JPH04126B2 - - Google Patents
Info
- Publication number
- JPH04126B2 JPH04126B2 JP5355585A JP5355585A JPH04126B2 JP H04126 B2 JPH04126 B2 JP H04126B2 JP 5355585 A JP5355585 A JP 5355585A JP 5355585 A JP5355585 A JP 5355585A JP H04126 B2 JPH04126 B2 JP H04126B2
- Authority
- JP
- Japan
- Prior art keywords
- partition member
- pipe
- strainer casing
- cleaning pipe
- cleaning
- 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.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 71
- 238000005192 partition Methods 0.000 claims description 39
- 238000004140 cleaning Methods 0.000 claims description 35
- 239000003673 groundwater Substances 0.000 claims description 27
- 238000010276 construction Methods 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 2
- 230000005494 condensation Effects 0.000 description 8
- 238000009833 condensation Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、大規模な地下室を有する建築物の地
下工事等に利用される排水工法の１つである深井
戸（デイープウエル）を用いた還元井戸（リチヤ
ージウエル）工法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention uses a deep well, which is one of the drainage construction methods used for underground construction of buildings with large basements. Regarding the reduction well (recharge well) construction method.
一般に、深井戸によつて揚水した地下水は、下
水道に放流されるので、放流可能量が揚水量より
も少ない場合には、目標にした深さまで水位ある
いは水頭を降下させることができず、従つて、計
画深度までの掘削が困難になる。
Generally, groundwater pumped up by deep wells is discharged into the sewer system, so if the amount of water that can be discharged is less than the amount of water pumped, the water level or water head cannot be lowered to the target depth, and therefore , it becomes difficult to excavate to the planned depth.
また、揚水した水を全量放流できる場合であつ
ても、近年では、地方自治体の徴収する下水放流
負担金が高騰しており、膨大な額となることがあ
る。 Furthermore, even if all the pumped water can be discharged, in recent years, the sewage discharge burden collected by local governments has soared, and the amount can become enormous.
このため、最近では、下水への放流費用を低減
するため、一旦揚水した地下水を工事に影響のな
い帯水層へ返す手法として、所謂還元井戸工法が
試みられている。 For this reason, recently, in order to reduce the cost of discharging into sewage, a so-called return well construction method has been attempted as a method of returning pumped groundwater to an aquifer where it will not affect construction work.
この還元井戸工法は、第７図に示すように、排
水対象とする帯水層（砂質土層）Ａの地下水を深
井戸工法により揚水（排水）し、この水の全部又
は一部を還元（復水）用の深井戸を用いて、不透
水層ａの下方に位置する工事に影響のない帯水層
Ｂへと還元（復水）する方法である。同図中の
１′は地中連続壁等による山止め壁、８′は揚水用
深井戸のストレーナーケーシング、８″は還元用
深井戸のストレーナーケーシング、１２′は砂利
等によるフイル材、１３′は遮水モルタルによる
外部パツカー、１４′は揚水用の水中ポンプ、１
６′は揚水用管、５′は復水用管、１５′は地上に
設置された水槽である。 As shown in Figure 7, this reduction well construction method involves pumping up (draining) groundwater from an aquifer (sandy soil layer) A to be drained using a deep well construction method, and then returning all or part of this water. This method uses a deep well (for condensation) to return (condensate) water to aquifer B, which is located below impermeable layer A and does not affect construction work. In the figure, 1' is a retaining wall such as an underground continuous wall, 8' is a strainer casing for a deep water pumping well, 8'' is a strainer casing for a deep reduction well, 12' is a film material made of gravel, etc., and 13'14' is a submersible pump for water pumping, 1
6' is a pumping pipe, 5' is a condensate pipe, and 15' is a water tank installed on the ground.
上記の還元井戸工法は、揚水した地下水を別の
帯水層に返すため、下水への放流量を減少し得る
ものであるが、上記の通り、揚水用の深井戸と還
元用の深井戸とを設置しているため、深井戸の設
置費用が嵩み、工期も長くなるという問題点があ
る。
The above-mentioned reinjection well method returns the pumped groundwater to another aquifer, thereby reducing the amount of water discharged into the sewage system. Since deep wells are installed, there are problems in that the cost of installing deep wells increases and the construction period becomes longer.
また揚水用深井戸から水中ポンプで揚水された
地下水は泥水かそれに近い状態にあるので普通で
あり、しかも地下水が揚水され、大気に触れると
地下水の鉄分に錆が発生しやすく、従つて、これ
を復水すると還元用深井戸のストレーナーケーシ
ングが次第に目詰まりを起こし、時間の経過と共
に復水能力が低下するという問題点がある。 In addition, groundwater pumped from a deep well for pumping by a submersible pump is normal because it is in a state close to muddy water. Moreover, when groundwater is pumped up and comes into contact with the atmosphere, the iron content in the groundwater tends to rust. There is a problem in that when water is condensed, the strainer casing of the deep reinjection well gradually becomes clogged, and the condensation capacity decreases over time.
本発明による還元井戸工法は、上記の問題点を
解決するため、不透水層の上下に位置する帯水層
にわたつて縦孔を掘削し、縦孔内に、上下両帯水
層に対応する位置に通水孔が形成され、前記不透
水層に対応する位置に内部を上下に仕切る仕切部
材が設けられ、該仕切部材には復水用管及び洗浄
用管が貫通した状態に設けられたストレーナーケ
ーシングを挿入し、ストレーナーケーシングと孔
壁との間には、前記両帯水層に対応する位置に砂
利等のフイルター材を充填すると共に前記不透水
層に対応する位置に薬液注入等による外部パツカ
ーを形成し、前記ストレーナーケーシングの内部
には、前記仕切部材の上方に水中ポンプを挿入
し、該水中ポンプで排水した上部帯水層の地下水
を前記復水用管を通して仕切部材下方のストレー
ナーケーシング内部に注入し、洗浄時には、前記
注入を停止した状態において、前記洗浄用管を介
して仕切部材下方のストレーナーケーシング内部
の地下水を地上に汲み上げることにより、下部帯
水層の地下水で仕切部材下方のストレーナーケー
シングを逆洗するようにしたものである。
In order to solve the above-mentioned problems, the reduction well construction method according to the present invention excavates a vertical hole across the aquifer located above and below the impermeable layer, and in the vertical hole, corresponds to both the upper and lower aquifers. A water passage hole is formed at a position, a partition member is provided at a position corresponding to the impermeable layer to partition the interior into upper and lower parts, and a condensate pipe and a cleaning pipe are provided through the partition member. A strainer casing is inserted, and between the strainer casing and the hole wall, a filter material such as gravel is filled in the positions corresponding to both aquifers, and an external material such as chemical liquid is injected into the position corresponding to the impermeable layer. A submersible pump is inserted into the strainer casing above the partition member, and groundwater from the upper aquifer drained by the submersible pump is passed through the condensate pipe to the strainer casing below the partition member. During cleaning, the groundwater inside the strainer casing below the partition member is pumped up to the ground level through the cleaning pipe with the injection stopped, so that the groundwater below the partition member is pumped with groundwater from the lower aquifer. This is designed to backwash the strainer casing.
以下、本発明の実施例を図面に基づいて説明す
る。
Embodiments of the present invention will be described below based on the drawings.
第１図に示すように、地中連続壁等の山止め壁
１の内側を掘削し、不透水層ａの上下に位置する
帯水層Ａ，Ｂにわたつて縦孔２を形成する。Pa
は上部帯水層Ａの自由地下水面、Pbは下部帯水
層Ｂの被圧水位を示す。 As shown in FIG. 1, the inside of a retaining wall 1 such as an underground continuous wall is excavated to form a vertical hole 2 across aquifers A and B located above and below an impermeable layer a. Pa
Pb indicates the free groundwater level of the upper aquifer A, and Pb indicates the pressurized water level of the lower aquifer B.
次に、第２図に示すように、縦孔２内に、上下
両帯水層Ａ，Ｂに対応する位置に通水孔３が形成
され、前記不透水層ａに対応する位置に内部を上
下に仕切る鉄板よりなる仕切部材４が固着され、
該仕切部材４には復水用管５と洗浄用管６と該洗
浄用管６の長手方向適当位置に接続された空気供
給管７とが貫通した状態に取り付けられたストレ
ーナーケーシング８を挿入する。前記復水用管５
の下端開口部は前記仕切部材４の近くに配置さ
れ、前記洗浄用管６の下端開口部はストレーナー
ケーシング８の底部に溜る泥を排出できるように
ストレーナーケーシング８の底部近くに配置され
ている。 Next, as shown in FIG. 2, a water passage hole 3 is formed in the vertical hole 2 at a position corresponding to both the upper and lower aquifers A and B, and an internal hole is formed at a position corresponding to the impermeable layer a. A partition member 4 made of an iron plate that partitions the upper and lower parts is fixed,
A strainer casing 8 is inserted into the partition member 4 so that a condensate pipe 5, a cleaning pipe 6, and an air supply pipe 7 connected to an appropriate position in the longitudinal direction of the cleaning pipe 6 penetrate through the strainer casing 8. . Said condensate pipe 5
The lower end opening is disposed near the partition member 4, and the lower end opening of the cleaning tube 6 is disposed near the bottom of the strainer casing 8 so that mud accumulated at the bottom of the strainer casing 8 can be discharged.
前記洗浄用管６の上端開口部は下部帯水層Ｂの
被圧水位Pbよりも下方に配置されており、且つ
当該上端開口部にはバタフライ弁等の弁Ｖが設け
られ、該弁Ｖは地上でハンドル１０を回転操作す
ることにより操作軸１１を介して開閉できるよう
に構成されている。 The upper end opening of the cleaning pipe 6 is arranged below the pressurized water level Pb of the lower aquifer B, and the upper end opening is provided with a valve V such as a butterfly valve. It is configured so that it can be opened and closed via an operating shaft 11 by rotating a handle 10 on the ground.
前記ストレーナーケーシング８のうち、上部縦
孔部分２ａに挿入される部分８ａは下部縦孔部分
２ｂに挿入される部分８ｂよりも直径を大きくし
てある。具体的には前者８ａの直径は約800mm、
後者８ｂの直径は約600mmに設定されている。図
示しないが、ストレーナーケーシング８の外周に
は、前記通水孔３を形成した部分に網が巻き付け
固着され、土砂の流入を防止すべく構成されてい
る。 Of the strainer casing 8, a portion 8a inserted into the upper vertical hole portion 2a has a larger diameter than a portion 8b inserted into the lower vertical hole portion 2b. Specifically, the diameter of the former 8a is approximately 800 mm,
The diameter of the latter 8b is set to approximately 600 mm. Although not shown, a net is wrapped around and fixed to the outer periphery of the strainer casing 8 around the portion where the water passage hole 3 is formed, so as to prevent the inflow of earth and sand.
しかる後、第３図に示すように、ストレーナー
ケーシング８と孔壁との間には、砂利等のフイル
ター部材１２を充填すると共に前記不透水層ａに
対応する位置に薬液注入（例えば、水ガラス及び
セメントを主成分とする既知の注入用薬液を使用
する。）又はセメントモルタルの打設を行つて、
上下の帯水層Ａ，Ｂを仕切る外部パツカー１３を
形成し、両帯水層Ａ，Ｂに対応する位置に充填さ
れた前記フイルター部材１２により透水性を確保
すると共に土砂の流入を防止すべく構成する。 Thereafter, as shown in FIG. 3, a filter member 12 such as gravel is filled between the strainer casing 8 and the hole wall, and a chemical solution (for example, water glass) is injected into a position corresponding to the impermeable layer a. and using known injection chemicals containing cement as the main component) or by placing cement mortar,
An external packer 13 is formed to partition the upper and lower aquifers A and B, and the filter members 12 filled in positions corresponding to both aquifers A and B ensure water permeability and prevent the inflow of earth and sand. Configure.
しかる後、あるいはそれまでの適当な時期に、
第４図に示すように、前記ストレーナーケーシン
グ８の内部に、水中ポンプ１４を挿入し、地上に
は水槽１５を設置して、該水槽１５に水中ポンプ
１４からの揚水用管１６の上端開口部と前記復水
用管５の上端開口部とを臨ませる。１７は復水用
管５に接続された送水ポンプである。 After that, or at an appropriate time before then,
As shown in FIG. 4, a submersible pump 14 is inserted into the strainer casing 8, a water tank 15 is installed on the ground, and an upper end opening of a water pumping pipe 16 from the submersible pump 14 is connected to the water tank 15. and the upper end opening of the condensate pipe 5 are faced. 17 is a water pump connected to the condensate pipe 5.
そして、前記弁Ｖを閉じた状態で前記水中ポン
プ１４を稼動して上部帯水層Ａの排水を行い、上
部帯水層Ａの水位Paを所望位置まで降下させる
一方、水中ポンプ１４で排水した上部帯水層Ａの
地下水を前記水槽１５に供給し、該水槽１５で砂
を沈澱分離した後、この地下水の全部又は一部を
前記復水用管５を通して下部帯水層Ｂに復水（還
元）するのである。尚、水中ポンプ１４下のスペ
ース及びストレーナーケーシング８の下端部は
夫々泥溜めとなる。 Then, with the valve V closed, the submersible pump 14 was operated to drain the upper aquifer A, and while the water level Pa of the upper aquifer A was lowered to a desired position, the submersible pump 14 was used to drain the water. After supplying the groundwater of the upper aquifer A to the water tank 15 and precipitating and separating sand in the water tank 15, all or part of this groundwater is condensed ( (reduction). Note that the space below the submersible pump 14 and the lower end of the strainer casing 8 each serve as a mud reservoir.
ところで、この実施例では、下部帯水層Ｂへの
復水を、重力方式、つまり前記水槽１５と下部帯
水層Ｂの被圧水位Pbとの水位差（水圧差）によ
つて行つており、前記送水ポンプ１７は復水の開
始時にのみ稼動される。即ち、復水用管５内に空
気があつて前記水位差（水圧差）のみによつては
復水がスムーズに開始されない場合、復水の開始
時にのみ前記送水ポンプ１７を稼動して水槽１５
内の地下水を短時間圧送し、復水用管５内の空気
を追い出すのである。かくすれば、それ以後、送
水ポンプ１７を停止しても、前記水位差による復
水がスムーズに行われるのである。この場合、第
３図及び第４図に仮想線で示すように、予め、仕
切部材４を貫通する空気抜き管１８を設けてお
き、この空気抜き管１８を用いて仕切部材４の下
方に溜る空気を抜くことにより、前記復水が一層
効果的に行われる。 By the way, in this embodiment, water is condensed into the lower aquifer B by gravity, that is, by the water level difference (water pressure difference) between the water tank 15 and the pressurized water level Pb of the lower aquifer B. , the water pump 17 is operated only at the start of condensation. That is, if there is air in the condensate pipe 5 and condensation cannot be started smoothly only by the water level difference (water pressure difference), the water pump 17 is operated only when condensation starts.
The air inside the condensate pipe 5 is expelled by force-feeding the groundwater inside the condensate pipe 5 for a short period of time. In this way, even if the water pump 17 is stopped thereafter, water can be smoothly condensed due to the water level difference. In this case, as shown by the imaginary lines in FIGS. 3 and 4, an air vent pipe 18 passing through the partition member 4 is provided in advance, and this air vent pipe 18 is used to remove the air accumulated below the partition member 4. By removing the water, the condensation can be carried out more effectively.
送水ポンプ１７としては停止状態において水の
流通を妨げないものを使用しているが、プランジ
ヤーポンプのように作動を停止した状態において
水の流通の妨げとなるポンプを送水ポンプ１７と
して使用する場合であれば、送水ポンプ１７の停
止後、前記水位差による復水を行うためには、逆
止弁を有するバイパスを設け、このバイパスを通
して復水すべく構成することが望ましい。 As the water pump 17, a pump that does not obstruct the flow of water when in a stopped state is used, but when a pump such as a plunger pump that obstructs the flow of water when its operation is stopped is used as the water pump 17. In this case, in order to condense water based on the water level difference after the water pump 17 is stopped, it is desirable to provide a bypass having a check valve and to condense water through this bypass.
尚、下部帯水層Ｂへの復水を加圧方式、つまり
前記送水ポンプ１７の吐出圧力によつて強制的に
行つてもよい。 Note that the condensation to the lower aquifer B may be forcibly performed by a pressurizing method, that is, by the discharge pressure of the water pump 17.
仕切部材４下方のストレーナーケーシング８ｂ
の目詰まりにより、復水能力が或る程度低下して
きたら、あるいは定期的に前記ストレーナーケー
シング８ｂの洗浄を行う。即ち、第５図に示すよ
うに、復水用管５に介装された弁V5を操作して
復水用管５を閉めきることにより復水を停止する
と共に、地上からの操作で前記洗浄用管６の弁Ｖ
を開く。次いで、予め適当な時点で前記空気供給
管７に接続してあるコンプレツサー９を稼動し、
空気供給管７から洗浄用管６へと空気を供給す
る。これにより、仕切部材４下方のストレーナー
ケーシング８ｂ内部の地下水は、被圧水位Pbと
洗浄用管６の上端開口部との水位差（水圧差）
と、空気供給管７から洗浄用管６への空気供給に
より生じるエアリフトとによつて、仕切部材４上
方のストレーナーケーシング８ａ内へと汲み上げ
られ、前記水中ポンプ１４により地上へと汲み上
げられる。従つて、下部帯水層Ｂの地下水が仕切
部材４下方のストレーナーケーシング８ｂ内部へ
と流入し、当該ストレーナーケーシング８ｂの逆
洗が行われることになる。 Strainer casing 8b below partition member 4
The strainer casing 8b is cleaned when the condensing capacity decreases to some extent due to clogging, or periodically. That is, as shown in FIG. 5, the condensate is stopped by operating the valve V5 installed in the condensate pipe 5 to completely close the condensate pipe 5, and the above-mentioned operation is performed from the ground. Valve V of cleaning pipe 6
open. Next, at an appropriate point in time, the compressor 9 connected to the air supply pipe 7 is operated,
Air is supplied from the air supply pipe 7 to the cleaning pipe 6. As a result, the groundwater inside the strainer casing 8b below the partition member 4 is controlled by the water level difference (water pressure difference) between the pressurized water level Pb and the upper end opening of the cleaning pipe 6.
The air is pumped up into the strainer casing 8a above the partition member 4 by the air lift generated by the air supply from the air supply pipe 7 to the cleaning pipe 6, and then pumped to the ground by the submersible pump 14. Therefore, the groundwater in the lower aquifer B flows into the strainer casing 8b below the partition member 4, and the strainer casing 8b is backwashed.
上記の実施例では、洗浄効果を高めるため、エ
アリフトを併用しているが、下部帯水層Ｂの被圧
水位Pbと洗浄用管６の上端開口部との水位差が
十分に大きければ、エアリフトのための構成を省
略し、洗浄時に、前記水位差のみによつて仕切部
材４下方のストレーナーケーシング８ｂ内部の地
下水を仕切部材４上方のストレーナーケーシング
８ａ内へと汲み上げるようにしてもよい。 In the above embodiment, an air lift is also used to enhance the cleaning effect. The configuration for this may be omitted, and the groundwater inside the strainer casing 8b below the partition member 4 may be pumped up into the strainer casing 8a above the partition member 4 only by the water level difference during cleaning.
第６図は別の実施例を示す。この実施例は、洗
浄用管６の上端開口部を下部帯水層Ｂの被圧水位
Pbよりも上方に位置させ、好ましくは、図示の
通り、地上に位置させ、洗浄時には、空気供給管
７から洗浄用管６への空気供給により生じるエア
リフトによつて仕切部材４下方のストレーナーケ
ーシング８ｂ内部の地下水を、一旦仕切部材４上
方のストレーナーケーシング８ａ内に汲み上げた
後、揚水用の水中ポンプ１４を介して地上まで汲
み上げるか、あるいは、図示の通り、地上まで直
接的に汲み上げるようにし、もつて前述した弁Ｖ
及びその操作用ハンドル１０、操作軸１１等を省
略した点に特徴がある。 FIG. 6 shows another embodiment. In this embodiment, the upper end opening of the cleaning pipe 6 is connected to the pressurized water level of the lower aquifer B.
Strainer casing 8b is located above Pb, preferably on the ground as shown in the figure, and during cleaning, the air lift generated by the air supply from the air supply pipe 7 to the cleaning pipe 6 is applied to the strainer casing 8b below the partition member 4. After the internal groundwater is once pumped into the strainer casing 8a above the partition member 4, it is pumped up to the ground via the submersible pump 14 for pumping water, or as shown in the figure, it is pumped directly to the ground. The valve V mentioned above
It is also characterized by omitting the operating handle 10, operating shaft 11, etc.
本発明は、上述した構成よりなり、排水対象地
盤である上部帯水層から揚水した地下水を地下工
事に影響のない下部帯水層へ復水して、下水道へ
の放流量を低減することによるコストダウンが可
能であるばかりでなく、１本の深井戸の上部側が
揚水用深井戸に、下部側か復水用の還元井に構成
されているので、深井戸の設置費用の低減による
大幅なコストダウンと工期短縮が可能である。
The present invention has the above-mentioned configuration, and condenses groundwater pumped from the upper aquifer, which is the ground to be drained, to the lower aquifer, which does not affect underground construction, thereby reducing the amount of water discharged into the sewer. Not only is it possible to reduce costs, but the upper side of a single deep well is configured as a pumping deep well, and the lower side is configured as a reinjection well for condensate, resulting in a significant reduction in installation costs for deep wells. It is possible to reduce costs and shorten the construction period.
しかも、適時、仕切部材下方のストレーナーケ
ーシング内部への注水、つまり下部帯水層への復
水を停止し、前記洗浄用管を介して仕切部材下方
のストレーナーケーシング内部の地下水を地上に
汲み上げることにより、下部帯水層の地下水で前
記仕切部材下方のストレーナーケーシングを逆洗
するため、目詰まりによる復水能力の低下を抑制
できる効果がある。 Moreover, by stopping water injection into the inside of the strainer casing below the partition member, that is, stopping water condensation to the lower aquifer, at an appropriate time, and pumping the groundwater inside the strainer casing below the partition member to the ground through the cleaning pipe. Since the strainer casing below the partition member is backwashed with groundwater from the lower aquifer, there is an effect of suppressing a decrease in condensate capacity due to clogging.
第１図乃至第５図は本発明の実施例を示す断面
図である。第６図は本発明の別実施例を示す断面
図である。第７図は従来例を示す断面図である。
Ａ，Ｂ……帯水層、ａ……不透水層、２……縦
孔、３……通水孔、４……仕切部材、５……復水
用管、６……洗浄用管、７……空気供給管、８…
…ストレーナーケーシング、１２……フイルター
部材、１３……外部パツカー、１４……水中ポン
プ、１６……揚水用管。
1 to 5 are cross-sectional views showing embodiments of the present invention. FIG. 6 is a sectional view showing another embodiment of the present invention. FIG. 7 is a sectional view showing a conventional example. A, B... Aquifer, a... Impermeable layer, 2... Vertical hole, 3... Water passage hole, 4... Partition member, 5... Condensate pipe, 6... Cleaning pipe, 7...Air supply pipe, 8...
... Strainer casing, 12 ... Filter member, 13 ... External packer, 14 ... Submersible pump, 16 ... Water pumping pipe.
Claims (1)
縦孔を掘削し、縦孔内に、上下両帯水層に対応す
る位置に通水孔が形成され、前記不透水層に対応
する位置に内部を上下に仕切る仕切部材が設けら
れ、該仕切部材には復水用管及び洗浄用管が貫通
した状態に設けられたストレーナーケーシングを
挿入し、ストレーナーケーシングと孔壁との間に
は、前記両帯水層に対応する位置に砂利等のフイ
ルター材を充填すると共に前記不透水層に対応す
る位置に薬液注入等による外部パツカーを形成
し、前記ストレーナーケーシングの内部には、前
記仕切部材の上方に水中ポンプを挿入し、該水中
ポンプで排水した上部帯水層の地下水を前記復水
用管を通して仕切部材下方のストレーナーケーシ
ング内部に注入し、洗浄時には、前記注入を停止
した状態において、前記洗浄用管を介して仕切部
材下方のストレーナーケーシング内部の地下水を
地上に汲み上げることにより、下部帯水層の地下
水で仕切部材下方のストレーナーケーシングを逆
洗することを特徴とする還元井戸工法。 ２ 前記洗浄用管の上端開口部を下部帯水層の被
圧水位よりも下方に位置させ、該洗浄用管に地上
からの操作によつて開閉する弁を設け、洗浄時
に、下部帯水層の被圧水位と洗浄用管の上端開口
部との水位差によつて仕切部材下方のストレーナ
ーケーシング内部の地下水を仕切部材上方のスト
レーナーケーシング内部に汲み上げ、前記水中ポ
ンプにより地上に汲み上げることを特徴とする特
許請求の範囲第１項に記載の還元井戸工法。 ３ 前記洗浄用管の上端開口部を下部帯水層の被
圧水位よりも下方に位置させ、該洗浄用管に地上
からの操作によつて開閉する弁を設けると共に、
該洗浄用管の長手方向適当位置に空気供給管を接
続し、洗浄時に、下部帯水層の被圧水位と洗浄用
管の上端開口部との水位差と、前記空気供給管か
ら洗浄用管への空気供給により生じるエアリフト
とによつて仕切部材下方のストレーナーケーシン
グ内部の地下水を仕切部材上方のストレーナーケ
ーシング内部に汲み上げ、前記水中ポンプにより
地上に汲み上げることを特徴とする特許請求の範
囲第１項に記載の還元井戸工法。 ４ 前記洗浄用管の上端開口部を下部帯水層の被
圧水位よりも上方に位置させ、該洗浄用管の長手
方向適当位置に空気供給管を接続し、洗浄時に、
空気供給管から洗浄用管への空気供給により生じ
るエアリフトによつて仕切部材下方のストレーナ
ーケーシング内部の地下水を地上に汲み上げるこ
とを特徴とする特許請求の範囲第１項に記載の還
元井戸工法。[Claims] 1. A vertical hole is excavated across the aquifers located above and below the impermeable layer, and water passage holes are formed in the vertical hole at positions corresponding to both the upper and lower aquifers, and A partition member that partitions the interior into upper and lower parts is provided at a position corresponding to the impermeable layer, and a strainer casing with a condensate pipe and a cleaning pipe penetrated through the partition member is inserted, and the strainer casing and the hole are inserted into the partition member. Between the walls, a filter material such as gravel is filled in positions corresponding to both aquifers, and an external packer is formed by injecting a chemical liquid or the like in a position corresponding to the impermeable layer, and the inside of the strainer casing is For cleaning, a submersible pump is inserted above the partition member, and groundwater from the upper aquifer drained by the submersible pump is injected into the strainer casing below the partition member through the condensate pipe. The strainer casing below the partition member is backwashed with groundwater from the lower aquifer by pumping groundwater inside the strainer casing below the partition member to the ground through the cleaning pipe when the system is stopped. Reduction well method. 2. The upper end opening of the cleaning pipe is located below the pressurized water level of the lower aquifer, and the cleaning pipe is provided with a valve that is opened and closed by operation from the ground, so that during cleaning, the lower aquifer Groundwater inside the strainer casing below the partition member is pumped up into the strainer casing above the partition member by the difference in water level between the pressurized water level and the upper end opening of the cleaning pipe, and the underground water is pumped to the ground by the submersible pump. A reduction well construction method according to claim 1. 3. The upper end opening of the cleaning pipe is located below the pressurized water level of the lower aquifer, and the cleaning pipe is provided with a valve that can be opened and closed by operation from the ground;
An air supply pipe is connected to an appropriate position in the longitudinal direction of the cleaning pipe, and during cleaning, the water level difference between the pressurized water level of the lower aquifer and the upper end opening of the cleaning pipe and the water level between the air supply pipe and the cleaning pipe are The submersible pump pumps groundwater inside the strainer casing below the partition member into the strainer casing above the partition member by an air lift generated by supplying air to the submersible pump. Reduction well construction method described in . 4. Position the upper end opening of the cleaning pipe above the pressurized water level of the lower aquifer, connect an air supply pipe to an appropriate position in the longitudinal direction of the cleaning pipe, and during cleaning,
2. The reduction well construction method according to claim 1, wherein the underground water inside the strainer casing below the partition member is pumped up to the ground by an air lift generated by supplying air from the air supply pipe to the cleaning pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5355585A JPS61211415A (en) | 1985-03-18 | 1985-03-18 | Reduction well construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5355585A JPS61211415A (en) | 1985-03-18 | 1985-03-18 | Reduction well construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61211415A JPS61211415A (en) | 1986-09-19 |
| JPH04126B2 true JPH04126B2 (en) | 1992-01-06 |
Family
ID=12946047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5355585A Granted JPS61211415A (en) | 1985-03-18 | 1985-03-18 | Reduction well construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61211415A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510549B (en) * | 2012-06-28 | 2016-09-21 | 上海市政工程设计研究总院（集团）有限公司 | A kind of method to set up of the pressure relief device for structures anti-floating |
| CN105804104B (en) * | 2015-03-13 | 2017-08-15 | 河北建设集团卓诚路桥工程有限公司 | A kind of construction method of well-points dewatering |
| CN108930279B (en) * | 2017-05-27 | 2021-01-15 | 中国二十冶集团有限公司 | Method for sealing deep foundation pit downcast pipe well after excavation |
-
1985
- 1985-03-18 JP JP5355585A patent/JPS61211415A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61211415A (en) | 1986-09-19 |
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