JPS60246914A - Method of draining water in ground under excavation - Google Patents

Abstract

PURPOSE:To prevent soil from dropping in a soil reservoir located at the lowermost part of a deep well, by a method wherein, by the use of casing, processed so as to be served as a strainer, the deep well is formed, and a float cover for soil reservoir is located to the interior of the casing. CONSTITUTION:A support metal 7 is secured to the inner surface of a casing 2 which is formed such that a wire net 3 is wound around the outer surface of a steel pipe, processed so as to be served as a strainer through provision of slits 2a throughout the overall length. Further, a float cover 6 is placed on the metal 7, and a form 8 for holding a soil reservoir space is secured to the float cover 6. Thereafter, the casing 2 is inserted into a vertical hole 1, gravel 4 is charged into the vertical hole 1 therearound to fill it with the gravel. An underwater pump 5 is then placed on the form 8 and water is drained, resulting in lowering in a water level in a ground under excavation and deposition of soil in water on the float cover 6. This eliminates formation of a shallow sump at each excavation stage, and enables to perform a safe and efficient work.

Description

【発明の詳細な説明】 （産業上の利用分野） この発明は、土木建築工事において地下構造物を横築す
るために地盤を掘削する際に、雨水や湧出する地下水を
排水する方法に閃する。[Detailed Description of the Invention] (Industrial Application Field) The present invention is directed to a method for draining rainwater and gushing underground water when excavating the ground to horizontally construct an underground structure in civil engineering construction work. .

（従来の技術） 一般に掘削工事に先だってディープウェルを設けるが、
その始動は、最終根切底に近づいてからである。その間
ディープウェルのケーシングは邪魔にこそなれ役にたっ
ていなかった。(Conventional technology) Generally, a deep well is prepared before excavation work,
It starts only after approaching the final root. Meanwhile, the deep well casing was becoming more of a nuisance.

一方、各掘削段階においては、第４図に示すように排水
のために応急の釜揚を多数掘り下げねばならず、従って
これらに接続するホース等の排水管９が混雑し、安全上
好ましくないのみならず１、工事の障害になる欠点があ
った。On the other hand, at each excavation stage, as shown in Figure 4, it is necessary to dig a large number of emergency potholes for drainage, and therefore the drain pipes 9 such as hoses connected to them become congested, which is not desirable from a safety standpoint. First, there were drawbacks that could hinder construction work.

（発明が解決しようとする問題点） ディープウェルを各掘削段階において釜揚として使用す
ることが好ましいが、そうすると、最下部の砂溜り２ｂ
に土砂が溜り過ぎ、掘削完１後に使用するとき、本来の
役目を果さないので、最下部に土砂が溜らないようにし
なければならない。(Problem to be Solved by the Invention) It is preferable to use a deep well as a pothole in each excavation stage, but in that case, the bottom sand pool 2b
If too much earth and sand accumulates at the bottom, it will not fulfill its original role when used after excavation is completed, so it is necessary to prevent earth and sand from accumulating at the bottom.

（問題点を解決するための手段） 各掘ｒ４＋１段階において、ディープウェル内の中間部
に落し蓋を設置し、その上方においてポンプによる排水
を行う。必要があれば落し蓋の上面に砂溜り空間保持用
枠組を固定し、さらにはこの上面にエキスバンドメタル
等の網を張る。(Means for solving the problem) At each stage of excavation r4+1, a drop lid is installed in the middle part of the deep well, and drainage is performed using a pump above the lid. If necessary, a framework for holding the sand pool space is fixed on the top surface of the drop lid, and a net made of expanded metal or the like is placed on the top surface.

なお、落し蓋はケーシングの内面の所定深さ毎に固定し
た受け金物の上に載せ、下方に盛り替えるときは、落し
蓋を水平回転させ、その周囲にあらかじめ設けである切
欠きを受け金物に合致させながら落し蓋を下げる。In addition, the drop lid is placed on the receiving hardware fixed at each predetermined depth on the inner surface of the casing, and when repositioning downward, the drop lid is rotated horizontally and the notch provided in advance around it is aligned with the receiving hardware. While doing so, lower the lid.

（作用） ディープウェルを釜揚として兼用できる。周囲からスト
レーナ−を通して流入する水に含まれる土砂は落し蓋の
上に堆積し、ディープウェルの最下部の砂溜りに落下す
ることがない。(Function) The deep well can also be used as a kettle. Sediment contained in the water flowing in from the surrounding area through the strainer is deposited on the drop lid and does not fall into the sand pool at the bottom of the deep well.

（実施例） 第１図に示すようにアーストリル、さく井機等により穿
孔した整孔１白に、全長にスリット２ａをあけてストレ
ーナ−化した鋼管の外面に金網３を巻きつけたケーシン
グ２をｌ’ｉＴ１人し、その周囲の整孔内に砂利４を投
入、充填する。(Example) As shown in Fig. 1, a casing 2 is made by wrapping a wire mesh 3 around the outer surface of a steel pipe that has been made into a strainer by making a slit 2a along the entire length of the hole 1, which has been drilled using an earth drill or a well drilling machine. One person will put gravel 4 into the prepared hole around it and fill it.

ケーシング２の内面には所定４度毎に受け金物７が固定
されてあり、この上に落し蓋６を載せる。この落し蓋６
の上面に固定された砂溜り空間保持用枠組８の上に、水
中ポンプ５を載せ排水する。すると掘削中の地盤の水位
が低下し、同時に水中の土砂が落し蓋の上に沈積する。Receptacles 7 are fixed to the inner surface of the casing 2 at predetermined intervals of four degrees, and a drop lid 6 is placed on these. This drop lid 6
A submersible pump 5 is mounted on a framework 8 for holding a sand pool space fixed to the upper surface of the sand pool to drain water. As a result, the water level in the ground being excavated falls, and at the same time, submerged soil falls and deposits on top of the lid.

なお、この実施例では砂溜り空間保持用枠組の」二面に
エキスバンドメタル８ａを張り土砂の沈積を促進させて
いる。In this embodiment, expanded metal 8a is applied to two sides of the framework for holding the sand pool space to promote sedimentation of earth and sand.

図のように掘削地盤が落し蓋の深さより１〜２　ｍ　、
Ｊ：のレベルずなわち所定の中間掘削数面に達したら、
落し蓋６を下方に盛り替える。盛り替えは以下のように
行う。先ずポンプを引き揚げ、必要な場合には、ケーシ
ングの露出した部分を切断、除去する。次に落し蓋６を
その上面に固定された吊金物６ｂに係止したロープ（図
示せず。）により一旦掘削地盤上に吊り上げ、落し蓋６
の土に溜った土砂を取除く。そして落し蓋を再びディー
プウェル内に吊り下し、第２図に示す矢印の方向すなわ
ち周方向に調節しながら回転させ、落し蓋６の周囲にあ
らかじめ設けた切欠部６ａを受け金物７の位置に合致さ
せて以前に載っていたレベルを通過させ、さらにロープ
を繰出して下の段の受け金物に截せる。As shown in the figure, the excavated ground is 1 to 2 m below the depth of the drop cover.
When the level of J: is reached, that is, the predetermined intermediate excavation surface,
Replace the drop lid 6 downwards. Refilling is done as follows. First, the pump is salvaged and, if necessary, the exposed portion of the casing is cut and removed. Next, the drop lid 6 is temporarily lifted above the excavated ground using a rope (not shown) that is hooked to a hanging hardware 6b fixed to the upper surface of the drop lid 6.
Remove accumulated sediment from the soil. Then, the drop lid is suspended in the deep well again and rotated while adjusting in the direction of the arrow shown in FIG. The rope passes through the level it was on before, and then the rope is fed out and cut into the metal fittings on the lower level.

再びポンプをセットして次の掘削をする。これを第３図
のように繰り返す。Set the pump again and start the next excavation. Repeat this as shown in Figure 3.

（発明の効果） 各掘削段階において釜揚をなくすことにより工事を安全
にし能率化する。(Effects of the invention) Construction work is made safer and more efficient by eliminating pot lifting at each excavation stage.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の実施例を示す縦断面図であり、第２図
は第１図の■−■断面すなわち水平断面図である。 第３図は本発明方法の実施状態を示す説明図であって、
その（ａ）、（ｂ）、（ｃ）、（ｄ）は、それぞれ１次
掘削、２次掘削、３次掘削および最終掘削の状態を示す
。 第４図は従来のディープウェルおよび釜揚を示す縦断面
図である。 １・・・竪孔、２・・・ケーシング、２ａ・・・スリッ
ト、２ｂ・・最下部の砂溜り、３・・・金網、４・・砂
利、５・・・水中ポンプ、６・・・落し蓋、６ａ・・・
切欠部、６ｂ・・・吊金物、７・・・受は金物、８・・
・砂溜り空間保持用枠組、８ａ・・・エキスバンドメタ
ル、９・排水管 特許出願人　株式会社大林組 代理人　安斉佑− 第１図 第２図FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a horizontal sectional view taken along the line 1--2 of FIG. FIG. 3 is an explanatory diagram showing the implementation state of the method of the present invention,
(a), (b), (c), and (d) show the states of primary excavation, secondary excavation, tertiary excavation, and final excavation, respectively. FIG. 4 is a vertical cross-sectional view showing a conventional deep well and a kettle. 1... Pit, 2... Casing, 2a... Slit, 2b... Bottom sand pool, 3... Wire mesh, 4... Gravel, 5... Submersible pump, 6... Drop lid, 6a...
Notch, 6b... Hanging hardware, 7... Holder is hardware, 8...
・Framework for holding sand pool space, 8a...Expanded metal, 9・Drain pipe Patent applicant: Representative of Obayashi Co., Ltd., Yasushi Yasu - Figure 1 Figure 2

Claims (3)

【特許請求の範囲】[Claims] （１）はぼ全長をストレーナ−化したケーシングを用い
てディープウェルを設置し、その周囲の地盤を掘削する
に際し、前記ケーシング、の内部の中間部に砂溜り用落
し蓋を設置して、砂溜り用空間を保持した軟融でその上
部から排水することを特徴とする掘削中の地盤における
排水方法。(1) A deep well is installed using a casing whose entire length is made into a strainer, and when excavating the ground around the deep well, a sand trap cover is installed in the middle part of the inside of the casing, and a sand trap is removed. A drainage method for the ground during excavation, which is characterized by draining water from the upper part of the ground using soft melt while retaining the space. （２）砂溜り用落し蓋が、ケーシングの内部の所定位置
に設けた受け金物に載置可能であって、かつ、その周囲
に適宜に周方向に回転したときに前記受は金物に合致す
る切欠きをイｒする円板である特許請求の範囲第１項に
記載の掘削中の地盤における排水方法。(2) The drop lid for the sand basin can be placed on a receiving metal fitting provided at a predetermined position inside the casing, and when the sand basin drop lid is rotated in an appropriate circumferential direction around the casing, the said receiving plate is cut into a shape that matches the metal fitting. 2. The method of draining water in the ground during excavation according to claim 1, which is a disc that eliminates chips. （３）砂溜り用空間を保持する手段が、落し蓋の４−面
に固定した砂溜り空間保持用枠組によるものである特許
請求の範囲第１項または第２項に記載の掘削中の地盤に
おける排水方法。(3) In the ground during excavation according to claim 1 or 2, wherein the means for holding the sand pool space is a framework for holding the sand pool space fixed to the four sides of the drop lid. Drainage method.