JP4281092B2 - Geothermal heat exchange tube installation device and installation method - Google Patents

Description

  The present invention relates to an apparatus and a method for vertically installing a heat exchange tube for heat storage and heat collection that uses underground heat as a heat source for air conditioning, snow melting, and the like.

The underground heat-utilizing heat exchange tubes installed vertically in the ground include plastic or steel U-tubes with a diameter of several tens of millimeters. Is inserted and filled with grout material. Some drilling depths reach several tens of meters to about 100 meters. As described in Patent Document 1, the heat exchange tube is provided with a spiral blade at the tip of one of the tip steel tube and the drilled steel tube, and the tip is closed below or above the spiral blade. A drilled steel pipe that can be detached from the tip steel pipe, a heat exchange tube that circulates a heat medium inserted and installed in the hole drilled by the drilled steel pipe, and a grout material in the hole around the heat exchange tube A grout tube and a grout material are prepared, and the drilled steel tube equipped with a tip steel tube is rotated and pressed into the ground to reach a predetermined drilling depth, and then the heat exchange tube is inserted into the drilled steel tube. Inserting and then rotating the drilled steel pipe in reverse, separating the tip steel pipe, pulling out and collecting the drilled steel pipe, and simultaneously filling the hole around the heat exchange tube with grout material and installing the heat exchange tube is there.
JP 2002-303088 A

However, the prior art has the following problems.
(1) Since the tip steel pipe is separated and the holed steel pipe is drawn and collected, the tip steel pipe provided with a spiral blade serving as a drilling blade remains in the ground and is consumed. However, each time a heat exchange tube is installed, preparing a worn-out tip steel pipe with a high manufacturing cost increases the cost of installing a ground heat heat exchange tube.

(2) Since it is necessary to grout the grout material in the form of a slurry with the ground grout mixer and pump it to the grout pipe, it requires a lot of labor and increases the cost of installing a heat exchange tube using underground heat.

  In order to solve the above problems, the present invention eliminates the excavation blade remaining in the ground, and can easily fill a granular material around the heat exchange tube with a ground heat utilization heat exchange tube installation device and It is to provide an installation method.

  The means employed by the present invention according to claim 1 is a digging casing in which a digging blade is provided on the lower end side and a space for inserting a heat exchange tube extending from the upper end port to the lower end port through the inner hollow portion is formed, A driving device that pushes the digging casing while rotating the digging casing; and a granular material filling device that is provided between the digging casing and the driving device. An opening / closing device that opens and closes, and a second injection means that is provided in the inner hollow portion and injects high-pressure water toward the lower side of the inner hollow portion, and the granular material filling device includes: an input portion of the excavation casing; An output part of the drive device is connected, and is provided on the outer side of the driving force transmission part and a driving force transmission part having a communication part communicating with the inner hollow part of the excavation casing. A particulate matter storage means having a storage area that communicates with the communication section, and a first injection means that injects high-pressure water from the storage area of the particulate matter storage means toward the communication portion of the driving force transmission section. It is an underground heat utilization heat exchange tube installation device.

  The means adopted by the present invention as set forth in claim 2 is a preparatory step in which the excavation casing and the drive device are connected by a granular material filling device using the underground heat utilization heat exchange tube installation device according to claim 1. Then, the excavation process for drilling holes to a desired depth by pushing the standing excavation casing with the lower end closed with a closed opening / closing device while rotating it with a driving device, and the opening / closing device opened A tube for opening the lower end port of the excavation casing and separating the particulate filling device from the excavation casing and inserting the heat exchange tube from the upper end port of the excavation casing toward the lower end of the space for inserting the heat exchange tube The insertion step and the granular material filling device are connected to the excavation casing, and the granular material stored in the storage area is guided by high-pressure water that is injected from the first injection means, and the communication portion of the driving force transmission portion is provided. To the inner hollow portion of the excavation casing, and with the high pressure water injected from the second injection means, the particulate matter is further guided to the lower side of the inner hollow portion of the excavation casing, and around the heat exchange tube. It consists of a granular material filling process that fills the inner hollow part with a granular material, and a drawing process that pulls out the casing for excavation from the ground. The preparation process, excavation process, pipe insertion process, granular material filling process, and extraction process are performed in this order. Geothermal heat utilization characterized by performing a preparation process, excavation process, and pipe insertion process in this order, or performing a granular material filling process and a drawing process in parallel or performing a plurality of times alternately. It is a heat exchange tube installation method.

  The ground heat utilization heat exchange tube installation device according to the present invention described in claim 1 includes an opening / closing device that opens and closes the lower end of the excavation casing, so that the heat exchange tube is inserted into the hole. The excavation casing can be pulled out together with the excavation blade, and the apparatus cost and the heat exchange tube installation cost can be reduced as compared with the conventional case in which the excavation blade remains in the ground. And the second injection means, it becomes possible to easily fill the granular material around the heat exchange tube with the high-pressure water ejected from the first and second injection means, and to grout the ground grout. The heat exchange tube installation cost can be reduced as compared with the conventional case where the slurry is made into a slurry by a mixer and pumped to the grout tube.

  According to a second aspect of the present invention, there is provided a method for installing a heat exchanging tube using geothermal heat, wherein the casing for excavation in a state in which the opening / closing device is opened in the extraction step can be extracted together with the excavating blade. The heat exchange tube installation cost can be reduced compared to the conventional case where it remains, and the particulate matter stored in the storage area in the particulate matter filling process is easily guided to the inner hollow part around the heat exchange tube with high-pressure water. Therefore, the heat exchange tube installation cost can be reduced as compared with the conventional method in which the grout material is slurried with a ground grout mixer and pumped to the grout tube. Further, in the granular material filling step, the granular material is guided with high-pressure water and moved downward from above the inner hollow portion of the excavating casing, so that the heat exchange tube inserted into the excavating casing may be levitated. And can be filled smoothly with granular materials.

  An underground heat-utilizing heat exchange tube installation device and installation method (hereinafter referred to as “the present invention installation device” and “the present invention installation method”) according to the present invention will be described based on the embodiments shown in the drawings.

  1 to 8 show an embodiment of the present invention, and FIG. 1 shows an installation apparatus 1 according to the present invention, in which (A) shows a drive device 2, a granular material filling device 3 and a casing for excavation. FIG. 4B is a front view showing a state in which 4 is separated and is partially omitted, and FIG. 4B is an intermediate illustration showing a preparatory process in which the drive device 2, the excavation casing 4 and the granular material filling device 2 are connected. It is the front view which carried out the fragmentary sectional view. FIG. 2 is an enlarged view showing a state in which the lower end opening 4c of the excavation casing 4 is closed by the opening / closing device 8. FIG. 2A is a bottom view of the excavation casing 4, and FIG. The front view of the lower end side of the casing 4 for excavation cut in the -b line, (C) is sectional drawing which expand | deployed the cover part 13b of each division | segmentation piece 13 of the closed state of the switchgear apparatus 8 along the c line of (A). It is. FIG. 3 is an enlarged front view of a state where the lower end 4c of the excavating casing 4 is opened by the opening / closing device 8. FIG. 4 is a partial cross-sectional front view showing an extension of the excavating casing 4. FIG. 5 is a front view showing a part of the excavation process of the installation method of the present invention, with the middle omitted and a partial cross section. FIG. 6 is a front view, partially omitted, showing the middle of the tube insertion step of the installation method of the present invention, and FIG. 6 (A) shows the heat exchange tube T inserted into the excavating casing 4 having the lower end 4c opened. (B) shows the state after the heat exchange tube T has been inserted into the excavation casing 4. FIG. 7 is a front view of the granule filling step and the drawing step of the installation method of the present invention, with the intermediate omitted and a partial cross section, (A) showing just before filling the excavation casing 4 with the granule B, (B) shows the middle of filling the granular material B while pulling out the casing 4 for excavation. FIG. 8 is a cross-sectional front view of the excavating casing 4 completely pulled out from the ground E with the middle omitted.

  First, the present invention installation device 1, the heat exchange tube T, and the packing B prepared for installing the heat exchange tube T in the ground E will be described.

  The heat exchange tube T circulates a heat medium (for example, water). As shown in FIG. 6, a long tube Ta made of flexible plastic and having an outer diameter of about 0.5 to 1.5 inches is used. It is preferable to use a tube in which two are arranged in parallel and the lower end communicates with a U-shaped tube Tb and is wound in a U-shape. However, it is also possible to use a stainless steel tube. The heat exchanging tube T is provided at its lower end with a pointed end portion Tc so that the heat exchanging tube T can be smoothly inserted when inserted into the excavating casing 4 described later.

  As shown in FIG. 8, the filling B filled around the heat exchange tube T is heat performed between the ground E and a heat medium (for example, water) stored or distributed in the heat exchange tube T. Silica sand, carbon grains, metal slag grains, etc. with excellent heat transfer characteristics are selected so that transmission is good, and granular materials that move smoothly by being guided by the high-pressure water sprayed during the particulate filling process are selected. The

  As shown in FIG. 1, the installation device 1 of the present invention includes a driving device 2, a granular material filling device 3, and a digging casing 4, and the driving device 2 and the digging casing 4 are detachably connected by the granular material filling device 3. I have to do it.

  As the driving device 2, as shown in FIG. 1B, an auger for raising and lowering provided on a leader 5 of a three-point pile driving machine (not shown) is used for pile construction.

  As shown in FIGS. 1A and 2B, the excavation casing 4 is provided on a casing body 6 formed of a steel pipe having an outer diameter of about 5 to 10 inches, and a lower end side of the casing body 6. A plurality of excavating blades 7 and an opening / closing device 8 that is provided integrally on the lower end side of the casing body 6 and opens and closes the lower end opening 4c are provided. The excavation casing 4 forms a heat exchange tube insertion space S that extends from the upper end port 4a to the lower end port 4c via the inner hollow portion 4b, and the casing hollow portion extends to the inner hollow portion 4b excluding the heat exchange tube insertion space S. The second injection means 9 extending along the direction, the drilling water supply pipe 12 and the operation bar 32 of the opening / closing means 14 are provided. The excavating casing 4 includes an excavating blade 7 and an opening / closing device 8 whose total length is several tens of meters. In addition to the tip casing main body 6, the excavating casing 4 has an intermediate length of several meters as shown in FIG. The casing body 6 is joined and extended through casing joints 19 and 20.

  As shown in FIG. 4, the intermediate casing body 6 is guided to the inner hollow portion 4 b excluding the heat exchange tube insertion space S, and a bracket 35 fixed to the casing body 6 and the bracket 35 movably guided by the bracket 35. 2, injection means 9, drilling water supply pipe 12 and operation rod 32, and dropout prevention tool 36 attached to each of injection means 9, drilling water supply pipe 12 and operation rod 32. By locking the tool 36, the injection means 9, the drilling water supply pipe 12, and the operation rod 32 are prevented from falling off. The injection means 9, the drilling water supply pipe 12 and the operation rod 32 can be moved up and down by the male screw and the cap nut provided at each end of the injection means 9, the drilling water supply pipe 12 and the operation rod 32. This is for the convenience of the joint work of the combination or the like.

  As shown in FIGS. 1 and 4, the second injection means 9 is joined to the pipe 9b and the pipe 9b with an appropriate vertical gap, and a plurality of high-pressure water jets are sprayed downward of the inner hollow portion 4b. The high-pressure water sprayed from the spout 9a is sprayed on the refill B that has moved to the inner hollow portion 4b of the excavation casing 4 during the granular material filling step. Is guided below the inner hollow portion 4b without being retained above the inner hollow portion 4b.

  As shown in FIGS. 2 and 3, the opening / closing device 8 includes a plurality of (three in the illustrated example) divided pieces 13 pivotally supported via a support portion 10 fixed to the lower end of the casing body 6, and Opening / closing means 14, each divided piece 13 (13-1 to 13-3) is in a hanging open state (see FIG. 2A) that opens the lower end port 4 c from a horizontal state in which the lower end port 4 c is closed (see FIG. 2A). 3)). The divided piece 13 is fixed to the shaft support portion 13a that forms the pivot 11, the lid portion 13b that is fixed to the shaft support portion 13a, opens and closes the lower end port 4c, and the radial edge portion of the adjacent divided piece 13 Thus, the closed state of the adjacent divided pieces 13 is maintained, and the claw portion 13c for maintaining the closing is provided (however, the divided piece 13-3 is not provided with the claw portion 13c for maintaining the closing). The opening / closing device 8 is provided with the claw portions 13c for maintaining the closure on the divided pieces 13-1, 13-2, so that the divided pieces 13-2, 13 are maintained when the open / close means 14 maintains the closed state of the divided pieces 13-1. -3 is also maintained, and when the opening / closing means 14 releases the closed state of the divided piece 13-1 and swings and opens the divided piece 13-1 with its own weight, the closed maintaining claw portion 13c The locked state is naturally released, and the divided pieces 13-2 and 13-3 are automatically opened by their own weight. The opening / closing means 14 is provided with an operating rod 32 inside the casing body 6 so as to be movable up and down, and the bent lower end 32 a is casing through the opening 6 a of the casing body 6 that forms the lower end side of the excavating casing 4. When guided to the outside of the main body 6 and the lower end portion 32a is locked to the locking portion 13d of the horizontal divided piece 13-1, the horizontal state of the divided piece 13-1 is maintained and the excavating casing 4 is When the operating rod 32 protruding from the end opening 4a is pulled up, this locking is released and the divided piece 13-1 is suspended by its own weight.

  As shown in FIG. 1A, the granular material filling apparatus 3 includes a driving force transmission unit 16, a granular material storage unit 17, and a first injection unit 18. The driving force transmission unit 16 connects the excavation casing 4 and the driving device 2, and is connected to an upper connection unit 21 connected to the output unit of the driving device 2 and an input unit 19 at the upper end of the excavation casing 4. A connecting portion 20 at the lower end to be connected and a communicating portion 15 communicating with the inner hollow portion 4b of the excavating casing 4 are provided. The granular material storing means 17 is provided outside the driving force transmitting portion 16, the lower end side of the cylindrical portion is formed in a funnel shape, a storing area 17 a is formed inside, and the lower side of the storing area 17 a is transmitted to the driving force transmitting side. It leads to the communication part 15 formed on the lower end side of the part 16. The first injection means 18 includes a pipe 18b and a jet outlet 18a joined to the pipe, and jets high-pressure water from the jet outlet 18a located on the lower end side of the storage area 17a toward the communication portion 15, The filler B stored in the storage area 17a is guided by high-pressure water and moved to the communicating portion 15.

  As shown in FIG. 2, the drilling water supply pipe 12 provided in the excavation casing 4 leads its lower end side to the outside of the casing body 6 through the opening 6 b of the casing body 6 of the excavation casing 4. Cutting water is discharged from the water port 12a to the vicinity of the excavating blade 7 so that cutting can be performed smoothly.

As shown in FIG. 1A, the high pressure water supply device 23 for supplying high pressure water to the first injection means 18, the second injection means 9 and the drilling water supply pipe 12 includes the first injection means 18 and the first injection means 18. An extension pipe 24 communicating with the two injection means 9, an extension pipe 23 communicating with the drilling water supply pipe 12, a switching valve 26 for switching the supply of high-pressure water to the extension pipes 23, 24, a switching valve 25 and the outside It consists of the extension piping 27 which connects the provided high-pressure water generator (not shown). The extension pipe 27 extends through the hollow portion 16a of the driving force transmission portion 16 of the granular material storage means 17 to the outside. High-pressure water (for example, 15 to 25 kg / cm ² ) supplied from a high-pressure water generator (not shown) is a time zone in which high-pressure water is injected from the drilling water supply pipe 12 by a switching valve 26 that is switched manually or automatically. Are switched between a time zone for injecting high-pressure water from the outlets 18a of the first injection means 18 and the outlets 9a, 9a of the second injection means 9, and a time period for stopping water supply. As shown in FIG. 5, the high-pressure water ejected from the ejection port 18 a of the first ejection unit 18 guides the filler B stored in the storage area 17 a and moves toward the communication unit 15 of the driving force transmission unit 16. The filler B is supplied to the inner hollow part 4b of the excavation casing 4 through the communication part 15, and the high-pressure water jetted from the plurality of jet ports 9a of the second jetting means 9 is supplied to the inner hollow part 4b. The filler B that has been supplied to is guided and moved toward the lower end of the inner hollow part 4b of the excavating casing 4 to fill the inner hollow part 4b excluding the heat exchange tube insertion space S with nectar. Thus, a hollow part without filling is not formed in the inner hollow part 4b.

  Next, each process and procedure of this invention installation method which installs the heat exchange tube T in the underground E using the said this invention installation apparatus 1 are demonstrated.

(Preparation Step) See FIG. 1 In the preparation step, the granular material filling device 3 is suspended by connecting the connecting portion 21 at the upper end of the granular material filling device 3 to the output portion of the driving device (auger) 2 and the granular material filling device. 3 is connected to the input portion 19 at the upper end of the excavating casing 4 to the connecting portion 20 at the lower end of the excavating casing 4, and the excavating casing 4 is suspended and prepared.

(Excavation process) Refer to FIG. 5 In the excavation process, the excavation casing 4 is suspended over the planned drilling position of the ground surface Ea (see FIG. 1 (B)), and then the lower end 4c is closed to the underground E. The standing excavation casing 4 closed by the open / close device 8 is pushed in while being driven to rotate by the drive device 2, thereby drilling to a desired depth while excavating with the rotating excavation blade 7. When the length of the excavation casing 4 becomes insufficient due to the drilling, the intermediate intermediate casing body 6 (see FIG. 4) is connected and extended via the casing joints 19 and 20, and the second injection is performed. The pipe 9b of the means 9, the drilling water supply pipe 12, and the extended portions of the operation rod 32 may be connected together. During excavation, the switching valve 26 is switched to supply high-pressure water to the excavation water supply pipe 12, and high-pressure water is jetted from the spout 12 a to the vicinity of the excavation blade 7.

(Pipe Insertion Step) See FIG. 6 In the pipe insertion step, the excavation casing 4 that has been drilled to a desired depth is slightly lifted to secure a space for hanging the divided pieces 13 of the switchgear 8, and then the excavation casing 4 is rotated. After stopping the driving, the operating rod 32 of the opening / closing means 14 is pulled up to hang the divided piece 13 of the opening / closing device 8 into the open state, and the granular material filling device 3 is separated from the excavating casing 4. Subsequently, one set or a plurality of sets (in the case of illustration, one set) of the heat exchange tubes T are inserted from the upper end port 4a of the excavation casing 4 toward the lower end of the heat exchange tube insertion space S. When inserting the heat exchange tube T, the heat exchange tube T is linearly modified along the longitudinal direction and inserted near the center of the inner hollow portion 4c of the excavation casing 4, so that the heat exchange tube T It is preferable to form a granular material filling space over the entire circumference.

(Particulate filling step) See FIGS. 7A and 7B. In the granular filling step, the connecting portion 20 at the lower end of the granular filling device 3 is connected to the input portion 19 at the upper end of the excavating casing 4 and the granular filling is performed. A predetermined amount of the filler B is stored in the storage area 17a of the apparatus 3, and then the switching valve 26 is switched to guide the particulate matter B one after another with the high-pressure water injected from the outlet 18a of the first injection means 18. Then, it is supplied to the inner hollow portion 4b of the excavating casing 4 through the communicating portion 15 of the driving force transmitting portion 16, and is guided by the high-pressure water jetted from each jet outlet 9a from the second jetting means 9, and the particulate matter B is introduced. Further, it is moved toward the lower end of the inner hollow portion 4b, and the inner hollow portion 4b around the heat exchange tube T is filled with the particulate matter B. In this step, the granular material B is guided with high-pressure water and moved downward from above the inner hollow portion 4b of the excavation casing 4, so that the heat exchange tube T inserted into the excavation casing 4 in the tube insertion step. The granular material B can be filled smoothly without floating.

(Case Extraction Process) See FIG. 7B In the casing extraction process, the excavation casing 4 is extracted from the underground E.

(Work procedure)
The installation method of the present invention is a method (first procedure) in which the preparation process, excavation process, pipe insertion process, granule filling process and drawing process are performed in this order, or the preparation process, excavation process and pipe insertion process are performed in this order. After that, there are a granular material filling step and a drawing step performed in parallel (second procedure) or alternately performed a plurality of times (third procedure). When performing the drawing step after the granular material filling step in the first procedure, in the granular material filling step, the whole or almost the entire inner hollow portion 4b around the heat exchange tube T is filled with the granular material B, and the ground is removed in the drawing step. The entire casing 4 for excavation is pulled out from the middle E. Further, in the case where the granular material filling step and the drawing step are performed in parallel in the second procedure, or in the third procedure, the filler B is drawn while the drawing step for drawing the excavating casing 4 by an appropriate size and the drawing is stopped. In the case where the granule filling process for filling the container is repeated a plurality of times alternately, the filling material B into the space formed with the extraction of the excavation casing 4 (the space formed by the withdrawal of the excavation casing 4) Can be reliably transferred. When all the steps are completed, as shown in FIG. 8, an installation structure of the heat exchange tube T in which the heat exchange tube T inserted into the vertical hole Eb in the ground E is filled with the filler B can be obtained. it can.

  In the installation method of the present invention using the installation device 1 of the present invention, it becomes possible to pull out the excavation casing 4 with the opening / closing device 8 open together with the excavation blade 7 in the extraction process, and the excavation blade 7 is inserted into the ground. The heat exchange tube installation cost can be reduced as compared with the conventional case in which the particulate matter B is stored in the storage region 17a in the particulate matter filling step, and the high pressure water is supplied to the inner hollow portion 4b around the heat exchange tube T. Therefore, the heat exchange tube installation cost can be reduced as compared with the conventional case where the grout material is slurried with an above-ground grout mixer and pumped to the grout pipe.

The present invention shows an installation device, in which (A) is a front view of the drive device, granular material filling device and excavation casing separated from each other, with the intermediate omitted and partially sectioned, (B) is the drive device, excavation It is the front view which abbreviate | omitted the intermediate | middle which shows the preparatory process which connected the three of the casing and the granular material filling device, and was partially cut. The state which closed the lower end port of the casing for excavation with the switchgear is expanded, and (A) is a bottom view of the casing for excavation, and (B) is excavation which cut along the bb line of (A). The front view of the lower end side of the casing for use, (C) is a cross-sectional view in which the lid portion of each divided piece in the closed state of the switchgear is developed along line c of (A). It is the front view which expanded and expanded the state which opened the lower end port of the casing for excavation with the opening / closing apparatus. It is the front view which carried out the partial cross section which shows the extension part of the casing for excavation. It is the front view which abbreviate | omitted the middle which shows the middle of the excavation process of this invention installation method, and was partially cut. BRIEF DESCRIPTION OF THE DRAWINGS It is the front view which abbreviate | omitted the intermediate | middle which shows the middle of the pipe | tube insertion process of this invention installation method, and was partially cross-sectional, Comprising: (A) shows just before inserting a heat exchange tube in the casing for excavation which opened the lower end port, ( B) shows the heat exchanging tube inserted into the excavating casing. BRIEF DESCRIPTION OF THE DRAWINGS It is the front view which omitted the intermediate | middle which shows the granular material filling process and drawing process of this invention installation method, and was partial cross section, Comprising: (A) shows just before filling a granular material into the casing for excavation, (B) is excavation It shows the middle of filling the granular material while pulling out the casing for use. It is the front view which abbreviate | omitted the state which pulled out the excavation casing completely from underground, and was cross-sectioned.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Present invention installation apparatus, 2 ... Drive apparatus, 3 ... Granular substance filling apparatus, 4 ... Excavation casing, 4a ... Upper end port, 4b ... Inner hollow part, 4c ... Lower end port, 5 ... Leader, 6 ... Casing main body, DESCRIPTION OF SYMBOLS 7 ... Excavation blade, 8 ... Opening / closing device, 9 ... 2nd injection means, 9a ... Outlet, 9b ... Pipe, 10 ... Support part, 11 ... Pivot support, 12 ... Excavation water supply pipe, 12a ... Spout, 13 ... Split piece, 13a ... Shaft support part, 13b ... Lid part, 13c ... Closure part, 13d ... Locking part, 14 ... Opening / closing means, 15 ... Communication part, 16 ... Driving force transmission part, 16a ... Hollow part , 17 ... granular material storage means, 17a ... storage area, 18 ... first injection means, 18a ... jet outlet, 18b ... piping, 19 ... input part, 20 ... lower end connection part, 21 ... upper end connection part, 23 ... high pressure water supply device, 24, 25 ... extension pipe, 26 ... switching valve, 27 ... extension pipe, 32 Operation rod, 32a ... locking tip, 35 ... guide bracket, 36 ... fall prevention member, E ... underground, Ea ... ground surface, Eb ... drilling hole, T ... heat exchange tube, B ... filler, S ... Space for heat exchange tube insertion

Claims (2)

Excavation blade is provided on the lower end side, a excavation casing in which a space for inserting a heat exchange tube extending from the upper end port to the lower end port through the inner hollow portion is formed, and a drive device that pushes in while rotating the excavation casing, A granule filling device provided between the excavation casing and the drive device, wherein the excavation casing is provided integrally with the lower end of the casing and opens and closes the lower end, and is provided in the inner hollow portion. And a second injection means for injecting high-pressure water toward the lower side of the inner hollow portion, the granular material filling device connects the input portion of the casing for excavation and the output portion of the drive device, A driving force transmission part having a communication part communicating with the inner hollow part of the casing for excavation, and a granular material storage having a storage area provided outside the driving force transmission part and leading to the communication part of the driving force transmission part A heat exchange tube installation apparatus using geothermal heat, comprising: a stage; and first injection means for injecting high-pressure water from the storage area of the granular material storage means toward the communication portion of the driving force transmission unit . A preparation step of preparing the excavation casing and the drive device by connecting them with a granular material filling device using the underground heat-utilizing heat exchange tube installation device according to claim 1, and opening and closing the lower end port closed in the ground The excavation process of drilling to the desired depth by pushing the standing excavation casing closed by the device while rotating it with the drive device, and opening and closing the lower end of the excavation casing with the open / close device open Separating the granular material filling device from the casing for excavation and inserting a heat exchange tube from the upper end of the excavation casing toward the lower end of the space for inserting the heat exchange tube; and the granular material filling device for the excavation casing The particulate matter stored in the storage area is guided by high-pressure water injected from the first injection means and supplied to the inner hollow portion of the excavation casing through the communication portion of the driving force transmission portion. In addition, the granular material is further guided by the high-pressure water sprayed from the second injection means to the lower side of the inner hollow portion of the excavation casing, and the inner hollow portion around the heat exchange tube is filled with the granular material. It consists of a filling process and a drawing process for pulling out a casing for excavation from the ground, and a preparation process, a drilling process, a pipe insertion process, a granular material filling process and a drawing process are performed in this order, or a preparation process, a drilling process and After performing a pipe | tube insertion process in this order, a granular material filling process and a drawing-out process are performed in parallel, or are performed several times alternately, The ground heat utilization heat exchange tube installation method characterized by the above-mentioned.

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