JP2017096095A - Method for burying heat exchange pipe for underground heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to bury a heat exchange pipe by efficiently lowering the heat exchange pipe even when an obstacle such as a lump of mud exists in a pile hole.SOLUTION: A method for burying a heat exchange pipe for underground heat includes: excavating a pile hole 42 from the ground 41 to bury a concrete precast pile 43 having a hollow 44 into the pile hole 42 (a); inserting a heat exchange pipe 1 with the lower end to which a weight member 20 and propulsion device 10 are attached into the hollow 44 of the precast pile 43 (b), (c); when an obstacle such as a lump of mud exists in the course of its descent, supplying high-pressure water from the ground 41 to a supply pipe 13 to inject high-pressure water upwards from injection ports 12, 12 of the propulsion device 10 (d) before descending to the bottom of the precast pile 43 (e); and stopping the propulsion device 10's injection before drawing up only the propulsion device 10 to the ground 41 while holding the heat exchange pipe 1 on the ground 41 (f).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for burying a heat exchange pipe for underground heat used when exchanging heat between a relatively high temperature in the ground and a relatively low heat on the ground, and a propulsion tool for burial used in this burying method About.

  Conventionally, a large number of heat exchange pipes bent in a U shape are embedded in a pile hole, and heat is taken out from a relatively high temperature underground through various heat exchange media such as water. In this case, the lower end portion of the heat exchange pipe (that is, the U-shaped folded portion) is fixed to the outer periphery or the hollow portion of the hollow ready-made pile, and the heat exchange pipe is embedded in the pile hole together with the already-made pile. (Patent Document 1).

JP2012-57824

When attaching to the ready-made pile and embedding with the ready-made pile, it is necessary to stop the heat exchange pipe with the ready-made pile embedding jig etc. on the inner wall or outer wall of the ready-made pile, When burying the heat exchange pipe to a deep position connected to the upper pile, it is necessary to join the lower pile while rotating the upper pile, and the work becomes complicated in conjunction with the installation of the heat exchange pipe to the upper pile There was a problem.
In addition, when the heat exchange pipe is buried directly in the pile hole (or in the hollow part of the ready-made pile) without fixing the heat exchange pipe to the ready-made pile, if there is mud in the pile hole, In some cases, the heat exchange pipe could not be embedded easily. In addition, it was more difficult to empty the pile hole so as not to generate mud.

  So, in this invention, the propeller is attached to the lower end of the heat exchange pipe, the heat exchange pipe is embeded in the pile hole alone, and even if there is a mud in the pile hole, the high pressure fluid is jetted upward from the propeller, The problem was solved.

That is, the present invention is a method for burying a heat exchange pipe for underground heat, which is characterized as follows.
(1) Excavate from the ground to form a pile hole of a predetermined shape, inject cement milk into the pile hole, and if necessary, embed a hollow ready-made pile in the pile hole.
(2) On the ground, a propulsion tool is attached to the lower end of the reciprocating pipe for heat exchange, and the reciprocating pipe for heat exchange and the propulsion tool are inserted into the pile hole or the hollow portion of the ready-made pile in the pile hole. And descend.
(3) Supplying high-pressure fluid from the ground to the propulsion tool from the beginning during the embedding or from the beginning, injecting the high-pressure fluid upward from the propulsion tool so as not to hit the reciprocating pipe, As the propulsion force, the reciprocating pipe for heat exchange and the propulsion tool are propelled downward, and the injected high-pressure fluid is moved above the pile hole.
(4) When the reciprocating pipe for heat exchange reaches near the bottom of a preset pile hole, the injection of the high-pressure fluid is stopped, and the reciprocating pipe for heat exchange is held in that position, The propulsion tool is removed from the reciprocating pipe for heat exchange, and the propulsion tool is pulled up to the ground.
(5) Install the underground heat exchange pipe in the pile hole as described above.

  The high-pressure fluid in the above is mainly high-pressure water, but may be high-pressure air or a mixture of high-pressure air and high-pressure water.

  In this invention, since the propulsion tool having an upward injection port is attached to the U-shaped portion at the lower end of the heat exchange pipe, the heat exchange pipe can be used alone with a high-pressure fluid as a propulsive force even if there is a mud in the pile hole. Can be buried in pile holes filled with soil cement or muddy water. If a weight member is arranged at the lower end of the heat exchange pipe, a mechanism for attaching and detaching the propulsion tool can be installed, and the burying work of the heat exchange pipe can be made more efficient against buoyancy.

1A and 1B show a propulsion device according to an embodiment of the present invention, in which FIG. 1A is a side view showing a state in which the propulsion device is attached to a weight member, FIG. 1B is a front view, and FIG. 2A to 2E are longitudinal sectional views for explaining the embedding method of the present invention. FIG. 3 is a longitudinal sectional view showing a state in which the heat exchange pipe has been buried.

1. Materials used

(1) Heat exchange pipe 1
The heat exchange pipe 1 is configured by connecting the heat pipes 2 and 2 to the upward connection port of the U-shaped pipe connector 3 (FIGS. 1A and 1B).

(2) Propulsion tool 10
The propulsion device 10 is configured by connecting a supply pipe 13 for supplying high-pressure water from the ground 41 to the upper surface of the propulsion device main body 11 having injection ports 12 and 12 that can inject high-pressure water upward (FIG. 1 ( c)).

(3) Weight member 20
The weight member 20 is an H-section steel (having a height of about 30 to 100 cm) composed of flanges 22 and 23 and a web 24, and is configured by removing the lower end portion of the web 24 and forming an opening 28 (FIG. 1).
A locking tool 31 for housing the propulsion tool body 11 is provided on the outer surfaces of the flanges 22 and 23 of H-shaped steel (FIG. 1). The locking tool 31 includes an upper part 32 and a lower part 33, and the lower part 33 has a bottom lid 34 that holds the lower end part of the propulsion tool body 11 and prevents it from moving relatively downward. The upper part 32 has a frame shape and surrounds the outer periphery of the upper part of the holder body 11.
The heat exchange pipe 1 is disposed between the flanges 22 and 23 on the one surface 25 side of the web 24 of the weight member 20, and the pipe connecting portion 3 is positioned near the opening 28. Further, another heat exchange pipe 1 is disposed between the flanges 22 and 23 on the other surface 26 side of the web 24, and the pipe connecting portion 3 is positioned near the opening 28. Both pipe connection parts 3 and 3 are fixed by the connection material 5 which passes the opening 28 (FIG. 1).
When the heat exchange pipe 1 is held between the flanges 22 and 23 of the weight member 20 and the heat exchange pipes 1 and 1 are raised with respect to the weight member 20, the connection material 5 is connected to the web. 24, the heat exchange pipe 1 can be prevented from rising with respect to the weight member 20.

2. Embedding method

(1) A pile hole 42 is excavated from the ground 41 to a predetermined depth (for example, 15 m), cement milk is injected into the pile hole 42, and at least near the bottom of the pile hole 42 (root consolidation part) ) To form a soil cement layer. A concrete-made pile 43 having a hollow portion 44 is buried in the pile hole 42 (FIGS. 2A and 2B). At this time, in the case of a pile hole having a depth of 20 m, two ready-made piles 43 are necessary, and are buried while being joined up and down by a normal method. In addition, the ready-made pile 43 has a hollow portion 44 opened up and down, and the hollow portions 44 and 44 are also filled with soil cement.

(2) Subsequently, the heat exchange pipe 1 having the weight member 20 and the propulsion tool 10 attached to the lower end portion is inserted into the hollow portion 44 of the ready-made pile 43 from the ground (FIGS. 2B and 2C). At this time, the heat exchange pipe 1 is in a state where the heat pipes 2 and 2 having a required length (depth) are combined into one and wound. Moreover, it is also possible to embed the heat pipes 2 and 2 as appropriate.

(3) The heat exchange pipe 1 has the weight member 20 and can be lowered to a predetermined depth. However, when there is a mud block or the like in the middle of the descent, this becomes a resistance and the descent cannot be further performed. (FIG. 2 (c)).
In this case, high-pressure water is supplied from the ground 41 to the supply pipe 13, and high-pressure water is sprayed upward as indicated by the arrows from the injection ports 12 and 12 of the propulsion tool 10 (FIG. 2D). The heat exchange pipe 1 moves down to the bottom of the ready-made pile 43 (pile hole bottom) together with the propulsion tool 10 against this obstacle such as a mud mass using this as a driving force (FIG. 2 (e)).
At this time, since the high-pressure water is injected in the hollow portion 44 of the ready-made pile 43, there is no possibility of damaging the pile hole wall. Moreover, since the propulsion tool 10 is attached to the outer surface side of the flanges 23, 23, the high-pressure water does not hit the heat exchange pipe 1 disposed on the inner surface side of the flanges 22, 23.

(4) When the heat exchange pipe 1 reaches a predetermined depth, the propulsion tool 10 is stopped from spraying, the heat exchange pipe 1 is held on the ground 41, and the supply pipe 13 of the propulsion tool 10 is pulled from the ground 41. Then, the propulsion tool body 11 is pulled out from the locking tool 31, and the propulsion tools 10 and 10 are pulled up to the ground 41 (FIG. 2 (f)).

(5) By maintaining this state, the soil cement is solidified, and the U-shaped pipe connector 3 of the heat exchange pipe 1 is near the bottom of the ready-made pile 43 (near the bottom of the pile hole 42) together with the weight member 20. ). At this time, since the injected high-pressure water has a low specific gravity and moves above the pile hole, it does not affect the solidification of soil cement or the like near the bottom of the ready-made pile (near the bottom of the pile hole).

(6) The heat exchanging pipe 1 buried in this way is circulated through the refrigerant (water) in the heat pipes 2 and 2 by a normal method, near the bottom of the ready-made pile 43 (near the bottom of the pile hole 42). The heat of the ground can be taken out to the ground 41 (FIG. 3).

3. Other embodiments

(1) In the said embodiment, although the ready-made pile 43 was embed | buried in the pile hole 42, the heat exchange pipe 1 can also be embed | buried directly in the pile hole 42, without using the ready-made pile 43 (illustration is shown). Not)

(2) Further, in the above embodiment, the weight member 20 can be pushed down to the bottom of the pile hole 42 with a long rod-shaped push rod without using the pusher 10 or in combination with the pusher 10 ( Not shown). In this case, the tip of the push rod can be engaged with the connecting member 5 of the heat exchange pipe 1 to directly push down the heat exchange pipe 1 (not shown).

(3) Further, in the above embodiment, the weight member 20 may be shortened or lightened, or the weight member 20 may be omitted, and the heat exchange pipe 1 may be pushed down directly against the buoyancy by the propulsion tool 10 alone. Yes (not shown).

DESCRIPTION OF SYMBOLS 1 Heat exchange pipe 2 Heat pipe 3 Pipe connection tool 5 Connection material 10 Propulsion tool 11 Propulsion tool main body 12 Injection port 13 Supply pipe 20 Weight member 21 H-shaped steel 22, 23 Flange 24 Web 25 One side of web 26 Other side of web 27 Web lower edge 28 Opening 31 Locking tool 32 Locking tool upper part 33 Locking tool lower part 34 Lower bottom cover 41 Ground 42 Pile hole 43 Ready-made pile 44 Hollow part of ready-made pile

The present invention, relatively high temperature underground heat and ground relatively low thermal about the buried how the heat exchange pipe of geothermal heat utilized during the heat exchange.

FIG. 1 is a propulsion tool used in an embodiment of the present invention, in which (a) is a side view of a state in which the propulsion tool is attached to a weight member, (b) is a front view, and (c) is a perspective view. . 2A to 2E are longitudinal sectional views for explaining the embedding method of the present invention. FIG. 3 is a longitudinal sectional view showing a state in which the heat exchange pipe has been buried.

(1) Heat exchange pipe 1
The heat exchange pipe 1, the upward connection port of the U-shaped pipe connector 3, respectively configure by connecting heat pipe 2,2 (FIG. 1 (a) (b)) .

Claims (1)

A method for burying a heat exchange pipe for geothermal heat, characterized by being configured as follows.
(1) Excavate from the ground to form a pile hole of a predetermined shape, inject cement milk into the pile hole, and if necessary, embed a hollow ready-made pile in the pile hole.
(2) On the ground, a propulsion tool is attached to the lower end of the reciprocating pipe for heat exchange, and the reciprocating pipe for heat exchange and the propulsion tool are inserted into the pile hole or the hollow portion of the ready-made pile in the pile hole. And descend.
(3) Supplying high-pressure fluid from the ground to the propulsion tool from the beginning during the embedding or from the beginning, injecting the high-pressure fluid upward from the propulsion tool so as not to hit the reciprocating pipe, As the propulsion force, the reciprocating pipe for heat exchange and the propulsion tool are propelled downward, and the injected high-pressure fluid is moved above the pile hole.
(4) When the reciprocating pipe for heat exchange reaches near the bottom of a preset pile hole, the injection of the high-pressure fluid is stopped, and the reciprocating pipe for heat exchange is held in that position, The propulsion tool is removed from the reciprocating pipe for heat exchange, and the propulsion tool is pulled up to the ground.
(5) Install the underground heat exchange pipe in the pile hole as described above.

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