JP2013133584A - Method for installing reinforcing bar cage for cast-in-place pile and ground heat use heat exchange pipe for ground heat use - Google Patents

Method for installing reinforcing bar cage for cast-in-place pile and ground heat use heat exchange pipe for ground heat use Download PDF

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JP2013133584A
JP2013133584A JP2011282539A JP2011282539A JP2013133584A JP 2013133584 A JP2013133584 A JP 2013133584A JP 2011282539 A JP2011282539 A JP 2011282539A JP 2011282539 A JP2011282539 A JP 2011282539A JP 2013133584 A JP2013133584 A JP 2013133584A
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heat exchange
exchange pipe
reinforcing bar
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pile hole
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JP5961842B2 (en
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Masahiro Inoue
正博 井上
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Japan Pile Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a method for installing a reinforcing bar cage for cast-in-place pile and a ground heat use heat exchange pipe for improving heat exchange efficiency by installing a heat exchange pipe near a pile hole wall without damaging it.SOLUTION: Disclosed is a method for building a reinforcing bar cage 1 in a pile hole 2 and then installing a heat exchange pipe 5 for ground heat use in the pile body of a cast-in-place pile constructed by installing concrete, in which the heat exchange pipe 5 extending to an axial direction is mounted so as to freely oscillate along a vertical plane on the outer periphery of the reinforcing bar cage 1, and the reinforcing bar cage 1 is built in the pile hole 2, and the heat exchange pipe 5 is then moved to the pile hole wall side with a flow pressure due to the installation of concrete.

Description

この発明は、地中熱利用のための場所打ち杭用鉄筋籠及び地中熱利用熱交換パイプの設置方法に関し、より詳細には地中に築造される基礎構造物である場所打ち杭の杭体内部に熱交換パイプを設置して、構造物基礎としてのみならず地中熱を有効に利用する技術に関する。   BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing a cast-in-place pile rebar for use of underground heat and a heat exchange pipe using underground heat, and more particularly, a pile of cast-in-place pile that is a foundation structure built in the ground. The present invention relates to a technique for effectively using geothermal heat as well as a structure foundation by installing a heat exchange pipe inside the body.

季節によって変動する外気温に比べて、地中の温度は年間を通して約１５度Ｃと一定であり、この地中熱を例えば夏期には冷熱として、冬期には温熱として利用することが従来から行われている。   Compared to the outside air temperature that varies depending on the season, the underground temperature is constant at about 15 ° C throughout the year, and this underground heat is conventionally used as cold in the summer and as warm in the winter. It has been broken.

杭基礎は、本来は地上構造物を支持するためのものであるが、地中に設置されるものであることから、この杭基礎を利用して熱交換設備を設置することも提案されている。例えば、特許文献１〜３には、場所打ち杭の鉄筋籠に熱交換パイプを取付け、場所打ち杭の築造に伴って杭体内部に熱交換パイプを埋め込む地中熱利用システムが開示されている。   The pile foundation is originally intended to support the ground structure, but since it is installed in the ground, it is also proposed to install heat exchange equipment using this pile foundation. . For example, Patent Documents 1 to 3 disclose a geothermal heat utilization system in which a heat exchange pipe is attached to a reinforcing bar of a cast-in-place pile and the heat-exchange pipe is embedded in the pile body with the construction of the cast-in-place pile. .

しかしながら、これら特許文献に記載の技術は熱交換パイプを鉄筋籠に単に固定的に取り付けるものであることから、次のような問題点を指摘することができる。すなわち、場所打ち杭の築造にあたっては、地盤を掘削した杭穴に鉄筋籠を建て込んだ後、杭穴にコンクリートを打設するのであるが、一般には鉄筋籠の外周と杭穴壁との間にはコンクリートのかぶり厚を確保するために所定大きさの間隙が形成される。   However, since the techniques described in these patent documents simply attach the heat exchange pipe to the reinforcing bar rod, the following problems can be pointed out. In other words, in the construction of cast-in-place piles, after reinforcing bars are built into the pile holes excavated from the ground, concrete is placed in the pile holes, but generally between the outer periphery of the reinforcing bar fences and the pile hole walls. A gap having a predetermined size is formed in order to secure a concrete cover thickness.

したがって、熱交換パイプを鉄筋籠の内周に配置する場合はもちろん、外周に配置する場合であっても、熱交換パイプは杭穴壁から離間した位置に設置されることになる。その結果、熱交換パイプと杭穴壁すなわち地盤との間には熱伝導性が低いコンクリートが介在することになり、熱交換効率が悪いという問題がある。   Therefore, not only when the heat exchange pipe is arranged on the inner periphery of the reinforcing bar, but also when the heat exchange pipe is arranged on the outer periphery, the heat exchange pipe is installed at a position separated from the pile hole wall. As a result, concrete having low thermal conductivity is interposed between the heat exchange pipe and the pile hole wall, that is, the ground, and there is a problem that the heat exchange efficiency is poor.

鉄筋籠の外周に熱交換パイプを配置する場合、熱交換パイプを鉄筋籠から外方に離間させて杭穴壁近くに位置するように取り付けることも考えられる（特許文献２参照）。しかしながら、このような取付け形態とすると、鉄筋籠の杭穴への建て込み時に熱交換パイプが杭穴壁に摺接して損傷するおそれがあり、かかる場合はそのパイプを熱交換用として使用できなくなる。また、同時に杭穴壁も損傷するおそれがあり、それによってスライムの発生を招くことになる。   When arranging the heat exchange pipe on the outer periphery of the reinforcing bar rod, it is also conceivable to attach the heat exchange pipe so as to be located close to the pile hole wall while being spaced outward from the reinforcing bar rod (see Patent Document 2). However, with such a mounting configuration, there is a risk that the heat exchanging pipe slides against the pile hole wall when the reinforcing bar is installed in the pile hole, and in such a case, the pipe cannot be used for heat exchange. . At the same time, the pile hole wall may be damaged, thereby causing slime.

特開２００４−３２４９１３号公報JP 2004-324913 A 特開２００４−３３２３３０号公報JP 2004-332330 A 特開２００４−３３３００１号公報JP 2004-333001 A

この発明は上記のような技術的背景に基づいてなされたものであって、次の目的を達成するものである。
この発明の目的は、場所打ち杭を用いた地中熱利用システムにおいて、熱交換パイプを損傷することなく杭穴壁近くに設置することができ、これによって熱交換効率を高めることができる、場所打ち杭用鉄筋籠及び地中熱利用熱交換パイプの設置方法を提供することにある。 The present invention has been made based on the technical background as described above, and achieves the following object.
An object of the present invention is a ground heat utilization system using a cast-in-place pile, which can be installed near a pile hole wall without damaging a heat exchange pipe, thereby improving the heat exchange efficiency. The object of the present invention is to provide a method for installing a reinforcing bar for driving pile and a heat exchange pipe using underground heat.

この発明は上記課題を達成するために、次のような手段を採用している。
すなわち、この発明は、杭穴に建て込まれる場所打ち杭用の鉄筋籠であって、
該鉄筋籠の外周に、その軸方向に延びる熱交換パイプを鉛直面に沿って揺動自在に取付けたことを特徴とする地中熱利用のための場所打ち杭用鉄筋籠にある。 The present invention employs the following means in order to achieve the above object.
That is, this invention is a steel bar for a cast-in-place pile built in a pile hole,
A cast-in-place pile reinforcing bar for use of underground heat is characterized in that a heat exchange pipe extending in the axial direction is attached to the outer periphery of the reinforcing bar so as to be swingable along a vertical plane.

この場合、揺動による前記熱交換パイプの水平方向移動大きさを、鉄筋籠外周から杭穴壁に当接することが可能な大きさ以上とする構成を採用することができる。   In this case, it is possible to adopt a configuration in which the horizontal movement size of the heat exchange pipe due to the swing is set to be larger than the size capable of coming into contact with the pile hole wall from the outer periphery of the reinforcing bar rod.

前記熱交換パイプは、線条体あるいは索条体を介して軸方向に間隔を置いた複数箇所で前記鉄筋籠に取り付けられている構成を採用することができる。あるいは、前記熱交換パイプは、リンク機構を介して軸方向に間隔を置いた複数箇所で前記鉄筋籠に取り付けられている構成を採用することができる。   The said heat exchange pipe can employ | adopt the structure attached to the said reinforcing bar rod in the several places spaced apart to the axial direction via a linear body or a cable body. Alternatively, the heat exchange pipe can be configured to be attached to the reinforcing bar rod at a plurality of positions spaced in the axial direction via a link mechanism.

また、この発明は、杭穴に鉄筋籠を建て込んだ後、コンクリートを打設して築造される場所打ち杭の杭体内部に地中熱利用のための熱交換パイプを設置する方法であって、
前記鉄筋籠の外周に、その軸方向に延びる熱交換パイプを鉛直面に沿って揺動自在に取付けおき、
前記鉄筋籠を杭穴に建て込こんだ後、コンクリートの打設による流動圧によって前記熱交換パイプを杭穴壁側に移動させることを特徴とする地中熱利用熱交換パイプの設置方法にある。 In addition, the present invention is a method of installing a heat exchange pipe for use of underground heat inside a pile body of a cast-in-place pile that is built by placing concrete in a pile hole and then casting concrete. And
A heat exchange pipe extending in the axial direction is attached to the outer periphery of the reinforcing bar so as to be swingable along a vertical plane,
After installing the steel bar in the pile hole, the heat exchange pipe is moved to the pile hole wall side by the flow pressure by placing concrete. .

また、この発明は、杭穴に鉄筋籠を建て込んだ後、コンクリートを打設して築造される場所打ち杭の杭体内部に地中熱利用のための熱交換パイプを設置する方法であって、
前記鉄筋籠の外周に、その軸方向に延びる熱交換パイプを鉛直面に沿って揺動自在となるように、軸方向に間隔を置いた複数のリンク機構を介して取付けておき、
前記熱交換パイプを上方に引き上げて上方位置に保持した状態で前記鉄筋籠を杭穴に建て込み、
鉄筋籠の建て込み後、前記保持を解除して熱交換パイプを下降させることによって該熱交換パイプを杭穴壁側に移動させることを特徴とする地中熱利用熱交換パイプの設置方法にある。 In addition, the present invention is a method of installing a heat exchange pipe for use of underground heat inside a pile body of a cast-in-place pile that is built by placing concrete in a pile hole and then casting concrete. And
A heat exchange pipe extending in the axial direction is attached to the outer periphery of the reinforcing bar rod through a plurality of link mechanisms spaced in the axial direction so as to be swingable along a vertical plane.
In the state where the heat exchange pipe is pulled up and held at the upper position, the reinforcing bar is built into the pile hole,
After the rebar is built, the heat exchange pipe is moved to the pile hole wall side by releasing the holding and lowering the heat exchange pipe. .

上記各設置方法において、揺動による前記熱交換パイプの水平方向移動大きさを、鉄筋籠外周から杭穴壁に当接することが可能な大きさ以上とすることが好ましい。
In each of the above installation methods, it is preferable that the horizontal movement size of the heat exchange pipe by swinging is greater than or equal to the size capable of coming into contact with the pile hole wall from the outer periphery of the reinforcing bar rod.

この発明によれば、熱交換パイプを鉄筋籠の外周に鉛直面に沿って揺動自在に取り付けたので、熱交換パイプを水平方向に移動させることにより杭穴壁すなわち地盤に当接する位置に設置することができる。したがって、地中熱との熱交換をコンクリートをほとんど介せずに直接行わせることができ、熱交換効率を高めることができる。しかも、鉄筋籠の建て込みの際は、熱交換パイプは鉄筋籠に沿うようにこれに接近して杭穴壁から離間した位置にあるので、建て込みによって杭穴壁に摺接することがなく損傷を防止することができ、熱交換機能を損なうことがない。また、杭穴壁も損傷することがない。   According to this invention, since the heat exchange pipe is swingably attached to the outer periphery of the reinforcing bar along the vertical plane, the heat exchange pipe is installed in a position where it abuts against the pile hole wall, that is, the ground by moving the heat exchange pipe in the horizontal direction. can do. Therefore, the heat exchange with the underground heat can be performed directly with almost no concrete, and the heat exchange efficiency can be increased. Moreover, when the reinforcing bar is installed, the heat exchange pipe is close to the reinforcing bar so that it is located away from the pile hole wall, so that it will not be slid into contact with the pile hole wall. Can be prevented and the heat exchange function is not impaired. Moreover, the pile hole wall is not damaged.

この発明の実施形態を示す鉛直方向断面図である。It is a perpendicular direction sectional view showing an embodiment of this invention. 同実施形態のものの水平方向断面図である。It is a horizontal direction sectional view of the thing of the embodiment. 熱交換パイプを鉄筋籠に揺動自在に取り付けるための手段の実施形態を拡大して示す正面図である。It is a front view which expands and shows embodiment of the means for attaching a heat exchange pipe to a reinforcing bar so that rocking is possible. 熱交換パイプを鉄筋籠に揺動自在に取り付けるための手段の別の実施形態を拡大して示す図であり、（ａ）は正面図、（ｂ）は平面図である。It is a figure which expands and shows another embodiment of the means for attaching a heat exchange pipe to a reinforcing bar so that rocking is possible, (a) is a front view, (b) is a top view. 打設コンクリートの挙動を模式的に示す図である。It is a figure which shows typically the behavior of placement concrete. 受圧板を取り付けた熱交換パイプを示す正面図である。It is a front view which shows the heat exchange pipe which attached the pressure receiving plate. 熱交換パイプの設置方法の別の実施形態を示す鉛直方向断面図である。It is vertical direction sectional drawing which shows another embodiment of the installation method of a heat exchange pipe.

この発明の実施形態を図面を参照しながら以下に説明する。図１，図２は、この発明による場所打ち杭用鉄筋籠の実施形態を示している。場所打ち杭工法には、主として掘削形態の違いによりオールケーシング工法、アースドリル工法、リバースサーキュレーション工法等の工法があるが、この発明はいずれの工法にも適用できる。図１，図２はベントナイト液等の安定液を満たしながら掘削した杭穴２に鉄筋籠１を建て込んだ状態を示している。この鉄筋籠１の建て込み後、トレミー管（後述する）を介して、杭穴２にコンクリートを打設して硬化させ、場所打ち杭が築造される。   Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a cast-in-place pile reinforcing bar according to the present invention. The cast-in-place pile construction method includes construction methods such as an all-casing construction method, an earth drill construction method, and a reverse circulation construction method mainly depending on the excavation form, but this invention can be applied to any construction method. 1 and 2 show a state in which a reinforcing bar 1 is installed in a pile hole 2 excavated while being filled with a stabilizing liquid such as bentonite liquid. After the reinforcement bar 1 is built, concrete is placed in the pile hole 2 and hardened through a tremy pipe (described later), and a cast-in-place pile is built.

鉄筋籠１は、全体として円筒形となるように周方向に間隔を置いて配置された多数の主筋３と、これら主筋３群を囲むように軸方向に間隔を置いて多数配置されたフープ筋４とで構成されている。この鉄筋籠１の外周に周方向に間隔を置いて、軸方向に延びる複数の熱交換パイプ５が取り付けられている。熱交換パイプ５は、地中熱と熱交換するための熱媒体の流路を形成するＵ字形のパイプであり、先端の曲管部を境に一方が送り管５ａ、他方が戻り管５ｂを形成している。   Reinforcing bar 1 is a large number of main bars 3 spaced apart in the circumferential direction so as to form a cylindrical shape as a whole, and a large number of hoop bars arranged at intervals in the axial direction so as to surround these three groups of main bars. 4. A plurality of heat exchange pipes 5 extending in the axial direction are attached to the outer periphery of the reinforcing bar 1 at intervals in the circumferential direction. The heat exchange pipe 5 is a U-shaped pipe that forms a flow path of a heat medium for exchanging heat with underground heat. One is a feed pipe 5a and the other is a return pipe 5b with a bent pipe portion at the tip as a boundary. Forming.

この発明によれば、熱交換パイプ５は鉄筋籠１に鉛直面に沿って揺動自在に取り付けられている。図１，図２に示す実施形態では熱交換パイプ５を揺動自在とするために、熱交換パイプ５は針金などの線条体６を介して、軸方向に間隔を置いた複数箇所で鉄筋籠１に取り付けられている。具体的には、図３に拡大して示すように、線条体６は一端がフープ筋４に結び付けられ、他端が熱交換パイプ５の送り管５ａ及び戻り管５ｂに結び付けられている。これにより、熱交換パイプ５は線条体６の長さ範囲で鉛直面に沿って揺動自在となる。熱交換パイプ５の鉄筋籠１への取付けは、線条体６に代えてワイヤーロープやチェーンなどの索条体を使用してもよい。   According to this invention, the heat exchange pipe 5 is attached to the reinforcing bar 1 so as to be swingable along the vertical plane. In the embodiment shown in FIGS. 1 and 2, in order to make the heat exchange pipe 5 swingable, the heat exchange pipe 5 is reinforced at a plurality of positions spaced in the axial direction via a wire body 6 such as a wire. It is attached to 籠 1. Specifically, as shown in an enlarged view in FIG. 3, one end of the linear body 6 is connected to the hoop line 4, and the other end is connected to the feed pipe 5 a and the return pipe 5 b of the heat exchange pipe 5. As a result, the heat exchange pipe 5 can swing along the vertical plane within the length range of the filament 6. For the attachment of the heat exchange pipe 5 to the reinforcing bar 1, a wire body such as a wire rope or a chain may be used instead of the wire body 6.

図４は、熱交換パイプ５を鉄筋籠１に揺動自在に取り付けるための手段の別の実施形態を示している。この実施形態では、熱交換パイプ５はリンク機構７を介して、軸方向に間隔を置いた複数箇所で鉄筋籠１に取り付けられている。リンク機構７は１対の分岐部８ａ，８ｂを有するリンクプレート８と、鉄筋籠１の主筋３（フープ筋でもよい）に取り付けられた支持部材９と、熱交換パイプ５の送り管５ａ，５ｂのそれぞれに取り付けられた支持部材１０で構成されている。そして、リンクプレート８の一端は支持部材９にピン１１を介して枢支され、分岐部８ａ，８ｂ側の他端は支持部材１０にピン１２を介して枢支されている。これにより、熱交換パイプ５はリンクプレート８の長さ範囲で鉛直面に沿って揺動自在となる。   FIG. 4 shows another embodiment of the means for swingably attaching the heat exchange pipe 5 to the reinforcing bar 1. In this embodiment, the heat exchange pipe 5 is attached to the reinforcing bar 1 at a plurality of positions spaced in the axial direction via the link mechanism 7. The link mechanism 7 includes a link plate 8 having a pair of branch portions 8a and 8b, a support member 9 attached to the main bar 3 (or a hoop bar) of the reinforcing bar 1, and feed pipes 5a and 5b of the heat exchange pipe 5. It is comprised by the supporting member 10 attached to each of these. One end of the link plate 8 is pivotally supported on the support member 9 via a pin 11, and the other end on the branching portions 8 a and 8 b side is pivotally supported on the support member 10 via a pin 12. As a result, the heat exchange pipe 5 can swing along the vertical plane within the length range of the link plate 8.

鉄筋籠１は熱交換パイプ５が図３，図４に示すように下方に垂れ下がった状態で杭穴２に建て込まれる。この建て込みの際、杭穴２に満たされている安定液によって熱交換パイプ５に浮力が生じて浮き上がらないようにする。熱交換パイプ５に浮力に抗する自重があればそのままでもよいが、一般には熱交換パイプ５に水等の液体を入れるか、あるいは重錘を取り付けるようにする。   The reinforcing bar 1 is built in the pile hole 2 with the heat exchange pipe 5 hanging downward as shown in FIGS. At the time of this erection, buoyancy is generated in the heat exchange pipe 5 by the stabilizing liquid filled in the pile hole 2 so as not to rise. If the heat exchange pipe 5 has its own weight against buoyancy, the heat exchange pipe 5 may be used as it is. However, in general, a liquid such as water is put in the heat exchange pipe 5 or a weight is attached.

鉄筋籠１の建て込み後、杭穴２にコンクリートを打設するのであるが、図５はそのときのコンクリートの様子を模式的に示している。コンクリートは杭穴２の中心に挿入配置されるトレミー管１３を上方に徐々に引き上げながら、杭穴２の底部から打設される。このため、打設されたコンクリート１４は当初、山形形状を呈するがその後、杭穴２の中心から側方（杭穴２の半径方向外方）に向けて矢印Ａで示すように流動する。このコンクリートの流動圧によって、鉄筋籠１に揺動自在に取り付けられた熱交換パイプ５は杭穴２の穴壁側に水平方向に移動する（図１，図２参照）。水平移動した熱交換パイプ５はその位置でコンクリートの硬化によって固定される。   After the reinforcement bar 1 is built, concrete is placed in the pile hole 2, and FIG. 5 schematically shows the state of the concrete at that time. The concrete is placed from the bottom of the pile hole 2 while gradually lifting the tremy pipe 13 inserted and arranged in the center of the pile hole 2 upward. For this reason, the placed concrete 14 initially has a mountain shape, but then flows as indicated by an arrow A from the center of the pile hole 2 toward the side (radially outward of the pile hole 2). Due to the flow pressure of the concrete, the heat exchange pipe 5 swingably attached to the reinforcing bar 1 moves in the horizontal direction toward the hole wall side of the pile hole 2 (see FIGS. 1 and 2). The horizontally-moved heat exchange pipe 5 is fixed at that position by hardening of the concrete.

熱交換パイプ５内の熱媒体と地中熱との熱交換効率を高めるには、熱交換パイプ５が杭穴２の穴壁に近ければ近いほうがよく、穴壁に当接しているのが最もよい設置形態である。このような設置形態にするには、熱交換パイプ５の揺動による水平方向移動大きさが、鉄筋籠１の外周から杭穴２の穴壁に当接することが可能な大きさ以上となるように、線条体６あるいはリンクプレート８の長さを設定すればよい。そして、線条体６やリンクプレート８は、その長さを長くするほど穴壁に当接するまでの鉛直方向の変位を小さくすることができる。   In order to increase the heat exchange efficiency between the heat medium in the heat exchange pipe 5 and the underground heat, it is better that the heat exchange pipe 5 is closer to the hole wall of the pile hole 2 and is most in contact with the hole wall. It is a good installation form. In order to achieve such an installation form, the horizontal movement magnitude due to the swinging of the heat exchange pipe 5 is greater than the magnitude capable of coming into contact with the hole wall of the pile hole 2 from the outer periphery of the reinforcing bar 1. In addition, the length of the filament 6 or the link plate 8 may be set. And the linear body 6 and the link plate 8 can make the displacement of the perpendicular direction until it contact | abuts to a hole wall so that the length is lengthened small.

図６は、熱交換パイプ５に受圧板１５を設けた実施形態を示している。受圧板１５は熱交換パイプ５の高さ方向に間隔を置いた複数箇所に取り付けられる。各箇所の受圧板１５は２枚の板からなり、これらの板は送り管５ａ，５ｂの双方を挟み込むように配置されて、ボルト１６等で互いに固定されている。このような受圧板１５を取り付けることにより、コンクリートの流動圧を受ける面積が大きくなり、熱交換パイプ５を側方に移動させる力を大きくすることができる。   FIG. 6 shows an embodiment in which a pressure receiving plate 15 is provided on the heat exchange pipe 5. The pressure receiving plate 15 is attached to a plurality of locations at intervals in the height direction of the heat exchange pipe 5. The pressure receiving plate 15 at each location is composed of two plates, which are arranged so as to sandwich both the feed tubes 5a and 5b, and are fixed to each other by bolts 16 or the like. By attaching such a pressure receiving plate 15, the area which receives the flow pressure of concrete becomes large, and the force which moves the heat exchange pipe 5 to a side can be enlarged.

図７は、熱交換パイプをリンク機構を介して鉄筋籠に取り付けた場合の、設置方法の別の実施形態を示している。この実施形態では、熱交換パイプ５を上方に引き上げ、その上端を鉄筋籠１の頂部に仮止めする等して上方位置に保持し、その状態で鉄筋籠１を杭穴２に建て込む。鉄筋籠１の建て込み後、熱交換パイプ５の保持を解除すると、熱交換パイプ５は自重や重錘の作用により下降するが、下降に伴って水平方向に移動し、杭穴２の穴壁に当接してその位置に留まることになる。したがって、この場合はコンクリートの打設による流動圧の利用は不要であり、受圧板１５も不要である。   FIG. 7 shows another embodiment of the installation method in the case where the heat exchange pipe is attached to the reinforcing bar via the link mechanism. In this embodiment, the heat exchanging pipe 5 is pulled upward, the upper end of the heat exchanging pipe 5 is temporarily fixed to the top of the reinforcing bar 1 and held at the upper position, and the reinforcing bar 1 is built in the pile hole 2 in this state. When the holding of the heat exchanging pipe 5 is released after the reinforcing bar 1 is built, the heat exchanging pipe 5 descends due to its own weight or the action of the weight, but as it descends, it moves in the horizontal direction, and the hole wall of the pile hole 2 Will stay in that position. Therefore, in this case, it is not necessary to use the fluid pressure by placing concrete, and the pressure receiving plate 15 is also unnecessary.

以上のように、この発明によれば、場所打ち杭において熱交換パイプ５を杭穴壁すなわち地盤に当接する位置に設置することができ、地中熱との熱交換をコンクリートをほとんど介せずに直接行わせることができ、熱交換効率を高めることができる。しかも、鉄筋籠の建て込みの際は、熱交換パイプ５は鉄筋籠１に接近して杭穴壁から離間した位置にあるので、建て込みによって杭穴壁に摺接することがなくその損傷を防止することができる。また、杭穴壁も損傷することがない。   As described above, according to the present invention, in the cast-in-place pile, the heat exchange pipe 5 can be installed at a position in contact with the pile hole wall, that is, the ground, and the heat exchange with the underground heat hardly passes through the concrete. The heat exchange efficiency can be increased. Moreover, when the reinforcing bar is installed, the heat exchange pipe 5 is located close to the reinforcing bar 1 and away from the pile hole wall, so that it does not slide against the pile hole wall and prevents damage. can do. Moreover, the pile hole wall is not damaged.

１ 鉄筋籠
２ 杭穴
３ 主筋
４ フープ筋
５ 熱交換パイプ
６ 線条体
７ リンク機構
１１ トレミー管
１５ 受圧板 DESCRIPTION OF SYMBOLS 1 Reinforcement rod 2 Pile hole 3 Main reinforcement 4 Hoop reinforcement 5 Heat exchange pipe 6 Striated body 7 Link mechanism 11 Tremy pipe 15 Pressure receiving plate

Claims (7)

杭穴に建て込まれる場所打ち杭用の鉄筋籠であって、
該鉄筋籠の外周に、その軸方向に延びる熱交換パイプを鉛直面に沿って揺動自在に取付けたことを特徴とする地中熱利用のための場所打ち杭用鉄筋籠。 It is a steel bar for cast-in-place piles built in a pile hole,
A cast-in-place pile reinforcement rod for use in underground heat, characterized in that a heat exchange pipe extending in the axial direction is attached to the outer periphery of the reinforcement rod so as to be swingable along a vertical plane. 揺動による前記熱交換パイプの水平方向移動大きさを、鉄筋籠外周から杭穴壁に当接することが可能な大きさ以上としたことを特徴とする請求項１記載の地中熱利用のための場所打ち杭用鉄筋籠。   2. The use of underground heat according to claim 1, wherein the horizontal movement size of the heat exchange pipe due to rocking is set to be larger than the size capable of contacting the pile hole wall from the outer periphery of the reinforcing bar rod. Reinforcing bar for cast-in-place piles. 前記熱交換パイプは、線条体あるいは索条体を介して軸方向に間隔を置いた複数箇所で前記鉄筋籠に取り付けられていることを特徴とする請求項１又は２記載の地中熱利用のための場所打ち杭用鉄筋籠。   3. The use of underground heat according to claim 1, wherein the heat exchange pipe is attached to the reinforcing bar rod at a plurality of positions spaced in the axial direction via a linear body or a cable body. For cast-in-place piles. 前記熱交換パイプは、リンク機構を介して軸方向に間隔を置いた複数箇所で前記鉄筋籠に取り付けられていることを特徴とする請求項１又は２記載の地中熱利用のための場所打ち杭用鉄筋籠。   3. The cast-in-place for use of underground heat according to claim 1 or 2, wherein the heat exchange pipe is attached to the rebar bar at a plurality of positions spaced in the axial direction via a link mechanism. Reinforcing bar for piles. 杭穴に鉄筋籠を建て込んだ後、コンクリートを打設して築造される場所打ち杭の杭体内部に地中熱利用のための熱交換パイプを設置する方法であって、
前記鉄筋籠の外周に、その軸方向に延びる熱交換パイプを鉛直面に沿って揺動自在に取付けおき、
前記鉄筋籠を杭穴に建て込こんだ後、コンクリートの打設による流動圧によって前記熱交換パイプを杭穴壁側に移動させることを特徴とする地中熱利用熱交換パイプの設置方法。 It is a method of installing a heat exchange pipe for use of underground heat inside the pile body of a cast-in-place pile built by placing concrete rods in the pile hole and then casting concrete.
A heat exchange pipe extending in the axial direction is attached to the outer periphery of the reinforcing bar so as to be swingable along a vertical plane,
An installation method of a heat exchange pipe using geothermal heat, wherein the heat exchanging pipe is moved to the pile hole wall side by fluid pressure generated by placing concrete after the reinforcing bar is built in the pile hole. 杭穴に鉄筋籠を建て込んだ後、コンクリートを打設して築造される場所打ち杭の杭体内部に地中熱利用のための熱交換パイプを設置する方法であって、
前記鉄筋籠の外周に、その軸方向に延びる熱交換パイプを鉛直面に沿って揺動自在となるように、軸方向に間隔を置いた複数のリンク機構を介して取付けておき、
前記熱交換パイプを上方に引き上げて上方位置に保持した状態で前記鉄筋籠を杭穴に建て込み、
鉄筋籠の建て込み後、前記保持を解除して熱交換パイプを下降させることによって該熱交換パイプを杭穴壁側に移動させることを特徴とする地中熱利用熱交換パイプの設置方法。 It is a method of installing a heat exchange pipe for use of underground heat inside the pile body of a cast-in-place pile built by placing concrete rods in the pile hole and then casting concrete.
A heat exchange pipe extending in the axial direction is attached to the outer periphery of the reinforcing bar rod through a plurality of link mechanisms spaced in the axial direction so as to be swingable along a vertical plane.
In the state where the heat exchange pipe is pulled up and held at the upper position, the reinforcing bar is built into the pile hole,
A method of installing a heat exchange pipe using geothermal heat, wherein the heat exchange pipe is moved to the pile hole wall side by releasing the holding and lowering the heat exchange pipe after the reinforcement bar is built. 揺動による前記熱交換パイプの水平方向移動大きさを、鉄筋籠外周から杭穴壁に当接することが可能な大きさ以上としたことを特徴とする請求項５又は６記載の地中熱利用熱交換パイプの設置方法。   The use of underground heat according to claim 5 or 6, wherein the horizontal movement size of the heat exchanging pipe due to rocking is greater than or equal to the size capable of coming into contact with the pile hole wall from the outer periphery of the reinforcing bar rod. How to install heat exchange pipes.
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