JP5658177B2 - Ground improvement method - Google Patents

Ground improvement method Download PDF

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JP5658177B2
JP5658177B2 JP2012004763A JP2012004763A JP5658177B2 JP 5658177 B2 JP5658177 B2 JP 5658177B2 JP 2012004763 A JP2012004763 A JP 2012004763A JP 2012004763 A JP2012004763 A JP 2012004763A JP 5658177 B2 JP5658177 B2 JP 5658177B2
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well
pump
water
pumping
ground
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JP2013144871A (en
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高橋　茂吉
茂吉 高橋
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Asahi Techno Corp
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Description

本発明は、ＳＷＰによる軟弱地盤の改良工法に関する。   The present invention relates to a method for improving soft ground by SWP.

本出願人は特許文献１において地盤の改良工法を提案した。
この工法は、ＳＷＰ（スーパーウェルポイント）を用いて飽和地下水を負圧伝播で揚水することで、主に目的のエリアのみ集中してスポット的に水位低下が望め不飽和ゾーンを作り出す。その後、ＳＷＰのバキユームポンプや、ボルテックスポンプを用いて、不飽和ゾーンの範囲で真空気化を促進して水分の除去やＶＯＣｓ（揮発性有機化合物）、油分など気化性のものを地中から除去し、地盤改良や土壌浄化を進める。 The present applicant has proposed a ground improvement method in Patent Document 1.
In this construction method, the saturated groundwater is pumped up by negative pressure propagation using SWP (Super Well Point), so that only the target area is concentrated and the water level can be lowered spotwise to create an unsaturated zone. After that, using a SWP vacuum pump or vortex pump, it promotes vacuum vaporization in the range of the unsaturated zone to remove moisture, VOCs (volatile organic compounds), and vaporizable substances such as oil from the ground. And promote ground improvement and soil purification.

特開２００７−３０３０９５（特許第４１１４９４４号）公報JP2007-303095 (Patent No. 4114944)

本発明の課題は、ＳＷＰで飽和地下水を効率よく負圧伝播で揚水して、確実に水位低下できるようにすることである。   An object of the present invention is to pump saturated groundwater efficiently by negative pressure propagation with SWP so that the water level can be reliably lowered.

以上の課題を解決するため、請求項１に記載の発明は、
地盤に井戸を設置し、その井戸から下部のストレーナを介して地中の水と空気を吸引する地盤の改良工法であって、
前記井戸の下部に配置され、前記ストレーナを介して前記地中の水と空気を吸引する揚水ポンプとして、前記井戸の吸水能力より大きい揚水能力のポンプを用いた前記井戸内の水の揚水と、バキュームを用いた前記井戸内の空気の排出と、を行うことを特徴とする。 In order to solve the above problems, the invention described in claim 1
It is a ground improvement method that installs a well in the ground and sucks underground water and air from the well through the lower strainer,
Pumping water in the well using a pump with a pumping capacity larger than the water-absorbing capacity of the well as a pumping pump that is disposed in the lower part of the well and sucks the water and air in the ground through the strainer ; And discharging the air in the well using a vacuum .

請求項２に記載の発明は、
請求項１に記載の地盤の改良工法であって、
前記揚水ポンプを用いた揚水によって前記井戸内の水位を前記揚水ポンプの吸水口まで低下させることを特徴とする。 The invention described in claim 2
The ground improvement method according to claim 1,
The water level in the well is lowered to the water inlet of the pump by pumping using the pump .

本発明によれば、ＳＷＰで飽和地下水を効率よく負圧伝播で揚水して、確実に水位低下させることができる。   ADVANTAGE OF THE INVENTION According to this invention, saturated groundwater can be efficiently pumped by negative pressure propagation with SWP, and a water level can be reduced reliably.

本発明を適用した実施形態の工法を示す断面図である。It is sectional drawing which shows the construction method of embodiment to which this invention is applied.

以下、図を参照して本発明を実施するための形態を詳細に説明する。
（実施形態）
図１は本発明を適用した実施形態の工法を示すもので、１は井戸、２はストレーナ、３は揚水ポンプ、４は内管、５は揚水管、６はバキュームポンプ、７は吸引管である。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
(Embodiment)
FIG. 1 shows a construction method according to an embodiment to which the present invention is applied. 1 is a well, 2 is a strainer, 3 is a pump, 4 is an inner pipe, 5 is a pump, 6 is a vacuum pump, and 7 is a suction pipe. is there.

図示のように、対象地盤には、ＳＷＰによる井戸１が設置されている。   As shown in the figure, a well 1 made of SWP is installed on the target ground.

井戸１には、その底部に設置された揚水ポンプ３に接続した内管４に地上の揚水管５が接続されるとともに、地上のバキュームポンプ６に接続した吸引管７が接続されている。
この井戸１には、揚水ポンプ３とバキュームポンプ６により、下部のストレーナ２を介して地中の水と空気が吸引される。 The well 1 is connected to a ground pumping pipe 5 connected to an inner pipe 4 connected to a pumping pump 3 installed at the bottom thereof, and is connected to a suction pipe 7 connected to a ground vacuum pump 6.
Water and air in the ground are sucked into the well 1 by the pumping pump 3 and the vacuum pump 6 through the lower strainer 2.

そして、ストレーナ２を介して井戸１に吸引された水とその中の気泡は、揚水ポンプ３により吸引されて、内管４を通り、地上の揚水管５に揚水されて、図示しない貯水槽等に排出される。
また、井戸１の水の上方の空気は、バキュームポンプ６により吸引されて、吸引管７を通して地上の大気中に排出される。 Then, the water sucked into the well 1 through the strainer 2 and the air bubbles therein are sucked by the pumping pump 3, passed through the inner pipe 4, and pumped up to the ground pumping pipe 5, and a water tank (not shown) or the like. To be discharged.
Further, the air above the water in the well 1 is sucked by the vacuum pump 6 and discharged into the ground atmosphere through the suction pipe 7.

ここで、揚水ポンプ３としては、井戸に入り込む湧水量（吸水量）よりも揚水能力の大きいポンプを用いる。
すなわち、井戸１の吸水量がＱ1＝１．０ｍ3／ｍｉｎならば、ポンプは揚水能力の大きいＱ2＝２．０ｍ3／ｍｉｎのポンプを用いる。
これにより、井戸１の井戸内水位はポンプ吸水口まで低下していて、井戸外の地下水に負圧伝播で揚水することができる。 Here, as the pumping pump 3, a pump having a larger pumping capacity than the amount of spring water (water absorption amount) entering the well is used.
That is, if the water absorption amount of the well 1 is Q1 = 1.0 m 3 / min, the pump having a large pumping capacity Q2 = 2.0 m 3 / min is used.
Thereby, the water level in the well of the well 1 is lowered to the pump suction port and can be pumped to the groundwater outside the well by negative pressure propagation.

以上、実施形態によれば、ＳＷＰによる井戸１の吸水量Ｑ1より大きい揚水能力Ｑ2（Ｑ1＜Ｑ2）の揚水ポンプ３を用いることで、ＳＷＰで飽和地下水を効率よく負圧伝播で揚水して、確実に水位低下させることができる。   As described above, according to the embodiment, by using the pump 3 having the pumping capacity Q2 (Q1 <Q2) larger than the water absorption amount Q1 of the well 1 by SWP, the saturated groundwater is efficiently pumped by the negative pressure propagation by the SWP. The water level can be reliably lowered.

１ 揚水吸気用の井戸
２ ストレーナ
３ 揚水ポンプ
４ 内管
５ 揚水管
６ バキュームポンプ
７ 吸引管 DESCRIPTION OF SYMBOLS 1 Well for pumping intake 2 Strainer 3 Pumping pump 4 Inner pipe 5 Pumping pipe 6 Vacuum pump 7 Suction pipe

Claims (2)

地盤に井戸を設置し、その井戸から下部のストレーナを介して地中の水と空気を吸引する地盤の改良工法であって、
前記井戸の下部に配置され、前記ストレーナを介して前記地中の水と空気を吸引する揚水ポンプとして、前記井戸の吸水能力より大きい揚水能力のポンプを用いた前記井戸内の水の揚水と、バキュームを用いた前記井戸内の空気の排出と、を行うことを特徴とする地盤の改良工法。 It is a ground improvement method that installs a well in the ground and sucks underground water and air from the well through the lower strainer,
Pumping water in the well using a pump with a pumping capacity larger than the water-absorbing capacity of the well as a pumping pump that is disposed in the lower part of the well and sucks the water and air in the ground through the strainer ; An improvement method of the ground, characterized in that the air in the well is discharged using a vacuum . 前記揚水ポンプを用いた揚水によって前記井戸内の水位を前記揚水ポンプの吸水口まで低下させることを特徴とする請求項１に記載の地盤の改良工法。 The ground improvement method according to claim 1, wherein the water level in the well is lowered to a water intake port of the pump by pumping using the pump .
JP2012004763A 2012-01-13 2012-01-13 Ground improvement method Active JP5658177B2 (en)

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JP6622502B2 (en) * 2015-07-30 2019-12-18 東洋建設株式会社 Subsurface groundwater suction device, method for reducing the volume of mud and sludge in the bottom, methane hydrate recovery device and method in seabed

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JP3243501B2 (en) * 1998-05-01 2002-01-07 西松建設株式会社 Groundwater level lowering device, ground improvement method, and strainer device
JP4114944B2 (en) * 2006-05-09 2008-07-09 有限会社アサヒテクノ Ground improvement method

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