JP2010203102A - Core material of underground wall and structure of underground wall - Google Patents

Core material of underground wall and structure of underground wall Download PDF

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JP2010203102A
JP2010203102A JP2009048244A JP2009048244A JP2010203102A JP 2010203102 A JP2010203102 A JP 2010203102A JP 2009048244 A JP2009048244 A JP 2009048244A JP 2009048244 A JP2009048244 A JP 2009048244A JP 2010203102 A JP2010203102 A JP 2010203102A
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underground wall
core material
mixture
steel
spacer
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JP4828614B2 (en
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Hiroyuki Okuyama
裕之 奥山
Shinji Yonemoto
真治 米元
Toitsu Kojima
統一 児島
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MO TEC KK
Shimizu Construction Co Ltd
Shimizu Corp
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MO TEC KK
Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a core material of an underground wall enabling a mixture formed by stirring and mixing a solidifying fluid penetrated to the surface of the flange of the core and a soil at the present position to be easily removed in a short time, and a structure of an underground wall. <P>SOLUTION: This core material is used for an underground wall comprising a core and a mixture formed by stirring and mixing a solidifying fluid and a soil at the present position. The core material is constituted by projecting a spacer from one surface of a steel. The total of the dimension of the steel in the thickness direction and the projecting dimension of the spacer is generally equal to the thickness of the underground wall. The underground wall is constructed using the core material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、地下壁の構造と芯材に関するものである。   The present invention relates to a structure of a underground wall and a core material.

ビルの地下や基礎の開削に先立って、非開削部の崩壊を阻止するために地下壁を構築する方法が一般に採用されている。
この地下壁には、多くの種類の工法があるが、たとえば地盤を溝状に固化液と原位置土を攪拌、混合し、その混合体の内部にＨ形鋼などの芯材を挿入し、硬化後に壁状の地下壁を構成するタイプの地下壁の構築方法が利用されている。
地下壁が完成後に地盤を開削する場合には、この地下壁の片側に沿って地盤を掘削するが、芯材の開削側にも固化液と原位置土を攪拌、混合した混合体が回り込んでいるから、芯材のフランジ面の上の混合体を剥離させながら芯材をハツリ出してゆくという作業が必要である。 Prior to excavation of the basement and foundation of a building, a method of constructing an underground wall is generally employed to prevent the collapse of non-excavated parts.
There are many types of construction methods for this underground wall. For example, the ground is grooved and the solidified liquid and in situ soil are stirred and mixed, and a core material such as H-shaped steel is inserted into the mixture, A method of constructing a type of underground wall that forms a wall-shaped underground wall after curing is used.
When excavating the ground after the underground wall is completed, the ground is excavated along one side of the underground wall, but a mixture of the solidified liquid and in-situ agitated and mixed around the excavation side of the core. Therefore, it is necessary to work to rip out the core material while peeling the mixture on the flange surface of the core material.

特開平８−１２８０３７号公報JP-A-8-128037

前記したような従来の地下壁の構造と芯材にあっては、次のような問題点がある。
＜１＞ 芯材の開削側に固化液と原位置土を攪拌、混合した混合体が充填されているので、この混合体を破壊しながら芯材をハツリ出してゆく必要があるが、その作業は芯材のＨ形鋼や地山壁面に大きな衝撃を与えない程度の適度の力を与える必要があり、熟練や手数を要する。
＜２＞ 芯材の表面に位置する混合体は、ハツリ作業によって混合体の破壊片となり、大量の廃棄物が発生する。
＜３＞ 芯材の表面の、固化液と原位置土を攪拌、混合した混合体をハツリ作業で除去した後に残った部分が有効な地下壁となるので、除去する混合体の厚さが厚いと、地中に残る地下壁の厚さが薄いものとなってしまう。
The conventional underground wall structure and core as described above have the following problems.
<1> Since the mixture obtained by stirring and mixing the solidified liquid and the in-situ soil is filled on the cut-off side of the core material, it is necessary to remove the core material while breaking the mixture. However, it is necessary to apply an appropriate force that does not give a large impact to the core H-shaped steel or the ground wall, which requires skill and labor.
<2> The mixture located on the surface of the core material becomes a broken piece of the mixture by the chipping operation, and a large amount of waste is generated.
<3> Since the remaining part of the surface of the core material after stirring and mixing the solidified liquid and the in situ soil is removed by the chiseling work becomes an effective underground wall, the thickness of the mixture to be removed is thick And the thickness of the underground wall that remains in the ground will be thin.

上記のような課題を解決するために、本発明の芯材は、芯材と、固化液と原位置土を攪拌、混合した混合体よりなる地下壁に用いる芯材であって、芯材は、鋼材の一側の面にスペーサーを突出して構成し、鋼材の厚さ方向の寸法とスペーサーの突出寸法との合計が、ほぼ地下壁の厚さに相当するように構成したことを特徴としたものである。
また、本発明の地下壁の構造は、芯材と、固化液と原位置土を攪拌、混合した混合体よりなる地下壁において、前記の鋼材にスペーサーを取り付けた芯材を使用し、鋼材は、地下壁の一側に接し、スペーサーは、地下壁の他の側に接するように配置して構成したことを特徴としたものである。
In order to solve the above problems, the core material of the present invention is a core material used for an underground wall made of a mixture obtained by stirring and mixing a core material, a solidified liquid, and an in-situ soil. The structure is such that a spacer is projected on one side of the steel material, and the sum of the dimension in the thickness direction of the steel material and the projected dimension of the spacer is substantially equivalent to the thickness of the underground wall. Is.
In addition, the structure of the underground wall of the present invention uses a core material, a core material in which a spacer is attached to the steel material, in the underground wall made of a mixture obtained by stirring and mixing the solidified liquid and the in-situ soil. The spacer is arranged so as to be in contact with one side of the underground wall and the spacer is arranged to be in contact with the other side of the underground wall.

本発明の地下壁の構造と芯材は以上説明したようになるから次のような効果を得ることができる。
＜１＞ 芯材が地下壁の開削側に寄っているので、開削側に芯材のフランジ表面に位置する混合体は薄いから、その混合体のハツリが簡単で短時間である。
＜２＞ 同じ厚さの溝状の混合体で地下壁を作った場合に、従来のように芯材を地下壁の中心に配置した場合よりも、本願発明の構造によれば厚さの厚い地下壁が得られる。
＜３＞ その理由を図４に示すと、開削時に芯材の開削側の表面までの混合体はハツリ取る必要があるが、芯材が従来のように地下壁の中心にあればハツリ厚は大きく、開削側に偏っていればハツリ厚は小さくてすみ、その結果、ハツリ後の壁厚が変わってくるからである。
＜４＞ ハツリ後に地中に残った地下壁の壁厚が厚くなれば、強度、止水性が向上する。
＜５＞ 開削時の混合体のハツリ量が少なくなるので、発生する廃棄物の量も減少する。
Since the underground wall structure and core material of the present invention are as described above, the following effects can be obtained.
<1> Since the core material is close to the excavation side of the underground wall, the mixture located on the flange surface of the core material is thin on the excavation side, so that the mixture is easy to crush and is short.
<2> When the underground wall is made of a groove-like mixture having the same thickness, the thickness of the core is thicker than in the conventional case where the core material is arranged at the center of the underground wall. An underground wall is obtained.
<3> If the reason is shown in FIG. 4, it is necessary to remove the mixture up to the surface on the side of the core material when cutting, but if the core material is at the center of the underground wall as in the conventional case, This is because, if it is large and biased toward the cut-off side, the chip thickness is small, and as a result, the wall thickness after chipping changes.
<4> If the wall thickness of the underground wall remaining in the ground after crushing is increased, the strength and water stoppage are improved.
<5> Since the amount of chipping of the mixture during cutting is reduced, the amount of waste generated is also reduced.

本発明の地下壁の構造と芯材の実施例の説明図。Explanatory drawing of the structure of the underground wall of this invention, and the Example of a core material. 地下壁を構築する順序の説明図。Explanatory drawing of the order which builds an underground wall. 地下壁を構築する順序の説明図。Explanatory drawing of the order which builds an underground wall. 地下壁を構築する順序の説明図。Explanatory drawing of the order which builds an underground wall. 開削後の地下壁の状態の説明図。Explanatory drawing of the state of the underground wall after excavation. フランジの表面の混合体を除去した後の壁厚を、従来の工法と比較した図。The figure which compared the wall thickness after removing the mixture of the surface of a flange with the conventional construction method.

以下図面を参照にしながら本発明の好適な実施の形態を詳細に説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

＜１＞前提条件。
地下壁の構造にも多くの種類があるが、本願発明の対象は、地盤に一定の長さと厚さの固化液と原位置土を攪拌、混合した混合体２を形成し、硬化する前の混合体２の内部に鋼製の芯材１を挿入して構成した地下壁の構造、およびそのような構成の地下壁に用いる芯材１が、本発明の対象である。
このような固化液と原位置土を攪拌、混合した混合体２よりなる地下壁の構築方法には各種の工法が開発されている。
その場合に混合体２の形状、すなわち地下壁の形状は、矩形の場合も、円柱を順次接続した形状の場合もあり、いずれの形状の場合も本発明の方法を採用することができる。
なお、地下壁は一般的に平面的に、幅に対して長さの長い矩形を呈するから、本明細書で「長さ」とは矩形の長い辺を意味し、「厚さ」とは矩形の短い辺を意味するものとする。 <1> Precondition.
Although there are many types of underground wall structures, the object of the present invention is to form a mixture 2 in which the solidified liquid of a certain length and thickness and the in-situ soil are mixed and agitated on the ground before being hardened. The structure of the underground wall constituted by inserting the steel core material 1 into the interior of the mixture 2 and the core material 1 used for the underground wall having such a structure are the subject of the present invention.
Various construction methods have been developed for the construction method of the underground wall made of the mixture 2 obtained by stirring and mixing the solidified liquid and the in situ soil.
In this case, the shape of the mixture 2, that is, the shape of the underground wall may be a rectangular shape or a shape in which cylinders are sequentially connected. In any case, the method of the present invention can be employed.
In addition, since the underground wall generally has a rectangular shape with a long length with respect to the width, in this specification, “length” means a long side of the rectangle, and “thickness” means a rectangular shape. Means the short side of.

＜２＞芯材。
まだ硬化していない固化液と原位置土の混合体２の内部に挿入する芯材１は、鋼材１１と、その鋼材１１の一側に突設したスペーサー１２とによって構成する。 <2> Core material.
The core material 1 to be inserted into the mixture 2 of solidified liquid and in-situ soil that has not yet been hardened is constituted by a steel material 11 and a spacer 12 protruding on one side of the steel material 11.

＜２−１＞鋼材。
芯材１を構成する鋼材１１は、鋼製のＨ形鋼を採用する。
鋼材１１は、並行する２枚のフランジ１１ｂの間をウェブ１１ａで接続して構成した長尺の部材である。
これらの鋼材１１は、そのフランジ１１ｂを混合体２の長さ方向と平行する方向に向けて混合体２内に挿入して、地下壁を構築する。
なお、鋼材１１のフランジ１１ｂの下端を内側へ折り曲げて傾斜面を形成しておくと、混合体２内への挿入がスムーズになる。
この傾斜面は、両側のフランジ１１ｂの下端に設けることもできるが、場合によっては後述するスペーサー１２を突設していない面のフランジ１１ｂの下端だけに設けることもできる。
なお芯材としては、Ｈ形鋼以外に、Ｉ形鋼、溝形鋼、山形鋼、軌条などを採用することもでき、それらにおいて、フランジ、ウェブに相当する部分を同様に解釈する。 <2-1> Steel material.
The steel material 11 which comprises the core material 1 employs steel H-section steel.
The steel material 11 is a long member configured by connecting two parallel flanges 11b with a web 11a.
These steel materials 11 are inserted into the mixture 2 with their flanges 11b oriented in a direction parallel to the length direction of the mixture 2 to construct an underground wall.
In addition, when the lower end of the flange 11b of the steel material 11 is bent inward to form an inclined surface, the insertion into the mixture 2 becomes smooth.
This inclined surface can be provided at the lower ends of the flanges 11b on both sides. However, in some cases, the inclined surface can be provided only at the lower ends of the flanges 11b on the surface where the spacers 12 described later are not provided.
As the core material, in addition to the H-shaped steel, I-shaped steel, groove-shaped steel, angle steel, rails, and the like can also be adopted, and the portions corresponding to the flange and the web are interpreted in the same manner.

＜２−２＞スペーサー。
スペーサー１２は、鋼材１１の一側のフランジ１１ｂの表面から突出させた鋼製の部材である。
このスペーサー１２は、たとえば斜面を備えた山型の鋼板を、鋼材１１のフランジ１１ｂに溶接して構成することができる。
あるいは曲面を備えた鋼板を、鋼材１１のフランジ１１ｂに溶接して構成することもできる。
この場合に、スペーサー１２の斜面や曲面は、鋼材１１の長手方向に沿って配置する。
このように配置すると、芯材１を混合体２内に挿入する場合に、スペーサー１２が混合体２と地山との境界面に滑らかに接して地山の表面を削り取る可能性が低く、芯材１のスムーズな混合体２内への設置ができる。
このスペーサー１２は、鋼材１１の一側だけから突出しているから、芯材１を混合体２内に挿入した場合に、芯材１を偏った位置に設置することができる。
スペーサー１２は、図１のように鋼材１１の表面に平行に２列に配置する構成、図６のように一列に配置する構成、あるいは複数列に配置する構成を採用できる。 <2-2> Spacer.
The spacer 12 is a steel member that protrudes from the surface of the flange 11 b on one side of the steel material 11.
The spacer 12 can be formed by welding, for example, a mountain-shaped steel plate having a slope to the flange 11 b of the steel material 11.
Or the steel plate provided with the curved surface can also be comprised by welding to the flange 11b of the steel material 11. FIG.
In this case, the slopes and curved surfaces of the spacers 12 are arranged along the longitudinal direction of the steel material 11.
With this arrangement, when the core material 1 is inserted into the mixture 2, it is unlikely that the spacer 12 smoothly touches the boundary surface between the mixture 2 and the natural ground and scrapes the ground surface. The material 1 can be installed in the smooth mixture 2.
Since this spacer 12 protrudes from only one side of the steel material 11, when the core material 1 is inserted into the mixture 2, the core material 1 can be installed at a biased position.
The spacer 12 can employ a configuration in which the spacers 12 are arranged in two rows parallel to the surface of the steel material 11 as shown in FIG. 1, a configuration in which the spacers 12 are arranged in one row as shown in FIG.

＜２−３＞芯材の平面寸法。
芯材１は、まだ硬化しない混合体２内へ挿入するものであるから、当然地下壁の厚さ方向における鋼材１１の寸法は、混合体２の厚さよりも薄いものである。
しかし本願発明の芯材１は従来の鋼材１１だけのものと相違して、鋼材１１の一側のフランジ１１ｂからスペーサー１２を突設している。
その結果、芯材１が混合体２の内部に挿入できない寸法では芯材１としての機能が達成できず、一方、芯材１が混合体２の内部で厚さ方向に自由に移動が可能であっても本願発明の効果を達成しない。
そこで本願発明の芯材１では、鋼材１１のフランジ１１ｂからフランジ１１ｂまでの寸法と、スペーサー１２の突出寸法との合計が、ほぼ混合体２の厚さ、すなわち地下壁の厚さに相当するように構成してある。
そのような寸法を確保した結果、芯材１は混合体２内へ挿入することが可能であり、かつ挿入した鋼材１１は混合体２の一側へ偏った状態で設置されることになる。
なお地下壁を、円柱を並べた柱列タイプとして構築する場合でも、芯材１が混合体２の内部で自由に移動できないことが要求される。したがってその場合の地下壁の「厚さ」とは、図１に示すように、掘削した円柱の直径に近い寸法となる。 <2-3> Plane dimensions of core material.
Since the core material 1 is inserted into the mixture 2 that has not yet hardened, the dimension of the steel material 11 in the thickness direction of the underground wall is naturally smaller than the thickness of the mixture 2.
However, unlike the conventional steel material 11, the core material 1 of the present invention has a spacer 12 protruding from a flange 11b on one side of the steel material 11.
As a result, if the core material 1 cannot be inserted into the mixture 2, the function as the core material 1 cannot be achieved, while the core material 1 can move freely in the thickness direction inside the mixture 2. Even if it exists, the effect of this invention is not achieved.
Therefore, in the core material 1 of the present invention, the total of the dimension from the flange 11b to the flange 11b of the steel material 11 and the protruding dimension of the spacer 12 substantially corresponds to the thickness of the mixture 2, that is, the thickness of the underground wall. It is configured.
As a result of ensuring such dimensions, the core material 1 can be inserted into the mixture 2, and the inserted steel material 11 is installed in a state of being biased to one side of the mixture 2.
Even when the underground wall is constructed as a columnar type in which cylinders are arranged, it is required that the core material 1 cannot freely move inside the mixture 2. Therefore, the “thickness” of the underground wall in that case is a dimension close to the diameter of the excavated cylinder, as shown in FIG.

＜３＞地下壁の構築。
上記の芯材１を用いた地下壁の構築方法について説明する。
従来からの公知の装置を使用して地盤に一定の長さと厚さを備えた溝状に、固化液と原位置土を攪拌、混合した混合体２を形成する。
この混合体２の内部に前記した芯材１を、一定間隔を介して鉛直に挿入する。
地下壁を構築した後、地下室や地下道路などの構築のために、地下壁の一側の地盤を開削する。 <3> Construction of the underground wall.
The construction method of the underground wall using said core material 1 is demonstrated.
Using a known device, a mixture 2 is formed by stirring and mixing the solidified liquid and the in-situ soil in a groove shape having a certain length and thickness on the ground.
The core material 1 described above is inserted vertically into the mixture 2 at regular intervals.
After building the basement wall, the ground on one side of the basement wall is excavated in order to construct a basement or an underground road.

＜４＞芯材の配置。
前記したように、芯材１は鋼材１１と、その鋼材１１の一側のフランジ１１ｂから突設したスペーサー１２から構成してある。
この芯材１を、固化液と原位置土を攪拌、混合した、まだ硬化していない混合体２内に吊下ろす。
その場合に、スペーサー１２側を開削面とは反対側に位置するように吊下ろす。
そのために、鋼材１１の一側のフランジ１１ｂは、混合体２と地山との境界面の一側に接し、スペーサー１２は、混合体２の他の側面に接するように配置されることになる。
このような芯材１の形状によって、鋼材１１の一側のフランジ１１ｂは、混合体２と地山の境界面に接するように挿入されるから、フランジ１１ｂと混合体２壁との間に位置する混合体２の量、すなわちフランジ１１ｂ表面の固化体２１の厚さはきわめて薄いものとなる。 <4> Arrangement of the core material.
As described above, the core material 1 includes the steel material 11 and the spacer 12 protruding from the flange 11b on one side of the steel material 11.
The core material 1 is suspended in a mixture 2 that is not yet cured, in which the solidified liquid and the in situ soil are stirred and mixed.
In that case, the spacer 12 is suspended so as to be located on the side opposite to the cut surface.
Therefore, the flange 11b on one side of the steel material 11 is in contact with one side of the boundary surface between the mixture 2 and the natural ground, and the spacer 12 is disposed in contact with the other side surface of the mixture 2. .
With such a shape of the core material 1, the flange 11 b on one side of the steel material 11 is inserted so as to be in contact with the boundary surface between the mixture 2 and the natural ground, so that it is positioned between the flange 11 b and the wall of the mixture 2. The amount of the mixture 2 to be processed, that is, the thickness of the solidified body 21 on the surface of the flange 11b is extremely thin.

＜５＞ハツリ作業。
混合体２が硬化すると地下壁が完成する。
その地下壁の一側を開削すると、図５に示すように地下壁の一側が露出してくる。
その場合に、鋼材１１の一側のフランジ１１ｂが混合体２と地山との境界面に接していたから、フランジ１１ｂと地山との境界面との間に位置する固化体２１の量はわずかであり、薄い固化体２１が硬化して付着している程度である。
開削した場合に、その硬化後の薄い固化体２１が開削面に露出してくるので、その固化体２１をハツル作業は簡単であり、熟練を要せずに短時間で行うことができる。
さらにフランジ１１ｂ表面の硬化後の薄い固化体２１を除去した後に残る地下壁の厚さは、図４に示すように、芯材１を地下壁の中心に配置した従来の構造と比較して十分に厚い地下壁を確保できるから、大きい強度を期待できることはもちろん、地下水の滲出を阻止する機能も高いものとなる。
<5> Chiseling work.
When the mixture 2 is cured, the underground wall is completed.
When one side of the underground wall is cut, one side of the underground wall is exposed as shown in FIG.
In this case, since the flange 11b on one side of the steel material 11 is in contact with the boundary surface between the mixture 2 and the natural ground, the amount of the solidified body 21 located between the flange 11b and the natural ground is small. Yes, the thin solidified body 21 is hardened and adhered.
When the cut is performed, the thin solidified body 21 after the curing is exposed on the cut surface, and thus the solidified body 21 is easy to shave and can be performed in a short time without requiring skill.
Further, the thickness of the underground wall remaining after removing the thin solidified body 21 after the hardening of the flange 11b surface is sufficient as compared with the conventional structure in which the core material 1 is arranged at the center of the underground wall, as shown in FIG. A thick underground wall can be secured, so that not only high strength can be expected, but also the function of preventing the seepage of groundwater is high.

１：芯材
１１：鋼材
１１ａ：ウェブ
１１ｂ：フランジ
１２：スペーサー
２：混合体
２１：固化体 1: Core material 11: Steel material 11a: Web 11b: Flange 12: Spacer 2: Mixture 21: Solidified body

Claims (3)

芯材と、固化液と原位置土を攪拌、混合した混合体よりなる地下壁に用いる芯材であって、
芯材は、鋼材の一側の面にスペーサーを突出して構成し、
鋼材の、前記地下壁の厚さ方向における鋼材の寸法とスペーサーの突出寸法との合計が、
ほぼ地下壁の厚さに相当するように構成した、
地下壁の芯材。
A core material used for an underground wall made of a mixture obtained by stirring and mixing a core material, a solidified liquid and an in-situ soil,
The core material is constructed by protruding a spacer on one side of the steel material,
The sum of the dimension of the steel material in the thickness direction of the underground wall and the protruding dimension of the spacer of the steel material,
Constructed to roughly correspond to the thickness of the underground wall,
Core material for underground walls.
鋼材の先端には、
内側へ傾斜した斜面板を形成した、
請求項１記載の地下壁の芯材。
At the tip of the steel material,
Formed a sloped plate inclined inward,
The core material of the underground wall of Claim 1.
芯材と、固化液と原位置土を攪拌、混合した混合体よりなる地下壁であって、
芯材は、鋼材の一側の面にスペーサーを突出して構成し、
鋼材の前記地下壁の厚さ方向における鋼材の寸法と、スペーサーの突出寸法との合計が、ほぼ地下壁の厚さに相当するように構成した芯材であり、
前記芯材の鋼材が、地下壁の一側に接し、
前記芯材のスペーサーが、地下壁の他の側面に接するように配置して構成した、
地下壁の構造。 It is an underground wall made of a mixture obtained by stirring and mixing the core material, the solidified liquid and the in situ soil,
The core material is constructed by protruding a spacer on one side of the steel material,
The core material is configured such that the sum of the dimension of the steel material in the thickness direction of the underground wall of the steel and the protruding dimension of the spacer substantially corresponds to the thickness of the underground wall,
The steel material of the core material is in contact with one side of the underground wall,
The spacer of the core material is configured to be in contact with the other side surface of the underground wall,
The structure of the underground wall.
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CN110777929A (en) * 2019-11-12 2020-02-11 南京武动机电设备科技有限公司 Underground outer wall anti-seepage device and application method thereof
JP2021011695A (en) * 2019-07-04 2021-02-04 鹿島建設株式会社 Core material for mountain retaining wall and its installation method

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JPH0559720A (en) * 1991-09-03 1993-03-09 Kazuo Hamaya Sheathing construction
JPH08128037A (en) * 1994-10-31 1996-05-21 Maeda Corp Basement wall construction method and cutting device in smw construction method
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JPS4811607B1 (en) * 1969-09-30 1973-04-14
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JPH0559720A (en) * 1991-09-03 1993-03-09 Kazuo Hamaya Sheathing construction
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JP2021011695A (en) * 2019-07-04 2021-02-04 鹿島建設株式会社 Core material for mountain retaining wall and its installation method
JP7240274B2 (en) 2019-07-04 2023-03-15 鹿島建設株式会社 Core material for earth retaining wall and installation method thereof
CN110777929A (en) * 2019-11-12 2020-02-11 南京武动机电设备科技有限公司 Underground outer wall anti-seepage device and application method thereof

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