JP2014218825A - Heat collection and radiation pile and construction method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat collection and radiation pile which can be easily constructed and has efficient heat exchange efficiency and to provide a construction method for the same.SOLUTION: A heat collection and radiation pile 1 comprises: a hollow pile body 2; an inner pipe 3 arranged inside a hollow section of the pile body 2; and a heat exchange pipe 4 which is arranged inside the hollow section of the inner pipe 3. In the heat collection and radiation pile 1 and a construction method for the same, the pile body 2 is made by longitudinally connecting a plurality of pile members 21, 22 and 23; the inner pile 3 is made by longitudinally connecting a plurality of pipe members 31 and 32; and the pipe members 31 and 32 are arranged in the center of cross-sections of the pile members 21 and 22 in a state independent thereof.

Description

  The present invention relates to a heat-dissipating heat-dissipating pile and a method for constructing the pile.

The geothermal heat exchanger effectively uses geothermal heat, which is less affected by the season and weather and has a stable temperature throughout the year.
The underground heat exchanger performs heat collection or heat radiation by piping a heat exchange pipe in the ground and circulating a refrigerant (water or the like) in the heat exchange pipe.

As a method of piping the heat exchanging pipe into the ground, there is a case of piping inside the pile.
The piping method of the heat exchange pipe to the inside of the pile is to form a pile hole for laying the pile, fill the cement hole with the cement milk, arrange a hollow ready-made pile, This was done by inserting a heat exchange tube before the cement milk that had entered (filled) the hollow portion solidified.

  However, the conventional piping method needs to carry out the pile work and the pipe work at the same time, and the work is complicated. In addition, the waiting time for the pile construction worker and the piping construction worker becomes long, which hinders the reduction of the construction cost.

  In addition, the piping work needs to be performed with high quality within the time constraint that it is necessary to finish the cement milk before it is solidified, which requires advanced technology.

Therefore, Patent Document 1 discloses a pile in which an outer tube for underground heat exchange is installed along the pile axis on the inner surface of a ready-made pile. This underground heat exchange outer tube is fixed to the inner surface of the ready-made pile via a jig.
According to the pile with the outer pipe for underground heat exchange in Patent Document 1, it becomes possible to perform the pile work and the pipe work separately, and it is not necessary to perform the pipe work under time constraints. Construction can be performed easily.

JP 2006-52588 A

  Since the pile described in Patent Document 1 is piped in a state in which the outer pipe for underground heat exchange is in contact with the inner surface of the ready-made pile, there is a temperature difference between the portion in contact with the ready-made pile and the other portions. May occur and efficient heat exchange may not be possible.

  Moreover, when joining the pile members which comprise a ready-made pile, it is necessary to work so that an outer pipe | tube for underground heat exchange may not be damaged by the heat of welding, and it takes an effort.

  From such a viewpoint, this invention makes it a subject to propose the construction method of the heat-dissipating heat-dissipating pile and a pile which can be constructed | assembled easily and has good heat exchange efficiency.

  In order to solve the above-mentioned problems, the present invention provides a heat-collecting / pile-collecting pile comprising a hollow pile body, an inner pipe piped in the inner space of the pile body, and a heat exchange pipe piped in the inner space of the inner pipe. The pile body is formed by vertically connecting a plurality of pile members, the inner pipe is formed by vertically connecting a plurality of tube members, and the tube member is formed by connecting the pile members to each other. It is characterized by being piped in a state independent of the pile member at the center of the cross section of the member.

According to this heat-dissipating pile, since the heat exchange pipe is piped in the center part of the pile main body, the efficiency of heat exchange is good. Further, even when the pile members are joined together by welding, it is unlikely that heat during welding will affect the inner pipe.
Since a heat exchange pipe should just be inserted in the inside of the inner pipe arrange | positioned inside the pile main body, piping work can be performed after pile construction is complete | finished. Therefore, it is excellent in workability.

  A locking member is provided in the inner space of the lower end of the pile member, and a protruding member having a protruding length larger than the gap between the outer peripheral surface of the tube member and the locking member is provided on the outer peripheral surface of the pipe member. When the pile member is lifted, the lower end portion of the pipe member protrudes downward from the lower end of the pile member, and the protruding member is locked to the locking member. If it does, joining of pipe members can be performed simply.

  In addition, if the spacer protrudes from the outer peripheral surface of the pipe member, it is easy to position the inner pipe.

  The pile construction method of the present invention includes a drilling process for drilling a pile hole for building a pile, a pile building process for building a pile in the pile hole, and heat exchange in the inner space of the pile. A pile construction method comprising a piping step of piping a pipe, wherein in the pile erection step, a plurality of hollow pile members are connected to each other in the vertical direction to form a pile body, and the pile members An inner pipe is formed in the inner space of the pile body by connecting a plurality of pipe members arranged in advance in the center of the cross section, and in the piping step, the heat exchange pipe is inserted into the inner pipe. It is a feature.

According to this pile construction method, since the inner pipe is piped to the center of the cross section of the pile body, the pipe of the heat exchange pipe can be used as the center of the pile body. Therefore, it is possible to easily configure a heat-dissipating and heat-dissipating pile with good heat exchange efficiency.
The heat exchanging pipe is excellent in workability because it can be performed after the pile work is completed. Moreover, since there is no time restriction in the piping work of the heat exchange pipe, the workability is more excellent.

  A locking member is provided in the inner space of the lower end of the pile member, and a protruding member having a protruding length larger than the gap between the outer peripheral surface of the pipe member and the locking member is provided on the outer peripheral surface of the pipe member. In the pile building process, the pile member is lifted, and the lower end of the upper pipe member disposed in the inner space of the pile member protrudes below the lower end of the pile member. And the upper pipe member is connected to the lower pipe member disposed in the inner space of the existing pile member in a state where the protruding member is locked to the locking member, and then the pile What is necessary is just to drop a member and to connect the said pile member to the said existing pile member.

  According to the heat-dissipating and heat-dissipating pile and the pile construction method of the present invention, a heat-dissipating and heat-dissipating pile with good heat exchange efficiency can be easily constructed.

It is sectional drawing which shows the heat-dissipating / discharging pile which concerns on embodiment of this invention. It is sectional drawing of the pile member which comprises a part of heat-collecting heat radiation pile. (A) is a top view which shows the upper end of a 1st pile member, (b) is sectional drawing of the same upper end part. (A) is sectional drawing which shows the lower end part of a 1st pile member, (b) is an AA arrow directional view of (a). (A) is a top view which shows the upper end of a 2nd pile member, (b) is sectional drawing of the same upper end part. (A) is sectional drawing which shows the lower end part of a 2nd pile member, (b) is a BB arrow line view of (a). (A) And (b) is sectional drawing which shows the construction condition of the heat-dissipating pile. (A)-(c) is sectional drawing which shows the joining procedure of pipe members and pile members.

  As shown in FIG. 1, a heat-dissipating pile 1 according to an embodiment of the present invention is a hollow pile body 2, an inner pipe 3 piped in the interior of the pile body 2, and a pipe in the interior of the inner pipe 3. The heat exchange pipe 4 is provided, and a root hardening part 5 formed at the lower end part of the pile body 2 is provided.

The pile body 2 of this embodiment is formed by vertically connecting the first pile member 21, the second pile member 22, and the third pile member 23.
The pile members 21, 22, and 23 are made of a tubular precast concrete member.

  The three pile members 21, 22, and 23 used in the present embodiment have the same cross-sectional shape. Each pile member 20 does not necessarily have the same shape. Moreover, the number of the pile members which comprise the pile main body 2 is not limited.

The first pile member 21 is a pile member disposed on the top of the pile body 2. Note that a plurality of the first pile members 21 may be provided in series according to the total length of the heat-dissipating pile 1 (pipe of the heat exchange pipe 4).
As shown in FIG. 2, a first pipe member 31 constituting a part of the inner pipe 3 is disposed in the inner space of the first pile member 21.

  The hollow portion of the first pile member 21 has a sufficiently large diameter (inner diameter) with respect to the outer diameter of the first pipe member 31.

  The connection ring 6 is integrally fixed to the upper end surface and the lower end surface of the first pile member 21, respectively. The connection ring 6 is made of a steel plate, but the material constituting the connection ring 6 is not limited.

  The head ring 61 that is the connection ring 6 fixed to the upper end surface of the first pile member 21 has the same shape as the cross-sectional shape of the first pile member 21 as shown in FIGS. An annular portion 61a and four flange portions 61b extending from the annular portion 61a toward the center are configured. The number of flange portions 61b is not limited.

A pile mouth pipe 62 is fixed to the inner side of the head ring 61 (the tip of the flange portion 61b).
The pile mouth pipe 62 is made of a steel pipe having an inner diameter larger than the outer diameter of the inner pipe 3, and is welded to the tip of the flange portion 61 b of the head ring 61. In addition, you may provide a rib in the junction part of the flange part 61b and the pile mouth pipe | tube 62. FIG.

The pile mouth pipe 62 of this embodiment has a length of about 500 mm.
The material of the pile mouth pipe 62 is not limited. Further, the length of the pile mouth pipe 62 is not limited. Further, the wellhead pipe 62 may be installed as necessary and may be omitted.

  The leg ring 63 that is the connection ring 6 fixed to the lower end surface of the first pile member 21 has the same shape as the cross-sectional shape of the first pile member 21 as shown in FIGS. An annular portion 63a and four flange portions 63b extending from the annular portion 63a toward the center are configured. The number of flange portions 63b is not limited.

A locking tube 64 (locking member) is fixed to the inside of the leg ring 63 (the tip of the flange portion 63b).
The locking pipe 64 is made of a steel pipe having an inner diameter larger than the outer diameter of the inner pipe 3, and is welded to the tip of the flange portion 63b of the leg ring 63.
That is, the locking pipe 64 is provided in the inner space at the lower end of the first pile member 21 and is supported by the first pile member 21 via the leg ring 63.

A rib 65 is provided at the joint between the flange portion 63 b and the locking tube 64.
The rib 65 is a steel plate erected at a corner formed by the flange portion 63 b and the locking tube 64, and is welded to the upper surface of the leg ring 63 and the outer peripheral surface of the locking tube 64. In addition, what is necessary is just to provide the rib 65 as needed.

The locking tube 64 of this embodiment has a length of about 50 mm.
The material and length of the locking tube 64 are not limited.

As shown in FIG. 1, the second pile member 22 is an intermediate portion of the pile body 2 and is a pile member disposed between the first pile member 21 and the third pile member 23.
A second pipe member 32 constituting a part of the inner pipe 3 is disposed in the inner space of the second pile member 22.

  The hollow portion of the second pile member 22 has a sufficient diameter (inner diameter) with respect to the outer diameter of the second pipe member 32.

  As shown in FIGS. 5 and 6, connection rings are integrally fixed to the upper end surface and the lower end surface of the second pile member 22, respectively. The connection ring is made of a steel plate, but the material of the connection ring is not limited.

  Since the structure of the upper end ring 66 that is a connection ring fixed to the upper end surface of the second pile member 22 is the same as the head ring 61 fixed to the upper end surface of the first pile member 21, detailed description thereof is omitted. .

  As shown in FIGS. 5A and 5B, a pile mouth pipe 62 is fixed to the inner side of the upper end ring 66 (the front end of the flange portion 66b). The pile mouth pipe 62 is made of a steel pipe having an inner diameter larger than the outer diameter of the inner pipe 3, and is fixed by welding to the tip of the flange portion 66 b of the upper end ring 66.

As shown in FIGS. 6A and 6B, the bottom ring 67 which is a connection ring fixed to the lower end surface of the present dismantling is an annular portion 67 a having the same shape as the cross-sectional shape of the second pile member 22. The second pipe member 32 has a disc portion 67b having a size larger than the outer shape, and four flange portions 67c that connect the annular portion 67a and the disc portion 67b.
That is, the opening at the lower end of the second pipe member 32 is shielded by the bottom ring 67 (disk portion 67b).

A rib 65 is provided at the joint between the bottom ring 67 and the second pipe member 32.
The rib 65 is a steel plate erected at a corner portion formed by the second pile member 22 and the flange portion 67 c and is welded to the upper surface of the bottom ring 67 and the outer peripheral surface of the second pipe member 32. The rib 65 may be provided as necessary and may be omitted.

The 3rd pile member 23 is a pile member arrange | positioned in the lower part of the pile main body 2, as shown in FIG.
A connection ring formed of a steel plate is integrally fixed to the upper end surface of the third pile member 23. The material of the connection ring is not limited.

An upper end ring 68 that is a connection ring fixed to the upper end surface of the third pile member 23 has an annular shape so as to have the same shape as the cross-sectional shape of the third pile member 23.
In addition, the 3rd pile member 23 may fix a lower end ring to a lower end surface as needed.

The lower end portion of the third pile member 23 is inserted into the root hardening portion 5.
The root hardening part 5 is comprised by inject | pouring a solidification material into the bottom part of the drilling hole formed when forming the pile main body 2, and fixes the lower end of the pile main body 2. As shown in FIG.
In addition, what is necessary is just to form the root hardening part 5 as needed.

  The inner pipe 3 is formed by vertically connecting a first pipe member 31 housed in the first pile member 21 and a second pipe member 32 housed in the second pile member 22.

  The 1st pipe member 31 comprises the upper part of the inner pipe 3, and as shown in FIG. 2, it is piped in the cross-sectional center part of the 1st pile member 21 in the state independent of the 1st pile member 21. .

  Four projecting members 33 project from the outer peripheral surface of the first pipe member 31. The four protruding members 33 are arranged on the outer peripheral surface of the first pipe member 31 at equal intervals in the circumferential direction (see FIG. 4B).

The protruding member 33 is made of a rectangular plate material, and has a protruding length larger than the distance from the outer peripheral surface of the first tube member 31 to the outer peripheral surface of the locking tube 64.
The protruding length of the protruding member 33 is not limited, but is at least larger than the gap between the outer peripheral surface of the first tube member 31 and the locking tube 64. In other words, the protruding member 33 is formed in a size to be locked to the locking tube 64. Further, the number of protruding members 33 is not limited.

  In the present embodiment, the distance from the lower end surface of the first pipe member 31 to the lower end surface of the protruding member 33 is made equal to the length of the pile port pipe 62. In addition, the distance from the lower end surface of the 1st pipe member 31 to the lower end surface of the protrusion member 33 is not limited, What is necessary is just to set suitably.

Further, four spacers 34 project from the outer peripheral surface of the first pipe member 31. The four spacers 34 are arranged on the outer peripheral surface of the first pipe member 31 at equal intervals in the circumferential direction.
The spacer 34 is disposed in the middle of the first pipe member 31 in the height direction, and has a protruding length that is the same as the gap between the first pipe member 31 and the first pile member 21.

The spacer 34 of the present embodiment is configured by a flat plate 34 a and ribs 34 b erected at corners of the lower surface of the flat plate 34 a and the outer surface of the first tube member 31.
The configuration, arrangement, and number of the spacers 34 are not limited. For example, when the first pipe member 31 is long, a plurality of stages may be arranged.

  As shown in FIG. 1, the second pipe member 32 constitutes the lower part of the inner pipe 3, and is piped at the center of the cross section of the second pile member 22.

As shown in FIGS. 5A and 5B, a connecting pipe 35 is attached to the upper end of the second pipe member 32.
The connecting pipe 35 is a member that connects the first pipe member 31 and the second pipe member 32.

  The connecting pipe 35 is configured by a steel pipe having an inner diameter equivalent to the outer diameter of the first pipe member 31 and the second pipe member 32 and having an outer diameter smaller than the inner diameter of the pile port pipe 62. .

The lower end of the first pipe member 31 is inserted into the upper half of the connecting pipe 35.
The lower half part of the connection pipe 35 is extrapolated to the upper end part of the 2nd pipe member 32, and is being fixed to the 2nd pipe member 32 by welding.

  As shown in FIGS. 6A and 6B, the lower end of the second pipe member 32 is fixed to the bottom ring 67 of the second pile member 22.

  As shown in FIG. 1, a spacer 34 protrudes from the outer peripheral surface of the second pipe member 32. In the present embodiment, four spacers 34 are provided on the outer peripheral surface of the second pipe member 32 at regular intervals in the circumferential direction.

The heat exchange pipe 4 circulates a refrigerant or the like inside, thereby performing heat radiation using the underground heat.
The heat exchange pipe 4 is inserted into the inner space of the inner pipe 3 from the upper end toward the lower end. After reaching the bottom of the inner tube 3, the heat exchange tube 4 is configured by a U tube that is piped so as to extend toward the upper end of the inner tube 3 again. The material of the U tube that constitutes the heat exchange tube 4 is not limited as long as it has excellent heat dissipation or heat collecting properties. For example, a polyethylene tube, a vinyl chloride tube, a steel tube, a stainless tube, or the like may be used. .

Next, the construction method of the heat-radiating / dissipating pile 1 will be described.
The construction method of the heat-dissipating pile 1 includes a drilling process, a pile building process, and a piping process.

The drilling step is a step of drilling the ground and forming a pile hole H for installing the heat-dissipating pile 1 as shown in FIG.
In this embodiment, the pile hole H is formed vertically, but the pile hole H is not necessarily vertical.

Kuiana H, in order to suppress the collapse of Anakabe H _W, performed in a state of being filled with the stabilizing liquid inside boring.
When the pile hole H having a predetermined depth is formed, a root hardening liquid 51 made of a solidifying material is poured into the bottom of the pile hole H. In addition, although the material which comprises a root hardening liquid is not limited, Cement milk is employ | adopted in this embodiment. The stabilizing liquid in the pile hole H is replaced with a pile circumference fixing liquid (cement milk or the like).

  The pile building process is a process of building a pile in the pile hole H formed in the drilling process, as shown in FIG.

In the pile building step, the pile main body 2 is formed by inserting a plurality of hollow pile members 21, 22, 23 into the pile hole H and connecting the pile members 21, 22, 23 in the vertical direction.
The construction of the pile body 2 needs to be performed before the root hardening liquid 51 and the pile periphery fixing liquid are cured.

  In addition, as the pile members 21, 22, 23 are connected to each other, the pipe members 31, 32 arranged in advance in the center of the cross section of the pile members 21, 22 are connected to each other to connect the inner pipe to the inner space of the pile body 2. 3 is formed.

  In the pile building process, first, the third pile member 23 is inserted into the pile hole H. At this time, the third pile member 23 is stopped in a state where its head protrudes from the pile hole H.

Next, the second pile member 22 is suspended from above the third pile member 23 and connected to each other with the lower end of the second pile member 22 and the upper end of the third pile member 23 butted together.
The connection between the second pile member 22 and the third pile member 23 is performed by welding the bottom ring 67 of the second pile member 22 and the upper end ring 68 of the third pile member 23. In addition, the connection method of the 2nd pile member 22 and the 3rd pile member 23 is not limited.

  If the 2nd pile member 22 and the 3rd pile member 23 are connected, both the pile members 22 and 23 will be inserted in the pile hole H. When only the head of the second pile member 22 protrudes from the pile hole H, the descent of the pile members 22 and 23 is stopped.

  Next, as shown in FIG. 8A, the first pile member 21 is suspended from above the second pile member 22. At this time, the lower end portion of the first pipe member 31 protrudes downward from the lower end of the first pile member 21 in a state where the protruding member 33 is locked to the locking pipe 64.

And by lowering the 1st pile member 21 further, as shown in FIG.8 (b), the lower end of the 1st pipe member 31 is inserted in the connection pipe 35 attached to the upper end of the 2nd pipe member 32. FIG. And the 1st pipe member 31 and the 2nd pipe member 32 are connected by welding the 1st pipe member 31 and the connection pipe 35, and the inner pipe 3 is formed.
When the inner tube 3 is formed, the upper end of the inner tube 3 is covered.

  If the 1st pipe member 31 and the 2nd pipe member 32 are connected, the 1st pile member 21 will be dropped, and as shown in (c) of Drawing 8, end faces of the 1st pile member 21 and the 2nd pile member 22 Match. And the 1st pile member 21 and the 2nd pile member 22 are connected by welding the leg part ring 63 and the upper end ring 66, and the pile main body 2 is formed.

  When the pile main body 2 is formed, the pile main body 2 is further pushed into the pile hole H and the lower end portion is press-fitted into the rooted portion 5 as shown in FIG.

  In addition, with the construction of the pile main body 2 and the inner pipe 3, the gap between the pile main body 2 and the inner pipe 3 is filled with cement milk (root-setting liquid 51 and pile periphery fixing liquid) that has entered from the lower end of the pile.

A piping process is a process of piping the heat exchange pipe 4 in the inner space of a pile.
When the construction of the pile (pile main body 2 and inner pipe 3) is completed, the heat exchange pipe 4 is inserted into the inner pipe 3 as shown in FIG.
The gap between the inner pipe 3 and the heat exchange pipe 4 is filled with water, sand, or the like in order to improve the heat exchange efficiency.

As mentioned above, according to the heat-dissipating pile 1 of this embodiment, since the heat exchange pipe 4 is piped by the center part of the pile main body 2 via the inner pipe 3, the efficiency of heat exchange is good.
Moreover, since the clearance gap is formed between the pile main body 2 and an inner pipe, the possibility that the heat at the time of welding the pile members 21, 22, and 23 will affect the inner pipe 3 is low.

  Since heat exchange pipe 4 should just be inserted in the inside of inner pipe 3 arranged inside pile body 2, piping work can be performed after pile construction is completed. Therefore, it is excellent in workability.

Since joining of the pipe members 31 and 32 is performed in a state in which the lower end of the first pipe member 31 protrudes downward from the lower end of the first pile member 21, the construction is easy.
Since the 1st pipe member 31 is independent of the 1st pile member 21, only the first pile member 21 is lifted, and the lower end part of the 1st pipe member 31 protrudes from the lower end of the 1st pile member 21, and an inner pipe After the formation of 3, only the first pile member 21 can be lowered.

  Since the projecting member 33 of the first pipe member 31 is locked to the locking pipe 64 of the first pile member 21, the first pipe member 31 does not fall when the first pile member 21 is lifted.

  Moreover, since the spacer 34 protrudes from the outer peripheral surface of the pipe members 31 and 32, the position of the inner pipe 3 is prevented from deviating from the center of the cross section of the pile body 2.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.

  For example, in the said embodiment, although each pile member which comprises a pile main body demonstrated the case where it was comprised with the precast concrete member, the material which comprises a pile member is not limited, For example, it is a steel pipe. Also good.

In the said embodiment, although the latching member was comprised by the cyclic | annular member, the shape of a latching member is not limited.
Further, the spacer may be disposed as necessary and may be omitted.

  In the said embodiment, although the stabilizing liquid in a pile hole shall be replaced with cement milk before a pile erection process, you may inject | pour cement milk (solidification material) after a pile erection process.

DESCRIPTION OF SYMBOLS 1 Heat collection pile 2 Pile main body 21 1st pile member 22 2nd pile member 23 3rd pile member 3 Inner pipe 31 1st pipe member 32 2nd pipe member 33 Protruding member 34 Spacer 4 Heat exchange pipe 64 Locking pipe (engagement) Stopping member)

Claims (4)

A heat-collecting and heat-dissipating pile comprising a hollow pile body, an inner pipe piped in the inner space of the pile body, and a heat exchange pipe piped in the inner space of the inner pipe,
The pile body is formed by vertically connecting a plurality of pile members,
The inner pipe is formed by vertically connecting a plurality of pipe members,
The pipe member is piped in a central portion of the cross section of the pile member in a state independent of the pile member. In the inner space at the lower end of the pile member, a locking member supported by the pile member is provided,
On the outer peripheral surface of the tube member, a projecting member having a protruding length larger than the gap between the outer peripheral surface of the tube member and the locking member is projected.
The lower end of the pipe member protrudes downward from the lower end of the pile member when the pile member is lifted, and the protruding member is locked to the locking member. A heat-dissipating pile as described in 1. Drilling process for drilling pile holes for building piles;
A pile building process for building a pile in the pile hole;
A piping process for piping a heat exchange pipe to the inside of the pile, and a pile construction method comprising:
In the pile building step, a plurality of hollow pile members are connected in the vertical direction to form a pile main body, and a plurality of pipe members previously disposed in the center of the cross section of the pile member are connected to each other. By forming an inner tube in the interior of the pile body,
In the piping process, the heat exchange pipe is inserted into the inner pipe. A locking member supported by the pile member is provided in the inner space of the lower end of the pile member, and a gap between the outer peripheral surface of the pipe member and the locking member is provided on the outer peripheral surface of the pipe member. A projecting member with a large projecting length is projected.
In the pile building step, the pile member is lifted, and the lower end of the upper pipe member disposed in the inner space of the pile member protrudes below the lower end of the pile member, and the locking member In the state where the projecting member is locked to the upper pipe member, the upper pipe member is connected to the lower pipe member disposed in the inner space of the existing pile member, and then the pile member is lowered to the pile. The pile construction method according to claim 3, wherein a member is connected to the existing pile member.

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