JP2010203117A - Method for collecting groundwater in construction of underground structure by cut-and-cover - Google Patents

Method for collecting groundwater in construction of underground structure by cut-and-cover Download PDF

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JP2010203117A
JP2010203117A JP2009048687A JP2009048687A JP2010203117A JP 2010203117 A JP2010203117 A JP 2010203117A JP 2009048687 A JP2009048687 A JP 2009048687A JP 2009048687 A JP2009048687 A JP 2009048687A JP 2010203117 A JP2010203117 A JP 2010203117A
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water
underground
groundwater
pipe
construction
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JP5236531B2 (en
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Kenichi Kojima
謙一 小島
Koji Goto
幸司 後藤
Hiroaki Sakamoto
寛章 坂本
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Railway Technical Res Inst
財団法人鉄道総合技術研究所
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for collecting groundwater in construction of an underground structure by cut-and-cover, which enables the passage of the water to a recharge side by means of a compact water collecting device having a water collecting pipe arranged in a space in an earth retaining wall installation area. <P>SOLUTION: In this method for collecting the groundwater in the construction of the underground structure by the cut-and-cover, the water collecting pipe 5 reaching a water collection-side aquifer 6 on a water collecting side is arranged in the space within the installation area of the earth retaining wall 4 constructed in the construction of the underground structure; and a water collecting portion of the water collecting pipe 5 is connected to a water passing pipe 7 via the earth retaining wall 4, and brings about a water passing state, so that the groundwater can be conveyed through the water passing pipe 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、開削による地下構造物構築時の地下水集水工法に係り、特に、集水管を土留壁のスペースに配置した地下構造物構築時の地下水集水工法に関するものである。   The present invention relates to a groundwater collection method at the time of construction of an underground structure by excavation, and more particularly to a groundwater collection method at the time of construction of an underground structure in which a water collection pipe is arranged in a space of a retaining wall.
鉄道や道路の函体等の地下構造物を構築する際、掘削のために土留壁を構築することが多い。土留壁構築する深さの範囲に帯水層が存在する場合、構築された土留壁により地下水流動が遮断されてしまう。そのため、構築後の地下水流動を保つために、遮断部を透水層や通水管で接続する必要がある。   When constructing underground structures such as railway and road boxes, retaining walls are often constructed for excavation. When an aquifer exists in the depth range where the retaining wall is constructed, groundwater flow is blocked by the constructed retaining wall. Therefore, in order to maintain the groundwater flow after construction, it is necessary to connect the blocking part with a water permeable layer or a water pipe.
以下、土留壁構築後の地下水流動を保つために、遮断部を通水管で接続する(下記特許文献1参照)場合について説明する。   Hereinafter, in order to maintain the groundwater flow after the construction of the retaining wall, a case where the blocking portion is connected with a water pipe (see Patent Document 1 below) will be described.
図5は従来の地下構造物構築時の地下水集水工法の説明図である。   FIG. 5 is an explanatory diagram of a groundwater collection method at the time of constructing a conventional underground structure.
この図において、101は地表、102は地盤、103は地盤102に構築される地下構造物、104は集水側の柱列式連続土留壁、105は集水側の集水井、106は集水側の帯水層、107は涵養側の柱列式連続土留壁、108は涵養側の涵養井、109は涵養側の帯水層、110は集水側の集水井105と涵養側の涵養井108とを連通する通水管、111は通水管110により流れる地下水である。   In this figure, 101 is the ground surface, 102 is the ground, 103 is an underground structure constructed on the ground 102, 104 is a column-type continuous retaining wall on the catchment side, 105 is a catchment well on the catchment side, and 106 is a catchment A side aquifer, 107 is a column-side continuous retaining wall on the recharge side, 108 is a recharge well on the recharge side, 109 is an aquifer on the recharge side, 110 is a recharge well 105 on the recharge side and a recharge well on the recharge side A water pipe 111 communicating with 108 is groundwater flowing through the water pipe 110.
このように、地盤102に地下構造物103が構築される場合には、地下構造物103の両側に集水側の柱列式連続土留壁104と涵養側の柱列式連続土留壁107が設けられる。すると、流れのある地下水が集水側の帯水層106と涵養側の帯水層109とが遮断されることになる。地下水流動が遮断されてしまうと、集水側の帯水層106では水位が上昇し、涵養側の帯水層109では水位が低下することがある。この地下水の水位の上昇・低下により、建物が傾いたり、地盤沈下が起こるといった問題が生じる。そのため、地下構造物103の構築後の地下水流動を保つ必要がある。ここでは、柱列式連続土留壁104の背面に集水井105を設置して集水し、この集水側の集水井105と涵養側の涵養井108との間に配置された通水管110で地下水を導水し、涵養側の柱列式連続土留壁107の背面に設置された涵養側の涵養井108に涵養する。   Thus, when the underground structure 103 is constructed on the ground 102, the water column-side continuous retaining wall 104 and the recharge-side columnar continuous retaining wall 107 are provided on both sides of the underground structure 103. It is done. Then, the aquifer 106 on the catchment side and the aquifer 109 on the recharge side are blocked by the flowing groundwater. If the groundwater flow is interrupted, the water level may rise in the aquifer 106 on the catchment side, and the water level may fall in the aquifer 109 on the recharge side. Due to the rise and fall of the groundwater level, problems such as tilting of the building and subsidence occur. Therefore, it is necessary to maintain the groundwater flow after the construction of the underground structure 103. Here, a water collection well 105 is installed on the back of the columnar continuous retaining wall 104 to collect water, and a water pipe 110 is disposed between the water collection well 105 on the water collection side and the recharge well 108 on the recharge side. Groundwater is introduced and recharged to a recharge well 108 on the recharge side installed on the back side of the column-side continuous retaining wall 107 on the recharge side.
なしNone
しかしながら、上記した従来の地下構造物構築時の地下水集水工法では、土留壁104,107の背面に集水井105,108を設置しければならない。これは、地下構造物103の構築範囲の外部であるため、用地上の問題がある。   However, in the above-described conventional groundwater collection method when constructing an underground structure, the drainage wells 105 and 108 must be installed on the back of the retaining walls 104 and 107. Since this is outside the construction range of the underground structure 103, there is a problem on the ground.
本発明は、上記状況に鑑みて、集水管を土留壁設置範囲内の空間に配置するコンパクトな集水装置により、涵養側への通水を行うことができる開削による地下構造物構築時の地下水集水工法を提供することを目的とする。   In view of the above situation, the present invention provides a groundwater at the time of construction of an underground structure by excavation that can conduct water to the recharge side by a compact water collecting device that arranges a water collecting pipe in a space within the retaining wall installation range. The purpose is to provide a water collection method.
本発明は、上記目的を達成するために、
〔1〕開削による地下構造物構築時の地下水集水工法において、地下構造物構築時に構築される土留壁が形成される空間に帯水層に達する集水管を配置し、この集水管の集水部を前記土留壁を介して通水管に接続して通水状態とし、前記通水管により地下水を導水するようにしたことを特徴とする。
In order to achieve the above object, the present invention provides
[1] In the underground water collection method when constructing an underground structure by excavation, a water collection pipe reaching the aquifer is placed in the space where the retaining wall constructed during the construction of the underground structure is formed. The section is connected to a water pipe through the retaining wall so as to be in a water passage state, and ground water is introduced through the water pipe.
〔2〕上記〔1〕記載の開削による地下構造物構築時の地下水集水工法において、前記集水管を少なくとも集水側の土留壁の一部に配設することを特徴とする。   [2] In the groundwater collecting method when constructing an underground structure by excavation according to [1] above, the water collecting pipe is disposed at least on a part of the retaining wall on the water collecting side.
〔3〕上記〔1〕記載の開削による地下構造物構築時の地下水集水工法において、前記集水管を集水側及び涵養側の土留壁の一部に配設することを特徴とする。   [3] In the groundwater collecting method when constructing an underground structure by excavation as described in [1] above, the water collecting pipe is disposed on a part of the retaining wall on the water collecting side and the recharge side.
本発明によれば、開削による地下構造物構築時の地下水集水工法において、集水装置としての集水管を土留壁設置範囲内の空間に配置する簡易な構造により地下水の通水を行うことができる。そのため、地下水流動保全のための工期を短縮することができる。また、コンパクトな集水装置となるため、用地上の問題がなくなり、工費を低減することができる。   According to the present invention, in the groundwater collection method at the time of construction of an underground structure by excavation, groundwater can be passed by a simple structure in which a water collection pipe as a water collection device is arranged in a space within a retaining wall installation range. it can. Therefore, the construction period for groundwater flow maintenance can be shortened. Moreover, since it becomes a compact water collecting apparatus, the problem on the ground is eliminated and the construction cost can be reduced.
本発明の実施例を示す開削による地下構造物構築時の地下水集水工法の施工概要図である。It is a construction outline figure of the groundwater catchment method at the time of underground structure construction by excavation which shows the example of the present invention. 本発明の地下水集水工法に用いられる土留壁の掘削背面側を示す図である。It is a figure which shows the excavation back side of the earth retaining wall used for the groundwater collection method of this invention. 本発明の地下水集水工法に用いられる土留壁と通水管を示す斜視図である。It is a perspective view which shows the earth retaining wall and water flow pipe used for the groundwater catchment construction method of this invention. 本発明の地下水集水工法に用いられる集水管の断面図である。It is sectional drawing of the water collection pipe | tube used for the groundwater collection method of this invention. 従来の地下構造物構築時の地下水集水工法の説明図である。It is explanatory drawing of the groundwater collection method at the time of the conventional underground structure construction.
本発明の開削による地下構造物構築時の地下水集水工法は、地下構造物構築時に構築される土留壁設置範囲内の空間に帯水層に達する集水管を配置し、この集水管の集水部を前記土留壁を介して通水管に接続して通水状態とし、前記通水管により地下水を導水するようにした。   According to the excavation method of the present invention, the groundwater collection method for constructing an underground structure is to arrange a collection pipe that reaches the aquifer in a space within the earth wall installation range constructed at the time of construction of the underground structure. The section was connected to a water pipe through the retaining wall to make it water-permeable, and groundwater was introduced through the water pipe.
以下、本発明の実施の形態について詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.
図1は本発明の実施例を示す開削による地下構造物構築時の地下水集水工法の施工概要図、図2は本発明の地下水集水工法に用いられる掘削背面側を示す土留壁の図、図3はその土留壁と通水管を示す斜視図、図4はその集水管の断面図である。   FIG. 1 is a schematic diagram of construction of a groundwater catchment method when constructing an underground structure by excavation according to an embodiment of the present invention, FIG. 2 is a diagram of a retaining wall showing a back side of excavation used in the groundwater catchment method of the present invention, FIG. 3 is a perspective view showing the earth retaining wall and the water pipe, and FIG. 4 is a sectional view of the water collecting pipe.
これらの図において、1は地表、2は地盤、3は地下構造物、4は集水側の土留壁(H鋼、鋼矢板、鋼管)、5はその集水側の土留壁4背面に設けられた集水管、6は集水側の帯水層、7は集水管5と接続され、地下水を涵養側に通水するために掘削側に配置される通水管、8は集水側の地盤、9は掘削側の地盤側を示している。なお、集水管5の集水部5Aと通水管7の間の部分の土留壁4には、図示していないが、穴や溝などを形成して導水できるように構成している。   In these drawings, 1 is the ground surface, 2 is the ground, 3 is an underground structure, 4 is a catchment wall (H steel, steel sheet pile, steel pipe), 5 is provided on the back of the catchment wall 4 on the catchment side The collected water collecting pipe, 6 is the aquifer on the water collecting side, 7 is connected to the water collecting pipe 5 and is arranged on the excavation side to pass groundwater to the recharge side, and 8 is the ground on the water collecting side. , 9 indicates the ground side on the excavation side. In addition, although not shown in figure in the earth retaining wall 4 of the part between the water collection part 5A of the water collection pipe 5 and the water flow pipe 7, it is comprised so that water may be guided by forming a hole, a groove | channel, etc.
本発明では、図2及び図4に示すように、集水側の土留壁4の背面に集水機能を持つ集水管5を設けることにより集水する。   In this invention, as shown in FIG.2 and FIG.4, it collects water by providing the water collection pipe | tube 5 which has a water collection function in the back surface of the earth retaining wall 4 of the water collection side.
この集水管5は、図1に示すように、帯水層6と接する位置まで設けるようにする。   As shown in FIG. 1, the water collecting pipe 5 is provided up to a position in contact with the aquifer 6.
集水管5で集めた水は、図3に示すように、集水部5Aに土留壁4を挟んで配置される掘削側の通水管7へ通水される。なお、集水管5で集めた水は、通水管7を通して涵養側で帯水層に戻すなどして処理する。   As shown in FIG. 3, the water collected by the water collecting pipe 5 is passed through the water collecting pipe 5 on the excavation side, which is disposed in the water collecting portion 5 </ b> A with the earth retaining wall 4 interposed therebetween. The water collected by the water collecting pipe 5 is treated by returning it to the aquifer on the recharge side through the water pipe 7.
また、集水装置としての集水管は、土留壁の設置後に短期間で施工できる。つまり、工期の短縮を図ることができ、より簡便に地下水流動保全を行うことができる。   Moreover, the water collecting pipe as the water collecting device can be constructed in a short period of time after the retaining wall is installed. That is, the construction period can be shortened and groundwater flow maintenance can be performed more easily.
本発明の地下水集水工法における集水管は、図1及び図4に示すように、土留壁の設置範囲内の空間(土留壁4の凹凸部分)に配置することができ、コンパクトな集水システムを構築することができる。そのため、従来の集水井を設置する場合のように用地上の問題もなくなり、工費を低減することができる。   As shown in FIGS. 1 and 4, the water collection pipe in the groundwater collection method of the present invention can be disposed in a space within the installation range of the retaining wall (uneven portion of the retaining wall 4), and is a compact water collecting system. Can be built. Therefore, there is no problem on the ground as in the case of installing a conventional water well, and the construction cost can be reduced.
なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づき種々の変形が可能であり、これらを本発明の範囲から排除するものではない。   In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.
本発明の開削による地下構造物構築時の地下水集水工法は、工費を低減し、工期を短縮して地下水流動保全を行うことができる地下水集水工法として利用することができる。   The groundwater collection method at the time of construction of an underground structure by excavation of the present invention can be used as a groundwater collection method that can reduce the construction cost, shorten the construction period, and maintain the groundwater flow.
1 地表
2 地盤
3 地下構造物
4 集水側の土留壁
5 集水管
5A 集水部
6 集水側の帯水層
7 通水管
8 集水側の地盤
9 掘削側の地盤
DESCRIPTION OF SYMBOLS 1 Ground surface 2 Ground 3 Underground structure 4 Catchment wall earth retaining wall 5 Catchment pipe 5A Catchment part 6 Catchment side aquifer 7 Water flow pipe 8 Catchment side ground 9 Excavation side ground

Claims (3)

  1. 地下構造物構築時に構築される土留壁設置範囲内の空間に帯水層に達する集水管を配置し、該集水管の集水部を前記土留壁を介して通水管に接続して通水状態とし、前記通水管により地下水を導水するようにしたことを特徴とする開削による地下構造物構築時の地下水集水工法。   A water collecting pipe that reaches the aquifer is arranged in a space within the retaining wall installation range that is constructed when the underground structure is constructed, and the water collecting state is connected to the water collecting pipe through the retaining wall. A groundwater collection method for constructing an underground structure by excavation, characterized in that groundwater is introduced by the water pipe.
  2. 請求項1記載の開削による地下構造物構築時の地下水集水工法において、前記集水管を少なくとも集水側の土留壁の一部に配設することを特徴とする開削による地下構造物構築時の地下水集水工法。   The groundwater collection method for constructing an underground structure by excavation according to claim 1, wherein the drainage pipe is disposed at least in part of a retaining wall on the catchment side. Groundwater collection method.
  3. 請求項1記載の開削による地下構造物構築時の地下水集水工法において、前記集水管を集水側及び涵養側の土留壁の一部に配設することを特徴とする開削による地下構造物構築時の地下水集水工法。   The underground water construction method for constructing an underground structure by excavation according to claim 1, wherein the drainage pipe is disposed on a part of the retaining wall on the collection side and the recharge side. Time groundwater collection method.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000087384A (en) * 1998-09-09 2000-03-28 Shimizu Corp Underground water continuity mechanism of soil cement column row wall and its execution
JP2002138464A (en) * 2000-11-02 2002-05-14 Ohbayashi Corp Permeable diaphragm wall and its construction method
JP2005330769A (en) * 2004-05-21 2005-12-02 Tokyu Construction Co Ltd Structure and construction method of water passing earth retaining wall
JP2006161514A (en) * 2004-12-10 2006-06-22 Konoike Constr Ltd Construction method of securing water permeability of water-bearing layer
JP2006336401A (en) * 2005-06-06 2006-12-14 Takenaka Komuten Co Ltd Permeable earth retaining wall
JP2007100416A (en) * 2005-10-05 2007-04-19 Tokyu Construction Co Ltd Structure and construction method for steel sheet pile and water passing soil retaining wall

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000087384A (en) * 1998-09-09 2000-03-28 Shimizu Corp Underground water continuity mechanism of soil cement column row wall and its execution
JP2002138464A (en) * 2000-11-02 2002-05-14 Ohbayashi Corp Permeable diaphragm wall and its construction method
JP2005330769A (en) * 2004-05-21 2005-12-02 Tokyu Construction Co Ltd Structure and construction method of water passing earth retaining wall
JP2006161514A (en) * 2004-12-10 2006-06-22 Konoike Constr Ltd Construction method of securing water permeability of water-bearing layer
JP2006336401A (en) * 2005-06-06 2006-12-14 Takenaka Komuten Co Ltd Permeable earth retaining wall
JP2007100416A (en) * 2005-10-05 2007-04-19 Tokyu Construction Co Ltd Structure and construction method for steel sheet pile and water passing soil retaining wall

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