JP7305917B2 - Geothermal heat exchange piping installation mechanism to cast-in-place pile reinforcing bar cage, and method for attaching geothermal heat exchange piping - Google Patents

Geothermal heat exchange piping installation mechanism to cast-in-place pile reinforcing bar cage, and method for attaching geothermal heat exchange piping Download PDF

Info

Publication number
JP7305917B2
JP7305917B2 JP2019009210A JP2019009210A JP7305917B2 JP 7305917 B2 JP7305917 B2 JP 7305917B2 JP 2019009210 A JP2019009210 A JP 2019009210A JP 2019009210 A JP2019009210 A JP 2019009210A JP 7305917 B2 JP7305917 B2 JP 7305917B2
Authority
JP
Japan
Prior art keywords
heat exchange
pipe
underground heat
reinforcing bar
bar cage
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.)
Active
Application number
JP2019009210A
Other languages
Japanese (ja)
Other versions
JP2020117925A (en
Inventor
一将 高橋
勝旭 左
啓生 渡邊
慶一 平井
啓祐 鈴木
憲二 今関
貞弘 山嵜
篤 木村
幸治 石黒
雄司 城下
敦史 渡部
啓雄 ▲柳▼田
智宏 干場
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.)
Takenaka Corp
Mitsubishi Materials Techno Corp
Original Assignee
Takenaka Corp
Mitsubishi Materials Techno Corp
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 Takenaka Corp, Mitsubishi Materials Techno Corp filed Critical Takenaka Corp
Priority to JP2019009210A priority Critical patent/JP7305917B2/en
Publication of JP2020117925A publication Critical patent/JP2020117925A/en
Application granted granted Critical
Publication of JP7305917B2 publication Critical patent/JP7305917B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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

Landscapes

  • Piles And Underground Anchors (AREA)
  • Foundations (AREA)

Description

本発明は、場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構、及び地中熱交換用配管の取り付け方法に関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subterranean heat exchange pipe installation mechanism and a method for installing a subterranean heat exchange pipe to a reinforcing bar cage of a cast-in-place pile.

地中熱を利用するために、地中熱交換用配管を場所打ち杭（杭構造体）に設け、地中に埋設された場所打ち杭の地中熱交換用配管に流体を流して流体と地中との間で熱交換を行う方法が種々提案されている（例えば、特許文献１参照）。 In order to utilize the underground heat, a pipe for underground heat exchange is installed in the cast-in-place pile (pile structure), and a fluid flows through the pipe for underground heat exchange of the cast-in-place pile buried underground. Various methods for exchanging heat with the ground have been proposed (see Patent Document 1, for example).

特開２００４－３３２３３０号公報Japanese Patent Application Laid-Open No. 2004-332330

地中熱交換用配管を鉄筋かごに取り付けられた偏心防止用のスペーサーに取り付けると、地中熱交換用配管の取り付け位置が限定されてしまう。また、偏心防止用のスペーサーに取り付ける地中熱交換用配管の数にも制限が出てしまう。 If the underground heat exchange pipe is attached to the eccentricity prevention spacer attached to the reinforcing bar cage, the installation position of the underground heat exchange pipe is limited. In addition, the number of underground heat exchange pipes attached to the spacer for eccentricity prevention is also limited.

ところで、杭長が長い場合、分割した鉄筋かごを接続して場所打ち杭を構築することになる。接続の際に、上下の鉄筋かごの偏心防止用のスペーサーの位置を合わせて接続すれば、地中熱交換用配管を鉄筋かごの軸方向に沿って直線的に配置することはできる。しかしながら、位置あわせのため、クレーンで吊り下げた重量がある鉄筋かごを軸周りに回転させるには時間と労力を必要とする。一般的には経済的、時間的な理由から、偏心防止用のスペーサーの適切な位置合わせを行うような時間を取ることは通常困難である。 By the way, when the pile length is long, cast-in-place piles are constructed by connecting divided reinforcing bar cages. At the time of connection, if the spacers for preventing eccentricity of the upper and lower reinforcing bar cages are aligned and connected, the underground heat exchange pipes can be arranged linearly along the axial direction of the reinforcing bar cages. However, it takes time and effort to rotate a heavy rebar cage suspended by a crane about its axis for alignment. Generally, for economic and time reasons, it is usually difficult to take the time to properly align the anti-eccentric spacers.

上下の鉄筋かごの偏心防止用のスペーサーの位置を正確に合わせないと、スペーサーに取り付けた地中熱交換用配管が捩れながら配置されることとなり、杭の打増し部分に熱交換用配管を施工する必要がある場合、地中熱交換用配管の一部が、場所打ち杭の設計上の外周面よりも内側に入り込み、場所打ち杭のコンクリートの断面欠損となる恐れがある。 If the positions of the spacers for preventing eccentricity of the upper and lower reinforcing bar cages are not precisely aligned, the underground heat exchange pipes attached to the spacers will be arranged twisted, and the heat exchange pipes will be installed in the additional piles. If it is necessary to do so, part of the underground heat exchange pipe may enter the inner side of the designed outer peripheral surface of the cast-in-place pile, resulting in a cross-sectional defect in the concrete of the cast-in-place pile.

一方、特許文献１のように、鉄筋かごの外周に設定される偏心防止用スペーサーより鉄筋かごの外周側に設けた支持材に地中熱交換用配管を取り付ける構造が開示されている。 この構成では、鉄筋かごを杭孔に吊り込んで設置する工程で、地中熱交換用配管が孔壁に接触して損傷することが懸念される。損傷の有無は、鉄筋かごを地上部まで持上げないと確認することは出来ず、確認後に再度建て込みによる損傷の恐れがあるため、確認は困難である。また、地中熱交換用配管に傷が付き、損傷した地中熱交換用配管をコンクリート打設後に補修することも事実上不可能である。 On the other hand, Patent Literature 1 discloses a structure in which underground heat exchange pipes are attached to support members provided on the outer peripheral side of a reinforcing bar cage relative to eccentricity prevention spacers set on the outer periphery of the reinforcing bar cage. In this configuration, there is a concern that the pipe for underground heat exchange may come into contact with the hole wall and be damaged in the process of hanging and installing the reinforcing bar cage in the pile hole. The presence or absence of damage cannot be confirmed without lifting the reinforcing bar cage to the ground, and it is difficult to confirm because there is a risk of damage due to erection again after confirmation. In addition, it is practically impossible to repair the damaged underground heat exchange piping after the concrete is poured because the underground heat exchange piping is damaged.

本発明は上記事実に鑑み、地中熱交換用配管の損傷を抑制可能な地中熱交換用配管設置機構、及び地中熱交換用配管の取り付け方法を提供することが目的である。 In view of the above facts, it is an object of the present invention to provide a subsurface heat exchange pipe installation mechanism capable of suppressing damage to the subsurface heat exchange pipes, and a subsurface heat exchange pipe mounting method.

請求項１に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構は、地中に掘削した掘削孔、または地中に挿入したケーシングに建て込まれる鉄筋かごと、前記鉄筋かごの外周に突出し前記鉄筋かごの周方向に沿って複数設けられ、前記鉄筋かごと前記掘削孔、またはケーシングとの間に隙間を設けるかぶり厚確保用スペーサーと、前記かぶり厚確保用スペーサーとは前記鉄筋かごの軸方向に離間して設けられ、前記かぶり厚確保用スペーサーより突出高さが低い支持部材と、複数の前記かぶり厚確保用スペーサーの外側端部を通る仮想環状ラインよりも内側に配置され、前記支持部材に支持された複数の配管支持用環状フープ筋と、前記鉄筋かごの軸方向に沿って延設され、前記仮想環状ラインよりも内側に配置される複数の前記配管支持用環状フープ筋に係止される地中熱交換用配管と、を有する。 The underground heat exchange piping installation mechanism for a cast-in-place pile reinforcing bar cage according to claim 1 is a reinforcing bar cage built in a drill hole dug in the ground or a casing inserted into the ground, and the reinforcing bar cage A plurality of cover thickness securing spacers protruding from the outer periphery of the reinforcing bar cage and provided along the circumferential direction of the reinforcing bar cage to provide a gap between the reinforcing bar cage and the excavation hole or the casing, and the cover thickness securing spacer A support member spaced apart in the axial direction of the cage and having a projection height lower than that of the spacers for ensuring cover thickness and a virtual annular line passing through the outer ends of the plurality of spacers for ensuring cover thickness. a plurality of pipe-supporting ring-shaped hoop bars supported by the support member; and a underground heat exchange pipe that is locked to the hoop muscle.

請求項１に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構によれば、鉄筋かごの外周から突出したかぶり厚確保用スペーサーが掘削孔の壁面、またはケーシングの壁面に当接して、鉄筋かごと、掘削孔の壁面、またはケーシングの壁面との間に所定の隙間を確保する。なお、鉄筋かごの建て込まれた掘削孔には、後にコンクリートが流し込まれ、コンクリートと鉄筋かごとが一体化して杭となる。 According to the underground heat exchange piping installation mechanism for the cast-in-place pile rebar cage according to claim 1, the cover thickness securing spacer protruding from the outer circumference of the rebar cage hits the wall surface of the excavation hole or the wall surface of the casing. A predetermined gap is secured between the reinforcing bar cage, the wall of the borehole, or the wall of the casing. Concrete is later poured into the excavated hole in which the reinforcing bar cage is built, and the concrete and the reinforcing bar cage are integrated to form a pile.

鉄筋かごの外周には、かぶり厚確保用スペーサーとは鉄筋かごの軸方向に離間した位置にかぶり厚確保用スペーサーより突出高さが低い支持部材が設けられている。また、複数のかぶり厚確保用スペーサーの外側端部を通る仮想環状ラインよりも内側に、支持部材に支持された複数の配管支持用環状フープ筋が配置されており、これらの配管支持用環状フープ筋に、地中熱交換用配管が、鉄筋かごの軸方向に沿って延設されて係止される。 On the outer periphery of the reinforcing bar cage, a supporting member having a lower projecting height than the cover thickness ensuring spacer is provided at a position spaced apart from the cover thickness ensuring spacer in the axial direction of the reinforcing bar cage. In addition, a plurality of pipe-supporting annular hoop bars supported by the supporting member are arranged inside a virtual annular line passing through the outer ends of the plurality of cover thickness securing spacers, and these pipe-supporting annular hoops are arranged. The pipe for underground heat exchange is extended along the axial direction of the reinforcing bar cage and locked to the bar.

また、配管支持用環状フープ筋に係止された地中熱交換用配管は、複数のかぶり厚確保用スペーサーの外側端部を通る仮想環状ラインよりも内側に配置されるので、掘削孔の壁面、またはケーシングの壁面との接触が抑制される。 In addition, since the underground heat exchange pipes anchored to the pipe-supporting annular hoop bars are arranged inside the imaginary annular line passing through the outer ends of the plurality of cover thickness securing spacers, the wall surface of the excavation hole , or contact with the wall surface of the casing is suppressed.

また、地中熱交換用配管は、かぶり厚確保用スペーサーに係止しないので、複数の鉄筋かごを接続する場合、上下の鉄筋かごのかぶり厚確保用スペーサーの位置合わせをする必要がない。地中熱交換用配管は、環状の配管支持用環状フープ筋に係止するので、かぶり厚確保用スペーサーに関係なく、環状の配管支持用環状フープ筋の所望の位置に地中熱交換用配管を係止でき、地中熱交換用配管を軸方向に沿って直線状に配置することができる。 In addition, since the underground heat exchange pipe is not engaged with the cover thickness securing spacer, when connecting a plurality of reinforcing bar cages, it is not necessary to align the cover thickness securing spacers of the upper and lower reinforcing bar cages. Since the underground heat exchange pipe is anchored to the annular pipe supporting annular hoop, regardless of the cover thickness ensuring spacer, the underground heat exchange pipe can be positioned at the desired position of the annular pipe supporting annular hoop. can be locked, and the underground heat exchange piping can be arranged linearly along the axial direction.

これにより、地中熱交換用配管の中間部が、場所打ち杭の設計上の外径（杭径）の内側に入り込んで、断面欠損となることが抑制でき、場所打ち杭の設計上の耐力を確保することができる。 As a result, it is possible to prevent the middle part of the underground heat exchange pipe from entering the inside of the designed outer diameter (pile diameter) of the cast-in-place pile, resulting in a cross-sectional loss, and the designed bearing capacity of the cast-in-place pile. can be ensured.

請求項２に記載の発明は、請求項１に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構において、前記地中熱交換用配管は、前記配管支持用環状フープ筋に沿って移動可能に係止されている。 The invention according to claim 2 is the underground heat exchange pipe installation mechanism for the cast-in-place pile reinforcing bar cage according to claim 1, wherein the underground heat exchange pipe is attached to the pipe supporting annular hoop muscle. movably locked along.

請求項２に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構によれば、地中熱交換用配管は、環状配管支持フープの周方向の任意の位置に係止することができる。したがって、鉄筋かごの軸方向に配置される複数の環状配管支持フープに地中熱交換用配管を係止する際に、地中熱交換用配管を鉄筋かごの軸方向に沿って直線状に配置することができる。 According to the underground heat exchange pipe installation mechanism for the cast-in-place pile reinforcing bar cage according to claim 2, the underground heat exchange pipe can be locked at any position in the circumferential direction of the annular pipe support hoop. can be done. Therefore, when the underground heat exchange pipes are anchored to the plurality of annular pipe support hoops arranged in the axial direction of the reinforcing bar cage, the underground heat exchange pipes are arranged linearly along the axial direction of the reinforcing bar cage. can do.

請求項３に記載の発明は、請求項１または請求項２に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構において、熱交換用流体が供給される往路用の前記地中熱交換用配管の下端と前記熱交換用流体を戻す復路用の前記地中熱交換用配管の下端とを連結する配管継手と、前記鉄筋かご、または前記配管支持用環状フープ筋に取り付けられ、前記掘削孔側から前記配管継手を覆う配管継手保護部材と、を有する。 The invention according to claim 3 is the underground heat exchange pipe installation mechanism to the reinforcing bar cage of the cast-in-place pile according to claim 1 or 2, wherein the outbound route to which the heat exchange fluid is supplied. Attached to a pipe joint that connects the lower end of the medium heat exchange pipe and the lower end of the underground heat exchange pipe for returning the heat exchange fluid, and the reinforcing bar cage or the annular hoop for supporting the pipe and a pipe joint protection member that covers the pipe joint from the excavation hole side.

請求項３に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構によれば、配管継手は、掘削孔の壁面、またはケーシングの壁面に接触しないように配管継手保護部材により保護される。したがって、鉄筋かごを掘削孔に建て込む際、配管継手の損傷が抑制される。 According to the underground heat exchange pipe installation mechanism for the cast-in-place pile reinforcing bar cage according to claim 3, the pipe joint is protected by the pipe joint protection member so as not to contact the wall surface of the excavation hole or the wall surface of the casing. be done. Therefore, damage to the pipe joints is suppressed when the reinforcing bar cage is erected in the excavation hole.

請求項４に記載の発明は、請求項３に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構において、設計上の場所打ち杭の外径の外側に配管継手を位置決めする配管継手位置決め用ふかし部材が設けられている。 The invention according to claim 4 is the underground heat exchange pipe installation mechanism for the cast-in-place pile reinforcing bar cage according to claim 3, wherein the pipe joint is positioned outside the designed outer diameter of the cast-in-place pile. A plumbing joint positioning puff is provided.

請求項４に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構によれば、配管継手位置決め用ふかし部材により、配管継手が設計上の場所打ち杭の外径の外側に位置決めされるので、配管継手が場所打ち杭の外径の内側に入り込んで断面欠損となることが抑制でき、場所打ち杭の設計上の耐力を確保することができる。 According to the underground heat exchange pipe installation mechanism for the cast-in-place pile rebar cage according to claim 4, the pipe joint is positioned outside the designed outer diameter of the cast-in-place pile by the plumbing member for positioning the pipe joint. Therefore, it is possible to suppress the pipe joint from entering the inside of the outer diameter of the cast-in-place pile and causing a cross-sectional loss, and it is possible to ensure the design proof stress of the cast-in-place pile.

請求項５に記載の地中熱交換用配管の取り付け方法は、前記請求項１～請求項４の何れか１項に記載の前記かぶり厚確保用スペーサ、前記配管支持用環状フープ筋、及び前記支持部材を備えた前記鉄筋かごに前記地中熱交換用配管を取り付ける、地中熱交換用配管の取り付け方法であって、ループ状に巻回した前記地中熱交換用配管を支持する配管支持架台を、前記地中熱交換用配管のループの下端が、前記ケーシングの上端より高くなるようにセットし、前記ケーシング内へ向けて前記地中熱交換用配管を巻き出す。 The method for installing the underground heat exchange pipe according to claim 5 includes the spacer for securing cover thickness according to any one of claims 1 to 4, the annular hoop reinforcement for supporting the pipe, and the A method for installing a pipe for underground heat exchange, in which the pipe for underground heat exchange is installed in the reinforcing steel cage provided with a support member, the pipe support for supporting the pipe for underground heat exchange wound in a loop shape. A frame is set so that the lower end of the loop of the underground heat exchange pipe is higher than the upper end of the casing, and the underground heat exchange pipe is unrolled into the casing.

請求項５に記載の地中熱交換用配管の取り付け方法によれば、鉄筋かごに地中熱交換用配管を取り付ける際、ループ状に巻回した地中熱交換用配管を支持する配管支持架台を、地中熱交換用配管のループの下端が、ケーシングの上端より高くなるようにセットし、ケーシング内へ地中熱交換用配管を巻き出す。 According to the installation method of the underground heat exchange pipe according to claim 5, when attaching the underground heat exchange pipe to the reinforcing steel cage, the pipe support frame for supporting the looped underground heat exchange pipe is set so that the lower end of the underground heat exchange pipe loop is higher than the upper end of the casing, and the underground heat exchange pipe is unwound into the casing.

これにより、地中熱交換用配管のループの下端がケーシングの上端より低い場合に比較すると、ケーシングの上端近傍において、配管支持架台から送り出された地中熱交換用配管の角度を、ケーシングの軸方向（鉛直方向）に近づけることができ、地中熱交換用配管とケーシングの上端との擦れを抑制することができる。 As a result, compared to the case where the lower end of the loop of the underground heat exchange pipe is lower than the upper end of the casing, in the vicinity of the upper end of the casing, the angle of the underground heat exchange pipe sent out from the pipe support base is adjusted to the axis of the casing. direction (vertical direction), it is possible to suppress rubbing between the underground heat exchange pipe and the upper end of the casing.

本発明の地中熱交換用配管設置機構、及び地中熱交換用配管の取り付け方法によれば、地中熱交換用配管の損傷を抑制することができる。 According to the underground heat exchange piping installation mechanism and the installation method of the underground heat exchange piping of the present invention, damage to the underground heat exchange piping can be suppressed.

本発明の実施形態に係る地中熱交換用配管設置機構を示す横断面図である。It is a cross-sectional view which shows the piping installation mechanism for underground heat exchange which concerns on embodiment of this invention. 本発明の実施形態に係る地中熱交換用配管設置機構の鉄筋かごを示す側面図である。It is a side view which shows the reinforcement cage|basket of the piping installation mechanism for underground heat exchange which concerns on embodiment of this invention. 鉄筋かごのかぶり厚確保用スペーサー付近を示す斜視図である。Fig. 10 is a perspective view showing the vicinity of a spacer for ensuring cover thickness of the reinforcing-bar cage; 鉄筋かごの地中熱交換用配管の係止部分を示す斜視図である。It is a perspective view which shows the latching|locking part of piping for underground heat exchange of a reinforcing-bar cage|basket. 鉄筋かごのかぶり厚確保用スペーサー付近、及び支持部材付近を拡大して示す側面図である。FIG. 4 is an enlarged side view showing the vicinity of a spacer for securing cover thickness of a reinforcing bar cage and the vicinity of a supporting member; （Ａ）は継手の取り付け部分を示す正面図であり、（Ｂ）は継手の取り付け部分を示す側面図である。(A) is a front view showing the attachment portion of the joint, and (B) is a side view showing the attachment portion of the joint. 配管支持架台の配置を示す平面図である。It is a top view which shows arrangement|positioning of a piping support stand. （Ａ）は配管支持架台を示す側面図であり、（Ｂ）はケーシングの上端付近を示す一部を断面にした側面図である。(A) is a side view showing a pipe support stand, and (B) is a partially cross-sectional side view showing the vicinity of the upper end of a casing.

図１乃至図８にしたがって、本発明の一実施形態に係る地中熱交換用配管設置機構１０について説明する。
図１に示すように、地盤１２には、掘削孔１４が形成されており、掘削孔１４の内部には円筒状のケーシング１６が設置されている。なお、ケーシング１６の一部は、地上に露出している。 A geothermal heat exchange pipe installation mechanism 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8. FIG.
As shown in FIG. 1, an excavated hole 14 is formed in the ground 12, and a cylindrical casing 16 is installed inside the excavated hole 14. As shown in FIG. A part of the casing 16 is exposed on the ground.

図２に示すように、ケーシング１６の内部には、鉄筋かご１８が建て込まれている。鉄筋かご１８は、建物の場所打ち杭（鉄筋かごとコンクリートとが一体化した、いわゆるコンクリート杭）を場所打ちで構築するために用いられるものであり、軸方向に複数連結されている。 As shown in FIG. 2 , a reinforcing bar cage 18 is built into the casing 16 . The reinforcing bar cage 18 is used for constructing cast-in-place piles (so-called concrete piles in which a reinforcing bar cage and concrete are integrated) of a building by casting in place, and a plurality of reinforcing bar cages 18 are connected in the axial direction.

なお、掘削孔１４を形成するための工法としては、アースドリル工法、リバースサーキュレーション工法、オールケーシング工法等の公知の工法を適用することができる。 As a construction method for forming the excavation hole 14, a known construction method such as an earth drilling method, a reverse circulation construction method, or an all casing construction method can be applied.

図１、及び図２に示すように、鉄筋かご１８は、周方向に配列された複数の主筋２０の外周に、鉄筋かご１８の軸方向に沿って環状に形成された複数の杭フープ筋２１が、軸方向に間隔を空けて配筋されている。なお主筋２０と杭フープ筋２１とは溶接等で接合されている。 As shown in FIGS. 1 and 2, the reinforcing bar cage 18 has a plurality of pile hoop bars 21 formed annularly along the axial direction of the reinforcing bar cage 18 on the outer periphery of a plurality of main bars 20 arranged in the circumferential direction. are arranged at intervals in the axial direction. The main reinforcement 20 and pile hoop reinforcement 21 are joined by welding or the like.

図１乃至図３に示すように、杭フープ筋２１の外周には、鋼板等からなるかぶり厚確保用スペーサー２２が溶接等で取り付けられている。かぶり厚確保用スペーサー２２は、台形部分２２Ａと、台形部分２２Ａの端部に一体的に形成される取付部２２Ｂとを備えている。図１に示すように、本実施形態では、４個のかぶり厚確保用スペーサー２２が９０度間隔で配置されているが、かぶり厚確保用スペーサー２２の数は４個に限定されるものではない。なお、かぶり厚確保用スペーサー２２は、一例として、鉄筋かご１８の軸方向に５ｍ間隔で設けることができるが、間隔は５ｍ以外であってもよい。 As shown in FIGS. 1 to 3, a covering thickness ensuring spacer 22 made of a steel plate or the like is attached to the outer periphery of the pile hoop reinforcement 21 by welding or the like. The cover thickness securing spacer 22 includes a trapezoidal portion 22A and a mounting portion 22B integrally formed at the end portion of the trapezoidal portion 22A. As shown in FIG. 1, in this embodiment, four cover thickness ensuring spacers 22 are arranged at intervals of 90 degrees, but the number of cover thickness ensuring spacers 22 is not limited to four. . As an example, the cover thickness securing spacers 22 can be provided at intervals of 5 m in the axial direction of the reinforcing bar cage 18, but the intervals may be other than 5 m.

ここで、複数のかぶり厚確保用スペーサー２２の外周側の端部を通る円形の仮想環状ラインＦＬ１の直径Ｄ１（図１、及び図５参照）は、ケーシング１６の内径よりも若干小さく設定されている。このようにかぶり厚確保用スペーサー２２を設けることで、鉄筋かご１８の中心とケーシング１６の中心とのズレを抑制（偏心抑制）することができ、鉄筋かご１８とケーシング１６の壁面との間に、コンクリートが流し込まれる環状の隙間（かぶり厚）Ｓを設けることができる。 Here, the diameter D1 (see FIGS. 1 and 5) of the circular imaginary annular line FL1 (see FIGS. 1 and 5) passing through the outer peripheral end portions of the plurality of cover thickness ensuring spacers 22 is set slightly smaller than the inner diameter of the casing 16. there is By providing the covering thickness securing spacer 22 in this way, it is possible to suppress the deviation between the center of the reinforcing bar cage 18 and the center of the casing 16 (suppress eccentricity), and the gap between the reinforcing bar cage 18 and the wall surface of the casing 16 can be reduced. , an annular gap (cover thickness) S into which concrete is poured can be provided.

図２乃至図５に示すように、主筋２０の外周には、杭フープ筋２１とは鉄筋かご１８の軸方向の異なる位置に、環状に形成された複数の段取り筋２４が、軸方向に間隔を空けて配筋されている。なお主筋２０と段取り筋２４とは溶接等で接合されている。 As shown in FIGS. 2 to 5 , on the outer periphery of the main reinforcement 20 , a plurality of setup reinforcements 24 are formed in an annular shape at different positions in the axial direction of the reinforcing bar cage 18 from the pile hoop reinforcements 21 , and are spaced apart in the axial direction. The bars are laid out with a space between them. The main reinforcement 20 and the setup reinforcement 24 are joined by welding or the like.

段取り筋２４の外周には、鋼板等からなる支持部材２６が溶接等で取り付けられている。支持部材２６は、台形部分２６Ａと、台形部分２６Ａの端部に一体的に形成される取付部２６Ｂとを備えている。支持部材２６の高さｈ（鉄筋かご１８の径方向に計測）は、かぶり厚確保用スペーサー２２の高さＨよりも低く形成されている。 A support member 26 made of a steel plate or the like is attached to the outer circumference of the setup bar 24 by welding or the like. The support member 26 includes a trapezoidal portion 26A and mounting portions 26B integrally formed at the ends of the trapezoidal portion 26A. The height h of the support member 26 (measured in the radial direction of the reinforcing bar basket 18) is lower than the height H of the cover thickness securing spacer 22. As shown in FIG.

図１、２、４、５に示すように、鉄筋かご１８の径方向外側には、杭フープ筋２１、および段取り筋２４よりも大径とされた環状の配管支持用環状フープ筋２８が配置されている。この配管支持用環状フープ筋２８は、支持部材２６の台形部分２６Ａに溶接等で接合されている。 As shown in FIGS. 1, 2, 4 and 5, the pile hoop reinforcement 21 and the ring-shaped pipe support annular hoop reinforcement 28 having a larger diameter than the setup reinforcement 24 are arranged on the radially outer side of the reinforcing bar cage 18. It is The pipe-supporting annular hoop 28 is joined to the trapezoidal portion 26A of the support member 26 by welding or the like.

図５に示すように、配管支持用環状フープ筋２８の外径Ｄ２は、かぶり厚確保用スペーサー２２の外周側の端部を通る円形の仮想環状ラインＦＬ１の直径Ｄ１よりも小さく設定されている。
また、仮想環状ラインＦＬ１の直径をＤ１、配管支持用環状フープ筋２８の外径をＤ２、後述する地中熱交換用配管３０の直径をｄとしたときに、Ｄ１＞Ｄ２＋２ｄを満足するように設定されている。 As shown in FIG. 5, the outer diameter D2 of the pipe-supporting annular hoop bar 28 is set to be smaller than the diameter D1 of the circular imaginary annular line FL1 passing through the outer peripheral edge of the cover thickness securing spacer 22. .
Further, when the diameter of the virtual annular line FL1 is D1, the outer diameter of the annular hoop bar 28 for pipe support is D2, and the diameter of the underground heat exchange pipe 30 described later is d, D1>D2+2d is satisfied. is set.

図１、２、４、５に示すように、鉄筋かご１８の径方向外側に設けられた複数の配管支持用環状フープ筋２８には、その外周側に、軸方向に沿って延びる複数本（偶数本）の地中熱交換用配管３０が配置されている。地中熱交換用配管３０には、冷房、暖房等に用いられる熱媒体が流される。地中熱交換用配管３０は、各配管支持用環状フープ筋２８に結束バンド３２等、を用いて係止されている。結束バンド３２としては、一例として、インシュロック（登録商標）、タイラップ（登録商標）等を用いることができる。 As shown in FIGS. 1, 2, 4, and 5, a plurality of pipe-supporting annular hoop bars 28 provided radially outside the reinforcing bar cage 18 have a plurality of ( An even number) of underground heat exchange pipes 30 are arranged. A heat medium used for cooling, heating, or the like flows through the underground heat exchange pipe 30 . The underground heat exchange pipes 30 are locked to the pipe supporting annular hoop bars 28 using binding bands 32 or the like. As the binding band 32, for example, Insulok (registered trademark), tie wrap (registered trademark), or the like can be used.

図５に示すように、配管支持用環状フープ筋２８に係止された地中熱交換用配管３０は、かぶり厚確保用スペーサー２２の外周側の端部を通る円形の仮想環状ラインＦＬ１の径方向内側に配置されており、地中熱交換用配管３０は、該仮想環状ラインＦＬ１よりも径方向外側へ突出することなく、また、杭フープ筋２１、及び段取り筋２４の外径Ｄ３よりも径方向内側へ突出しないように、配管支持用環状フープ筋２８に支持されている。 As shown in FIG. 5, the underground heat exchange pipe 30 anchored to the pipe-supporting annular hoop bar 28 extends along the diameter of a circular imaginary annular line FL1 passing through the outer peripheral end of the cover thickness securing spacer 22. The underground heat exchange pipe 30 is arranged inward in the direction, and does not protrude radially outward from the virtual annular line FL1, and is wider than the outer diameter D3 of the pile hoop reinforcement 21 and the setup reinforcement 24. It is supported by a pipe-supporting annular hoop 28 so as not to protrude radially inward.

本実施形態において、場所打ち杭の設計上の外径は、配管支持用環状フープ筋２８の外径Ｄ４と一致している。ケーシング１６には、地中熱交換用配管３０の取り付けられた鉄筋かご１８が建て込まれた後、コンクリートが流し込まれて、コンクリートが固化して鉄筋かご１８と一体化して場所打ち杭（図示せず）となる。 In this embodiment, the designed outer diameter of the cast-in-place pile matches the outer diameter D4 of the pipe-supporting annular hoop reinforcement 28 . After the reinforced cage 18 to which the underground heat exchange pipe 30 is attached is erected in the casing 16, concrete is poured, and the concrete is solidified and integrated with the reinforced cage 18 to form a cast-in-place pile (not shown). without).

なお、ケーシング１６にコンクリートが流し込まれると、配管支持用環状フープ筋２８とケーシング１６の壁面との間の隙間にもコンクリートが充填されるので、実際の場所打ち杭の外径は、設計上の外径よりも大きくなる。 When concrete is poured into the casing 16, the gap between the pipe-supporting annular hoop 28 and the wall surface of the casing 16 is also filled with concrete. larger than the outer diameter.

場所打ち杭の設計上の外径よりも外側に地中熱交換用配管３０が配置されて、場所打ち杭の設計上の外径よりも外側のコンクリートが地中熱交換用配管３０によって断面欠損しても、場所打ち杭の設計上の耐力は確保されるので問題ない。しかし、仮に、地中熱交換用配管３０が、場所打ち杭の設計上の外径よりも内側に入り込むことがあると、設計上の外径の内側のコンクリートに断面欠損が生じ、場所打ち杭の設計上の耐力が落ちることがある。このため、地中熱交換用配管３０が、場所打ち杭の設計上の外径よりも内側に入り込むことは避けなければならない。 The underground heat exchange pipe 30 is arranged outside the designed outer diameter of the cast-in-place pile, and the concrete outside the designed outer diameter of the cast-in-place pile is damaged by the underground heat exchange pipe 30. However, there is no problem because the design strength of the cast-in-place pile is ensured. However, if the underground heat exchange pipe 30 enters inside the designed outer diameter of the cast-in-place pile, a cross-sectional defect occurs in the concrete inside the designed outer diameter, and the cast-in-place pile design strength may be reduced. Therefore, it is necessary to avoid the underground heat exchange pipe 30 from entering inside the designed outer diameter of the cast-in-place pile.

本実施形態では、地中熱交換用配管３０が、場所打ち杭の設計上の外径（配管支持用環状フープ筋２８の外径Ｄ２と同じ）よりも外側に配置されるので、設計上の外径よりも内側のコンクリートに断面欠損が生じることを抑制でき、場所打ち杭の設計上の耐力を確保することができる。 In this embodiment, the underground heat exchange pipe 30 is arranged outside the designed outer diameter of the cast-in-place pile (same as the outer diameter D2 of the pipe-supporting annular hoop bar 28). It is possible to suppress the occurrence of cross-sectional loss in the concrete inside the outer diameter, and it is possible to ensure the design proof stress of the cast-in-place pile.

図２、及び図６（Ａ）に示すように、互いに隣り合う一方の地中熱交換用配管３０の下端と、他方の地中熱交換用配管３０の下端とは、配管継手３４で接続されている。配管継手３４で接続された一方の地中熱交換用配管３０は、熱媒体が供給される往路用の配管であり、他方の地中熱交換用配管３０は、熱媒体が戻される復路用の配管として機能する。 As shown in FIGS. 2 and 6A, the lower end of one of the adjacent underground heat exchange pipes 30 and the lower end of the other adjacent underground heat exchange pipe 30 are connected by a pipe joint 34. ing. One of the underground heat exchange pipes 30 connected by a pipe joint 34 is an outbound pipe to which the heat medium is supplied, and the other underground heat exchange pipe 30 is a return route to which the heat medium is returned. Acts as plumbing.

地中熱交換用配管３０は、全体的に鉄筋かご１８の軸方向に沿って直線状とされているが、下端付近においては緩やかに曲げられて、下端同士を接近させている。なお、配管継手３４は、内部に略Ｕ字状の流路を有している。 The underground heat exchange pipe 30 is generally linear along the axial direction of the reinforcing bar cage 18, but is gently bent in the vicinity of the lower end to bring the lower ends closer to each other. The pipe joint 34 has a substantially U-shaped channel inside.

図６（Ｂ）に示すように、配管継手３４は地中熱交換用配管３０よりも厚みがあるので、配管継手３４は、地中熱交換用配管３０よりもケーシング１６の壁面に接近している。このため、配管継手３４がケーシング１６の壁面に接触して損傷しないように、配管継手３４が配管継手保護部材３６で覆われている。なお、図２において、配管継手保護部材３６の図示は省略されている。 As shown in FIG. 6B, since the pipe joint 34 is thicker than the underground heat exchange pipe 30, the pipe joint 34 is closer to the wall surface of the casing 16 than the underground heat exchange pipe 30. there is Therefore, the pipe joint 34 is covered with a pipe joint protection member 36 so that the pipe joint 34 is not damaged by coming into contact with the wall surface of the casing 16 . 2, illustration of the pipe joint protection member 36 is omitted.

配管継手保護部材３６は、矩形の鋼板等を折り曲げて形成されており、配管継手３４の下端部分が、厚手の鋼板等からなるフカシ金属板３８を介して配管支持用環状フープ筋２８の外周部分に図示しないボルト等で取り付けられている。なお、フカシ金属板３８は、溶接等で配管支持用環状フープ筋２８の外周に接合されている。 The pipe joint protection member 36 is formed by bending a rectangular steel plate or the like. are attached with bolts or the like (not shown). In addition, the anchor metal plate 38 is joined to the outer periphery of the pipe-supporting annular hoop bar 28 by welding or the like.

また、フカシ金属板３８は、配管継手３４が場所打ち杭の設計上の外径Ｄ２よりも内側に入り込んで、該設計上の外径の内側のコンクリートが断面欠損しないように、その厚みが設定されている。 In addition, the thickness of the anchor metal plate 38 is set so that the pipe joint 34 enters inside the designed outer diameter D2 of the cast-in-place pile and the concrete inside the designed outer diameter does not lose its cross section. It is

（地中熱交換用配管の鉄筋かごへの取り付け）
先ず、地中熱交換用配管３０を鉄筋かご１８へ取り付ける前に、図７、及び図８に示すように、ロール状に巻回した長尺の地中熱交換用配管３０を配管支持架台４０に支持させる。
配管支持架台４０は、鉄パイプ等で櫓状に組み立てられており、巻回した地中熱交換用配管３０を引掛ける一対の支持棒４０Ａが左右の水平方向に突出している。したがって、１台の配管支持架台４０に対して、２つのロール状に巻回した地中熱交換用配管３０を支持することができる。
なお、配管支持架台４０には、ロール状に巻回した地中熱交換用配管３０が、上方へ膨らみ過ぎないように、横方向に延びるストッパー棒４２が支持棒４０Ａの上方に設けられている。 (Attachment of pipes for underground heat exchange to a reinforced cage)
First, before attaching the underground heat exchange pipe 30 to the reinforcing bar cage 18, as shown in FIGS. be supported by
The pipe support frame 40 is assembled with iron pipes or the like in a tower shape, and a pair of support rods 40A for hooking the wound underground heat exchange pipes 30 protrude in the left and right horizontal directions. Therefore, two roll-shaped underground heat exchange pipes 30 can be supported on one pipe support frame 40 .
In addition, the pipe support frame 40 is provided with a laterally extending stopper rod 42 above the support rod 40A so that the underground heat exchange pipe 30 wound in a roll shape does not swell excessively upward. .

図８に示すように、配管支持架台４０の高さは、支持棒４０Ａに支持した地中熱交換用配管３０の下端３０Ａが、ケーシング１６の上端１６Ａよりも上側に位置するように、その高さが決められている。
図７に示すように、本実施形態では、３台の配管支持架台４０が、ケーシング１６の近傍に、ケーシング１６を取り囲むようにケーシング１６周方向に等間隔で配置されている。なお、一例として、地中熱交換用配管３０を配管支持架台４０から送り出す作業員４４を、１台の配管支持架台４０に対して１名配置することができる。 As shown in FIG. 8, the height of the pipe support frame 40 is such that the lower end 30A of the underground heat exchange pipe 30 supported by the support rods 40A is located above the upper end 16A of the casing 16. is determined.
As shown in FIG. 7 , in the present embodiment, three pipe support frames 40 are arranged in the vicinity of the casing 16 at equal intervals in the circumferential direction of the casing 16 so as to surround the casing 16 . In addition, as an example, one worker 44 for sending out the underground heat exchange pipe 30 from the pipe support frame 40 can be arranged for one pipe support frame 40 .

次に、地中熱交換用配管３０を鉄筋かご１８へ取り付ける手順を説明する。
（１） 配管継手３４に２本の地中熱交換用配管３０の先端を取り付け、その配管継手３４、及び配管継手保護部材３６を、クレーン（図示せず）で吊り下げた鉄筋かご１８のフカシ金属板３８にボルト等を用いて取り付ける。 Next, a procedure for attaching the underground heat exchange pipe 30 to the reinforcing bar cage 18 will be described.
(1) The ends of two underground heat exchange pipes 30 are attached to the pipe joints 34, and the pipe joints 34 and the pipe joint protection member 36 are suspended from the reinforcing bar cage 18 by a crane (not shown). It is attached to the metal plate 38 using bolts or the like.

（２） クレーンで吊り下げた鉄筋かご１８をケーシング１６の中に徐々に下降させると共に、配管支持架台４０の近傍に配置した作業員４４（図７参照）が、鉄筋かご１８の軸方向に沿って地中熱交換用配管３０が沿うように配管支持架台４０から地中熱交換用配管３０を鉄筋かご１８に向けて順次巻き出し、ケーシング１６の近傍に配置した作業員４６（図７参照）が地中熱交換用配管３０の中間部を結束バンド３２で配管支持用環状フープ筋２８に係止する（図４参照）。 (2) While gradually lowering the reinforcing bar cage 18 suspended by a crane into the casing 16, a worker 44 (see FIG. 7) placed near the pipe support frame 40 moves the reinforcing bar cage 18 along the axial direction. The underground heat exchange pipe 30 is unwound sequentially from the pipe support frame 40 toward the reinforcing bar cage 18 so that the underground heat exchange pipe 30 is along the worker 46 (see FIG. 7) placed near the casing 16. locks the intermediate portion of the underground heat exchange pipe 30 to the pipe-supporting annular hoop bar 28 with a binding band 32 (see FIG. 4).

以後、鉄筋かご１８を下降させ、地中熱交換用配管３０の中間部を結束バンド３２を用いて配管支持用環状フープ筋２８に順次係止してゆく。なお、地中熱交換用配管３０の係止は、地中熱交換用配管３０を配管支持用環状フープ筋２８に係止作業がし易い位置にて、鉄筋かご１８の下降を停止して、ケーシング１６の近傍に配置した作業員４６が行う。
鉄筋かご１８の下降が停止した状態では、作業員４４も、鉄筋かご１８の前に出てきて作業員４６と同様に係止作業を行う。 Thereafter, the reinforcing bar cage 18 is lowered, and the intermediate portions of the underground heat exchange pipes 30 are successively locked to the pipe supporting annular hoop bars 28 using the binding bands 32 . In order to lock the underground heat exchange pipe 30, the lowering of the reinforcing bar cage 18 is stopped at a position where it is easy to lock the underground heat exchange pipe 30 to the pipe supporting annular hoop bar 28. A worker 46 placed in the vicinity of the casing 16 performs this.
In the state where the descent of the reinforcing bar cage 18 is stopped, the worker 44 also comes out in front of the reinforcing bar cage 18 and performs the locking work in the same manner as the worker 46 .

なお、杭長が長い場合には、複数の鉄筋かご１８を上下方向に順次連結しながら、下降させる。鉄筋かご１８の下降が停止した状態では、作業員４４も、鉄筋かご１８の前に出てきて作業員４６と同様に係止作業を行う。 In addition, when the pile length is long, the plurality of reinforcing bar cages 18 are lowered while being sequentially connected in the vertical direction. In the state where the descent of the reinforcing bar cage 18 is stopped, the worker 44 also comes out in front of the reinforcing bar cage 18 and performs the locking work in the same manner as the worker 46 .

地中熱交換用配管３０は、可撓性を有しているため、途中で曲がったり蛇行することがないように、作業員４６は、地中熱交換用配管３０が直線状に支持される様に、各配管支持用環状フープ筋２８に地中熱交換用配管３０を係止する。 Since the underground heat exchange pipe 30 is flexible, the operator 46 must ensure that the underground heat exchange pipe 30 is linearly supported so that it does not bend or meander in the middle. Similarly, the pipes 30 for underground heat exchange are locked to the annular hoop bars 28 for supporting pipes.

図８（Ａ）に示すように、ケーシング１６の右側に示す高さの低い配管支持架台４８では、支持されたロール状に巻回された地中熱交換用配管３０の下端３０Ａが、ケーシング１６の上端１６Ａよりも低く、巻き出された地中熱交換用配管３０は、ケーシング１６の上端１６Ａ付近において、鉛直方向に対して大きな角度を有するようになるため（本実施形態の左側の配管支持架台４０対比で）、地中熱交換用配管３０がケーシング１６の上端１６Ａの内側角部で擦れ易く、地中熱交換用配管３０が損傷する恐れがある。 As shown in FIG. 8(A), in the low pipe support frame 48 shown on the right side of the casing 16, the lower end 30A of the supported underground heat exchange pipe 30 wound in a roll shape is attached to the casing 16. As shown in FIG. Lower than the upper end 16A, the unrolled underground heat exchange pipe 30 has a large angle with respect to the vertical direction near the upper end 16A of the casing 16 (the left side of the pipe support in this embodiment). ), the underground heat exchange piping 30 tends to rub against the inner corners of the upper end 16A of the casing 16, and the underground heat exchange piping 30 may be damaged.

一方、ケーシング１６の左側に示す本実施形態の配管支持架台４０は高さが高く、支持されたロール状に巻回された地中熱交換用配管３０は、その下端３０Ａがケーシング１６の上端１６Ａよりも上方に位置するので、ケーシング１６の上端１６Ａ付近では、地中熱交換用配管３０の角度が鉛直に近づき、地中熱交換用配管３０がケーシング１６の上端１６Ａで擦れ難くなる。 On the other hand, the pipe support frame 40 of the present embodiment shown on the left side of the casing 16 is tall, and the supported underground heat exchange pipe 30 wound in a roll shape has a lower end 30A that extends from an upper end 16A of the casing 16 . Since it is located above, near the upper end 16A of the casing 16, the angle of the underground heat exchange pipe 30 approaches vertical, and the underground heat exchange pipe 30 is less likely to rub against the upper end 16A of the casing 16.

なお、図８（Ｂ）に示すように、地中熱交換用配管３０がケーシング１６の上端１６Ａの内側角部に接触しないように、ケーシング１６の上端１６Ａに、接触防止用の保護マット５０等を被せて地中熱交換用配管３０を保護することが望ましい。 In addition, as shown in FIG. 8B, a protective mat 50 or the like for preventing contact is attached to the upper end 16A of the casing 16 so that the underground heat exchange pipe 30 does not contact the inner corner of the upper end 16A of the casing 16. It is desirable to protect the underground heat exchange piping 30 by covering it.

本実施形態の地中熱交換用配管設置機構１０では、地中熱交換用配管３０とケーシング１６との間にコンクリートが充填されるが、地中熱交換用配管３０はケーシング１６に近接して配置されているため、地盤１２との間で効率的に熱交換を行うことができる。 In the underground heat exchange pipe installation mechanism 10 of the present embodiment, concrete is filled between the underground heat exchange pipe 30 and the casing 16, but the underground heat exchange pipe 30 is close to the casing 16. Since it is arranged, heat can be efficiently exchanged with the ground 12 .

地中熱交換用配管３０は、かぶり厚確保用スペーサー２２の先端よりも内側に配置されるので、地中熱交換用配管３０がケーシング１６の壁面に接触して損傷することが抑制される。 Since the underground heat exchange pipe 30 is arranged inside the tip of the covering thickness ensuring spacer 22, the underground heat exchange pipe 30 is prevented from coming into contact with the wall surface of the casing 16 and being damaged.

地中熱交換用配管３０は、場所打ち杭の設計上の外径（配管支持用環状フープ筋２８の外径Ｄ２）よりも外側に配置されるので、設計上の外径よりも内側のコンクリートに断面欠損が生じることを抑制でき、場所打ち杭の設計上の耐力を確保することができる。 Since the underground heat exchange pipe 30 is arranged outside the designed outer diameter of the cast-in-place pile (the outer diameter D2 of the pipe-supporting annular hoop reinforcement 28), the concrete inside the designed outer diameter It is possible to suppress the occurrence of cross-sectional loss in the pile, and to ensure the design proof stress of the cast-in-place pile.

配管継手３４は、ケーシング１６側が配管継手保護部材３６で覆われているので、配管継手３４がケーシング１６の壁面に接触して損傷することが抑制される。また、配管継手３４は、配管継手３４が場所打ち杭の設計上の外径Ｄ２よりも内側に入り込まないようにフカシ金属板３８を介して配管支持用環状フープ筋２８に取り付けられているので、設計上の外径よりも内側のコンクリートに断面欠損が生じることを抑制でき、場所打ち杭の設計上の耐力を確保することができる。 Since the pipe joint 34 is covered with the pipe joint protection member 36 on the casing 16 side, the pipe joint 34 is prevented from coming into contact with the wall surface of the casing 16 and being damaged. In addition, the pipe joint 34 is attached to the pipe-supporting annular hoop bar 28 via the metal plate 38 so that the pipe joint 34 does not enter the designed outer diameter D2 of the cast-in-place pile. It is possible to suppress the occurrence of cross-sectional loss in the concrete inside the design outer diameter, and it is possible to ensure the design proof strength of the cast-in-place pile.

なお、鉄筋かご１８の軸方向における配管支持用環状フープ筋２８の数を、鉄筋かご１８の軸方向におけるかぶり厚確保用スペーサー２２の数よりも多く設置することで、軸方向に配置される配管支持用環状フープ筋２８と配管支持用環状フープ筋２８との間隔を狭くして単位長さ当たりの地中熱交換用配管３０の係止箇所を増やすことができ、地中熱交換用配管３０の曲がりや蛇行をより抑制することができる。 By setting the number of annular hoop bars 28 for pipe support in the axial direction of the reinforcing bar cage 18 to be greater than the number of cover thickness securing spacers 22 in the axial direction of the reinforcing bar cage 18, the pipes arranged in the axial direction By narrowing the distance between the supporting annular hoop muscle 28 and the pipe supporting annular hoop muscle 28, it is possible to increase the number of fixing points of the underground heat exchange pipe 30 per unit length. bending and meandering can be further suppressed.

本実施形態では、地中熱交換用配管３０を環状の配管支持用環状フープ筋２８に係止するので、数多くの地中熱交換用配管３０を配管支持用環状フープ筋２８の周方向の所望の位置に容易に係止することができる。したがって、地中熱交換用配管３０の係止位置の自由度が高い。 In this embodiment, since the underground heat exchange pipes 30 are anchored to the annular pipe-supporting annular hoop bars 28, a large number of the underground heat exchange pipes 30 are arranged in the desired circumferential direction of the pipe-supporting annular hoop bars 28. position can be easily locked. Therefore, the degree of freedom of the locking position of the underground heat exchange pipe 30 is high.

［その他の実施形態］
以上、本発明の実施形態について説明したが、本発明はこうした実施形態に何等限定されるものでなく、本発明の要旨を逸脱しない範囲において、種々なる態様で実施し得ることは勿論である。 [Other embodiments]
Although the embodiments of the present invention have been described above, the present invention is by no means limited to such embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

上記実施形態では、掘削孔１４に円筒状のケーシング１６が設置されていたが、ケーシング１６は必要に応じて設置すればよく、本発明においてケーシング１６の設置は必須ではない。
上記実施形態では、ケーシング１６は掘削孔１４の底まで設ける形態を図示したが、これに限るものではなく、例えば、ケーシング１６は掘削孔１４の表層側のみ（地表から掘削孔１４の途中まで）に設けるようにしてもよい。 In the above-described embodiment, the cylindrical casing 16 is installed in the borehole 14, but the casing 16 may be installed as required, and installation of the casing 16 is not essential in the present invention.
In the above-described embodiment, the casing 16 is provided up to the bottom of the drilled hole 14, but the present invention is not limited to this. may be set to

１０…地中熱交換用配管設置機構（場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構）
１４…掘削孔
１６…ケーシング
１８…鉄筋かご
２２…かぶり厚確保用スペーサー
２６…支持部材
ＦＬ１…仮想環状ライン
２８…配管支持用環状フープ筋
３０…地中熱交換用配管
３２…結束バンド
３４…配管継手
３６…配管継手保護部材
３８…フカシ金属板（配管継手位置決め用ふかし部材）
４０…配管支持架台 10 ... underground heat exchange pipe installation mechanism (pipe installation mechanism for underground heat exchange to the reinforcing bar cage of the cast-in-place pile)
Reference Signs List 14 Drilling hole 16 Casing 18 Reinforcing bar cage 22 Spacer for securing covering thickness 26 Supporting member FL1 Virtual annular line 28 Pipe supporting annular hoop bar 30 Geothermal heat exchange pipe 32 Tie band 34 Piping Joint 36... Pipe joint protection member 38... Fukashi metal plate (puff member for positioning the pipe joint)
40 Piping support frame

Claims (5)

地中に掘削した掘削孔、または地中に挿入されたケーシングに建て込まれる鉄筋かごと、
前記鉄筋かごの外周に突出し前記鉄筋かごの周方向に沿って複数設けられ、前記鉄筋かごと前記掘削孔、またはケーシングとの間に隙間を設けるかぶり厚確保用スペーサーと、
前記かぶり厚確保用スペーサーとは前記鉄筋かごの軸方向に離間して設けられ、前記かぶり厚確保用スペーサーより突出高さが低い支持部材と、
複数の前記かぶり厚確保用スペーサーの外側端部を通る仮想環状ラインよりも内側に配置され、前記支持部材に支持された複数の配管支持用環状フープ筋と、
前記鉄筋かごの軸方向に沿って延設され、前記仮想環状ラインよりも内側に配置される複数の前記配管支持用環状フープ筋に係止される地中熱交換用配管と、
を有する、場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構。 A rebar cage erected in a borehole drilled into the ground or a casing inserted into the ground,
Cover thickness securing spacers protruding from the outer periphery of the reinforcing bar cage and provided in plurality along the circumferential direction of the reinforcing bar cage to provide a gap between the reinforcing bar cage and the drill hole or casing;
The cover thickness ensuring spacer is a support member provided apart in the axial direction of the reinforcing bar cage and having a lower projecting height than the cover thickness ensuring spacer;
a plurality of pipe-supporting annular hoop bars arranged inside a virtual annular line passing through the outer ends of the plurality of cover thickness securing spacers and supported by the supporting member;
A subterranean heat exchange pipe that extends along the axial direction of the reinforcing bar cage and is anchored to the plurality of pipe-supporting annular hoop bars arranged inside the virtual annular line;
A pipe installation mechanism for underground heat exchange to a cast-in-place pile rebar cage. 前記地中熱交換用配管は、前記配管支持用環状フープ筋に沿って移動可能に係止されている、請求項１に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構。 The underground heat exchange pipe installation mechanism for a cast-in-place pile reinforcing bar cage according to claim 1, wherein the underground heat exchange pipe is movably locked along the pipe-supporting annular hoop reinforcement. . 熱交換用流体が供給される往路用の前記地中熱交換用配管の下端と前記熱交換用流体を戻す復路用の前記地中熱交換用配管の下端とを連結する配管継手と、
前記鉄筋かご、または前記配管支持用環状フープ筋に取り付けられ、前記掘削孔側から前記配管継手を覆う配管継手保護部材と、
を有する、請求項１または請求項２に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構。 a pipe joint that connects the lower end of the underground heat exchange pipe for the forward route to which the heat exchange fluid is supplied and the lower end of the underground heat exchange pipe for the return route to which the heat exchange fluid is returned;
a pipe joint protection member attached to the reinforcing bar cage or the pipe supporting annular hoop and covering the pipe joint from the drill hole side;
The pipe installation mechanism for underground heat exchange to the reinforcing bar cage of the cast-in-place pile according to claim 1 or claim 2, having. 設計上の場所打ち杭の外径の外側に配管継手を位置決めする配管継手位置決め用ふかし部材が設けられている、請求項３に記載の場所打ち杭の鉄筋かごへの地中熱交換用配管設置機構。 Installation of pipe for underground heat exchange in a reinforcing bar cage of a cast-in-place pile according to claim 3, wherein a plumbing member for positioning the pipe joint is provided outside the designed outer diameter of the cast-in-place pile. mechanism. 前記請求項１～請求項４の何れか１項に記載の前記かぶり厚確保用スペーサ、前記配管支持用環状フープ筋、及び前記支持部材を備えた前記鉄筋かごに前記地中熱交換用配管を取り付ける、地中熱交換用配管の取り付け方法であって、
ループ状に巻回した前記地中熱交換用配管を支持する配管支持架台を、前記地中熱交換用配管のループの下端が、前記ケーシングの上端より高くなるようにセットし、前記ケーシング内へ向けて前記地中熱交換用配管を巻き出す、地中熱交換用配管の取り付け方法。 The underground heat exchange pipe is installed in the reinforcing steel cage provided with the covering thickness securing spacer, the pipe supporting annular hoop bar, and the supporting member according to any one of claims 1 to 4. A method for installing a pipe for underground heat exchange,
A pipe support frame for supporting the pipe for underground heat exchange wound in a loop is set so that the lower end of the loop of the pipe for underground heat exchange is higher than the upper end of the casing, and is inserted into the casing. A method for attaching a pipe for underground heat exchange, wherein the pipe for underground heat exchange is unrolled toward the ground.
JP2019009210A 2019-01-23 2019-01-23 Geothermal heat exchange piping installation mechanism to cast-in-place pile reinforcing bar cage, and method for attaching geothermal heat exchange piping Active JP7305917B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019009210A JP7305917B2 (en) 2019-01-23 2019-01-23 Geothermal heat exchange piping installation mechanism to cast-in-place pile reinforcing bar cage, and method for attaching geothermal heat exchange piping

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019009210A JP7305917B2 (en) 2019-01-23 2019-01-23 Geothermal heat exchange piping installation mechanism to cast-in-place pile reinforcing bar cage, and method for attaching geothermal heat exchange piping

Publications (2)

Publication Number Publication Date
JP2020117925A JP2020117925A (en) 2020-08-06
JP7305917B2 true JP7305917B2 (en) 2023-07-11

Family

ID=71891888

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2019009210A Active JP7305917B2 (en) 2019-01-23 2019-01-23 Geothermal heat exchange piping installation mechanism to cast-in-place pile reinforcing bar cage, and method for attaching geothermal heat exchange piping

Country Status (1)

Country Link
JP (1) JP7305917B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115094875B (en) * 2022-07-05 2023-08-04 郑州大学 High-heat-conductivity water-permeable energy pile and manufacturing method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004332330A (en) 2003-05-06 2004-11-25 Taisei Corp Installation mechanism of heat exchange pipe in heat exchange system using foundation pile of building
JP2012077579A (en) 2010-10-06 2012-04-19 Toda Constr Co Ltd Installation method of underground heat exchange tube, and reinforcement cage for the same
JP2015017445A (en) 2013-07-11 2015-01-29 大成建設株式会社 Pile structure
JP2018178667A (en) 2017-04-21 2018-11-15 株式会社大林組 Reinforced cage for pile, pile and construction method of piping for underground heat exchange

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004332330A (en) 2003-05-06 2004-11-25 Taisei Corp Installation mechanism of heat exchange pipe in heat exchange system using foundation pile of building
JP2012077579A (en) 2010-10-06 2012-04-19 Toda Constr Co Ltd Installation method of underground heat exchange tube, and reinforcement cage for the same
JP2015017445A (en) 2013-07-11 2015-01-29 大成建設株式会社 Pile structure
JP2018178667A (en) 2017-04-21 2018-11-15 株式会社大林組 Reinforced cage for pile, pile and construction method of piping for underground heat exchange

Also Published As

Publication number Publication date
JP2020117925A (en) 2020-08-06

Similar Documents

Publication Publication Date Title
KR100838736B1 (en) Connection and junction apparatus of steel pipe for strut
KR20060092552A (en) The non-strut down framework construction method of having used cast in place concrete pile
JP7305917B2 (en) Geothermal heat exchange piping installation mechanism to cast-in-place pile reinforcing bar cage, and method for attaching geothermal heat exchange piping
JP5351382B2 (en) Method for assembling shaft scaffolding and method for removing shaft scaffolding
JP5089320B2 (en) Tube insertion spacer
JP7039856B2 (en) Construction method of reinforcing bar cage for piles, piles and geothermal heat exchange piping
JP5480094B2 (en) Installation method of underground heat exchange tube and its reinforcing rod
JP2007162266A (en) Two-step earth retaining wall and its construction method
JP4890217B2 (en) Construction method of underground structure and underground structure
KR101007006B1 (en) Structure for Reinforcing Head of Steel Tube Pile
JP6669573B2 (en) How to install reinforced cage
JP6541255B2 (en) Pile design method and structure support structure
JP6428014B2 (en) Construction method of back strut
KR101538074B1 (en) Pivot Joint Type Aseismatic Device and Method using thereof
US7021868B1 (en) Lightweight shoring system for accommodating crossing utilities
KR101187174B1 (en) Pre-founded Column System having Bearing-Shear Band and Beam-Column Connection System using Grouted Jacket having Bearing-Shear Band for Top-Down or Common Construction
KR102151167B1 (en) Geotechnical formwork fixing device for construction of cast-in-place piles and construction method
JP3899307B2 (en) Cast-in-place concrete filled steel pipe pile and method for constructing cast-in-place concrete filled steel pipe pile
KR101886273B1 (en) Method and apparatus for forming basic support for fence installed in wall
WO2015102032A1 (en) Support post structure for safety fence
JP6630616B2 (en) Pile formation method, pile
KR101803767B1 (en) Assembly for reinforcing head part of steel tube pile and steel tubepile assembly including the same
JP2021143576A (en) Concrete member and segment
KR102311110B1 (en) Structure of the Vertical Sphere for the Cross Sectional Variation and its Construction Method
JP6632237B2 (en) Heat exchange device using ready made pile and ready made pile with heat exchange pipe

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20211125

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20220812

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20220816

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20230110

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20230530

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20230608

R150 Certificate of patent or registration of utility model

Ref document number: 7305917

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150