JP5442425B2 - Underground heat collection / radiation pipe installation method - Google Patents

Description

  The present invention relates to a method for installing a ground heat collection / radiation pipe, and more particularly, to a method for burying a collection / radiation pipe for use in underground heat as a heat source for air conditioning and snow melting.

  A so-called sampling / radiating pipe buried deep underground, that is, a heat exchange medium such as water containing antifreeze liquid is circulated in a tube for underground heat exchange, and a so-called heat pump installed on the ground is used for air conditioning and snow melting. The geothermal heat pump system is attracting attention as an energy-saving technology that is friendly to the global environment, and is already widely used in Europe and the United States. Since this system has a constant temperature throughout the year, it is cold in summer, warm in winter, and the ground (the ground) as a heat source, compared to a general heat pump system that uses air as a heat source, it requires less energy to operate the heat pump. There is an advantage of saving several tens of percent.

  On the other hand, in the case of an air heat source, an initial investment is required to install a sampling / radiating pipe that circulates an unnecessary heat exchange medium in the ground, and the installation cost of the sampling / radiating pipe is high. However, it was a big problem of the geothermal heat pump system. In other words, if the installation cost of the sampling / radiating pipe is high, even if the power cost required for operation is low, it is not economically appropriate, so the spread of the geothermal heat pump system does not proceed.

  Generally, in the underground heat pump system, the sampling / radiating pipe is buried by drilling a vertical hole with a diameter of about 15-20 cm by drilling into a bedrock of a depth of 50-200 m, and the sampling / radiating pipe to the bottom of the vertical hole. After insertion, a method of filling the gap between the holes with grout or the like and sealing it has been used.

  As the sampling / radiating tube, a resin tube such as a polyethylene tube is often used from the viewpoint of economy and workability. In addition, drilling using drilling machines has the advantage of being able to drill holes in rock and forming deep holes deep into the ground, while mud soil mixed with bentonite is discharged during drilling operations. However, there is a drawback that the processing is not easy.

  In addition, since the drilled hole is filled with muddy water such as bentonite liquid, even if the sampling / radiating pipe is inserted as it is, it floats up by buoyancy, so that the lifting / prevention is prevented in advance. Some measures were necessary, such as filling the radiator pipe with water.

  Drilling with this boring machine is suitable in Europe and the United States where there are many calcareous grounds that are easy to drill, and this method is mainly used, but in Japan where the formation is complex and there are many hard rocks, drilling is performed with a boring machine. Was inefficient, expensive to work, and not always suited to the situation.

  Therefore, several methods have been proposed for efficient excavation in order to embed the sampling / radiating pipe at a shallow depth of several tens of meters rather than to the bedrock without using a boring machine that causes high costs. .

JP 2002-303088 A JP 2007-17138 A JP 2009-41894 A

None

  In Patent Document 1, after rotating and penetrating the upper and lower steel pipes provided with screwed spiral blades near the tip into the ground, the sampling / radiating pipe is inserted into the steel pipe, and the upper steel pipe is separated from the lower steel pipe, A method for installing a steel pipe tube using underground heat that fills the gap in the hole while pulling out the upper steel pipe is disclosed in Patent Document 2, in which a hole is excavated with an auger type excavator, the auger is pulled out, and then into the hole. A heat exchange well forming method in which a sampling / radiating tube is inserted and finally filled with earth and sand in the gap in the hole is disclosed in Patent Document 3, in which a steel tube having a spiral blade plate welded to the outer peripheral portion of the tip is rotated and penetrated. / Ground heat exchange methods are disclosed in which a heat radiating pipe is inserted to the bottom of the steel pipe, and then the steel pipe is reversed and pulled out, and a gap in the hole is filled with earth and sand, and a sampling / radiating pipe is buried in the ground.

  In the method disclosed in Patent Document 1, the upper steel pipe (drilled steel pipe) and the lower steel pipe (tip steel pipe) have a detachable connection structure. As a specific example thereof, a protrusion and a key-shaped notch are used. The combination is shown, and it is explained so that the connecting portion can be detached and detached from the tip steel pipe by rotating the hole-piercing steel pipe in the reverse direction. However, the inventors conducted several field experiments to disconnect the connecting portion having a structure similar to this, but could not easily disconnect it. This is because pebbles or the like are sandwiched between the key-shaped cuts and the cuts do not move easily even if they are rotated in the reverse direction. In the method disclosed in Patent Document 1, the upper steel pipe and the lower steel pipe are easily separated. In that respect, it must be said that it has a practically serious defect.

  On the other hand, in the method disclosed in Patent Document 2, the timing of inserting the sampling / radiating pipe into the hole excavated with the auger type excavating blade is not particularly mentioned, and in reality, the auger type excavating blade is used. However, in such a construction method, there is a possibility that the hole wall of the excavated hole wall may collapse on the ground of sandy, gravel or soft viscosity. Therefore, it may be difficult to insert the sampling / radiating tube and fill the gap in the hole. In order to prevent this, some measures were required, such as preventing the collapse of the hole wall using a casing or mud for excavation, and this required extra time. Also, there is no description of a specific method of filling the gap in the hole with earth and sand, but even if the hole wall does not collapse, filling the earth and sand into a very narrow and narrow space where the sampling / radiating pipe is arranged is not Unless special equipment is used, it is practically difficult, and in this respect, the method disclosed in Patent Document 2 is impractical.

  In addition, in the method disclosed in Patent Document 3, a spiral excavator is used to insert a sampling / radiating pipe (ground heat exchanger) into a leading conduit penetrated to a predetermined depth. There is a problem that it takes time and cost because it is necessary to remove the intruded earth and sand. Also, in this method, after inserting the sampling / radiating tube, when the tip conduit is rotated backward, the anti-rotation plate is attached to the lower end of the sampling / radiating tube to prevent the sampling / radiating tube from rotating together. Although it is attached, since this anti-rotation plate is not firmly fixed in the ground, there is a possibility that it will rise together and be pulled out together with the leading steel pipe. And it had the same problem as patent document 2 regarding the filling of the earth and sand to the space | interval in a hole.

Generally, a resin tube used as a sampling / radiating tube is wound in a ring shape with a diameter of about 1.5 m from immediately after manufacture until it is brought into the field. Even if it is inserted into the casing, it is not easily linear. For this reason, the following two conflicting structures are required for the coupling mechanism for keeping the tip of the sampling / radiating tube at a predetermined depth.
1) Because of the curl, the tip of the sampling / radiating tube is not normally oriented vertically, but even if the curl remains, the tip of the sampling / radiating tube can be reliably stopped at a predetermined depth. about.
2) Because of the curl, the sampling / radiating tube is in contact with the inner wall of the casing. When the casing is pulled backward and pulled out, it is rubbed with the inner wall, and the sampling / radiating tube is It may be twisted or behave together. Therefore, the tip of the sampling / radiating tube should not be easily detached from the connection structure.

  In other words, the undergrounding of the sampling / radiating tube requires a connecting mechanism having two contradictory functions that the tip of the sampling / radiating tube is easily connected to the locking member and is difficult to come off.

  Further, as a problem common to the methods disclosed in these patent documents, there is a step of filling the gap in the hole with a grout material or earth and sand after the sampling / radiating tube is inserted. That is, although the drilling efficiency is higher than the method using a boring machine, the economic effect of the drilling efficiency may be significantly reduced due to the increase in the time required for gap filling and the cost of equipment for that purpose. .

  In addition, cement milk or cement mortar is usually used as the grout material, and Patent Document 1 proposes to use a special material having excellent thermal conductivity as the grout material. Even if a special material with high thermal conductivity is used in such a limited range, an effect sufficient to meet the cost increase due to that should not be expected.

  The present inventor conducted research to solve the above-mentioned conventional problems in a method of burying a sampling / radiating pipe for using geothermal heat as a heat source for air conditioning and snow melting, etc. It is possible to securely fix the tip of the radiating pipe to the ground at the desired depth, prevent the sampling / radiating pipe from being pulled up when the casing is pulled out, and fill the gap in the hole generated between the excavation hole and the sampling / radiating pipe We have succeeded in developing a method for using underground heat collection / radiation pipes that can embed a heat radiation pipe / radiation pipe at a predetermined depth easily and reliably at a low cost without the need for a process and equipment to be used. To do.

A casing made of a steel pipe, with a spiral blade for rotation penetration fixed to the outer periphery near the tip, and a rotation transmission fitting fixed to the inner peripheral surface near the tip,
The lower end of a short pipe having an inner diameter slightly larger than the outer diameter of the casing is closed by a disk-shaped bottom plate, and a drilling blade is fixed to the lower surface of the bottom plate, and the upper surface of the casing rotates. A rotary passive metal fitting to be coupled to the transmission metal fitting and a coupling tool to be connected to a fitting attached to the lower end of the sampling / radiating pipe are fixed, and a tip shoe having a plate-like blade fixed to the outer peripheral surface,
A sampling / radiating pipe in which the ends of a pair of long tubes are connected and connected by a connector having a pipe line bent in a U-shape,
Prepare the casing, connect the rotary transmission bracket of the casing and the passive passive bracket of the tip shoe, attach the tip shoe to the tip of the casing, place the casing on the ground with the tip shoe down, and rotate it After applying force to rotate the tip shoe into the ground to the target depth, insert the sampling / radiating pipe from the upper end opening of the casing toward the lower side of the casing, and connect the connector at the lower end to the tip. After the shoe was connected to the shoe connector, the above problem was solved by rotating the casing in the reverse direction and pulling the casing out of the ground, leaving the tip shoe and the sampling / radiating pipe connected to the shoe in the ground.

1) Since the earth and sand are not discharged to the ground, no residual soil treatment is required.
2) Since the excavating blade is provided on the tip shoe, the excavation resistance is reduced, and the casing can be easily rotated and penetrated.
3) Since a detachable tip shoe is attached to the tip of the casing, a cavity can be secured in the casing, and a sampling / radiating tube can be easily inserted and connected.
4) Since the rotary transmission metal fitting and the rotary passive metal fitting are positioned in the casing cavity, they can be attached and detached easily and reliably.
5) When the casing is pulled out, earth and sand enters the tip shoe that remains in the ground and becomes heavier, and the blades are biting into the ground. Can be prevented reliably.
6) After pulling out the casing, the gap generated around the sampling / radiating tube disappears in a short period of time by using a casing having a small diameter, and the gap filling work is unnecessary.
It is possible to embed a sampling / radiating pipe in the ground to use geothermal heat as a heat source for air conditioning and snow melting with high accuracy, high efficiency and low cost.

The longitudinal cross-sectional view of the casing used in the ground-heat utilization collection / radiation pipe installation method which concerns on this invention. The expanded longitudinal cross-sectional view of the front-end | tip shoe used in the ground heat utilization sampling / radiation pipe installation method according to the present invention. The front view of the sampling / radiating pipe used in the ground heat utilization sampling / radiating pipe installation method according to the present invention. Enlarged cross section of the casing and tip shoe showing the position of the rotary transmission fitting fixed to the casing and the rotary passive fitting fixed to the tip shoe used in the ground heat utilization / radiating pipe installation method according to the present invention Figure. Similarly, the enlarged longitudinal sectional view. The expanded sectional view of the casing and front-end | tip shoes explaining the coupling | bonding state of a casing, front-end | tip shoes, and a sampling / radiating pipe. The expanded longitudinal cross-sectional view of the tip shoe which showed the other example of the attachment position of the coupling tool provided in a casing and a tip shoe. Explanatory drawing which showed the rotation penetration method of the casing by a pile driver. Explanatory drawing which showed the procedure of construction of the ground heat utilization collection / radiation pipe installation method which concerns on this invention. The expanded longitudinal cross-sectional view of the casing and tip shoe which showed the rotation transmission metal fitting and rotation passive metal fitting which are used in Example 2 of this invention. Similarly, the expansion perspective view of a rotation transmission metal fitting and a rotation passive metal fitting. The expanded sectional view of the tip shoe which showed the connector used in Example 3 of the present invention. The expanded sectional view of the tip shoe which showed the connector used in Example 3 of the present invention.

  A short tube tip shoe made of steel pipe and having a spiral blade on the outer periphery and having a drilling blade attached to the tip of the casing is detachably attached, and the casing is rotated and penetrated to the desired depth. The most significant feature is that the casing is pulled out with the tip ends connected and the tip shoe and the sampling / radiating pipe left in the ground.

  First, the casing 1, the tip shoe 5, and the sampling / radiating tube 11 used in the present invention will be described.

  In FIG. 1, reference numeral 1 denotes a casing, and the casing 1 is a temporary steel pipe used for burying a sampling / radiating pipe 11. In addition, since the embedding depth of the sampling / radiating pipe 11 in the present invention is 10 m to several tens of m, the casing 1 is configured by connecting several single pipes in the field. Since this casing 1 is used repeatedly in principle, it is preferable not to connect single pipes by welding but to connect them using a detachable mechanical joint. The mechanical joint is convenient to manufacture because it has a high manufacturing cost but can be connected in a short time compared to field welding. In Example 1, three single pipes having an outer diameter of 165.2 mm and a length of 6 m are connected using a mechanical joint. Moreover, it is desirable to make the diameter of the casing 1 as small as possible. That is, as the diameter of the casing 1 is smaller, the penetration resistance can be reduced, and the gap generated around the sampling / radiating pipe 11 after being pulled out can be reduced. It is preferable to make it about 10 to 50 mm larger than the cross-sectional dimension of the heat radiating tube 11.

  One or more spiral blades 2 for rotational penetration are fixed to the outer peripheral surface near the tip of the casing 1, and the tip shoe 5 described below is attached to the inner peripheral surface near the tip. A rotation transmission metal fitting 4 which is coupled to the rotation passive metal fitting 3 and transmits a rotational force thereto is fixed. As shown in FIG. 4, the rotary transmission metal fitting 4 is composed of a pair of protrusions formed so as to be opposed to a portion displaced by 180 ° in the diameter direction of the inner peripheral surface near the tip of the casing 1.

  On the other hand, 5 in the figure is attached to the tip side of the casing 1 and is a tip shoe for excavating the ground 19, preventing infiltration of earth and sand into the casing 1, and fixing the ground of the sampling / radiating pipe 11. It consists of a short tube having an inner diameter slightly smaller than the outer diameter of 1, and the lower end is closed by a bottom plate 6. Further, a triangular excavation blade 7 is fixed to the lower surface of the bottom plate 6. Further, on the upper surface of the bottom plate 6, a rotary passive metal fitting 3 for engaging with the rotation transmission metal fitting 4 of the casing 1 and transmitting a rotational force from the casing 1 to the tip shoe 5 is fixed. As shown in FIG. 4, the rotary passive metal fitting 3 is a member that is disposed in the diameter direction of the bottom plate 6 and has a rectangular parallelepiped shape that is slightly shorter than the diameter of the bottom plate 6.

Further, a connecting tool 10 that engages with a connecting tool 9 attached to the lower end of the sampling / radiating tube 11 described below is fixed to the upper surface of the rotary passive metal fitting 3.
As shown in FIG. 2, the coupler 10 has a cylindrical base portion 23 concentrically attached to the upper surface of the bottom plate 6 and an annular protrusion 27 extending inward or on the upper edge of the bottom plate 6. It consists of The connector 10 may be directly fixed to the upper surface of the bottom plate 6 as shown in FIG. 7 instead of the upper surface of the rotary passive metal fitting 3.

  The sampling / radiating pipe 11 is a pipe that circulates a heat exchange medium such as water containing antifreeze liquid in order to collect underground heat and radiate heat into the ground, and has a U-shaped pipe line 22 formed therein. The lower ends of a pair of long tubes 35 made of synthetic resin such as polyethylene are connected to the respective pipe opening ends of the connection tool 26 for circulating the heat exchange medium. A connecting tool 9 connected to the connecting tool 10 of the tip shoe 5 is attached.

  As shown in FIG. 3, the connector 9 includes a flange portion 32 that protrudes to the left and right, a rod-shaped insertion portion 24 that hangs downward from the center of the collar portion 32, and a substantially lower end provided at the lower end of the insertion portion 24. It is composed of a triangular locking piece 25, the lateral width of the collar portion 32 is larger than the interval between the annular projections 27, 27 of the connector 10, and the lateral width of the locking piece 25 is the annular projection 27, 27 is set so as to be slightly smaller than the gap between 27.

  The center of the collar portion 32 is pivotally supported by the connector 26 with a pin 30, and the connector 9 is swingably attached to the lower end of the sampling / radiating pipe 11.

  Next, a method of burying the sampling / radiating pipe 11 in the ground using the casing 1, the tip shoe 5, and the sampling / radiating pipe 11 will be described.

  First, the tip shoe 5 is attached to the lower end of the casing 1, the rotary transmission metal fitting 4 and the rotary passive metal fitting 3 are engaged, and the pile driving machine 18 is used to rotate through as shown in FIG. 8. At this time, due to the engagement between the rotation transmission fitting 4 of the casing 1 and the rotation passive fitting 3 of the tip shoe 5, the tip shoe 5 rotates in the same manner as the casing 1, and as shown in FIG. Although excavation is performed, the excavation blade 7 is attached to the lower surface of the tip shoe 5, so that excavation resistance is reduced and rotation penetration of the casing 1 is facilitated. At the time of penetration, earth and sand corresponding to the volume of the caging 1 are compressed and pressed to the side of the caging 1 and are not discharged to the ground.

  In the first embodiment, the gap between the casing 1 and the tip shoe 5 is about 2 mm, but no earth or sand is inserted into the casing 1 at the time of rotation penetration, almost no groundwater enters, and the casing 1 is empty. The torso state continues to be maintained.

  Then, as shown in FIG. 9 (b), once the casing 1 has penetrated to the target depth, the rotation is temporarily stopped, and then the casing 1 is slightly rotated in the reverse direction to separate the rotary transmission fitting 4 and the rotary passive fitting 3 from each other. 9A, while applying a pulling force to the casing 1 while repeating forward and reverse rotations with small rotational vibrations, gradually pulling it up, as shown in FIG. When it is above the upper end of the metal fitting 3, the pulling up of the casing 1 is temporarily stopped, and as shown in FIG. 9 (d), the sampling / radiating pipe 11 is inserted from the upper end of the casing 1 to the inside thereof. The connecting tool 9 attached to the lower end of the shoe is connected to the connecting tool 10 of the tip shoe 5.

  Since the connecting tool 10 is swingably attached to the connecting tool 26 of the sampling / radiating tube 11 by the pin 30, the connecting tool 10 is always directed in the vertical direction by its own weight. Even if there is a curved hook, the locking piece 25 having a triangular shape, that is, an arrow shape, smoothly passes through the gap between the annular protrusions 27 and 27 of the connector 10 and enters the interior of the connector 10. . Thus, once the locking piece 25 passes through the gap between the annular projections 27, 27 as shown in FIG. 6, the axial center of the gap between the locking piece 25 and the annular projections 27, 27. Unless the two completely match, the connector 9 cannot be removed from the connector 10.

  Contrary to the above, after the insertion / connection operation of the sampling / radiating pipe 11 is performed, the rotation transmission metal fitting 4 and the rotation passive metal fitting 3 may be separated.

  Thereafter, the casing 1 is rotated in the reverse direction, and the casing 1 is pulled out from the ground 19 by the screw action of the spiral blade 2. Then, as shown in FIG. 9 (e), the tip shoe 5 and the sampling / radiating pipe 11 connected thereto are left in the ground 19, and the burying operation to the desired depth of the sampling / radiating pipe 11 is completed. . After the casing 1 is pulled out, a gap 33 is formed around the sampling / radiating pipe 11, but this is filled with the surrounding earth and sand in a short time, so that it is left as it is. no problem.

This Example 1 has the configuration as described above,
1) Since the earth and sand are not discharged to the ground, no residual soil treatment is required.
2) Since the excavating blade is provided on the tip shoe, the excavation resistance is reduced, and the casing can be easily rotated and penetrated.
3) Since a detachable tip shoe is attached to the tip of the casing, a cavity can be secured in the casing, and a sampling / radiating tube can be easily inserted and connected.
4) Since the rotary transmission metal fitting and the rotary passive metal fitting are positioned in the casing cavity, they can be attached and detached easily and reliably.
5) When the casing is pulled out, earth and sand enter the tip shoe that remains in the ground and becomes heavier, and the blades are biting into the ground. Can be prevented reliably.
6) After pulling out the casing, the gap generated around the sampling / radiating tube disappears in a short period of time by using a casing having a small diameter, and the gap filling work is unnecessary.
It is possible to embed a sampling / radiating pipe in the ground to use geothermal heat as a heat source for air conditioning and snow melting with high accuracy, high efficiency and low cost.

  The inventors conducted a field test in order to confirm the performance of Example 1. That is, using a casing 1 in which three steel pipes having an outer diameter of 165.2 mm and a length of 6 m are connected by a mechanical joint, and a spiral blade 2 having an outer diameter of 350 mm is welded to the outer periphery of the lower portion, The heat radiating tube 11 was buried to a depth of 18 m. The ground 19 was soft clay soil up to the upper 12 m, sandy soil with an N value of 10 to 40 below 12 m, and the ground hardened with depth.

  The test was conducted four times, but the average time required for excavation to the target depth of 18m was 1.5 hours, which was significantly shorter than the 3-4 hours when using a conventional boring machine. did. In addition, a comparative test was conducted with and without the excavation blade 7 provided on the bottom plate 6 of the tip shoe 5. When the excavation blade 7 was provided, the penetration efficiency in the hard sand layer was improved. On the other hand, at the time of excavation to the target depth, not only earth and sand but also groundwater did not enter the casing 1. This is thought to be because fine soil particles were clogged in the upper part of the gap of about 2 mm between the casing 1 and the tip shoe 5 to prevent water from entering. For this reason, even the sampling / radiating pipe 11 that is light and strong in bending can be smoothly inserted into the casing 1.

  Also, the lower end of the sampling / radiating tube 11 and the tip shoe 5 can be easily connected. Both the connecting tool 9 attached to the lower end of the sampling / radiating tube 11 is lowered until it contacts the connecting tool 10 of the tip shoe 5. Were connected easily, and once connected, even if the pulling force was applied to the sampling / radiating tube 11 by turning left and right, it never came off.

  Further, after connecting the sampling / radiating pipe 11 to the tip shoe 5, the casing 1 is reversely rotated by about 90 ° to make the rotary transmission bracket 4 neutral, and lightly applied to the casing 1 by the pile driver 18 while applying a pulling force. The forward / reverse rotation was repeated and the casing 1 was pulled out about 10 cm. At this time, the depth of the tip shoe 5 was measured, but no pull-up was recognized. As a result, it was confirmed that the rotary transmission metal fitting 4 was completely detached from the rotary passive metal fitting 3, and the plate-like blade 21 attached to the side surface of the tip shoe 5 bites into the ground 19 and the tip shoe 5 is removed. It was confirmed that it effectively prevented the rise.

  Thereafter, the casing 1 was reversely rotated and completely pulled out from the ground, but the sampling / radiating tube 11 did not rise together and remained at a predetermined depth. Immediately after the casing 1 was pulled out, a gap 33 was formed around the sampling / radiating tube 11, but with the passage of time, the surrounding earth and sand gradually approached and the gap 33 narrowed. Can no longer be confirmed.

  The rotation penetration operation of the casing 1 is normally performed in a normal rotation. However, when the ground 19 near the tip of the casing 1 is hard, the casing 1 is sometimes rotated in the reverse direction to reduce the torque acting on the casing 1 or increase the penetration speed. In this case, the casing 1 is pulled out. However, in the combination of the rotary transmission metal fitting 4 and the rotary passive metal fitting 3 shown in the first embodiment, when the casing 1 is rotated in the reverse direction, both of them are detached, and the tip shoe There was a risk that 5 would fall out of casing 1.

  Therefore, in the second embodiment, special consideration is given to the structure so that the rotary transmission metal fitting 4 and the rotary passive metal fitting 3 are not detached when the casing 1 rotates in the reverse direction. As shown in FIGS. In addition to using the T-shaped rotary transmission fitting 4 and the T-shaped rotary passive fitting 3, it is formed on both sides of the rotary passive fitting 3 on the notch portion 28 formed on the side surface of the rotary transmission fitting 4 during reverse rotation. In this manner, the projecting piece 29 is covered, thereby preventing the rotation transmission metal fitting 4 and the rotation passive metal fitting 3 from being detached, and the certainty of construction is improved. Since other components are the same as those in the first embodiment, the description thereof is omitted.

  The third embodiment relates to the couplers 9 and 10 for coupling the sampling / radiating tube 11 and the tip shoe 5, and in the combination of the couplers 9 and 10 used in the first embodiment, an annular protrusion is used. In the unlikely event that the shaft cores of 27 and the locking pieces 25 coincide with each other, the connector 9 of the sampling / radiating tube 11 may come out of the connector 10 of the tip shoe 5. Therefore, in the third embodiment, as shown in FIG. 12 and FIG. 13, the insertion portion 24 is suspended from the base portion 23, and a pair of ends are pivotally supported on the side portion of the insertion portion 24 by pins 34. The connecting tool 9 to which the rod-shaped movable arm members 31 and 31 are attached is used. When the insertion portion 24 passes through the annular protrusion 27, the movable arm member 31 rotates upward and passes through this, but once passes. After that, as shown in FIG. 13, it spreads downward due to its own weight, and stops at a position where its tip comes into contact with the inner wall of the connector 10 having a cylindrical shape.

  In this state, even if a pulling force is applied to the coupling tool 10, the movable arm members 31, 31 are in contact with the inner peripheral wall of the coupling tool 9, and therefore cannot move upward. Separation is reliably prevented.

  Therefore, in the third embodiment, the coupling 9 of the sampling / radiating tube 11 and the coupling 10 of the tip shoe 5 can be easily coupled and can satisfy the conflicting demands of being difficult to come off at the same time. 11 is more stably fixed in the ground 19.

  It can be used in all industrial fields that use geothermal heat as an energy source using a heat pump.

1. Casing 2. 3. Spiral wing Rotating passive metal fittings 4. Rotating gear bracket 5. Tip shoe 6. Bottom plate 7. 8. Excavation blade Connecting tool 10. 10. coupling tool Sampling / radiating tube 18. Pile driver 19. Ground 20. Motor 21. Plate-like blade 22. Pipe line 23. Base 24. Insertion section 25. Locking piece 26. Connecting tool 27. Annular protrusion 30. Pin 31. Movable arm member 32. Collar part 33. Air gap 34. Pin 35. tube

Claims (1)

A casing made of a steel pipe, with a spiral blade for rotation penetration fixed to the outer periphery near the tip, and a rotation transmission fitting fixed to the inner peripheral surface near the tip,
The lower end of a short pipe having an inner diameter slightly larger than the outer diameter of the casing is closed by a disk-shaped bottom plate, and a drilling blade is fixed to the lower surface of the bottom plate, and the upper surface of the casing rotates. A rotary passive metal fitting to be coupled to the transmission metal fitting and a coupling tool to be connected to a fitting attached to the lower end of the sampling / radiating pipe are fixed, and a tip shoe having a plate-like blade fixed to the outer peripheral surface,
A sampling / radiating pipe in which the ends of a pair of long tubes are connected and connected by a connector having a pipe line bent in a U-shape,
Prepare the casing, connect the rotary transmission bracket of the casing and the passive passive bracket of the tip shoe, attach the tip shoe to the tip of the casing, place the casing on the ground with the tip shoe down, and rotate it After applying the force to rotate the tip shoe into the ground to the target depth, insert the sampling / radiating pipe from the upper end opening of the casing toward the lower side of the casing, and connect the connector at the lower end to the tip shoe. After connecting to the connector, the casing is reversely rotated, the casing is pulled out from the ground, and the tip shoe and the sampling / radiating pipe connected to the tip shoe are left in the ground. How to install sampling / radiating tubes.

Images