JP2003206528A - Civil engineering-construction pile for constructing ground heat exchange equipment and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently and inexpensively construct ground heat exchange equipment using a civil engineering-construction pile. <P>SOLUTION: Heat transfer pipes 2 for passing a heating medium L are juxtaposed in a plurality in the pile peripheral direction in a state of extending in the pile lengthwise direction on the outer peripheral surface of the pile 1. Belt tools 3 are installed in a state of being wound on the pile 1 in a state of sandwiching the heat transfer pipes 2 between the tools and the outer peripheral surface of the pile 1, and are dispersively arranged in a plurality in the pile lengthwise direction. The heat transfer pipes 2 are installed on the outer peripheral surface of the pile 1 by being fastened by these belt tools 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a civil engineering construction pile for constructing a ground heat exchange facility and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, in constructing a ground heat exchange facility using a civil engineering construction pile such as a foundation pile or an earth retaining pile, after the pile is buried in the ground, the heat transfer pipe is installed from the ground into the hole of the buried pile. Insert into
After that, there was a method of filling the hole with a filler.

This heat transfer tube constitutes a ground heat exchanger, and after the equipment is constructed, the heat medium is allowed to pass through the heat transfer tube to exchange heat with the ground, and the heat transfer tube is taken from the ground. Performs heat or heat radiation to the ground.

[0004]

However, this conventional construction method requires two steps of burying the piles and then inserting the heat transfer tubes into the holes of the buried piles at the construction site of the equipment.
Further, since a large amount of filler is filled in the holes of the buried pile, it takes a long time to fill the holes, which causes a problem that the construction takes a long time and the construction cost increases.

Further, when the heat transfer tube is inserted from the ground into the hole of the pile after being buried at the construction site of the equipment, it is difficult to accurately equip the pile with the heat transfer tube in a state suitable for ground heat exchange. However, there is also a problem in that the heat exchange performance with the ground deteriorates.

In view of this situation, the main problem of the present invention is
The point is to provide a civil engineering construction pile for constructing a rational ground heat exchange facility and a construction method thereof, which can effectively solve the above problems.

[0007]

[1] The invention according to claim 1 relates to a civil engineering construction pile for constructing a ground heat exchange facility, which is characterized in that a heat transfer pipe for passing a heat medium is provided on the outer peripheral surface of the pile. A plurality of strips are arranged side by side in the circumferential direction of the pile in a state of being extended in the longitudinal direction, and the bandages to be attached in a state of being wound around the pile with the heat transfer tube being sandwiched between the pile and the outer peripheral surface of the pile are dispersed in the pile longitudinal direction. The heat transfer tubes are attached to the outer peripheral surface of the pile by fastening with these strips.

That is, according to this structure, since the heat transfer pipes can be preliminarily attached to the outer peripheral surface of the pile in a factory or the like, the pile (the pile to which the heat conduction pipe is preliminarily attached) is buried at the construction site of the equipment. As a result, the heat transfer tube can be installed in the ground simultaneously with the burying.

Further, even if a filler is filled in the gap around the pile in the ground in order to secure high heat transfer to the ground of the heat transfer tube attached to the outer peripheral surface of the pile, the amount of the filler filled in the gap. Compared with the conventional method described above, the required construction time at the equipment construction site can be effectively shortened and the construction cost is also effective compared to the case where the filling material is filled into the pile holes. Can be reduced to

Further, by mounting the heat transfer tube on the outer peripheral surface of the pile in a factory or the like in advance, as compared with inserting the heat transfer tube into the hole of the buried pile at the construction site of the equipment, the heat transfer tube is attached to the pile. Can be easily and accurately mounted in a state suitable for heat exchange with the ground, and as a result, high performance with respect to the heat exchange with the ground can be obtained more reliably than the conventional method described above.

Incidentally, in order to preliminarily mount the heat transfer tube to the pile, it is possible to preliminarily mount the heat transfer tube in the hole of the pile, but in the hole of a long pile having a limited diameter. It is technically difficult to pre-install the heat transfer tube.
With the above structure for attaching the heat transfer tube to the outer peripheral surface of the pile by fastening with the band, it is possible to facilitate the installation work when the heat transfer tube is attached to the pile in advance in a factory,
Also, the manufacturing cost can be reduced.

Moreover, since the heat transfer tube is attached to the outer peripheral surface of the pile, when a plurality of piles are added in the burying of the pile or when the excess ground portion of the pile is cut off,
There is an advantage that it is easy to take appropriate measures for the heat transfer tubes at the pile burying construction site (if the injection tubes are attached to the pile outer peripheral surface together with the heat transfer tubes as described below, the injection tubes are also easily processed). .

In the practice of the invention according to claim 1, a pile having a tip portion having a diameter larger than that of the elongated substantial pile portion is used, and the difference in diameter between the large diameter tip portion and the substantial pile portion is used. The heat transfer tube is attached to the outer peripheral surface of the substantial pile part of the pile in such a form that the heat transfer tube is housed within the range of the pile. It is recommended that piles can be laid smoothly without damaging the heat pipes.

[2] The invention according to claim 2 relates to a method for constructing a civil engineering construction pile according to the invention according to claim 1, which is characterized in that the pile in which the heat transfer pipe is attached to the outer peripheral surface by the strip is This is the point where the filler is put into the clearance around the pile on the surface of the ground as it advances from the ground to the ground, and the filler is filled into the clearance around the pile in the ground.

That is, according to this method, since the filler is put into the clearance around the pile on the surface of the ground as the pile progresses into the ground, the space between the strips distributed in the pile longitudinal direction in the ground. It is possible to reliably fill the gap around the pile (that is, the exposed portion of the heat transfer tube) with the filling material, and to form a filling layer with a small amount of cavity remaining around the pile in the ground. Thereby, the heat transfer performance to the ground of the heat transfer tube attached to the outer peripheral surface of the pile can be secured high, and the heat exchange performance to the ground can be enhanced.

[3] A third aspect of the present invention relates to a method for constructing a civil engineering construction pile according to the first aspect of the present invention, which is characterized in that an injection pipe extending in the longitudinal direction of the pile is provided between the heat transfer pipes in the circumferential direction of the pile. Placed on the outer peripheral surface of the pile together with the heat transfer pipe by the band, and the pile is advanced from the ground to the ground and embedded in the ground, and then the filling material is passed from the ground through the injection pipe. Is injected into the ground and the filling material is filled in the gap around the pile in the ground.

That is, according to this method, after the pile is buried, the filling material is injected into the ground through the injection pipe attached to the outer peripheral surface of the pile and extending in the longitudinal direction of the pile. The space around the pile can be filled in such a manner that the upper surface of the packed bed is gradually raised from the deepest part to the surrounding space, which ensures that the air in the space around the pile is expelled to the ground and the cavity remains. It is possible to form a packed bed with less amount of heat around the pile in the ground, and at this point, it is possible to secure high heat transfer performance to the ground of the heat transfer tube attached to the outer peripheral surface of the pile and improve heat exchange performance to the ground.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 shows a civil engineering construction pile for constructing a ground heat exchange facility for building a ground heat exchange facility while being used as a foundation pile or an earth retaining pile. This pile is a PC pile. The civil engineering construction pile 1 such as the above is used as a main body, and the heat transfer tube 2 is attached to the outer peripheral surface thereof.

The heat transfer tubes 2 are arranged in a row in the pile circumferential direction at appropriate intervals with the straight pipe portions extending in the pile longitudinal direction on the outer peripheral surface of the pile 1, and these straight pipe portions of the pile 1 are arranged. It has a coil structure in which the lower end and the upper end are connected in series by a U-shaped tube.

Reference numeral 3 is a band member attached to the pile 1 in a state of being wound around the pile 1 with the heat transfer tube 2 being sandwiched between the pile member 1 and the outer peripheral surface thereof.
The heat transfer tube 2 is attached to the outer peripheral surface of the pile 1 by fastening with the bandages 3.

Reference numerals 2a and 2b are a heat medium inlet portion and a heat medium outlet portion of the heat transfer tube 2, and these heat medium inlet portions and the heat medium outlet portions 2a and 2b are for connecting pipes after the pile 1 is buried. It is arranged at the upper end of the pile 1.

The heat transfer tube 2 is attached to the outer peripheral surface of the pile 1 by factory production. At the pile burying construction site (that is, the construction site of the ground heat exchanging facility), the heat transfer tube 2 is attached from the factory in advance. As shown in Fig. 2, the piles 1 that have been piled are grounded by an appropriate driving method (for example, rotary driving).
By burying the pile 1, the heat transfer pipe 2 is installed in the underground G at the same time as the pile 1 is buried.

When the pile 1 having the heat transfer tube 2 attached to the outer peripheral surface thereof in advance is buried, as shown in FIG.
While advancing from the ground to the ground G, a funnel-shaped throwing tool 4 or the like is provided with a solidifying filler S (for example, a mixture of cement milk and sand) in a gap around the pile 1 on the ground surface. Gaps around the pile 1 in the underground G (especially, the bandages 3 dispersed in the pile longitudinal direction)
The filler S is filled in the gaps around the piles 1 generated between them to form a solid filling layer around the buried piles 1 for enhancing the heat transfer property of the heat transfer tubes 2 to the ground.

Thereafter, as shown in FIG. 3, the heat medium supply pipe 4a and the heat medium discharge pipe 4b are connected to the heat medium inlet 2a and the heat medium outlet 2b of the heat transfer pipe 2 at the upper end of the buried pile 1. As a result, the heat transfer medium L supplied from the heat transfer medium supply pipe 4a is passed through the heat transfer pipe 2 of the underground G to exchange heat with the ground medium G to collect heat from the ground G, or the ground G Build a ground heat exchange facility that radiates heat to

Reference numeral 1a is an air vent hole for discharging the air trapped in the ground G by charging the filler S to the ground through the hole 1b of the pile 1.

In the first embodiment and the second embodiment described later, the tip 1c of the pile 1 has a diameter larger than that of the long substantial pile portion, and the large diameter tip 1c and the substantial pile portion are The heat transfer tube 2 is attached to the outer peripheral surface of the substantial pile portion of the pile 1 in such a form that the heat transfer tube 2 is housed within the range of the difference in diameter, and thereby the heat transfer tube 2 on the outer peripheral surface of the pile is not hindered. Further, the pile 1 can be smoothly placed in the construction while preventing the heat transfer tube 2 on the outer peripheral surface of the pile from being damaged.

[Second Embodiment] FIG. 4 shows a pile improved from the civil engineering construction pile for constructing a ground heat exchange facility shown in the first embodiment. In this pile, from the upper end of the pile 1 A plurality of injection pipes 5 extending in the pile longitudinal direction across the lower end are dispersed in the pile circumferential direction in a form of being arranged between the heat transfer pipes 2, and the injection pipes 5 are arranged together with the heat transfer pipes 2 by the band 3 on the outer periphery of the pile 1. It is attached to the surface.

Similar to the first embodiment, the heat transfer pipe 2 and the injection pipe 5 are attached to the outer peripheral surface of the pile 1 by factory manufacturing, and the pile burying construction site (ground heat exchange equipment construction site).
Then, the pile 1 shipped from the factory with the heat transfer pipe 2 and the injection pipe 5 attached in advance is buried in the underground G as shown in FIG. The heat pipe 2 and the injection pipe 5 are installed in the underground G.

Then, after the pile 1 having the heat transfer tube 2 and the injection tube 5 preliminarily attached to the outer peripheral surface is advanced from the ground to the ground G and buried, the solidification property is applied from the ground through the injection tube 5 as shown in FIG. By injecting the filler S into the ground G, the filler S is gradually raised from the deepest portion to the gap around the pile 1 in the ground G (that is, As a result, air in the gap around the pile 1 is expelled to the ground) to form a solid filling layer around the buried pile 1 for enhancing the heat transfer performance of the heat transfer tube 2 to the ground.

After that, as in the first embodiment, the heat medium supply pipe 4a and the heat medium discharge pipe 4b are connected to the heat medium inlet 2a and the heat medium outlet 2b of the heat transfer pipe 2 at the upper end of the buried pile 1.
By connecting the above, the heat transfer medium L supplied from the heat transfer medium supply pipe 4a is exchanged with the ground to collect heat from the ground G, or the heat transfer facility to radiate heat to the ground G is constructed.

[Other Embodiments] Next, other embodiments will be listed.

The pile 1 for mounting the heat transfer tube 2 on the outer peripheral surface is P
The pile is not limited to the C pile, but may be a pile made of any material such as a steel pile, and the cross-sectional shape thereof is not limited to a circular shape and may be a rectangle or an ellipse.

In the above-described embodiment, the pile 1 having a pointed tip is used.
However, in addition to the tip shape of the pile 1, the pile 1 may have any shape such as a large-diameter cylindrical shape in which the hole 1b of the pile 1 opens at the tip.

The application of the pile 1 as a civil engineering construction pile may be any application as long as it is a civil engineering construction application, such as foundations and earth retaining of various buildings.

A plurality of heat transfer tubes 2 arranged side by side in the pile circumferential direction in the state of being extended in the pile longitudinal direction on the outer peripheral surface of the pile 1 are
As in the above-described embodiment, the heating medium supply pipe 4a and the heating medium discharge pipe 4b are connected in series in a state where they are connected in series, or the heating medium supply pipe 4a and the heating medium discharge pipe 4b are connected in parallel. Any of the forms may be adopted.

The heat transfer tube 2 may be a tube made of any material such as a metal tube, a resin tube, a concrete tube.

The heat transfer tube 2 is attached to the pile 1 so that the heat transfer tube 2 is sandwiched between the heat transfer tube 2 and the outer peripheral surface of the pile 1 and is wound around the pile 1.
Various shapes and structures can be adopted for the bandage 3 fixed to.

The filling material S to be filled in the gap around the pile 1 in the ground G is not limited to cement milk, but may be any one as long as it can enhance the heat transfer property to the ground of the heat transfer tube 2 attached to the outer peripheral surface of the pile 1. Various materials can be adopted.

Further, when burying the civil engineering construction pile of the invention according to claim 1, the method for injecting and filling the filler S is not limited to the injection and filling method adopted in the invention according to claim 2 or 3, and various injection methods are possible. A filling method can be adopted, and for example, the filling material S is buried in the vertical shaft into which the filling material S has been previously injected by inserting the pile 1 into the shaft, and then the filling material S is piled in the underground G.
The filling material S is spread over the surrounding gaps or through the hole 1b of the pile 1 and the tip opening of the pile 1 after the pile 1 is buried.
A method of injecting and filling

When the injection pipe 5 extending in the longitudinal direction of the pile is attached to the outer peripheral surface of the pile 1 together with the heat transfer pipe 2, the number of the injection pipes 5 to be attached is not limited to a plurality, and in some cases, one pipe may be attached. Only the injection pipe 5 may be attached to the outer peripheral surface of the pile 1 together with the plurality of heat transfer pipes 3.

The heat medium L which is passed through the heat transfer tube 2 attached to the outer circumference of the pile 1 is circulated between the heat transfer tube 2 and the evaporator (heat absorber) or condenser (heat radiator) of the heat pump.
Alternatively, any use form may be adopted, such as a form in which the heat transfer pipe 2 is circulated between a heat radiating pipe installed on a road surface or the like for snow melting and frost prevention.

When heat is collected from the underground G in the heat transfer tube 2 attached to the outer periphery of the pile 1, the use of the collected heat may be any one of snow melting, freeze prevention, heating, article heating, etc. On the contrary, when heat is radiated to the underground G in the heat transfer tube 2 attached to the outer periphery of the pile 1, the purpose of the heat radiation is to dissipate cooling exhaust heat, article cooling exhaust heat, equipment generated heat, etc. It may be heat dissipation for various purposes.

[Brief description of drawings]

FIG. 1 is a perspective view and a cross-sectional view showing a structure of a pile according to a first embodiment.

FIG. 2 is a side view showing a burying construction form of a pile in the first embodiment.

FIG. 3 is a side view showing the configuration of the ground heat exchange facility in the first embodiment.

FIG. 4 is a perspective view and a cross-sectional view showing the structure of the pile according to the second embodiment.

FIG. 5 is a side view showing a burying construction form of a pile in the second embodiment.

[Explanation of symbols]

1 pile 2 heat transfer tubes 3 obi 5 injection tubes G underground L heat medium S filler

Claims (3)

[Claims] 1. A plurality of heat transfer tubes for passing a heat medium are arranged side by side in the pile circumferential direction in a state of extending in the pile longitudinal direction on the outer peripheral surface of the pile, and the heat transfer tube is sandwiched between the heat transfer tube and the outer peripheral surface of the pile. In this state, a plurality of strips to be attached in a state of being wound around the pile are dispersed in the longitudinal direction of the pile, and the heat transfer tubes are attached to the outer peripheral surface of the pile by fastening with these strips. Civil engineering construction pile. 2. The method for constructing a civil engineering construction pile according to claim 1, wherein the pile in which the heat transfer pipe is attached to the outer peripheral surface by the band is advanced from the ground to the ground, A method for constructing a civil engineering construction pile in which a filler is put into a gap around a pile and the filler is filled into a gap around the pile in the ground. 3. The method for constructing a civil engineering construction pile according to claim 1, wherein an injection pipe extending in a pile longitudinal direction is arranged between the heat transfer pipes in a pile circumferential direction, and the heat transfer pipe is provided by the band. Attached to the outer peripheral surface of the pile together with, after advancing this pile from the ground to the ground and burying it in the ground,
A method for constructing a civil engineering construction pile, comprising injecting a filling material into the ground from the ground through the filling pipe, and filling the filling material into a gap around the pile in the ground.