JP3892576B2 - Maintenance method of water vein in underground retaining wall construction section - Google Patents

Maintenance method of water vein in underground retaining wall construction section Download PDF

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JP3892576B2
JP3892576B2 JP07915598A JP7915598A JP3892576B2 JP 3892576 B2 JP3892576 B2 JP 3892576B2 JP 07915598 A JP07915598 A JP 07915598A JP 7915598 A JP7915598 A JP 7915598A JP 3892576 B2 JP3892576 B2 JP 3892576B2
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water
underground
retaining
construction
vein
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JPH11269869A (en
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信幸 田中
正人 椋浦
貴志 中澤
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タナカ重機建設株式会社
五洋建設株式会社
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【0001】
【発明の属する技術分野】
本発明は、地下構造物の構築に伴う地下水脈の分断を防止して、自然の環境を阻害することなく地下構築物の建設が施工でき、構築後も水脈を維持できる地下擁壁構築部における水脈の維持管理方法に関するものである。
【0002】
【従来の技術】
近時、生活環境の変化と環境整備などの推進に伴い市街地などでの地下鉄道の建設や、高速道路トンネル,共同溝工事などの地下工事が多く行われるようになり、その計画路線に従って地下深く掘削する土木作業が行われるに伴い地下水脈の分断が作業の進行に重要な事項となっている。そして、通常掘削作業を行うにあたっては、事前に掘削部の路線に沿って両側に鋼矢板を打ち込んで土留め壁を構築し、掘削部への土砂崩れや浸水を防止する手段とされている。あるいは、工事区間の掘削部分の両側に連続壁を掘削構築して土留めするような工法も採られている。
【0003】
このような土留め用擁壁の構築は、地下構築物の建設に際して、その作業の安全性と作業性を確保するために不可欠の付帯工事であり、特に止水効果を重視して連続壁などの擁壁が構築されている。また、地下構築物の建設工事に不可欠の止水擁壁は、とりもなおさず地中に従来形成されている地下水脈を時として分断することになる。このような地下水脈の分断は、地下水位に高低差が生じて、自然の環境を破壊することになり、建設工事が行われている近隣の地区での生活環境に大きな変化を与えることになる。また、上流側では地下水のダムアップ低減や擁壁土圧の上昇を抑える必要性から、その擁壁に穴をあけて地下水を下水管に流すなどの対策が必要になり費用が多くかかることになる。しかも、このような処置は地下水位の均等化にはならず、環境破壊の問題解決には至らない。
【0004】
このような問題点を解決する試みが、本出願人の発明に係るものとして、特開平7−224420号公報で開示されるように、連続土留壁を構築する工程で、その一部に上下方向の通水性を有する部分を設け、この通水性を有する部分(通水路)に水のバイパス管を繋いで水脈が分断されるのを防止する地下水非遮断土留壁構築工法が提案されている。その土留壁中に形成される通水性を有する部分(通水路)としては、砂利などが充填された柱状の構成とされている。
【0005】
【発明が解決しようとする課題】
しかしながら、前記公報により開示されている地下水非遮断土留壁構築工法による場合、地中に存在する水脈がバイパス管を経て土留壁中に構築されている通水路を通り、上流側から下流側に流れるように連絡するものとされるので、自然の状態で形成されている水脈とは異なり、人工的に構築される通水路には自然と水流に乗って微細な土粒が流入して長期間のうちに通水路を形成している砂利などによる空隙を埋め、水の流れが途絶えることになるという問題点がある。特に、工事中の土留壁として構築されたものは、地下工事が終わると地上面から所要の深さまで切取って埋め戻しすることになっている。このようなことから、前述のように通水路が目詰まりする事態に到ると、水脈の断絶を復活するために再構築することは、その近辺の構築物の設置状況にもよるが実施不能な場合が多く、仮に再構築可能としても非常に多くの費用を要することになるという問題がある。
【0006】
本発明は、このような問題点を解決するためになされたもので、地下水脈を分断することなく上流側から下流側への流路を形成するために設けられた地中擁壁中に形成の通水路を、構築後においても簡単に再生できて地下水脈の断絶を防止できるようにする、地下擁壁構築部における水脈の維持管理方法を提供することを目的とするものである。
【0007】
【課題を解決するための手段および作用・効果】
前述された目的を達成するために、本発明の地下擁壁構築部における水脈の維持管理方法は、連続して構築された擁壁により地中水脈が分断される場所に設けられる上下方向に充填材を充填してなる通水路の上端部に、地上面から適宜深さのマンホールを設け、前記通水路の内部には、隣接しないようにしていずれも上端を前記マンホール内に臨ませて通水路の底部に到る洗浄水注入管と下端を通水路上層部に位置するように配される汚水排出管とを配設し、前記洗浄水注入管から通水路に圧力水を注入して通水路内を洗浄することを特徴とするものである。
【0008】
こうすると、構築された地中擁壁にて分断されている地下水脈が、擁壁の構築後長期間バイパス管から通水路を通じて連通しているうちに、土砂などの微粒が通水路を構成する充填材の空隙を埋めて流通間隙が狭まる、目詰まりが生じるのを、定期的にあるいは不定期にマンホール内において洗浄水注入管から圧力水を通水路内底部に圧送すれば、その注入圧によって上昇する水流により充填材に付着して空隙を埋めている土砂などの微粒が洗い落とされて空隙を復活させ、目詰まりを解消させて水脈を正常に戻すことができるのである。
【0009】
そして、地下擁壁を構築する時点で、予め前述のような通水路構築位置にその通水路の維持を図るマンホールと洗浄水注入管・汚水排出管を設けておけば、通水路の設置位置が明確にされるとともに、定期・不定期に係わらず通水状態の維持管理が容易になり、長期にわたり環境保全を容易に管理できるという効果を奏するのである。
【0010】
また、前記マンホール内において通水路の上端には開閉蓋を取り付けて、充填材の減少が認められたときには補充充填できるようにされているのが好ましい。こうしておけば、通水路の点検時に、地中での水流の変化や地盤の変動などで通水路の充填材が沈下することで当初の充填量より減少していても、この開閉蓋を開いて充填材を補充することができる利点が生じる。また、前記開閉蓋を通水路上端に取り付けておくことにより充填材の洗浄を行うときに、洗浄汚水の排出を汚水排出管から排出できるので廃水処理が便利になる。
【0011】
本発明においては、前記通水路の上端に設けられるマンホールについて、その寸法形状は点検作業者が内部に入って維持管理作業を行う状態にするのみならず、地上部において直接的に洗浄水注入管に注水して洗浄できるような簡易型のものとすることができる。このようにすれば、設置時の費用を低減できる利点がある。なお、マンホールについては、その寸法や作業時の対応に係わらず蓋を設けて通常時に維持管理に支障のない構造とするのがよい。
【0012】
【発明の実施の態様】
次に、本発明による地下擁壁構築部における水脈の維持管理方法の具体的な実施の形態につき、図面を参照しつつ説明する。
【0013】
図1に、本発明に係る地下擁壁構築部における水脈の維持管理方法を実施する通水部の概要図が、図2に、図1におけるII−II視拡大平断面図が、それぞれ示されている。図3は通水路の上部に設けられるマンホールの平面図を表している。
【0014】
これらの図において、まず図1によって示されるのは、本発明に係る地下擁壁構築部における水脈の維持管理方法を実施する通水部の概要であって、地下工事などのために地下水非遮断土留め壁(連続地下擁壁)構築工法によって施工された、例えば地下道路構築部での連続する地下擁壁1に上下方向の通水路2が設けられ、その上部に、維持管理のためにマンホール10が設けられる。その通水路2は、地下擁壁1の構築時に、地下に水脈Cが存在する地盤Bにおいて長さ方向に所要の間隔(例えば10m間隔)で地盤を仕切る地下擁壁1の一部に設けられる。
【0015】
この通水路2の設置概要は、図2に示される擁壁の一部平断面図で表わされるように、連続して地中に穿削形成された横方向に連通する立孔に挿入されるH型鋼などによる杭Dで区切られた一画に設けられるのであって、具体的な図示は省略するが地下水脈と通じる範囲の深さまで地上側から挿入されるチューブを水などの注入で膨らませて後に擁壁構成のためのスラリーを注入硬化させ、そのスラリーの硬化後に前記チューブ内の水を排出してそのチューブを収縮させてから引き抜くと、前記チューブの配置後に地盤に解放される柱状の空間部が形成される。そこで、形成された柱状の空間部に、図1で示されるように底部に達するまでの洗浄水注入管5と、上部に短い排水管6とを配置して、空間部内に砕石あるいは砂利などの充填材3を投入して空隙のある通水路2を形成しておくのである。
【0016】
前述のようにして構築された地下擁壁1に設けられる通水路2には、図4にて示される地下水非遮断擁壁の構築の一例を示す概要図で表すように、地下水脈Cが通じている地盤Bを横断して構築された地下擁壁1の内側で地下水脈Cの上流側から下流側に通じるバイパス管20が接続される。このバイパス管20によって、地下工事が行われる区間を挟んで反対側に構築された地下擁壁1に前記同様の構造で設けられる通水路2と繋がれて地下水脈Cが維持される。
【0017】
このようにして地下水脈Cの連通流動が確保された後、地下工事が進捗完成したならば、予め規定されている工事終了後の地表部の埋め戻し基準に従って地下擁壁1の上部が地上面から所要の寸法切断して撤去され、埋め戻されて地上部の仕上げ工事が行われる。このために、通常は前述の通水路2の構築部分も同様に埋め戻されることになる。すると、通水路2の上部が埋め戻されると地中に封じられてこの通水路の確認ができず、通水空間の維持ができなくなる。そこで、この埋め戻し作業の際に、当該通水路2の上部に図1〜図3で表すように、所要寸法のマンホール10を設け、このマンホール10内に前記洗浄水注入管5と排水管6の上端部を突き出させておくとともに、通水路2の上端に開閉可能に蓋13を取り付けて、メンテナンスができるようにするのである。もちろん、このマンホール10の上端にはマンホール蓋11を被せて交通、その他に支障がないようにしておく。なお、前記洗浄水注入管5と排水管6の上端にはそれぞれバルブ(図示省略)を取付けておくのが好ましい。
【0018】
このようにしておけば、地下工事が完了して後、地中における地下水脈Cの一部を構成する通水路2には、常時地下水が流れることにより、その流れとともに泥土も通水路2内に流入することになり、長期間のうちに通水路2に充填されている砂利などの充填材3に泥土が付着することが避けられない。したがって、その充填材3に泥土が付着することによって流動空間が狭められる結果、地下水脈Cの流れが正常でなくなり、下流側では井戸涸れなど不自然な事態を招くので、管理者などが定期的にマンホール蓋11を開けてマンホール10内に入り、別途準備した洗浄水の供給設備(水道からの給水ができない場合は洗浄水用のタンクローリーと洗浄用ポンプとの組合わせた装置を使用する)におけるポンプ(図示せず)から洗浄水注入管5に配管するとともに、排水管6端にも排水用の管またはホースを接続して、好ましくはバキューム車(図示せず)の汚水回収タンクに繋ぎ、通水路2内に洗浄水注入管5を通じて圧力水を注入する。こうすれば、圧力水が洗浄水注入管5により通水路2の底部から充填材3内を通って強制的に上方に流動され、この圧力水流によって目詰まり状態になっている泥土が洗い流されて排水管6から外部に排出される(バキューム車に繋がれている場合は、その汚水回収タンクに受け入れられる)。
【0019】
したがって、排水管6を通じて地上部に排出される洗浄排水の浄化状態を管理作業者が確認することにより、通水路2内の目詰まりの可否を確かめ、排水が清透水になるまで洗浄水を注入することで通水路2の浄化を図り、地下水脈Cの正常性を維持することができるのである。
【0020】
このような操作を各通水路2ごとに定期的に行うようにすれば、地下構築物の設置に伴う地下水脈の分断が解消されて自然界の保全を長期にわたり維持できることになる。もちろん、通水路2を再構築するようなことなく恒久的に保持できることになる。
【0021】
また、本実施例によれば、地下工事が完了して埋め戻しが行われた後にあっても、地下擁壁1の一部に作られた通水路2の位置が地表部に設けられるマンホール10によってその存在位置を確認することができ、爾後の地下水脈の維持管理における目印となり、その管理作業を容易にすることになる。
【0022】
以上の説明においては、正常な地下水脈の維持管理について述べたが、地下構築物の設置場所の地形や地質によっては地下水脈に異常が発生し、地下擁壁1に沿って構築されている通水路2の地山に解放されている側で充填材3が水流などによって掬い取られ、定常の高さ(マンホール内底部付近)までに止まらず表面的に沈下状態になっていると、そのままでは正常な通水路2の維持ができなくなるおそれが生じる。したがって、このような状態が確認できるように、マンホール10内で通水路2の上端に設けた蓋13を開いて充填材3の状態を確認し、沈下状態を呈している場合は減少量を補充して支障のないようにするのがよい。なお、この通水路2の頂部に蓋13を設けておくのは、前述の圧力水による充填材3の洗浄作業時、通水路2から直接洗浄汚水が流れ出すのを防止して、排水処理を正しく行わせるのを有効にするためである。
【0023】
また、本発明の趣旨に則すれば、地下工事終了時における地上部での埋め戻しに際して、前述のように通水路の上部にマンホールを設置するのに代えて、図示省略するが、当該通水路を地表部まで残し、その上端部に小型の点検孔としてその通水路2の平断面よりやや大きな直径で比較的浅い空間部を設け、この空間部に前述の圧力洗浄水注入管5端と排水管6端が位置するようにして点検蓋により閉じるようにしてもよい。なお、通水路の目詰まり点検・並びに洗浄処理については、前述の場合と同様にして行えばよい。このような構成にすれば、その設置費用が低減できることになる。但し、この場合も通水路の頂部が蓋により閉じられるようにするのが好ましい。
【0024】
本実施例における排水管6は、本発明の汚水排出管に対応する。
【図面の簡単な説明】
【図1】図1は、本発明に係る地下擁壁構築部における水脈の維持管理方法を実施する通水部の概要図である。
【図2】図2は、図1におけるII−II視拡大平断面図である。
【図3】図3は、通水路の上部に設けられるマンホールの平面図である。
【図4】図4は、地下水非遮断擁壁の構築の一例を示す概要図である。
【符号の説明】
1 地下擁壁
2 通水路
3 通水路の充填材
5 洗浄水注入管
6 排水管
10 マンホール
11 マンホール蓋
13 通水路の蓋
20 バイパス管
B 地盤
C 地下水脈
D 擁壁中の杭
[0001]
BACKGROUND OF THE INVENTION
The present invention prevents the fragmentation of the underground water vein associated with the construction of the underground structure, enables construction of the underground structure without hindering the natural environment, and maintains the water vein after the construction. It is related to the maintenance management method.
[0002]
[Prior art]
Recently, along with the promotion of changes in the living environment and environmental maintenance, construction of subway roads in urban areas, highway tunnels, joint ditch construction, etc., has been carried out a lot, and deep underground according to the planned route As civil engineering work is carried out, the division of groundwater veins has become an important factor in the progress of the work. And when performing normal excavation work, steel sheet piles are driven in advance on both sides along the route of the excavation part to construct earth retaining walls, which are means for preventing landslides and flooding to the excavation part. Alternatively, a construction method in which a continuous wall is excavated and built on both sides of the excavation portion of the construction section is also adopted.
[0003]
The construction of retaining walls for earth retaining is an incidental work to ensure the safety and workability of construction of underground structures. Retaining walls are being built. In addition, the water retaining wall, which is indispensable for the construction work of underground structures, will sometimes divide underground water veins that have been formed in the ground. This division of groundwater veins will cause a difference in groundwater level, destroying the natural environment, and will greatly change the living environment in the neighborhood where construction works are being carried out. . Also, on the upstream side, it is necessary to reduce the dam-up of groundwater and suppress the rise of retaining wall earth pressure, so it is necessary to take measures such as making a hole in the retaining wall and flowing the groundwater into the sewer pipe, which is expensive. . Moreover, such treatment does not equalize the groundwater level and does not solve the problem of environmental destruction.
[0004]
As an attempt to solve such a problem, as disclosed in Japanese Patent Application Laid-Open No. 7-224420 as an invention of the present applicant, in a process of constructing a continuous retaining wall, a part thereof is vertically oriented. A groundwater non-blocking retaining wall construction method has been proposed in which a portion having water permeability is provided, and a water bypass pipe is connected to the portion having water permeability (water passage) to prevent the water vein from being divided. The water-permeable portion (water channel) formed in the earth retaining wall has a columnar structure filled with gravel or the like.
[0005]
[Problems to be solved by the invention]
However, in the case of the groundwater non-blocking retaining wall construction method disclosed in the above publication, the water vein existing in the ground flows from the upstream side to the downstream side through the water passage constructed in the retaining wall through the bypass pipe. Therefore, unlike the water veins that are formed in the natural state, the artificially constructed waterways naturally flow along with the water flow and fine soil particles flow in for a long time. There is a problem that the flow of water is interrupted by filling a gap due to gravel that forms a water passage. In particular, what was built as a retaining wall under construction is to be cut back from the ground surface to the required depth and backfilled after the underground work is completed. For this reason, when the water channel is clogged as described above, it is impossible to reconstruct to restore the disconnection of the water vein, although it depends on the installation status of the nearby structures. There are many cases, and there is a problem that even if reconstruction is possible, a very high cost is required.
[0006]
The present invention has been made to solve such problems, and is formed in an underground retaining wall provided to form a flow path from the upstream side to the downstream side without dividing the underground water vein. It is an object of the present invention to provide a method for maintaining and managing the water vein in the underground retaining wall construction section, which can easily regenerate the water passage after construction and prevent the breakage of the underground water vein.
[0007]
[Means for solving the problems and actions / effects]
In order to achieve the above-described object, the method of maintaining a water vein in the underground retaining wall construction part of the present invention is filled in the vertical direction provided in a place where the underground water vein is divided by the continuously constructed retaining wall. A manhole having an appropriate depth from the ground surface is provided at the upper end of the water channel filled with the material, and the water channel is arranged so that the upper end faces the manhole so that the manhole is not adjacent to the inside of the water channel. A washing water injection pipe that reaches the bottom of the sewage and a sewage discharge pipe that is arranged so that the lower end is located in the upper part of the water channel, and injecting the pressure water from the cleaning water injection pipe into the water channel The inside is washed.
[0008]
In this way, fine particles such as earth and sand make up the waterway while the groundwater veins divided by the built underground retaining wall continue to communicate through the waterway from the bypass pipe for a long time after the construction of the retaining wall. Filling the gap in the filler and narrowing the flow gap, or clogging occurs regularly or irregularly by sending pressure water from the wash water injection pipe to the bottom of the water channel in the manhole. Ascending water flow removes fine particles such as earth and sand that adhere to the filler and fill the gaps, restore the gaps, eliminate clogging, and return the water veins to normal.
[0009]
At the time of constructing the underground retaining wall, if the manhole and the washing water injection pipe / sewage discharge pipe for maintaining the water passage are provided in advance at the water passage construction position as described above, the installation position of the water passage can be determined. In addition to being clarified, it is easy to maintain and maintain the water flow state regardless of whether it is regular or irregular, and can easily manage environmental conservation over a long period of time.
[0010]
Further, it is preferable that an opening / closing lid is attached to the upper end of the water passage in the manhole so that refilling can be performed when a decrease in the filling material is recognized. In this way, when the waterway is inspected, even if the filling material in the waterway sinks due to changes in the water flow in the ground or changes in the ground, the opening / closing lid can be opened. The advantage that the filler can be replenished arises. Further, when the filling material is washed by attaching the opening / closing lid to the upper end of the water channel, the waste water treatment becomes convenient because the washing waste water can be discharged from the waste water discharge pipe.
[0011]
In the present invention, the size and shape of the manhole provided at the upper end of the water passage is not only in a state where the inspection worker enters the inside and performs maintenance work, but also in the washing water injection pipe directly on the ground part. It can be of a simple type that can be poured and washed. In this way, there is an advantage that the installation cost can be reduced. In addition, about a manhole, it is good to provide a cover irrespective of the dimension and the response | compatibility at the time of work, and make it a structure which does not have trouble in maintenance management at normal time.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a specific embodiment of the water vein maintenance method in the underground retaining wall construction unit according to the present invention will be described with reference to the drawings.
[0013]
FIG. 1 shows a schematic diagram of a water flow section for carrying out the water vein maintenance method in the underground retaining wall construction section according to the present invention, and FIG. 2 shows an enlarged cross-sectional view taken along line II-II in FIG. ing. FIG. 3 shows a plan view of a manhole provided in the upper part of the water passage.
[0014]
In these figures, first shown by FIG. 1 is an outline of a water flow section that implements a method for maintaining a water vein in an underground retaining wall construction section according to the present invention. For example, a water passage 2 in the vertical direction is provided on the continuous underground retaining wall 1 constructed by the earth retaining wall (continuous underground retaining wall) construction method. 10 is provided. The water passage 2 is provided in a part of the underground retaining wall 1 that partitions the ground at a required interval (for example, an interval of 10 m) in the length direction in the ground B where the water vein C exists in the basement when the underground retaining wall 1 is constructed. .
[0015]
The outline of the installation of the water passage 2 is inserted into a standing hole that is continuously drilled in the ground and communicated in the lateral direction, as shown in the partial cross-sectional view of the retaining wall shown in FIG. It is provided in a section divided by a pile D made of H-shaped steel, etc., and although not specifically shown, a tube inserted from the ground side is inflated by injecting water or the like up to a depth that reaches the groundwater vein. A columnar space that is released to the ground after the placement of the tube when the slurry for retaining wall construction is injected and cured, and after the slurry is cured, the water in the tube is discharged and the tube is contracted and then pulled out. Part is formed. Therefore, in the formed column-shaped space part, as shown in FIG. 1, a washing water injection pipe 5 to reach the bottom part and a short drain pipe 6 are arranged on the upper part, and crushed stones or gravel is placed in the space part. The filler 3 is introduced to form a water passage 2 having a gap.
[0016]
As shown in the schematic diagram showing an example of the construction of the non-groundwater retaining wall shown in FIG. 4, the waterway 2 provided in the underground retaining wall 1 constructed as described above communicates with the groundwater vein C. A bypass pipe 20 that leads from the upstream side of the underground water vein C to the downstream side is connected to the inside of the underground retaining wall 1 constructed across the ground B. The bypass pipe 20 is connected to the water passage 2 provided in the same structure as the underground retaining wall 1 constructed on the opposite side across the section where the underground work is performed, and the underground water vein C is maintained.
[0017]
When the underground construction is completed after the flow of the groundwater vein C is secured in this way, the upper part of the underground retaining wall 1 is placed on the ground surface in accordance with the ground surface backfilling standard after the completion of construction. The required dimensions are cut off and removed, and backfilled to finish the ground part. For this reason, the construction part of the above-described water passage 2 is usually backfilled in the same manner. Then, when the upper part of the water channel 2 is backfilled, it is sealed in the ground, and this water channel cannot be confirmed, and the water flow space cannot be maintained. Therefore, at the time of this backfilling operation, as shown in FIGS. 1 to 3, a manhole 10 having a required size is provided in the upper part of the water passage 2, and the washing water injection pipe 5 and the drain pipe 6 are provided in the manhole 10. The upper end portion of the water passage 2 is protruded and a lid 13 is attached to the upper end of the water passage 2 so as to be openable and closable so that maintenance can be performed. Of course, a manhole cover 11 is put on the upper end of the manhole 10 so as not to interfere with traffic and the like. In addition, it is preferable to attach a valve (not shown) to the upper ends of the washing water injection pipe 5 and the drain pipe 6, respectively.
[0018]
In this way, after underground work is completed, groundwater always flows into the waterway 2 that forms a part of the underground waterway C in the ground, so that mud also flows into the waterway 2 along with that flow. It will flow in and it is inevitable that mud adheres to the filler 3 such as gravel filled in the water passage 2 over a long period of time. Therefore, as a result of the mud soil adhering to the filler 3, the flow space is narrowed. As a result, the flow of the groundwater vein C is not normal, and an unnatural situation such as well drowning is caused on the downstream side. Open the manhole cover 11 and enter the manhole 10, and in a separately prepared cleaning water supply facility (if a water supply from the water supply is not possible, use a combination of a cleaning water tank lorry and a cleaning pump) A pipe (not shown) is connected to the washing water injection pipe 5 and a drain pipe or hose is connected to the end of the drain pipe 6 and is preferably connected to a sewage recovery tank of a vacuum car (not shown). Pressure water is injected into the water passage 2 through the washing water injection pipe 5. In this way, the pressure water is forced to flow upward from the bottom of the water passage 2 through the filler 3 by the washing water injection pipe 5, and the mud that is clogged by this pressure water flow is washed away. It is discharged to the outside from the drain pipe 6 (if it is connected to a vacuum vehicle, it is accepted into the sewage recovery tank).
[0019]
Therefore, the management operator confirms whether or not clogging in the water passage 2 is possible by confirming the purification state of the cleaning drainage discharged to the ground through the drain pipe 6 and injects the cleaning water until the drainage becomes clear permeated water. By doing so, it is possible to purify the water channel 2 and maintain the normality of the groundwater vein C.
[0020]
If such an operation is performed periodically for each water channel 2, the fragmentation of the underground water vein associated with the installation of the underground structure is eliminated, and the conservation of the natural world can be maintained for a long time. Of course, the water channel 2 can be permanently maintained without restructuring.
[0021]
In addition, according to the present embodiment, the manhole 10 in which the position of the water passage 2 formed in a part of the underground retaining wall 1 is provided on the ground surface even after the underground work is completed and backfilling is performed. The location can be confirmed by this, and it becomes a mark in the maintenance management of the groundwater vein after dredging, and the management work is facilitated.
[0022]
In the above description, the maintenance of normal groundwater veins has been described. However, depending on the topography and geology of the installation site of the underground structure, abnormalities occur in the groundwater veins, and the waterway constructed along the underground retaining wall 1 If the filler 3 is scooped off by the water flow etc. on the side that is released to the ground of No. 2, and does not stop until the normal height (near the bottom of the manhole), it is normal as it is There is a possibility that the maintenance of the proper water passage 2 becomes impossible. Therefore, the lid 13 provided at the upper end of the water passage 2 is opened in the manhole 10 to check the state of the filler 3 so that such a state can be confirmed. It is better to make sure that there is no problem. In addition, the lid 13 is provided on the top of the water passage 2 so that the cleaning waste water can be prevented from flowing out directly from the water passage 2 during the cleaning operation of the filler 3 with the above-mentioned pressure water. This is to make it effective.
[0023]
Further, in accordance with the gist of the present invention, when backfilling on the ground at the end of the underground work, instead of installing a manhole at the top of the water passage as described above, although not shown, the water passage Is left to the surface, and a relatively shallow space with a slightly larger diameter than the plane cross section of the water passage 2 is provided as a small inspection hole at the upper end, and the end of the pressure washing water injection pipe 5 and the drainage are provided in this space. You may make it close with an inspection cover so that the pipe | tube 6 end may be located. In addition, the clogging check and cleaning process of the water passage may be performed in the same manner as described above. With such a configuration, the installation cost can be reduced. However, in this case as well, it is preferable that the top of the water passage be closed by a lid.
[0024]
The drain pipe 6 in the present embodiment corresponds to the sewage discharge pipe of the present invention.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a water flow section that implements a water vein maintenance method in an underground retaining wall construction section according to the present invention.
FIG. 2 is an enlarged cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a plan view of a manhole provided in the upper part of the water passage.
FIG. 4 is a schematic diagram showing an example of construction of a groundwater non-blocking retaining wall.
[Explanation of symbols]
1 Underground Retaining Wall 2 Waterway 3 Waterway Filling Material 5 Washing Water Injection Pipe 6 Drainage Pipe 10 Manhole 11 Manhole Cover 13 Waterway Cover 20 Bypass Pipe B Ground C Groundwater Drain Pile in Retaining Wall

Claims (2)

  1. 連続して構築された擁壁により地中水脈が分断される場所に設けられる上下方向に充填材を充填してなる通水路の上端部に、地上面から適宜深さのマンホールを設け、前記通水路の内部には、隣接しないようにしていずれも上端を前記マンホール内に臨ませて通水路の底部に到る洗浄水注入管と下端を通水路上層部に位置するようにされる汚水排出管とを配設し、前記洗浄水注入管から通水路に圧力水を注入して通水路内を洗浄することを特徴とする地下擁壁構築部における水脈の維持管理方法。A manhole having an appropriate depth from the ground surface is provided at the upper end of a water passage that is filled with a filler in the vertical direction provided at a place where the underground water vein is divided by a retaining wall constructed continuously. In the interior of the water channel, the sewage discharge pipe is arranged so that the upper end faces the manhole and the bottom reaches the bottom of the water channel and the lower end is positioned in the upper layer of the water channel so as not to be adjacent to each other. The method for maintaining and managing the water vein in the underground retaining wall construction section is characterized in that pressure water is injected into the water passage from the washing water injection pipe to wash the inside of the water passage.
  2. 前記マンホール内において通水路の上端には開閉蓋を取り付けて、充填材の減少が認められたときには補充充填できるようにされている請求項1に記載の地下擁壁構築部における水脈の維持管理方法。The method for maintaining and managing a water vein in the underground retaining wall construction part according to claim 1, wherein an opening / closing lid is attached to the upper end of the water passage in the manhole so that refilling can be performed when a decrease in filler is observed. .
JP07915598A 1998-03-26 1998-03-26 Maintenance method of water vein in underground retaining wall construction section Expired - Fee Related JP3892576B2 (en)

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Application Number Priority Date Filing Date Title
JP07915598A JP3892576B2 (en) 1998-03-26 1998-03-26 Maintenance method of water vein in underground retaining wall construction section

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JP5320728B2 (en) * 2007-11-12 2013-10-23 株式会社大林組 Common well, construction method of regular well, and structure of regular well
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