JP2002235957A - Terrestrial heat exchange equipment in landslide dangerous area - Google Patents

Abstract

PROBLEM TO BE SOLVED: To build with the low installation cost a terrestrial heat exchange equipment capable of effectively preventing any damage on a terrestrial heat exchanger even in a dangerous area due to landslide area. SOLUTION: In a dangerous area due to landslide in which a landslide suppression pile 1 is applied, a terrestrial heat exchanger 4 through which a heat medium Lg passes is disposed in the landslide suppression pile 1 such that an earth layer G and the heat medium Lg around the pile are heat exchanged through a constituent member of the landslide suppression pile 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground heat exchanger which is buried underground and exchanges heat with a surrounding formation by passing a heat medium passing through the inside of the heat exchanger. The present invention relates to a geothermal heat exchange facility that radiates heat to a stratum, and particularly to a geothermal heat exchange facility in a landslide-hazardous area.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned geothermal heat exchange equipment,
As shown in FIG. 5, a U-shaped or double-tubular ground heat exchanger is formed in a hole D formed in a target layer G for heat collection or heat radiation in order to install the ground heat exchanger 4 for allowing the heat medium Lg to pass through the vessel. With the vessel 4 inserted, the hole D is filled with cement milk or the like, and the ground heat exchanger 4 is directly buried in the formation G (see, for example, JP-A-11-182942).

[0003]

However, in a landslide-prone area, even if landslides are prevented from being generated by landslide prevention piles or the like, the formation is fragile. There is a high possibility that the geothermal exchanger 4 will be damaged due to the movement of the stratum and the like, and therefore, in a landslide-hazardous area, this type of anti-ground heat exchange equipment has not been used.

[0004] In addition, even in a landslide-hazardous area, in order to use the underground effectively as a heat source and a heat radiator by using this type of ground heat exchange equipment, the ground heat exchanger 4 is robust enough to withstand the movement of the stratum. It is conceivable to bury it in the stratum G as described above, but in this case, it is costly to make the ground heat exchanger 4 robust, and the ground heat exchanger 4 As the size and weight of the device increase, the cost of burying work also increases, which causes a problem that the equipment cost as a whole greatly increases.

[0005] In view of this situation, the main problems of the present invention are:
Another object of the present invention is to make it possible to construct a ground heat exchange facility capable of effectively preventing damage to a ground heat exchanger even at a landslide-hazardous land at a low facility cost.

[0006]

Means for Solving the Problems [1] The invention according to claim 1 relates to a geothermal heat exchange facility in a landslide-hazardous area,
The feature is that in a landslide-hazardous area equipped with landslide prevention piles, a ground heat exchanger that allows a heat medium to pass through the vessel, a layer around the piles and the inside heat medium through the landslide prevention piles through the components of the landslide prevention piles It is located inside the landslide deterrent pile to allow heat exchange.

In other words, according to this configuration, the ground heat exchanger can be prevented from being damaged with a great strength of the landslide prevention pile. Therefore, the ground heat exchanger itself disposed inside the landslide prevention pile is used on a general land. It only needs to have the same strength as a ground heat exchanger, and this makes it possible to construct a ground heat exchange facility that can effectively prevent damage to the ground heat exchanger at low cost even in landslide hazardous areas. it can.

[2] The invention according to claim 2 specifies an embodiment suitable for carrying out the invention according to claim 1, and the feature of the invention is that the ground heat exchanger is connected to the landslide suppression. The point is that it is embedded in the internal filling material of the pile.

In other words, in this configuration, the internal filler of the landslide prevention pile is used as a heat transfer material, and the heat medium passing through the inside of the anti-ground heat exchanger is heat-exchanged with the stratum around the pile, thereby increasing the height. A heat exchange efficiency (that is, a heat collection efficiency and a heat radiation efficiency) is obtained, but a filling form is filled in the pile with the anti-ground heat exchanger arranged inside the landslide prevention pile, that is, the pile is formed in the stratum. In the state where the ground heat exchanger is inserted in the hole and the hole is filled with cement milk etc., the construction is the same as the construction in the general land, so that the installation of the ground heat exchanger can be performed in the general land. It can be performed efficiently and easily as well as installation and construction.
While ensuring high heat exchange efficiency, construction of a ground heat exchange facility in a landslide-hazardous area can be further reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a landslide-hazardous land. In this landslide-hazardous land, as a landslide countermeasure, a landslide prevention pile made of a steel pipe with a pile tip reaching an immovable formation Ga below a landslide surface m. A number of facilities are arranged in rows (so-called steel pipe piles prevent landslides).

On the other hand, FIG. 2 shows a snow melting facility, 2 is a snow melting heat exchanger installed at a snow melting target place such as a road surface, and 3 is an outdoor installation type package heat pump device having a built-in vapor compression heat pump circuit HP. 4, a ground heat exchanger; 5, a load-side circulation path for circulating the load-side heat medium Lr by the load-side pump Pr between the condenser C of the heat pump circuit HP and the snow-melting heat exchanger 2; The heat source side circulation path circulates the geothermal heat medium Lg between the HP evaporator E and the ground heat exchanger 4 by the heat source side pump Pg.

That is, in this snow melting facility, the load side heat medium L
By operating the heat pump circuit HP while circulating r and the geothermal heat medium Lg, the geothermal heat medium Lg is exchanged with the surrounding formation G by the anti-ground heat exchanger 4 to collect heat from the surrounding formation G. Then, the collected heat is heated by the heat pump circuit HP and then applied to the load-side heat medium Lr to be radiated by the heat exchanger 2 for snow melting, thereby melting the snow at the target of snow melting.

5a is a compressor of the heat pump circuit HP, 5a
b is an expansion valve of the heat pump circuit HP. Further, brine is used for the load side heat medium Lr and the geothermal heat medium Lg, respectively.

In this snow melting facility, while the target of the snow melting is in the vicinity of the landslide-hazardous land, the geothermal heat of the landslide-hazardous land is collected by the geothermal heat exchanger 4 and used for snow melting. More specifically, some of the above-mentioned landslide prevention piles 1 are selected, and a ground heat exchanger 4 is arranged inside the selected landslide prevention piles 1 as shown in FIG. Thus, even in a landslide-hazardous area, geothermal heat can be collected in a state in which damage to the geothermal heat exchanger 4 due to movement of the stratum is reliably prevented.

The ground heat exchanger 4 is shown in FIG.
As shown in (b) and FIG. 4, the two U-shaped heat transfer tubes 4a and 4b through which the geothermal heat transfer medium Lg passes, and the cement milk injection tube 4c having an open tube end are integrated in a bundled state. When the ground heat exchanger 4 is installed in the pile of the landslide prevention pile 1, the ground heat exchanger 4 is installed in the vertical hole formed in the stratum in the general ground in the same way as the ground heat exchanger 4 is installed. The cement milk is injected into the pile from the cement milk injection pipe 4c in a state where the anti-ground heat exchanger 4 is inserted and arranged inside the landslide prevention pile 1 placed in the pile.

That is, by injecting the cement milk, the ground heat exchanger 4 is buried in the cement material S inside the landslide prevention pile 1, whereby the cement material S is used as a heat transfer material. , Ground heat exchanger 4
(Ie, inside the U-shaped heat transfer tubes 4a and 4b), the geothermal heat transfer medium Lg is passed through the U-shaped heat transfer tubes 4a and 4b.
4b, a cement layer S as a filler in the pile, and a steel layer wall as a constituent material of the landslide prevention pile 1, a surrounding formation G of the pile 1 (the above-described immovable formation Ga and a moving formation Gb above it).
And heat exchange efficiently.

Reference numeral 4d denotes a weight for facilitating insertion of the ground heat exchanger 4 into the pile.

[Another Embodiment] Next, another embodiment will be described.

In the above-described embodiment, the example in which the ground heat exchanger 4 is disposed inside the steel pipe landslide prevention pile 1 has been described. However, the landslide prevention pile to which the ground heat exchanger is to be mounted is made of steel pipe. It is not limited to piles.For example, landslide prevention made of reinforced concrete formed by forming a hole in the stratum in a landslide-hazardous area and filling the hole with concrete in a state where a reinforcing bar set is provided in the hole Piles (so-called landslide prevention piles made by deep foundation work) are to be installed, and the reinforced concrete landslide prevention piles should be equipped with a geothermal heat exchanger embedded in the concrete material that is the pile component. You may.

In the case where the anti-ground heat exchanger is embedded in the internal filling material of the landslide prevention pile, the filling material in the pile is not limited to a cement material or a concrete material, but may be any material having heat conductivity. Various materials can be adopted.

The specific structure of the anti-ground heat exchanger disposed inside the landslide prevention pile may be any structure, and is not limited to the structure described in the above embodiment.

In the above-described embodiment, the heat collected from the surrounding stratum G of the pile 1 by the ground heat exchanger 4 is used as the heat pump circuit HP
Is used for melting the snow after the temperature is raised. However, in some cases, the heat medium may be directly circulated between the ground heat exchanger 4 and the heat exchanger 2 for melting snow.

The geothermal heat exchange equipment according to the present invention is not limited to the case where the heat medium passing through the vessel is exchanged with the surrounding formation by the ground heat exchanger to collect heat from the surrounding formation. Can be applied to the case where heat is exchanged with the surrounding formation to radiate heat to the surrounding formation. For example, a heat medium is circulated between a condenser and a ground heat exchanger in a heat pump device (refrigerator) for generating cold heat, The heat exhaust heat of the heat pump device is radiated into the ground, or the heat medium is circulated between the cooling heat exchanger located at the cooling target and the ground heat exchanger. It may be cooled.

In the practice of the present invention, when heat is taken from the ground by a ground heat exchanger, the use of the collected heat is not limited to snow melting, but may be any type such as prevention of freezing, heating or heating of articles. In addition, when the heat is radiated into the ground by the ground heat exchanger, the purpose of the heat radiation may be any purpose such as disposal of cooling exhaust heat and cooling of articles.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view showing a landslide danger area.

FIG. 2 is a diagram showing a facility configuration of a snow melting facility;

FIG. 3 is a side cross-sectional view showing an arrangement state of the anti-ground heat exchanger.

FIG. 4 is an enlarged plan view of the ground heat exchanger.

FIG. 5 is a cross-sectional side view showing a conventional heat exchanger arrangement state.

[Explanation of symbols]

 Reference Signs List 1 landslide prevention pile 4 geothermal exchanger G formation Lg heat medium S pile filling material

Claims (2)

[Claims] In a landslide-hazardous area where a landslide prevention pile is installed, a ground heat exchanger that allows a heat medium to pass through the inside of a landslide prevention pile is connected to a formation around the pile and a inside heat transfer medium through a landslide prevention pile. Heat exchange equipment for a landslide-hazardous area, which is disposed inside the landslide prevention pile so as to exchange heat. 2. The ground heat exchanger is embedded in an internal filler of the landslide prevention pile.
Geothermal heat exchange equipment at the landslide hazard area described.