JP2009127318A

JP2009127318A - Cutoff method for construction joint of continuous underground wall

Info

Publication number: JP2009127318A
Application number: JP2007304300A
Authority: JP
Inventors: Katsuji Fukumoto; 勝司福本; Hirosuke Ina; 啓輔伊奈; Akio Inazumi; 明夫稲積; Junichi Hirao; 淳一平尾; Kiminobu Ashida; 公伸芦田; Kenji Yamamoto; 賢司山本
Original assignee: Obayashi Corp; Denki Kagaku Kogyo KK
Current assignee: Obayashi Corp; Denka Co Ltd
Priority date: 2007-11-26
Filing date: 2007-11-26
Publication date: 2009-06-11

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for cutting off a water leakage at a construction joint of a continuous underground wall after internal excavation. <P>SOLUTION: A consolidating material such as concrete cement is placed in a ditch hole excavated from the ground surface to sequentially surround a desired area in annular shape to form the continuous underground wall 1 by jointing of successive pours, and after excavating the inside, a construction joint 4 part is cut off. At this time, when forming the continuous underground wall 1 by jointing of successive pours, an electrode member 3 is installed in advance along the construction joint 4 part on the outside, and an electrode member 5 is installed at a water leakage part of the construction joint 4 part on the inside exposed after internal excavation. The positive and negative electric potential of a direct current is applied between a pair of electrode members 3, 5. An electrolyte dissolved in underground water is thereby deposited at the water leakage part of the construction joint 4 to cut off water. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、地中連続壁の打継目地の止水方法に関するものである。 The present invention relates to a water stopping method for a joint joint of an underground continuous wall.

周知の連続地中壁工法は、地表から泥水をみたしながら所定深度まで溝状の掘削孔を形成し、鉄筋籠などの補強材を溝内に建て込んだ後に、泥水をコンクリートやセメントなどの固結材で置換してパネル状の壁体を形成し、以後は同じ作業を繰り返すことで順次壁体を横方向に打ち継いで連結形成し、所望のエリアを囲む地中連続壁を構築する。 The well-known continuous underground wall method is to form a trench-shaped excavation hole up to a predetermined depth while looking at the muddy water from the ground surface, and after installing a reinforcing material such as a reinforcing rod in the groove, A panel-like wall body is formed by replacing with a solidified material, and thereafter the same operation is repeated to successively connect the wall bodies in the horizontal direction to form a continuous underground wall surrounding a desired area. .

このような地中連続壁の構築方法では、単位壁体を順次打ち継いで連結するので、壁体同士の打継目地が必ず生じる。そして地中連続壁の構築後に内部掘削を行なう場合、とくにこの打継目地での止水性を確保する必要がある。 In such a construction method of the underground continuous wall, the unit wall bodies are successively joined and connected, so that a joint joint between the wall bodies is always generated. And when performing internal excavation after construction of the underground continuous wall, it is necessary to ensure the water-stopping property especially at this joint.

このような打継目地の止水方法として、例えば特開昭６４−５２９１５号公報にて提案されているものがある。そして、当該公報には、地中壁の後行パネル打設時に、セメントや粘土の粒子を止水体として打継目地の漏水を止水する技術が開示されている。すなわち、後行パネル打設時にコンクリートが固化する前に、打継目地部分の近傍に粘土やセメントを混合した懸濁液を注入するとともに、当該打継目地部分に一対の電極棒を設置してこれらに正負電位を加えることにより、セメントや粘土の帯電粒子を打継目地の隙間に移動させ収束させて止水するものである。 As such a water-stopping method for joints, there is one proposed in, for example, Japanese Patent Application Laid-Open No. 64-52915. And the gazette discloses a technique for stopping water leakage at the joint joint by using cement or clay particles as a water-stopping body at the time of placing a subsequent panel in the underground wall. That is, before the concrete is solidified at the time of placing the succeeding panel, a suspension in which clay or cement is mixed is injected in the vicinity of the joint area, and a pair of electrode rods are installed at the joint area. By applying positive and negative potentials to these, the charged particles of cement or clay are moved to the gaps in the joints and converged to stop the water.

また特開平６−２１２６５１号公報には、鉄筋コンクリート構造物に生じた亀裂等の損傷部からの漏水を止水するための補修技術が開示されている。これは、鉄筋コンクリート構造物の内壁面における漏水箇所を電極部材で被覆して陽極とするとともに、当該漏水箇所近傍のコンクリート表面をハツって構造物内部の鉄筋を露出させ、当該鉄筋を陰極として上記陽極との間に直流電流を流すことで、漏水中やコンクリート中に含まれる無機物を亀裂等の損傷部内に析出付着させて漏水箇所を閉塞するものである。
特開昭６４−５２９１５号公報特開平６−２１２６５１号公報 Japanese Patent Laid-Open No. 6-212651 discloses a repair technique for stopping water leakage from a damaged portion such as a crack generated in a reinforced concrete structure. This is to cover the leaking point on the inner wall surface of the reinforced concrete structure with an electrode member to make an anode, to expose the concrete surface near the leaking point to expose the reinforcing bar inside the structure, and to use the reinforcing bar as a cathode By passing a direct current between the anode and the anode, the inorganic substance contained in the leaked water or concrete is deposited in a damaged part such as a crack to close the leaked part.
JP-A-64-52915 JP-A-6-212651

しかしながら特開昭６４−５２９１５号公報に開示されている技術は、内部掘削前で地中壁内外の泥水が静止状態であることを前提としたものであって、内部掘削後に打継目地から地中壁内部に地下水が流入しているような流水状態では、止水体である粒子が打継目地内にとどまり難いので、十分な止水性を確保することが困難である。 However, the technique disclosed in Japanese Patent Application Laid-Open No. 64-52915 is based on the premise that the muddy water inside and outside the underground wall is stationary before the internal excavation. In a flowing water state in which groundwater flows into the inner wall, it is difficult to ensure sufficient water-stopping properties because particles that are water-stopping bodies hardly stay in the joint joint.

また、特開平６−２１２６５１号公報に開示されている技術は、ひび割れ部分の補修のための技術であって、コンクリート表面の一部を損壊して鉄筋を露出させる必要がある。しかも、打継目地部分には鉄筋が入っていないため、打継目地部分に生じる漏水の止水には適用することができない。 Further, the technique disclosed in Japanese Patent Application Laid-Open No. 6-212651 is a technique for repairing a cracked part, and it is necessary to damage a part of the concrete surface to expose the reinforcing bar. In addition, since the reinforcing joint is not included in the joint portion, it cannot be applied to the water stoppage of water leaking in the joint portion.

そこでこの発明は、地中連続壁の打継目地での漏水を内部掘削後に止水し得る方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a method capable of stopping water leakage at the joint joint of the underground continuous wall after internal excavation.

かかる目的を達成するために、この発明の地中連続壁の打継目地止水方法にあっては、
地表等から掘削した溝孔内にコンクリートセメントなどの固結材を打設して、所望のエリアを順次環状に囲繞して地中連続壁を打ち継ぎ形成し、該地中連続壁の内部を掘削した後に、該地中連続壁の打継目地部分を止水するに際して、
該地中連続壁の打ち継ぎ形成時に、その外側の打継目地部分に沿わせて電極部材を予め設置しておき、内部掘削後に露出した内側の打継目地部分の漏水箇所に電極部材を設置して、これら一対の電極部材間に直流の正負電位を加えることにより、地下水中に溶解した電解質を打継目地の漏水部分に析出させて止水する、ことを特徴とする。 In order to achieve such an object, in the joint seam waterproofing method of the underground continuous wall of the present invention,
Placing a solid cement such as concrete cement into a groove excavated from the ground surface, etc., surrounding the desired area in an annular shape, and forming an underground continuous wall. After the excavation, when stopping the joint joint part of the underground continuous wall,
At the time of joint formation of the underground continuous wall, an electrode member is installed in advance along the outer joint joint portion, and the electrode member is installed at the water leakage location of the inner joint joint portion exposed after the internal excavation. Then, by applying a positive / negative potential of direct current between the pair of electrode members, the electrolyte dissolved in the ground water is deposited on the water leakage portion of the joint and is stopped.

ここで、前記外側の打継目地部分に設置する電極部材を陰極とし、前記内側の打継目地部分の漏水箇所に設置する電極部材を陽極となし得る。 Here, the electrode member installed at the outer joint portion may be a cathode, and the electrode member installed at a water leakage location of the inner joint portion may be an anode.

あるいは、前記外側の打継目地部分に設置する電極部材を陽極とし、前記内側の打継目地部分の漏水箇所に設置する電極部材を陰極となし得る。 Alternatively, the electrode member installed at the outer joint portion can be used as the anode, and the electrode member installed at the water leakage location of the inner joint portion can be used as the cathode.

またこの発明においては、前記外側の打継目地部分の近傍に、地下水中に電解質を補給するための電解質供給手段が設けられていることが望ましい。 In the present invention, it is preferable that an electrolyte supply means for replenishing the electrolyte in the ground water is provided in the vicinity of the outer joint portion.

ここで、前記電解質供給手段は、内部に電解質物質を収納して前記外側の電極部材に係支されて設けられた透水性の袋体でなる構成となし得る。 Here, the electrolyte supply means may be configured by a water-permeable bag body that is provided with an electrolyte substance inside and is supported by the outer electrode member.

さらに、前記内側の打継目地部分の漏水箇所に設置する電極部材は、網状であることが望ましい。 Furthermore, it is desirable that the electrode member installed at the water leakage location of the inner joint portion is a net shape.

この発明に係るに地中壁の打継目地の止水方法によれば、地中連続壁を構築して内部を掘削した後に、その打継目地部分に生じている漏水を、その漏水中に含まれている電解質を通電により析出させて、当該析出物を止水体となして打継目地の漏水通路を塞ぐことで効果的に止水することができる。また、漏水が見つかった箇所のみを効率良く止水することができる。しかも、通電用の電極を設置するにあたって、コンクリートを削る必要がなく、損傷を与えることがない。 According to the water stoppage method for the joint joint of the underground wall according to the present invention, after the underground continuous wall is constructed and the interior is excavated, the water leakage occurring in the joint joint portion is inserted into the water leak. Water can be effectively stopped by precipitating the contained electrolyte by energization and using the deposit as a waterstop to block the water leakage passage at the joint. Moreover, it is possible to efficiently stop only the location where water leakage is found. In addition, it is not necessary to cut the concrete when installing the energization electrode, and damage is not caused.

以下、本発明の好適な実施形態例について添付図面を用いて説明する。図１は本発明に係る地中連続壁の打継目地止水方法を適用した場合の打継目地部の要部を示す拡大図である。また、図２は本発明に係る地中連続壁の打継目地止水方法の適用した場合の地中連続壁全体の概略構成を示すものであって、（ａ）は平面図、（ｂ）は同図（ａ）中のｂ−ｂ線矢視断面図である。 Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an enlarged view showing a main portion of a joint portion when the joint continuous water sealing method for an underground continuous wall according to the present invention is applied. Moreover, FIG. 2 shows the schematic structure of the whole underground continuous wall at the time of applying the joint seam sealing method of the underground continuous wall concerning this invention, (a) is a top view, (b) These are sectional views taken along the line bb in FIG.

図２（ａ），（ｂ）に示すように、地中連続壁１は地表等から掘削した溝孔内に所定長さのコンクリートパネル１ａを順次横方向に打ち継いで、所望するエリアを囲むように環状に接続して構築される。また、図１に示すように、各コンクリートパネル１ａは、掘削した溝孔内に挿入した鉄筋籠２を核として、当該溝孔内にコンクリートを打設して個別に形成される。 As shown in FIGS. 2 (a) and 2 (b), the underground continuous wall 1 surrounds a desired area by successively passing a concrete panel 1a of a predetermined length in a lateral direction in a groove excavated from the ground surface or the like. Thus, it is constructed by connecting in a ring shape. Moreover, as shown in FIG. 1, each concrete panel 1a is individually formed by placing concrete in the groove hole with the reinforcing bar 2 inserted into the excavated groove hole as a core.

そして、このような地中連続壁１を構築するにあたっては、打設済みの先行パネル１ａの横方向の端部に、後行パネル１ａを順次に打ち継いでいくが、その際に、打継目地４部分となる打設済みの先行パネル１ａの横方向の端部に、その外側の角部に沿わせて縦方向に電極部材３が予め設置される。そして、この電極部材３としては例えば鉄筋等の導電性棒状物が用いられ、当該電極部材３の長さは、その下端が少なくとも地中連続壁１内部の予定掘削深度よりも深い位置まで到達する長さとされる。 And in constructing such an underground continuous wall 1, the succeeding panel 1a is successively handed over to the lateral end of the placed preceding panel 1a. The electrode member 3 is previously installed in the vertical direction along the corners on the outer side at the end in the horizontal direction of the preceding panel 1a that has been placed, which becomes the ground 4 portion. The electrode member 3 is, for example, a conductive rod-like object such as a reinforcing bar, and the length of the electrode member 3 reaches a position where the lower end is at least deeper than the planned excavation depth inside the underground continuous wall 1. It is said to be length.

そして、多数のコンクリートパネル１ａを環状に繋いで地中連続壁１の構築が終了したならば、当該地中連続壁１にて囲まれたエリアの内部を予定深度まで掘削して、地中連続壁１の内側面を露出させる。爾後、露出した地中連続壁１の内面側各部の打継目地４部分を目視点検して漏水の有無を調べる。 When the construction of the underground continuous wall 1 is completed by connecting a large number of concrete panels 1a in a ring shape, the inside of the area surrounded by the underground continuous wall 1 is excavated to a predetermined depth, and the underground continuous The inner surface of the wall 1 is exposed. After dredging, the joint joint 4 at each part on the inner surface side of the exposed underground continuous wall 1 is visually inspected for water leakage.

そして、漏水箇所を発見した場合には、その漏水が生じている内側の打継目地４部分に沿わせて電極部材５を取り付ける。この内側の電極部材５としては、望ましくは、例えばＴｉメッシュ（チタニウム製の金網）等の金属メッシュを用い、これを広げて漏洩箇所の両側のコンクリートパネル１ａ，１ａ間に掛け渡して漏水箇所の打継目地４部分を覆って取り付ける。このように、内側の電極部材５として金属メッシュを用いれば、軽量で取り扱い性に優れるので、その取り付け作業を非常に容易に行うことができる。なお、内側に設置する電極部材５は、上記金属メッシュ製のものに限定されるものではなく、鉄筋等の導電性を有する棒状物であっても良い。 And when a water leak location is discovered, the electrode member 5 is attached along the inner joint joint 4 part which the water leak has produced. As the inner electrode member 5, desirably, for example, a metal mesh such as a Ti mesh (titanium wire mesh) is used, and this is spread and spanned between the concrete panels 1a and 1a on both sides of the leaked portion, so as to prevent the leaked portion. Cover and attach 4 joints. Thus, if a metal mesh is used as the inner electrode member 5, it is lightweight and excellent in handleability, so that the attaching operation can be performed very easily. In addition, the electrode member 5 installed inside is not limited to the thing made from the said metal mesh, The rod-shaped thing which has electroconductivity, such as a reinforcing bar, may be sufficient.

爾後、両電極部材４，５間に直流電源６を繋いで正負電位を加えて通電する。そうすると、漏水する地下水中に含まれているＣａイオンやＭｇイオンなどの電解質が陰極周辺に集積して炭酸カルシウムや水酸化マグネシウム等の析出物となって析出する。そして、当該析出物は打継目地４の漏水通路内やその侵入口あるいは漏出口で堆積成長して、やがて当該析出物が止水体を形成して漏水通路を塞ぐようになり、その漏水が抑制されて止水される。 After that, the DC power source 6 is connected between the electrode members 4 and 5, and a positive / negative potential is applied to conduct electricity. If it does so, electrolytes, such as Ca ion and Mg ion which are contained in the groundwater which leaks, will accumulate around a cathode, and will precipitate as precipitates, such as a calcium carbonate and magnesium hydroxide. And the said deposit accumulates and grows in the leaking passage of the joint joint 4 or its ingress or outlet, and eventually the said precipitate forms a water blocking body and closes the leaking passage, and the leakage is suppressed. The water is stopped.

ここで、特に、地中連続壁１の外側に配設した電極部材３を陰極にする一方、内側に配設した電極部材５を陽極にした場合には、電解質は外側に配設した陰極の電極部材３側で析出する。このため、その析出物は、打継目地４の漏水通路に対してこれを主にその侵入口側の外側から塞いで堆積成長していくことになり、漏水通路の侵入口を迅速に閉塞して止水できる。なお、この場合にあっては、陰極側として外側に設置する電極部材３は、打継目地４に可及的に近づけて接触させるようにするのが望ましい。 Here, in particular, when the electrode member 3 disposed outside the underground continuous wall 1 is used as a cathode while the electrode member 5 disposed inside is used as an anode, the electrolyte is the cathode disposed outside. Deposited on the electrode member 3 side. For this reason, the deposits are deposited and grown on the leakage passage of the joint 4 mainly from the outside on the entrance side, and the entrance of the leakage passage is quickly blocked. Can stop the water. In this case, it is desirable that the electrode member 3 installed outside as the cathode side is brought into contact with the joint 4 as close as possible.

また、これとは逆に、地中連続壁１の内側に配設した電極部材５を陰極にする一方、外側に配設した電極部材３を陽極にした場合には、打継目地４の漏水通路内に外側の侵入口から浸透してくる漏水中の電解質が、地中連続壁１の内側に配設した電極部材５側で析出する。このため、その析出物は打継目地４の漏水通路に対してこれを主にその漏水口側の内側から塞いでその内部に堆積成長していくことになる。よって、当該漏水通路内に電解質を効率よく析出させて、当該漏水通路内の奥深くまで堆積成長させることができて、漏水通路の止水性を良好に確保して止水することができる。なお、この場合にあっては、陽極側として外側に設置する電極部材３は、打継目地４には接触させずに離間させておき、ＣａイオンやＭｇイオンなどの電解質が漏水と共に漏水通路内に侵入するのを阻害しないようにするのが望ましい。 On the other hand, when the electrode member 5 disposed inside the underground continuous wall 1 is used as a cathode while the electrode member 3 disposed outside is used as an anode, water leakage from the joint 4 The electrolyte in the leaking water that permeates into the passage from the outside intrusion deposits on the electrode member 5 side disposed inside the underground continuous wall 1. For this reason, the deposit is deposited and grown in the leakage passage of the joint joint 4 mainly from the inside of the leakage opening side. Therefore, the electrolyte can be efficiently deposited in the water leakage passage, and can be deposited and grown deeply in the water leakage passage, so that the water stoppage of the water leakage passage can be secured well and water can be stopped. In this case, the electrode member 3 installed outside as the anode side is separated from the joint 4 without being in contact with the electrolyte, and electrolytes such as Ca ions and Mg ions are leaked together with the water leakage in the water leakage passage. It is desirable not to prevent entry into the

また、図示していないが、地中連続壁１の外側には、打継目地４部分の近傍に位置させて、地下水中にＣａイオンやＭｇイオンなどの電解質を補給するための電解質供給手段を設けるようにしても良い。このような電解質供給手段を設ければ、地下水中に本来的に含有されているＣａイオンやＭｇイオンなどの電解質が量的に不足している場合であっても、これを補って止水体の形成が不充分となる事態を防止することができる。 Moreover, although not shown in figure, the electrolyte supply means for replenishing electrolytes, such as Ca ion and Mg ion, is located in the vicinity of the joint joint 4 part in the outer side of the underground continuous wall 1, and is supplied to groundwater. You may make it provide. If such an electrolyte supply means is provided, even if the electrolytes such as Ca ions and Mg ions originally contained in the ground water are quantitatively insufficient, this is compensated for. A situation where the formation is insufficient can be prevented.

ここで、当該電解質供給手段の具体的な一例としては、水を透過する袋体の内部に炭酸カルシウムや水酸化マグネシウム等の電解質物質を収納して、当該袋体を外側に設置した電極部材３に係止させておくことが考えられる。このような電解質供給手段を設けておけば、周囲の地下水中にＣａイオンやＭｇイオンなどの電解質を溶け出させて補給し得、打継目地４近傍における地下水中の電解質濃度及び漏水通路に侵入する漏水中の電解質濃度を高めておくことができる。なお、上記袋体の内容物は、他のカルシウム化合物やマグネシウム化合物等の電解質物質により代替することも可能である。 Here, as a specific example of the electrolyte supply means, an electrode member 3 in which an electrolyte substance such as calcium carbonate or magnesium hydroxide is accommodated in a bag body that transmits water and the bag body is installed outside. It is conceivable to keep it locked. If such an electrolyte supply means is provided, electrolytes such as Ca ions and Mg ions can be dissolved and replenished in the surrounding groundwater, and the electrolyte concentration in the groundwater and the water leakage passage in the vicinity of the joint 4 can be infiltrated. The electrolyte concentration in the leaking water can be increased. The contents of the bag can be replaced with other electrolyte materials such as calcium compounds and magnesium compounds.

以上に説明したように、この実施形態における地中連続壁の打継目地止水方法によれば、環状の地中連続壁１を形成する多数のコンクリートパネル１ａの外側の各打継目地４部分に沿わせて、予め電極部材３を設置しておくことにより、構築された地中連続壁１の内部を掘削した後にその露出された内壁面の打継目地４部分から漏水が発見された場合には、その内側の漏水箇所の打継目地４部分に電極部材５を取り付けて、それら内外に配置された一対の電極間に直流電流を通電するだけの簡単な作業で簡単に止水することができ、しかも漏水箇所のみを効率よく止水することができる。
以下、本実施形態に関する実験例とその結果を示す。 As explained above, according to the joint continuous water sealing method of the underground continuous wall in this embodiment, each joint joint 4 portion outside the multiple concrete panels 1 a forming the annular underground continuous wall 1. In the case where water leakage is found from the joint portion 4 of the exposed inner wall surface after excavating the interior of the built underground wall 1 by installing the electrode member 3 in advance along In this case, the electrode member 5 is attached to the joint portion 4 of the water leakage point on the inner side, and the water can be easily stopped by a simple operation of passing a direct current between a pair of electrodes arranged inside and outside of the electrode member 5. In addition, it is possible to efficiently stop only the water leakage point.
Hereinafter, experimental examples and results regarding this embodiment will be described.

＜実験要領＞
図３に実験装置の概略を示している。（ａ）は上面図、（ｂ）は側面図である。
（α）周壁の一側壁が並設した一対のコンクリートブロック７（コンクリートパネル１ａに相当）でなる水槽８を作製し、両コンクリートブロック７間の隙間を擬似的に打継目地４とする。水槽８内には電解質を含んだ水を貯留し、上記隙間からの漏水を受け皿９に回収して水槽８内に循環させる。上記隙間の寸法は０．１ｍｍ、０．５ｍｍ、１ｍｍの３種類に設定する。
（β）両コンクリートブロック７の外面側にその端部間に掛け渡してＴｉメッシュ（チタニウム製の金網）５を取り付ける。Ｔｉメッシュ５に陽極を繋ぎ、水槽８内の貯留水に陰極３を浸してＴｉメッシュ１ｍ^２あたり１Ａの電流密度で通電させる。
（γ）貯留水には電解質としてＣａイオンを供給するために、炭酸カルシウム１００ｇを投入する。
（δ）通電期間は、漏水が停止するまでとした。ただし、最長５０日で実験を終了した。 <Experiment procedure>
FIG. 3 shows an outline of the experimental apparatus. (A) is a top view, (b) is a side view.
(Α) A water tank 8 composed of a pair of concrete blocks 7 (corresponding to the concrete panel 1a) in which one side wall of the peripheral wall is arranged side by side is produced, and a gap between both concrete blocks 7 is used as a joint joint 4 in a pseudo manner. Water containing an electrolyte is stored in the water tank 8, and water leaked from the gap is collected in the tray 9 and circulated in the water tank 8. The size of the gap is set to three types of 0.1 mm, 0.5 mm, and 1 mm.
(Β) Ti mesh (titanium wire mesh) 5 is attached to the outer surface sides of both concrete blocks 7 between the end portions thereof. The anode is connected to the Ti mesh 5, and the cathode 3 is immersed in the stored water in the water tank 8, and the current is applied at a current density of 1 A per 1 m ^{2 of} the Ti mesh.
(Γ) In order to supply Ca ions as an electrolyte to the stored water, 100 g of calcium carbonate is added.
(Δ) The energization period was until the water leakage stopped. However, the experiment was completed in a maximum of 50 days.

＜実験結果＞
図４に実験結果を示している。（ａ）は隙間寸法０．１ｍｍ、０．５ｍｍ、１ｍｍの３ケースにつき、測定開始からの経過日数とそれぞれの漏水量の測定値を示す一覧表であり、（ｂ）は（ａ）の漏水量測定値に基づいて、それぞれのケースについて測定開始時の漏水量を１００とした、時間経過に伴う漏水量の推移を示す図である。 <Experimental result>
FIG. 4 shows the experimental results. (A) is a table showing the number of days elapsed from the start of measurement and the measured values of the amount of water leakage for three cases with gap sizes of 0.1 mm, 0.5 mm, and 1 mm, and (b) is the water leakage of (a). It is a figure which shows transition of the amount of water leakage with progress of time which set the amount of water leakage at the time of a measurement start to 100 about each case based on the amount measurement value.

図４（ｂ）を見ればわかるように、いずれのケースについても、時間経過とともに漏水量が減少する傾向が確認できた。したがって、本発明に係る止水方法により、通電時間の経過にともなって電解質が析出して隙間の閉塞が進行することが確認できた。 As can be seen from FIG. 4 (b), in any case, the tendency of the amount of water leakage to decrease with time could be confirmed. Therefore, with the water stop method according to the present invention, it was confirmed that the electrolyte was deposited and the clogging of the gap proceeded with the passage of the energization time.

本発明に係る地中連続壁の打継目地止水方法を適用した場合の打継目地部の要部を示す拡大図である。It is an enlarged view which shows the principal part of the joint joint part at the time of applying the joint joint water stop method of the underground continuous wall which concerns on this invention. 本発明に係る地中連続壁の打継目地止水方法を適用した場合の地中連続壁全体の概略構成を示すものであって、（ａ）は平面図、（ｂ）は同図（ａ）中のｂ−ｂ線矢視断面図である。BRIEF DESCRIPTION OF THE DRAWINGS It shows schematic structure of the whole underground continuous wall at the time of applying the joint water stop method of the underground continuous wall which concerns on this invention, Comprising: (a) is a top view, (b) is the figure (a It is a bb line arrow sectional view in the inside. 本実施例に係る実験装置の概略構成を例示するものであって、（ａ）は上面図、（ｂ）は側面図である。The schematic structure of the experimental apparatus which concerns on a present Example is illustrated, Comprising: (a) is a top view, (b) is a side view. 本実施例に係る実験の結果を例示するものであって、（ａ）は経過日数と漏水量の測定値を示し、（ｂ）は時間経過にともなう漏水量の推移を示している。The result of the experiment which concerns on a present Example is illustrated, Comprising: (a) shows the measured value of elapsed days and the amount of leaked water, (b) has shown transition of the amount of leaked water with progress of time.

符号の説明Explanation of symbols

１地中連続壁
１ａコンクリートパネル
２鉄筋篭
３電極部材（外側）
４打継目地
５電極部材（内側）
６直流電源 1 Underground continuous wall 1a Concrete panel 2 Reinforcing bar 3 Electrode member (outside)
4 Joint 5 Electrode member (inside)
6 DC power supply

Claims

地表等から掘削した溝孔内にコンクリートセメントなどの固結材を打設して、所望のエリアを順次環状に囲繞して地中連続壁を打ち継ぎ形成し、該地中連続壁の内部を掘削した後に、該地中連続壁の打継目地部分を止水するに際して、
該地中連続壁の打ち継ぎ形成時に、その外側の打継目地部分に沿わせて電極部材を予め設置しておき、内部掘削後に露出した内側の打継目地部分の漏水箇所に電極部材を設置して、これら一対の電極部材間に直流の正負電位を加えることにより、地下水中に溶解した電解質を打継目地の漏水部分に析出させて止水する、ことを特徴とする地中連続壁の打継目地止水方法。 Placing a solid cement such as concrete cement into a groove excavated from the ground surface, etc., surrounding the desired area in an annular shape, and forming an underground continuous wall. After the excavation, when stopping the joint joint part of the underground continuous wall,
At the time of joint formation of the underground continuous wall, an electrode member is installed in advance along the outer joint joint portion, and the electrode member is installed at the water leakage location of the inner joint joint portion exposed after the internal excavation. Then, by applying a positive / negative potential of direct current between the pair of electrode members, the electrolyte dissolved in the groundwater is deposited on the water leakage portion of the joint joint, and the water is stopped. Joint water-stop method.

前記外側の打継目地部分に設置する電極部材を陰極とし、前記内側の打継目地部分の漏水箇所に設置する電極部材を陽極とする、ことを特徴とする請求項１に記載の地中連続壁の打継目地止水方法。 2. The underground continuation according to claim 1, wherein the electrode member installed at the outer joint portion is a cathode, and the electrode member installed at a water leakage location of the inner joint portion is an anode. Wall joint joint water stop method.

前記外側の打継目地部分に設置する電極部材を陽極とし、前記内側の打継目地部分の漏水箇所に設置する電極部材を陰極とする、ことを特徴とする請求項１に記載の地中連続壁の打継目地止水方法。 2. The underground continuous according to claim 1, wherein the electrode member installed at the outer joint portion is an anode, and the electrode member installed at a water leakage location of the inner joint portion is a cathode. Wall joint joint water stop method.

前記外側の打継目地部分の近傍に、地下水中に電解質を補給するための電解質供給手段が設けられていることを特徴とする、請求項１〜３のいずれかに記載の地中連続壁の打継目地止水方法。 The underground continuous wall according to any one of claims 1 to 3, wherein an electrolyte supply means for replenishing electrolyte in groundwater is provided in the vicinity of the outer joint portion. Joint water-stop method.

前記電解質供給手段が、内部に電解質物質を収納して前記外側の電極部材に係支されて設けられた透水性の袋体でなることを特徴とする、請求項４に記載の地中連続壁の打継目地止水方法。 5. The underground continuous wall according to claim 4, wherein the electrolyte supply means is formed of a water-permeable bag body that contains an electrolyte substance therein and is supported by the outer electrode member. The joint water stop method.

前記内側の打継目地部分の漏水箇所に設置する電極部材が網状であることを特徴とする、請求項１〜５のいずれかに記載の地中連続壁の打継目地止水方法。 6. The joint seam sealing method for underground continuous walls according to any one of claims 1 to 5, wherein the electrode member installed at the water leakage location of the inside joint joint is a net-like shape.