JP4619105B2 - Construction method of geothermal facilities - Google Patents

Construction method of geothermal facilities Download PDF

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JP4619105B2
JP4619105B2 JP2004363454A JP2004363454A JP4619105B2 JP 4619105 B2 JP4619105 B2 JP 4619105B2 JP 2004363454 A JP2004363454 A JP 2004363454A JP 2004363454 A JP2004363454 A JP 2004363454A JP 4619105 B2 JP4619105 B2 JP 4619105B2
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embedding
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vertical hole
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JP2006170072A (en
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美喜男 梅岡
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T2010/50—Component parts, details or accessories
    • F24T2010/53—Methods for installation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Foundations (AREA)
  • Piles And Underground Anchors (AREA)

Description

本発明は、地熱を利用して建物の冷暖房を行うための地熱発電設備を効率的に施工するための方法に関するものである。   The present invention relates to a method for efficiently constructing a geothermal power generation facility for cooling and heating a building using geothermal heat.

地下１０ｍ以深の部分は、一年を通じて１０〜２０℃程度の温度を保っている。それゆえ、近年では、特許文献１の如く、そのような地下の熱（いわゆる地熱）を利用して建物の冷暖房を低コストで行う地熱発電について検討されている。   The part deeper than 10m underground maintains a temperature of about 10-20 ° C throughout the year. Therefore, in recent years, as disclosed in Patent Document 1, geothermal power generation that uses such underground heat (so-called geothermal) to cool and heat a building at low cost has been studied.

特開２００３−１２０５１３号公報JP 2003-120513 A

ところが、地熱発電を行うためには、地下１０ｍ以深の部分にまで至る配管を何本も地中に埋設しなければならないため、かかる配管の埋設工事に多大な手間とコストとを要してしまう。それゆえ、従来の地熱発電設備の施工方法では、低コストで建物の冷暖房を行うという地熱発電のメリットを十分に発現させることができなかった。   However, in order to perform geothermal power generation, it is necessary to embed a number of pipes extending to a depth of 10 m or deeper in the ground, so that a great amount of labor and cost are required for such pipe burying work. . Therefore, the conventional construction method of geothermal power generation facilities cannot sufficiently exhibit the merit of geothermal power generation that cools and heats buildings at low cost.

本発明の目的は、上記従来の地熱発電設備の施工方法が有する問題点を解消し、非常に容易にかつ安価に地熱発電設備を施工することが可能な施工方法を提供することにある。   An object of the present invention is to provide a construction method capable of solving the problems of the conventional geothermal power generation facility construction method and constructing the geothermal power generation facility very easily and inexpensively.

本発明の内、請求項１に記載された発明の構成は、重機を用いて地盤改良工事を施した後に建物を建設する際に並行して行う地熱利用設備の施工方法であって、前記地盤改良工事に使用した重機を再度利用して縦孔を掘削する掘削工程と、前記縦孔内にＵ字状で複数のパイプを埋設する埋設工程と、前記複数のパイプ同士、および、パイプとヒートポンプとを接続する接続工程とを含んでおり、前記地盤改良工事が、重機を用いて地盤に縦孔を掘削してその縦孔内に鋼管杭を埋設し、その鋼管杭の基端の上に建物の基礎を作るものであり、前記埋設工程が、Ｕ字状で複数のパイプとしてフレキシブルステンレスパイプを用いるものであり、前記接続工程が、縦孔内に埋設されたパイプ同士を地中（地表部付近）にて接続するものであるとともに、前記埋設工程において埋設されるＵ字状のパイプの下端を、前記地盤改良工事において埋設される鋼管杭の下端よりも上方に位置させることを特徴とするものである。 Of the present invention, the configuration of the invention described in claim 1 is a construction method of a geothermal utilization facility that is performed in parallel with construction of a building after performing ground improvement work using heavy machinery, Excavation process of excavating a vertical hole by reusing heavy equipment used for improvement work, an embedding process of embedding a plurality of pipes in a U-shape in the vertical hole, the plurality of pipes, and a pipe and a heat pump includes a connection step of connecting the door, the ground improvement work is a steel pipe pile is embedded in the vertical hole drilling vertical holes in the ground with heavy equipment, onto the proximal end of the steel pipe pile The building process is a foundation, the embedding process is U-shaped and a flexible stainless steel pipe is used as a plurality of pipes, and the connection process is performed by connecting pipes embedded in vertical holes into the ground (ground surface). In the vicinity of the part) The lower end of the U-shaped pipe that is embedded in the embedding step, is characterized in that is positioned above the lower end of the steel pipe piles are embedded in the ground improvement work.

請求項２に記載された発明の構成は、請求項１に記載された発明において、地盤改良工事が、重機により掘削した縦孔に杭を埋設させることにより地盤を強化するものであることにある。なお、縦孔に埋設させる杭としては、いわゆる鋼管杭やコンクリート杭等を用いることができる。   The structure of the invention described in claim 2 is that, in the invention described in claim 1, the ground improvement work is to strengthen the ground by burying a pile in a vertical hole excavated by a heavy machine. . In addition, as a pile embed | buried in a vertical hole, what is called a steel pipe pile, a concrete pile, etc. can be used.

請求項３に記載された発明の構成は、請求項１、または請求項２に記載された発明において、Ｕ字状のパイプを埋設させるための縦孔を掘削する際に、重機のオーガーを所定方向に回転させて所定の深さまで掘り下げた後に、オーガーを前記所定方向と反対方向に回転させながら掘り下げた位置から所定の高さだけ上方まで引き抜いた後に、オーガーの回転を停止させた状態で、オーガーを引き抜くことにある。   According to a third aspect of the present invention, in the invention according to the first or second aspect, when the vertical hole for embedding the U-shaped pipe is excavated, the auger of the heavy machine is predetermined. In a state where the rotation of the auger is stopped after the auger is pulled up to a predetermined height from the position dug down while rotating in the direction opposite to the predetermined direction after being rotated in the direction and digging to a predetermined depth, To pull out the auger.

請求項１に記載された発明によれば、Ｕ字状のパイプを埋設するための縦孔が、地盤改良工事に利用する重機を用いて掘削されるため、重機を何度も搬送する手間が掛からないので、非常に容易にかつ安価に地熱利用設備を施工することが可能となる。また、請求項１に記載された発明によれば、Ｕ字状のパイプがフレキシブルなものとなるので、地震等があった場合でも、埋設されたＵ字状のパイプに亀裂が入ったりする心配がない。 According to the invention described in claim 1, since the vertical hole for embedding the U-shaped pipe is excavated using the heavy machinery used for the ground improvement work, the labor of transporting the heavy machinery many times is reduced. Since it is not hung, it is possible to construct the geothermal facility very easily and inexpensively. Further, according to the invention described in claim 1, since the U-shaped pipe becomes flexible, there is a concern that the embedded U-shaped pipe may crack even in the event of an earthquake or the like. There is no.

請求項２に記載された発明によれば、建物が建設される地盤が強固なものとなるので、地震等があった場合でも、施工された地熱発電設備が損傷する心配がない。   According to the second aspect of the present invention, since the ground on which the building is constructed is strong, there is no concern that the constructed geothermal power generation facility will be damaged even in the event of an earthquake or the like.

請求項３に記載された発明によれば、Ｕ字状のパイプを埋設させるための縦孔の周囲が強固に固められるため、Ｕ字状のパイプを埋設させる際に、縦孔が埋まって再度掘削しなければならなくなる、という事態が生じたりしない。   According to the invention described in claim 3, since the periphery of the vertical hole for embedding the U-shaped pipe is firmly solidified, when embedding the U-shaped pipe, the vertical hole is buried again. There will be no situation of having to dig.

以下、本発明に係る地熱発電設備の施工方法の一実施形態について、図面に基づいて詳細に説明する。   Hereinafter, an embodiment of a construction method for a geothermal power generation facility according to the present invention will be described in detail based on the drawings.

地熱発電設備を施工する際には、まず、地盤の改良（軟弱地盤の強化）の目的で、地盤中に所定の間隔で複数本の鋼管杭が埋設される。図１は、地盤に鋼管杭を埋設する様子を示したものであり、鋼管杭１の埋設は、重機２によって鋼管杭１を回転させながら地盤Ｇの中に貫入させることによって行われる（図１（ａ）参照）。なお、埋設される鋼管杭１は、中空状になっており、先端際に、略一周に亘って螺旋翼３が設けられている。また、各鋼管杭１，１・・は、先端が硬い地盤Ｈまで食い込み、基端が地表よりも３０ｃｍ程度下方に位置するように埋設される（図１（ｂ）参照）。なお、そのような埋設状態にするために、別の鋼管杭１，１・・を継ぎ足すことも可能である。図２は、鋼管杭１，１・・が埋設された地盤Ｇを上から見た図であり、区画された地盤Ｇには、所定の間隔の格子状に鋼管杭１，１・・が埋設されている。   When constructing a geothermal power generation facility, a plurality of steel pipe piles are first buried in the ground at predetermined intervals for the purpose of improving the ground (strengthening the soft ground). FIG. 1 shows a state in which a steel pipe pile 1 is buried in the ground, and the steel pipe pile 1 is buried by being penetrated into the ground G while rotating the steel pipe pile 1 by a heavy machine 2 (FIG. 1). (See (a)). In addition, the steel pipe pile 1 embed | buried is hollow shape, and the spiral wing | blade 3 is provided over substantially one round at the front-end | tip. Further, each steel pipe pile 1, 1,... Is embedded so that the distal end bites into the ground H having a hard tip, and the proximal end is positioned about 30 cm below the ground surface (see FIG. 1B). In addition, in order to set it as such an embedding state, it is also possible to add another steel pipe pile 1,1, .... FIG. 2 is a top view of the ground G in which the steel pipe piles 1, 1... Are embedded, and the steel pipe piles 1, 1,. Has been.

次に、上述の如く、鋼管杭１，１・・が埋設された地盤Ｇに、地熱発電用のＵ字状パイプを埋設させるための複数の縦孔が掘削される。図３は、かかる縦孔を掘削する様子を示したものであり、縦孔の掘削においては、まず、上記の如く鋼管杭１，１・・を貫入させた重機２のアダプターがオーガー４に交換される。そして、そのオーガー４を正回転（たとえば、時計回りの回転）させながら、図３（ａ）の如く、所定の長さＬ１まで貫入させる（すなわち、掘り下げる）。しかる後、貫入させたオーガー４を逆回転（たとえば、反時計回りの回転）させながら引き上げ（図３（ｂ）の状態）、図３（ｃ）の如く、所定の長さＬ２（５０ｃｍ〜１ｍ程度）だけ引き上げられた後には、オーガー４の回転を停止させた状態で、オーガー４を地盤Ｇの中から引き上げることによって、縦孔５を形成する（図３（Ｄ）の状態）。このような工程でＵ字状パイプ埋設用の縦孔５を掘削することによって、縦孔５の周囲の土壌が固められ、地盤Ｇ上の衝撃によって縦孔５が埋まってしまう、という事態が発生しないようになる。なお、縦孔５の深さは、４〜１０ｍの範囲内で、必要に応じて適宜調整される。図４は、縦孔５，５・・が掘削された地盤Ｇを上から見た図であり、地盤Ｇには、所定の間隔の格子状に縦孔５，５・・が掘削されており、埋設された鋼管杭１，１・・と千鳥格子を形成した状態になっている。   Next, as described above, a plurality of vertical holes for burying U-shaped pipes for geothermal power generation are excavated in the ground G in which the steel pipe piles 1, 1,. FIG. 3 shows a state in which such a vertical hole is excavated. In the excavation of the vertical hole, first, the adapter of the heavy machine 2 through which the steel pipe piles 1, 1,. Is done. Then, while the auger 4 is rotated forward (for example, clockwise), as shown in FIG. 3A, the auger 4 is penetrated to a predetermined length L1 (that is, dug down). Thereafter, the inserted auger 4 is pulled up while rotating in reverse (for example, counterclockwise) (in the state shown in FIG. 3B). As shown in FIG. 3C, a predetermined length L2 (50 cm to 1 m) is obtained. After that, the vertical hole 5 is formed by lifting the auger 4 from the ground G in a state where the rotation of the auger 4 is stopped (the state shown in FIG. 3D). By excavating the vertical hole 5 for embedding the U-shaped pipe in such a process, the soil around the vertical hole 5 is solidified, and the vertical hole 5 is buried by the impact on the ground G. Will not do. In addition, the depth of the vertical hole 5 is suitably adjusted as needed within the range of 4-10 m. FIG. 4 is a view of the ground G from which the vertical holes 5, 5... Have been excavated from above, and the vertical holes 5, 5. The buried steel pipe piles 1, 1,... And the houndstooth are formed.

しかる後、掘削された各縦孔５，５・・に、図５の如く、Ｕ字状パイプ１０，１０・・を埋設する。図６は、埋設するＵ字状パイプの断面の様子を示したものであり、Ｕ字状パイプ１０は、所定の厚み（たとえば、２〜５ｍｍ）のフレキシブルステンレスパイプ６の外周を、所定の厚み（たとえば、０．３〜２ｍｍ）を有する耐食性の高い塩化ビニル７で覆ったものである。各縦孔５，５・・にＵ字状パイプ１０，１０・・を埋設した後には、各Ｕ字状パイプ１０，１０・・の両端を、それぞれ、隣り合うＵ字状パイプ１０の端縁と接続することによって、各縦孔５，５・・に埋設されたＵ字状パイプを一連のパイプとする。なお、各縦孔５，５・・に埋設されたＵ字状パイプ１０，１０・・同士の接続は、Ｕ字状パイプ１０，１０・・と同一の塩化ビニル７で被覆されたフレキシブルステンレスパイプ６を用いて行われる。図６（ａ）は、各Ｕ字状パイプ１０，１０・・が接続された状態の地盤Ｇを上から見た図であり、Ｕ字状パイプ１０，１０・・は、一つの角の部分（斜線を付した円形Ｂの部分）を除いて一連に繋がった状態になっている（以下、一連のパイプＰという）。また、Ｕ字状パイプ１０，１０・・同士は、地盤Ｇに埋設した鋼管杭１，１・・の上に建物の基礎を施工する際に邪魔になったり、美観が損なわれたりしないように、図６（ｂ）の如く、地中にて接続されている。   After that, as shown in FIG. 5, U-shaped pipes 10, 10,... Are embedded in the excavated vertical holes 5, 5,. FIG. 6 shows a state of a cross section of the U-shaped pipe to be embedded. The U-shaped pipe 10 has a predetermined thickness around the outer periphery of the flexible stainless steel pipe 6 having a predetermined thickness (for example, 2 to 5 mm). It is covered with vinyl chloride 7 having high corrosion resistance (for example, 0.3 to 2 mm). After embedding the U-shaped pipes 10, 10... In the vertical holes 5, 5..., Both ends of the U-shaped pipes 10, 10. To form a series of pipes. The U-shaped pipes embedded in the vertical holes 5, 5,. The U-shaped pipes 10, 10,... Embedded in the vertical holes 5, 5,... Are connected to each other by flexible stainless steel pipes coated with the same vinyl chloride 7 as the U-shaped pipes 10, 10,. 6 is used. FIG. 6A is a view of the ground G in a state where the U-shaped pipes 10, 10,... Are connected from above, and the U-shaped pipes 10, 10,. It is in a state of being connected in series except for (the portion of circle B with diagonal lines) (hereinafter referred to as a series of pipes P). Also, the U-shaped pipes 10, 10,... Should not interfere with the construction of the foundation of the building on the steel pipe piles 1, 1,. As shown in FIG. 6B, they are connected in the ground.

そして、上記の如く、Ｕ字状パイプ１０，１０・・が埋設されて接続された後には、埋設された各鋼管１，１・・の上に、建物の基礎が作られる。図７（ａ）は、基礎工事を完了した地盤Ｇを上から見た図であり、図７（ｂ）は、図７（ａ）におけるＡ−Ａ線断面を示したものである。建物の基礎８は、埋設された鋼管杭１，１・・を繋ぐように掛け渡された状態になっている。   As described above, after the U-shaped pipes 10, 10,... Are buried and connected, the foundation of the building is formed on each of the buried steel pipes 1, 1,. Fig.7 (a) is the figure which looked at the ground G which completed the foundation construction from the top, FIG.7 (b) shows the AA line cross section in Fig.7 (a). The foundation 8 of the building is in a state of being stretched so as to connect the buried steel pipe piles 1, 1.

建物の基礎８が作られた後には、その基礎８の上に、建物９が建設される。一方、建物９の内部には、地中熱を利用して建物の内部の温度コントロールをするためのヒートポンプ１１が設置され、そのヒートポンプ１１と一連のパイプＰとが、地盤Ｇの角の開放部分において接続される。なお、ヒートポンプ１１としては、コンプレッサと熱交換機とを備えた公知の地熱発電用のものを好適に使用することができる。このように施工されたヒートポンプ１１および一連のパイプＰからなる地熱発電設備によれば、一年を通じて１０〜２０℃程度の温度を保つ地下の熱（いわゆる地熱）を、水等の媒体を介して利用することにより、安価かつ効率的に建物９の冷暖房をすることが可能となる。   After the building foundation 8 is made, the building 9 is constructed on the foundation 8. On the other hand, a heat pump 11 is installed inside the building 9 to control the temperature inside the building using geothermal heat. The heat pump 11 and the series of pipes P are open portions at the corners of the ground G. Connected at In addition, as the heat pump 11, the well-known thing for geothermal power generation provided with the compressor and the heat exchanger can be used conveniently. According to the geothermal power generation facility composed of the heat pump 11 and the series of pipes P thus constructed, underground heat (so-called geothermal heat) that maintains a temperature of about 10 to 20 ° C. throughout the year is transmitted through a medium such as water. By using it, it becomes possible to cool and cool the building 9 inexpensively and efficiently.

上記実施形態の如き施工方法によれば、Ｕ字状パイプ１０，１０・・を埋設するための縦孔５，５・・が、地盤改良工事に利用された重機２を用いて掘削されるため、重機２を何度も搬送する手間が掛からないので、非常に容易にかつ安価に地熱発電設備を施工することが可能となる。   According to the construction method as in the above embodiment, the vertical holes 5, 5... For embedding the U-shaped pipes 10, 10... Are excavated using the heavy machinery 2 used for the ground improvement work. Since there is no need to carry the heavy machine 2 many times, it is possible to construct the geothermal power generation facility very easily and inexpensively.

また、上記実施形態の如き施工方法によれば、建物９が建設される地盤Ｇが強固なものとなるので、地震等があった場合でも、施工された地熱発電設備が損傷する心配がない。   Further, according to the construction method as in the above embodiment, since the ground G on which the building 9 is constructed becomes strong, there is no fear that the constructed geothermal power generation facility will be damaged even in the event of an earthquake or the like.

さらに、上記実施形態の如き施工方法によれば、Ｕ字状パイプ１０，１０・・を埋設させるための縦孔５，５・・の周囲が強固に固められるため、Ｕ字状パイプ１０，１０・・を埋設させる際に、縦孔５，５・・が埋まって再度掘削しなければならなくなる、という事態が生じたりしない。   Furthermore, according to the construction method as in the above embodiment, the periphery of the vertical holes 5, 5,... For embedding the U-shaped pipes 10, 10,.・ When embedding, it does not happen that the vertical holes 5, 5,.

また、上記実施形態の如き施工方法によれば、Ｕ字状パイプ１０，１０・・の強度が非常に高いものとなるので、地震等があった場合でも、埋設されたＵ字状パイプ１０，１０・・に亀裂が入ったりする心配がない。   Further, according to the construction method as in the above embodiment, the strength of the U-shaped pipes 10, 10... Is very high, so that even if there is an earthquake or the like, the embedded U-shaped pipes 10, 10. There is no need to worry about cracks in 10.

加えて、上記実施形態の如き施工方法によれば、施工後長期間経過した後でも、土壌に含まれる各種の物質によってＵ字状パイプ１０，１０・・が浸食される、という事態が生じない。   In addition, according to the construction method as in the above embodiment, even when a long time has elapsed after construction, there is no situation in which the U-shaped pipes 10, 10,... Are eroded by various substances contained in the soil. .

なお、本発明に係る地熱発電設備の施工方法は、上記実施形態の態様に何ら限定されるものではなく、本発明の趣旨を逸脱しない範囲内で適宜変更することが可能である。たとえば、地盤中に埋設する鋼管杭の個数や配置、Ｕ字状パイプ同士の接続のレイアウト等は、改良する地盤の形状等に応じて適宜変更することができる。   In addition, the construction method of the geothermal power generation equipment which concerns on this invention is not limited to the aspect of the said embodiment at all, It is possible to change suitably in the range which does not deviate from the meaning of this invention. For example, the number and arrangement of steel pipe piles to be embedded in the ground, the layout of connection between U-shaped pipes, and the like can be changed as appropriate according to the shape of the ground to be improved.

たとえば、地熱発電設備のＵ字状パイプを埋設するための縦孔の掘削は、上記実施形態の如く、地盤改良工事の後に行う必要はなく、地盤改良工事と同時に進行させることも可能であるし、場合によっては、地盤改良工事に先立って行うことも可能である。   For example, the excavation of the vertical hole for embedding the U-shaped pipe of the geothermal power generation facility does not need to be performed after the ground improvement work as in the above embodiment, and can be performed simultaneously with the ground improvement work. In some cases, it may be performed prior to ground improvement work.

加えて、地盤改良工事は、上記実施形態の如く、縦孔に鋼管杭を埋設することのみによって地盤を強化する工事に限定されず、埋設した鋼管杭の内部に地盤を固化させるためのセメントミルクを流し込む工事等に変更することも可能である。また、地盤の表層（深さ約３０ｃｍ〜１ｍ程度の部分）を掘削し、その掘削部分を、掘削された土（いわゆる現状土）とセメント系固化材との混合撹拌物によって埋め戻して重機で転圧する工事（いわゆる表層地盤改良工事）等に変更することも可能である。そのような構成を採用した場合でも、地盤改良工事に利用する重機を用いてＵ字状パイプを埋設するための縦孔が掘削されるため、重機を何度も搬送する手間が掛からないので、非常に容易にかつ安価に地熱発電設備を施工することが可能となる。   In addition, the ground improvement work is not limited to the work of strengthening the ground only by embedding the steel pipe pile in the vertical hole as in the above embodiment, but cement milk for solidifying the ground inside the buried steel pipe pile. It is also possible to change to construction that pours in. Also, excavate the surface layer of the ground (about 30 cm to 1 m in depth) and refill the excavated part with a mixed agitation of the excavated soil (so-called current soil) and cement-based solidified material. It is also possible to change to rolling work (so-called surface ground improvement work). Even when such a configuration is adopted, since the vertical hole for embedding the U-shaped pipe is excavated using a heavy machine used for ground improvement work, it does not take time to transport the heavy machine many times. It becomes possible to construct a geothermal power generation facility very easily and inexpensively.

本発明に係る地熱発電設備の施工方法は、上記の如く優れた効果を奏するものであるので、種々のタイプの地熱発電設備の施工に、好適に用いることができる。   Since the construction method of the geothermal power generation facility according to the present invention has excellent effects as described above, it can be suitably used for construction of various types of geothermal power generation facilities.

地盤に鋼管杭を埋設する様子を示す説明図である。It is explanatory drawing which shows a mode that a steel pipe pile is embed | buried in the ground. 鋼管杭が埋設された地盤を上から見た様子を示す説明図である。It is explanatory drawing which shows a mode that the ground with which the steel pipe pile was embed | buried was seen from the top. Ｕ字状パイプ埋設用の縦孔を掘削する様子を示す説明図である。It is explanatory drawing which shows a mode that the vertical hole for U-shaped pipe embedding is excavated. Ｕ字状パイプ埋設用の縦孔が掘削された地盤を上から見た様子を示す説明図である。It is explanatory drawing which shows a mode that the ground where the vertical hole for U-shaped pipe embedding was excavated was seen from the top. 掘削された縦孔にＵ字状パイプを埋設する様子を示す説明図である。It is explanatory drawing which shows a mode that a U-shaped pipe is embed | buried in the excavated vertical hole. （ａ）はＵ字状パイプが接続された状態の地盤を上から見た様子を示す説明図であり、（ｂ）はＵ字状パイプの一部を地中で接続した状態を示す説明図である。(A) is explanatory drawing which shows a mode that the ground in the state where the U-shaped pipe was connected was seen from the top, (b) is explanatory drawing which shows the state which connected a part of U-shaped pipe in the ground It is. （ａ）は基礎工事を完了した地盤を上から見た様子を示す説明図であり、（ｂ）は（ａ）におけるＡ−Ａ線断面である。(A) is explanatory drawing which shows a mode that the ground which completed the foundation construction was seen from the top, (b) is the AA sectional view in (a). 地熱発電設備が施工された状態を示す説明図である。It is explanatory drawing which shows the state by which the geothermal power generation equipment was constructed.

符号の説明Explanation of symbols

１・・鋼管杭、２・・重機、４・・オーガー、５・・縦孔、６・・フレキシブルステンレスパイプ、７・・塩化ビニル、９・・建物、１０・・Ｕ字状パイプ、Ｇ・・地盤。   1. Steel pipe piles, 2. Heavy machinery, 4. Augers, 5. Vertical holes, 6. Flexible stainless steel pipes, 7. Vinyl chloride, 9. Buildings, 10. U-shaped pipes, G. ·ground.

Claims (3)

重機を用いて地盤改良工事を施した後に建物を建設する際に並行して行う地熱利用設備の施工方法であって、
前記地盤改良工事に使用した重機を再度利用して縦孔を掘削する掘削工程と、前記縦孔内にＵ字状で複数のパイプを埋設する埋設工程と、前記複数のパイプ同士、および、パイプとヒートポンプとを接続する接続工程とを含んでおり、
前記地盤改良工事が、重機を用いて地盤に縦孔を掘削してその縦孔内に鋼管杭を埋設し、その鋼管杭の基端の上に建物の基礎を作るものであり、
前記埋設工程が、Ｕ字状で複数のパイプとしてフレキシブルステンレスパイプを用いるものであり、
前記接続工程が、縦孔内に埋設されたパイプ同士を地中にて接続するものであるとともに、
前記埋設工程において埋設されるＵ字状のパイプの下端を、前記地盤改良工事において埋設される鋼管杭の下端よりも上方に位置させることを特徴とする地熱利用設備の施工方法。 It is a construction method of geothermal utilization equipment that is performed in parallel when building a building after performing ground improvement work using heavy machinery ,
A drilling step of drilling a longitudinal hole by using heavy equipment used in the soil improvement works again, the embedding step of embedding a plurality of pipes in U-shape in the longitudinal hole, the plurality of pipes to each other, and the pipe And a connection process for connecting the heat pump,
The ground improvement work is to dig a vertical hole in the ground using a heavy machine, embed a steel pipe pile in the vertical hole, and make the foundation of the building on the base end of the steel pipe pile,
The embedding process uses a flexible stainless steel pipe as a plurality of pipes in a U shape,
While the connecting step is to connect the pipes embedded in the vertical hole in the ground,
A construction method of a geothermal utilization facility , wherein a lower end of a U-shaped pipe buried in the embedding step is positioned above a lower end of a steel pipe pile buried in the ground improvement work . 地盤改良工事が、重機により掘削した縦孔に杭を埋設させることにより地盤を強化するものであることを特徴とする請求項１に記載の地熱利用設備の施工方法。 The construction method for geothermal utilization equipment according to claim 1, wherein the ground improvement work is to reinforce the ground by burying a pile in a vertical hole excavated by a heavy machine. Ｕ字状のパイプを埋設させるための縦孔を掘削する際に、重機のオーガーを所定方向に回転させて所定の深さまで掘り下げた後に、オーガーを前記所定方向と反対方向に回転させながら掘り下げた位置から所定の高さだけ上方まで引き抜いた後に、オーガーの回転を停止させた状態で、オーガーを引き抜くことを特徴とする請求項１、または２に記載の地熱利用設備の施工方法。 When excavating a vertical hole for embedding a U-shaped pipe, the auger of a heavy machine was rotated in a predetermined direction and dug down to a predetermined depth, and then the auger was dug down while rotating in a direction opposite to the predetermined direction. The construction method of the geothermal utilization facility according to claim 1 or 2, wherein the auger is pulled out after the auger is stopped from rotating after being pulled upward by a predetermined height from the position.
JP2004363454A 2004-12-15 2004-12-15 Construction method of geothermal facilities Expired - Fee Related JP4619105B2 (en)

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JP2002054850A (en) * 2000-08-08 2002-02-20 Nippon Steel Corp Underground heat exchange system
JP2003221883A (en) * 2002-01-30 2003-08-08 Sekisui House Ltd Structure for heating and cooling building by using geothermy

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002054850A (en) * 2000-08-08 2002-02-20 Nippon Steel Corp Underground heat exchange system
JP2003221883A (en) * 2002-01-30 2003-08-08 Sekisui House Ltd Structure for heating and cooling building by using geothermy

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