JP2012062752A - Well construction method - Google Patents
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- JP2012062752A JP2012062752A JP2011255060A JP2011255060A JP2012062752A JP 2012062752 A JP2012062752 A JP 2012062752A JP 2011255060 A JP2011255060 A JP 2011255060A JP 2011255060 A JP2011255060 A JP 2011255060A JP 2012062752 A JP2012062752 A JP 2012062752A
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- 238000010276 construction Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims description 9
- 239000004576 sand Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 abstract description 55
- 239000010959 steel Substances 0.000 abstract description 55
- 239000002689 soil Substances 0.000 abstract description 6
- 239000004744 fabric Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 239000003673 groundwater Substances 0.000 description 9
- 239000004927 clay Substances 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 229920001875 Ebonite Polymers 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
本発明は、汚染された土壌の地下水の調査や、土壌を浄化する工法などに使用される井戸の構築方法に関するものである。 The present invention relates to a method for constructing a well used for investigation of groundwater in contaminated soil, a method for purifying soil, and the like.
従来、地中の地下水を採取したり、地中の気体を吸引したり、または地中に空気を送り込んだりするために、井戸を構築することが知られている。例えば、このような井戸は、ボーリングマシンで削孔したケーシング孔に、孔の直径より一回り小さい直径の井戸管を建て込み、その井戸管と孔壁との間には砂などのろ過材料を充填し、最後にケーシングを引き抜いて構築する。 Conventionally, it is known to construct a well in order to collect underground water in the ground, suck gas in the ground, or send air into the ground. For example, in such a well, a well pipe having a diameter slightly smaller than the diameter of the hole is installed in a casing hole drilled by a boring machine, and a filtering material such as sand is placed between the well pipe and the hole wall. Fill and finally pull out the casing and build.
この井戸管は、地下水を採取したい深さの管壁に孔あるいは開口部（ストレーナ）が形成されており、地中から孔に流れ込んだ地下水は、ろ過材料によって土砂などの侵入が阻止されて、地下水のみがストレーナを通って井戸管の内部に流れ込むようになっている。 In this well pipe, a hole or opening (strainer) is formed in the pipe wall at a depth where it is desired to collect groundwater. Only groundwater flows through the strainer and into the well pipe.
しかしながらこのような井戸の構築方法は、孔を掘削した後に井戸管の建て込み、ろ過材の充填、ケーシングの引き抜きなど工程が多くなるので手間がかかるうえに、使用部材が多いのでコストが高くなる傾向にある。また、上部の井戸管と孔壁との間に固化材が充填されるので、井戸管を引き抜いて回収することが難しい。 However, such a well construction method requires many steps such as the construction of a well pipe, the filling of a filter medium, and the extraction of a casing after excavation of a hole. There is a tendency. Moreover, since the solidification material is filled between the upper well pipe and the hole wall, it is difficult to pull out and collect the well pipe.
他方、特許文献１には、外周に複数のスリットが形成されたスクリーン管を備えた特殊な井戸用管を、クローラ式の打込み機で地中に打ち込んで井戸を構築する方法が開示されている。この方法は、井戸用管を地中に打ち込むことで井戸を構築することができるので、作業時間が短くて済むうえに、井戸を使用した後に井戸用管を引き抜いて回収することが容易にできる。 On the other hand, Patent Document 1 discloses a method for constructing a well by driving a special well pipe having a screen pipe having a plurality of slits formed on the outer periphery thereof into the ground with a crawler type driving machine. . In this method, since a well can be constructed by driving the well pipe into the ground, the work time can be shortened, and the well pipe can be easily pulled out and collected after the well is used. .
この特許文献１に開示された井戸用管は、打ち込み中にシルトや粘土がスクリーン管の内部に侵入して採水部が詰まるのを防ぐために、矩形状のスリットを設けた外管と、円形孔を設けた内管と、外管と内管との間に介在させる網部との三重構造となっている。 The well pipe disclosed in Patent Document 1 includes an outer pipe provided with a rectangular slit, and a circular shape in order to prevent silt and clay from entering the inside of the screen pipe and clogging the water sampling section during driving. It has a triple structure of an inner pipe provided with a hole and a net portion interposed between the outer pipe and the inner pipe.
しかしながら、三重構造の井戸用管は、管の肉厚が厚くなるので内径が小さくなり、集水効率が低下するという問題がある。また、大きな内径を確保すると外径も大きくなるので、大型の打込み機が必要になる。 However, the triple well pipe has a problem in that the inner diameter is reduced because the thickness of the pipe is increased, and the water collection efficiency is lowered. Further, if a large inner diameter is ensured, the outer diameter also increases, so a large driving machine is required.
また、内径が小さくなると、汎用されている採水器やセンサなどを管内に挿入できなくなるおそれがある。 Further, when the inner diameter is reduced, there is a possibility that a commonly used water sampler or sensor cannot be inserted into the pipe.
さらに、外管と内管にはそれぞれ別の形状の孔が設けられており、それらの孔を通って地下水が流れ込むことになるので、水みちに障害が多く、集水性能が低下するおそれがある。 Furthermore, the outer pipe and the inner pipe are provided with holes of different shapes, and groundwater will flow through these holes, so there are many obstacles in the water path, and the water collection performance may be reduced. is there.
また、外管のスリットが目詰まりした場合に、内径が小さいと洗浄用のブラシが挿入し難くなるばかりか、内管の外側にある外管の孔にまでブラシの毛先が届かないので、ブラシで目詰まりしたシルトや粘土を取り除くことができない。 In addition, when the slit of the outer tube is clogged, if the inner diameter is small, it is difficult to insert the brush for cleaning, and the brush tip does not reach the hole of the outer tube outside the inner tube. You cannot remove silt and clay clogged with a brush.
さらに、内管に高圧洗浄水を送って洗浄する場合でも、内管の孔を通して外管側に洗浄水が流れることになるので、スリットに詰まったシルトや粘土を洗い流す力が弱く、効果的な井戸内洗浄がおこなえないおそれがある。 Furthermore, even when high pressure cleaning water is sent to the inner pipe for cleaning, the cleaning water flows to the outer pipe side through the hole in the inner pipe, so the ability to wash off silt and clay clogged in the slit is weak and effective. There is a risk that wells cannot be washed.
そこで、本発明は、目詰まりさせることなく簡単に構築できる井戸の構築方法を提供することを目的としている。 Therefore, an object of the present invention is to provide a well construction method that can be easily constructed without clogging.
前記目的を達成するために、本発明の井戸の構築方法は、外周に複数の開口部が形成されて内外が連通された有孔管材を地中に打ち込んでおこなう井戸の構築方法であって、前記有孔管材の内部に土砂の侵入を阻止する布状フィルタ材を詰め込んで前記開口部を閉塞し、前記開口部を閉塞した状態で前記有孔管材を地中に打ち込むことを特徴とする。 In order to achieve the above object, the well construction method of the present invention is a well construction method in which a plurality of openings are formed on the outer periphery and a perforated pipe material in which the inside and outside are communicated is driven into the ground, The porous tube material is filled with a cloth-like filter material that prevents intrusion of earth and sand to close the opening, and the porous tube material is driven into the ground with the opening being closed.
このように構成された本発明の井戸の構築方法は、有孔管材の内部に閉塞手段を配置し、その閉塞手段によって開口部を閉塞した状態で地中に有孔管材を打ち込む。 In the well construction method of the present invention thus configured, the closing means is disposed inside the perforated pipe material, and the perforated pipe material is driven into the ground in a state where the opening is closed by the closing means.
すなわち、シルトや粘土などが開口部を通って有孔管材の内部に入り込もうとしても、閉塞手段によって阻止されるので、有孔管材の内部がシルトや粘土などによって詰まってしまうことがなく、高い集水能力を確保できる。 That is, even if silt or clay tries to enter the inside of the perforated pipe material through the opening, it is blocked by the closing means, so that the inside of the perforated pipe material is not clogged with silt or clay and is high. Can secure water collection capacity.
また、空気などの気体を透過させるための井戸であれば、開口部を有孔管材の内部に詰め込んだ布状フィルタ材で閉塞して土砂の侵入を阻止し、その布状フィルタ材を取り除くことなくそのまま井戸として使用することができる。 In addition, if it is a well that allows gas such as air to permeate, the opening is blocked with a cloth filter material packed in a perforated tube material to prevent intrusion of earth and sand, and the cloth filter material is removed. It can be used as a well as it is.
以下、本発明の実施の形態について図面を参照して説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
本実施の形態の井戸の構築方法によって構築される井戸は、地中に有孔管材としての先端有孔鋼管１を打ち込むことで構築される井戸である。この井戸は、調査などの目的で地中の地下水を採取するための観測井戸として使用したり、汚染された土壌に含まれる有害ガスを吸い取るための気体吸引井戸として使用したり、地中に空気を圧入するためのスパージング井戸として使用したり、地中に水や薬液などの液体を注入する液体注入井戸として使用したり、揚水井戸として使用したりすることができる。 The well constructed by the well construction method of the present embodiment is a well constructed by driving the tip perforated steel pipe 1 as a perforated pipe material into the ground. This well can be used as an observation well for collecting underground groundwater for survey purposes, as a gas suction well for absorbing harmful gases contained in contaminated soil, It can be used as a sparging well for injecting water, used as a liquid injection well for injecting liquids such as water and chemicals into the ground, and used as a pumping well.
この先端有孔鋼管１は、図１に示すように、外周に複数の開口部としてのスリット１１，・・・が設けられており、そのスリット１１によって内外が連通して地下水やガスを内部に取り込んだり、水や空気を地中に送り込んだりすることができる。 As shown in FIG. 1, the tip perforated steel pipe 1 is provided with slits 11,... As a plurality of openings on the outer periphery, and the slits 11 communicate with the inside and outside to bring groundwater and gas into the interior. You can take it in or send water and air into the ground.
この先端有孔鋼管１は、下向き円錐状の先端部１ａと、その上方に形成される円筒形の先端側無孔部１ｃと、さらにその上方に形成されるスリット１１，・・・を設けたスクリーン部１ｂと、その上に形成される図２に示すような円筒形の上側無孔部１ｄとを有している。 The tip perforated steel pipe 1 is provided with a downward conical tip portion 1a, a cylindrical tip-side non-hole portion 1c formed thereabove, and a slit 11 formed above the tip portion. It has a screen portion 1b and a cylindrical upper non-hole portion 1d formed thereon as shown in FIG.
この先端部１ａは、小型のクローラ式のボーリングマシン（図示せず）による押圧によっても先端有孔鋼管１を地中に押し込めるように、先端が尖った形状に形成されている。また、先端部１ａは、打ち込み時に他の個所よりも大きな力が作用するので、強度の高い材料で形成する。 The tip portion 1a is formed in a sharp shape so that the tip perforated steel pipe 1 can be pushed into the ground even by pressing with a small crawler type boring machine (not shown). Further, the tip portion 1a is made of a material having a high strength because a larger force acts than other portions when driven.
また、この先端有孔鋼管１は、長尺状の中空部材であって先端がこの先端部１ａによって塞がれており、管内に侵入した土砂や異物を先端部１ａや先端側無孔部１ｃ内に堆積させることができる。 Moreover, this front-end | tip porous steel pipe 1 is a long hollow member, and the front-end | tip is obstruct | occluded by this front-end | tip part 1a, and the front-end | tip part 1a and the front-end | tip non-porous part 1c Can be deposited inside.
さらに、スクリーン部１ｂに設けられるスリット１１，・・・は、地下水などを採取したい範囲に間隔をおいて複数形成される。このスリット１１は、土砂などの大きな異物の侵入を阻止し、水や空気の通過に支障とならない大きさに形成される。 Further, a plurality of slits 11,... Provided in the screen portion 1 b are formed at intervals in a range where groundwater or the like is to be collected. The slit 11 is formed in a size that prevents entry of large foreign matters such as earth and sand and does not hinder the passage of water or air.
また、スクリーン部１ｂの上方に形成される上側無孔部１ｄの上端には、後述する継足し鋼管５を接続するためのねじ溝が刻設されている。 Further, a screw groove for connecting a later-described additional steel pipe 5 is formed at the upper end of the upper non-hole portion 1d formed above the screen portion 1b.
例えば、先端有孔鋼管１には、内径40mm、外径48.6mm、肉厚3.5mmで長さが１ｍの鋼管が使用できる。そして、先端部１ａと先端側無孔部１ｃとを合わせた長さが約30cm、スクリーン部１ｂを約50cm、上側無孔部１ｄを約20cmにすることができる。また、スリット１１は、長さ50mm、幅2mmの長方形状の開口として千鳥配置で設け、先端有孔鋼管１の所定の強度を維持できるようにする。 For example, a steel tube having an inner diameter of 40 mm, an outer diameter of 48.6 mm, a wall thickness of 3.5 mm, and a length of 1 m can be used for the tip perforated steel pipe 1. The combined length of the tip portion 1a and the tip-side non-hole portion 1c can be about 30 cm, the screen portion 1b can be about 50 cm, and the upper non-hole portion 1d can be about 20 cm. The slits 11 are provided in a staggered arrangement as rectangular openings with a length of 50 mm and a width of 2 mm so that the predetermined strength of the perforated steel pipe 1 can be maintained.
さらに、この先端有孔鋼管１のスクリーン部１ｂの内周には、図１に示すように、膜状フィルタ材として金網フィルタ２を配設する。この金網フィルタ２は、金属製の筒状網材で、スリット１１を通過した土砂が管内に侵入するのを阻止するストレーナとしての機能を有している。 Further, as shown in FIG. 1, a wire mesh filter 2 is disposed on the inner periphery of the screen portion 1b of the tip perforated steel pipe 1 as a membrane filter material. The wire mesh filter 2 is a metal cylindrical mesh material, and has a function as a strainer for preventing earth and sand that has passed through the slit 11 from entering the pipe.
また、この金網フィルタ２は、全体は図示しないが、スクリーン部１ｂの内周にのみ配設されるものであってもよいし、その上下に先端有孔鋼管１の内周形状と同じ形状の部材を形成したものであってもよい。 Moreover, although this wire mesh filter 2 is not shown in its entirety, it may be disposed only on the inner periphery of the screen portion 1b, and has the same shape as the inner periphery shape of the tip perforated steel pipe 1 above and below it. A member may be formed.
そして、この金網フィルタ２の内部には、図１に示すようなパッカー３を閉塞手段として配置する。この図１のパッカー３は、膨張してスリット１１を閉塞している状態を示し、図２のパッカー３は収縮している状態を示している。 A packer 3 as shown in FIG. 1 is arranged as a closing means inside the wire mesh filter 2. The packer 3 in FIG. 1 shows a state where the slit 11 is expanded and closed, and the packer 3 in FIG. 2 shows a state where the slit 11 is contracted.
このパッカー３は、図２に示すように、膨張したり収縮したりと膨縮自在な袋状部３１と、その袋状部３１の内部に空気等の流体を注入したり、抜き出したりするための長尺中空部材としての支持中空管３２とを有している。 As shown in FIG. 2, the packer 3 is a bag-like portion 31 that can be expanded and contracted, and a fluid such as air is injected into or extracted from the bag-like portion 31. And a supporting hollow tube 32 as a long hollow member.
この袋状部３１は、スクリーン部１ｂの長さよりも長い円筒状の伸縮部材又は可撓性部材で、硬質ゴムなどで形成することができる。この袋状部３１の材質は、内部に充填する流体が漏れ出さないものであればよい。また、その長さは、例えばスクリーン部１ｂを50 cmとすると、袋状部３１は60 〜 70 cm程度の長さにする。 The bag-like portion 31 is a cylindrical elastic member or a flexible member that is longer than the length of the screen portion 1b, and can be formed of hard rubber or the like. The material of this bag-shaped part 31 should just be a thing which the fluid with which an inside is filled does not leak. For example, if the screen portion 1b is 50 cm, the bag-like portion 31 has a length of about 60 to 70 cm.
そして、本実施の形態では、袋状部３１を硬質ゴムで形成し、流体として空気を送り込む場合について説明する。 And this Embodiment demonstrates the case where the bag-shaped part 31 is formed with hard rubber, and air is sent as a fluid.
一方、支持中空管３２は、袋状部３１に空気を送り込むための管材で、先端（打ち込み時の下端）は袋状部３１の上部口３１１に接続され、後端（打ち込み時の上端）には空気弁付き接続口３２１が設けられる。 On the other hand, the support hollow tube 32 is a tube material for sending air into the bag-shaped portion 31, and the tip (lower end when driven) is connected to the upper port 311 of the bag-shaped portion 31, and the rear end (upper end when driven). Is provided with a connection port 321 with an air valve.
この空気弁付き接続口３２１は、別の支持中空管３２が接続されると内部の空気が通り、接続されていないときには空気の漏出を防ぐ特殊バルブ構造の空気弁を備えている。 The connection port 321 with an air valve includes an air valve having a special valve structure that prevents internal air leakage when another support hollow tube 32 is connected and prevents air leakage when the support hollow tube 32 is not connected.
さらにこの支持中空管３２は、収縮時に袋状部３１を吊り下げて支持しておくだけの強度を備えている。例えば、直径が10〜15 mm程度の鋼管が使用できる。 Further, the support hollow tube 32 has a strength sufficient to suspend and support the bag-like portion 31 when contracted. For example, a steel pipe having a diameter of about 10 to 15 mm can be used.
次に、井戸の構築方法について、図３，４を参照しながら説明する。 Next, a well construction method will be described with reference to FIGS.
まず、図３（ａ）に示すように先端有孔鋼管１を１本、準備する。この先端有孔鋼管１の内部には図３（ｂ）に示すように収縮した状態の袋状部３１を挿入する。 First, as shown in FIG. 3 (a), one tip perforated steel pipe 1 is prepared. A bag-like portion 31 in a contracted state is inserted into the tip perforated steel pipe 1 as shown in FIG.
この袋状部３１は、上部に接続された支持中空管３２によって所定の位置に吊り下げられ、その支持中空管３２の上端の空気弁付き接続口３２１にはホース３４を介して手動式のピストンポンプ３３が接続される。 The bag-like portion 31 is suspended at a predetermined position by a support hollow tube 32 connected to the upper portion, and is manually operated via a hose 34 to the connection port 321 with an air valve at the upper end of the support hollow tube 32. The piston pump 33 is connected.
そして、このピストンポンプ３３のピストンを作動させると、空気がホース３４を通って支持中空管３２に流れ込み、そこから袋状部３１の内部に注入された空気によって図３（ｃ）に示すように袋状部３１が膨張し、スリット１１，・・・が閉塞される。 When the piston of the piston pump 33 is operated, air flows into the support hollow tube 32 through the hose 34, and as shown in FIG. 3 (c) by the air injected into the bag-like portion 31 from there. The bag-like portion 31 expands and the slits 11 are closed.
このように袋状部３１が先端有孔鋼管１の内部を隙間無く埋めるように膨張した状態であれば、袋状部３１は金網フィルタ２を介してスクリーン部１ｂの内周に押し付けられているので、支持中空管３２による支持を解除しても落下することなく所定の位置に留まることになる。また、ホース３４を外しても、空気弁付き接続口３２１の空気弁が作動して、袋状部３１に充填された空気が漏れ出すことはない。 Thus, if the bag-like part 31 is in an expanded state so as to fill the inside of the tip perforated steel pipe 1 without a gap, the bag-like part 31 is pressed against the inner periphery of the screen part 1b through the wire mesh filter 2. Therefore, even if the support by the support hollow tube 32 is released, it remains in a predetermined position without dropping. Moreover, even if the hose 34 is removed, the air valve of the connection port 321 with the air valve is operated, and the air filled in the bag-shaped portion 31 does not leak out.
続いて、クローラによる移動が可能な打込み式ボーリングマシン（図示せず）の打込み部に打込み管頭部材４を取り付け、そこに先端有孔鋼管１の頭部を接続し、図３（ｄ）に示すように地盤Ｇに向けて打ち込みを開始する。なお、地表近くに砕石を含む埋め戻し土や舗装がある場合は、予めケーシング掘りなどによって原地盤までの掘削をおこなう。 Subsequently, a driving tube head member 4 is attached to a driving portion of a driving type boring machine (not shown) that can be moved by a crawler, and the head of the tip perforated steel tube 1 is connected thereto, as shown in FIG. As shown, driving toward the ground G is started. If there is backfill soil or pavement containing crushed stone near the ground surface, excavation to the original ground is performed in advance by casing digging.
この先端有孔鋼管１の打ち込みは、地盤Ｇから先端有孔鋼管１の上部が少し突出した状態になるまでおこない、その時点で一旦、打ち込みを停止して打込み管頭部材４を先端有孔鋼管１の上端から切り離す。 The tip perforated steel pipe 1 is driven until the upper portion of the tip perforated steel pipe 1 protrudes slightly from the ground G. At that point, the driving is stopped and the head part 4 is inserted into the tip perforated steel pipe. Disconnect from the top of 1.
そして、先端有孔鋼管１の上端に、図４（ａ）に示すように、継足し鋼管５を接続する。この継足し鋼管５は、外周に開口部が形成されていない筒状の鋼管で、内部には支持中空管３２が配設されている。 Then, an additional steel pipe 5 is connected to the upper end of the foraminous steel pipe 1 as shown in FIG. The additional steel pipe 5 is a cylindrical steel pipe with no opening formed on the outer periphery, and a support hollow pipe 32 is disposed inside.
この継足し鋼管５の接続は、内部の支持中空管３２の下端を、先端有孔鋼管１の空気弁付き接続口３２１に接続するとともに、継足し鋼管５の下端を先端有孔鋼管１の上端に接続することによっておこなう。ここで、先端有孔鋼管１と継足し鋼管５との接続はねじ溝を介しておこなうことができ、繋ぎ目の外側から表面が滑らかな養生シールテープなどを貼り付けて止水処理をおこなう。 The connection of the additional steel pipe 5 is performed by connecting the lower end of the internal support hollow pipe 32 to the connection port 321 with the air valve of the front perforated steel pipe 1 and connecting the lower end of the additional steel pipe 5 to the front perforated steel pipe 1. This is done by connecting to the top edge. Here, the connection between the tip perforated steel pipe 1 and the additional steel pipe 5 can be made through a screw groove, and a water sealing treatment is performed by applying a curing seal tape or the like having a smooth surface from the outside of the joint.
また、この支持中空管３２，３２同士を接続した時点で、袋状部３１の空気圧が下がったときには、新たに接続した支持中空管３２の空気弁付き接続口３２１にホース３４を介してピストンポンプ３３を接続し、これを作動させて空気を充填して袋状部３１の内圧を上昇させる。 Further, when the air pressure of the bag-like portion 31 is reduced when the support hollow tubes 32 and 32 are connected to each other, the hose 34 is connected to the connection port 321 with an air valve of the newly connected support hollow tube 32. The piston pump 33 is connected and operated to fill the air and raise the internal pressure of the bag-like portion 31.
続いて、図４（ａ）に示すように、打込み管頭部材４を下げて新たに接続した継足し鋼管５の頭部に接続し、ボーリングマシンによる打ち込みを再開し、図４（ｂ）に示すように地盤Ｇから継足し鋼管５の上部が少し突出した状態で打ち込みを停止して打込み管頭部材４を切り離す。 Subsequently, as shown in FIG. 4 (a), the driving pipe head member 4 is lowered and connected to the head of the newly connected additional steel pipe 5, and driving by the boring machine is resumed. As shown, the driving is stopped while the upper portion of the steel pipe 5 is slightly protruded from the ground G, and the driving pipe head member 4 is separated.
以上の説明では、この時点で打ち込みを終了するが、更に深い位置まで先端有孔鋼管１を打ち込む場合は、更に継足し鋼管５を接続して打ち込む作業を繰り返す。 In the above description, the driving is finished at this point. However, when the tip perforated steel pipe 1 is driven to a deeper position, the work of connecting and driving the steel pipe 5 is repeated.
そして、打ち込みが終了したときに、図４（ｂ）に示すように、継足し鋼管５の上端から突出している支持中空管３２の空気弁付き接続口３２１にホース３４とピストンポンプ３３を繋ぎ、ピストンを作動させて袋状部３１の内部の空気を抜き出して収縮させる。 When the driving is finished, the hose 34 and the piston pump 33 are connected to the connection port 321 with the air valve of the support hollow tube 32 protruding from the upper end of the additional steel pipe 5 as shown in FIG. Then, the piston is operated to extract the air inside the bag-like portion 31 and contract it.
このようにして収縮した袋状部３１は、支持中空管３２を持ち上げることで、容易に先端有孔鋼管１及び継足し鋼管５の内部から取り出すことができる。 The bag-shaped portion 31 thus contracted can be easily taken out from the inside of the tip perforated steel pipe 1 and the additional steel pipe 5 by lifting the support hollow tube 32.
次に、井戸の構築方法の作用について説明する。 Next, the operation of the well construction method will be described.
このように構成された井戸の構築方法は、先端有孔鋼管１の内部にパッカー３を配置し、そのパッカー３の袋状部３１を膨張させてスリット１１，・・・を閉塞した状態で地中に先端有孔鋼管１を打ち込む。 The construction method of the well constructed in this manner is that the packer 3 is arranged inside the tip perforated steel pipe 1 and the bag-like portion 31 of the packer 3 is expanded to close the slits 11. The perforated steel pipe 1 is driven into the inside.
すなわち、シルトや粘土などがスリット１１を通って先端有孔鋼管１の内部に入り込もうとしても、袋状部３１によって阻止されるので、先端有孔鋼管１の内部がシルトや粘土などによって詰まってしまうことがなく、高い集水能力を確保できる。 That is, even if silt or clay tries to enter the inside of the tip perforated steel pipe 1 through the slit 11, it is blocked by the bag-like portion 31, so that the inside of the tip perforated steel pipe 1 is clogged with silt or clay. It is possible to secure a high water collection capacity.
また、打ち込み終了後に袋状部３１を収縮させて取り除くことで閉塞を解除すれば、スリット１１，・・・と金網フィルタ２を通って地下水が先端有孔鋼管１の内部に流れ込むことになるので、地下水を採取することができる。 Further, if the occlusion is released by shrinking and removing the bag-like portion 31 after the driving is completed, the groundwater will flow into the tip perforated steel pipe 1 through the slits 11,. Can collect groundwater.
このように、打ち込み終了後の洗浄作業が不要又は軽減できれば、汚染土壌に井戸を設けた場合に必要となる、井戸内から溢れ出る洗浄排水の処理を低減することができる。 Thus, if the cleaning operation after the completion of driving is unnecessary or can be reduced, it is possible to reduce the treatment of the cleaning waste water overflowing from the well, which is necessary when a well is provided in the contaminated soil.
さらに、打ち込み時や長時間の使用によってスリット１１，・・・が目詰まりした場合でも、ブラシを挿入して詰まっているシルトや粘土を取り除いたり、先端有孔鋼管１の内部に高圧洗浄水のホースを挿し込み、内部からスリット１１，・・・に向けて高圧水を送ったりすることで、容易に井戸内洗浄をおこなうことができる。 Further, even when the slits 11 are clogged when driven or used for a long time, the clogged silt or clay is removed by inserting a brush, or the high-pressure washing water is inserted into the tip perforated steel pipe 1. The inside of the well can be easily washed by inserting a hose and sending high pressure water from the inside toward the slits 11.
また、パッカー３は、袋状部３１とそれに空気等の流体を出し入れさせる支持中空管３２という簡単な構成にできるうえに、その支持中空管３２によって収縮時の袋状部３１を所定の位置に支持させることができる。さらに、支持中空管３２を地上に突出させることで、地上から容易に袋状部３１を膨張又は収縮させることができる。 In addition, the packer 3 can have a simple configuration of a bag-like portion 31 and a support hollow tube 32 through which a fluid such as air is taken in and out. Can be supported in position. Furthermore, the bag-shaped part 31 can be easily expanded or contracted from the ground by projecting the support hollow tube 32 to the ground.
また、先端有孔鋼管１の内周側に金網フィルタ２を配設することで、スリット１１，・・・を土砂が通過しても先端有孔鋼管１の内部に侵入することは阻止されるので、管内が土砂などで詰まることを防止できる。 Further, by arranging the wire mesh filter 2 on the inner peripheral side of the front end perforated steel pipe 1, even if earth and sand pass through the slits 11,. Therefore, the pipe can be prevented from being clogged with earth and sand.
さらに、先端有孔鋼管１のスクリーン部１ｂの下方に、先端側無孔部１ｃと先端部１ａとによって土砂溜まり部を設けることで、ある程度の土砂を堆積させてもスクリーン部１ｂの集水能力を低下させることがない。 Furthermore, by providing a sediment accumulation part below the screen part 1b of the tip perforated steel pipe 1 by the tip-side non-hole part 1c and the tip part 1a, the water collecting capacity of the screen part 1b even if a certain amount of sediment is deposited. Is not reduced.
また、金網フィルタ２のように肉厚の薄いフィルタ材が先端有孔鋼管１の内部に配設されるだけなので、管の内径が小さくなって集水能力を低下させることがない。 Further, since a thin filter material such as the wire mesh filter 2 is merely disposed inside the tip perforated steel pipe 1, the inner diameter of the pipe is reduced and the water collecting ability is not reduced.
以下、この実施例では、本発明の実施の形態について説明する。なお、前記実施の形態で説明した内容と同一乃至均等な部分の説明については同一用語や同一符号を付して説明する。 In the following, an embodiment of the present invention will be described in this example. The description of the same or equivalent parts as those described in the above embodiment will be given with the same terms and the same reference numerals.
前記実施の形態では、有孔管材の打ち込み終了後に閉塞手段による閉塞を解除したが、これに限定されるものではなく、スパージング井戸のように地盤に向けて空気を圧入するための井戸であれば、不織布のような通気性の布状フィルタ材から構成される閉塞部材が有孔管材の内部に残っていても井戸として使用できるので、閉塞を解除しなくてもよい。 In the above embodiment, the closure by the closing means is released after the perforated tube material is driven. However, the present invention is not limited to this, as long as it is a well for injecting air toward the ground like a sparging well. Even if a blocking member composed of a breathable cloth-like filter material such as a non-woven fabric remains inside the perforated tube material, it can be used as a well, so that it is not necessary to release the blocking.
なお、他の構成及び作用効果については、前記実施の形態と略同様であるので説明を省略する。 Other configurations and functions and effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.
以上、図面を参照して、本発明の実施の形態を実施例で説明してきたが、具体的な構成は、実施例に限らず、本発明の要旨を逸脱しない程度の設計的変更は、本発明に含まれる。 As described above, the embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to the examples, and design changes that do not depart from the gist of the present invention are not limited to the present embodiments. Included in the invention.
例えば、前記実施の形態では、先端有孔鋼管１の一部にのみにスクリーン部１ｂを設けたが、これに限定されるものではなく、スクリーン部１ｂの範囲を広げたり狭めたりすることは任意に設定できる。また、先端有孔鋼管１に接続する継足し鋼管も開口部を設けた有孔管材とすることができる。さらに、有孔管材は、先端に配置される管材でなくてもよい。 For example, in the above-described embodiment, the screen portion 1b is provided only on a part of the tip perforated steel pipe 1. However, the present invention is not limited to this, and it is optional to widen or narrow the range of the screen portion 1b. Can be set. Moreover, the additional steel pipe connected to the front-end | tip porous steel pipe 1 can also be used as the porous pipe material which provided the opening part. Further, the perforated pipe material may not be a pipe material arranged at the tip.
１ 先端有孔鋼管（有孔管材）
１１ スリット（開口部）
２ 金網フィルタ（膜状フィルタ材）
Ｇ 岩盤（地中）
1 Tip perforated steel pipe (perforated pipe material)
11 Slit (opening)
2 Wire mesh filter (membrane filter material)
G bedrock (underground)
Claims (1)
前記有孔管材の内部に土砂の侵入を阻止する布状フィルタ材を詰め込んで前記開口部を閉塞し、
前記開口部を閉塞した状態で前記有孔管材を地中に打ち込むことを特徴とする井戸の構築方法。 A method for constructing a well in which a plurality of openings are formed on the outer periphery and a perforated pipe material in which the inside and outside are communicated is driven into the ground,
Filling the inside of the perforated pipe material with a cloth-like filter material that prevents the intrusion of earth and sand to close the opening,
A well construction method, wherein the perforated tube material is driven into the ground in a state where the opening is closed.
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| CN108222896A (en) * | 2018-01-17 | 2018-06-29 | 中国五冶集团有限公司 | For the halogen mining well structure of the salt pan of drift sand formation containing multilayer geology |
| JP2023500002A (en) * | 2020-12-18 | 2023-01-04 | 福州大学 | Penetrative Mining Apparatus and Mining Method for Offshore Natural Gas Hydrate |
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| JP2003293377A (en) * | 2002-03-29 | 2003-10-15 | Kumagai Gumi Co Ltd | Dewatering method for natural ground and sleeve for dewatering |
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| JPS5088848A (en) * | 1973-12-11 | 1975-07-16 | ||
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| CN108222896A (en) * | 2018-01-17 | 2018-06-29 | 中国五冶集团有限公司 | For the halogen mining well structure of the salt pan of drift sand formation containing multilayer geology |
| JP2023500002A (en) * | 2020-12-18 | 2023-01-04 | 福州大学 | Penetrative Mining Apparatus and Mining Method for Offshore Natural Gas Hydrate |
| JP7349174B2 (en) | 2020-12-18 | 2023-09-22 | 福州大学 | Intrusive mining equipment and mining method for marine natural gas hydrate |
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