JP2000161793A - Heat source system utilizing geothermy around bank of storage reservoir and constructing of same system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bury a heat exchanger to serve both for the reinforcement of easily collapsible earth part around the bank of a storage reservoir. SOLUTION: The constructing method of a heat source system comprises the digging process of downward holes 14 in easily collapsible earth parts 12 around the bank of a storage reservoir 10, the inserting process of a grout liquid send-out pipe 41 together with a geothermy heat exchanger 21 equipped with an antifreeze circulating passage, a process wherein grout liquid is pumped by a grout liquid pump 42 on the ground to fill a gap between the geothermy heat exchanger 21 as well as the grout liquid send-out pipe 41 and the downward hole 14 while impregnating the grout into the surrounding earth parts 12 and the curing process of the grout liquid in accordance with the elapse of time. The geothermy heat exchanger 21 is buried into the earth parts 12 around the bank of the storage reservoir 10 whereby the collapse of the earth T can be prevented. The grout liquid is impregnated into the surrounding earth T of the geothermy heat exchanger 21 whereby a heat transfer rate is improved compared with the earth individually and the performance of the geothermy heat exchanger 21 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to reinforce a collapsed soil portion around a reservoir embankment and to bury an underground heat exchanger.

[0002]

2. Description of the Related Art A fragile soil portion 1 around a reservoir embankment 1
For reinforcement of No. 2, grout S is permeated into soil T and hardened.

[0003]

As shown in FIG. 1, grout S is made to penetrate into soil T and is superior in strength as compared with a hardened one, so that it can be used as a heat source. Things.

[0004]

[Means for Solving the Problems] Usually, the downstream side of the river is
A dam is formed around the dam and a reservoir 10 is made. Mountain villages have been managing reservoirs, but the number has been large since ancient times, and this is managed in each local settlement. There is no husband in the mowing work twice a year. In recent years, there are few people, mowing does not remain,
Large standing trees are thick and are in an unmanageable condition, such as an old reservoir. The reservoir is at risk of collapse for disaster prevention.

As shown in FIG. 1, as one of means for reinforcing the soil T, a downward hole 14 is dug in the soil T, and the grout liquid delivery pipe 4 is formed.
When the grouting liquid delivery pipe 41 is gradually pulled up while the grouting liquid S is being pumped from the pump 42 on the ground, the grouting liquid S permeates into the underground T and oozes out onto the ground 13. At this time, there is a means for stopping the injection of the grout liquid S and solidifying the grout S over time to reinforce the soil T.

Further, as shown in FIG. 2, a rod-shaped heat exchanger 21 composed of a double pipe or a U-shaped pipe is buried in the underground T, and an antifreeze circulation path 22 of the underground heat exchanger 21 is a primary heat pump 25. In some cases, the liquid circulation path 36 passing through the side 31 and passing through the secondary side 32 of the heat pump 30 passes through the heating / cooling equipment 35. The heat pump 25 includes an evaporator 26, a compressor 27, a condenser 28, and an expansion valve 29. The temperature difference on the primary side 31 is changed to the temperature difference on the secondary side 32, or the temperature difference on the secondary side 32 is changed to the temperature difference on the primary side 31. It changes to a temperature difference. This facility is said to be a means of utilizing geothermal energy.

In the present invention, the portion of the reservoir having the largest amount of water leakage is intended to both reinforce the highly permeable portion of the bedrock on both sides of the embankment and to use the ground heat.

According to the present invention, the reservoir reinforcing means and the underground heat utilization means are combined, the capacity of the reservoir reinforcing means is improved by the underground heat exchanger 21, and the grout S of the reservoir reinforcing means is improved.
Thereby, the heat conductivity around the underground heat exchanger 21 is improved, and the heat collection efficiency is improved.

A description will be given with reference to FIGS. The underground heat utilization heat source system around the reservoir levee body according to the first invention includes an underground heat exchanger 21 and a grout liquid delivery pipe 41 buried in the soil portion 12 around the levee body of the reservoir 10 and the soil portion 12. It consists of infiltrated grout.

[0010] A geothermal heat utilization heat source system around a reservoir according to a second aspect of the present invention is the one according to the first aspect, wherein the grout S contains a heat conductive substance.

According to a third aspect of the present invention, there is provided a method of constructing a heat source system utilizing underground heat around a reservoir embankment, comprising: a step of digging a downward hole 14 in a soil portion 12 around a reservoir 10 embankment; A step of inserting the grouting liquid delivery pipe 41 together with the underground heat pump 21 to feed the grouting liquid S from the ground-based grouting liquid pump 42 to remove the gap between the underground heat exchanger 21 and the grouting liquid delivery pipe 41 and the downward hole 14. Fill and surrounding soil part T
And a step of curing the grout liquid S over time.

According to a fourth aspect of the present invention, there is provided a method of constructing a geothermal heat utilization heat source system around a reservoir embankment according to the third aspect, wherein the grout liquid S is mixed with a heat conductive substance.

[0013]

Embodiments of the present invention will be described with reference to FIGS. 10 is a reservoir, 11 is a bank of the reservoir 10, and 12 is a bank 1.
It is an easily disintegrated soil portion such as near 1.

A downward hole 14 is dug from the ground 13 while the water W in the reservoir 10 is being dropped. The downward hole 14 is dug, and the underground heat exchanger 21 and the grout liquid delivery pipe 41 are successively inserted.

Underground heat exchanger 21 and grout liquid delivery pipe 41
Are provided in an arbitrary number while maintaining an appropriate interval Y.

Underground heat exchanger 21 and grout liquid delivery pipe 4
When 1 reaches a predetermined depth Z (50 to 100 m), the grout liquid S is pumped out from the lower end of the grout liquid delivery pipe 41 by the grout liquid pump 42. The grout liquid S permeates through the soil T and seeps into the ground 13. When this state is reached, the grout liquid pump 42 is stopped, and the grout liquid S is cured with the passage of time.

When the grout S is hardened, the grout S fills the space around the underground heat exchanger 21 and has better thermal conductivity than the soil T. The ground part of the grout liquid delivery pipe 41 is cut off, and the heat pump 25 and the heating / cooling equipment 3
5 is connected.

[0018]

Since the underground heat exchanger 21 is buried in the easily collapsed soil portion 12 around the reservoir 10, the collapse of the soil T can be prevented.

Since the grout S penetrates through the soil T around the underground heat exchanger 21, the heat conductivity is better than that of the soil alone.
The performance of the underground heat exchanger 21 is improved.

[Brief description of the drawings]

FIG. 1 is a partially vertical sectional front view of a conventional bank reinforcing means.

FIG. 2 is a partially vertical sectional front view of a conventional geothermal utilization means.

FIG. 3 is a perspective view showing an outline of the present invention.

FIG. 4 is a partially vertical sectional front view showing a state before grout press-fitting of the present invention.

FIG. 5 is a partially vertical sectional front view showing a state after completion of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Reservoir 11 Embankment 12 Soil part around embankment body 13 Ground 14 Downhole 21 Underground heat exchanger 22 Antifreeze circulation circuit 25 Heat pump 26 Evaporator 27 Compressor 28 Condenser 29 Expansion valve 31 Primary side 32 Secondary side 35 Warm Cooling equipment 36 Liquid circulation path 41 Grout liquid delivery pipe 42 Grout liquid pump S Grout, grout liquid T Soil W Water Y Lateral spacing Z Depth

Claims (4)

[Claims] 1. A soil part (1) around a reservoir (10) embankment body.
An underground heat utilizing heat source system around a reservoir embankment made of an underground heat exchanger (21) and a grout liquid delivery pipe (41) buried in 2), and a grout penetrated into a soil portion (T). 2. The underground heat utilization heat source system around the reservoir embankment according to claim 1, wherein the grout (S) contains a heat conductive substance. 3. A soil portion (1) around a reservoir (10) embankment.
2) a step of digging a downward hole (14), a step of inserting a grout liquid delivery pipe (41) together with a rod heat exchanger (21) with an antifreeze liquid circulation path, and a step of grout liquid (42) from a ground grout liquid pump (42). S) to feed the underground heat exchanger (21) and the gap between the grout liquid delivery pipe (41) and the downward hole (14) and to infiltrate the surrounding soil portion (T),
Curing the grout liquid (S) over time;
A method for constructing a geothermal heat utilization heat source system around a reservoir embankment comprising steps including: 4. The method according to claim 3, wherein a heat transfer material is mixed into the grout liquid (S).