JPS61242216A - Lowering of groundwater level in civil construction work - Google Patents

Lowering of groundwater level in civil construction work

Info

Publication number
JPS61242216A
JPS61242216A JP8407885A JP8407885A JPS61242216A JP S61242216 A JPS61242216 A JP S61242216A JP 8407885 A JP8407885 A JP 8407885A JP 8407885 A JP8407885 A JP 8407885A JP S61242216 A JPS61242216 A JP S61242216A
Authority
JP
Japan
Prior art keywords
water
pipe
well
clay layer
lowering
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.)
Pending
Application number
JP8407885A
Other languages
Japanese (ja)
Inventor
Teruhiko Takano
高野　輝彦
Seiichiro Nagashima
長島　誠一郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP8407885A priority Critical patent/JPS61242216A/en
Publication of JPS61242216A publication Critical patent/JPS61242216A/en
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/10—Restraining of underground water by lowering level of ground water

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Foundations (AREA)

Abstract

PURPOSE:To reduce the cost of construction work by a method in which a water-liftting well is excavated to a depth enough to pass through the clay layer, a water-stop board is provided in the clay position within the well, and groundwater coming out above the water stop board is injected under pressures below the waterstop board. CONSTITUTION:Spring water coming out of the layer above a clay layer 1 flows through the slits of a water-lifting screen 8 into a water-lifting well 11 and is stored in a water-stop board 6. The spring water is then taken into a water-lifting pipe 12 by a pump 13, partly sent out through a sluice valve 20b to a pipe 22, and partly sent through a sluice valve 20a into a water supply pipe 15. The spring water passes through the pipe 15, is discharged through a screen 17 into a water supply chamber 16, and then injected under pressures through a water supply screen 4 and gravels 5 into the stratum lower than the clay layer 1.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、土木工事等の際に湧出する地下水の処理を簡
単に行えるようにした土木工事における地下水位の低下
方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for lowering the groundwater level in civil engineering works, which makes it possible to easily treat groundwater gushing out during civil engineering works.

［従来の技術］ ビル、橋梁、塔などを地上に構築するに際しては、底部
（脚部）を地中に設置するために地面に穴を掘る基礎工
事が行われる。このような工事に際し、地下水が大量に
湧出する場合がある。この湧出水が工事現場に流れ出る
のを防止するため、通常、工事現場に隣接して地下水を
汲み上げるための揚水井が掘られ、汲み上げた地下水を
下水道等に捨てている。また、地下水を汲み上げること
によって地盤沈下を生じる恐れがある場合、或いは近く
に下水連が無い場合には、別途に注入井を掘り、揚水井
戸により汲み上げた地下水を地中に戻すことが行われて
いる。[Background Art] When constructing buildings, bridges, towers, etc. on the ground, foundation work is performed by digging a hole in the ground in order to install the bottom (legs) underground. During such construction work, large amounts of groundwater may gush out. In order to prevent this spring water from flowing into the construction site, a pumping well is usually dug adjacent to the construction site to pump up groundwater, and the pumped groundwater is disposed of into a sewer system or the like. In addition, if there is a risk of ground subsidence due to pumping up groundwater, or if there is no sewage system nearby, a separate injection well is dug and the groundwater pumped up by the pumping well is returned to the ground. There is.

［発明が解決しようとする問題点１ しかし、従来の土木工事における湧水の処理は、揚水を
下水道に捨てる場合には下水料金が高くつくと共に、更
に、注入井を設けた場合には工程増のために工事費が高
くなる不都合がある。[Problem to be Solved by the Invention 1] However, the conventional treatment of spring water in civil engineering works requires high sewage charges when pumped water is disposed of into the sewer system, and additional process increases when an injection well is installed. This has the disadvantage of increasing construction costs.

［問題を解決するための手段］ 本発明は工事現場に隣接して掘られ湧水を処理する井戸
において、−木の井戸を湧水弁と圧入井に兼用するよう
にしたものである。また、注入点を粘土層よりも下の層
にすることにより、湧水が再度工事現場等へ湧出するの
を防止することができる。[Means for Solving the Problems] The present invention is a well dug adjacent to a construction site for treating spring water, in which a wooden well is used both as a spring water valve and an injection well. Furthermore, by placing the injection point in a layer below the clay layer, it is possible to prevent spring water from gushing out again to a construction site or the like.

［作用］ 本発明においては、粘土層を貫通する地層まで揚水井を
掘り、その井戸内の粘土層位置に遮水板を設け、該遮水
板の上部に湧き出た地下水の一部（又は全部）を前記遮
水板の下部に圧入する方法がとちれているので、別途に
注水弁を掘ることなく湧水を地中に戻すことができ、工
事期間及び工事費に無駄を生じない、また、湧き出た地
下水の圧入点を粘土層の下層にしたため、工事現場への
湧水発生を防止することができる。[Function] In the present invention, a pumping well is dug up to the stratum penetrating the clay layer, a water shield plate is provided at the clay layer position in the well, and a part (or all) of the groundwater that gushes out above the water shield plate is drained. ) into the lower part of the water shield plate, spring water can be returned underground without digging a separate water injection valve, and there is no waste in construction period and construction costs. In addition, since the injection point of the groundwater is placed below the clay layer, it is possible to prevent spring water from flowing into the construction site.

［実施例］ 第１図及び第２図は本発明の一実施例を示す正面断面図
および平面図である。[Embodiment] FIGS. 1 and 2 are a front sectional view and a plan view showing an embodiment of the present invention.

先ず、比較的大きな径（例えば、直径１ｍ）の穴を粘土
層ｌを貫通するまで掘り進めたのち、内壁面に近接して
垂直に観測井が２が設けられる。First, a hole with a relatively large diameter (for example, 1 m in diameter) is dug until it penetrates the clay layer 1, and then an observation well 2 is provided vertically close to the inner wall surface.

ついで、穴の底面に鉄製の円板状の底蓋３を設ける。更
に、底蓋３の上面に粘土層ｌの下面に達する高さの注水
スクリーン４を設置する。注水スクリーン４は１例えば
、直径８０ｃｍであって、円周方向にスリットを設け、
このスリットを通して通水できるようにしたものである
。（尚、スリットに代えて、小さな貫通孔を多数設ける
ものとしてもよい、）この注水スクリーン４の外周辺に
フィルター材としての砂利５が埋め込まれる。ついで、
注水スクリーン４の上部に遮水盤６が設置される。この
遮水盤６は粘土層ｌが存在するレベルに設けられ、粘土
層ｌよりも上の層から湧き出た水を粘土層１より下の暦
に圧入して該粘土層１より上側に戻るのを防止するため
のもので、鉄材等を用いて作られた円筒体と円板体の組
合せで構成される。遮水盤６の外周にはコンクリートの
打込みによるシール部７が形成され、粘土層１と遮水盤
６の密着を高めている。更に、遮水盤６の上部には同一
径で且つ注水スクリーン４と同様の構成の揚水スクリー
ン８が設置されると共に、その外周にフィルタ材として
の砂利９が埋め込まれる。つぎに揚水スクリーン８の上
部に円筒状で外周面に通水口を持たない鉄製の井戸管１
０（揚水スクリーン８と同一径）が設置される。この井
戸管１０の上端は地表レベルまたはやや突出する長さを
有し、その外周には砂利が埋め込まれる。Next, an iron disc-shaped bottom cover 3 is provided on the bottom of the hole. Further, a water pouring screen 4 having a height reaching the lower surface of the clay layer 1 is installed on the upper surface of the bottom cover 3. The water injection screen 4 has a diameter of 80 cm, for example, and has slits in the circumferential direction.
Water can be passed through this slit. (Instead of slits, many small through holes may be provided.) Gravel 5 as a filter material is embedded around the outer periphery of this water injection screen 4. Then,
A water shielding board 6 is installed above the water injection screen 4. This impermeable plate 6 is installed at the level where the clay layer 1 exists, and prevents water gushing out from the layer above the clay layer 1 from being injected into the calendar below the clay layer 1 and returning to the upper side of the clay layer 1. It is made of a combination of a cylindrical body and a disc body made of iron or the like. A sealing portion 7 is formed on the outer periphery of the water shielding board 6 by pouring concrete to enhance the adhesion between the clay layer 1 and the water shielding board 6. Further, a water pumping screen 8 having the same diameter and the same configuration as the water injection screen 4 is installed above the water shielding board 6, and gravel 9 as a filter material is embedded in the outer periphery of the water pumping screen 8. Next, on the top of the pumping screen 8, a cylindrical iron well pipe 1 with no water holes on the outer circumferential surface is installed.
0 (same diameter as pumping screen 8) is installed. The upper end of this well pipe 10 has a length that is at ground level or slightly protrudes, and gravel is embedded around its outer periphery.

このようにして形成された揚水井ｌｌ内に、下端に揚水
ポンプ１３の装着された揚水パイプ１２を挿入する。揚
水パイプ１２の揚水ポンプ１３の上部には汲み上げた水
がポンプ側へ流れるのを阻止するための逆止弁１４が設
けられている。また、揚水パイプ１２は、揚水ポンプ１
３が遮水盤６の上面に近接するように配設される。A pumping pipe 12 with a pumping pump 13 attached to its lower end is inserted into the pumping well 11 thus formed. A check valve 14 is provided above the water pump 13 of the water pump 12 to prevent pumped water from flowing toward the pump. In addition, the pumping pipe 12 is connected to the pumping pump 1
3 is disposed close to the upper surface of the water shielding board 6.

揚水パイプ１２に並列して、揚水井ｌｌ内には、注水パ
イプ１５が、遮水盤６を貫通し注水室１６に達するよう
にして設置される。注水パイプ１５の注水室１６に介在
する部分は、砂利等が注水室１６内に堆積しても注水が
可能なように、外周面に通水孔が多数設けられたスクリ
ーン１７が形成されている。更に、注水パイプ１５内に
は同軸上に圧気パイプ１８が設置される。圧気パイプ１
５の上端は図示せぬコンプレッサに接続された接続パイ
プに結合される。A water injection pipe 15 is installed in the pumping well 11 in parallel with the water pumping pipe 12 so as to penetrate the water shielding plate 6 and reach the water injection chamber 16. The portion of the water injection pipe 15 that is interposed in the water injection chamber 16 is formed with a screen 17 having a large number of water passage holes on its outer circumferential surface so that water can be injected even if gravel or the like accumulates in the water injection chamber 16. . Furthermore, a pressure pipe 18 is installed coaxially within the water injection pipe 15. Pressure pipe 1
The upper end of 5 is connected to a connecting pipe connected to a compressor (not shown).

揚水パイプ１２の上部と注水パイプ１５の上部とはパイ
プ１９を介して連結され、該パイプ１９内にはスリース
バルブ２０ａ及び流量計２°１が設けられる。更に、揚
水パイプ１２の上部には、下水道等に揚水を送り込むた
めのパイプ２２が設けられると共に、該パイプ２２内に
はスリースバルブ２０ｂが設けられる。The upper part of the water pumping pipe 12 and the upper part of the water injection pipe 15 are connected through a pipe 19, and a sleaze valve 20a and a flow meter 2°1 are provided in the pipe 19. Furthermore, a pipe 22 for sending pumped water to a sewer or the like is provided above the water pumping pipe 12, and a sleet valve 20b is provided within the pipe 22.

以上の構成において、粘土層１よりも上の層より湧き出
た水は、揚水スクリーン８のスリット部を介して揚水井
１１内に流入し、遮水盤６内に貯留する。この湧水は揚
水ポンプ１３によって揚水パイプ１２内に取り込まれ、
汲み上げられる。汲み上げられた水の一部はスリースバ
ルブ２０ｂを介してパイプ２２に送り出され、残りはス
リースバルブ２０ａを介して注水パイプ１５内へ送り込
まれる。In the above configuration, water gushing out from the layer above the clay layer 1 flows into the pumping well 11 through the slit portion of the pumping screen 8 and is stored in the water shielding board 6. This spring water is taken into the pumping pipe 12 by the pumping pump 13,
Pumped up. A portion of the pumped water is sent to the pipe 22 via the Sleece valve 20b, and the rest is sent into the water injection pipe 15 via the Sleece valve 20a.

注水パイプ１５へ送り込まれた湧水は、注水パイプ１５
内を通過し、スクリーン１７を介して注水室１６へ放出
され、更に、注水スクリーン４及び砂利５を介して粘土
層１よりも下層の地層内へ圧入される。このとき、圧気
パイプ１８を介して注水室１６へ圧縮空気が供給され、
圧入のための圧力を高めている。尚、スリースバルブ２
０ｂを閉めることによって揚水の全部が注水パイプ１５
へ供給される。また、バルブ２０ａを全開にし、バルブ
２０ｂを開くことによって湧水は下水道側にのみ放出さ
れる。The spring water sent to the water injection pipe 15 is
The water passes through the water, is discharged into the water injection chamber 16 through the screen 17, and is further forced into the stratum below the clay layer 1 through the water injection screen 4 and gravel 5. At this time, compressed air is supplied to the water injection chamber 16 via the compressed air pipe 18,
The pressure for press-fitting is increasing. In addition, three-way valve 2
By closing 0b, all of the pumped water is transferred to the water injection pipe 15.
supplied to Further, by fully opening the valve 20a and opening the valve 20b, spring water is discharged only to the sewer side.

注水室１６からの地中への注入量が多くて粘土層ｌより
下層の水位が上昇してきた場合には、バルブ２０ａの開
度を小さくし、圧入水量を減らすようにする。この場合
の水位上昇は観測井２により監視する。When the amount of water injected into the ground from the water injection chamber 16 is large and the water level below the clay layer 1 rises, the opening degree of the valve 20a is reduced to reduce the amount of water injected. In this case, the water level rise will be monitored by observation well 2.

以上の処理は、目的の工事が終了するまで続けられ、工
事の終了後に揚水ポンプ１２及び注水パイプ１５を地上
に引き上げ、他のスクリーン類及び井戸管１０等は地中
に埋設する。The above processing is continued until the target construction is completed, and after the construction is completed, the water pump 12 and water injection pipe 15 are raised above ground, and other screens, well pipes 10, etc. are buried underground.

［発明の効果］ 以上より明らかなように本発明によれば、揚水井と注水
弁を兼用し、且つ粘土層よりも下位の地層へ注水するよ
うにしたため、注水弁（圧入井）を別途に設ける必要が
無く、下水道への放出も必要が無いため、工事工程を省
略化できるのみならず、工事費及び下水料金を低減する
ことができる。また、粘土層より下の地層へ注水するこ
とにより、地盤沈下を防止し且つ工事現場への湧水発生
を防止することができる。[Effects of the Invention] As is clear from the above, according to the present invention, a water pumping well and a water injection valve are used together, and water is injected into a stratum below the clay layer, so a water injection valve (injection well) is separately provided. Since there is no need to install it and there is no need to discharge it into the sewer, it is possible to not only omit the construction process but also reduce construction costs and sewer charges. In addition, by injecting water into the strata below the clay layer, it is possible to prevent ground subsidence and prevent water from flowing into the construction site.

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

第１図は本発明の一実施例を示す正面断面図、第２図は
平面図である。 １・・・粘土層、　　２・・・観測井、　３・・・底蓋
、４・・・注水スクリーン、　５．９・・・砂利、６・
・・遮水盤、　　　　　　７・・・シール部、８・・・
揚水スクリーン、　　　１０・・・井戸管、１１・・・
揚水井、　　　　　１２・・・揚水パイプ、１３・・・
揚水ポンプ、　　　１４・・・逆止弁、１５・・・注水
パイプ、　　　１６・・・注水室、１７・・・スクリー
ン、　　　１８・・・圧気パイプ。 １９．２２・・・パイプ。 ２０ａ、２０ｂ・・・スリースバルブ。FIG. 1 is a front sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view. 1...Clay layer, 2...Observation well, 3...Bottom cover, 4...Water injection screen, 5.9...Gravel, 6.
・・Water shield plate, 7・Seal part, 8・・
Pumping screen, 10...Well pipe, 11...
Pumping well, 12... Pumping pipe, 13...
Water pump, 14... Check valve, 15... Water injection pipe, 16... Water injection chamber, 17... Screen, 18... Pressure pipe. 19.22...Pipe. 20a, 20b... Sleeve valve.

Claims (4)

【特許請求の範囲】[Claims] （１）土木工事を行うに際し、粘土層を貫通する深さま
で揚水井を掘削し、該揚水井内の前記粘土層の現出位置
に遮水盤を設けて該遮水盤のに下部に注水室を形成し、
前記遮水盤の上部に湧水する地下水を汲み上げたのに、
その少なくとも一部を前記注水室へ供給して地中に圧入
することを特徴とする土木工事における地下水位の低下
方法。(1) When carrying out civil engineering work, a pumping well is excavated to a depth that penetrates the clay layer, a water shielding board is installed at the exposed position of the clay layer in the pumping well, and a water injection chamber is formed below the water shielding board. death,
Even though the underground water that springs above the water-shielding board was pumped up,
A method for lowering a groundwater level in civil engineering work, characterized by supplying at least a part of the water to the water injection chamber and injecting it into the ground. （２）前記揚水井の前記遮水盤設置位置上部の側壁およ
び前記注水室の側壁を透水材により形成したことを特徴
とする特許請求の範囲第１項に記載の土木工事における
地下水位の低下方法。(2) The method for lowering the groundwater level in civil engineering work according to claim 1, characterized in that the side wall above the water shielding board installation position of the pumping well and the side wall of the water injection chamber are formed of a water-permeable material. . （３）前記注水室への砂利等の流入を防止する底板を揚
水井底面に設けたことを特徴とする特許請求の範囲第１
項又は第２項に記載の土木工事における地下水位の低下
方法。(3) Claim 1, characterized in that a bottom plate is provided on the bottom surface of the pumping well to prevent gravel and the like from flowing into the water injection chamber.
A method for lowering the groundwater level in civil engineering work described in paragraph 2 or paragraph 2. （４）前記粘土層より下位の層の地下水位を検出する観
測井を前記揚水井に沿って設置し、その水位検出値に応
じて前記注水室への揚水供給量を調整することを特徴と
する特許請求の範囲第１項ないし第３項のいずれか１項
に記載の土木工事における地下水位の低下方法。(4) An observation well for detecting the groundwater level in a layer below the clay layer is installed along the pumping well, and the amount of pumped water supplied to the water injection chamber is adjusted according to the detected water level. A method for lowering a groundwater level in civil engineering work according to any one of claims 1 to 3.
JP8407885A 1985-04-19 1985-04-19 Lowering of groundwater level in civil construction work Pending JPS61242216A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8407885A JPS61242216A (en) 1985-04-19 1985-04-19 Lowering of groundwater level in civil construction work

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8407885A JPS61242216A (en) 1985-04-19 1985-04-19 Lowering of groundwater level in civil construction work

Publications (1)

Publication Number Publication Date
JPS61242216A true JPS61242216A (en) 1986-10-28

Family

ID=13820451

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8407885A Pending JPS61242216A (en) 1985-04-19 1985-04-19 Lowering of groundwater level in civil construction work

Country Status (1)

Country Link
JP (1) JPS61242216A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016098554A (en) * 2014-11-21 2016-05-30 五洋建設株式会社 Observation method for ground water and tube body for observation used therefor
CN108978693A (en) * 2017-05-06 2018-12-11 韩少鹏 Base pit engineering soft soil foundation dewatering construction structure
CN110130377A (en) * 2019-05-09 2019-08-16 同济大学 Combined shaft and application are shared for the double plate water isolation types of foundation pit drainage-decompression inward turning
CN117266212A (en) * 2023-11-23 2023-12-22 北京建工集团有限责任公司 Low-cost dewatering method for foundation pit positioned in runoff-type interlayer water-containing stratum

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016098554A (en) * 2014-11-21 2016-05-30 五洋建設株式会社 Observation method for ground water and tube body for observation used therefor
CN108978693A (en) * 2017-05-06 2018-12-11 韩少鹏 Base pit engineering soft soil foundation dewatering construction structure
CN110130377A (en) * 2019-05-09 2019-08-16 同济大学 Combined shaft and application are shared for the double plate water isolation types of foundation pit drainage-decompression inward turning
CN117266212A (en) * 2023-11-23 2023-12-22 北京建工集团有限责任公司 Low-cost dewatering method for foundation pit positioned in runoff-type interlayer water-containing stratum
CN117266212B (en) * 2023-11-23 2024-02-09 北京建工集团有限责任公司 Precipitation method for foundation pit located in runoff-type interlayer water-containing stratum

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