JP2005090015A - Ground excavating method - Google Patents

Ground excavating method Download PDF

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JP2005090015A
JP2005090015A JP2003322387A JP2003322387A JP2005090015A JP 2005090015 A JP2005090015 A JP 2005090015A JP 2003322387 A JP2003322387 A JP 2003322387A JP 2003322387 A JP2003322387 A JP 2003322387A JP 2005090015 A JP2005090015 A JP 2005090015A
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ground
outer peripheral
well
groundwater
peripheral wall
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Shin Matsumoto
伸 松本
Michitaka Kono
道考 河野
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Obayashi Corp
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Obayashi Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground excavating method which contributes to improved excavation efficiency while avoiding the subsidence of the peripheral ground. <P>SOLUTION: An earth retaining wall 10 is constructed at the time of the excavation of the ground. Before or after, or in tandem with the construction of the wall 10, an outer peripheral wall 14 is formed at a location spaced a predetermined interval away from the wall 10. The outer peripheral wall 14 partially has an aquiclude portion 18 corresponding to a sandy soil stratum 16a in the ground 16. When the formation of the outer peripheral wall 14 is completed, a discharge well 20 is formed in the ground at a location between the wall 10 and the outer peripheral wall 14, and a condensate well 28 at a location outside the outer peripheral wall 14, respectively. Groundwater pumped up from the well 20 is fed to the condensate well 28, and then returned to the ground 16 via the well 28. When the discharge of pumped groundwater is started by the pumped well 20, the inside of the earth retaining wall 10 is excavated, and when the excavation reaches a preset excavation surface 12, the excavation is completed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、地盤掘削工法に関し、特に、地下水位の高い個所で地盤を掘削する際に採用される地盤掘削工法に関するものである。   The present invention relates to a ground excavation method, and more particularly, to a ground excavation method employed when excavating the ground at a location having a high groundwater level.

地盤中に土留め壁を構築して、地盤を掘削する工事において、地下水位が高い場合には、内部を掘削した際に土留め壁にかかる水圧を低減させるために、地下水位を低下させなければならない場合がある。   When excavating the ground by building a retaining wall in the ground and the groundwater level is high, the groundwater level must be lowered to reduce the water pressure on the retaining wall when excavating the interior. It may be necessary.

このような場合に採用される方法としては、例えば、非特許文献１に開示されているように、デイープウエル工法やウエルポイント工法が知られている。これらの工法では、地盤中に井戸を掘削して、揚水ポンプにより地下水を揚水して、地下水位を下げる。   As a method employed in such a case, for example, as disclosed in Non-Patent Document 1, a deep well method or a well point method is known. In these methods, a well is excavated in the ground, and groundwater is pumped by a pump to lower the groundwater level.

しかしながら、このような従来の地下水位を低下させる方法には、以下に説明する課題があった。
「土木工法事典改訂Ｖ」 産業調査会２００１年９月発行 １６９〜１７９ｐ However, such conventional methods for lowering the groundwater level have the following problems.
"Encyclopedia of Civil Engineering Law Revised V" Industry Survey September 2001 issue 169-179p

すなわち、デイープウエル工法やウエルポイント工法で、土留め壁の外側に井戸を設置する場合には、揚水に伴って、周辺の地盤に沈下が発生する。また、掘削側に井戸を設置する場合には、井戸が掘削時に邪魔になり、掘削作業の効率が低下する。   That is, when a well is installed outside the retaining wall by the deep well method or the well point method, subsidence occurs in the surrounding ground due to pumping. Moreover, when a well is installed on the excavation side, the well becomes an obstacle during excavation, and the efficiency of excavation work is reduced.

さらに、揚水した地下水は、最終的には、リチャージウエル（復水井戸）で地盤中に戻す必要があるが、揚水に伴って地下水は、周辺から揚水井戸に流入するので、リチャージウエルの本数は、揚水量によりも多く（揚水井戸の１．５〜２倍程度）必要としていた。   In addition, the pumped groundwater needs to be finally returned to the ground by a recharge well (condensate well), but since the groundwater flows into the pumped well from the surroundings with the pumping, the number of recharge wells is More than the amount of pumping (1.5 to 2 times the pumping well).

本発明は、このような従来の問題点に鑑みてなされたものであって、その目的とするところは、周辺地盤の沈下を回避しつつ、掘削能率の向上を図り、かつ、復水井戸の設置数を低減することができる地盤掘削工法を提供することにある。   The present invention has been made in view of such conventional problems, and the object of the present invention is to improve excavation efficiency while avoiding subsidence of the surrounding ground, and The object is to provide a ground excavation method capable of reducing the number of installations.

上記目的を達成するために、本発明は、地盤中に土留め壁を構築して、前記土留め壁の内部側を掘削する地盤掘削工法において、前記土留め壁の外周に、地下水の透過を阻止ないしは制限する外周壁を形成し、前記土留め壁と前記外周壁との間に揚水井戸を設けて、前記揚水井戸を介して地下水を揚水排除するようにした。   In order to achieve the above object, the present invention provides a ground excavation method in which a retaining wall is constructed in the ground and the inner side of the retaining wall is excavated. An outer peripheral wall that is blocked or restricted is formed, and a pumping well is provided between the earth retaining wall and the outer peripheral wall, and groundwater is pumped out through the pumping well.

このように構成した地盤掘削工法によれば、土留め壁の外周に、地下水の透過を阻止ないしは制限する外周壁を形成し、土留め壁と外周壁との間に揚水井戸を設けて、揚水井戸を介して地下水を揚水排除するので、外周壁により、それよりも外方側の地下水が揚水井戸側に流動することが阻止ないしは制限されるので、揚水井戸を介して地下水を揚水排除しても、周辺地盤に沈下が発生しない。   According to the ground excavation method constructed in this way, an outer peripheral wall that blocks or restricts the passage of groundwater is formed on the outer periphery of the retaining wall, and a pumping well is provided between the retaining wall and the outer peripheral wall, Since the groundwater is pumped out through the well, the outer peripheral wall prevents or restricts the flow of the groundwater on the outer side to the pumping well side, so the groundwater is pumped out through the pumping well. However, no subsidence occurs in the surrounding ground.

また、揚水井戸は、土留め壁と外周壁との間に設けるので、掘削作業に何ら影響を及ぼすことがなく、掘削の作業能率の低下も回避することができる。   Moreover, since the pumping well is provided between the earth retaining wall and the outer peripheral wall, the excavation work is not affected at all, and a reduction in excavation work efficiency can be avoided.

さらに、地下水の透過を阻止ないしは制限する外周壁により、それよりも外方側の地下水が揚水井戸側に流動することが阻止ないしは制限されるので、揚水井戸の楊水量が少なくなり、これにより、揚水井戸の設置数を低減することができるとともに、復水井戸を設ける場合にも、従来のように、揚水井戸の数よりも多く設ける必要がなくなる。   Furthermore, the outer peripheral wall that prevents or restricts the permeation of groundwater prevents or restricts the flow of groundwater on the outer side to the pumping well side, thereby reducing the amount of drowning in the pumping well. The number of pumping wells can be reduced, and when a condensate well is provided, it is not necessary to provide more than the number of pumping wells as in the prior art.

前記外周壁は、深度方向の全長に亘って地下水の透過を阻止ないしは制限する難透水性とすることができる。   The said outer peripheral wall can be made into the poor water permeability which prevents thru | or the permeation | transmission of groundwater over the full length of a depth direction.

前記外周壁は、地盤中の砂質土層に対応させて、部分的に地下水の透過を阻止ないしは制限する難透水部を設けることができる。   The outer peripheral wall can be provided with a hardly water-permeable portion that partially blocks or restricts the passage of groundwater, corresponding to the sandy soil layer in the ground.

前記外周壁の外側に復水井戸を設けて、前記揚水井戸から揚水した地下水を、前記復水井戸を介して地盤中に戻すことができる。   A condensate well is provided outside the outer peripheral wall, and groundwater pumped from the pumping well can be returned to the ground through the condensate well.

前記揚水井戸は、地盤中の砂質土層に対応させて集水部を設けることができる。   The pumping well can be provided with a water collecting portion corresponding to the sandy soil layer in the ground.

本発明にかかる地盤掘削工法によれば、周辺地盤の沈下を回避しつつ、掘削能率の向上を図り、かつ、復水井戸の設置数を低減することができる。   According to the ground excavation method according to the present invention, it is possible to improve the excavation efficiency and reduce the number of condensate wells while avoiding the settlement of the surrounding ground.

以下、本発明の好適な実施の形態について、添付図面に基づいて詳細に説明する。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.

図１および図２は、本発明にかかる地盤掘削工法の一実施例を示している。同図に示した地盤掘削工法は、地盤の路面上に障害物がなく、路面から直接土留め壁１０を構築することができる場合の適用例である。なお、図１，２においては、土留め壁１０などは、中心線に対して対称に設けられているが、その一方を省略して示している。   1 and 2 show an embodiment of a ground excavation method according to the present invention. The ground excavation method shown in the figure is an application example when there is no obstacle on the road surface of the ground and the earth retaining wall 10 can be constructed directly from the road surface. 1 and 2, the earth retaining wall 10 and the like are provided symmetrically with respect to the center line, but one of them is omitted.

地盤を掘削する際には、まず、路面上から土留め壁１０が、根切り掘削面１２よりも先端が深くなる所定深度まで構築される。このような土留め壁１０は、例えば、鋼矢板工法や連続地中壁工法により構築することができる。   When excavating the ground, first, the earth retaining wall 10 is constructed from the road surface to a predetermined depth where the tip is deeper than the root excavation surface 12. Such a retaining wall 10 can be constructed by, for example, a steel sheet pile method or a continuous underground wall method.

この土留め壁１０の構築前、後、同時進行のいずれかの時点に、土留め壁１０の外周にあって、土留め壁１０から所定の間隔を隔てた位置に外周壁１４が形成される。   The outer peripheral wall 14 is formed at a position on the outer periphery of the retaining wall 10 and at a predetermined distance from the retaining wall 10 before, after, or simultaneously with the construction of the retaining wall 10. .

この場合、地盤１６は、地下水が流通している砂質土層１６ａと、地下水の流通がない粘性土層１６ｂとが互層状態に堆積しているものとする。外周壁１４は、例えば、ソイルセメント杭工法などにより形成され、土留め壁１０の先端よりも下方に位置している砂質土層１６ａよりも深い位置まで造成される。なお、外周壁１４は、ソイルセメント杭工法以外に、例えば、深層混合工法や、薬液注入工法により形成することができる。   In this case, in the ground 16, it is assumed that a sandy soil layer 16 a in which groundwater circulates and a viscous soil layer 16 b in which groundwater does not circulate are accumulated in an alternating layer. The outer peripheral wall 14 is formed, for example, by a soil cement pile method or the like, and is formed to a position deeper than the sandy soil layer 16a located below the tip of the earth retaining wall 10. The outer peripheral wall 14 can be formed by, for example, a deep layer mixing method or a chemical solution injection method in addition to the soil cement pile method.

このような外周壁１４は、その全長を、地下水の透過を、阻止ないしは制限する難透水性とすることもできるが、本実施例の場合には、地盤１６中の砂質土層１６ａに対応させて、部分的に地下水の透過を、阻止ないしは制限する難透水部１８を設けている。   Such an outer peripheral wall 14 can be made to be hardly permeable so as to prevent or limit the permeation of groundwater, but in the present embodiment, it corresponds to the sandy soil layer 16a in the ground 16. Thus, a hardly water-permeable portion 18 that partially blocks or restricts the passage of groundwater is provided.

このようにして、地下水の透過を阻止ないしは制限する難透水部１８を部分的に設けると、全長を難透水性とする場合よりも経済的に外周壁１４を形成することができる。   In this way, if the poorly permeable part 18 that blocks or restricts the permeation of groundwater is partially provided, the outer peripheral wall 14 can be formed more economically than when the entire length is made hardly permeable.

外周壁１４において、深度方向に沿った部分で、部分的に地下水の透過を阻止ないしは制限する難透水部１８を設けるには、例えば、外周壁１４をソイルセメント杭工法により形成する場合には、難透水部１８の形成個所で、セメントミルクなどの硬化剤の添加量を増量して、所定の透水係数となるようにすればよい。   In the outer peripheral wall 14, in order to provide the hardly water permeable portion 18 that partially blocks or restricts the passage of groundwater at a portion along the depth direction, for example, when the outer peripheral wall 14 is formed by a soil cement pile construction method, What is necessary is just to increase the addition amount of hardening | curing agents, such as cement milk, so that it may become a predetermined | prescribed water permeability coefficient in the formation part of the hardly water-permeable part 18.

外周壁１４の形成が終了すると、次に、図２に示すように、土留め壁１０と外周壁１４との間に揚水井戸２０が設けられる。揚水井戸２０は、地盤の掘削孔２２を形成し、掘削孔２２内に地下水の集水部２４を設けて、掘削孔２２の下端に揚水ポンプ２６を設置して、地下水を揚水排除する。   When the formation of the outer peripheral wall 14 is finished, a pumping well 20 is then provided between the retaining wall 10 and the outer peripheral wall 14 as shown in FIG. The pumping well 20 forms a ground excavation hole 22, a groundwater collecting part 24 is provided in the excavation hole 22, and a pumping pump 26 is installed at the lower end of the excavation hole 22 to remove the groundwater.

本実施例の場合、掘削孔２２は、外周壁１４とほぼ同じ深度まで掘削され、掘削孔２２には、地盤１６中の砂質土層１６ａに対応させて、集水部２４が設けられている。集水部２６は、例えば、砕石を鉄筋籠に充填したものであって、砂質土層１６ａを流通する地下水が集められる。   In the case of the present embodiment, the excavation hole 22 is excavated to substantially the same depth as the outer peripheral wall 14, and the water collection part 24 is provided in the excavation hole 22 so as to correspond to the sandy soil layer 16 a in the ground 16. Yes. The water collection unit 26 is, for example, a crushed stone filled in a rebar, and the groundwater flowing through the sandy soil layer 16a is collected.

また、本実施例の場合には、外周壁１４の外側に復水井戸２８を設けている。この復水井戸２８は、最上層の砂質土層１６ａまで掘削された掘削孔３０と、掘削孔３０の下端に設けられた排水部３２とを備えている。揚水井戸２０から揚水した地下水は、復水井戸２８に送られて、この井戸２８を介して地盤１６中に戻される。   In the present embodiment, a condensate well 28 is provided outside the outer peripheral wall 14. The condensate well 28 includes an excavation hole 30 excavated to the uppermost sandy soil layer 16 a and a drainage portion 32 provided at the lower end of the excavation hole 30. Groundwater pumped from the pumping well 20 is sent to the condensate well 28 and returned to the ground 16 through the well 28.

揚水井戸２０により地下水の揚水排除が開始されると、土留め壁１０の内部が掘削され、その掘削が設定された根切り掘削面１２に到達すると、掘削が終了する。   When the removal of the groundwater is started by the pumping well 20, the interior of the retaining wall 10 is excavated, and when the excavation reaches the root excavation surface 12 where the excavation is set, the excavation is finished.

さて、以上のように構成された地盤掘削工法によれば、土留め壁１０の外周に、地下水の透過を阻止ないしは制限する外周壁１４を形成し、土留め壁１０と外周壁１４との間に揚水井戸２０を設けて、揚水井戸２０を介して地下水を揚水排除するので、外周壁１４により、それよりも外方側の地下水が揚水井戸２０側に流動することが阻止ないしは制限されるので、揚水井戸２０を介して地下水を揚水排除しても、周辺地盤の沈下が発生しない。   Now, according to the ground excavation method constructed as described above, the outer peripheral wall 14 that prevents or restricts the permeation of groundwater is formed on the outer periphery of the retaining wall 10, and the gap between the retaining wall 10 and the outer peripheral wall 14 is formed. Since the pumping well 20 is provided and the groundwater is pumped out via the pumping well 20, the outer peripheral wall 14 prevents or restricts the flow of groundwater on the outer side to the pumping well 20 side. Even if groundwater is pumped out through the pumping well 20, the surrounding ground does not sink.

また、揚水井戸２８は、土留め壁１０と外周壁１４との間に設けるので、掘削作業に何ら影響を及ぼすことがなく、掘削の作業能率の低下も回避することができる。   Moreover, since the pumping well 28 is provided between the earth retaining wall 10 and the outer peripheral wall 14, it does not have any influence on the excavation work, and a reduction in excavation work efficiency can be avoided.

さらに、地下水の透過を阻止ないしは制限する外周壁１４により、それよりも外方側の地下水が揚水井戸２０側に流動することが阻止されるので、揚水井戸２０の楊水量が少なくなって、井戸２０の設置数を低減することができるとともに、復水井戸２８を設ける場合にも、従来のように、揚水井戸の数よりも多く設ける必要がなくなる。   Further, since the outer peripheral wall 14 that prevents or restricts the permeation of groundwater prevents the outer groundwater from flowing to the pumping well 20 side, the amount of drowning in the pumping well 20 is reduced, and the well 20 can be reduced, and when the condensate well 28 is provided, it is not necessary to provide more than the number of pumping wells as in the prior art.

また、以上のようにして、経済的に地下水位を低下することができると、土留め壁１０にかかる主働側の側圧を大きく低下することができることから、土留め壁１０の根入れ長さを短くすることが可能になり、支保工も簡易な構造にすることもできる。   Further, if the groundwater level can be lowered economically as described above, the side pressure on the main working side applied to the retaining wall 10 can be greatly reduced. Can be shortened, and the support work can be simplified.

図３および図４は、本発明にかかる地盤掘削工法の他の実施例を示している。同図に示した地盤掘削工法は、地盤の路面上に障害物があって、路面から直接土留め壁１０を構築することができない場合の適用例であり、上記実施例と同一若しくは相当する部分には、同一符号を付してその説明を省略するとともに、以下にその特徴点についてのみ説明する。   3 and 4 show another embodiment of the ground excavation method according to the present invention. The ground excavation method shown in the figure is an application example when there is an obstacle on the road surface of the ground and the earth retaining wall 10 cannot be constructed directly from the road surface, and is the same as or equivalent to the above embodiment Are denoted by the same reference numerals, the description thereof is omitted, and only the characteristic points will be described below.

これらの図に示した実施例では、路面上に覆工部３６が設けられていて、土留め壁１０を直接地盤中に構築することができないので、まず、覆工部３６の端部に隣接して、一次土留め壁３８が構築される。   In the embodiments shown in these drawings, the lining portion 36 is provided on the road surface, and the earth retaining wall 10 cannot be directly built in the ground. Thus, the primary earth retaining wall 38 is constructed.

この一次土留め壁３８は、例えば、鋼矢板などの比較的簡易な構造のものであって、比較的浅い深度まで形成される。一次土留め壁３８が造成されると、その内部の一次掘削が行われる。一次掘削の掘削深度は、土留め壁１０を構築するための掘削機械などの設置が可能な深度とされる。   The primary earth retaining wall 38 has a relatively simple structure such as a steel sheet pile, and is formed to a relatively shallow depth. When the primary earth retaining wall 38 is created, a primary excavation is performed therein. The excavation depth of the primary excavation is a depth at which an excavating machine or the like for constructing the retaining wall 10 can be installed.

一次掘削が終了すると、土留め壁１０が所定の深度まで構築され、この土留め壁１０の構築前、後、同時進行のいずれか時点に、実施例１と同様に、土留め壁１０の外周にあって、土留め壁１０から所定の間隔を隔てた位置に外周壁１４が形成される。   When the primary excavation is completed, the retaining wall 10 is constructed to a predetermined depth, and the outer periphery of the retaining wall 10 is the same as in Example 1 before, after, or simultaneously with the construction of the retaining wall 10. Thus, the outer peripheral wall 14 is formed at a position spaced apart from the earth retaining wall 10 by a predetermined distance.

外周壁１４には、地盤１６中の砂質土層１６ａに対応させて、部分的に地下水の透過を阻止ないしは制限する難透水部１８が設けられる。外周壁１４の形成が終了すると、次に、図４に示すように、土留め壁１０と外周壁１４との間に揚水井戸２０が設けられる。揚水井戸２０は、地盤の掘削孔２２を形成し、掘削孔２２内に地下水の集水部２４を設けて、掘削孔２２の下端に揚水ポンプ２６を設置して、地下水を揚水排除する。   The outer peripheral wall 14 is provided with a hardly water-permeable portion 18 that partially blocks or restricts the passage of groundwater, corresponding to the sandy soil layer 16 a in the ground 16. When the formation of the outer peripheral wall 14 is finished, a pumping well 20 is then provided between the earth retaining wall 10 and the outer peripheral wall 14 as shown in FIG. The pumping well 20 forms a ground excavation hole 22, a groundwater collecting part 24 is provided in the excavation hole 22, and a pumping pump 26 is installed at the lower end of the excavation hole 22 to remove the groundwater by pumping up.

また、本実施例の場合にも実施例１と同様に、外周壁１４の外側に復水井戸２８が設けられ、揚水井戸２０から揚水した地下水は、復水井戸２８に送られて、この井戸２８を介して地盤１６中に戻される。   Also in the case of this embodiment, a condensate well 28 is provided outside the outer peripheral wall 14 in the same manner as in the first embodiment, and the groundwater pumped from the pumping well 20 is sent to the condensate well 28 and this well. It is returned to the ground 16 through 28.

揚水井戸２０により地下水の揚水排除が開始されると、土留め壁１０の内部が掘削され、その掘削が設定された根切り掘削面１２に到達すると、掘削が終了する。以上のように構成した実施例２の場合にも実施例１と同等の作用効果が奏される。   When the removal of the groundwater is started by the pumping well 20, the interior of the retaining wall 10 is excavated, and when the excavation reaches the root excavation surface 12 where the excavation is set, the excavation is finished. In the case of the second embodiment configured as described above, the same effects as those of the first embodiment can be obtained.

本発明にかかる地盤掘削工法は、例えば、地下構造物を構築する際の地盤掘削手段として、有効に活用することができる。   The ground excavation method according to the present invention can be effectively used as, for example, a ground excavation means when constructing an underground structure.

本発明にかかる地盤掘削工法の一実施例を示す初期状態の断面説明図である。It is sectional explanatory drawing of the initial state which shows one Example of the ground excavation method concerning this invention. 図１に引き続いて行われる工程の断面説明図である。FIG. 2 is an explanatory cross-sectional view of a process performed subsequent to FIG. 1. 本発明にかかる地盤掘削工法の他の実施例を示す初期状態の断面説明図である。It is sectional explanatory drawing of the initial state which shows the other Example of the ground excavation construction method concerning this invention. 図３に引き続いて行われる工程の断面説明図である。FIG. 4 is a cross-sectional explanatory diagram of a process performed subsequent to FIG. 3.

符号の説明Explanation of symbols

１０ 土留め壁
１２ 根切り掘削面
１４ 外周壁
１６ 地盤
１６ａ 砂質土層
１６ｂ 粘性土層
１８ 難透水部
２０ 揚水井戸
２８ 復水井戸 DESCRIPTION OF SYMBOLS 10 Earth retaining wall 12 Root cutting excavation surface 14 Outer wall 16 Ground 16a Sandy soil layer 16b Cohesive soil layer 18 Difficult-permeability part 20 Pumping well 28 Condensate well

Claims (5)

地盤中に土留め壁を構築して、前記土留め壁の内部側を掘削する地盤掘削工法において、
前記土留め壁の外周に、地下水の透過を阻止ないしは制限する外周壁を形成し、
前記土留め壁と前記外周壁との間に揚水井戸を設けて、前記揚水井戸を介して地下水を揚水排除することを特徴とする地盤掘削工法。 In the ground excavation method of constructing a retaining wall in the ground and excavating the inner side of the retaining wall,
On the outer periphery of the earth retaining wall, an outer peripheral wall that prevents or restricts permeation of groundwater is formed,
A ground excavation method, wherein a pumping well is provided between the earth retaining wall and the outer peripheral wall, and groundwater is pumped out through the pumping well. 前記外周壁は、深度方向の全長に亘って地下水の透過を阻止ないしは制限する難透水性とすることを特徴とする請求項１記載の地盤掘削工法。   2. The ground excavation method according to claim 1, wherein the outer peripheral wall has a low water permeability that prevents or restricts permeation of groundwater over the entire length in the depth direction. 前記外周壁は、地盤中の砂質土層に対応させて、部分的に地下水の透過を阻止ないしは制限する難透水部を設けることを特徴とする請求項１記載の地盤掘削工法。   2. The ground excavation method according to claim 1, wherein the outer peripheral wall is provided with a hardly water-permeable portion that partially blocks or restricts the passage of groundwater in correspondence with a sandy soil layer in the ground. 前記外周壁の外側に復水井戸を設けて、前記揚水井戸から揚水した地下水を、前記復水井戸を介して地盤中に戻すことを特徴とする請求項１または２記載の地盤掘削工法。   The ground excavation method according to claim 1 or 2, wherein a condensate well is provided outside the outer peripheral wall, and groundwater pumped from the pumping well is returned to the ground through the condensate well. 前記揚水井戸は、地盤中の砂質土層に対応させて集水部を設けることを特徴とする請求項１から３のいずれか１項記載の地盤掘削工法。   The ground excavation method according to any one of claims 1 to 3, wherein the pumping well is provided with a water collecting portion corresponding to a sandy soil layer in the ground.
JP2003322387A 2003-09-16 2003-09-16 Ground excavating method Pending JP2005090015A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011256671A (en) * 2010-06-11 2011-12-22 Ohbayashi Corp Pumping unit, soft ground improvement method, ground excavation method, contaminated soil purification method and recharge method
JP2011256670A (en) * 2010-06-11 2011-12-22 Ohbayashi Corp Pumping device, soft ground improvement method, ground excavation method, contaminated soil purification method and recharge method
CN105401587A (en) * 2015-12-29 2016-03-16 上海广联环境岩土工程股份有限公司 Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system
CN106193076A (en) * 2016-08-10 2016-12-07 上海广联环境岩土工程股份有限公司 Deep basal pit is combined the Groundwater Control method of water-bearing structure
CN109972643A (en) * 2019-05-06 2019-07-05 中国人民解放军空军工程大学 A kind of region of FuShui base pit engineering Trinity joint precipitation system
CN114457829A (en) * 2022-03-02 2022-05-10 杨宏 Deep foundation pit dewatering method for strongly weathered sandstone stratum

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011256671A (en) * 2010-06-11 2011-12-22 Ohbayashi Corp Pumping unit, soft ground improvement method, ground excavation method, contaminated soil purification method and recharge method
JP2011256670A (en) * 2010-06-11 2011-12-22 Ohbayashi Corp Pumping device, soft ground improvement method, ground excavation method, contaminated soil purification method and recharge method
CN105401587A (en) * 2015-12-29 2016-03-16 上海广联环境岩土工程股份有限公司 Water descending system for foundation pits through deep wells and shallow wells for composite stratums of large-scale foundation pits and water descending method of water descending system
CN106193076A (en) * 2016-08-10 2016-12-07 上海广联环境岩土工程股份有限公司 Deep basal pit is combined the Groundwater Control method of water-bearing structure
CN109972643A (en) * 2019-05-06 2019-07-05 中国人民解放军空军工程大学 A kind of region of FuShui base pit engineering Trinity joint precipitation system
CN114457829A (en) * 2022-03-02 2022-05-10 杨宏 Deep foundation pit dewatering method for strongly weathered sandstone stratum

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