JP2017129288A - Method for embedding heat exchange pipes by using precast pile, and support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and safely implement work for embedding heat exchange pipes underground while connecting the heat exchange pipes.SOLUTION: In a precast pile 1, a reinforcement cage 30 to which heat exchange pipes 10 and 20 are attached is mounted within a hollow part. A support device 60 comprising an outer support 61 and inner supports 76 and 76 is mounted on a top face of a lower pile 1A. An upper pile 1B is moved downwards from an upper side of the lower pile 1A, a bottom face of the upper pile 1B is mounted on the outer support 61, and a reinforcement cage 30B of the upper pile 1B is mounted on the inner supports 76 and 76. Continuously, pipes 10B and 20B of the upper pile 1B are connected with pipes 10A and 20A of the lower pile 1A. The inner supports 76 and 76 are removed and the reinforcement cage 30B of the upper pile 1B is joined with a reinforcement cage 30A of the lower pile 1A. Continuously, the upper pile 1A and the lower pile 1B are joined according to an ordinary method. The joined upper pile 1A and lower pile 1B are embedded together with the pipes 10A, 10B, 20A and 20B.SELECTED DRAWING: Figure 4

Description

  The present invention provides a method for burying a pipe for heat exchange using this ready-made pile, comprising a rebar cage equipped with a pipe used for taking out underground heat to the ground, and forming a ready-made pile. The present invention relates to a support device used in the method.

Conventionally, a pipe for heat exchange of a predetermined length is arranged in a ready-made pile, and the pipe for heat exchange is buried at a predetermined depth together with the ready-made pile, and the heat in the ground and the fluid in the pipe are heated. It was exchanged and taken out to the ground. In this case, the length of the ready-made piles is generally limited to about 10 m at the maximum, so when exchanging heat at a deep position of 10 m or more, not only the multiple ready-made piles but also the internal pipes cannot be connected. (Patent Document 1).
In this case, the pipe is connected to a fall prevention device erected in the hollow part of the ready-made pile so that the pipe does not come off from the ready-made pile and the pipe can move a little in the length direction within the ready-made pile. (Patent Document 1). In the fall prevention equipment, a reinforcing bar is installed in the hollow part of the ready-made pile, or an iron plate having a through hole through which a pipe passes is installed.
Moreover, while connecting the upper and lower pipes, the upper ready-made pile was put on the pile holder so that the upper ready-made pile would not fall (Patent Document 1).

JP, 2015-169216, A

  When a large number of pipes are installed in the ready-made piles to increase the heat exchange efficiency, or when pipes longer than the length of the ready-made piles are folded into the ready-made piles However, there has been a problem that the structure of the fall prevention device becomes complicated, and the work of attaching the pipe to the fall prevention device becomes complicated.

  The present invention includes an outer support for supporting the upper pile and an inner support for supporting the reinforcing steel cage accommodated in the upper pile when the pipe is attached to the reinforcing steel cage and connected to the ready-made pile. Since the supporting device provided was used, the above-mentioned problems were solved.

That is, the present invention is a heat exchange pipe using a ready-made pile, characterized in that a rebar cage with a heat-exchange pipe is constructed as follows while connecting a plurality of ready-made piles housed in a hollow portion. It is a burial method.
(1) The rebar cage is formed with substantially the same length as the ready-made pile, and a pipe is attached along the rebar cage.
The pipe is composed of a first pipe and a second pipe, and the first pipe and / or the second pipe are formed longer than the rebar cage, folded and bent,
And the upper end of the said 1st pipe and the upper end of the said 2nd pipe were opened and arrange | positioned in the length direction of the said ready-made pile, and were comprised.
(2) A lower pile made of the ready-made pile in which the lower end of the first pipe communicates with the lower end of the second pipe is lowered into a pile hole of a predetermined length formed in the ground, and the upper end of the lower pile The part is held near the opening of the pile hole.
(3) Subsequently, a support device having a predetermined height having an outer support tool and an inner support tool is placed on the upper surface of the lower pile.
(4) Subsequently, from above the lower pile, the upper pile made of the ready-made pile having the lower end of the first pipe and the lower end of the second pipe opened is lowered to support the lower surface of the upper pile. It mounts on a tool and mounts the rebar cage of the upper pile on the inner support tool.
(5) Subsequently, the lower end of the first pipe and the lower end of the second pipe are drawn downward from the upper pile and connected to the upper end of the first pipe and the upper end of the second pipe of the lower pile, respectively.
(6) Before and after (5), the inner support member is removed and the upper pile and the lower pile are joined.
(7) Subsequently, the outer support is removed, the upper pile is lowered, and is placed on the upper end of the lower pile to join the upper pile and the lower pile.
(8) Subsequently, the joined upper pile and lower pile are lowered in the pile hole.
(9) Next, if necessary, repeat the above steps (2) to (7) to join the required number of upper piles.

Moreover, another invention has the outer support which can support the lower surface of a ready-made pile, and the inner support which can support the reinforcing steel cage (diameter D0) which was equipped in the hollow part of the said ready-made pile, and is comprised as follows. This is a support device.
(1) The outer support is formed with a first support surface having a height H1 and an opening having an inner diameter D1 (> D0).
(2) The inner support has a height H2 (≦ H1), forms a second support surface disposed in the opening in a plan view, and is configured to be removable from the outer support.

In another aspect of the present invention, there is provided a support device configured as follows.
(1) The outer support is substantially the same shape as the end plate of the ready-made pile to be applied, and a donut-shaped bottom plate and an outer support plate having an opening are arranged vertically with a height H1, and the bottom plate and the The outer support plate was connected and fixed with a pillar material, and the upper surface of the outer support plate was used as the first support surface.
(2) The inner support is formed by connecting the upper ends of two vertical members having a height of H2 that can be placed on the bottom plate with a cross member, and the cross member has a structure crossing the opening, and the upper surface of the cross member. Was used as the second support surface.
(3) The inner support member can be taken out of the outer support member through a gap between the column members.

Since this invention attaches the pipe for heat exchange to the reinforcing bar and attaches it to the ready-made pile, the pipe for heat exchange can be easily arranged at a predetermined position in the ready-made pile, and the pipe can be easily placed in the ready-made pile. It can be pulled out and the work of connecting pipes up and down can be made more efficient.
Moreover, since the support device provided with the upper support tool that supports the upper pile and the lower support tool that supports the rebar cage accommodated in the upper pile is used, the upper pile can be safely secured with the upper support tool above the lower pile. With the work space secured between the lower end of the upper pile and the upper end of the lower pile, with the lower end of the upper rebar cage facing the work space, the rebar cages in the upper and upper piles Since it can be held in that position, the connection work can be performed safely.

In the support device of the present invention, (a) is a plan view, (b) is a front view, and (c) is a cross-sectional view taken along line AA. It is an internal support tool used for the support device of this invention, (a) represents a front view and (b) represents a plan view. It is the ready-made pile used for implementation of this invention, (a) is the longitudinal cross-sectional view which abbreviate | omitted a part (only the ready-made pile is cut off), (b) is a BB enlarged end view, (c) is CC An enlarged sectional view is shown. In this invention, it is the longitudinal cross-sectional view (state which cuts off only a ready-made pile) of the state which is using the support apparatus. (A)-(d) represents the schematic longitudinal cross-sectional view (only a ready-made pile is cut) explaining the construction method (front stage) using the support apparatus of this invention. (A) (b) represents the schematic longitudinal cross-sectional view (only a ready-made pile is broken) explaining the construction method (middle stage) using the support apparatus of this invention. (A) (b) represents the schematic longitudinal cross-sectional view (only a ready-made pile is broken) explaining the construction method (back | latter stage) using the support apparatus of this invention.

  Embodiments of the present invention will be described with reference to the drawings.

1. Ready-made pile 1

  The ready-made pile 1 is made of concrete having an inner wall 2 having a length L0 and an outer diameter D00 and an inner diameter D0, and the inside of the inner wall 2 constitutes a hollow portion (FIGS. 3A and 3B). The ready-made pile 1 can be made of a structure other than concrete, for example, a steel pipe, as long as it has a hollow portion with a diameter D0.

2. Pipe device 40 for heat exchange

(1) Eight vertical reinforcing bars 31, 31 are arranged in an annular shape, and helical reinforcing bars 32 are arranged on the entire outer periphery of the vertical reinforcing bars 31, 31, so that the vertical reinforcing bars 31, 31 and the helical reinforcing bars 32 are arranged at predetermined positions. Are further fixed, and end members 33 and 34 made of a steel plate for donuts are fixed to one end (upper end) and the other end (lower end) of the entire vertical reinforcing bars 31 and 31, respectively, to form the reinforcing bar 30. The end members 33 and 34 are formed with four through holes 35 and 35 for connecting the end members 33 and 34 that are stacked in the axial direction (up and down) (FIGS. 3B and 3C). That is, when the reinforcing bars 30 and 30 are arranged in the axial direction, when the axial direction is the vertical direction, the lower surface of the lower end member 34 disposed on the upper side of the reinforcing bar 30 and the lower bars disposed on the lower side. The upper and lower reinforcing steel cages 30 and 30 can be connected by closely contacting the upper surface of the end member 33 on the upper side of the cage 30 and connecting the through holes 35 and 35 to each other.
The reinforcing bar 30 has a length L1 and is substantially the same as or slightly shorter than the length L0 of the ready-made pile 1. Further, the outer diameter D1 of the end members 33 and 34 is formed to be smaller than the inner diameter D0 of the ready-made pile 1, the rebar cage 30 is located substantially in the center of the ready-made pile 1, and the rebar cage 30 in the ready-made pile 1. Can move easily in the vertical direction.

(2) The first pipe 10 is formed by bending and bending one of the pipes for heat exchange that is longer than the length L0 of the ready-made pile 1 (here, about three and a half times L0). Accordingly, the first pipe 10 is folded back and bent so as to have seven straight portions and six bent portions 15 at the top and bottom in the intermediate portion in plan view (FIG. 3B).
The second pipe 20 is formed with a length of about L0.

(3) The first pipe 10 and the second pipe 20 are accommodated in a circle surrounded by the vertical bars 31 and 31 of the reinforcing bar 30, and the seven linear portions 14 and 14 of the first pipe and the second The pipe 20 is arranged along the vertical rebars 31 of the rebar cage 30, and the straight portion 14 of the first pipe 10 and the second pipe 20 are arranged at the corresponding positions of the vertical rebars 31 of the rebar cage 30. , 31 are held by a binding wire or the like. However, the linear portion 14 and the second pipe 20 on the opening side (end portion) of the first pipe 10 are held loosely so as to be slidable by a predetermined length in the length direction with respect to the longitudinal reinforcing bar 31. .
Further, the lower end 13 of the first pipe 10 is arranged in the state of being positioned slightly above (inward) the end member 13 in the vicinity of the end member 34, and the upper end 12 is positioned in the vicinity of the end member 33, The end member 33 is disposed in a state slightly above (outward) the end member 33. Further, the lower end 23 of the second pipe 20 is also disposed in the state of being positioned slightly above (inward) the end member 34 in the vicinity of the end member 34, and the upper end 22 is also disposed in the vicinity of the end member 34, It is arranged in a state where it is positioned slightly above (outside) the end member 34.

(4) As described above, the heat exchanging pipe device 40 for the upper pile (including the intermediate pile) is configured (FIGS. 3A, 3B, and 3C).
Further, in the pipe device 40 for heat exchange for the upper pile, the lower end 13 of the first pipe 10 and the lower end 23 of the second pipe 20 are communicated with each other by a connecting pipe, and used for the lower pile (lowermost end). A pipe device 40 for heat exchange is configured (not shown).

4). Support device 60

(1) The support device 60 is configured by combining an outer support 61 and an inner support 76.

(2) The outer support 61 has substantially the same shape as the cross-section of the ready-made pile 1 to be used, and has a donut-shaped bottom plate 62 with an inner diameter D3 and an outer diameter D4, and a donut-shaped outer support plate with an inner diameter D3 and an outer diameter D4. 67 is arranged with a height H3 therebetween, and the upper surface 63 of the bottom plate 62 and the lower surface 69 of the outer support plate 67 are connected by pillar members 74, 74 arranged radially. Accordingly, circular openings 65 and 70 having a diameter D3 are formed in the bottom plate 62 and the outer support plate 67, respectively (FIG. 1). Further, the upper surface 68 of the outer support plate 67 constitutes a first support surface.
Guide protrusions 72 and 72 that are in contact with the outer wall 2a of the ready-made pile 1 to be used and are equally spaced on the outer peripheral side on the lower surface 69 of the bottom plate 62 and on the outer peripheral side of the upper surface 68 of the outer support plate 67. It protrudes in an annular shape. Therefore, the outer diameter D4 of the bottom plate 62 and the outer support plate 67 is smaller than the outer diameter D00 of the ready-made pile 1.
D4> D00
It is formed with. In addition, the outer diameter D3 of the bottom plate 62 and the outer support plate 67 is smaller than the inner diameter D0 of the ready-made pile 1.
D3≈D0
It is formed with a degree.

(3) The bottom plate 62 is divided into two bottom plate pieces 62a and 62a, and the upper support plate 67 is divided into two outer support plate pieces 67a and 67a. Column members 74 and 74 are arranged along the contact line 66 and the contact line 71 of the outer support pieces 67a and 67a. Therefore, the two column members 74 and 74 are disposed close to each other along the contact lines 66 and 71.
Further, the height H3 of the outer support 61 is determined in consideration of the connection work.
H3 = about 30 to 100 cm.

(4) The inner support member 76 is formed in a gate shape in which the upper ends of the vertical members 78, 78 that can be arranged on the upper surface 63 of the bottom plate 62 of the outer support member 61 are connected by a cross member 79. A contact plate 77 having a shape that fits on the upper surface 63 of 62 is continuously provided (FIGS. 2A and 2B). The height from the lower surface of the contact plate 77 to the upper surface 80 of the cross member 79 is formed of H5,
H5 <H3
Is set in

(5) The support plate 60 is configured by placing the contact plates 77 and 77 of the inner support 76 on the upper surface 63 of the bottom plate 62 of the outer support 61 and installing the two inner supports 76 and 76. (FIG. 1). In the support device 60, the cross member 79 of the inner support tool 76 crosses the openings 65 and 70 of the outer support tool 61 in a plan view and a bottom view (FIGS. 1A and 1C). Further, each of the inner supports 76 and 76 can be taken out from between the column members 74 and 74 of the outer support 61 in the lateral direction.

5. Method of burying pipes 10 and 20 for heat exchange

(1) The ready-made pile 1 and the heat exchanging pipe device 40 configured as described above are normally manufactured in a factory, and a predetermined number is carried into a construction site. Before starting the burying operation, the pipe device 40 for heat exchange is inserted into the hollow portion of each ready-made pile 1, and the upper and lower end members 33, 34 of the reinforcing bar 30 of the pipe device 40 for heat exchange are inserted. Each is located in the vicinity of the upper end 3 and the lower end 4 of the ready-made pile 1. In this state, a ready-made pile with a heat exchange pipe is constructed. In addition, it can also carry in to a construction site in the state which comprised the ready-made pile (the ready-made pile 1 which equipped the pipe device 40 for heat exchange) which was equipped with the pipe for heat exchange beforehand in the factory.

(2) Next, the pile hole 51 is excavated from the ground 50 to a predetermined depth by an arbitrary method.

(3) A prefabricated pile (lower pile) 1A equipped with a pipe device 40A for heat exchange for the lower pile is attached to the pile driving machine by a predetermined method, and the ready-made pile (lower pile) 1A is lowered into the pile hole 51. Then, the ready-made pile (lower pile) 1A is safely held in a state where the upper end portion of the ready-made pile (lower pile) 1A is exposed near the ground 50 (FIG. 5A).

(4) Next, the outer support 61 is placed on the upper surface (the upper surface of the end plate) of the ready-made pile (lower pile) 1A. At this time, if the inner edges of the guide protrusions 72, 72 on the lower surface 64 of the bottom plate 62 are aligned with the outer wall 2a of the ready-made pile (lower pile) 1A, the outer support 61 is easily aligned with the ready-made pile (lower pile) 1A. Can be installed. Also, the inner supports 76 are placed on the upper surface 63 of the bottom plate 62 of the outer support 61. In this state, the installation of the support device 60 is completed. The support device 60 can be installed in a state where the ready-made pile (upper pile) 1B is lifted and lowered to the vicinity of the ready-made pile (upper pile) 1A.

(5) Next, a ready-made pile (upper pile) 1B equipped with a heat exchanging pipe device 40B for the upper pile is attached to the pile driving machine, and the upper side of the ready-made pile (lower pile) 1A held near the ground 50 Then, the ready-made pile (upper pile) 1B is lowered, and the ready-made pile (upper pile) 1B is placed on the upper surface 68 of the outer support plate 67 of the outer support 61 on the upper surface of the ready-made pile (lower pile) 1A. At this time, if the outer wall of the ready-made pile (upper pile) 1B is placed along the inner edge of the guide projections 72, 72, the axis of the ready-made pile (upper pile) 1B is aligned with the axis of the outer support 61, and the ready-made pile ( Upper pile) Hold 1B safely. Further, the reinforcing bar 30B is drawn downward from the ready-made pile (upper pile) 1B and placed on the upper surface 80 of the cross member 79 of the inner supports 76, 76 (FIGS. 5A and 4).

(6) Next, in the pipe device 40B for heat exchange of the ready-made pile (upper pile) 1B, a joint for connection (hollow cylindrical shape) is respectively connected to the lower end 13B of the first pipe 1B and the lower end 23B of the second pipe 20B. ) 42 is attached (FIG. 5B).

(7) Subsequently, the first pipe 10B to which the joint 42 is attached is pulled out downward (below the lower end 4B of the ready-made pile 1B), and the upper end 12A of the first pipe 10A of the ready-made pile (lower pile) 1A located below. The lower end portion of the joint 42 is attached to the upper and lower pipe devices 40A and 40B for exchanging heat so that the first pipes 10A and 10B are communicated with each other.
Similarly, the second pipe 20B to which the joint 42 is attached is pulled out downward (below the lower end 4B of the ready-made pile 1B), and the joint 42 is connected to the upper end 22A of the second pipe 20A of the ready-made pile (lower pile) 1A located below. The second pipes 20A and 20B are communicated with each other by the upper and lower heat exchanging pipe devices 40A and 40B (see FIG. 5C).

(8) Subsequently, the inner supports 76, 76 are removed from the support device 60 (FIG. 5 (d)), and the rebar cage 30B is replaced with the ready-made pile (upper pile) 1B by the pipe device 40B for heat exchange. Pulled out from the upper pile) 1B, the lower end member 34B of the upper rebar cage 30B and the upper end member 33A of the lower rebar cage 30A are brought into close contact with each other to allow the through holes 35 and 35 to communicate (FIG. 6 ( a)). Subsequently, the end members 33A and 34B are connected to the through holes 35 and 35 communicated with the close end members 33A and 34B with bolts and nuts (FIG. 6B).

(9) Subsequently, the ready-made pile (upper pile) 1B is once raised, and the outer support 61 is used to open the half bottom plate pieces 62a and 62a and the outer support plate pieces 67a and 67a. The outer support 61 is removed from the pile) 1B, the ready-made pile (upper pile) 1B is lowered, and the lower end 4B of the ready-made pile (upper pile) 1B and the upper end 3A of the ready-made pile (lower pile) 1A are Are connected (FIG. 7A). Subsequently, the holding of the ready-made pile (lower pile) 1A near the ground 50 is released, and the connected ready-made pile (upper pile) 1B and the ready-made pile (lower pile) 1A are lowered in the pile hole 51 (see FIG. 7 (b)).

(10) Similarly, while connecting the required number of ready-made piles (upper piles) 1B and 1B, the rebar cages 30B and 30B positioned above and below, the first pipes 10B and 10B, and the second pipes 20Bm20B are connected. (Not shown). In the state where the upper end 12B of the first pipe 10B and the upper end 22B of the second pipe 20B of the ready-made pile (upper pile) 1B positioned at the top are located above the ground 50, the burying of the connected ready-made piles 1A and 1B is completed. Then, the upper end 12B of the first pipe 10B and the upper end 22B of the second pipe 20 are connected to ground piping (not shown).
Thus, the heat exchange in which the first pipes 10B, 10B, ..., 10A and the second pipes 10A, 10B, ..., 10B are connected to one through the pipe devices 40A, 40B for heat exchange. The burial of the pipe is completed.

(11) In the above, if the upper and lower heat exchanging pipe devices 40A and 40B of (5) to (7) are connected, the interval between the vertical reinforcing bars 31 and 31 of the reinforcing bar 30 and the pitch of the helical reinforcing bar 32 are increased. The rebar cages 30A and 30B are connected first, and an operator puts a hand between the rebars 31, 31, and 32 to connect the first pipes 10A and 10B and the second pipes 20A and 20B first. As a result, the connection of the first pipe 10, the second pipe 20, and the reinforcing bar 30 can be performed in any order (not shown).

6). Other embodiments

(1) In the configuration of the first pipe 10 of the above aspect, as long as at least one portion to be folded and bent is formed (one bent portion 15 and two linear portions 14), the number of turns is arbitrary. It is. Further, the second pipe 20 is linear with a length of about L0. However, the second pipe 20 may be formed longer than the length L0 and be bent back like the first pipe 10 (not shown). .

(2) In the embodiment, in the configuration of the reinforcing bar 30, the first pipe 10 and the second pipe 20 are held in the hollow portion of the ready-made pile 1, and the first pipe 10 and the second pipe 20 are ready-made piles. If the first pipe 10 and the second pipe 20 can be slightly slid with respect to the ready-made pile 1, the configuration of the reinforcing bar 30 is arbitrary (not shown). Absent). Further, the end members 33 and 34 can be omitted (not shown).

(3) Moreover, in the said embodiment, in the support apparatus 60, the outer support 61 can be mounted on the ready-made pile (lower pile) 1A, can support the ready-made pile (upper pile) 1B, and, in this state, an upper and lower reinforcing bar If the operation | work which connects the cage | basket | car 1A, 1B can be performed, and it can remove from the ready-made pile 1A, 1B in the state which connected the upper and lower rebar cage | basket | car 1A, 1B, the structure is arbitrary (not shown).

(4) In the support device 60, the inner support 76 has a height H5 that is H5 <H3 with respect to the height H3 of the outer support 61.
H5 = H3 or H5> H3
(Not shown).
The inner support 76 can be attached to the outer support 61, supports the reinforcing bar 30B of the ready-made pile (upper pile) 1B, can be prevented from falling, and can be detached from the outer support 61. (Not shown).

1, 1A, 1B Ready-made pile 2 Ready-made pile inner wall 2a Ready-made pile outer wall 3, 3A, 3B Ready-made pile upper end 4, 4A, 4B Ready-made pile lower end 10, 10A, 10B First pipe 11 First pipe linear shape Portions 12, 12A, 12B Upper end 13, 13A, 13B of first pipe Lower end 20, 20A, 20B of first pipe Second pipe 22, 22A, 22B Upper end 23, 23A, 23B of second pipe Lower end 30 of second pipe , 30A, 30B Reinforcing bar 31 Vertical reinforcing bar 32 Spiral reinforcing bar 33, 33A, 33B End member (upper)
34, 34A, 33B End member (bottom)
40, 40A, 40B Heat exchange pipe device 42 Joint 50 Ground 51 Pile hole 60 Support device 61 Outer support tool 62 Outer support tool bottom plate 62a Bottom plate piece 65 Bottom plate opening 67 Outer support plate 67a Outer support plate piece 70 Outer support Plate opening 72 Guide protrusion 74 Column member 76 Inner support 77 Contact plate 78 Vertical member 79 Horizontal member

Claims (3)

A heat exchanging pipe embedding method using a ready-made pile, characterized in that a rebar cage with a heat exchanging pipe is configured as follows while connecting a plurality of ready-made piles housed in a hollow portion.
(1) The rebar cage is formed with substantially the same length as the ready-made pile, and a pipe is attached along the rebar cage.
The pipe is composed of a first pipe and a second pipe, and the first pipe and / or the second pipe are formed longer than the rebar cage, folded and bent,
And the upper end of the said 1st pipe and the upper end of the said 2nd pipe were opened and arrange | positioned in the length direction of the said ready-made pile, and were comprised.
(2) A lower pile made of the ready-made pile in which the lower end of the first pipe communicates with the lower end of the second pipe is lowered into a pile hole of a predetermined length formed in the ground, and the upper end of the lower pile The part is held near the opening of the pile hole.
(3) Subsequently, a support device having a predetermined height having an outer support tool and an inner support tool is placed on the upper surface of the lower pile.
(4) Subsequently, from above the lower pile, the upper pile made of the ready-made pile having the lower end of the first pipe and the lower end of the second pipe opened is lowered to support the lower surface of the upper pile. It mounts on a tool and mounts the rebar cage of the upper pile on the inner support tool.
(5) Subsequently, the lower end of the first pipe and the lower end of the second pipe are drawn downward from the upper pile and connected to the upper end of the first pipe and the upper end of the second pipe of the lower pile, respectively.
(6) Before and after (5), the inner support member is removed and the upper pile and the lower pile are joined.
(7) Subsequently, the outer support is removed, the upper pile is lowered, and is placed on the upper end of the lower pile to join the upper pile and the lower pile.
(8) Subsequently, the joined upper pile and lower pile are lowered in the pile hole.
(9) Next, if necessary, repeat the above steps (2) to (7) to join the required number of upper piles. A support having an outer support that can support the lower surface of the ready-made pile and an inner support that can support a reinforcing steel cage (diameter D0) housed in the hollow portion of the ready-made pile, and is configured as follows. apparatus.
(1) The outer support is formed with a first support surface having a height H1 and an opening having an inner diameter D1 (> D0).
(2) The inner support has a height H2 (≦ H1), forms a second support surface disposed in the opening in a plan view, and is configured to be removable from the outer support. The support device according to claim 2, which is configured as follows.
(1) The outer support is substantially the same shape as the end plate of the ready-made pile to be applied, and a donut-shaped bottom plate and an outer support plate having an opening are arranged vertically with a height H1, and the bottom plate and the The outer support plate was connected and fixed with a pillar material, and the upper surface of the outer support plate was used as the first support surface.
(2) The inner support is formed by connecting the upper ends of two vertical members having a height of H2 that can be placed on the bottom plate with a cross member, and the cross member has a structure crossing the opening, and the upper surface of the cross member. Was used as the second support surface.
(3) The inner support member can be taken out of the outer support member through a gap between the column members.

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