JP2012077579A - Installation method of underground heat exchange tube, and reinforcement cage for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent cross sectional breakage in the conventional installation method of an underground heat exchange tube and further to solve the problem that breakage of the underground heat exchange tube is likely to occur when a reinforcement cage is inserted into a hole.SOLUTION: A rod-like or band plate-like pipeline supporting member, in which at least one of both ends in the lengthwise direction is bent in an L-shape, is fixed to a reinforcement ring for holding main reinforcements in a reinforcement cage for a foundation pile, and heat exchange tubes are disposed while vertically inserted inside one side part bent in an L-shape in the pipeline supporting member. The reinforcement cage is inserted into an excavated hole and further concrete is placed to install the underground heat exchange tubes.

Description

  The present invention relates to a method for installing an underground heat exchange tube using a foundation pile of a building, and a reinforcing bar rod used therefor.

  Conventionally, the heat pump system using geothermal heat is a system that dissipates and collects heat from underground heat exchange tubes buried in the ground, and does not release air-conditioning exhaust heat to the atmosphere, so it is effective as a countermeasure for urban heat islands. It is a means. As a method of burying the underground heat exchange tube in the underground heat exchange system, for example, there is a borehole method in which a hole is formed in the ground, a heat exchange pipe is inserted, and the hole is filled. Since this method increases the excavation cost, the foundation pile of the building is used for the purpose of reducing excavation cost, improving work efficiency, and improving the heat exchange rate. It is known that a U-shaped pipe is attached and installed along the axial direction on the outer periphery of a reinforcing bar (see Patent Document 1).

JP 2004-332330 A

  However, in the conventional method of installing the underground heat exchange tube, the heat exchange tube is tied to the reinforcing bar spacer with a wire to support it. The work with the equipment supplier who installs the exchange tube crosses, and the construction of the pile takes time. In addition, when a heat exchange tube is piped inside the pile, it becomes a cross-sectional defect of the pile, so that it is necessary to increase the pile diameter or increase the strength of the concrete, resulting in an increase in cost. As in the above-mentioned Patent Document 1, in the installation method using the foundation pile, since the heat exchange tube is exposed, the heat exchange tube collides with the hole wall when the reinforcing bar is inserted into the excavated hole. May cause water leakage. In addition, since the area below 10 m from the ground fluctuates due to the influence of outside air temperature, solar radiation, snow cover, etc., the heat exchange rate deteriorates. The installation method of the underground heat exchange tube according to the present invention has been proposed in order to solve such a problem.

  The gist for solving the above-mentioned problems of the installation method of the underground heat exchange tube according to the present invention is to provide a reinforcing ring for holding a main bar in a reinforcing bar for a foundation pile, of both longitudinal ends. At least one side portion is fixed to a bar-shaped or strip-shaped pipe support material bent into an L shape, and the heat exchange tube is inserted vertically inside the one side portion of the pipe support member bent into the L shape. It is to place the concrete bar into the hole that has been disposed and excavated, and to place concrete further.

A through hole for inserting a string member for fixing the position of the heat exchange tube is formed in one side portion bent in the L shape, or a locking portion for locking the string member is provided. ,;
The heat exchange tube is connected in a U shape at the lowermost position of the reinforcing bar inserted in the hole, and the two heat exchange tubes connected in the U shape are fixed to one pipe support member. That;
Furthermore, in one side portion bent in the L-shape, a rod-like or strip-like projection member having a size equal to or larger than the diameter of the heat exchange tube is fixed to the tip portion toward the inside;
Further, while inserting the reinforcing bar rod into the hole, the heat exchanging tube is fed out from a plurality of tube feeding devices arranged around the hole and inserted into the inside of the pipe support member to fix the position. And sequentially fixing the position of the heat exchange tubes to a plurality of circumferentially disposed pipe support members provided at appropriate intervals in the vertical direction;
The U-shaped heat exchange tubes for each of the pipe support members disposed at a plurality of locations at intervals in the circumferential direction of the reinforcing bar rod are independently piped to the heat exchange device, Alternatively, at the upper position in the vertical direction of the reinforcing bar, the U-shaped heat exchange tubes are continuously connected by the connecting pipes arranged in the circumferential direction, and two tubes are extended to the heat exchange apparatus. Being plumbed;
Is included.

The gist for achieving the object by solving the above-mentioned problems of the underground heat exchange tube according to the present invention is as follows:
At the reinforcement ring for holding the main reinforcement in the reinforcing bar for the foundation pile, a rod-like or strip-like pipe support material in which at least one side portion is bent in an L shape is fixed to both ends in the longitudinal direction, and the pipe support member The heat exchange tube is disposed by being vertically inserted inside one side portion bent in the L shape.

Further, in one side portion bent in an L shape, a rod-like or strip-like projection member having a size equal to or larger than the diameter of the heat exchange tube is fixed to the tip portion toward the inside;
The heat exchange tube is thermally insulated by a heat insulating member covered by the heat exchange tube in a range of 10 m or less from the ground surface in a state of being embedded in the hole;
The pipe support member is L-shaped or U-shaped in a side view;
Is included.

According to the installation method of the underground heat exchange tube and the reinforcing bar rod for the underground heat exchange tube of the present invention, the piping support member is provided on the reinforcing ring of the reinforcing rod rod, so that the cost can be reduced and the piping work efficiency is improved. Can be made. Further, when the heat exchange tube is added, the heat exchange tube can be added at an arbitrary position in the circumferential direction of the reinforcing ring. In addition, the installation position of the heat exchange tube can be set to an arbitrary position, so that the loop pipe's forward and return pipes can be pulled out in the pit direction even in a work environment such as a narrow site or a place in contact with the adjacent site. Can be increased.
The heat exchange tube is arranged outside the pile main body, does not become a cross-sectional defect of the pile, and does not affect the structural strength.
Moreover, since a heat exchange tube is installed in the outer peripheral part of a foundation pile, heat exchange is performed efficiently. Further, when the reinforcing bar rod is inserted into the hole, the heat exchange tube is inside the pipe support member and is protected, so that the tube is not damaged.
By heat insulating the heat exchange tube within a range of 10 m or less from the ground surface, the heat exchange rate can be improved.
By making the piping support member L-shaped and shortening the length in the radial direction, the diameter of the hole can be reduced, the amount of concrete in the fracturing portion can be reduced, and the construction period can be shortened and the cost can be reduced. In this way, a number of excellent effects are exhibited.

It is a partial top view (A) and (B) of the state which fixed the piping support members 2 and 2a to the reinforcing bar 1 concerning the installation method of the underground heat exchange tube which concerns on this invention. It is a perspective view (A) which shows a part of reinforcing bar rod 1 concerning the invention concerning the present invention, and a partial perspective view (B) of the state where the reinforcing rod rod 1 was turned sideways In the reinforcing bar rod 1 of the present invention, a front view (A), a side view (B), and a cross-sectional view along the line BB (C) showing how the underground heat exchange tube 3 is fixed to the pipe support member 2. ), A perspective view (D), and a sectional view (E) along the line AA. In the reinforcing bar 1 according to the present invention, a plan view (A) when the heat exchange tubes 3 are arranged at four locations in the circumferential direction of the reinforcing ring 4, and a plan view (B) when arranged at six locations. It is. It is sectional drawing which shows a mode that the heat exchange tube 3 is pulled out from the unreinforced part 17a of foundation concrete in the state which insertion of the reinforcing bar 1 was completed. It is a perspective view (A) and (B) which show the connection state of heat exchange tube 3 in pile head 16a. It is a top view (A) and (B) which shows the outgoing tube 3b of the heat exchange tube 3, and the drawing-out method of the ring tube 3c. It is a top view (A), (B), (C) which shows a mode that a cross-sectional defect is not produced with the number of pairs by the connection method of the same heat exchange tube 3. FIG. FIG. 6 is a cross-sectional view of the third embodiment of the present invention when the heat exchange tube 3 is insulated.

  As shown in FIGS. 1-A to 1-B, the underground heat exchange tube according to the present invention is installed on a reinforcing ring 4 in a reinforcing bar so that the pipe support member 2 is fixed inside the pipe support member. An underground heat exchange (hereinafter simply referred to as heat exchange) tube 3 is piped, and the reinforcing bar is inserted into a hole to place concrete.

  The reinforcing bar 1 of the invention according to the present invention will be described. As shown in FIG. 1-A to FIG. 1-B, the reinforcing bar 4 for holding the main reinforcing bar 5 in the reinforcing bar 1 for the foundation pile has a L-shaped at least one side of both ends in the longitudinal direction. The bent rod-like or strip-like pipe support members 2, 2a are fixed by welding means or the like. Reference numeral 6 in the figure denotes a hoop line.

  The pipe support members 2 and 2a are, for example, U-shaped and L-shaped lower strip steel, and for example, the pile diameter 7 is 1300 mmφ, the length of the pipe support member 2 is 200 mm, the width is 90 mm, and the height is It is about 13.5 mm and the plate thickness is about 8 mm.

  Further, the pipe support member 2 has a rod-like or strip-like projection member 9 having a dimension equal to or larger than the diameter of the heat exchange tube 3 facing inward at one side portion 2b bent in an L shape. It is fixed to the tip 2c. The protruding member 9 protects the heat exchange tube 3 from moving outside.

  A heat exchange tube 3 is disposed in the pipe support members 2 and 2a so as to be inserted in the vertical direction inside the one side portion 2b bent in the L shape. The heat exchange tube 3 is, for example, a polyethylene tube, and as an example, is a tube made of synthetic resin of about 25 to 30 mm.

  As shown in FIG. 3A, the pipe support members 2 and 2a are provided at four places in the circumferential direction of the reinforcing ring 4 in the reinforcing bar rod 1, and the heat exchange tube 3 is not piped at the remaining one place. Used as a spacer. In addition, the code | symbol 10 has shown the adjacent land boundary line. In addition, as shown in FIG. The reinforcing ring 4 is arranged at an interval of, for example, about 3 m in the vertical direction of the reinforcing bar 1.

  In the pipe support member 2, as shown in FIG. 2A, a through hole 2 d for inserting a string member 11 for fixing the position of the heat exchange tube 3 is formed in one side portion 2 b bent in an L shape. It is installed. The string member 11 is, for example, a synthetic resin binding band. Moreover, not only the said through-hole 2d but the string member 11 should just be locked, Therefore Locking parts, such as a recessed part or a convex part, may be sufficient.

The U-shaped portion of the heat exchange tube 3 is difficult to bend the polyethylene tube itself due to the rigidity of the tube, so a U-shaped joint 12 made of synthetic resin is used. The ends of the heat exchange tube 3 are tightly connected to the two outlets of the U-shaped joint 12, respectively. The U-shaped joint 12 is fixed to the pipe support members 2 and 2a fixed to the reinforcing ring 4 at the lower end portion of the reinforcing bar 1 with bolts 13 and nuts 13a. In this way, as shown in FIGS. 2 to 3, the heat exchange tube 3 is connected in a U-shape at the lowermost position of the reinforcing bar 1 inserted in the hole 15, and one pipe support member 2. The two heat exchange tubes 3 connected in the U-shape are fixed to each other.

  The construction for inserting the reinforcing bar 1 according to the present invention into the hole 15 excavated in the ground as described above will be described. As shown in FIGS. 1-A (A), (B) and FIG. 1-B (B), the reinforcing bar 1 is connected to the reinforcing ring 4 from the distal end side to be inserted into the ground, to the pipe support member 2 or the pipe. The support member 2a is fixed by welding.

  Further, as shown in FIGS. 2 (A) and 2 (B), a U-shaped joint 12 is connected to the ends of the heat exchange tubes 3 and 3 at the distal end of the reinforcing bar 1, It fixes to the reinforcement ring 4 of the most advanced part (the lowest part in the ground) with the bolt 13 and the nut 13a. Further, the heat exchange tube 3 is fixed inside the one side portion 2b of the pipe support member 2 with a binding band 11 or the like at a position immediately above the U-shaped joint 12. A protective tape 14 or the like is wrapped around the binding band 11 and fixed to the one side portion 2b so as not to be cut or damaged by colliding with the hole wall 8 or the like (FIG. 1-B (A )reference).

  The heat exchange tubes 3 are prepared in pairs at 4 to 8 locations, and the heat exchange tubes 3 wound in a ring shape are inserted and hung through a drum or a simple portal frame, As the tube feeding device, the feeding device is prepared in the vicinity of the periphery of the hole 15 on the ground. Thus, the heat exchange tube 3 is fed out from a drum or the like while the rebar rod 1 is inserted into the hole 15. And the said reinforcing rod 1 is lifted with a crane, and as shown to FIG. 1- (A), it inserts into the hole 15 from a front-end | tip part.

  When the pipe support members 2 and 2a around the reinforcing ring 4 fixed at intervals of about 3 m in the vertical direction by inserting the reinforcing bar 1 into the hole 15 reach the working position height of the operator, a pair of heat exchange tubes 3 and 3 are fixed to the reinforcing ring 4 with a binding band 11. The insertion operation of the reinforcing bar 1 and the mounting operation of the heat exchange tube 3 are sequentially repeated, and the insertion of the reinforcing bar 1 into the hole 15 is completed, as shown in FIG. .

  In this way, while inserting the reinforcing bar 1 into the hole 15, the heat exchange tubes 3 are fed out from a plurality of tube feeding devices disposed around the ground of the hole 15 and inserted inside the pipe support members 2. The positions of the heat exchange tubes 3 are sequentially fixed to the pipe support member 2. In addition, when the hole 15 is a deep hole of several tens of meters, the rebar rods 1 having the required length are successively connected and inserted by welding means one after another. In addition, a necessary heat exchange tube 3 may be fixed to the reinforcing bar 1 in advance, and the heat exchanging tube 3 may be connected with a connecting jig or the like each time the reinforcing bar 1 is connected. If it does in this way, the heat exchange tube 3 can be previously assembled | attached to the reinforcing bar 1 at the site of a factory or a field, and insertion work efficiency will improve.

  As shown to FIG. 5 (A), (B), in the pile head 16a of the foundation pile 16, the upper end part of the said heat exchange tube 3 is connected with the ring shape by the loop piping 3a. The loop pipe 3 a is constructed at the bottomless portion 17 a at the lower end of the foundation concrete 17. Then, an outgoing pipe 3b and an annular pipe 3c that are drawn out to the heat exchanger are provided. As shown in FIG. 6, the outgoing pipe 3b and the ring pipe 3c are arranged in the underground pit direction. This is because the loop work of the loop pipe 3a is a work at the bottom of the root, and the efficiency of the electric fusion work of the loop pipe on the adjacent land boundary side is improved.

  In addition, as shown in FIG. 7A, the loop pipe 3a has a straight pipe for connecting the adjacent heat exchange tubes 3 when the number of the pair of heat exchange tubes 3 is small (for example, four pairs or six pairs). If it connects with (pipe 3a pulled out with the dashed-dotted line in FIG. 7 (A), (B)), it will become a cross-sectional defect | deletion of the foundation pile 16. FIG. Therefore, for example, if the pile diameter 7 is 1300 [phi] mm, it is connected by the loop pipe 3a with R having a bending diameter of about 1400 [phi] mm (see FIGS. 7A and 7B).

  Thereby, the heat exchange tubes 3 can be connected to each other outside the effective cross-sectional area of the pile. Therefore, there is no possibility that a cross-sectional defect will occur in the pile. In this way, the rebar rod 1 is inserted into the hole 15 and the heat exchange tube 3 is disposed inside the pipe support member 2, so that it is safely protected and embedded.

  As another example of the rebar rod 1 according to the present invention, with respect to the heat exchange tube 3, U-shaped heat exchange for each of the pipe support members 2 arranged at a plurality of positions at intervals in the circumferential direction of the rebar rod 1. It is that the tubes 3 and 3 are independently piped to the heat exchange device. According to this, for example, when the heat exchange tube 3 in one place is damaged in the ground 15a and cannot be used due to liquid leakage, do not use the heat exchange tube 3 in only one place. If closed, the other heat exchange tubes 3 are not affected in any way.

  On the other hand, as in the first embodiment, each U-shaped heat exchange tube 3 is connected by a connecting pipe (loop piping 3a) disposed in the circumferential direction at the upper position in the vertical direction of the reinforcing bar 1. If the tube 3 is continuous and the two tubes 3b and 3c are extended to the outside and piped to the heat exchange device, if one place is damaged and a liquid leaks, the damaged place is specified. This is difficult and the drawback is that the entire heat exchanger cannot be used.

  As shown in FIG. 8, the heat exchange tube 3 is insulated by a heat insulating member in a range of 10 m or less from the ground surface 15 b in a state of being embedded in the hole 15. This is because the underground temperature of about 10 m or more from the ground surface 15b is stable throughout the year, and heat exchange is performed in the underground range where the temperature is stable. The heat exchange rate is increased by keeping the heat exchange tube 3 shallower than 10 m warm.

  The installation method of the underground heat exchange tube according to the present invention and the reinforcing bar used for it are heat exchange devices that use underground heat, and can be applied to piles that use the reinforcing bar for holes.

1 Rebar rod,
2 piping support member, 2a piping support member,
2b one side, 2c tip,
2d through hole,
3 heat exchange tube, 3a loop piping,
3b Outlet tube, 3c Ring tube,
4 Reinforcement ring,
5 main muscles,
6 Hoop muscle,
7 Pile diameter,
8 perforated walls,
9 Protruding member,
10 Adjacent border line,
11 String members,
12 U-shaped joint, 12a Mounting hole,
13 bolts, 13a nuts,
14 Protective tape,
15 holes, 15a ground,
15b Ground surface,
16 foundation pile, 16a pile head,
17 Foundation concrete, 17a Unstriped part.

Claims (10)

At the reinforcement ring for holding the main reinforcement in the reinforcing bar for the foundation pile, a rod-like or strip-like pipe support material in which at least one side portion is bent in an L shape is fixed to both ends in the longitudinal direction, and the pipe support member Inserting a heat exchanging tube in the up and down direction inside one side part bent in the L shape, inserting the rebar rod into the excavated hole, and placing concrete further;
The installation method of the underground heat exchange tube characterized by this. A through hole for inserting a string member for fixing the position of the heat exchange tube is formed in one side portion bent in an L shape, or a locking part for locking the string member is provided,
The installation method of the underground heat exchange tube of Claim 1 characterized by these. The heat exchange tube is connected in a U shape at the lowest end position of the reinforcing bar rod inserted in the hole, and the two heat exchange tubes connected in the U shape are fixed to one pipe support member. Being
The installation method of the underground heat exchange tube in any one of Claim 1 thru | or 2 characterized by these. On one side bent into an L-shape, a rod-like or strip-like projection member having a size equal to or larger than the diameter of the heat exchange tube is fixed to the tip portion toward the inside,
The installation method of the underground heat exchange tube in any one of Claims 1 thru | or 3 characterized by these. While inserting the reinforcing bar rod into the hole, the heat exchange tubes are drawn out from a plurality of tube feeding devices arranged around the hole above and inserted into the inside of the pipe support member to fix the position, and the reinforcing bar rod is lowered. The position of the heat exchange tubes is sequentially fixed to a plurality of pipe support members arranged in the circumferential direction provided at appropriate intervals in the vertical direction.
The installation method of the underground heat exchange tube in any one of Claims 1 thru | or 4 characterized by these. The heat exchange tubes are piped to the heat exchange device independently of the U-shaped heat exchange tubes for each of the pipe support members arranged at a plurality of positions at intervals in the circumferential direction of the reinforcing bar, or The U-shaped heat exchange tubes are continuously connected by connecting pipes arranged in the circumferential direction at the upper position in the vertical direction of the reinforcing rods, and two tubes are extended to the outside to be piped to the heat exchange device. is being done,
The installation method of the underground heat exchange tube in any one of Claims 1 thru | or 5 characterized by these. At the reinforcement ring for holding the main reinforcement in the reinforcing bar for the foundation pile, a rod-like or strip-like pipe support material in which at least one side portion is bent in an L shape is fixed to both ends in the longitudinal direction, and the pipe support member The heat exchange tube is disposed by being vertically inserted inside one side portion bent into the L shape,
Reinforcing rod for underground heat exchange tubes. On one side bent into an L-shape, a rod-like or strip-like projection member having a size equal to or larger than the diameter of the heat exchange tube is fixed to the tip portion toward the inside,
The reinforcing bar rod for underground heat exchange tubes according to claim 7 characterized by these. The heat exchange tube is insulated by a heat insulating member covered with the heat exchange tube in a range of 10 m or less from the ground surface in a state of being embedded in the hole,
The reinforcing bar rod for underground heat exchange tubes according to any one of claims 7 to 8. The pipe support member is L-shaped or U-shaped in a side view,
The reinforcing bar rod for underground heat exchange tubes according to claim 7 or 9.

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