JP6667822B1 - Pumping well with irrigation pipe - Google Patents

Pumping well with irrigation pipe Download PDF

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JP6667822B1
JP6667822B1 JP2019156347A JP2019156347A JP6667822B1 JP 6667822 B1 JP6667822 B1 JP 6667822B1 JP 2019156347 A JP2019156347 A JP 2019156347A JP 2019156347 A JP2019156347 A JP 2019156347A JP 6667822 B1 JP6667822 B1 JP 6667822B1
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water injection
pipe
well
water
liquid
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JP2021032030A (en
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顕治郎 本多
顕治郎 本多
聡 西原
聡 西原
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A X C CORPORATION
Nikken Shoji Co Ltd
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Nikken Shoji Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/34—Foundations for sinking or earthquake territories
    • 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
    • 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
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil

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  • General Life Sciences & Earth Sciences (AREA)
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  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soil Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Foundations (AREA)

Abstract

【課題】注水管付揚水井を設置するにあたり、注水管を設ける手間を削減する。【解決手段】注水管付揚水井１００は、地中に垂設されるとともに周壁１１に地下水流入孔１ａを有する井戸管１と、井戸管１に環装されるとともに地下水を通す通水部２１を有するストレーナ２と、井戸管１の外周面１１とストレーナ２に挟設されてストレーナ２を支持する少なくとも１本の棒材、又は管材からなる枕材４とを備えている。枕材４は、少なくとも１本が注水管３を兼ねて液体を噴射する注水口３ａを備える。【選択図】図１PROBLEM TO BE SOLVED: To reduce the time and effort for providing a water injection pipe when installing a pumping well with a water injection pipe. SOLUTION: A pumping well 100 with a water injection pipe has a well pipe 1 vertically installed in the ground and having a groundwater inflow hole 1a in a peripheral wall 11, and a water passage portion 21 which is surrounded by the well pipe 1 and through which groundwater passes. The strainer 2 having the above, and the outer peripheral surface 11 of the well tube 1 and at least one rod member sandwiched between the strainer 2 and supporting the strainer 2 or the pillow member 4 made of a pipe material. At least one of the pillows 4 also has a water injection port 3a that also serves as the water injection pipe 3 and injects the liquid. [Selection diagram] Fig. 1

Description

この発明は、地盤改良等を目的として地下水を揚水する揚水井に関し、特に、地中へ液体を注入する注水管が付設された揚水井に関する。   The present invention relates to a pumping well for pumping groundwater for the purpose of ground improvement, and more particularly to a pumping well provided with a water injection pipe for injecting liquid into the ground.

近年、液状化が懸念される地盤に、水とともに空気を注入し、土粒子間に含まれる間隙水に空気を含ませて、地盤を不飽和化することにより液状化を防止する液状化防止工法が各種提案されている。
地盤の液状化現象は、地盤の変形に伴う間隙水の圧力上昇により土粒子構造が破壊されて発生するところ、このマイクロバブル水を注入する工法は、間隙水に気泡を含ませ、気泡をクッションとして間隙水の圧力上昇を抑制しようとするものである。 In recent years, the liquefaction prevention method of injecting air together with water into the ground where liquefaction is a concern and allowing air to be included in the pore water contained between the soil particles to desaturate the ground and prevent liquefaction Have been proposed.
The liquefaction of the ground occurs when the pressure of pore water rises due to the deformation of the ground and the soil particle structure is destroyed.The method of injecting micro-bubble water involves adding air bubbles to the pore water and cushioning the bubbles. This is intended to suppress the rise in pressure of pore water.

かかる液状化防止工法では、揚水井で地下水を汲み揚げたのち、あるいは汲み揚げながら空気と水の注入を行うため、揚水井と注水管の両方を地中に立設する必要があり、単に揚水井を設置するよりも手間がかかるという問題があった。   In such a liquefaction prevention method, after pumping and pumping groundwater in a pumping well, or injecting air and water while pumping, both the pumping well and the injection pipe need to be erected underground. There was a problem that it took more time than setting up a well.

そこで、本出願人らは、未公開ではあるが、先に行った特許出願（特許文献１）において、地中にファインバブル水を注入するにあたり、揚水井における井戸管を囲繞する砂や硅砂等からなるフィルタ材中に注水管を立設する技術や、揚水井の井戸管自体を注水管とする技術を提案している。   Therefore, the present applicants have not disclosed, but in the patent application (Patent Document 1) filed earlier, when injecting fine bubble water into the ground, sand or silica sand surrounding a well pipe in a pumping well is considered. It proposes a technology for erecting a water injection pipe in a filter material made of, and a technology for using a well pipe of a pumping well itself as a water injection pipe.

特願２０１８−２２５０７７号Japanese Patent Application No. 2018-225077

しかし、フィルタ材中に注水管を立設する場合、単に揚水井のみを設置する場合に比べると、なお注水管を設置する手間がかかるという課題があり、また、井戸管自体を注水管にする場合は、ファインバブル水の噴射に用いる地下水流入孔が、井戸管の下端近傍にのみ設けられているため、これより浅い位置の地盤にはファインバブル水を注入できないという課題があった。
本発明は、上記課題に鑑みてなされたものであり、揚水井を設置する以上の手間を抑制し、かつ、地盤の浅い所へも地盤改良のための液体（以下、「注入液」ともいう。）を注入可能な揚水井を提供することを目的とする。 However, when the water injection pipe is erected in the filter material, there is a problem that it takes more time to install the water injection pipe than when only the pumping well is installed, and the well pipe itself is used as the water injection pipe. In such a case, there is a problem that fine bubble water cannot be injected into the ground at a position shallower than the ground because the groundwater inflow hole used for jetting fine bubble water is provided only near the lower end of the well pipe.
The present invention has been made in view of the above-mentioned problems, and suppresses the trouble of installing a pumping well, and, even in a shallow place of the ground, a liquid for improving the ground (hereinafter, also referred to as “injection liquid”). )) To provide a pumping well.

上記課題を解決するためになされた発明は、地中へ液体を注入する注水管を備えた注水管付揚水井であって、地中に垂設されるとともに周壁に地下水流入孔を有する井戸管と、前記井戸管に環装されるとともに地下水を通す通水部を有するストレーナと、前記井戸管の外周面と前記ストレーナに挟設されて前記ストレーナを支持する少なくとも１本の棒材、又は管材からなる枕材とを備え、前記枕材は、少なくとも１本が注水管を兼ねて液体を噴射する注水口を備えることを特徴とする。   The invention made in order to solve the above-mentioned problem is a pumping well with a water injection pipe provided with a water injection pipe for injecting liquid into the ground, wherein the well pipe is vertically installed in the ground and has a groundwater inflow hole in a peripheral wall. A strainer mounted on the well pipe and having a water passage portion through which groundwater passes, and at least one rod or pipe sandwiched between the outer peripheral surface of the well pipe and the strainer and supporting the strainer And at least one of the pillows is provided with a water injection port which also serves as a water injection pipe and injects a liquid.

従来、揚水井のストレーナは、井戸管外周に固設された管材や棒材を枕材として、井戸管外周に環装されている。この枕材を注水管とすることで、揚水井のみを設置する以上の手間をかけることなく、揚水井とともに注水管を地中に埋設できる。   Conventionally, a strainer for a pumping well is mounted around the outer periphery of the well pipe using a pipe or a bar fixed to the outer circumference of the well pipe as a pillow. By using this pillow material as a filling pipe, the filling pipe can be buried in the ground together with the pumping well without taking more time than installing only the pumping well.

前記注水口は、前記井戸管と前記ストレーナの間の空間に注入液を噴射することが好ましい。こうすることで、当該空間を分配室として、ストレーナの間隙から周辺の地中に注入液を噴射できるので、広い範囲に注入液を噴射することができる。   It is preferable that the water injection port injects the injection liquid into a space between the well pipe and the strainer. By doing so, the space can be used as a distribution chamber to inject the injection liquid from the gap between the strainers into the surrounding ground, so that the injection liquid can be injected over a wide range.

本発明の注水管付揚水井は、前記注水口から注入液が噴射される方向において、前記井戸管の外周面に突設される変向体を有することが好ましい。こうすることで、井戸管とストレーナの間の空間内で生じる乱流を抑制して、効率よく揚水井の周囲の地盤へ注入液を噴射できる。   It is preferable that the pumping well with a water injection pipe of the present invention has a diverting body projecting from an outer peripheral surface of the well pipe in a direction in which the injection liquid is jetted from the water injection port. By doing so, the turbulence generated in the space between the well pipe and the strainer can be suppressed, and the injected liquid can be efficiently injected into the ground around the pumping well.

本発明の注水管付揚水井は、前記枕材を複数本備え、前記複数の枕材のうち２以上の枕材が注水管を兼ねており、当該２以上の注水管を上端で連結する分配室を有するが好ましい。こうすることで、各注水管に対し、均等に注入液を流送できる。   The pumping well with a water injection pipe of the present invention is provided with a plurality of the pillows, and two or more pillows among the plurality of pillows also serve as a water injection pipe, and a distribution connecting the two or more water injection pipes at an upper end. It is preferable to have a chamber. In this way, the infusate can be evenly fed to each water injection pipe.

前記分配室は、地中に設けられることが好ましい。こうすることで、地上から注水管の上端まで注入液を流送する流送管を１本にまとめることできるため、設置コストを低減できる。   Preferably, the distribution chamber is provided underground. By doing so, the flow pipe for feeding the injection liquid from the ground to the upper end of the water injection pipe can be integrated into one pipe, so that the installation cost can be reduced.

前記分配室は、地表に設けられることが好ましい。こうすることで、分配室のメンテナンスを容易に行うことができる。   Preferably, the distribution chamber is provided on the ground surface. By doing so, maintenance of the distribution chamber can be easily performed.

以上、説明したように、本発明の注水管付揚水井によれば、従来の注水管を備えない揚水井と変わらない手間で設置することができ、また地盤の浅い所へも注入液を噴出することができる。   As described above, according to the pumping well with a water injection pipe of the present invention, the pumping well can be installed with the same effort as a conventional pumping well without a water injection pipe, and the injection liquid is also ejected to a shallow place of the ground. can do.

本発明の第１実施形態に係る注水管付揚水井の側面視断面図である。It is a side view sectional view of a pumping well with a filling pipe concerning a 1st embodiment of the present invention. 図１の分配器周辺を側面視で示した部分透視拡大図である。It is the partial see-through | perspective enlarged view which showed the periphery of the distributor of FIG. 1 by the side view. 図２におけるＸ−Ｘ線断面図である。It is XX sectional drawing in FIG. 図２におけるＹ−Ｙ線断面図である。FIG. 3 is a sectional view taken along line YY in FIG. 2. （ａ）は、図２に示した円筒状の分配室を平面状に展開して、分配室内を注入液が流れる様子を示す説明図である。（ｂ）は、（ａ）におけるＺ−Ｚ線断面図、（ｃ）は、（ａ）におけるＷ−Ｗ線断面図である。FIG. 3A is an explanatory view showing a state in which an injection liquid flows in the distribution chamber by developing the cylindrical distribution chamber shown in FIG. 2 into a planar shape. (B) is a sectional view taken along line ZZ in (a), and (c) is a sectional view taken along line WW in (a). 図１の注水管から注入液が噴射する様子を平面視で示した説明図である。FIG. 2 is an explanatory diagram showing a state in which an injection liquid is jetted from a water injection pipe in FIG. 1 in a plan view. 図１の注水管を側面視で示した拡大断面図である。It is the expanded sectional view which showed the water injection pipe of FIG. 1 in the side view. 本発明の第２実施形態に係る注水管付揚水井の側面視断面図である。It is a side view sectional view of a pumping well with a filling pipe concerning a 2nd embodiment of the present invention. （ａ）図８の分配室周辺を示した要部拡大図である。（ｂ）（ａ）におけるＶ−Ｖ線断面図である。(A) It is a principal part enlarged view which showed the distribution chamber periphery of FIG. 5B is a sectional view taken along line VV in FIG. 本発明のその他の実施形態に係る注水管付揚水井である。It is a pumping well with a water injection pipe according to another embodiment of the present invention.

以下、適宜図面を用いながら本発明の実施形態について詳述する。ただし、本発明は以下の実施形態に限られるものではない。また、各実施形態の構成は、他の実施形態における構成と適宜に組み合わせることができる。
（第１実施形態）
図１は、本発明の第１実施形態に係る注水管付揚水井１００を示している。注水管付揚水井１００は、ウルトラディープ工法（登録商標）に用いられる揚水井であり、液状化防止等の地盤改良を目的として、地下水の汲み揚げと、地盤へのファインバブル水等の注入液Ｗを注入するために用いられる。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. However, the present invention is not limited to the following embodiments. In addition, the configuration of each embodiment can be appropriately combined with the configuration of another embodiment.
(1st Embodiment)
FIG. 1 shows a pumping well 100 with a water injection pipe according to a first embodiment of the present invention. The pumping well 100 with a water injection pipe is a pumping well used for the Ultra Deep Construction Method (registered trademark). For the purpose of ground improvement such as prevention of liquefaction, pumping of groundwater and injection of fine bubble water or the like into the ground. Used to inject W.

注水管付揚水井１００は、図１に示すように、地中に垂設される井戸管１と、井戸管１に環装されるストレーナ２と、地中へ注入液Ｗを注入する１本、又は複数本の注水管３，３，…とを主に備える他、井戸管１内へ流入した地下水を汲み揚げる揚水ポンプ５と、注入液Ｗを注水管３，３，…へ分配する分配器６と、汲み揚げた水を地上へ流送する揚水管５１と、注入液Ｗを井戸管１、及び分配器６へ流送する送液管７と、井戸管１に過剰に充填された注入液Ｗを還流するリターン管８とを備えている。
井戸管１は、地中に垂設される竪穴内に挿入したのち、周囲を砂や珪砂等からなるフィルタ材１７（図２参照）で埋めるようにして立設される。 As shown in FIG. 1, a pumping well 100 with a water injection pipe includes a well pipe 1 vertically installed in the ground, a strainer 2 wrapped around the well pipe 1, and a single pipe for injecting the injection liquid W into the ground. , Or a plurality of water injection pipes 3, 3,..., And a water pump 5 for pumping the groundwater flowing into the well pipe 1 and a distribution for distributing the infusate W to the water injection pipes 3, 3,. The vessel 6, a water pump 51 for feeding the pumped water to the ground, a liquid pipe 7 for flowing the infusate W to the well pipe 1 and the distributor 6, and the well pipe 1 was excessively filled. A return pipe 8 for refluxing the injection liquid W;
The well pipe 1 is inserted into a pit vertically suspended in the ground, and then erected so as to be filled with a filter material 17 (see FIG. 2) made of sand, silica sand, or the like.

井戸管１は、有底の円筒鋼管からなり、上端縁にフランジ１６が設けられ、蓋材９により閉塞される。井戸管１は、底壁１２から上方へやや離間した位置の周壁に、円形貫通孔からなる多数の地下水流入孔１ａ，１ａ，…が、周方向、及び長手方向に分散配置されている。地下水流入孔１ａから底壁１２までの空間１４は、砂溜まりを構成する。図示の例では、地下水流入孔１ａは円形孔であるが、これに限らずスリット等であってもよい。井戸管１には、蓋材９を介して送液管７から分岐した送液枝管７２、リターン管８が連結されている。   The well pipe 1 is formed of a cylindrical steel pipe with a bottom, a flange 16 is provided at an upper end edge, and is closed by a lid 9. The well pipe 1 has a large number of groundwater inflow holes 1a, 1a,... Formed of circular through holes arranged in a circumferential direction and a longitudinal direction on a peripheral wall at a position slightly above the bottom wall 12. The space 14 from the groundwater inflow hole 1a to the bottom wall 12 forms a sand pool. In the illustrated example, the groundwater inflow hole 1a is a circular hole, but is not limited thereto and may be a slit or the like. The well pipe 1 is connected with a liquid feed branch pipe 72 and a return pipe 8 branched from the liquid feed pipe 7 via a lid member 9.

ストレーナ２は、図６に示すように、注水管３（枕材４）を介して井戸管１に線材を巻回した円筒コイル状をなしている。ストレーナ２は、隣接する線材間に若干の隙間を有しており、この隙間が特許請求の範囲でいうところの通水部２１に該当する。
ストレーナ２は、井戸管１の地下水流入孔１ａが設けられた部分全体を概ね被覆するとともに、通水部２１の最上端が、地下水流入孔１ａから十分に間隔を開けて上方に位置するよう設けられている。ストレーナ２と井戸管１の間の空間１３は、その上方、及び下方が、それぞれ円環状のフランジ材６１，２２により閉塞されている。
尚、ストレーナ２は、例えば、亜鉛メッキを施した断面が三角形の鋼線からなるウエッジワイヤが用いられるが、材質、形状ともに、これに限られるものではない。 As shown in FIG. 6, the strainer 2 has a cylindrical coil shape in which a wire is wound around the well pipe 1 via the water injection pipe 3 (pillow material 4). The strainer 2 has a slight gap between adjacent wires, and this gap corresponds to the water passage section 21 in the claims.
The strainer 2 substantially covers the entire portion of the well pipe 1 where the groundwater inflow hole 1a is provided, and is provided such that the uppermost end of the water passage portion 21 is located at a sufficient interval from the groundwater inflow hole 1a and located above. Have been. The space 13 between the strainer 2 and the well tube 1 is closed at its upper and lower sides by annular flange members 61 and 22, respectively.
For the strainer 2, for example, a wedge wire made of a steel wire having a triangular cross section and subjected to galvanization is used, but the material and shape are not limited thereto.

１本、又は複数本（図４の例では８本）の注水管３，３，…は、図１に示すように直管からなり、井戸管１の軸方向に平行に、かつ井戸管１の周方向に等間隔をおいて井戸管１の外周面１１上に並列するよう井戸管１とストレーナ２に挟持されている。
注水管３，３，…は、ストレーナ２を井戸管１の外周面１１の間に空間１３を形成すべく支持する枕材４を兼ねており、図示の例では、すべての枕材４が注水管３であるが、注水管３を兼ねない枕材４を設けてもよい。 One or more (eight in the example of FIG. 4) water injection pipes 3, 3,... Are formed of straight pipes as shown in FIG. Of the well tube 1 and the strainer 2 so as to be arranged on the outer peripheral surface 11 of the well tube 1 at equal intervals in the circumferential direction.
The water injection pipes 3, 3,... Also serve as pillows 4 for supporting the strainer 2 to form a space 13 between the outer peripheral surfaces 11 of the well pipes 1. In the illustrated example, all the pillows 4 are filled. Although the water pipe 3 is used, a pillow material 4 which does not double as the water injection pipe 3 may be provided.

注水管３の周壁３１には、図６、及び図７に示すように、注水管３の長手方向に沿った等間隔ごとの位置で、井戸管１の略周方向に注入液を噴射すべく対向する一対のスリット状の注水口３ａ，３ａが穿設されている。井戸管１の外周面１１には、注水口３ａから噴射された注入液Ｗを井戸管１の平面視における外方へ変向させるリブ状の変向体１５が井戸管１の長手方向に延びるよう設けられている。   As shown in FIGS. 6 and 7, the peripheral wall 31 of the water injection pipe 3 is configured to inject the injection liquid substantially in the circumferential direction of the well pipe 1 at positions at regular intervals along the longitudinal direction of the water injection pipe 3. A pair of slit-like water inlets 3a, 3a facing each other are formed. On the outer peripheral surface 11 of the well pipe 1, a rib-shaped turning body 15 for turning the injection liquid W injected from the water inlet 3 a outward in a plan view of the well pipe 1 extends in the longitudinal direction of the well pipe 1. It is provided as follows.

揚水ポンプ５は、図１に示すように、井戸管１の内部を垂下する揚水管５１の下端に吊設され、地下水流入孔１ａ，１ａ，…を介して井戸管１内に流入した地下水を汲み揚げて、揚水管５１、ゲートバルブ５２、チャッキバルブ５３を介して、不図示のノッチタンクに貯留するよう構成されている。   As shown in FIG. 1, the pump 5 is suspended from the lower end of a pumping pipe 51 which hangs down the inside of the well pipe 1, and drains the groundwater flowing into the well pipe 1 through the groundwater inflow holes 1 a, 1 a,. The pump is pumped up and stored in a notch tank (not shown) via a water pump 51, a gate valve 52, and a check valve 53.

分配器６は、フランジ材６１に、扁平円筒状の蓋部材６２を被せてボルトナットで連結し、内部に円環上の空間からなる分配室６３を形成している。分配器６には、送液管７から分岐した送液枝管７１が、蓋部材６２の天壁を貫通するようにして連結されている。第１実施形態では、分配器６は、ストレーナ２の上端に隣接して設けられ、地中に埋設される。このように分配器６を地中に埋設することで、注水管３、及び井戸管１を短くすることができる。
ただし、分配器６の形状は、これに限られるものではなく、適宜の形状を採用できる。第２実施形態の分配器２０６についても同様である。 The distributor 6 has a flange member 61 covered with a flat cylindrical lid member 62 and connected with bolts and nuts to form a distribution chamber 63 having a ring-shaped space therein. A liquid feed branch pipe 71 branched from the liquid feed pipe 7 is connected to the distributor 6 so as to penetrate the top wall of the lid member 62. In the first embodiment, the distributor 6 is provided adjacent to the upper end of the strainer 2 and is buried underground. By burying the distributor 6 in the ground as described above, the water injection pipe 3 and the well pipe 1 can be shortened.
However, the shape of the distributor 6 is not limited to this, and an appropriate shape can be adopted. The same applies to the distributor 206 of the second embodiment.

送液枝管７１から分配器６へ注入液を流送する出口７１ａは、注入液Ｗを分配器６の周方向の下流側（図５（ａ）の側）へ噴出すべく斜めに切断されている。蓋部材６２の内周面６２ａには、この出口７１ａから分配室６３内に流入した注入液Ｗを満遍なく各注水管３へ分配するための３種の変向板６４，６５，６６が設けられている。   An outlet 71a for flowing the injection liquid from the liquid feed branch pipe 71 to the distributor 6 is cut obliquely so as to jet the injection liquid W to the downstream side in the circumferential direction of the distributor 6 (the side in FIG. 5A). ing. The inner peripheral surface 62a of the lid member 62 is provided with three types of deflection plates 64, 65, and 66 for uniformly distributing the infusate W flowing into the distribution chamber 63 from the outlet 71a to the water injection pipes 3. ing.

変向板６４、及び変向板６５は、共に帯状の板材からなる。
変向板６４は、図５（ａ）に示すように、井戸管１の軸心方向に対し略６０度傾斜させた状態で、蓋部材６２の内周面６２ａの下半部分において、相隣る注水管３，３の間の位置で内周面６２ａに貼設されている。
変向板６５は、内周面６２ａの上端部における出口７１ａの下流側近傍で、内周面６２ａの周方向に延びるよう貼設されている。 The deflecting plate 64 and the deflecting plate 65 are both formed of strip-shaped plate members.
As shown in FIG. 5A , the deflection plate 64 is adjacent to the lower half of the inner peripheral surface 62a of the lid member 62 in a state where the deflection plate 64 is inclined by approximately 60 degrees with respect to the axial direction of the well tube 1. At the position between the water injection pipes 3 and 3.
The deflecting plate 65 is affixed so as to extend in the circumferential direction of the inner peripheral surface 62a near the downstream of the outlet 71a at the upper end of the inner peripheral surface 62a.

変向板６６は、二等辺三角形の板材からなり、出口７１ａの周方向の上流側（図６（ａ）における右側）における出口７１ａ近傍で、頂点を当該上流側に向け蓋部材６２の天壁内面６２ｂに貼設されている。   The diverting plate 66 is made of an isosceles triangular plate material, and the top wall of the lid member 62 has its vertex directed toward the upstream in the vicinity of the outlet 71a on the upstream side in the circumferential direction of the outlet 71a (right side in FIG. It is stuck on the inner surface 62b.

（第２実施形態）
図８、及び図９は、本発明の第２実施形態に係る注水管付揚水井２００を示している。
注水管付揚水井２００は、地上に設けられる分配器２０６を備えている。これに伴い注水管２０３，２０３，…は、上端が地上にまで延出している。また、井戸管１とストレーナ２の間の空間１３の上端は、フランジ材６１とは、別途のフランジ材２３により閉塞されている。フランジ材２３は、注水管２０３を挿通する挿通向２３ａを備えている。井戸管１は、ストレーナ２を囲繞する部分２１７が、砂や珪砂からなるフィルタ材で埋められ、ストレーナ２で覆われずに注水管２０３がむき出しとなるフランジ材２３と地表の間の部分は、コンクリート２１８を打設することで、注水管２０３を防護している。
尚、注水管２０３は、ストレーナ２を支持する枕材２０４を兼ねている。
このように、分配器２０６を地上に設けることで、分配器２０６のメンテナンスを容易に行うことができる。 (2nd Embodiment)
FIG. 8 and FIG. 9 show a pumping well 200 with an injection pipe according to a second embodiment of the present invention.
The pumping well 200 with a water injection pipe includes a distributor 206 provided on the ground. Along with this, the upper ends of the water injection pipes 203 extend to the ground. Further, the upper end of the space 13 between the well pipe 1 and the strainer 2 is closed by the flange member 23 separate from the flange member 61. The flange member 23 has an insertion direction 23a through which the water injection pipe 203 is inserted. In the well pipe 1, a portion 217 surrounding the strainer 2 is filled with a filter material made of sand or silica sand, and a portion between the flange material 23 and the ground surface where the water injection pipe 203 is exposed without being covered with the strainer 2 is By pouring the concrete 218, the water injection pipe 203 is protected.
Note that the water injection pipe 203 also serves as a pillow material 204 that supports the strainer 2.
Thus, by providing the distributor 206 on the ground, maintenance of the distributor 206 can be easily performed.

注水管付揚水井１００，２００を用いて、揚水を行う際には、まず、不図示の真空ポンプを起動して、井戸管１内部を減圧する。すると、周辺地盤の地下水が、地下水の自重と井戸管内部の負圧によりストレーナ２、及び地下水流入孔１ａを介して井戸管１の内部へ流入する。井戸管１内に十分に地下水が溜まったら、揚水ポンプ５を起動して、地下水を汲み上げる。   When pumping water using the pumping wells 100 and 200 with water injection pipes, first, a vacuum pump (not shown) is activated to depressurize the inside of the well pipe 1. Then, groundwater in the surrounding ground flows into the well pipe 1 through the strainer 2 and the groundwater inflow hole 1a due to the weight of the groundwater and the negative pressure inside the well pipe. When the groundwater is sufficiently accumulated in the well pipe 1, the pump 5 is started to pump up the groundwater.

次に、周辺地盤へ、ファインバブル水等の注入液Ｗを注入する際は、不図示の加圧ポンプにより、送液管７へ注入液Ｗを流送する。送液管７に流送された注入液Ｗのうち、一部は、送液枝管７１を介して分配器６，２０６へ流送され、残部は送液枝管７２を介して、井戸管１の内部へ流送される。   Next, when injecting the injection liquid W such as fine bubble water into the surrounding ground, the injection liquid W is sent to the liquid sending pipe 7 by a pressure pump (not shown). A part of the infusion liquid W sent to the liquid sending pipe 7 is sent to the distributors 6 and 206 via the liquid sending branch pipe 71, and the remainder is supplied to the well pipe via the liquid sending branch pipe 72. 1 inside.

分配器６，２０６へ流送された注入液Ｗは、送液枝管７１の出口７１ａから分配室６３に流入し、変向板６４，６５，６６により案内されながら、各注水管３，２０３に満遍なく流送される。ここで、変向板６５は、注入液Ｗを円環状の分配室６３内で回流するよう案内し、変向板６４は、分配室６３内を回流する注入液Ｗを注水管３，２０３へ流入するよう案内する。また、変向板６６は、回流する注入液Ｗが、送液枝管７１に衝突して発生する乱流を回避する。   The injection liquid W sent to the distributors 6 and 206 flows into the distribution chamber 63 from the outlet 71a of the liquid supply branch pipe 71, and is guided by the diverting plates 64, 65 and 66, while being supplied to the respective injection pipes 3 and 203. To be evenly distributed. Here, the diverting plate 65 guides the infusion liquid W to circulate in the annular distribution chamber 63, and the diverting plate 64 directs the infusion liquid W circulating in the distribution chamber 63 to the injection pipes 3 and 203. Guide the inflow. In addition, the diverting plate 66 avoids the turbulent flow generated by the circulated injection liquid W colliding with the liquid feed branch pipe 71.

注水管３，２０３に流送された注入液Ｗは、注水口３ａから井戸管１とストレーナ２の間の空間１３に噴射され、変向体１５により外向きに変向されて、周囲の地盤へ注入される。図６に示すように、変向体１５は、相隣る注水管３，３の中間に設けられているので、相隣る注水管３，３の注水口３ａ，３ａから噴射された注入液Ｗが互いに干渉することを抑制できる。   The injection liquid W sent to the water injection pipes 3 and 203 is injected from the water injection port 3 a into the space 13 between the well pipe 1 and the strainer 2, is turned outward by the turning body 15, and is turned into the surrounding ground. Injected into As shown in FIG. 6, since the turning body 15 is provided in the middle of the adjacent water injection pipes 3, 3, the injection liquid injected from the water injection ports 3a, 3a of the adjacent water injection pipes 3, 3 is provided. W can be prevented from interfering with each other.

一方、井戸管１内部へ流送された注入液Ｗは、地下水流入孔１ａ，１ａ，…、及びストレーナ２の通水部２１から周囲の地盤へ注入される。井戸管１の内部へ流送された注入液Ｗのうち、余剰の注入液Ｗは、リターン管８を介して、還流される。   On the other hand, the injection liquid W sent into the inside of the well pipe 1 is injected into the surrounding ground from the groundwater inflow holes 1a, 1a,. Of the infusate W sent into the well tube 1, excess infusate W is returned via the return tube 8.

注水管付揚水井１００，２００は、ストレーナ２を支持する枕材４，２０４が、注水管３，２０３を兼ねるため、注水管を設けるための新たな工数を要することなく設置することができる。   Since the pillows 4, 204 supporting the strainer 2 also serve as the water injection pipes 3, 203, the pumping wells 100, 200 with water injection pipes can be installed without requiring additional man-hours for providing the water injection pipes.

また、注水管付揚水井１００，２００は、複数の注水管３，２０３へ注入液Ｗを分配する分配器６，２０６を設けたので、各注水管３，２０３へ、均等に注入液Ｗを注入することができる。   Further, since the pumping wells 100 and 200 with the water injection pipes are provided with the distributors 6 and 206 for distributing the injection liquid W to the plurality of water injection pipes 3 and 203, the injection liquid W is evenly distributed to each of the water injection pipes 3 and 203. Can be injected.

本発明は、上述した実施形態に限らず、ストレーナを備える揚水井であればよく、井戸管内を減圧する真空ポンプは備えなくともよい。また、本発明は、井戸管の地下水流入孔から地盤中へ注入液Ｗを注入するように構成されていなくともよい。   The present invention is not limited to the above-described embodiment, but may be any pumping well provided with a strainer, and may not include a vacuum pump for reducing the pressure in the well pipe. Further, the present invention may not be configured to inject the injection liquid W into the ground from the groundwater inflow hole of the well pipe.

あるいは、図１０に示した注水管付揚水井３００のように、注水管は１本だけでも足り、注水管への送水は、分配器を介さず送水管３０７から直接、注水管３０３（枕材３０４）へ行うようにしてもよい。ストレーナは、線材を巻いたコイル状のものに限らず、パンチングボードのような板材に設けた貫通孔を通水部とするものでもよく、この場合、注水管兼枕材を井戸管に巻回した１本の管材により構成してもよい。 Alternatively, as in the pumping well 300 with a water injection pipe shown in FIG. 10 , only one water injection pipe is sufficient, and water is supplied to the water injection pipe directly from the water supply pipe 307 without using a distributor. 304). The strainer is not limited to a coil-shaped wire wound wire, but may be a through hole provided in a plate material such as a punching board, and may be a water passage part.In this case, a water injection pipe and a pillow material are wound around a well pipe. It may be constituted by a single tube material.

注入液は、液状化防止を目的として、ファインバブル水や空気と水の混合水、地盤固化材等の地盤改良材を含んだ液体等を注入するものに限らず、揚水工事に伴う地盤沈下や井戸水の枯渇防止を目的として、単なる地下水を還流するものであってもよい。   For the purpose of preventing liquefaction, the injection liquid is not limited to injection of liquid containing ground improvement material such as fine bubble water, mixed water of air and water, soil solidification material, etc. For the purpose of preventing well water from being depleted, a simple reflux of groundwater may be used.

１００，２００，３００ 注水管付揚水井
１ 井戸管
１１ 外周面
１５ 変向体
２ ストレーナ
２１ 通水部
３，２０３，３０３ 注水管
３ａ 注水口
３１ 注水管の周壁
４，２０４，３０４ 枕材
６，２０６ 分配室 100, 200, 300 Pumping well with injection pipe 1 Well pipe 11 Outer peripheral surface 15 Deflector 2 Strainer 21 Water inlet 3, 203, 303 Water injection pipe 3a Water injection port 31 Peripheral wall of water injection pipe 4, 204, 304 Pillow material 6, 206 Distribution room

Claims (6)

地中へ液体を注入する注水管を備えた注水管付揚水井であって、
地中に垂設されるとともに周壁に地下水流入孔を有する井戸管と、
前記井戸管に環装されるとともに地下水を通す通水部を有するストレーナと、
前記井戸管の外周面と前記ストレーナに挟設されて前記ストレーナを支持する少なくとも１本の棒材、又は管材からなる枕材と
を備え、
前記枕材は、少なくとも１本が注水管を兼ねて液体を噴射する注水口を備えることを特徴とする注水管付揚水井。 A pumping well with a water injection pipe having a water injection pipe for injecting liquid into the ground,
A well pipe which is vertically installed in the ground and has a groundwater inflow hole in a peripheral wall;
A strainer fitted around the well pipe and having a water passage for passing groundwater;
An outer peripheral surface of the well tube and at least one bar member sandwiched between the strainers and supporting the strainer, or a pillow member made of a tube material,
The pumping well with a water supply pipe, wherein at least one of the pillows is provided with a water injection port which also serves as a water injection pipe and injects a liquid. 前記注水口は、前記井戸管と前記ストレーナの間の空間に液体を噴射する請求項１に記載の注水管付揚水井。   The pumping well with a water injection pipe according to claim 1, wherein the water injection port injects a liquid into a space between the well pipe and the strainer. 前記注水口から液体が噴射される方向において、前記井戸管の外周面に突設される変向体を有する請求項２に記載の注水管付揚水井。   The pumping well with a water injection pipe according to claim 2, further comprising a diverting body projecting from an outer peripheral surface of the well pipe in a direction in which the liquid is jetted from the water injection port. 前記枕材を複数本備え、前記複数の枕材のうち２以上の枕材が注水管を兼ねており、
当該２以上の注水管を上端で連結する分配室を有する請求項１から請求項３のいずれか１項に記載の注水管付揚水井。 A plurality of the pillows are provided, and two or more pillows among the plurality of pillows also serve as water injection pipes,
The pumping well with a water injection pipe according to any one of claims 1 to 3, further comprising a distribution chamber connecting the two or more water injection pipes at an upper end. 前記分配室が地中に設けられる請求項４に記載の注水管付揚水井。   The pumping well with a water injection pipe according to claim 4, wherein the distribution chamber is provided underground. 前記分配室が地表に設けられる請求項４に記載の注水管付揚水井。   The pumping well with a water injection pipe according to claim 4, wherein the distribution chamber is provided on the surface of the ground.
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