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JP5038281B2 - Water-stop structure, construction method thereof, and method of water-stopping anchor penetration part of water-impervious member - Google Patents

Water-stop structure, construction method thereof, and method of water-stopping anchor penetration part of water-impervious member Download PDF

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JP5038281B2
JP5038281B2 JP2008274394A JP2008274394A JP5038281B2 JP 5038281 B2 JP5038281 B2 JP 5038281B2 JP 2008274394 A JP2008274394 A JP 2008274394A JP 2008274394 A JP2008274394 A JP 2008274394A JP 5038281 B2 JP5038281 B2 JP 5038281B2
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water
anchor
water stop
stopping
stop structure
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JP2010101090A (en
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一三 小林
克 戸井田
誠門 中嶌
康祐 横関
剛 取違
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Kajima Corp
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Description

本発明は、遮水部材のアンカー貫通部を止水するための止水構造及びその構築方法、並びに、遮水部材のアンカー貫通部を止水する方法に関する。   The present invention relates to a water stop structure for stopping an anchor penetration portion of a water shielding member, a construction method thereof, and a method for water stopping an anchor penetration portion of a water shielding member.

コンクリート構造物は、一般に、現場で型枠を設置し、その中にコンクリートを流し込み、コンクリートが硬化した後に型枠を取り除くことによって構築される。コンクリート打設用の型枠は複数の枠板によって形成され、枠板同士はセパレータと呼ばれる棒状部材によって互いに固定される。セパレータはコンクリート構造物を貫通する状態でコンクリート内に残留するため、セパレータとコンクリートとの界面に間隙が生じると、そこから漏水が発生しやすいことが知られている（下記特許文献１を参照）。   A concrete structure is generally constructed by installing a formwork on site, pouring concrete into it and removing the formwork after the concrete has hardened. The concrete casting form is formed by a plurality of frame plates, and the frame plates are fixed to each other by a bar-like member called a separator. Since the separator remains in the concrete in a state of penetrating the concrete structure, it is known that when a gap occurs at the interface between the separator and the concrete, water leakage is likely to occur therefrom (see Patent Document 1 below). .

特許文献１に記載の発明は、コンクリート型枠セパレータの止水方法及びそれに用いる止水材に関するものである。特許文献１には、止水材に含有せしめる水膨潤性粘土としてベントナイトが例示されている。また、下記特許文献２には、ベントナイト等を含有する粘土状塑性体を用いて管推進工坑口における止水を行う方法が記載されている。
特開２００２−１３２９３号公報 特開平０６−２８０４７３号公報 The invention described in Patent Document 1 relates to a water stop method for a concrete mold separator and a water stop material used therefor. Patent Document 1 exemplifies bentonite as water-swellable clay to be contained in the waterstop material. Moreover, the following patent document 2 describes a method for stopping water at a pipe propulsion wellhead using a clay-like plastic body containing bentonite or the like.
JP 2002-13293 A Japanese Patent Laid-Open No. 06-280473

ところで、放射性廃棄物処分場や高速道路などの土木構造物及び基礎などの建築物を地下に構築する場合、地下水の浸入などを防止する目的で構造物の周囲に覆工コンクリート、遮水シートなどが設置される。これらの遮水部材は、アンカーによって周辺地盤や岩盤に固定される。また、地下に設置する構造躯体を周辺地盤や岩盤に固定するのに、アンカーを使用する場合もある。   By the way, when building civil engineering structures such as radioactive waste disposal sites and highways and buildings such as foundations underground, lining concrete, water shielding sheets, etc. around the structure in order to prevent infiltration of groundwater, etc. Is installed. These water-impervious members are fixed to the surrounding ground or rock by anchors. In addition, anchors may be used to fix the structural frame installed in the basement to the surrounding ground or rock.

遮水部材や構造躯体を固定するアンカーは、通常、遮水部材を貫通して設けられるものであるため、遮水部材の貫通部から漏水が生じやすい。当該貫通部の周囲に上記特許文献１，２に記載の止水材を配置すれば、一定の止水効果が期待できる。しかし、従来の止水材は止水性能の点で未だ改善の余地があった。   Since the anchor for fixing the water shielding member and the structural frame is usually provided through the water shielding member, water leakage is likely to occur from the penetration portion of the water shielding member. If the water-stopping material described in Patent Documents 1 and 2 is arranged around the penetrating portion, a certain water-stopping effect can be expected. However, conventional water-stopping materials still have room for improvement in terms of water-stopping performance.

本発明は、このような実情に鑑みてなされたものであり、遮水部材の貫通部において十分に高い止水性能を長期にわたって維持できる止水構造を提供することを目的とする。また、本発明は、上記止水構造の構築方法、並びに、これを用いた遮水層アンカー貫通部の止水方法を提供することを目的とする。   This invention is made | formed in view of such a situation, and it aims at providing the water stop structure which can maintain a sufficiently high water stop performance over a long period in the penetration part of a water-blocking member. Moreover, this invention aims at providing the construction method of the said water stop structure, and the water stop method of the impermeable layer anchor penetration part using the same.

本発明は、アンカー設置用削孔を有する施工面上に設けられる止水構造であって、アンカー設置用削孔に設置されたアンカーと、アンカー設置用削孔の近傍を覆わないように施工面上に設けられた遮水部材と、アンカー設置用削孔の近傍の施工面を覆うように形成され、ベントナイトを含有する止水層と、止水層の表面と当接する当接面を有し、アンカーによって施工面上に固定される止水層封止部材とを備えることを特徴とする止水構造を提供する。   The present invention relates to a water stop structure provided on a construction surface having an anchor installation drilling hole, and the construction surface so as not to cover the anchor installed in the anchor installation drilling hole and the vicinity of the anchor installation drilling hole. A water-blocking member provided above, a water-stopping layer containing bentonite formed so as to cover the construction surface in the vicinity of the anchor installation hole, and a contact surface that comes into contact with the surface of the water-stopping layer And a water-stop layer sealing member fixed on the construction surface by an anchor.

本発明に係る止水構造によれば、遮水部材の貫通部において十分に高い止水性能を長期にわたって維持できる。このような効果が奏される主因は以下の通りである。すなわち、一定の密度に締め固めたベントナイトは水を通しにくく、止水材料としての機能を有する。また、ベントナイトは自然界に存在する鉱物で化学的に安定したものであるとともに、吸水すると膨潤する性質を有する。上記止水構造にあっては、ベントナイトを含有する止水材料が封止されてなる止水層がアンカー設置用削孔の近傍に形成されている。このような封入されたベントナイトにアンカー設置用削孔又は施工面を通じて水が止水層に浸入するとベントナイトが膨潤するが、構造上体積変化できないため膨潤圧力が生じる。この圧力は、施工面やアンカーボルトと止水層の境界に止水層を密着させるように作用する。これによって、アンカー設置用削孔及び施工面からの出水が抑制される。また、天然材料であるため、長期にわたって止水性能を発揮する。   According to the water stop structure according to the present invention, a sufficiently high water stop performance can be maintained over a long period of time at the penetration portion of the water shielding member. The main reasons for such an effect are as follows. That is, bentonite compacted to a certain density is difficult to pass water and has a function as a water-stopping material. Bentonite is a naturally occurring mineral that is chemically stable and swells when absorbed. In the water stop structure, a water stop layer formed by sealing a water stop material containing bentonite is formed in the vicinity of the anchor installation hole. When water enters the water-stopping layer through the anchored drilling hole or the construction surface into the enclosed bentonite, the bentonite swells, but a swelling pressure is generated because the structure cannot change the volume. This pressure acts to bring the water stop layer into close contact with the construction surface and the boundary between the anchor bolt and the water stop layer. This suppresses water from the anchor installation hole and the construction surface. In addition, since it is a natural material, it exhibits water-stopping performance over a long period of time.

また、本発明は、アンカー設置用削孔を有する施工面上に止水構造を構築する方法であって、アンカー設置用削孔の近傍を覆わないように施工面上に遮水部材を設ける工程と、アンカー設置用削孔にアンカーを設置した後、アンカー設置用削孔の近傍の施工面を覆うように、ベントナイトを含有する止水層を形成する工程と、止水層の表面と当接する当接面を有する止水層封止部材をアンカーによって固定し、止水層を封止する工程とを備えることを特徴とする止水構造の構築方法を提供する。これらの工程を経ることによって、上記本発明の止水構造を構築することができる。   Further, the present invention is a method for constructing a water stop structure on a construction surface having an anchor installation drilling hole, and a step of providing a water shielding member on the construction surface so as not to cover the vicinity of the anchor installation drilling hole And after the anchor is installed in the anchor installation hole, the step of forming a water stop layer containing bentonite so as to cover the construction surface in the vicinity of the anchor installation hole and the surface of the water stop layer abut And a step of fixing a water-stopping layer sealing member having an abutment surface with an anchor and sealing the water-stopping layer. By passing through these steps, the water stop structure of the present invention can be constructed.

また、本発明は、アンカー設置用削孔を有する施工面上に、上記本発明の止水構造を構築することによって遮水部材のアンカー貫通部を止水する方法を提供する。この方法によれば、遮水部材の貫通部を長期にわたって止水することができる。   Moreover, this invention provides the method of water-stopping the anchor penetration part of a water-impervious member by constructing the water stop structure of the said invention on the construction surface which has a drilling hole for anchor installation. According to this method, the penetrating portion of the water shielding member can be stopped for a long time.

本発明によれば、遮水部材の貫通部において十分に高い止水性能を長期にわたって維持できる。   According to the present invention, sufficiently high water stopping performance can be maintained over a long period of time at the penetrating portion of the water shielding member.

以下、図面を参照しつつ本発明の好適な実施形態について詳細に説明する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

＜止水構造＞
図１は、本実施形態に係る止水構造を示す模式断面図である。同図に示す止水構造１０は、坑道１内に構築される土木構造物（図示せず）に対する浸水を防止するために設けられたものである。止水構造１０は、坑道１の壁面（施工面）１ａ上のアンカー設置用削孔１ｂが形成された位置に設置される。なお、坑道１内には、所定の間隔でアンカー設置用削孔１ｂが形成されており、各アンカー設置用削孔１ｂに止水構造１０がそれぞれ設けられる。 <Water stop structure>
FIG. 1 is a schematic cross-sectional view showing a water stop structure according to the present embodiment. The water stop structure 10 shown in the figure is provided to prevent inundation of a civil engineering structure (not shown) constructed in the mine shaft 1. The water stop structure 10 is installed at the position where the anchor installation hole 1b is formed on the wall surface (construction surface) 1a of the mine shaft 1. In addition, anchor installation holes 1b are formed in the tunnel 1 at predetermined intervals, and a water stop structure 10 is provided in each anchor installation hole 1b.

止水構造１０は、アンカー設置用削孔１ｂに設置されたアンカー２と、アンカー設置用削孔１ｂの近傍を覆わないように壁面１ａ上に設けられた一次覆工（遮水部材）３と、アンカー２によって壁面１ａ上に固定される二次覆工（止水層封止部材）５と、一次覆工３が設けられていないアンカー設置用削孔１ｂの近傍の壁面１ａを覆うように形成された止水層８とを備える。なお、アンカー２は先端側にネジ切を有し、プレート２ａを介してナット２ｂによって二次覆工５を壁面１ａの方向に押し当てて固定できるようになっている。   The water stop structure 10 includes an anchor 2 installed in the anchor installation hole 1b, and a primary lining (water shielding member) 3 provided on the wall surface 1a so as not to cover the vicinity of the anchor installation hole 1b. The secondary lining (water blocking layer sealing member) 5 fixed on the wall surface 1a by the anchor 2 and the wall surface 1a in the vicinity of the anchor installation hole 1b where the primary lining 3 is not provided are covered. And a formed water-stopping layer 8. The anchor 2 has a threaded end on the tip side, and can be fixed by pressing the secondary lining 5 in the direction of the wall surface 1a with a nut 2b through a plate 2a.

図１に示すように、止水層８は、壁面１ａ、一次覆工３の側面３ａ及び二次覆工５の一方面（当接面）５ａによって形成される空間内に形成されたものである。止水層８は、水を吸収する膨潤する性質を有するベントナイトを含有する止水材料からなる。ベントナイトを含有する止水材料を上記の空間に封止して体積を拘束すると、水が止水層８に浸入したときに、ベントナイトの膨潤に伴う止水性能の低下を防ぐことができる。この効果によって壁面１ａと一次覆工３との間及びアンカー設置用削孔１ｂからの出水が抑制される。   As shown in FIG. 1, the water blocking layer 8 is formed in a space formed by the wall surface 1 a, the side surface 3 a of the primary lining 3, and one surface (abutment surface) 5 a of the secondary lining 5. is there. The water-stopping layer 8 is made of a water-stopping material containing bentonite having a swelling property that absorbs water. When the water-stopping material containing bentonite is sealed in the above-described space to restrict the volume, when water enters the water-stopping layer 8, it is possible to prevent the water-stopping performance from being lowered due to the swelling of bentonite. By this effect, water discharge between the wall surface 1a and the primary lining 3 and the anchor installation hole 1b is suppressed.

止水材料の調製に使用するベントナイトとして、ベントナイト原鉱石から製造したものが挙げられる。止水材料に配合するベントナイトの量は、止水構造１０に対して要求される止水性能に応じて適宜設定すればよい。   The bentonite used for the preparation of the water-stopping material includes those produced from bentonite raw ore. What is necessary is just to set suitably the quantity of the bentonite mix | blended with a water stop material according to the water stop performance requested | required with respect to the water stop structure 10. FIG.

坑道１内に構築される土木構造物が、例えば放射性廃棄物処分場である場合、止水構造１０は高度な止水性能が要求される。このため、止水材料に含まれる固形分中のベントナイトの含有量は３０質量％以上（固形分の質量基準）であることが好ましく、７０質量％以上であることがより好ましい。更には、固形分が実質的にベントナイトのみからなることが最も好ましい。ベントナイトの含有量が３０質量％未満であると、３０質量％以上の場合と比較して、形成される止水層の止水性能が低くなる傾向にある。   When the civil engineering structure constructed in the mine shaft 1 is, for example, a radioactive waste disposal site, the water stopping structure 10 is required to have a high level of water stopping performance. For this reason, it is preferable that the content of bentonite in the solid content contained in the water-stopping material is 30% by mass or more (based on the mass of the solid content), and more preferably 70% by mass or more. Furthermore, it is most preferable that the solid content consists essentially of bentonite. When the content of bentonite is less than 30% by mass, the water-stopping performance of the water-stopping layer formed tends to be lower than that in the case of 30% by mass or more.

なお、止水材料に含まれる固形分中のベントナイトの含有率３０質量％未満の場合であっても、一定の止水性能が得ることができる。ただし、ベントナイトの当該含有率が５質量％未満の場合は、止水性能が不十分となりやすい。固形分に含まれるベントナイト以外の成分としては、砂や土などが挙げられる。   In addition, even if it is a case where the content rate of the bentonite in solid content contained in a water stop material is less than 30 mass%, fixed water stop performance can be obtained. However, if the content of bentonite is less than 5% by mass, the water stop performance tends to be insufficient. Examples of components other than bentonite contained in the solid content include sand and soil.

一般に、固形分中のベントナイトの含有率が高いほど、高い止水性能を得ることができる。固形分中のベントナイトの含有率の設定については、周辺の地盤や岩盤の透水特性や出水の状況から、適当な値を設定することが望ましい。   Generally, the higher the content of bentonite in the solid content, the higher the water stop performance. Regarding the setting of the bentonite content in the solid content, it is desirable to set an appropriate value from the water permeability characteristics of the surrounding ground and rock mass and the situation of water discharge.

ベントナイトの含有率が９５質量％以上の固形分を使用する場合、止水材料の含水比は１５〜３０％の範囲であることが好ましい。当該含水比が１５％未満であると、止水材料の付着性が不十分となり、吹付け工法によって止水層８を形成しにくくなる。他方、当該含水比が３０％を超えると、止水層８の密度が不十分となりやすい。止水材料の含水比の下限は、１６％であることが好ましく、１７％であることがより好ましい。また、止水材料の含水比の上限は、２９％であることが好ましく、２８％であることがより好ましく、２７％であることが更に好ましい。   When using the solid content with a bentonite content of 95% by mass or more, the water content of the water-stopping material is preferably in the range of 15 to 30%. If the water content is less than 15%, the adhesion of the water-stopping material becomes insufficient, and it becomes difficult to form the water-stopping layer 8 by the spraying method. On the other hand, when the water content ratio exceeds 30%, the density of the water blocking layer 8 tends to be insufficient. The lower limit of the water content ratio of the water stop material is preferably 16%, and more preferably 17%. Further, the upper limit of the water content ratio of the water stop material is preferably 29%, more preferably 28%, and further preferably 27%.

ここで、止水材料の含水比ｗ（％）は、下記式（１）で定義されるものである。式中、ＷＷは止水材料に含まれる水の質量、ＷＳは止水材料に含まれるベントナイトや砂などの固形分の質量をそれぞれ示す。
ｗ＝（ＷＷ／ＷＳ）×１００ （１） Here, the water content ratio w (%) of the water-stopping material is defined by the following formula (1). In the formula, W W is the mass of water contained in the water stop material, W S is a solid mass such as bentonite and sand contained in the water cutoff material respectively.
w = (W W / W S ) × 100 (1)

本実施形態に係る止水構造１０によれば、二次覆工５が止水層８の蓋の役割を果たし、止水層８の体積を拘束するとともに、止水材料の逸散を防止するため、一次覆工３が形成されていない部分（遮水部材の貫通部）において十分に高い止水性能を長期にわたって維持できる。したがって、止水構造１０は、アンカー設置用削孔１ｂを有する壁面１ａを止水する方法として好適である。なお、止水性能をより一層向上させるため、止水層８と当接するアンカー２の部分にネジ切を施してもよい。かかる構成を採用することにより、アンカー２と止水層８との間からの出水を一層確実に防止できる。また、一次覆工３の側面３ａに対し、表面を粗くする加工を施してもよい。かかる構成を採用することにより、一次覆工３と止水層８との間からの出水を一層確実に防止できる。   According to the water stop structure 10 according to the present embodiment, the secondary lining 5 serves as a lid for the water stop layer 8, restricts the volume of the water stop layer 8, and prevents the water stop material from escaping. Therefore, a sufficiently high water stopping performance can be maintained over a long period in a portion where the primary lining 3 is not formed (a penetration portion of the water shielding member). Therefore, the water stop structure 10 is suitable as a method for water stopping the wall surface 1a having the anchor installation hole 1b. In order to further improve the water stop performance, the portion of the anchor 2 that contacts the water stop layer 8 may be threaded. By adopting such a configuration, it is possible to more reliably prevent water from flowing between the anchor 2 and the water blocking layer 8. In addition, the side surface 3a of the primary lining 3 may be processed to make the surface rough. By adopting such a configuration, it is possible to more reliably prevent water from flowing between the primary lining 3 and the water blocking layer 8.

＜止水構造の構築方法＞
止水構造１０は、以下のようにして構築することができる。まず、アンカー設置用削孔１ｂの近傍を覆わないように壁面１ａ上に一次覆工３を設ける（図２参照）。一次覆工３は、例えば、コンクリートを打設することによって敷設することができる。その際、一次覆工３を形成しない部分に型枠を入れ、当該部分にコンクリートが回らないようにすればよい。なお、コンクリートの代わりにＳＭＷ（Soil Mixing Wall）によって一次覆工３を形成してもよい。 <How to build a water stop structure>
The water stop structure 10 can be constructed as follows. First, the primary lining 3 is provided on the wall surface 1a so as not to cover the vicinity of the anchor installation hole 1b (see FIG. 2). The primary lining 3 can be laid, for example, by placing concrete. At that time, a formwork may be put in a portion where the primary lining 3 is not formed so that the concrete does not turn around the portion. In addition, you may form the primary lining 3 with SMW (Soil Mixing Wall) instead of concrete.

一次覆工３の厚さは、止水層８の厚さと同じであるため、要求される止水性能に応じて適宜設定すればよいが、数ｃｍ〜数十ｃｍ程度とすることが好ましい。また、一次覆工３を形成しない部分は、要求される止水性能に応じてその範囲を適宜設定すればよいが、アンカー設置用削孔１ｂを中心として、半径数ｃｍ〜数十ｃｍ程度の範囲とすることが好ましい。なお、当該部分の形状は円形に限られず、矩形等であってもよい。   Since the thickness of the primary lining 3 is the same as the thickness of the water blocking layer 8, it may be set as appropriate according to the required water blocking performance, but is preferably about several centimeters to several tens of centimeters. Moreover, the part which does not form the primary lining 3 should just set the range suitably according to the water stop performance requested | required, but centering on the anchor installation drilling hole 1b, a radius of about several centimeters to several tens of centimeters is sufficient. It is preferable to be in the range. In addition, the shape of the said part is not restricted circular, A rectangle etc. may be sufficient.

アンカー設置用削孔１ｂにセメント等を使用してアンカー２を設置した後、アンカー設置用削孔１ｂの近傍の壁面１ａを覆うように、止水層８を形成する（図３，４参照）。止水層８の形成方法は、壁面１ａ及び一次覆工３の側面３ａによって形成される領域に止水材料をある程度高い密度で充填できれば、吹付け工法、止水材料からなるブロックを定置する方法、粘土状の止水材料を詰め込む方法などを採用できる。ただし、高い密度の止水層８を効率的に形成する観点から、吹付け工法によって止水層８の形成を行うことが好ましい。図３は、ホース１１の先端に設けられたノズル１２から止水材料を噴射して止水層８の形成を行っている状態を示したものである。   After installing the anchor 2 using cement or the like in the anchor installation hole 1b, a water blocking layer 8 is formed so as to cover the wall surface 1a in the vicinity of the anchor installation hole 1b (see FIGS. 3 and 4). . The method of forming the water-stopping layer 8 is a spraying method or a method of placing a block made of the water-stopping material if the water-stopping material can be filled to a region formed by the wall surface 1a and the side surface 3a of the primary lining 3 with a certain high density. A method of stuffing clay-like waterstop material can be adopted. However, it is preferable to form the water blocking layer 8 by a spraying method from the viewpoint of efficiently forming the high density water blocking layer 8. FIG. 3 shows a state in which a water-stopping layer 8 is formed by spraying a water-stopping material from a nozzle 12 provided at the tip of the hose 11.

止水層８を形成し、図４に示す状態とした後、一次覆工３及び止水層８を覆うように二次覆工５を敷設する。二次覆工５としては、プレキャストコンクリート等を使用できる。アンカー２、プレート２ａ及びナット２ｂによって二次覆工５を壁面１ａの方向に押し当てることによって、止水層８を封止する。このようにして図１に示す止水構造１０が構築される。   After the water blocking layer 8 is formed and brought into the state shown in FIG. 4, the secondary lining 5 is laid so as to cover the primary lining 3 and the water blocking layer 8. As the secondary lining 5, precast concrete or the like can be used. The waterstop layer 8 is sealed by pressing the secondary lining 5 in the direction of the wall surface 1a with the anchor 2, the plate 2a and the nut 2b. Thus, the water stop structure 10 shown in FIG. 1 is constructed.

以上、本発明の好適な実施形態について説明したが、本発明は上記実施形態に限定されるものではない。例えば、図５に示すように、壁面１ａと一次覆工３との間に、ゴム製又はビニール製の防水シート１５を介在させてもよい。防水シート１５を使用することによって、壁面１ａからの出水を一層確実に防止できる。また、図５に示すように、壁面１ａと一次覆工３の側面３ａとのコーナー部に出水防止用組成物１８を配置してもよい。この出水防止用組成物１８は、止水構造１０を構築する過程において、止水層８を二次覆工５で封止する作業が終了するまでの間に、止水材料が漏水によって流失するのを防止するためのものである。したがって、一次覆工３を敷設した後、止水層８の形成に先立って、出水防止用組成物１８を所定の位置に設ければよい。出水防止用組成物１８としては、モルタル、粘土、止水ボンドなどを使用できる。   The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, as shown in FIG. 5, a rubber or vinyl waterproof sheet 15 may be interposed between the wall surface 1 a and the primary lining 3. By using the waterproof sheet 15, it is possible to prevent water from the wall surface 1a more reliably. Moreover, as shown in FIG. 5, you may arrange | position the water discharge prevention composition 18 in the corner part of the wall surface 1a and the side surface 3a of the primary lining 3. As shown in FIG. In the process of constructing the water stop structure 10, the water discharge preventing composition 18 causes the water stop material to be washed away by water leakage until the operation of sealing the water stop layer 8 with the secondary lining 5 is completed. This is intended to prevent this. Therefore, after the primary lining 3 is laid, the water discharge preventing composition 18 may be provided at a predetermined position prior to the formation of the water blocking layer 8. As the water discharge preventing composition 18, mortar, clay, water-stopping bond, or the like can be used.

また、上記実施形態においては、二次覆工５をアンカー２で固定する場合を例示したが、坑道１内に構築される土木建築物の構造躯体等をアンカー２で固定し、止水層８と構造躯体等の外面とを当接させて止水層８を封止することによって止水構造を構築してもよい。   Moreover, in the said embodiment, although the case where the secondary lining 5 was fixed with the anchor 2 was illustrated, the structural frame etc. of the civil engineering building constructed in the tunnel 1 are fixed with the anchor 2, and the water stop layer 8 The water stop structure may be constructed by sealing the water stop layer 8 by bringing the water stop layer 8 into contact with the outer surface of the structural housing or the like.

本発明に係る止水構造の実施形態を示す模式断面図である。It is a schematic cross section which shows embodiment of the water stop structure which concerns on this invention. 壁面上に一次覆工を形成した状態を示す模式断面図である。It is a schematic cross section which shows the state which formed the primary lining on the wall surface. 壁面に向けて止水材料を吹付け、止水層の形成を行っている状態を示す模式断面図である。It is a schematic cross section which shows the state which sprays a water stop material toward a wall surface and forms the water stop layer. 止水層の形成が完了した状態を示す模式断面図である。It is a schematic cross section which shows the state which formation of the water stop layer was completed. 本発明に係る止水構造の他の実施形態を示す模式断面図である。It is a schematic cross section which shows other embodiment of the water stop structure which concerns on this invention.

符号の説明Explanation of symbols

１…坑道、１ａ…壁面（施工面）、１ｂ…アンカー設置用削孔、２…アンカー、３…一次覆工（遮水部材）、５…二次覆工（止水層封止部材）、８…止水層、１０…止水構造。 DESCRIPTION OF SYMBOLS 1 ... Tunnel, 1a ... Wall surface (construction surface), 1b ... Drilling hole for anchor installation, 2 ... Anchor, 3 ... Primary lining (water-proof member), 5 ... Secondary lining (water-stop layer sealing member), 8 ... Water stop layer, 10 ... Water stop structure.

Claims (3)

アンカー設置用削孔を有する施工面上に設けられる止水構造であって、
前記アンカー設置用削孔に設置されたアンカーと、
前記アンカー設置用削孔の近傍を覆わないように前記施工面上に設けられた遮水部材と、
前記アンカー設置用削孔の近傍の前記施工面を覆うように形成され、ベントナイトを含有する止水層と、
前記止水層の表面と当接する当接面を有し、前記アンカーによって前記施工面上に固定される止水層封止部材と、
を備えることを特徴とする止水構造。 A water stop structure provided on a construction surface having a hole for anchor installation,
An anchor installed in the anchor installation hole,
A water shielding member provided on the construction surface so as not to cover the vicinity of the anchor installation hole,
Formed so as to cover the construction surface in the vicinity of the anchor installation hole, and a water stop layer containing bentonite,
A water stop layer sealing member having a contact surface that contacts the surface of the water stop layer and fixed on the construction surface by the anchor;
A water-stop structure comprising: アンカー設置用削孔を有する施工面上に止水構造を構築する方法であって、
前記アンカー設置用削孔の近傍を覆わないように前記施工面上に遮水部材を設ける工程と、
前記アンカー設置用削孔にアンカーを設置した後、前記アンカー設置用削孔の近傍の前記施工面を覆うように、ベントナイトを含有する止水層を形成する工程と、
前記止水層の表面と当接する当接面を有する止水層封止部材を前記アンカーによって固定し、前記止水層を封止する工程と、
を備えることを特徴とする、止水構造の構築方法。 A method for constructing a water stop structure on a construction surface having a drill hole for anchor installation,
Providing a water shielding member on the construction surface so as not to cover the vicinity of the anchor installation hole,
A step of forming a water stop layer containing bentonite so as to cover the construction surface in the vicinity of the anchor installation hole after the anchor is installed in the anchor installation hole;
Fixing the water stop layer sealing member having a contact surface that contacts the surface of the water stop layer with the anchor, and sealing the water stop layer;
The construction method of the water stop structure characterized by providing. アンカー設置用削孔を有する施工面上に、請求項１に記載の止水構造を構築することによって遮水部材のアンカー貫通部を止水する方法。   The method of water-stopping the anchor penetration part of a water-blocking member by constructing the water-stop structure of Claim 1 on the construction surface which has a hole for anchor installation.
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