JP2014214586A - Drilling rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drilling rod by which a heat exchange tube for utilization of underground heat can be easily buried, and a time and labor for discharging sludge generated by drilling to the ground surface and handling the sludge is reduced.SOLUTION: A drilling rod 1 includes a shaft 10 and a head 20 attached to a lower end of the shaft. The head 20 has: a head body 21 which is a cylindrical body with an insertion hole 5 formed; a blowout part 22 for blowing out drilling water; a bottom cover 25 for closing the insertion hole 5; a rammer 24 for ramming the bottom cover 25 to make it withdraw from the head body 21; and a rammer operation part 23 for pushing out the rammer 24 toward the bottom cover 25. The shaft 10 has: a shaft body which is a cylindrical body with the insertion hole 5 formed; a drilling water pipe 12 for supplying drilling water to the blowout part 22; and a cover removing rod 15 extending along the axial direction from an upper end side of the shaft body, and making the rammer operation part 23 move slidingly.

Description

  The present invention relates to a drilling rod, and more specifically, a cylindrical body in which an excavation hole for embedding an underground heat exchange tube in the ground is formed and an insertion hole into which the underground heat exchange tube can be inserted is formed. Relates to a drilling rod.

Conventionally, an excavation hole for embedding an underground heat exchanging tube in the ground is composed of an outer pipe that prevents the collapse of the earth wall in the excavation hole, and an inner pipe that is provided with an excavation blade at the tip. It is excavated by the excavation rod of the heavy pipe.
When this double pipe drilling rod is used, after drilling the drilling hole to a predetermined depth with the double pipe drilling rod, pull out the inner pipe and insert the underground heat exchange tube into the outer pipe, Thereafter, the underground heat exchange tube is buried in the ground by pulling out the outer tube.
However, when a double-pipe excavation rod is used, the process of drawing out the inner pipe takes time, and the construction efficiency is reduced.

Therefore, a drilling pipe has been proposed that rotates while jetting high-pressure drilling water from the pipe end surface toward the drilling surface to form a borehole in the ground (Patent Document 1).
According to this excavation pipe, while excavating the ground with drilling water, the excavated soil is made to rise upward while being mud, and is discharged to form a dredged hole. Then, after excavating the predetermined length, the heat exchanging tube is inserted into the excavating pipe, and then only the excavating pipe is pulled out, so that the heat exchanging tube can be installed in the ground without using a double pipe.

JP2012-127583A

  However, the drilling pipe of Patent Document 1 is filled with drilling water. For this reason, when inserting the heat exchange tube into the excavation pipe, it is necessary to remove the filled excavation water by a drain pump or the like. This excavated water is sludge mixed with excavated soil, and requires a great deal of money and labor to remove and treat.

  An object of the present invention is to provide a drilling rod that can easily embed a heat exchanging tube for use of underground heat and that can reduce sludge generated by excavation to the ground and reduce the time and effort for processing.

(1) A drilling rod which is a cylindrical body in which an excavation hole for burying an underground heat exchange tube is buried and an insertion hole into which the underground heat exchange tube can be inserted is formed. ,
A shaft whose upper end is attached to an excavator for rotating the excavation rod;
A head attached to the lower end of the shaft,
The head is
A head body which is a cylindrical body in which the insertion hole is formed;
An ejection part provided in the head body, for ejecting hole water;
A bottom lid that is provided at a lower end of the head body and closes the insertion hole;
A projecting rod provided on the head main body, slidably moving toward the bottom cover in the axial direction of the head main body, and protruding the bottom cover from the head main body;
A projecting rod operating portion that is provided in the head body, slides along the axial direction of the head body, and pushes the projecting rod toward the bottom cover,
The shaft is
A shaft body which is a cylindrical body in which the insertion hole is formed;
A drilling water pipe provided in the shaft body, extending along an axial direction of the shaft body, and supplying drilling water to the ejection part;
An excavation rod having a lid removing rod provided on the shaft main body, extending from an upper end side of the shaft main body toward the head along an axial direction, and slidingly moving the projecting rod operating portion.

According to the invention of (1), the excavation rod excavates a excavation hole for embedding the underground heat exchange tube in the ground, and a cylinder in which an insertion hole into which the underground heat exchange tube can be inserted is formed. It is a shape body, and is provided with a shaft and a head.
The head is attached to the lower end of the shaft, and has a head main body, an ejection part, a bottom cover, a projecting bar, and a projecting bar operating unit.
The head body is a cylindrical body in which an insertion hole is formed.
The ejection part is provided in the head main body and ejects drilling water.
The bottom cover is provided at the lower end of the head body and closes the insertion hole.
The projecting rod is provided on the head main body, slides toward the bottom lid in the axial direction of the head main body, and pierces the bottom lid to be detached from the head main body.
The projecting rod operating unit is provided in the head main body, slides along the axial direction of the head main body, and pushes the projecting rod toward the bottom cover.
An upper end of the shaft is attached to an excavator that rotates the excavation rod, and includes a shaft main body, a drilled water pipe, and a lid removing rod.
The shaft body is a cylindrical body in which an insertion hole is formed.
The drilling water pipe is provided in the shaft body, extends along the axial direction of the shaft body, and supplies drilling water to the ejection part.
The lid removing rod is provided on the shaft main body, extends from the upper end side of the shaft main body toward the head along the axial direction, and slides the projecting rod operating portion.

According to the excavation rod of the present invention, the underground heat exchange tube is installed in the excavation hole in the following procedure.
First, while rotating the excavating rod by the excavator, the drilling water is supplied from the drilling water pipe of the shaft to the ejection part, and the drilling water is ejected from the ejection part to form a drilling hole having a predetermined depth. At this time, the excavation hole is filled with sludge mixed with drilling water and excavation soil. However, since the insertion hole of the excavation rod is closed by the bottom lid provided at the lower end of the head, a large amount of sludge does not flow into the insertion hole.
For this reason, the underground heat exchange tube is inserted into the insertion hole of the excavation rod without treating the sludge at this stage.

Next, the lid removing rod is moved in the head direction. Then, the projecting rod operating section slides along the axial direction of the head body and pushes the projecting rod toward the bottom cover. The projecting rod slides toward the bottom lid, and pierces the bottom lid to be detached from the head body.
Then, by extracting the excavation rod from the excavation hole, the underground heat exchange tube can be installed in the excavation hole.

Thus, according to the excavation rod of the present invention, sludge generated by excavation of the excavation hole can be prevented from flowing into the insertion hole through which the underground heat exchange tube is inserted.
Therefore, it is possible to provide a drilling rod that can easily embed a heat exchange tube for use of underground heat, and can discharge the sludge generated by excavation to the ground and reduce the labor for processing.

Further, according to the present invention, the bottom lid can be detached from the head body simply by slidingly moving the lid removing rod, the projecting rod operating portion, and the projecting rod. Accordingly, the bottom cover can be detached from the head body with a simple configuration without providing a complicated mechanism such as a hinge, gear, or hydraulic pressure.
Therefore, compared with the case where the projecting rod operating part and projecting rod are operated using a complicated mechanism such as a hinge, gear or hydraulic pressure, there is less possibility of malfunction in the sludge, and the bottom lid is surely detached from the head body. be able to.

(2) The shaft further includes a support portion provided at a predetermined interval along an axial direction of the shaft body on the outer periphery of the shaft body, and supporting the lid removing rod.
The excavating rod according to (1), wherein the lid removing rod is supported by the support portion and extends in a straight line at a position away from a center of the insertion hole by a predetermined distance.

Here, the excavation rod is usually connected with a plurality of excavation rods of a predetermined length. And the upper-lower-end part which is a part which mutually connects a drilling rod has a larger outer diameter compared with an intermediate part.
According to the invention of (2), by providing the support portion, the protruding rod operating portion and the lid removing rod for slidingly moving the protruding rod are arranged in a straight line at the position where the upper and lower ends where the outer diameter is increased. it can.
Thereby, the force applied to the upper end side of the lid removing rod on the ground can be directly transmitted to the projecting rod operating portion and the projecting rod provided on the lower end side of the lid removing rod. In addition, since the support portions that support the lid removing rod are provided at predetermined intervals, it is possible to prevent the lid removing rod from being bent when a force is applied to the upper end side of the lid removing rod.
Therefore, compared with the case where the projecting rod operation unit and projecting rod are operated using a complicated mechanism such as a hinge, gear, hydraulic pressure, etc., the possibility of a malfunction occurring in the sludge is lower, and the bottom cover is more securely attached to the head body. Can be disengaged from.

(3) The drilled water pipe, the ejection portion, the lid removing rod, the projecting rod operation unit, and the projecting rod are each provided in a pair with the center of the insertion hole as a mutual symmetry point,
The lid removing rod, the projecting rod operating portion, and the projecting rod rotate 90 degrees around the center of the insertion hole with respect to the drilled water pipe and the ejection portion as viewed from the axial direction of the insertion hole. The excavation rod according to (1) or (2), which is provided at the position where the excavation is performed.

According to the invention of (3), on the outer periphery of the shaft main body, the drilled water pipe and the lid removing rod can be provided every 90 degrees with the center of the insertion hole as the center point. Further, on the outer periphery of the head main body, the ejection portion, the projecting rod operating unit, and the projecting rod can be provided every 90 degrees with the center of the insertion hole as the center point.
Therefore, the weight balance of the excavation rod is improved, and blurring during rotation of the excavation rod can be suppressed, so that the construction accuracy of the excavation hole is improved.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to embed the heat exchange tube for geothermal heat utilization easily, the excavation rod which can reduce the effort which discharges | emits the sludge generated by excavation on the ground and processes can be provided.

It is a figure explaining the excavation rod which concerns on embodiment of this invention. It is sectional drawing in the AA 'line shown in FIG. It is a figure explaining the head concerning the embodiment. It is sectional drawing which cut | disconnected the head which concerns on the said embodiment by the perpendicular surface. It is the figure which looked at the head concerning the above-mentioned embodiment from the L side shown in FIG. It is a figure explaining operation | movement of the excavation rod which concerns on the said embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals, and the description thereof is omitted or simplified.
Drawing 1 is a figure explaining excavation rod 1 concerning an embodiment of the present invention.
In the following description of the present embodiment, the “upper end” is the U-side end portion shown in FIG. 1, and the “lower end” is the L-side end portion shown in FIG.

The excavation rod 1 is attached to the excavator 100 and excavates an excavation hole for burying the underground heat exchange tube in the ground.
The excavator 100 is an earth auger, and includes a main body (not shown) provided with a power source for driving the excavator 100 and an operation unit on which a pilot rides, and a reader (not shown) vertically supported by the main body. The excavator 110 is supported by the reader so as to be slidable in the vertical direction.
The excavation unit 110 includes a motor that is connected to the upper end of the excavation rod 1 and serves as a drive source for excavating the ground surface, and a speed reducer that transmits the rotational force of the motor to the excavation rod 1 with an appropriate torque.

  The excavation rod 1 is a cylindrical body in which an insertion hole 5 into which an underground heat exchange tube can be inserted is formed, and is attached to a shaft 10 whose upper end is attached to the excavation part 110 of the excavator 100 and to the lower end of the shaft 10. The head 20 is provided.

2 is a cross-sectional view taken along line AA ′ shown in FIG.
As shown in FIGS. 1 and 2, the shaft 10 includes a shaft main body 11 whose upper end is attached to the excavation part 110, a drilled water pipe 12 provided in the shaft main body 11, and a drilled water pipe provided in the shaft main body 11. A drilled water pipe cover 13 that covers 12, a support portion 14 that is attached to the shaft body 11, and a lid removal rod 15 that is provided on the shaft body 11 via the support portion 14.

The shaft body 11 is a cylindrical body that extends on the rotation axis C of the excavating rod 1 and has an insertion hole 5 that is centered on the rotation axis C.
As shown in FIG. 1, the shaft main body 11 is provided on the upper end side, the cross section is formed in a hexagonal shape, the excavator connection part 11 a that engages the excavation part 110 of the excavator 100, and the lower end side, A hole having a hexagonal cross section is formed, and has a head engaging portion 11 b that engages with the head 20.
In the present embodiment, the excavator connection portion 11a is formed in a hexagonal shape, but the shape is not limited thereto, and the excavator connection portion 11a can have any shape or mechanism as long as the shaft 10 can be rotated to the excavation portion 110. You may comprise.

The drilling water pipe 12 extends along the axial direction of the shaft body 11 and supplies drilling water to the ejection portion of the head 20 described later.
As shown in FIG. 1, the drilled water pipe 12 is provided on the upper end side, and is provided on the lower end side with an external hose connection portion 12a to which an external hose for supplying drilled water from the outside is connected via a swivel. And a supply part 12b that is connected to a jet part of the head 20 to be described later and supplies drilling water to the jet part.

  As shown in FIG. 2, the drilled water pipe cover 13 is provided on the outer peripheral surface of the shaft main body 11, is configured with an L-shaped angle, and houses the drilled water pipe 12 between the outer peripheral surface of the shaft main body 11.

A plurality of support portions 14 are provided at predetermined intervals along the axis of the shaft main body 11 (rotation axis C shown in FIG. 1) on the outer periphery of the shaft main body 11 to support the lid removing rod 15.
As shown in FIG. 2, the support portion 14 is formed with a rod hole 14 a through which the lid removing rod 15 is inserted.
The plurality of support portions 14 are provided so that the centers of the rod holes 14 a are arranged in a straight line at a position away from the rotation axis C that is the center of the insertion hole 5 by a predetermined distance.

The lid removing rod 15 is inserted into the rod holes 14a of the plurality of support portions 14 and extends from the upper end side of the shaft body 11 toward the head 20 along the axis (rotation axis C shown in FIG. 1). The projecting rod operating portion of the head 20 to be moved is slid.
As shown in FIG. 1, the lid removing rod 15 is provided on the upper end side, and is provided on the lower end side with an operating portion 15 a to which an external force is applied from above to below (from U side to L side in FIG. 1). And a transmission portion 15b that engages with the projecting rod operation portion of the head 20 and transmits an external force to the projecting rod operation portion.

The operation unit 15a can have an arbitrary structure as long as a force from the top to the bottom is applied. For example, the operation unit 15a may include a receiving unit that is hit by a hammer that is dropped from above.
Further, the operation portion 15a may be configured by a fixing portion that is fixed to the shaft body 11 and has a screw hole, and a bolt that is screwed to the fixing portion. In this case, by tightening the bolt with an impact wrench or the like, a force directed downward from above is applied to the lid removing rod 15.

Moreover, you may comprise the rod 15 for lid | cover removal with a sheath tube and the core tube penetrated in this sheath tube. In this case, the sheath tube is fixed to the support portion 14, and the core tube slides inside the sheath tube to transmit the external force received by the operation portion 15 a to the head 20.
According to this configuration, the core tube that transmits the external force to the head 20 can be protected from sludge and the like by the sheath tube, and can be restrained in the axial direction and prevented from being bent, so that the external force is transmitted to the head 20 more reliably. Can do.

Further, as shown in FIG. 2, in the shaft 10, the drilled water pipe 12, the drilled water pipe cover 13, the plurality of support portions 14 arranged in a straight line, and the lid removing rod 15 are respectively arranged in the center of the insertion hole 5. (A rotation axis C shown in FIG. 2) is provided as a pair having symmetry points with each other.
The plurality of support portions 14 and the lid removing rod 15 arranged in a straight line are located at the center of the insertion hole 5 with respect to the drilled water pipe 12 and the drilled water pipe cover 13 when viewed from the axial direction of the insertion hole 5. The center point is provided at a position rotated 90 degrees.

FIG. 3 is a diagram illustrating the head 20 according to the embodiment.
The head 20 includes a head main body 21 that engages with the shaft main body 11, a jet part 22 that is provided in the head main body 21 and to which the drilled water pipe 12 is connected, and is provided in the head main body 21 and is engaged with the lid removing rod 15. And a projecting rod 24 connected to the projecting rod operating unit 23, a bottom cover 25 provided at the lower end of the head main body 21, and a digging blade 26 provided on the head main body 21. .

The head body 21 is a cylindrical body that extends on the rotation axis C of the excavating rod 1 and has an insertion hole 5 that is centered on the rotation axis C.
The head main body 21 is provided on the upper end side, has a cross section formed in a hexagonal shape, and has a shaft engaging portion 21 a that engages with the head engaging portion 11 b of the shaft main body 11.
In the present embodiment, the head engaging portion 11b and the shaft engaging portion 21a are formed in a hexagonal shape, and the shaft 10 and the head 20 are engaged. As long as the head 20 follows the rotation of the shaft 10, the configuration to be combined may be configured in any shape or mechanism.

FIG. 4 is a cross-sectional view of the head 20 according to the embodiment cut along a vertical plane.
As shown in FIG. 4, the head main body 21 includes a groove 211 that extends in the axial direction and engages and slides with the projecting rod operation unit 23, a projecting rod insertion hole 212 into which the projecting rod 24 is inserted and moved, Is formed.

Returning to FIG. 3, the ejection portion 22 extends along the axial direction of the head body 21, and ejects drilling water from the lower end of the head body 21.
The ejection part 22 is provided on the upper end side, is connected to the supply part 12 b of the drilling water pipe 12, and receives a supply part 22 a that receives the supply of drilling water from the drilling water pipe 12, and is provided at the lower end of the head body 21. A water outlet 22b that ejects water, and a water supply part 22c in which a pipe that supplies the drilled water from the receiving part 22a to the water outlet 22b is protected by a cover.

The projecting rod operating unit 23 slides along the axial direction of the head main body 21 and pushes the projecting rod 24 toward the bottom cover 25.
As shown in FIG. 4, the projecting rod operation unit 23 is inserted into the rod lower end support member 231 provided with the rod insertion hole 231 a provided on the outer peripheral surface of the head main body 21, and the rod insertion hole 231 a of the rod lower end support member 231. The relay member 232 in which the upper end portion is inserted, and the connecting member 233 that connects the relay member 232 and the projecting rod 24 are provided.

The rod lower end support member 231 engages with the transmission portion 15 b of the lid removing rod 15.
The lower end portion of the lid removing rod 15 is inserted into the rod insertion hole 231a from above (U side in FIG. 4), and the upper end portion of the relay member 232 is inserted from below (L side in FIG. 4). That is, the lid removing rod 15 and the relay member 232 are engaged in the rod insertion hole 231a.

The relay member 232 is a rod-like body and extends downward (L side in FIG. 4) along the axial direction of the head body 21.
The connecting member 233 has the upper end connected to the lower end of the relay member 232, the side edge engaged with the groove 211 of the head body 21, and the lower end connected to the upper end of the projecting rod 24. When the connecting member 233 is pressed by the relay member 232, the connecting member 233 slides downward (L side in FIG. 4) along the groove 211 and pushes the protruding rod 24 toward the bottom cover 25.

  The projecting rod 24 is inserted into the projecting rod insertion hole 212 of the head body 21, slides toward the bottom cover 25 in the axial direction of the head body 21, and projects the bottom cover 25 from the head body 21.

FIG. 5 is a view of the head 20 according to the embodiment as viewed from the L side shown in FIG.
As shown in FIG. 5, the bottom cover 25 is a circular plate-like body, is provided on the lower end surface of the head body 21, and closes the insertion hole 5 and the projecting rod insertion hole 212.
Further, the bottom cover 25 is formed with a notch 25a at a portion where the jet port 22b of the jet part 22 is disposed.
For example, the bottom lid 25 is scored at several points on the lower end surface of the head main body 21 by welding. However, the bottom lid 25 is not limited to this, and does not fall due to vibration during excavation and the head main body 21 when it is struck by the projecting rod 24. As long as it can be detached from the device, it may be fixed by any method.

  Returning to FIG. 3, the excavation blade 26 is formed in a spiral shape on the outer peripheral surface on the lower end side of the head body 21.

Further, in the head 20, the ejection portion 22, the projecting rod operation unit 23, and the projecting rod 24 are each provided in a pair with the center of the insertion hole 5 (the rotation axis C shown in FIG. 3) as a symmetry point. Yes.
The projecting rod operating portion 23 and the projecting rod 24 are provided at a position rotated 90 degrees with respect to the ejection portion 22 with the center of the insertion hole 5 as a center point, as viewed from the axial direction of the insertion hole 5.

Next, a procedure for installing the underground heat exchange tube in the excavation hole using the excavation rod 1 according to the present embodiment will be described.
FIG. 6 is a diagram for explaining the operation of the excavation rod 1 according to the embodiment.
First, while rotating the excavating rod 1 with an excavator, the drilling water is supplied from the drilling water pipe 12 of the shaft 10 to the ejection portion 22, and the drilling water is ejected from the ejection port 22 b of the ejection portion 22. The excavation hole 200 is formed. At this time, the excavation hole 200 is filled with sludge mixed with drilling water and excavation soil. However, since the insertion hole 5 of the excavation rod 1 is closed by the bottom cover 25 (the bottom cover 25 shown by a dotted line in FIG. 6) provided at the lower end of the head 20, a large amount of sludge is contained in the insertion hole 5. There is no inflow.
For this reason, the underground heat exchange tube 2 is inserted into the insertion hole 5 of the excavation rod 1 without treating sludge at this stage.

Next, the lid removing rod 15 is moved toward the head 20. Then, the projecting rod operating unit 23 slides along the axial direction of the head main body 21 and pushes the projecting rod 24 toward the bottom cover 25. The projecting rod 24 slides toward the bottom lid 25, and projects the bottom lid 25 from the head main body 21 (the bottom lid 25 shown by a solid line in FIG. 6).
And the underground heat exchange tube 2 can be installed in the excavation hole 200 by leaving the underground heat exchange tube 2 in the excavation hole 200 and pulling out the excavation rod 1 from the excavation hole 200.

Thus, according to the excavation rod 1 of the present embodiment, sludge generated by excavation of the excavation hole 200 can be prevented from flowing into the insertion hole 5 through which the underground heat exchange tube 2 is inserted.
Therefore, it is possible to provide a drilling rod that can easily embed a heat exchange tube for use of underground heat, and can discharge the sludge generated by excavation to the ground and reduce the labor for processing.

Further, according to the excavation rod 1 of the present embodiment, the bottom lid 25 can be detached from the head main body 21 simply by slidingly moving the lid removing rod 15, the projecting rod operating portion 23 and the projecting rod 24. As a result, the bottom cover 25 can be detached from the head body 21 with a simple configuration without providing a complicated mechanism such as a hinge, gear, or hydraulic pressure.
Therefore, compared with the case where the projecting rod operating portion 23 and projecting rod 24 are operated using a complicated mechanism such as a hinge, gear, hydraulic pressure, etc., there is less possibility of malfunction in sludge, and the bottom cover 25 is securely attached to the head body. 21 can be removed.

Further, according to the excavation rod 1 of the present embodiment, by providing the support portion 14, the projecting rod operation unit 23 and the projecting rod 24 are slid at positions where the upper and lower end portions where the outer diameter increases in the shaft body 11 are displaced. The moving lid removing rod 15 can be arranged in a straight line.
Thereby, the force applied to the upper end side of the lid removing rod 15 on the ground can be directly transmitted to the projecting rod operating portion 23 and the projecting rod 24 provided on the lower end side of the lid removing rod 15. Further, since the support portions 14 that support the lid removing rod 15 are provided at predetermined intervals, it is possible to prevent the lid removing rod 15 from being bent when a force is applied to the upper end side of the lid removing rod 15.
Therefore, compared with the case where the projecting rod operation unit 23 and the projecting rod 24 are operated using a complicated mechanism such as a hinge, gear, hydraulic pressure, etc., the possibility of malfunction occurring in the sludge is further reduced, and the bottom cover 25 is more reliably secured. Can be detached from the head body 21.

Further, according to the excavating rod 1 of the present embodiment, the drilled water pipe 12 and the lid removing rod 15 can be provided on the outer periphery of the shaft body 11 every 90 degrees with the center of the insertion hole 5 as the center point. Further, on the outer periphery of the head main body 21, the ejection portion 22, the projecting rod operating portion 23 and the projecting rod 24 can be provided every 90 degrees with the center of the insertion hole 5 as the center point.
Therefore, the weight balance of the excavation rod 1 is improved, and blurring during rotation of the excavation rod 1 can be suppressed, so that the construction accuracy of the excavation hole 200 is improved.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

DESCRIPTION OF SYMBOLS 1 Excavation rod 2 Underground heat exchange tube 5 Insertion hole 10 Shaft 11 Shaft main body 12 Drilling water pipe 15 Lid for rod removal 20 Head 21 Head main body 22 Ejection part 23 Protrusion stick operation part 24 Protrusion stick 25 Bottom cover 100 Excavator 200 Drilling hole

Claims (3)

A drilling rod that is a cylindrical body in which an excavation hole for burying the underground heat exchange tube in the ground is formed, and an insertion hole into which the underground heat exchange tube can be inserted is formed,
A shaft whose upper end is attached to an excavator for rotating the excavation rod;
A head attached to the lower end of the shaft,
The head is
A head body which is a cylindrical body in which the insertion hole is formed;
An ejection part provided in the head body, for ejecting hole water;
A bottom lid that is provided at a lower end of the head body and closes the insertion hole;
A projecting rod provided on the head main body, slidably moving toward the bottom cover in the axial direction of the head main body, and protruding the bottom cover from the head main body;
A projecting rod operating portion that is provided in the head body, slides along the axial direction of the head body, and pushes the projecting rod toward the bottom cover,
The shaft is
A shaft body which is a cylindrical body in which the insertion hole is formed;
A drilling water pipe provided in the shaft body, extending along an axial direction of the shaft body, and supplying drilling water to the ejection part;
An excavation rod having a lid removing rod provided on the shaft main body, extending from an upper end side of the shaft main body toward the head along an axial direction, and slidingly moving the projecting rod operating portion. The shaft further includes a support portion that is provided at a predetermined interval along the axial direction of the shaft main body on the outer periphery of the shaft main body, and supports the lid removing rod.
The excavation rod according to claim 1, wherein the lid removing rod is supported by the support portion and extends in a straight line at a position away from a center of the insertion hole by a predetermined distance. The drilling water pipe, the ejection part, the lid removing rod, the projecting rod operating unit, and the projecting bar are each provided in a pair with the center of the insertion hole as a mutual symmetry point,
The lid removing rod, the projecting rod operating portion, and the projecting rod rotate 90 degrees around the center of the insertion hole with respect to the drilled water pipe and the ejection portion as viewed from the axial direction of the insertion hole. The excavation rod according to claim 1 or 2, wherein the excavation rod is provided at a position where the excavation is performed.

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