JP2020117925A - Installation mechanism and attaching method of underground heat exchange piping to reinforced cage of cast-in-place pile - Google Patents
Installation mechanism and attaching method of underground heat exchange piping to reinforced cage of cast-in-place pile Download PDFInfo
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- 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
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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 ground heat exchange pipe installation mechanism and a method for attaching underground 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 use the underground heat, a pipe for underground heat exchange is installed on the cast-in-place pile (pile structure), and the fluid is made to flow by flowing the fluid through the pipe for underground heat exchange of the cast-in-place pile buried in the ground. Various methods for exchanging heat with the ground have been proposed (for example, see Patent Document 1).
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 pipe for underground heat exchange is attached to the spacer for preventing eccentricity attached to the rebar cage, the mounting position of the pipe for underground heat exchange will be limited. In addition, the number of underground heat exchange pipes attached to the spacer for preventing eccentricity 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, the cast-in-place pile is constructed by connecting the divided reinforcing steel cages. At the time of connection, if the spacers for preventing eccentricity of the upper and lower rebar cages are aligned and connected, the underground heat exchange pipe can be linearly arranged along the axial direction of the rebar cage. However, it takes time and labor to rotate a heavy reinforcing bar cage around a shaft, which is suspended by a crane, for alignment. Generally, for economical and time reasons, it is usually difficult to take time to properly align the spacer for preventing eccentricity.
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 spacers for preventing eccentricity of the upper and lower rebar cages are not aligned correctly, the underground heat exchange pipes attached to the spacers will be twisted and arranged, and the heat exchange pipes will be installed in the additional portion of the pile. If it is necessary to do so, a part of the underground heat exchange pipe may enter inside the designed outer peripheral surface of the cast-in-place pile, resulting in a loss of the concrete section 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, as in Patent Document 1, there is disclosed a structure in which an underground heat exchange pipe is attached to a support member provided on the outer peripheral side of the reinforcing bar car with respect to an eccentricity prevention spacer set on the outer periphery of the reinforcing bar car. With this configuration, there is a concern that the underground heat exchange pipe may be damaged by contact with the hole wall in the process of suspending and installing the reinforcing steel cage in the pile hole. The presence or absence of damage cannot be confirmed without lifting the rebar cage to the ground, and there is a risk of damage due to re-installation after confirmation, so it is difficult to confirm. Further, it is practically impossible to repair the damaged underground heat exchange pipe after the concrete is placed because the underground heat exchange pipe 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, an object of the present invention is to provide an underground heat exchange pipe installation mechanism and an underground heat exchange pipe installation method capable of suppressing damage to the underground heat exchange pipe.
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 pipe installation mechanism for underground heat exchange in the reinforcing bar car of the cast-in-place pile according to claim 1 is a reinforcing bar cage built in a drilled hole in the ground or a casing inserted in the ground, and the reinforcing bar car. A plurality of spacers for projecting to the outer periphery of the reinforcing bar cage provided along the circumferential direction of the reinforcing bar cage, for providing a clearance between the rebar cage and the excavation hole, or the casing, and the cover thickness ensuring spacer are A support member that is spaced apart in the axial direction of the rebar cage and has a lower projecting height than the cover thickness securing spacers, and is arranged inside a virtual annular line that passes through the outer ends of the plurality of cover thickness securing spacers. And a plurality of pipe supporting annular hoops supported by the supporting member, and a plurality of the pipe supporting annulars extending along the axial direction of the rebar cage and arranged inside the virtual annular line. And a pipe for underground heat exchange 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 pipe installation mechanism for the reinforcing bar cage of the cast-in-place pile according to claim 1, the cover thickness securing spacer projecting from the outer periphery of the reinforcing bar cage contacts the wall surface of the drill hole or the wall surface of the casing. In contact with each other, a predetermined gap is secured between the cage and the wall surface of the excavation hole or the wall surface of the casing. Note that concrete is later poured into the excavation hole in which the reinforcing cage is built, and the concrete and cage are integrated into 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 support member having a lower protruding height than the covering thickness securing spacer is provided at a position separated from the covering thickness securing spacer in the axial direction of the reinforcing bar cage. Further, a plurality of pipe supporting annular hoops supported by the supporting member are arranged inside the 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 underground heat exchange pipe is extended and locked to the reinforcement along the axial direction of the reinforcement cage.
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。 Further, since the underground heat exchange pipe locked to the pipe supporting annular hoop muscle is arranged inside the virtual 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。 Further, since the underground heat exchange pipe is not locked to the cover thickness securing spacer, when connecting a plurality of reinforcing bar cars, it is not necessary to align the upper and lower reinforcing bar cage spacers for ensuring the cover thickness. Since the underground heat exchange pipe is locked to the annular hoop reinforcement for supporting the annular pipe, the underground heat exchange pipe is located at the desired position on the annular hoop reinforcement for supporting the annular pipe regardless of the cover thickness securing spacer. Can be locked, and the underground heat exchange pipe can be linearly arranged 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 intermediate portion of the underground heat exchange pipe from entering the inside of the designed outside diameter (pile diameter) of the cast-in-place pile, resulting in a cross-section loss, and to design the cast-in-place pile's yield strength. Can be secured.
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。 According to a second aspect of the present invention, in the underground heat exchange pipe installation mechanism for the reinforcing bar cage of the cast-in-place pile according to the first aspect, the underground heat exchange pipe is the annular hoop reinforcement for pipe support. It is locked so that it can move 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 of the cast-in-place pile on the rebar cage of claim 2, the underground heat exchange pipe is locked at an arbitrary position in the circumferential direction of the annular pipe support hoop. You can Therefore, when locking the underground heat exchange pipes to the multiple annular pipe support hoops that are arranged in the axial direction of the reinforcement car, arrange the underground heat exchange pipes linearly along the axial direction of the reinforcement car. 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。 According to a third aspect of the present invention, in the underground heat exchange pipe installation mechanism for the reinforcing bar cage of the cast-in-place pile according to the first aspect or the second aspect, the forward path for supplying the heat exchange fluid is used. A pipe joint connecting the lower end of the pipe for medium heat exchange and the lower end of the pipe for underground heat exchange for returning the fluid for heat exchange, and the rebar cage, or attached to the annular hoop reinforcement for pipe support And a pipe joint protection member that covers the pipe joint from the side of the excavation hole.
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 of the cast-in-place pile of the cast-in-place pile according to claim 3, the pipe joint is protected by the pipe joint protection member so as not to come into contact with the wall surface of the excavation hole or the wall surface of the casing. To be done. Therefore, the damage of the pipe joint is suppressed when the rebar cage is built 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。 According to a fourth aspect of the present invention, in the pipe installation mechanism for underground heat exchange in the reinforcing bar cage of the cast-in-place pile according to claim 3, the pipe joint is positioned outside the outer diameter of the designed cast-in-place pile. A puffing member positioning puffer member 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 reinforcing bar cage of the cast-in-place pile according to claim 4, the pipe joint is positioned outside the outer diameter of the designed cast-in-place pile by the puffing member for positioning the pipe joint. Therefore, it is possible to prevent the pipe joint from entering the inside of the outer diameter of the cast-in-place pile and causing a cross-section loss, and it is possible to secure the design yield strength 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 attaching the underground heat exchange pipe according to claim 5 is the spacer for securing the cover thickness according to any one of claims 1 to 4, the pipe supporting annular hoop streak, and the pipe. A method for attaching a pipe for underground heat exchange, which attaches the pipe for underground heat exchange to the rebar cage having a support member, which is a pipe support for supporting the pipe for underground heat exchange wound in a loop shape. The gantry is set such 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 unwound toward the inside of 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 method for attaching the underground heat exchange pipe according to claim 5, when attaching the underground heat exchange pipe to the rebar cage, the pipe support stand that supports the underground heat exchange pipe wound in a loop shape. 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 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, in comparison with the case where the lower end of the loop of the underground heat exchange pipe is lower than the upper end of the casing, the angle of the underground heat exchange pipe sent from the pipe support stand near the upper end of the casing is It is possible to approach the direction (vertical direction), and 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 pipe installation mechanism and the method for attaching the underground heat exchange pipe of the present invention, it is possible to suppress damage to the underground heat exchange pipe.
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 pipe installation mechanism 10 for underground heat exchange according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8.
As shown in FIG. 1, an excavation hole 14 is formed in the ground 12, and a cylindrical casing 16 is installed inside the excavation hole 14. 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 rebar cage 18 is built inside the casing 16. The reinforced cage 18 is used for constructing a cast-in-place pile (a so-called concrete pile in which a reinforced cage and concrete are integrated) of a building by cast-in-place, and a plurality of them 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 method for forming the drill hole 14, a known method such as an earth drill method, a reverse circulation method, an all casing method, or the like 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 car 18 includes a plurality of pile hoop bars 21 formed in an annular shape on the outer circumference of a plurality of main bars 20 arranged in the circumferential direction along the axial direction of the reinforcing bar car 18. However, they are laid out at intervals in the axial direction. The main bar 20 and the pile hoop bar 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 spacer 22 for securing a cover thickness 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 ensuring spacer 22 includes a trapezoidal portion 22A and a mounting portion 22B integrally formed at an end of the trapezoidal portion 22A. As shown in FIG. 1, in the present embodiment, four cover thickness securing spacers 22 are arranged at intervals of 90 degrees, but the number of cover thickness securing spacers 22 is not limited to four. .. The cover thickness securing spacers 22 can be provided at intervals of 5 m in the axial direction of the reinforcing bar cage 18 as an example, 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 virtual annular line FL1 that passes through the outer peripheral side ends of the plurality of cover thickness securing spacers 22 is set to be slightly smaller than the inner diameter of the casing 16. There is. By providing the cover thickness securing spacer 22 in this way, it is possible to suppress the deviation between the center of the reinforcing bar car 18 and the center of the casing 16 (suppress eccentricity), and between the reinforcing bar car 18 and the wall surface of the casing 16. It is possible to provide an annular gap (cover thickness) S into which concrete is poured.
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 bar 20, a plurality of annular set-up bars 24 are axially arranged at different positions in the axial direction of the reinforcing bar car 18 from the pile hoop bar 21. It is arranged with a blank. The main bar 20 and the setup bar 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 periphery of the setup streak 24 by welding or the like. The support member 26 includes a trapezoidal portion 26A and a mounting portion 26B integrally formed at an end of the trapezoidal portion 26A. The height h of the support member 26 (measured in the radial direction of the rebar cage 18) is formed to be lower than the height H of the cover thickness securing spacer 22.
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, a pipe hoop reinforcement 21 and an annular hoop reinforcement 28 for pipe support having a diameter larger than that of the pile hoop reinforcement 21 and the setup reinforcement 24 are arranged on the outer side in the radial direction of the reinforcing steel cage 18. Has been done. The pipe supporting annular hoop muscle 28 is joined to the trapezoidal portion 26A of the supporting 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 muscle 28 is set to be smaller than the diameter D1 of the circular virtual annular line FL1 passing through the outer peripheral end of the cover thickness ensuring spacer 22. ..
When the diameter of the virtual annular line FL1 is D1, the outer diameter of the pipe supporting annular hoop muscle 28 is D2, and the diameter of the underground heat exchange pipe 30 described later is d, D1>D2+2d is satisfied. It 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, the plurality of pipe supporting annular hoop reinforcements 28 provided on the outer side in the radial direction of the reinforcing steel cage 18 have a plurality of axially extending outer peripheral sides (extending in the axial direction). 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 pipe 30 is locked to each pipe supporting annular hoop muscle 28 by using a binding band 32 or the like. As the binding band 32, Insulock (registered trademark), tie wrap (registered trademark), or the like can be used, for example.
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 locked to the pipe supporting annular hoop muscle 28 has a diameter of a circular virtual annular line FL1 passing through the outer peripheral side end of the cover thickness securing spacer 22. The underground heat exchange pipe 30 is arranged on the inner side in the direction, does not protrude radially outward from the virtual annular line FL1, and is smaller than the outer diameter D3 of the pile hoop reinforcement 21 and the setup reinforcement 24. It is supported by the pipe supporting annular hoop muscle 28 so as not to project inward in the radial direction.
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 the present embodiment, the designed outer diameter of the cast-in-place pile matches the outer diameter D4 of the pipe supporting annular hoop muscle 28. After the reinforced cage 18 to which the underground heat exchange pipe 30 is attached is built in the casing 16, concrete is poured and the concrete is solidified and integrated with the reinforced cage 18, and the cast-in-place pile (not shown). No)).
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 the concrete is poured into the casing 16, the gap between the pipe supporting annular hoop reinforcement 28 and the wall surface of the casing 16 is also filled with the concrete. Therefore, the outer diameter of the actual cast-in-place pile is designed. Larger than 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 outside diameter of the cast-in-place pile, and the concrete outside the designed outside diameter of the cast-in-place pile is cross-section missing by the underground heat exchange pipe 30. However, there is no problem because the design strength of the cast-in-place pile is secured. However, if the underground heat exchange pipe 30 may enter inside the designed outer diameter of the cast-in-place pile, the concrete inside the designed outer diameter may have a cross-section loss, and the cast-in-place pile. The design resistance of the may decrease. Therefore, it is necessary to prevent the underground heat exchange pipe 30 from entering inside the outer diameter of the cast-in-place pile in design.
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 the present embodiment, since the underground heat exchange pipe 30 is arranged outside the designed outer diameter of the cast-in-place pile (the same as the outer diameter D2 of the pipe supporting annular hoop muscle 28), the ground heat exchange pipe 30 is designed. It is possible to suppress the occurrence of cross-section defects in the concrete inside the outer diameter, and to secure the design yield strength 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 FIG. 2 and FIG. 6(A), the lower end of one underground heat exchange pipe 30 adjacent to each other and the lower end of the other underground heat exchange pipe 30 are connected by a pipe joint 34. ing. One of the underground heat exchange pipes 30 connected by the pipe joint 34 is a pipe for the outward route to which the heat medium is supplied, and the other underground heat exchange pipe 30 is for the return route to which the heat medium is returned. Functions as piping.
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 steel cage 18, but is gently bent near the lower end to bring the lower ends closer to each other. The pipe joint 34 has a substantially U-shaped flow path 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 the pipe joint protection member 36 so that the pipe joint 34 does not come into contact with the wall surface of the casing 16 and be damaged. Note that, in FIG. 2, the pipe joint protection member 36 is not shown.
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, and the lower end portion of the pipe joint 34 is an outer peripheral portion of the pipe supporting annular hoop streak 28 via a metal plate 38 made of a thick steel plate or the like. It is attached with a bolt or the like (not shown). The metal plate 38 is joined to the outer circumference of the pipe supporting annular hoop streak 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 soft metal plate 38 is set so that the pipe joint 34 does not enter inside the designed outer diameter D2 of the cast-in-place pile and the concrete inside the designed outer diameter does not have a cross-section loss. Has been done.
（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。
(Installation of underground heat exchange pipes to the rebar cage)
First, before attaching the underground heat exchange pipe 30 to the rebar cage 18, as shown in FIGS. 7 and 8, the long underground heat exchange pipe 30 wound in a roll shape is installed on the pipe support stand 40. Support.
The pipe support pedestal 40 is assembled in a turret shape with an iron pipe or the like, and a pair of support rods 40A for hooking the wound underground heat exchange pipe 30 project in the left and right horizontal directions. Therefore, the underground heat exchange pipe 30 wound in two rolls can be supported on the single pipe support stand 40.
In addition, on the pipe support stand 40, a stopper rod 42 extending in the lateral direction is provided above the support rod 40A so that the underground heat exchange pipe 30 wound in a roll shape does not bulge too much 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 stand 40 is set so that the lower end 30A of the underground heat exchange pipe 30 supported by the support rod 40A is located above the upper end 16A of the casing 16. Has been decided.
As shown in FIG. 7, in the present embodiment, three pipe support pedestals 40 are arranged near the casing 16 at equal intervals in the circumferential direction of the casing 16 so as to surround the casing 16. Note that, as an example, one worker 44 who sends the underground heat exchange pipe 30 from the pipe support gantry 40 can be arranged for one pipe support gantry 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 car 18 will be described.
(1) The ends of two underground heat exchange pipes 30 are attached to the pipe joint 34, and the pipe joint 34 and the pipe joint protection member 36 are suspended 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) The rebar cage 18 hung by the crane is gradually lowered into the casing 16, and the worker 44 (see FIG. 7) arranged near the pipe support stand 40 moves along the axial direction of the rebar cage 18. A worker 46 who unwinds the underground heat exchange pipe 30 from the pipe support cradle 40 toward the rebar cage 18 in order so that the underground heat exchange pipe 30 runs alongside, and arranges it in the vicinity of the casing 16 (see FIG. 7). Holds the middle portion of the underground heat exchange pipe 30 to the pipe supporting annular hoop muscle 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。
After that, the reinforcing bar cage 18 is lowered, and the intermediate portion of the underground heat exchange pipe 30 is sequentially locked to the pipe supporting annular hoop muscle 28 using the binding band 32. Note that the underground heat exchange pipe 30 is locked by stopping the lowering of the reinforcing bar car 18 at a position where the underground heat exchange pipe 30 is easily locked to the pipe supporting annular hoop muscle 28, It is performed by a worker 46 who is arranged near the casing 16.
In a state where the lowering of the reinforcing bar car 18 is stopped, the worker 44 also comes out in front of the reinforcing bar car 18 and performs the locking work similarly to 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 rebar cages 18 are lowered while sequentially being connected in the vertical direction. In a state where the lowering of the reinforcing bar car 18 is stopped, the worker 44 also comes out in front of the reinforcing bar car 18 and performs the locking work similarly to 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 worker 46 linearly supports the underground heat exchange pipe 30 so as not to bend or meander in the middle. In this manner, the underground heat exchange pipe 30 is locked to each pipe supporting annular hoop muscle 28.
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-height pipe support stand 48 shown on the right side of the casing 16, the lower end 30A of the ground heat exchange pipe 30 that is supported and wound in a roll shape is the casing 16 Since the unwinding underground heat exchange pipe 30 is lower than the upper end 16A of the casing 16 and has a large angle to the vertical direction in the vicinity of the upper end 16A of the casing 16 (the pipe support on the left side of the present embodiment In contrast to the gantry 40), the underground heat exchange pipe 30 is likely to rub against the inner corner of the upper end 16A of the casing 16, which may damage the underground heat exchange pipe 30.
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 stand 40 of the present embodiment shown on the left side of the casing 16 has a high height, and the ground heat exchange pipe 30 wound in a supported roll has a lower end 30A at the upper end 16A of the casing 16. Since it is located above 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. 8(B), in order to prevent the underground heat exchange pipe 30 from coming into contact with the inner corner of the upper end 16A of the casing 16, a protective mat 50 or the like for preventing contact is provided on the upper end 16A of the casing 16. It is desirable to cover the pipe 30 for underground heat exchange 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 they are 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 disposed inside the tip of the cover thickness securing spacer 22, the underground heat exchange pipe 30 is suppressed 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 (outer diameter D2 of the pipe supporting annular hoop muscle 28), the concrete inside the outer diameter is designed. It is possible to suppress the occurrence of cross-section loss in the steel and to secure the design yield strength 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 casing 16 side of the pipe joint 34 is covered with the pipe joint protection member 36, the pipe joint 34 is prevented from coming into contact with the wall surface of the casing 16 and being damaged. Further, since the pipe joint 34 is attached to the pipe supporting annular hoop muscle 28 via the metal member 38 so that the pipe joint 34 does not enter the inside of the designed outer diameter D2 of the cast-in-place pile, It is possible to suppress the occurrence of cross-sectional defects in concrete inside the designed outer diameter, and it is possible to secure the design yield 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。 It should be noted that by installing the number of annular hoop reinforcements 28 for supporting pipes in the axial direction of the rebar cage 18 larger than the number of spacers 22 for securing the cover thickness in the axial direction of the rebar cage 18, pipes arranged in the axial direction It is possible to increase the number of locking points of the underground heat exchange pipe 30 per unit length by narrowing the interval between the supporting annular hoop muscle 28 and the pipe supporting annular hoop muscle 28. 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 the present embodiment, since the underground heat exchange pipe 30 is locked to the annular pipe supporting annular hoop muscle 28, many underground heat exchange pipes 30 are desired in the circumferential direction of the pipe supporting annular hoop muscle 28. Can be easily locked in the position. 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 not limited to these embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the scope 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 embodiment, the cylindrical casing 16 is installed in the excavation hole 14, but the casing 16 may be installed as needed, and the installation of the casing 16 is not essential in the present invention.
In the above embodiment, the casing 16 is provided up to the bottom of the excavation hole 14, but the embodiment is not limited to this. For example, the casing 16 is only on the surface side of the excavation hole 14 (from the ground surface to the middle of the excavation hole 14). It may be provided in the.
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... Piping installation mechanism for underground heat exchange (Piping installation mechanism for underground heat exchange to the reinforcing bar cage of cast-in-place pile)
14... Excavation hole 16... Casing 18... Reinforcing bar basket 22... Cover thickness securing spacer 26... Support member FL1... Virtual annular line 28... Pipe supporting annular hoop muscle 30... Underground heat exchange pipe 32... Binding band 34... Pipe Fitting 36...Piping fitting protection member 38...Drained metal plate (Piping fitting positioning puffer member)
40...Piping support stand
Claims (5)
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。 Drill holes drilled in the ground, or cages built in a casing inserted in the ground,
A plurality of spacers for projecting to the outer periphery of the reinforcing bar cage and provided along the circumferential direction of the reinforcing bar cage, the excavation hole with the reinforcing bar cage, or a cover for securing a cover thickness to provide a gap between the reinforcing bar cage and the casing,
The cover for securing the cover thickness and the support member that is provided apart from each other in the axial direction of the rebar cage, and has a lower protruding height than the spacer for securing the cover thickness,
A plurality of pipe supporting annular hoop muscles, which are arranged inside a virtual annular line passing through the outer end portions of the plurality of cover thickness securing spacers and are supported by the supporting member,
A pipe for underground heat exchange, which is extended along the axial direction of the rebar cage and is locked to the plurality of pipe supporting annular hoops arranged inside the virtual annular line,
A pipe installation mechanism for underground heat exchange in a steel cage of cast-in-place piles.
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 path to which the heat exchange fluid is supplied and the lower end of the underground heat exchange pipe for the return path that returns the heat exchange fluid,
A pipe joint protection member that is attached to the reinforcing bar basket or the pipe supporting annular hoop, and covers the pipe joint from the drilling hole side,
The pipe installation mechanism for underground heat exchange in the reinforcing bar cage of the cast-in-place pile according to claim 1 or 2.
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 provided in the reinforcing bar cage provided with the cover thickness ensuring spacer according to any one of claims 1 to 4, the pipe supporting annular hoop bar, and the supporting member. A method of installing a pipe for underground heat exchange,
A pipe support stand that supports the underground heat exchange pipe wound in a loop, 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 into the casing. A method for mounting the underground heat exchange pipe, wherein the underground heat exchange pipe is unwound toward.
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