JP2012037161A - Method of executing heat gathering piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of executing heat gathering piping which can reduce the number of components while securing the filling property of concrete and prevent heat gathering piping damage due to chipping work.SOLUTION: A pile hole 2 is formed by excavating ground while letting excavated soil aside to the side of a hole wall 2A; concrete is press-fitted from a leading end portion of a rod 74 while raising the rod 74 of an excavating machine 7 after the rod 74 of the excavating machine 7 reaches target depth; concrete is filled to the pile hole 2 in an uncured state; after the rod 74 of excavating machine is drawn from the pile hole, a reinforced concrete basket 3 in which heat gathering piping 5 is placed with respect to the pile hole 2 is inserted before uncured concrete is cured; and then, the concrete is cured to form a foundation pile 1.

Description

  The present invention relates to a heat collection piping construction method using geothermal heat.

  A technique that uses underground heat by burying heat collection pipes in the ground that is maintained at a constant temperature throughout the year and exchanging heat through a heat medium circulating inside the heat collection pipe is widely adopted. ing. As a method of burying a heat collecting pipe in the ground, a method of digging a hole in the ground with a boring machine or the like and burying the heat collecting pipe is known. However, in such a construction method, since a dedicated hole for embedding the heat collecting pipe is constructed, it is necessary to secure the site, which increases the number of man-hours, leading to an increase in cost and a prolonged construction period. There is.

  In order to solve this problem, conventionally, a method of attaching a heat collecting pipe to the inside of a reinforcing steel bar constituting the cast-in-place foundation pile and burying the heat collecting pipe together with the foundation pile has been performed. In this construction method, a pile hole is excavated in the ground, a reinforcing bar is installed in the excavated pile hole, and then a concrete pile is constructed by placing concrete inside the pile hole using a treme tube. However, in the construction method in which the heat collection pipe is attached inside the reinforcing bar, the concrete is placed after the reinforcing bar is installed in the excavated pile hole. For this reason, there is a problem that the filling property of the concrete deteriorates unless a sufficient distance is provided between the reinforcing bar provided in the reinforcing bar rod and the heat collecting pipe.

  Then, the heat collection piping construction method which can take sufficient distance between the reinforcing bar of a reinforcing bar and heat collection piping is disclosed (for example, refer patent document 1). In this heat collection piping construction method, a heat collection pipe is installed by arranging reinforcing bars for supporting the heat collection pipe inside the reinforcing bar to construct the cast-in-place foundation pile.

JP 2004-333001 A

  In the heat collecting pipe construction method disclosed in Patent Document 1, the heat collecting pipe is supported by the reinforcing bar for supporting the heat collecting pipe, thereby sufficiently increasing the distance between the reinforcing bar and the heat collecting pipe. This prevents the deterioration of concrete filling properties. However, reinforcing bars are arranged inside the reinforcing bar rods to support the heat collection pipe. For this reason, there existed a problem that the number of parts for the reinforcing bar which supports heat collection piping will increase.

  Moreover, in the heat collection piping construction method disclosed in Patent Document 1, when a foundation pile is formed, the pile wall collapses inside the pile hole after excavating the pile hole and before placing concrete. It is common to inject a stabilizing solution to prevent the above. In the stabilizing liquid injected into the pile hole, the particles of the cutting soil in the stabilizing liquid settle on the pile bottom of the pile hole to generate slime. This slime has a great adverse effect on the strength of the foundation pile and causes the production of defective concrete with low strength.

  The low-strength defective concrete rises with the placement of the concrete, and is formed in a form that is pulled out from above the pile hole after the concrete placement in the pile hole is completed. The defective concrete is scraped off by a lifting operation. However, when the lifting operation is performed, there is a problem that the heat collecting pipe having low strength may be damaged together with the concrete.

  Then, the subject of this invention is providing the heat collection piping construction method which can prevent damage to the heat collection piping accompanying a suspension operation | work while reducing the number of parts, ensuring the filling property of concrete.

  A heat collecting piping construction method according to the present invention that solves the above-mentioned problems is a heat collecting piping construction method in which a heat collecting pipe is arranged inside a cast-in-place foundation pile, and the excavator rod is lowered and excavated. The soil is excavated to the hole wall side and the ground is excavated to form a pile hole. After the excavator rod reaches the target depth, concrete is pressed from the tip of the rod while lifting the excavator rod, and the pile hole After the concrete is filled in an uncured state and the rod of the excavator is pulled out from the pile hole, before the uncured concrete is hardened, a reinforcing bar with heat collecting pipes is inserted into the pile hole, After that, the concrete is hardened to generate a foundation pile.

  In the heat collecting pipe construction method according to the present invention, the concrete is filled in the pile hole in an uncured state, and the reinforcing bar with the heat collecting pipe is inserted into the pile hole before the uncured concrete is hardened. ing. For this reason, for example, a support member is not provided, and a heat collecting pipe is not provided at a position far from the reinforcing bar of the reinforcing bar rod, and even when directly attached to the reinforcing frame of the reinforcing bar rod, the filling property of the concrete is not deteriorated. Can do. Therefore, the number of parts can be reduced while ensuring the filling property of the concrete.

  Further, in the heat collecting piping construction method according to the present invention, the excavator rod is excavated into the hole wall side to excavate the ground to form a pile hole, and after the excavator rod reaches the target depth, the excavator rod is The foundation pile is constructed by pressing the concrete from the tip of the rod while pulling up. For this reason, since the foundation pile can be constructed without injecting the stabilizing liquid, the lifting work of the defective concrete caused by the injection of the stabilizing liquid becomes unnecessary. Therefore, it is possible to suitably prevent damage to the heat collecting pipe accompanying the lifting operation.

  Here, it can be set as the aspect which is one rebar rod inserted in a pile hole.

  Thus, since there is one reinforcing bar rod inserted into the pile hole, when inserting into the pile hole of the reinforcing rod rod, the joining operation of the reinforcing bar rod becomes unnecessary. Further, when joining the reinforcing bar rods, it is necessary to connect a heat collecting pipe. However, since there is one reinforcing bar rod, it is not necessary to connect the heat collecting pipe. In particular, the connection of the rebar rod and the connection of the heat collection pipe are often performed by different contractors, so that the contractor who connects the rebar rod and the contractor who connects the heat collection pipe are disturbed at the construction site. Can be prevented, and can greatly contribute to prevention of prolongation of the construction period.

  The reinforcing bar rod includes a plurality of main bars extending in the height direction, and the plurality of main bars are arranged in a circumferential shape in plan view with the reinforcing bar rod inserted into the pile hole. A hoop line is provided around the heat pipe, and the heat collecting pipe can be arranged inside the hoop line.

  Thus, in order to ensure the specified cover thickness, as in the case where the heat collection pipe is arranged outside the hoop line, the heat collection pipe is arranged inside the hoop line. This can be done without increasing the pile diameter.

  Further, the hoop muscles may be arranged in a spiral manner around the plurality of main muscles.

  Thus, by providing the hoop bars arranged in a spiral manner around the plurality of main bars, the reinforcing bar rod becomes a truss beam shape and the rigidity (resistance to deformation of the cage) is improved. For this reason, when inserting the reinforcing bar rod into the pile hole, the reinforcing bar rod can be easily inserted.

  It is preferable that the lower end portion of the heat collecting pipe is a folded portion where the heat medium flowing through the heat collecting pipe is folded back, and a sharpened portion is formed in the folded portion.

  As described above, since the sharpened portion is formed in the folded portion where the heat medium flowing through the heat collecting pipe is folded, the heat collecting pipe attached to the reinforcing bar is not attached when the reinforcing bar is inserted into the uncured concrete. Can be easily inserted into hardened concrete.

  Furthermore, the foundation pile according to the present invention is a cast-in-place foundation pile in which a heat collection pipe is arranged inside the cast-in-place foundation pile, and the excavator rod is lowered to bring the excavated soil to the hole wall side. The ground is excavated to form a pile hole while escaping, and after the excavator rod reaches the target depth, the concrete is pressed from the tip of the rod while the excavator rod is pulled up, and the concrete is unhardened in the pile hole. After the excavator rod is pulled out from the pile hole, insert a reinforcing bar with heat collection pipe installed in the pile hole before the uncured concrete hardens, and then harden the concrete. It is characterized by generating foundation piles.

  According to the heat collecting pipe construction method according to the present invention, it is possible to reduce the number of parts while ensuring the filling property of concrete, and to prevent the heat collecting pipe from being damaged due to the lifting work.

It is a side view of the foundation pile constructed | assembled by the heat collection piping construction method which concerns on this embodiment. It is II-II sectional drawing of FIG. It is a top view which shows the example of arrangement | positioning of the foundation pile which concerns on this embodiment. (A) is a top view of the folding | turning part in heat collection piping, (b) is the side view. It is a schematic block diagram of the excavator used for the heat collection piping construction method which concerns on this embodiment. It is a side view of the drill part in a digging apparatus. (A) is process drawing which shows the process of excavating a pile hole by side view, (b) is a process figure which shows the process following (a), (c) is a process figure which shows the process following (b). . (A) is a process diagram showing the process of inserting a reinforcing bar into the foundation pile hole in side view, (b) is a process chart showing a process following (a), and (c) is a process following (b). It is process drawing shown. (A) is a side view of the foundation pile in which defective concrete remains in the upper part of the foundation pile, and (b) is a side view of the foundation pile according to the present embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each embodiment, portions having the same function are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a side view of a foundation pile constructed by a heat collection piping construction method according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. In FIG. 1, for the sake of convenience, the positional relationship between the reinforcing bars and the heat collecting piping is partially omitted. As shown in FIGS. 1 and 2, the foundation pile 1 is provided in the pile hole 2. The foundation pile 1 includes a reinforcing bar 3 and a hardened concrete 4. A heat collecting pipe 5 is attached to the inside of the reinforcing bar 3. In the heat collection piping construction method according to the present embodiment, when the foundation pile 1 is constructed, it is kneaded to the hole wall of the pile hole 2 without discharging excavated soil, and the injection of a stabilizing liquid into the pile hole 2 is not required. The so-called soil-free construction method is used. In the non-exhaust earth method, the excavated soil is not required to be discharged, and the excavated soil is kneaded to the hole wall 2A, so that the strength of the hole wall 2A can be increased.

  The foundation pile 1 according to the present embodiment is a relatively small-diameter pile, and specifically has a diameter of about 620 mm. For this reason, as shown in FIG. 3, with respect to the one footing 10 used as the foundation of a structure, two or more foundation piles 1 here are arrange | positioned. These four foundation piles 1 are distributed and arranged so as to be located at the apexes of a substantially square in plan view. Moreover, in this embodiment, although the full length of the foundation pile 1 is about 28 m, it can also be made longer or shorter than it.

  As shown in FIGS. 1 and 2, the reinforcing bar 3 provided inside the foundation pile 1 is formed in a cylindrical shape by a plurality of reinforcing bars. The reinforcing bar 3 includes a plurality of main bars 31 extending in the height direction. In the present embodiment, as shown in FIG. 2, the reinforcing bar 3 includes eight main bars 31. The plurality of main bars 31 are arranged in a circumferential shape, in this case, in a circular shape in plan view with the reinforcing bar 3 inserted into the pile hole 2. These eight main bars 31 form a substantially cylindrical shape.

  On the outer periphery of the eight main bars 31 having a cylindrical shape, hoop bars 32 formed in a spiral shape of the reinforcing bar 3 are provided. The hoop bar 32 is formed over the entire length of the reinforcing bar 3. The hoop line 32 is fixed to the main line 31 by a wire. Further, the hoop bar 32 can be fixed to the main bar 31 by another fixing method such as welding.

  A plurality of, in this case, seven, strength muscles 33 are provided inside the main muscle 31. The scapular muscles 33 are spaced apart at substantially equal intervals in the height direction. These strength bone muscles 33 are fixed to the main muscle 31 by welding.

  Furthermore, the reinforcing bar 3 is provided with a spacer 34 arranged outside the main bar 31. As shown in FIG. 2, the spacers 34 are arranged at intervals of approximately 90 degrees when viewed in plan view of the reinforcing bar 3. Moreover, the spacer 34 is spaced apart and arrange | positioned in the longitudinal direction of the reinforcing bar 3 as shown in FIG. The distance between the spacers 34 facing each other is substantially the same as the diameter of the pile hole 2. The spacer 34 adjusts the position of the reinforcing bar 3 so that the central axis along the vertical direction of the reinforcing bar 3 coincides with the central axis of the pile hole 2.

  In addition, a plurality of heat collecting pipes 5 are attached to the inside of the sternum 33. The heat collection pipe 5 is made of resin or the like and has flexibility. Further, the heat collecting pipe 5 includes a folded portion 5A where a liquid heat medium flowing through the inside of the heat collecting pipe 5 is folded, and the folded portion 5A is arranged at the lower end position. The heat collecting pipe 5 is attached to the reinforced bone 33 in the reinforcing bar 3 by a binding band or the like, and the longitudinal direction thereof is arranged along the height direction of the reinforcing bar 3. Further, both end portions of the heat collecting pipe 5 are drawn out from the upper end opening of the pile hole 2 toward the outside.

  Furthermore, as shown in FIG. 4, the folded portion 5 </ b> A in the heat collecting pipe 5 is a sharpened portion 5 </ b> B having a sharp tip. The heat collecting pipe 5 allows a heat medium to flow in from one end and discharges the heat medium from the other end. The heat medium flowing through the heat collecting pipe 5 absorbs heat or dissipates heat by circulating through the ground through the heat collecting pipe 5, and between the heat consuming device such as an air conditioner (not shown) on the ground and the ground. Perform heat exchange.

  Moreover, in constructing the heat collecting piping according to the present embodiment, when the foundation pile 1 is constructed, generation of the pile hole 2, construction of the reinforcing bar 3, and placement of concrete 4 are performed. These operations are performed using the truck mixer 6 and the excavator 7 shown in FIG. Here, the structures of the truck mixer 6 and the excavator 7 will be described.

  As shown in FIG. 5, the track mixer 6 includes a drum portion 6A and a chute portion 6B, and the drum portion 6A and the chute portion 6B are provided on the vehicle body 6C. Concrete is loaded on the drum portion 6A. The concrete loaded on the drum unit 6A is discharged toward the rear of the track mixer 6 via the chute unit 6B.

  A concrete pump 8 is installed at the concrete discharge position. One end of a transfer pipe 9 is connected to the concrete pump 8. The other end side of the transport pipe 9 is connected to the excavator 7. The concrete pump 8 pumps the concrete discharged from the truck mixer 6 toward the excavator 7 through the transport pipe 9.

  An arm 71 extending in the vertical direction is attached to the front end portion of the excavator 7. The arm 71 is provided with a slider 72 that is movable up and down along the extending direction of the arm 71. Further, the arm 71 is provided with a wire 73, and a rod 74 that moves in the vertical direction as the slider 72 moves is attached to the slider 72. The rod 74 is attached to the slider 72 so that the longitudinal direction thereof is in the vertical direction, and a wire 73 is attached to the upper end side portion thereof. Thus, the rod 74 is suspended by the wire 73.

  Furthermore, a pressure inlet 74A is provided at the upper end of the rod 74, and the other end of the transport pipe 9 is connected to the pressure inlet 74A. The inside of the rod 74 has a hollow structure, and the concrete pumped from the concrete pump 8 through the transport pipe 9 is transported below the rod 74 through the pressure inlet 74A.

  Further, a drill 75 shown in FIG. 6 is provided at the lower tip of the rod 74. Furthermore, as shown in FIG. 6, a kneading portion 76 is provided at a substantially intermediate portion in the longitudinal direction of the drill 75. The drill 75 includes a drill upper part 75 </ b> A located above the kneading part 76 and a drill lower part 75 </ b> B located below the kneading part 76.

  The drill upper portion 75A is provided with an upper screw 77A whose angle is set so as to convey the excavated soil downward when the drill 75 rotates in a predetermined rotation direction. Further, a lower screw 77B provided with an angle so as to convey the excavated soil upward when the drill 75 rotates in a predetermined rotation direction is provided in the lower drill portion 75B located below the kneading portion 76. It has been. Thus, the installation angles of the upper screw 77A and the lower screw 77B are reversed, and when the drill 75 rotates in a predetermined rotation direction, the excavated soil is conveyed to the kneading unit 76.

  The kneading portion 76 is configured to have the largest diameter in the drill 75. The kneading part 76 is provided with a plurality of grooves extending in the longitudinal direction of the drill 75. Therefore, at the time of excavation by the drill 75, the cut soil is conveyed to the kneading portion 76 by the upper screw 77A and the lower screw 77B, and the kneading portion 76 is configured to press the cut soil against the hole wall 2A of the pile hole 2. .

  A connection joint 78 is provided at the upper end in the longitudinal direction of the drill 75. A connecting joint (not shown) that can be connected to the connecting joint 78 is provided at the lower end of the rod 74. The drill 75 is connected to the lower end portion of the rod 74 by rotationally inserting the connection joint 78 in the drill 75 with respect to the connection joint (not shown) in the rod 74.

  A discharge port 79 is formed at the lower end of the drill 75. The drill 75 is configured as a hollow structure over the entire length in the longitudinal direction, and the concrete fed through the transport pipe 9 is pumped through the rod 74 and discharged from the discharge port 79.

  Next, the procedure of the heat collection pipe construction work using the heat collection pipe construction method according to the present embodiment will be described.

  In the construction of the heat collecting pipe 5 using the foundation pile 1, the excavation work of the pile hole 2 is first performed as shown in FIG. The excavator 7 lowers the rod 74 having a drill 75 attached to the tip thereof while rotating it to excavate the ground. The excavator 7 excavates the pile hole 2 while kneading excavated soil to the hole wall 2 </ b> A by the kneading portion 76 provided in the drill 75. Since the excavated soil during excavation of the pile hole 2 is kneaded to the hole wall 2A, the excavated soil is excavated without being discharged.

  When the pile hole 2 is excavated to the target depth in this way, the rotational driving and lowering of the drill 75 are temporarily stopped. Next, the drill 75 is raised while rotating in the same direction as when it is lowered, and the concrete pump 8 is driven. By driving the concrete pump 8, the concrete is transported to the drill 75 through the transport pipe 9 and the rod 74. The conveyed concrete is press-fitted into the pile hole 2 from the discharge port 79 at the lower end of the drill 75.

  Thereafter, as shown in FIG. 7B, the excavator 7 gradually pulls up the rod 74 while filling the pile hole 2 with concrete. When the rod 74 is pulled up, the excavated soil is kneaded to the hole wall 2A as in the case of forming the pile hole 2. Thereafter, as shown in FIG. 7 (c), the rod 74 continues to rise and the concrete is pressed in until the concrete is filled to the ground surface. The concrete is filled into the pile holes 2 and becomes uncured concrete 4A.

  A certain amount of time is required until the uncured concrete 4A is cured after the filling of the uncured concrete 4A into the pile hole 2 is completed. Here, the reinforcing bar 3 is built in the pile hole 2 before the uncured concrete 4A is cured. When building the reinforcing bar 3, the reinforcing bar 3 is suspended by the crane 11 and the reinforcing bar 3 is inserted into the pile hole 2 as shown in FIG. After the reinforcing bar 3 is inserted into the pile hole 2, the top part protrudes from the pile hole 2, and this top part is fixed to the footing. For this reason, the length of the reinforcing bar 3 is grounded to a length obtained by adding the length fixed to the footing from the depth of the pile hole 2. Further, when the reinforcing bar 3 is not fixed to the footing, the length of the reinforcing bar 3 can be substantially the same as the depth of the pile hole 2.

  Thereafter, the reinforcing bar 3 is gradually lowered while applying vibration to the reinforcing bar 3 by a vibration device (not shown) provided in the crane 11. As shown in FIG. 8 (b), the lowered reinforcing bar 3 is settled in the uncured concrete 4A by its own weight. Here, by applying vibration to the reinforcing bar 3, the reinforcing bar 3 is easily settled against the uncured concrete 4 </ b> A.

  In this way, the settling of the reinforcing bar 3 with respect to the uncured concrete 4A proceeds, and the reinforcing bar 3 reaches the bottom of the pile hole 2, whereby the building of the reinforcing bar 3 is finished. Since the heat collecting pipe 5 is attached to the reinforcing bar 3, when the reinforcing bar 3 is installed, the heat collecting pipe 5 is simultaneously installed in the pile hole 2. When the reinforcing bar 3 reaches the bottom of the pile hole 2, the reinforcing bar 3 is removed from the crane. Thereafter, as a certain time elapses, as shown in FIG. 8C, the uncured concrete 4 </ b> A is solidified to become the hardened concrete 4, and the foundation pile 1 including the heat collecting pipe 5 is constructed.

  When the heat collecting pipe 5 is attached to the reinforcing bar 3, if concrete is placed after the reinforcing bar 3 is installed, a certain distance must be secured between the heat collecting pipe 5 and the reinforcing bar in the reinforcing bar 3. If so, the filling property of the concrete may be reduced. In this regard, in the heat pipe construction method according to the present embodiment, the reinforcing bar 3 is inserted into the uncured concrete 4A. For this reason, even when the heat collection pipe 5 is directly attached to the reinforcing steel frame of the reinforcing bar rod, it is possible to prevent the concrete filling performance from being lowered. Therefore, for example, it is not necessary to arrange a reinforcing bar for supporting the heat collecting pipe inside the reinforcing bar rod, and as a result, it is possible to reduce the number of parts while ensuring the filling property of concrete.

  Moreover, in the heat collection piping construction method according to the present embodiment, when the pile hole 2 is excavated, it is kneaded to the hole wall 2A without discharging the excavated soil, and so-called injection of a stable liquid into the pile hole 2 is unnecessary. The soil-free construction method is used. For this reason, since it can prevent generating the slime which is the cause of producing | generating a defective concrete, the operation | work which picks up the defective concrete produced on a foundation pile upper part becomes unnecessary.

  Below, the effect at the time of making the hanging work of defective concrete unnecessary is further demonstrated. FIG. 9A is a view of the upper end portion of the foundation pile 1 constructed by injecting a stabilizing liquid into the pile hole 2. As shown to Fig.9 (a), in the position which protruded from the ground surface in the upper direction of the foundation pile 1, the slim concrete is included and the inferior concrete 1A which is inferior to the foundation pile 1 and is scraped off by the lifting work is formed. The The defective concrete 1 </ b> A is in a state where the end of the heat collecting pipe 5 is included.

  The suspension work for scraping off the defective concrete 1A is performed by giving a large impact to the defective concrete 1A or using a work machine having a large cutting ability because it is necessary to scrape relatively hard concrete. For this reason, if these work machines etc. accidentally contact the heat collecting pipe 5, the possibility that the heat collecting pipe 5 is damaged or further cut is not low.

  On the other hand, in the heat collection piping construction method according to the present embodiment, since a so-called no-draining method is adopted, as shown in FIG. 9B, a defect as shown in FIG. Concrete 1A will not be formed. For this reason, since it is not necessary to suspend the defective concrete 1A, it is possible to prevent the heat collecting pipe 5 from being damaged due to the suspending operation.

  A hoop bar 32 that is formed in a spiral shape over the entire length of the bar bar 3 is provided on the outer periphery of the bar bar 3. By providing such a hoop bar 32, the reinforcing bar 3 becomes a truss beam shape and durability is improved. For this reason, when inserting the reinforcing bar 3 into the pile hole 2, the reinforcing bar 3 can be easily inserted.

  The heat collecting pipe 5 is attached to a position inside the hoop bar 32 in the reinforcing bar 3. In order to secure the specified cover thickness, as in the case where the heat collection pipe 5 is arranged outside the hoop line 32, the heat collection pipe 5 is arranged inside the hoop line 32. This can be done without increasing the pile diameter.

  Further, the folded portion 5A in the heat collecting pipe 5 is a sharp portion 5B having a sharp tip. Thus, since the front-end | tip of the heat collection piping 5 is made into the sharp part 5B, the reinforcing bar 3 and the heat collection piping 5 can be easily inserted in the unhardened concrete 4A.

  Moreover, in the heat collecting pipe construction method according to the present embodiment, four foundation piles 1 are provided for one footing 10, and the number of foundation piles 1 to be constructed per unit area is increased. For this reason, since the several foundation pile 1 will be crowded, the heat collection effect in the heat collection piping 5 provided in the foundation pile 1 can be improved.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the said embodiment, although the foundation pile 1 is constructed | assembled by the non-exhaust earth method using the drill 75 provided with the kneading part 76, it shall be set as the aspect which construct | assembles the basic pile 1 by another non-exhaust earth method. You can also. Moreover, in the said embodiment, although the reinforcing bar 3 has comprised the cylindrical shape, it can also be set as the aspect which makes a cross-section rectangular shape. Furthermore, in the said embodiment, although the heat collection piping 5 is attached to the sternum muscle 33, it can also be set as the aspect attached to the main muscle 31 or the hoop muscle 32. FIG.

DESCRIPTION OF SYMBOLS 1 ... Foundation pile 1A ... Defective concrete 2 ... Pile hole 2A ... Pile wall 3 ... Reinforcement rod 4 ... Unhardened concrete 5 ... Heat collecting pipe 5A ... Folding part 5B ... Sharp part 6 ... Truck mixer 6A ... Drum part 6B ... Chute part DESCRIPTION OF SYMBOLS 7 ... Excavator 8 ... Concrete pump 9 ... Conveying pipe 10 ... Footing 11 ... Crane 31 ... Main reinforcement 32 ... Hoop muscle 33 ... Fibula muscle 34 ... Spacer 71 ... Arm 72 ... Slider 73 ... Wire 74 ... Rod 74A ... Pressure inlet 75 ... Drill 75A ... Drill upper part 75B ... Drill lower part 76 ... Kneading part 77A ... Upper screw 77B ... Lower screw 78 ... Connection part 79 ... Discharge port.

Claims (6)

A heat collection pipe construction method in which a heat collection pipe is arranged inside a cast-in-place foundation pile,
Lowering the excavator rod, excavating the ground while escaping the excavated soil to the hole wall side to form a pile hole,
After the rod of the excavator reaches the target depth, press the concrete from the tip of the rod while pulling up the rod of the excavator,
The pile hole is filled with concrete in an uncured state, and after the rod of the excavator is pulled out of the pile hole, the heat collection pipe is installed on the pile hole before the uncured concrete is cured. Insert a rebar rod,
Then, the said concrete is hardened and the said foundation pile is produced | generated, The heat collection piping construction method characterized by the above-mentioned.   The heat collection piping construction method according to claim 1, wherein the number of the reinforcing bar rods inserted into the pile hole is one. The reinforcing bar includes a plurality of main bars extending in a height direction, and the plurality of main bars are arranged in a circumferential shape in plan view with the reinforcing bar bar inserted into the pile hole,
Hoop muscles are provided around the plurality of main muscles,
The said heat collection piping is the heat collection piping construction method of Claim 1 or Claim 2 arrange | positioned inside the said hoop line | wire.   The heat collection piping construction method according to claim 3, wherein the hoop muscles are spirally arranged around the plurality of main muscles.   The lower end part of the said heat collection piping is made into the folding | turning part by which the heat medium which distribute | circulates the said heat collection piping turns, The sharpened part is formed in the said folding part. The heat collection piping construction method according to any one of the above items. A cast-in-place foundation pile in which heat collection piping is arranged inside the cast-in-place foundation pile,
Lowering the excavator rod, excavating the ground while escaping the excavated soil to the hole wall side to form a pile hole,
After the rod of the excavator reaches the target depth, press the concrete from the tip of the rod while pulling up the rod of the excavator,
The pile hole is filled with concrete in an uncured state, and after the rod of the excavator is pulled out of the pile hole, the heat collection pipe is installed on the pile hole before the uncured concrete is cured. Insert a rebar rod,
Thereafter, the foundation pile is constructed by curing the concrete and generating the foundation pile.

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