JP2002201634A - Structure of continuous underground wall and its construction method - Google Patents
Structure of continuous underground wall and its construction methodInfo
- Publication number
- JP2002201634A JP2002201634A JP2000400576A JP2000400576A JP2002201634A JP 2002201634 A JP2002201634 A JP 2002201634A JP 2000400576 A JP2000400576 A JP 2000400576A JP 2000400576 A JP2000400576 A JP 2000400576A JP 2002201634 A JP2002201634 A JP 2002201634A
- Authority
- JP
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- Prior art keywords
- water
- wall
- continuous underground
- bag
- water blocking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、連続地中壁の構造
及びその施工方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous underground wall structure and a method of constructing the same.
【０００２】[0002]
【従来の技術】連続地中壁は、地下を壁状に掘削し、そ
の掘削した溝の中に鉄筋コンクリートを打設して築造さ
れた壁状の構造体で、土留壁、止水壁、地下室等の側壁
として使用されている。連続地中壁を決められた敷地内
に設置し、連続地中壁で取り囲んだ内側を掘削して地下
タンク、地下室等の地下構造物を構築する。地下水位以
深の地中に構造物を開削工法で築造する場合、その山留
め構造としては止水性の高い連続地中壁を施工してお
り、多くの場合は掘削底面の安定性確保のために不透水
層まで根入れすることになる。道路や鉄道構造物などの
線状構造物を地中に建設する場合、止水性の高い連続地
中壁を施工することによって、地盤中の地下水流を遮断
し、地下水阻害の問題が生じることがある。地下水阻害
の問題として、上流側は地下水位の上昇に伴う地盤の軟
弱化や湿地化を招き、更には既設構造物の不安定化や漏
水問題が生じる。下流側では地下水位の低下による地盤
沈下や井戸枯れ、沢水や湖沼の水量の減少などの被害が
生じる。こうした地下水阻害問題を解決するために、従
来より各種の工法が提案されている。 ＜イ＞連続地中壁を透水層中で止め、底版改良を行うこ
とにより、掘削底面の安定を確保する方法である。この
場合、地下水の流水は連続地中壁下端以深の自然の透水
層を通じて行われる。 ＜ロ＞連続地中壁背面に集水機能を持った通水層（例え
ば通水マット等）を設置し、地下水を集水するとともに
連通管を通して下流側に流水しようとする通水連壁工法
である。あるいは掘削側より連壁背面にボーリングを行
い、ストレーナー管（通水管）を挿入し、集水するとと
もに連通管を通して下流側に流水しようとする通水管工
法である。2. Description of the Related Art A continuous underground wall is a wall-shaped structure constructed by excavating an underground into a wall and pouring reinforced concrete into the excavated trench, and includes a retaining wall, a water blocking wall, and a basement. Etc. are used as side walls. A continuous underground wall will be installed on a designated site, and the inside surrounded by the continuous underground wall will be excavated to construct underground structures such as underground tanks and basements. When constructing structures underground below the groundwater level by open-cutting, continuous earth walls with high water-stopping properties are used as the retaining structure, and in many cases, this is not possible in order to secure the stability of the excavated bottom. It will take root to the permeable layer. When constructing linear structures such as roads and railway structures underground, the construction of continuous underground walls with high water-blocking properties can block groundwater flow in the ground and cause problems of groundwater obstruction. is there. As a problem of groundwater obstruction, the upstream side causes softening of the ground and wetlands due to the rise of the groundwater level, and furthermore, instability of existing structures and problems of water leakage. On the downstream side, damages such as land subsidence and well wither due to lowering of groundwater level, and decrease in water volume in swamps and lakes will occur. In order to solve such a groundwater obstruction problem, various construction methods have been conventionally proposed. <B> This method is to secure the stability of the excavated bottom by stopping the continuous underground wall in the permeable layer and improving the bottom slab. In this case, groundwater flows through a natural permeable layer deeper than the lower end of the continuous underground wall. <B> Install a water-permeable layer (for example, a water-permeable mat) with a water-collecting function on the back of the continuous underground wall to collect groundwater and flow water downstream through the communication pipe. It is. Alternatively, a boring method is used in which drilling is performed on the back side of the connecting wall from the excavation side, a strainer pipe (a water pipe) is inserted, water is collected, and water flows downstream through the connecting pipe.
【０００３】[0003]
【本発明が解決しようとする課題】しかしながら、前記
した従来の地下水阻害問題の解決方法にあっては、次の
ような問題点がある。 ＜イ＞前者の連続地中壁を透水層中で止める方法は、底
版改良を全長にわたって行う必要があり、コストが高く
なる。また掘削底面の盤ぶくれに対する安定性を確保す
るために、設計上底版改良厚さを過大にしてしまう可能
性がある。また地下構造物の規模によっては、連続地中
壁を透水層中で止める方法を採用することができない。 ＜ロ＞後者の通水連壁工法あるいは通水管工法は、長期
的には集水管、集水マット等の通水層に目詰まりが発生
する虞があるため、メンテナンスを必要とする。また砂
層等の限界流速の小さい層においては、設計的に限界流
速以下の流速で集水することが困難であり、目詰まりを
起す可能性が極めて大きい。However, the conventional method for solving the problem of groundwater obstruction has the following problems. <B> The former method of stopping the continuous underground wall in the permeable layer requires the improvement of the bottom slab over the entire length, which increases the cost. In addition, in order to ensure stability of the bottom of the excavation against bulging, there is a possibility that the improved thickness of the bottom slab is excessively designed. Further, depending on the size of the underground structure, a method of stopping the continuous underground wall in the permeable layer cannot be adopted. <B> The latter method requires a maintenance because there is a possibility that a water-collecting layer such as a water collecting pipe or a water collecting mat may be clogged in a long term. Further, in a layer having a small critical velocity such as a sand layer, it is difficult to collect water at a velocity lower than the critical velocity by design, and the possibility of clogging is extremely large.
【０００４】[0004]
【本発明の目的】本発明は上記したような従来の問題点
に鑑みて考えられたもので、施工中は確実な止水性を確
保でき、施工後は通水性を確保するようにした連続地中
壁の構造及びその施工方法を提供することを目的とす
る。また本発明は、長期的に目詰まりを起すことがな
く、確実な通水性を確保できるようにした連続地中壁の
構造及びその施工方法を提供することを目的とする。更
に本発明は、施工後、通水機能を有する連続地中壁を安
いコストで施工できるようにした連続地中壁の構造及び
その施工方法を提供することを目的とする。本発明は、
上記目的のうち少なくとも一つを達成するようにしたも
のである。SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned conventional problems, and it is possible to secure a certain water stopping property during construction and to ensure continuous water permeability after construction. An object of the present invention is to provide a structure of a middle wall and a construction method thereof. Another object of the present invention is to provide a continuous underground wall structure and a method for constructing the same, which can ensure reliable water permeability without causing clogging over a long period of time. It is a further object of the present invention to provide a structure of a continuous underground wall having a water-passing function after construction and which can be constructed at a low cost, and a method of constructing the continuous underground wall. The present invention
At least one of the above objects is achieved.
【０００５】[0005]
【課題を解決するための手段】上記のような目的を達成
するために、本発明の連続地中壁の構造は、構造壁とし
て機能する構造壁部分と、止水壁として機能する止水壁
部分と、からなり、前記止水壁部分に流体を注入または
抜き出すことによって着脱可能な止水膜を配置したこと
を特徴としている。また本発明の連続地中壁の構造は、
前記止水膜が複数の略円筒状の可撓性の袋体からなり、
各袋体の上端から地表側まで接続する複数の注入管によ
って流体を注入または抜き出すようにしたことを特徴と
している。また本発明の連続地中壁の施工方法は、前記
した連続地中壁の構造を構築するための溝孔を掘削する
工程と、前記溝孔に注入管を取り付けた略円筒状の可撓
性の袋体を複数設置する工程と、前記注入管から前記袋
体へ流体を注入する工程と、コンクリート打設部分をシ
ート部材で囲む工程と、構造壁部分に鉄筋篭を建て込む
工程と、コンクリートを打設する工程と、止水壁として
の使用が終了した後に、前記注入管より前記袋体の流体
を抜き出しながら袋体の外側に注水する工程と、前記袋
体を撤去する工程と、撤去した袋体が配置されていた止
水壁部分に透水材を充填する工程と、からなる。また本
発明の連続地中壁の施工方法は、止水壁部分と構造壁部
分を仕切るように袋体の上部に仕切部材を配置する工程
を追加することができる。In order to achieve the above object, the structure of the continuous underground wall according to the present invention comprises a structural wall portion functioning as a structural wall and a waterproof wall functioning as a waterproof wall. And a water blocking film that is detachable by injecting or extracting a fluid into or from the water blocking wall portion. The structure of the continuous underground wall of the present invention is as follows.
The water blocking film comprises a plurality of substantially cylindrical flexible bags,
It is characterized in that fluid is injected or extracted by a plurality of injection pipes connected from the upper end of each bag body to the ground surface side. Further, the method for constructing a continuous underground wall of the present invention includes a step of excavating a slot for constructing the structure of the continuous underground wall, and a substantially cylindrical flexible pipe having an injection pipe attached to the slot. A plurality of bags, a step of injecting a fluid from the injection pipe into the bags, a step of surrounding a concrete casting portion with a sheet member, a step of embedding a reinforced cage in a structural wall portion, And after the use as a water blocking wall is completed, a step of injecting the bag body with water while extracting the fluid of the bag body from the injection pipe, a step of removing the bag body, and removing Filling a water-permeable material into the water blocking wall portion where the formed bag is disposed. Further, the method for constructing a continuous underground wall according to the present invention can include a step of arranging a partition member on the upper portion of the bag body so as to partition the water blocking wall portion and the structural wall portion.
【０００６】[0006]
【本発明の実施の形態】以下図面を参照しながら、本発
明に係る実施の形態について説明する。Embodiments of the present invention will be described below with reference to the drawings.
【０００７】＜イ＞全体の構成 本発明の連続地中壁１は、止水壁部分１１と、構造壁部
分１０の鉄筋コンクリートとからなる。止水壁部分１１
は応力的に機能せず、単に止水壁として機能する部分
で、この止水壁部分の上部に構造壁部分１０が配置され
る。連続地中壁１は、通常は透水層５２の更に以深の不
透水層５３まで根入れする。ユニット単位の連続地中壁
１を必要に応じて連結して構築予定の地下構造物５５の
周囲を取り囲むようにして築造するものである。<A> Overall Configuration The continuous underground wall 1 of the present invention comprises a water blocking wall portion 11 and a reinforced concrete of a structural wall portion 10. Water stop wall part 11
Is a part which does not function in terms of stress but merely functions as a water stop wall, and the structural wall part 10 is disposed above the water stop wall part. The continuous underground wall 1 is usually buried deeper than the permeable layer 52 to the impermeable layer 53. The underground structures 1 to be constructed are constructed by connecting the continuous underground walls 1 in units as necessary and surrounding the underground structure 55 to be constructed.
【０００８】＜ロ＞止水膜 止水壁部分１１の一部に止水膜２を配置する。止水膜２
は、略円筒状の袋体２０を複数配置して構成する。袋体
２０は、止水壁部分１１に配置することができるよう
に、長手方向の大きさは止水壁部分１１の長さに略一致
している。袋体２０は遮水性及び可撓性を有しており、
後述するようにエアーまたは水等の流体を注入すること
によって膨らむようになっている。袋体２０が膨らんで
袋体２０同士又は溝壁５１（土層）に隙間なく当接して
止水性を維持するようになっている。図１では、袋体２
０を前後左右に４個配置して止水膜２を構成している
が、袋体２０の配置及び個数は設計事項であるので任意
に選択することができる。各袋体２０の上部には夫々注
入管３を取り付けている。<B> Water-Stopping Film The water-stopping film 2 is disposed on a part of the water-stop wall portion 11. Water blocking film 2
Is configured by arranging a plurality of substantially cylindrical bags 20. The length of the bag body 20 in the longitudinal direction is substantially equal to the length of the water stop wall portion 11 so that the bag body 20 can be disposed on the water stop wall portion 11. The bag body 20 has water shielding and flexibility,
As will be described later, the air is expanded by injecting a fluid such as air or water. The bags 20 are inflated and abut against the bags 20 or the groove wall 51 (soil layer) without any gap to maintain the water stopping property. In FIG. 1, the bag 2
The water-stop membrane 2 is configured by arranging four 0s in front, back, left and right, but the arrangement and the number of the bag bodies 20 can be arbitrarily selected because they are design matters. The injection pipe 3 is attached to the upper part of each bag 20 respectively.
【０００９】＜ハ＞注入管 注入管３は、細長く円筒状に形成する。注入管３は、後
述するコンクリート１４打設の際、コンクリート１４の
側圧で押し潰されることがないように、例えば鋼管など
で構成するのが好ましい。注入管３は構造壁部分１０内
において鉛直方向に配置され、その一端は袋体２０の上
部に着脱自在に取り付け、他端は地表に突き出し、地上
のエアーまたは水等の供給施設（図示せず）に接続す
る。注入管３の内側には袋体２０の一部であるチューブ
２１と、これとは別の注入チューブ３１を配置してい
る。チューブ２１及び注入チューブ３１は、夫々注入管
３の内側に沿って注入管３と同じように地上のエアーま
たは水等の供給施設に接続している。注入チューブ３１
の先端開口３２は、袋体２０の外側に位置している（図
２参照）。<C> Injection tube The injection tube 3 is formed to be elongated and cylindrical. The injection pipe 3 is preferably made of, for example, a steel pipe so as not to be crushed by the lateral pressure of the concrete 14 at the time of casting the concrete 14 described later. The injection pipe 3 is disposed vertically in the structural wall portion 10, one end of which is detachably attached to the upper part of the bag body 20, the other end protrudes to the surface of the ground, and a supply facility for air or water on the ground (not shown). ). A tube 21 which is a part of the bag body 20 and another injection tube 31 are arranged inside the injection tube 3. The tube 21 and the injection tube 31 are connected to a supply facility such as air or water on the ground in the same manner as the injection tube 3 along the inside of the injection tube 3. Injection tube 31
Is located outside the bag body 20 (see FIG. 2).
【００１０】＜ニ＞構造フレーム 止水壁部分１１に構造フレーム４を設置する。構造フレ
ーム４は溝孔５０に設置することができるように、例え
ば鉄骨等からなる縦材と横材を組み合わせて形成する。
構造フレーム４の上部で、且つ止水膜２の上部に鉄板等
の仕切板４１を設置する。即ち、仕切板４１は止水壁部
分１１と構造壁部分１０を仕切るようになっている。仕
切板４１には注入管３が通り抜けるように、注入管３が
位置する箇所に孔を開口している。仕切板４１はコンク
リート１４を打設した際、コンクリート１４の圧力によ
って止水膜２が押し潰されないようにこれを保護するた
めのものである。<D> Structural frame The structural frame 4 is installed on the water blocking wall portion 11. The structural frame 4 is formed by combining a vertical member and a horizontal member made of, for example, a steel frame so that the structural member 4 can be installed in the slot 50.
A partition plate 41 such as an iron plate is provided above the structural frame 4 and above the water blocking film 2. That is, the partition plate 41 partitions the water blocking wall portion 11 and the structural wall portion 10. A hole is opened in the partition plate 41 at a position where the injection pipe 3 is located so that the injection pipe 3 can pass therethrough. The partition plate 41 is for protecting the water blocking film 2 from being crushed by the pressure of the concrete 14 when the concrete 14 is cast.
【００１１】＜ホ＞構造壁部分 構造壁部分１０は、連続地中壁１の構造壁として機能す
る部分である。構造壁部分１０は、鉄筋篭１２と打設コ
ンクリート１４とからなる。鉄筋篭１２は公知のもので
棒鋼を組み立てて構成し、築造される連続地中壁１の芯
材としての役割を果たす。打設されたコンクリート１４
が打設箇所以外に回り込むことがないように（特に止水
膜２の部分に回り込むことがないように）、コンクリー
ト１４打設部分をシート部材１３で囲っておく。シート
部材１３は、コンクリート１４の漏出を確実に防止でき
る性能を有するとともに溝壁５１の凹凸により容易に破
れることがないように、その材質としては例えばキャン
パスシート等が適している。<E> Structural Wall Portion The structural wall portion 10 is a portion that functions as a structural wall of the continuous underground wall 1. The structural wall portion 10 includes a reinforced cage 12 and a cast concrete 14. The rebar basket 12 is a well-known one and is constructed by assembling steel bars, and serves as a core material of the continuous underground wall 1 to be built. Cast concrete 14
The concrete 14 casting part is surrounded by the sheet member 13 so that the concrete 14 does not go around other than the casting place (especially so as not to go around the water blocking film 2). The material of the sheet member 13 is, for example, a campus sheet or the like so as to have a performance of reliably preventing the leakage of the concrete 14 and to prevent the concrete member 14 from being easily broken by the unevenness of the groove wall 51.
【００１２】次に連続地中壁の施工方法について説明す
る。Next, a method of constructing the continuous underground wall will be described.
【００１３】＜イ＞袋体の配置（図３ａ） 連続地中壁１の施工に際しては、連続地中壁１を構築す
るための溝孔５０を掘削する。溝孔５０は、地中を壁状
に掘削して形成し、連続地中壁１を不透水層５３まで根
入れするようにする。予め作製しておいた構造フレーム
４をクレーン（図示せず）等で吊り下げながら溝孔５０
に挿入する。構造フレーム４を溝孔５０に挿入したら、
袋体２０をクレーンで吊り下げながら溝孔５０に挿入す
る。この場合、袋体２０のチューブ２１を注入管３に挿
し込み、また注入チューブ３１も注入管３に挿し込んだ
状態で注入管３を袋体２０の上部に取り付けておき、こ
の状態で注入管３と一緒に袋体２０を溝孔５０に挿入す
るのが施工上好ましい。順次袋体２０を溝孔５０に挿入
し、構造フレーム４で囲まれた止水壁部分１１に例えば
４個の袋体２０を前後左右に配置する。袋体２０を止水
膜部分１１に配置したら、仕切板４１を止水壁部分１１
と構造壁部分１０に配置する。仕切板４１に開口した穴
に注入管３を挿し込みながらクレーンで仕切板４１を吊
り下ろし、構造フレーム４の上部に載せることによっ
て、簡単に仕切板４１を止水壁部分１１と構造壁部分１
０に配置することができる。なお、袋体２０、注入管
３、構造フレーム４及び仕切板４１を一体に組み付けた
状態で溝孔５０に挿入することもできる。<A> Arrangement of Bags (FIG. 3a) When constructing the continuous underground wall 1, a slot 50 for constructing the continuous underground wall 1 is excavated. The slot 50 is formed by excavating the underground into a wall shape, and the continuous underground wall 1 is buried to the impermeable layer 53. While hanging the structural frame 4 prepared in advance with a crane (not shown) or the like, the slot 50 is formed.
Insert When the structural frame 4 is inserted into the slot 50,
The bag body 20 is inserted into the slot 50 while being suspended by a crane. In this case, the tube 21 of the bag 20 is inserted into the injection tube 3, and the injection tube 31 is also inserted into the injection tube 3, and the injection tube 3 is attached to the upper part of the bag 20. It is preferable to insert the bag body 20 into the slot 50 together with 3. The bags 20 are sequentially inserted into the slots 50, and, for example, four bags 20 are arranged in front, rear, left and right on the water blocking wall portion 11 surrounded by the structural frame 4. After the bag body 20 is disposed on the water blocking film portion 11, the partition plate 41 is connected to the water blocking wall portion 11.
And the structural wall portion 10. The partition plate 41 is hung down by a crane while inserting the injection pipe 3 into the hole opened in the partition plate 41 and placed on the upper part of the structural frame 4, so that the partition plate 41 can be easily connected to the water blocking wall portion 11 and the structural wall portion 1.
0 can be placed. In addition, the bag body 20, the injection pipe 3, the structural frame 4, and the partition plate 41 can be inserted into the slot 50 in a state where they are integrally assembled.
【００１４】＜ロ＞袋体へ流体の注入（図３ｂ） 地上施設からエアーまたは水を袋体２０に注入する。エ
アーまたは水は、ポンプ等（図示せず）によってチュー
ブ２１を介して袋体２０へ充填加圧される。袋体２０は
膨張し、袋体２０同士が密着し、また袋体２０が溝壁５
１に接する側は溝壁５１の凹凸になじんだ状態となる。
このようにして袋体２０が膨張して止水効果の大きい止
水膜２を形成し、地下構造物５５等を構築するときに地
下水が流入しないようにする。<B> Injecting fluid into bag (FIG. 3b) Air or water is injected into bag 20 from the ground facility. Air or water is filled into the bag body 20 via the tube 21 by a pump or the like (not shown) and pressurized. The bag 20 expands, the bags 20 adhere to each other, and the bag 20 is
The side in contact with 1 is in a state of adjusting to the unevenness of the groove wall 51.
In this way, the bag body 20 expands to form the water blocking film 2 having a large water stopping effect, and prevents the inflow of ground water when constructing the underground structure 55 or the like.
【００１５】＜ハ＞構造壁部分の構築（図３ｃ） 鉄筋篭１２をクレーンで吊り、溝孔５０から挿入して仕
切板４１上に設置して、鉄筋篭１２を建て込む。コンク
リート１４打設部分をシート部材１３で囲っておく。な
お、後述するように止水壁としての使用が終了した後
は、止水膜２は撤去され透水材６と置き換えられるの
で、通水性を確保させるために止水膜２が溝壁５１と接
する箇所にはシート部材１３を配置しないようにする。
鉄筋篭１２を建て込んだ溝孔５０に、公知の方法により
コンクリート１４を打設して構造壁部分１０を構築す
る。コンクリート１４打設の際、仕切板４１が設置され
ているので、またシート部材１３が配置されているの
で、打設されたコンクリート１４が止水膜２の部分に回
り込むことがない。このようにして止水壁部分１１と構
造壁部分１０を構築して連続地中壁１を構築し、順次同
様の施工手順を繰り返して隣り合う連続地中壁１同士を
連結して所定の範囲に連続地中壁１を構築する。<C> Construction of structural wall portion (FIG. 3c) The reinforced cage 12 is suspended by a crane, inserted from the slot 50 and set on the partition plate 41, and the reinforced cage 12 is built. The concrete 14 casting part is surrounded by the sheet member 13. After the use as the water blocking wall is finished as described later, the water blocking film 2 is removed and replaced with the water permeable material 6, so that the water blocking film 2 contacts the groove wall 51 to ensure water permeability. The sheet member 13 is not arranged at the position.
Concrete 14 is cast into the slot 50 in which the reinforcing bar 12 is built by a known method to construct the structural wall portion 10. When the concrete 14 is cast, since the partition plate 41 is installed and the sheet member 13 is arranged, the cast concrete 14 does not go around the water blocking film 2. In this way, the water blocking wall portion 11 and the structural wall portion 10 are constructed to construct the continuous underground wall 1, and the same construction procedure is sequentially repeated to connect the adjacent continuous underground walls 1 to each other so as to form a predetermined area. A continuous underground wall 1 is constructed.
【００１６】＜ニ＞地下構造物の構築（図４） 連続地中壁１を決められた敷地内に設置したら、連続地
中壁１で取り囲んだ内側を掘削する。連続地中壁１には
止水膜２が形成されているので、止水性を維持すること
ができ、止水壁として使用することができる。したがっ
て、連続地中壁１で取り囲んだ内側を掘削しても地下水
が流入することがなく、地下タンク、地下室等の地下構
造物５５を効率よく構築することができる。また止水膜
２には流体が充填されているので、掘削時の振動等を吸
収することができる。<D> Construction of Underground Structure (FIG. 4) When the continuous underground wall 1 is installed in a predetermined site, the inside surrounded by the continuous underground wall 1 is excavated. Since the water blocking film 2 is formed on the continuous underground wall 1, the water stopping property can be maintained, and the water blocking film 2 can be used as a water blocking wall. Therefore, even if the inside surrounded by the continuous underground wall 1 is excavated, underground water does not flow in, and an underground structure 55 such as an underground tank or a basement can be efficiently constructed. Further, since the water blocking film 2 is filled with the fluid, vibrations and the like during excavation can be absorbed.
【００１７】＜ホ＞止水膜より流体の抜き出し（図５
ａ） 地下構造物５５を構築し、止水壁としての使用が終了し
たら袋体２０に充填加圧されている流体（エアーまたは
水）を抜き出す。流体の抜き出しは、地上施設の吸引ポ
ンプ等をチューブ２１に接続して行う。袋体２０から流
体を抜き出すことによって、溝壁５１の崩壊が懸念され
るので、袋体２０から流体を抜き出すと同時に水等を袋
体２０の外側へ注入チューブ３１を介して注水する。<E> Extraction of fluid from the water blocking film (FIG. 5)
a) The underground structure 55 is constructed, and when the use as the water blocking wall is completed, the fluid (air or water) filled and pressurized in the bag body 20 is extracted. Extraction of the fluid is performed by connecting a suction pump or the like of a ground facility to the tube 21. Since the collapse of the groove wall 51 may be caused by extracting the fluid from the bag 20, water or the like is injected through the injection tube 31 to the outside of the bag 20 at the same time as the fluid is extracted from the bag 20.
【００１８】＜ヘ＞止水膜の撤去（図５ｂ） 袋体２０から流体を抜き出したら、地上側よりチューブ
２１を引っ張りながら袋体２０を注入管３から引き抜
く。袋体２０は可撓性があるので、注入管３の内側に沿
って簡単に引き抜くことができる。このようにして、順
次袋体２０を引き抜いて止水膜２を撤去する。<F> Removal of the water blocking film (FIG. 5b) After the fluid is extracted from the bag 20, the bag 20 is pulled out from the injection pipe 3 while pulling the tube 21 from the ground side. Since the bag body 20 is flexible, it can be easily pulled out along the inside of the injection tube 3. In this manner, the bag 20 is sequentially pulled out to remove the water blocking film 2.
【００１９】＜ト＞透水材の充填（図５ｃ） 止水膜２を撤去することによって空洞が生じる。注入管
３より砕石、栗石、砂利等の透水材６を投入して空洞を
充填する。これにより止水膜２は透水材６に置き換えら
れ、連続地中壁１の両側を連通する通路を形成する。こ
の通路によって地下水が連続地中壁１間を自由に移動す
ることができるようになる。したがって、地下水は上流
側から下流側へ移動し、従来の地下水阻害問題が生じる
ことがない。また、透水材６は砕石等で構成しているの
で、従来のような集水管、集水マット等の通水層と異な
り、長期的にも目詰まりが発生することなく、メンテナ
ンスを必要とすることもない。<G> Filling with water-permeable material (FIG. 5c) By removing the water blocking film 2, a cavity is formed. A permeable material 6, such as crushed stone, chestnut stone, or gravel, is charged from the injection pipe 3 to fill the cavity. As a result, the water blocking film 2 is replaced with the water permeable material 6 to form a passage communicating both sides of the continuous underground wall 1. This passage allows the groundwater to move freely between the continuous underground walls 1. Therefore, the groundwater moves from the upstream side to the downstream side, and the conventional groundwater obstruction problem does not occur. Further, since the water permeable material 6 is made of crushed stone or the like, unlike a conventional water collecting layer such as a water collecting pipe or a water collecting mat, maintenance is required without causing clogging even in a long term. Not even.
【００２０】[0020]
【本発明の効果】本発明の連続地中壁の構造及びその施
工方法は、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。 ＜イ＞止水膜を配置したことにより止水壁として使用す
ることができ、施工中は確実な止水性を確保できるよう
にした。また止水性を確保することによって、掘削内に
地下水が入り込むことがないので、掘削底面の盤ぶくれ
に対する安定性を確保するための底版改良厚さを極力小
さくすることができる。 ＜ロ＞止水壁としての使用が終了した後は、止水膜は透
水材に置き換えられる。このため、長期的に目詰まりが
発生することなく、確実に通水性を確保した連続地中壁
とすることができる。 ＜ハ＞止水膜は可撓性の袋体に流体を注入するだけの簡
単な構成で止水性を確保しており、従来のように底版改
良を全長にわたって行う必要がなく、コストの縮減が図
られる。 ＜ニ＞砕石等で構成した透水材により、地下水は連続地
中壁の一部を通過して下流側へ流水されるので、砂層等
の限界流速の小さい層においても目詰まりを起すことが
ない。またメンテナンスを不要とすることができる。The structure of the continuous underground wall of the present invention and the construction method thereof are as described above, and the following effects can be obtained. <A> The provision of the water-blocking film enables it to be used as a water-blocking wall, so that a reliable water-blocking property can be ensured during construction. In addition, since the groundwater is prevented from entering into the excavation by securing the water stoppage, the improved thickness of the bottom slab for securing the stability of the excavation bottom against the bulging can be minimized. <B> After the use as the water blocking wall is finished, the water blocking film is replaced with a water permeable material. For this reason, it is possible to provide a continuous underground wall that reliably ensures water permeability without causing clogging in the long term. <C> The water-blocking film secures water-blocking with a simple structure just by injecting fluid into the flexible bag, and it is not necessary to improve the bottom plate over the entire length as in the conventional case, reducing costs. It is planned. <D> Since the groundwater flows through a part of the continuous underground wall and flows downstream due to the permeable material composed of crushed stone, etc., clogging does not occur even in a layer such as a sand layer having a small critical flow velocity. . Also, maintenance can be eliminated.
【図１】連続地中壁の構造の説明図。FIG. 1 is an explanatory view of a structure of a continuous underground wall.
【図２】止水膜の斜視図。FIG. 2 is a perspective view of a water blocking film.
【図３】連続地中壁の施工手順を示す説明図。FIG. 3 is an explanatory view showing a construction procedure of a continuous underground wall.
【図４】連続地中壁を止水壁として使用している状態を
示す説明図。FIG. 4 is an explanatory view showing a state in which a continuous underground wall is used as a water stop wall.
【図５】袋体を引き抜いて透水材を充填する手順を示す
説明図。FIG. 5 is an explanatory diagram showing a procedure for pulling out a bag body and filling a permeable material.
１・・・連続地中壁 １０・・構造壁部分 １１・・止水壁部分 １２・・鉄筋篭 １３・・シート部材 １４・・コンクリート ２・・・止水膜 ２０・・袋体 ３・・・注入管 ６・・・透水材 DESCRIPTION OF SYMBOLS 1 ... Continuous underground wall 10 ... Structural wall part 11 ... Water blocking wall part 12 ... Reinforced basket 13 ... Sheet member 14 ... Concrete 2 ... Water blocking film 20 ... Bag 3 ...・ Injection pipe 6 ・ ・ ・ Permeable material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中村隆良 東京都新宿区西新宿一丁目25番１号 大成 建設株式会社内 (72)発明者 田辺清 東京都新宿区西新宿一丁目25番１号 大成 建設株式会社内 Ｆターム(参考） 2D049 EA01 EA15 GB01 GE01 GG01 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takayoshi Nakamura 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Kiyoshi Tanabe 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation F term (reference) 2D049 EA01 EA15 GB01 GE01 GG01
Claims (3)
て着脱可能な止水膜を配置したことを特徴とする、連続
地中壁の構造。1. A water blocking film, comprising: a structural wall portion functioning as a structural wall; and a water blocking wall portion functioning as a water blocking wall. The structure of the continuous underground wall, which is arranged.
いて、前記止水膜は、複数の略円筒状の可撓性の袋体か
らなり、各袋体の上端から地表側まで接続する複数の注
入管によって流体を注入または抜き出すようにしたこと
を特徴とする、連続地中壁の構造。2. The continuous underground wall structure according to claim 1, wherein the water blocking film comprises a plurality of substantially cylindrical flexible bags, and is connected from an upper end of each bag to a ground surface. A continuous underground wall structure wherein the fluid is injected or withdrawn through a plurality of injection pipes.
中壁の構造を構築するための溝孔を掘削する工程と、 前記溝孔に注入管を取り付けた略円筒状の可撓性の袋体
を複数設置する工程と、 前記注入管から前記袋体へ流体を注入する工程と、 コンクリート打設部分をシート部材で囲む工程と、 構造壁部分に鉄筋篭を建て込む工程と、 コンクリートを打設する工程と、 止水壁としての使用が終了した後に、前記注入管より前
記袋体の流体を抜き出しながら袋体の外側に注水する工
程と、 前記袋体を撤去する工程と、 撤去した袋体が配置されていた止水壁部分に透水材を充
填する工程と、からなる、 連続地中壁の施工方法。3. A step of digging a slot for constructing a continuous underground wall structure according to claim 1 or 2, and a substantially cylindrical flexible pipe having an injection pipe attached to said slot. Installing a plurality of bag bodies of the above, a step of injecting fluid from the injection pipe into the bag body, a step of surrounding a concrete casting part with a sheet member, a step of embedding a reinforced cage in a structural wall part, and concrete. After the use as a water blocking wall is completed, a step of injecting water into the outside of the bag while extracting the fluid of the bag from the injection pipe; a step of removing the bag; Filling a water-permeable material into the water-blocking wall portion where the closed bag was disposed, and a method of constructing a continuous underground wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000400576A JP4558188B2 (en) | 2000-12-28 | 2000-12-28 | Continuous underground wall structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000400576A JP4558188B2 (en) | 2000-12-28 | 2000-12-28 | Continuous underground wall structure and construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002201634A true JP2002201634A (en) | 2002-07-19 |
| JP4558188B2 JP4558188B2 (en) | 2010-10-06 |
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ID=18865141
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|---|---|---|---|
| JP2000400576A Expired - Fee Related JP4558188B2 (en) | 2000-12-28 | 2000-12-28 | Continuous underground wall structure and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109944280A (en) * | 2019-04-16 | 2019-06-28 | 上海长凯岩土工程有限公司 | Pre-assembled underground continuous wall connector water sealing structure |
| CN110387908A (en) * | 2019-07-26 | 2019-10-29 | 深圳市建工集团股份有限公司 | The rear pouring tape construction method of multilayer constraint antiseep |
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|---|---|---|---|---|
| JPH11166229A (en) * | 1997-12-03 | 1999-06-22 | Kubota Corp | Groundwater vein restoring method making use of steel pipe column earth retaining wall |
| JP2000054420A (en) * | 1998-08-10 | 2000-02-22 | Shimizu Corp | Method of forming water passing part in underground continuous wall |
| JP2000170158A (en) * | 1998-12-02 | 2000-06-20 | Randekku:Kk | Recharging method for underground stream intercepted by construction of linear underground structure |
-
2000
- 2000-12-28 JP JP2000400576A patent/JP4558188B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11166229A (en) * | 1997-12-03 | 1999-06-22 | Kubota Corp | Groundwater vein restoring method making use of steel pipe column earth retaining wall |
| JP2000054420A (en) * | 1998-08-10 | 2000-02-22 | Shimizu Corp | Method of forming water passing part in underground continuous wall |
| JP2000170158A (en) * | 1998-12-02 | 2000-06-20 | Randekku:Kk | Recharging method for underground stream intercepted by construction of linear underground structure |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109944280A (en) * | 2019-04-16 | 2019-06-28 | 上海长凯岩土工程有限公司 | Pre-assembled underground continuous wall connector water sealing structure |
| CN109944280B (en) * | 2019-04-16 | 2024-04-09 | 上海长凯岩土工程有限公司 | Water stopping structure of preassembled underground diaphragm wall connector |
| CN110387908A (en) * | 2019-07-26 | 2019-10-29 | 深圳市建工集团股份有限公司 | The rear pouring tape construction method of multilayer constraint antiseep |
| CN110387908B (en) * | 2019-07-26 | 2021-07-06 | 深圳市建工集团股份有限公司 | Multi-layer restraining anti-leakage post-pouring belt construction method |
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| Publication number | Publication date |
|---|---|
| JP4558188B2 (en) | 2010-10-06 |
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