious sheet 1 and the second connection part 21 of the adjacent water-impervious sheet 2 to both sheets 1. 2 is a structure of a joint portion for integrating the two.
The first connection portion 11 and the second connection portion 21 are provided with a plurality of holes 16 and 27 that communicate with each other at a predetermined interval, and a stud bolt 32 provided on the wall surface of the structure is inserted therein. The two water-impervious sheets 1 and 2 are joined.
Hereinafter, each part which comprises this invention is explained in full detail.

＜２＞遮水シート
遮水シート１、２は、表面を保護層１４、２４で被覆した三層構造からなるシート材で、シート１、２の接合端部には、第一接続部１１若しくは第二接続部２１を設ける。
遮水シート１，２の形状は特に制約を受けないが、本例においては略矩形を呈するシートを用い、シート１、２の左右（側辺）に相当する辺にそれぞれ第一接続部１１と第二接続部２１を設ける。 <2> Water-impervious sheet The water-impervious sheets 1 and 2 are sheet materials having a three-layer structure whose surfaces are covered with the protective layers 14 and 24. A second connection portion 21 is provided.
Although the shape of the water-impervious sheets 1 and 2 is not particularly limited, in this example, a sheet having a substantially rectangular shape is used, and the first connection portion 11 and the side corresponding to the left and right (side sides) of the sheets 1 and 2 are respectively used. A second connection portion 21 is provided.

三層に積層する真中の芯シート１３、２３には、たとえば塩化ビニル、加硫ゴムシートあるいは熱可塑性エラストマーなどの素材が使用できる。
保護層１４、２４は、芯シート１３、２３を傷つけないように保護する層であり、芯シート１３、２３の表面に固着させて設ける。保護層１４、２４には、たとえばシート材や塗膜などが使用できる。
芯シート１３、２３と保護層１４、２４との固着は、素材に応じて接着、熱溶着などが選択でき、たとえば芯シート１３、２３に塩化ビニルを使用する場合、熱溶着によって固着する。 For the core sheets 13 and 23 to be laminated in three layers, for example, a material such as vinyl chloride, a vulcanized rubber sheet, or a thermoplastic elastomer can be used.
The protective layers 14 and 24 are layers that protect the core sheets 13 and 23 from being damaged, and are provided by being fixed to the surfaces of the core sheets 13 and 23. For the protective layers 14 and 24, for example, a sheet material or a coating film can be used.
Adhesion between the core sheets 13 and 23 and the protective layers 14 and 24 can be selected by adhesion, heat welding, or the like depending on the material. For example, when vinyl chloride is used for the core sheets 13 and 23, the core sheets 13 and 23 are fixed by heat welding.

遮水シート１の接続端部に設ける第一接続部１１は、シート１、２の接合部（縁部）に沿ってその一部を芯シート１３に固着させたラップシート１２を有する接合部である。
ラップシート１２には遮水構造の、たとえばシート１、２の接合部と同等の長さを有する、幅細に形成したシート材が使用でき、素材には芯シート１３と同じ素材を用いることができる。
ラップシート１２の定着は、たとえばラップシート１２の幅方向のうち、芯シート１３の外周側に相当する縁部分を、芯シート１３に固着させ、残りの部分を保護層１４に重ねる形態とできる（図１）。保護層１４に重ねる残りの部分は、必ずしも保護層１４に貼着させる必要はない。
また、反対にラップシート１２の幅方向のうち、芯シート１３の外周側に相当する縁部分を固着せずに、内方側を固着しても良い。しかし、このときには固着部分に保護層１４を被覆しないでおく。 The first connection portion 11 provided at the connection end portion of the water-impervious sheet 1 is a joint portion having a lap sheet 12 in which a part thereof is fixed to the core sheet 13 along the joint portion (edge portion) of the sheets 1 and 2. is there.
For the wrap sheet 12, a sheet material having a water-impervious structure, for example, having a length equivalent to the joint portion of the sheets 1 and 2, can be used, and the same material as the core sheet 13 can be used as the material. it can.
The wrap sheet 12 can be fixed, for example, by fixing an edge portion corresponding to the outer peripheral side of the core sheet 13 in the width direction of the wrap sheet 12 to the core sheet 13 and overlapping the remaining portion on the protective layer 14 ( FIG. 1). The remaining part of the protective layer 14 is not necessarily attached to the protective layer 14.
On the contrary, the inner side may be fixed without fixing the edge portion corresponding to the outer peripheral side of the core sheet 13 in the width direction of the wrap sheet 12. However, at this time, the protective layer 14 is not covered on the fixed portion.

第二接続部２１は、遮水シート２の表面に保護層２４を被覆しない露出部２２を設けた接続部で、前述したラップシート１２の幅と同じ幅および長さで形成するのが好ましい。
なお、本例では第二接続部２１の露出部２２を、第一接続部１１のラップシート１２の配した面と反対面に備える。 The second connecting portion 21 is a connecting portion in which the exposed portion 22 that does not cover the protective layer 24 is provided on the surface of the water shielding sheet 2, and is preferably formed with the same width and length as the width of the wrap sheet 12 described above.
In this example, the exposed portion 22 of the second connection portion 21 is provided on the surface opposite to the surface on which the wrap sheet 12 of the first connection portion 11 is arranged.

第一接続部１１と第二接続部２１には、連通する複数の孔１６，１６・・、２７、２７・・を所定ピッチで設けておき、スタッドボルト３２を挿入する孔とする。この孔１６はラップシート１２にも穿設する。
A plurality of communicating holes 16, 16,..., 27, 27,... Are provided at a predetermined pitch in the first connecting portion 11 and the second connecting portion 21, and are used as holes for inserting stud bolts 32. This hole 16 is also made in the lap sheet 12.

＜１＞取付け箇所
以下、図２を参照にしながら説明する。
本実施例は、連続して打設した鋼管矢板３、３・・の側面に、複数に分割する遮水シート１、２を横方向に敷設するものである。 <1> Attachment Location Hereinafter, description will be given with reference to FIG.
In this embodiment, the water shielding sheets 1 and 2 divided into a plurality of pieces are laid in the lateral direction on the side surfaces of the steel pipe sheet piles 3, 3.

打設する鋼管矢板３，３・・には、鉛直方向に所定の間隔を開けてＣＴ形鋼３１、３１を設けて、ＣＴ形鋼３１のフランジには複数のスタッドボルト３２、３２・・を突設させておく。
ＣＴ形鋼３１のピッチより長さの短いＲＣ版３３、３３・・を、上部からＣＴ形鋼３１、３１の間に建てこむ。所要の高さまでＲＣ版３３、３３、・・を積上げた後、鋼管矢板３とＲＣ版３３の間に生じた空間内に、間詰材３４を打設する。
こうして、遮水シート１、２を敷設する構造物壁面を構築する。
The steel pipe sheet piles 3, 3... Are provided with CT sections 31, 31 at predetermined intervals in the vertical direction, and a plurality of stud bolts 32, 32. Leave it protruding.
RC plates 33, 33,... Shorter than the pitch of the CT section 31 are built between the CT sections 31, 31 from above. After the RC plates 33, 33,... Are piled up to a required height, a filling material 34 is placed in the space formed between the steel pipe sheet pile 3 and the RC plate 33.
In this way, the structure wall surface on which the water shielding sheets 1 and 2 are laid is constructed.

＜２＞遮水シート（一枚目）の取付け
次に、予め所要の形状に作製した遮水シート１、２を、順次、構造物壁面に取り付けてゆく。
現場へ搬入した遮水シート１の上辺の孔１５に、トラバーサ４（吊上げ治具）に設けたフック４１を引掛け、クレーンを用いて遮水シート１を所要の位置へ運ぶ。
遮水シート１の左右に穿設する孔１６、１７を、スタッドボルト３２に挿入して、遮水シート１を構造物壁面に取付ける。このとき第一接続部１１のラップシート１２が、遮水シート１右側の表側（取付け箇所と反対側）にくるように配置する。遮水シート１は、必要に応じて仮止めを行っても良い。
こうして、一枚目の遮水シート１を取付ける。
<2> Attaching the water-impervious sheet (first sheet) Next, the water-impervious sheets 1 and 2 prepared in a required shape in advance are sequentially attached to the wall surface of the structure.
A hook 41 provided on the traverser 4 (lifting jig) is hooked in the hole 15 on the upper side of the water-impervious sheet 1 carried into the site, and the water-impervious sheet 1 is carried to a required position using a crane.
Holes 16 and 17 drilled to the left and right of the water-impervious sheet 1 are inserted into the stud bolts 32, and the water-impervious sheet 1 is attached to the structure wall surface. At this time, it arrange | positions so that the lap | wrap sheet | seat 12 of the 1st connection part 11 may come to the front side (opposite side of an attachment location) of the water-impervious sheet 1 right side. The water shielding sheet 1 may be temporarily fixed as necessary.
In this way, the first water shielding sheet 1 is attached.

＜３＞遮水シート（二枚目）の敷設
遮水シート１を仮固定した後、次の遮水シート２を同様の要領で所要の取付け位置まで移動させる。本形態においては、次に敷設する遮水シート２を、先に取付けた遮水シート１の向かって右側へ配置する。二枚目の遮水シート２は、左辺に第二接続部２１がくるようにする。また、露出部２２を遮水シート１のラップシート１２に接面するような配置とする。
第二接続部２１に設けた孔２７をスタッドボルト３２に挿入し、遮水シート１，２の端部を重ねる。このとき、ラップシート１２と露出部２２との接面には、所要の貼着手段を用いて連結しても良い。 <3> Laying of the water-impervious sheet (second sheet) After temporarily fixing the water-impervious sheet 1, the next water-impervious sheet 2 is moved to the required mounting position in the same manner. In this embodiment, the water shielding sheet 2 to be laid next is arranged on the right side of the water shielding sheet 1 attached first. The second water-impervious sheet 2 is such that the second connection portion 21 is on the left side. Further, the exposed portion 22 is arranged so as to contact the wrap sheet 12 of the water shielding sheet 1.
The hole 27 provided in the second connection portion 21 is inserted into the stud bolt 32 and the end portions of the water shielding sheets 1 and 2 are overlapped. At this time, you may connect to the contact surface of the lap sheet 12 and the exposed part 22 using a required sticking means.

つぎに、このスタッドボルト３２に、断面ハット型の押え金具５、座金３３を挿入し、ナット３４を螺合して押圧する。こうして、二枚の遮水シート１、２を接合して、所要の壁面Ｗに固定する。   Next, the cross-sectional hat-type presser fitting 5 and the washer 33 are inserted into the stud bolt 32, and the nut 34 is screwed and pressed. In this way, the two water-impervious sheets 1 and 2 are joined and fixed to the required wall surface W.

第一接続部１１と第二接続部２１を接合すると、遮水性の芯シート１３、２３とラップシート１２が連続して接面することにより、断面略Ｚ型の遮水構造を形成する（図３）。
これは、たとえばナット３４の締め付けが弱く、遮水シート１、２の取り付け側から、第一接続部１１と第二接続部２１の隙間に水が浸入した場合でも（矢印）、芯シート１３とラップシート１２との固着部分で水を捕らえるため、漏洩を防止することができる。
また、万一、二枚の遮水シート１、２がずれて接合され、同幅に構成するラップシート１２と露出部２２とが完全に重ならずに、表面から見てラップシート１２の一部が露出したような接合状態になる場合でも（図示せず）、接合部の保護は図れる。これは、ラップシート１２の裏面に位置する芯シート１３の表面が、保護層１４で被覆されているからである。つまり、ラップシート１２が破れようとも、常に後ろから保護層１４が現れて、芯シート１３を保護することができる。一方、遮水シート２の露出部２２には、壁面Ｗ側より埋戻し用の砕石などがぶつかり、傷つく心配がないため、接合部の構造は保持できる。 When the first connection portion 11 and the second connection portion 21 are joined, the water-impervious core sheets 13 and 23 and the wrap sheet 12 are continuously in contact with each other, thereby forming a water-blocking structure having a substantially Z-shaped cross section (see FIG. 3).
For example, even when the nut 34 is weakly tightened and water enters the gap between the first connection portion 11 and the second connection portion 21 from the side where the water shielding sheets 1 and 2 are attached (arrow), the core sheet 13 and Since water is captured at the portion fixed to the wrap sheet 12, leakage can be prevented.
Also, in the unlikely event that the two water-impervious sheets 1 and 2 are offset and joined, the wrap sheet 12 and the exposed portion 22 that are configured to have the same width do not completely overlap, and one of the wrap sheets 12 is viewed from the surface. Even in a joined state where the part is exposed (not shown), the joined part can be protected. This is because the surface of the core sheet 13 located on the back surface of the wrap sheet 12 is covered with the protective layer 14. That is, even if the wrap sheet 12 is torn, the protective layer 14 always appears from the back, and the core sheet 13 can be protected. On the other hand, the exposed portion 22 of the water-impervious sheet 2 is not worried that it will be damaged by crushed stones for backfilling from the wall surface W side, so that the structure of the joint portion can be maintained.

隣り合う遮水シート１、２を接合した後、各遮水シート１，２の上辺に設ける孔１５も、押え金具、座金、ナットでスタッドボルトに固定する。かかる端部の構造は、補強のためにシートを折り返した構造とするのが好ましい。
以降、同様の手順を繰り返してゆき、隣り合う遮水シートを接合しつつ、取り付け箇所へ敷設してゆく。 After joining the adjacent water-impervious sheets 1 and 2, the holes 15 provided on the upper sides of the respective water-impervious sheets 1 and 2 are also fixed to the stud bolts with presser fittings, washers and nuts. The end structure is preferably a structure in which the sheet is folded for reinforcement.
Thereafter, the same procedure is repeated, and the adjacent water-impervious sheets are joined and laid at the attachment location.

以上、説明した遮水シートの接合部は、遮水シートの左右に設けた形態であったが、この接合部は遮水シートの上下に設けても良い。この場合、第一接続部と第二接続部をそれぞれ遮水シートの上下端部に設けて、同様の手順で接合すれば良い。
As mentioned above, although the junction part of the water shielding sheet demonstrated was a form provided in the right and left of the water shielding sheet, this junction part may be provided in the upper and lower sides of a water shielding sheet. In this case, a 1st connection part and a 2nd connection part may be provided in the upper-lower-end part of a water-impervious sheet, respectively, and what is necessary is just to join in the same procedure.

本発明の遮水シートの接合部構造の実施例の断面図。Sectional drawing of the Example of the junction part structure of the water-impervious sheet of this invention. 遮水シートの実施例の説明図。Explanatory drawing of the Example of a water shielding sheet. 遮水シート接合部の取り合い詳細図。Detailed view of the joint of the water shielding sheet joint. 従来の遮水シートの接合部の構造を示した断面図。Sectional drawing which showed the structure of the junction part of the conventional water shielding sheet.

符号の説明Explanation of symbols

１・・・遮水シート
２・・・遮水シート
１１・・第一接続部
１２・・ラップシート
１３・・芯シート
１４・・保護層
２１・・第二接続部
２２・・露出部
２３・・芯シート
２４・・保護層 DESCRIPTION OF SYMBOLS 1 ... Water shielding sheet 2 ... Water shielding sheet 11 ... First connection part 12 Wrap sheet 13 Core sheet 14 Protective layer 21 Second connection part 22 Exposed part 23・ Core sheet 24 ・ ・ Protective layer

Claims (2)

所定領域に構築された構造物の壁面に、遮水シートを敷設するとともに、隣接する遮水シートの端部同士を重ね合わせて接合する、遮水シートの接合部構造において、
前記遮水シートは芯シートの両面に保護層を被覆した三層構造とし、
隣接する遮水シートの端部には、接合部に沿って一部を前記芯シートに固着するラップシートを設けた第一接続部と、表面に保護層を被覆しない露出部を形成した第二接続部と、を対峙させて設けて、
前記第一接続部を構築物の壁面側に配置して、前記ラップシートと前記第二接続部の露出部とを接面し、隣接する遮水シートを一体化することを特徴とした、
遮水シートの接合部構造。
In the joint structure of the water shielding sheet, in which the water shielding sheet is laid on the wall surface of the structure constructed in the predetermined region and the ends of the adjacent water shielding sheets are overlapped and joined together,
The water shielding sheet has a three-layer structure in which a protective layer is coated on both sides of the core sheet,
A second connecting portion provided with a lap sheet that partially adheres to the core sheet along the joining portion and an exposed portion that does not cover the protective layer are formed on the end portion of the adjacent water shielding sheet. Provide the connection part facing each other,
The first connection part is arranged on the wall surface side of the structure, the exposed part of the lap sheet and the second connection part is brought into contact with each other, and the adjacent water shielding sheet is integrated.
Joint structure of water shielding sheet.
請求項１に記載する遮水シートの接合部構造において、
前記構造物の壁面にスタッドボルトを配置し、
前記第一接続部と第二接続部に設けた前記スタッドボルトが貫通可能な孔に、前記スタッドボルトを挿通して、
積層した遮水シートの端部を押え金具を介してナットで押圧し、隣接する遮水シートを一体化することを特徴とした、
遮水シートの接合部構造。 In the junction structure of the impermeable sheet according to claim 1,
Place stud bolts on the wall of the structure,
The stud bolt is inserted into a hole through which the stud bolt provided in the first connection portion and the second connection portion can pass,
The end of the laminated water-impervious sheet was pressed with a nut through a press fitting, and the adjacent water-impervious sheet was integrated,
Joint structure of water shielding sheet.
JP2003375719A 2003-11-05 2003-11-05 Impermeable sheet joint structure Expired - Fee Related JP4227498B2 (en)

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JP4227498B2 true JP4227498B2 (en) 2009-02-18

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JP6990625B2 (en) * 2018-06-08 2022-01-12 東洋建設株式会社 Impermeable structure
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