JP2013087594A - Concrete pile with outer shell steel pipe and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete pile with an outer shell steel pipe which reduces work at a construction site and on the pile head of which reinforcing bars can be favorably provided, and to provide a method of manufacturing the same.SOLUTION: The concrete pile with the outer shell steel pipe includes a cylindrical outer shell steel pipe 2, a cylindrical concrete body 3 integrally formed inside the outer shell steel pipe, and a plurality of reinforcing bars 4, 4 arranged in the concrete body 3 at spaces in a pile peripheral direction. It further includes an end plate 14 covering the upper end face of the concrete body 3, a plurality of anti-deflection members 15, 15 which are protruded on the lower face side of the end plate 14 at spaces in the pile peripheral direction and into which the upper ends of the reinforcing bars are inserted, a plurality of bar sheathing pipes 17, 17 which are embedded in a pipe head upper part 3a of the concrete body while being arranged continuously with the anti-deflection members 15 and through which the reinforcing bars are passed, and a partition plate 7 supported by the bar sheathing pipes 17, 17 and arranged at a position where the pile head of the concrete body is separated into an upper part side 3a and a lower part side 3b.

Description

  The present invention relates to a concrete pile with an outer shell steel pipe used for a foundation pile of a concrete structure such as a bridge or an elevated road, and a method for manufacturing the same.

  For foundations of concrete structures such as bridges and elevated roads, a pile foundation structure in which a structure foundation such as a footing is joined to the pile head of a foundation pile buried in the ground is used. In particular, a concrete pile with an outer shell steel pipe (hereinafter referred to as an SC pile) in which a concrete layer is formed by centrifugal compaction inside a cylindrical steel pipe is widely used.

  In the joint structure between the SC pile and the structure foundation part, a plurality of reinforcing bars protruding axially from the pile head are provided at intervals in the circumferential direction of the pile. A structure that is fixed to a part is known.

  Conventionally, this reinforcing steel bar was fixed to the outer peripheral surface of the upper end of the outer shell steel pipe by welding at the construction site after the SC pile was buried in the ground. However, it is difficult to secure an excellent welder due to the poor quality and reliability of the welder, and it depends on the skill of the welder. There was a need for a means to install.

  Therefore, as such means, in the SC pile, similarly to other off-the-shelf piles (for example, PHC piles), reinforcing bars are embedded in advance in the concrete layer of the pile head at the manufacturing stage, and the SC pile Is buried in a state where the pile head protrudes from the ground surface, and the part protruding from the ground surface portion of the outer shell steel pipe is cut off and removed, and then the reinforcing steel bars are exposed by rolling the outer periphery of the concrete layer. Such a method is known (for example, Patent Document 1).

Japanese Patent Laid-Open No. 7-18675

  However, in the conventional technology as described above, since the work of separating the pile head portion of the outer shell steel pipe and the work of crushing the concrete layer are performed at the construction site, the work is likely to be affected by the weather and the like, and the construction period may be prolonged. Therefore, there was a problem that the construction cost increased.

  Therefore, in view of such a conventional problem, the present invention provides a concrete pile with an outer shell steel pipe that can reduce the work on the construction site and can suitably expose the reinforcing steel bars to the pile head, and a method for manufacturing the same. It was made for the purpose.

  The feature of the invention described in claim 1 for solving the conventional problems as described above and achieving an intended object is that the outer shell steel pipe is formed integrally with the outer shell steel pipe. A concrete pile with an outer shell steel pipe having a cylindrical concrete body and a plurality of reinforcing bars oriented in the pile axial direction arranged at intervals in the circumferential direction of the pile in the concrete body. An end plate that covers the end surface, a plurality of anti-blur members that protrude from the lower surface side of the end plate in an arrangement spaced in the circumferential direction of the pile, and into which the upper end of the reinforcing steel bar is inserted, and each anti-blur member And a plurality of reinforcing steel cladding pipes embedded in the upper part of the pile head of the concrete body in a continuous arrangement and having the reinforcing reinforcing bars penetrated therein, and the pile head of the concrete body supported by the reinforcing steel cladding pipes. Provided with a partition plate arranged at a position separating the upper side and the lower side It is in that.

  The invention according to claim 2 is characterized in that a cylindrical outer shell steel pipe, a cylindrical concrete body integrally formed inside the outer shell steel pipe, and an interval in the circumferential direction of the pile are provided in the concrete body. In the manufacturing method of the concrete pile with outer shell steel pipe provided with a plurality of reinforcing steel bars arranged in the axial direction of the pile, the annular partition plate having a plurality of reinforcing bar insertion holes arranged at intervals in the circumferential direction. In addition, one end of the plurality of tubular cladding tubes for the reinforcing bar is fixed so as to be in communication with the reinforcing bar insertion hole, and the cylindrical end plate is disposed in a circumferentially spaced manner. A plurality of anti-blur members are provided in a projecting manner, the plurality of reinforcing reinforcing bars are disposed in the outer circumferential steel pipe at intervals in the circumferential direction of the pile, and the cladding tubes for the reinforcing bars are disposed outside the reinforcing reinforcing bars. By fitting, the partition plate is separated from the end of the outer shell steel pipe by a predetermined distance in the pile axis direction. After being installed at the position, the anti-blur member is fitted to the upper end of the reinforcing reinforcing bar so as to be in contact with the other end of the reinforcing steel cladding tube, and the end plate is opened to the outer shell steel pipe. The end plate is fixed to the opening edge of the outer shell steel pipe, and then concrete is placed in the outer shell steel pipe, and the partition plate is inserted into the outer shell steel pipe. The concrete body is formed so that the pile head is separated from the upper side and the lower side.

  As described above, the concrete pile with an outer shell steel pipe according to the present invention is a cylindrical outer shell steel pipe, a cylindrical concrete body integrally formed inside the outer shell steel pipe, and a pile in the concrete body. In a concrete pile with an outer shell steel pipe provided with a plurality of reinforcing bars oriented in the axial direction of the pile arranged at intervals in the circumferential direction, an end plate covering the upper end surface of the concrete body, and a lower surface side of the end plate A plurality of anti-blur members that are inserted into the pile circumferential direction at intervals and inserted into the upper end of the reinforcing reinforcing bars, and embedded in the upper part of the pile head of the concrete body in a continuous arrangement with the anti-blur members. A plurality of reinforcing steel cladding pipes through which the reinforcing reinforcing bars penetrate, and supported by the reinforcing steel cladding pipes, the pile heads of the concrete body are arranged at positions separating the upper side and the lower side. The outer shell steel pipe is By separating at a position separated by a predetermined distance in the pile axis direction, the upper part can be easily removed from the partition plate of the pile head, and the upper end side part of the reinforcing reinforcing bar can be easily exposed. In addition, it is possible to easily and inexpensively perform the pile head processing of SC piles without requiring concrete work at the construction site.

  The method for manufacturing a concrete pile with outer shell steel pipe according to the present invention includes a cylindrical outer shell steel pipe, a cylindrical concrete body integrally formed inside the outer shell steel pipe, and a pile in the concrete body. In a method for manufacturing a concrete pile with outer steel pipes having a plurality of reinforcing bars oriented in the axial direction of the pile arranged at intervals in the circumferential direction, a plurality of reinforcing bar insertion holes are arranged at intervals in the circumferential direction. One end of the plurality of tubular cladding tubes for a reinforcing bar is fixed to the annular partition plate so as to communicate with the reinforcing bar insertion hole, and the annular end plate is spaced in the circumferential direction. A plurality of cylindrical anti-blur members protruding in the arrangement, the plurality of reinforcing bars are disposed in the outer circumferential direction of the steel pipe at intervals in the pile circumferential direction, and the outer side of each reinforcing bar The partition plate is attached to the end of the outer shell steel pipe by fitting each rebar cladding pipe. After being installed at a position separated by a predetermined distance in the pile axis direction, each of the anti-blur members is fitted to the other end of the reinforcing steel cladding tube in abutment with the upper end of the reinforcing steel reinforcing bar. The plate is installed in an arrangement that closes the opening of the outer shell steel pipe, and the end plate is fixed to the opening edge of the outer shell steel pipe, and then concrete is placed in the outer shell steel pipe to By forming the concrete body in the outer shell steel pipe so that the pile head is separated from the upper side and the lower side by the partition plate, the outer shell steel pipe is separated from the upper end by a predetermined distance in the pile axial direction. By separating, the SC pile can be manufactured so that the upper part can be easily removed from the partition plate of the pile head.

It is a partial fracture front view showing an example of a pile head of a concrete pile with an outer shell steel pipe concerning the present invention. It is a longitudinal cross-sectional view which shows the state which performed the pile head process of the concrete pile with an outer shell steel pipe same as the above. (A)-(c) is a longitudinal cross-sectional view for demonstrating the mold installation process in the manufacturing method of the concrete pile with an outer shell steel pipe concerning this invention.

  Next, an embodiment of the concrete pile with outer shell steel pipe according to the present invention will be described based on examples shown in the drawings. In addition, the code | symbol 1 in a figure is a concrete pile with an outer shell steel pipe.

  This concrete pile with outer shell steel pipe (hereinafter referred to as SC pile) 1 includes a cylindrical outer shell steel pipe 2, a cylindrical concrete body 3 integrally formed inside the outer shell steel pipe 2, and a concrete body 3 A plurality of reinforcing reinforcing bars 4, 4... Oriented in the pile axis direction are provided in the pile circumferential direction at intervals.

  The outer shell steel pipe 2 is formed with a cylindrical steel pipe material, and the upper part of the pile head is cut by a cutting means such as a gas burner or a cutter along a separating line CL indicated by a one-dot chain line in the figure separated from the upper end of the steel pipe by a predetermined distance. 2a is cut off.

  In addition, a hoop bar 16 for holding the concrete body is fixed to the inner peripheral surface of the pile head upper portion 2a by welding or the like, and the outer shell steel pipe 2 and the concrete body 3 are held so as not to move relative to each other in the pile axis direction. Yes.

  In addition, an end plate 14 is fixed to the outer shell steel pipe 2 at the upper end opening edge by welding or the like, and covers the upper end surface of the concrete body 3.

  The end plate 14 is formed in an annular shape with a steel plate material, and a plurality of cylindrical anti-blur members 15, 15... It is installed.

  The anti-blur member 15 is embedded in the upper end portion of the concrete body 3, and the upper end portions of the reinforcing reinforcing bars 4, 4.

  Further, in the pile head upper portion 3 a of the concrete body 3, a plurality of cylindrical reinforcing rod cladding tubes 17, 17... Are embedded continuously with the anti-blur member 15. The upper end side portion of the reinforcing reinforcing bar 4 is penetrated so that the reinforcing steel cladding tube 17 covers the reinforcing reinforcing bar 4 together with the anti-blur member 15.

  The anti-blur member 15 and the reinforcing steel cladding tube 17 are formed in a cylindrical shape having a steel pipe material and have substantially the same diameter, and are embedded in the concrete body 3 in an arrangement in which the joining side end faces are in contact with each other.

  On the other hand, the SC pile 1 is a partition arranged at a position separating the pile head of the concrete body 3 between the upper side 3a and the lower side 3b, that is, at substantially the same position as the separation line CL separated from the upper end of the pile by a predetermined distance. A plate 7 is provided in the outer shell steel pipe 2.

  The partition plate 7 is formed in an annular shape whose outer diameter is smaller than the inner diameter of the outer shell steel pipe 2, and a plurality of reinforcing bar insertion holes 11, 11 through which the reinforcing reinforcing bars 4 are penetrated in a circumferentially spaced arrangement. Is formed.

  Further, the end of the reinforcing bar cladding tube 17 on the opposite side to the anti-blur member 15 is fixed to the reinforcing bar insertion hole 11 by welding or the like on the upper surface of the partitioning board 7. It is supported by the reinforcing steel bars 4, 4 ... via the cladding tubes 17, 17 ..., and the pile heads of the concrete body 3 are connected to the upper side 3a and the lower side 3b in an unfixed state with the outer shell steel pipe 2. It is arranged at a position separated from each other.

  The reinforcing reinforcing bar 4 is formed of a deformed reinforcing bar or the like, and the lower side portion is fixed by being embedded in the concrete body 3 via the partition plate 7, while the upper end side portion is formed by a reinforcing steel cladding tube 17 and an anti-blur member 15. The covering is not fixed to the concrete body 3, and the concrete body pile head upper portion 3a and the upper end side portion of the reinforcing steel bar 4 are in a state of being able to move relative to each other.

  A positioning member 18 is fixed to each reinforcing bar 4 at a predetermined position, and the lower surface of the partition plate 7 is held against the positioning member 18 so that the partition plate 7 is brought to a predetermined position. It is designed to be positioned. In the figure, reference numeral 12 denotes a hoop bar that connects the reinforcing bars 4, 4... In the circumferential direction, and a reinforcing bar 13 is formed by the hoop bar 12 and the reinforcing bar 4.

  The SC pile 1 configured as described above is configured such that the pile head of the concrete body 3 is separated from the upper side 3a and the lower side by the partition plate 7 when the pile head of the SC pile 1 and the structure base A such as footing are joined. 3b, and the upper end side portion of the reinforcing reinforcing bar 4 is covered with the reinforcing steel cladding tube 17 and the anti-blur member 15, so that as shown in FIG. Can easily separate and remove the outer steel pipe 2 and the pile head upper portions 2a and 3a of the concrete body 3 in the pile axis direction, and expose the upper end side portions of the reinforcing bars 4, 4 ... to the pile head. be able to.

  Therefore, the SC pile 1 according to the present invention does not require the work of pouring concrete or the work of welding the reinforcing steel bars 4 at the work site as in the prior art, and can shorten the work period and reduce the cost.

  Further, since the partition plate 7 is not fixed to the outer shell steel pipe 2 and is fixed to the reinforcing steel cladding tubes 17, 17..., The partition is separated when the pile head upper portion 3a of the concrete body is removed. The plate 7 is also removed at the same time so that the upper end surface of the concrete body 3b after the pile head upper portion 3a is removed is exposed.

  Next, the manufacturing method of the above-mentioned concrete pile with a shell steel pipe will be described. In addition, the same code | symbol is attached | subjected to the part similar to the above-mentioned Example, and description is abbreviate | omitted.

  First, one end of each rebar cladding tube 17, 17... Is fixed to one side of the partition plate 7, that is, the upper surface by welding or the like so as to be in communication with the rebar insertion hole 11. A partition plate unit 20 having a shape in which the reinforcing steel cladding tubes 17, 17... Project in the vertical direction from the upper surface portion is formed.

  Further, one end of each of the anti-blur members 15, 15... Is fixed to one side of the end plate 14, that is, the lower side surface with a circumferential interval, and is fixed by welding or the like. An end plate unit 21 having a shape in which the anti-blur members 15, 15... Project in the vertical direction is formed.

  Next, as shown in FIG. 3 (a), a plurality of reinforcing bars 4, 4... And a hoop bar 12 are combined to form a cylindrical reinforcing bar bar 13. The reinforcing bar bar 13 is connected to the outer shell steel pipe 2. Inserted into the outer shell and fixed to the outer shell steel pipe 2 via a fixing bar (not shown), the reinforcing bars 4, 4... Arrange in a different arrangement.

  Then, as shown in FIG. 3 (b), the reinforcing bar claddings 17, 17 ... are fitted to the corresponding reinforcing reinforcing bars 4, 4 ..., and the partition plate unit 20 described above is installed.

  At this time, the partition plate 7 is held against the positioning members 18, 18... So that the partition plate 7 is separated from the end of the outer shell steel pipe 2 by a predetermined distance in the pile axis direction, that is, the separation line CL. It can be installed at approximately the same position. A release agent is applied to the lower surface of the partition plate 7.

  After the partition plate unit 20 is installed, the upper ends (tips) of the reinforcing reinforcing bars 4, 4... Are inserted into the corresponding anti-blur members 15, 15. And the end plate unit 21 is installed, the end plate 14 is disposed so as to close the upper end opening of the outer shell steel pipe 2, and the end plate 14 is placed at the upper end of the outer shell steel pipe 2 at that position. Fix to the opening edge by welding or the like.

  At this time, since the end plate 14 is fixed to the outer shell steel pipe 2, the anti-blur member 15 and the cladding tube 17 for the reinforcing bar take reaction forces on the end plate 14 and the positioning member 18, respectively, and the joining end surfaces butt each other. Thus, the anti-blur member 15 and the reinforcing steel cladding tube 17 are continuously arranged in a state where there is almost no gap between them, that is, in a state where the concrete does not flow.

  As a result, the formwork for centrifugal molding comprising the outer shell steel tube 2, the end plate 14 and the two portions 22a, 22b separated by the partition plate 7 with the end plate disposed at the other end of the outer shell steel tube 2 (not shown). 22 is formed.

  Then, concrete is placed in the mold 22 while rotating around the pile shaft center as a rotation axis, and the concrete body 3 is formed by centrifugal compaction.

  Thereby, the concrete body 3 in which the pile head is separated into the upper side 3a and the lower side 3b by the partition plate 7 in the outer shell steel pipe 2 is formed, and the upper end side portion is the reinforcing steel cladding tube 17 and the anti-blur. The SC pile 1 in which a plurality of reinforcing reinforcing bars 4, 4... Are arranged in the concrete body 3 in the pile circumferential direction at intervals in the pile circumferential direction while being covered with the member 15.

  In the SC pile 1 described above, the reinforcing reinforcing bars 4 may be arranged only on the pile head, or may be arranged over the entire length in the pile axis direction.

A Structure foundation (footing)
CL cut-off line 1 SC pile 2 shell steel pipe 3 concrete body 4 reinforcing reinforcing bar 7 partition plate 11 reinforcing bar insertion hole 12 hoop bar 13 rebar bar 14 end plate 15 anti-blur member 16 hoop bar 17 reinforcing bar cladding 18 positioning member 20 partition Plate unit 21 End plate unit 22 Form frame

Claims (2)

A cylindrical outer shell steel pipe, a cylindrical concrete body integrally formed inside the outer shell steel pipe, and a plurality of piles oriented in the pile axial direction arranged in the concrete body at intervals in the pile circumferential direction In concrete piles with outer steel pipes with reinforced steel bars,
An end plate that covers the upper end surface of the concrete body, a plurality of anti-blur members that protrude from the lower surface side of the end plate in an arrangement spaced in the circumferential direction of the pile, and into which the upper end portion of the reinforcing reinforcing bar is inserted, A plurality of reinforcing steel cladding tubes embedded in the upper part of the pile head of the concrete body in a continuous arrangement with the anti-blur members, the reinforcing steel bars penetrating the reinforcing reinforcing bars therein, and the concrete bodies supported by the reinforcing steel cladding tubes A concrete pile with an outer shell steel pipe, characterized by comprising a partition plate arranged at a position separating the pile head portion of the pile from the upper side and the lower side. A cylindrical outer shell steel pipe, a cylindrical concrete body integrally formed inside the outer shell steel pipe, and a plurality of piles oriented in the pile axial direction arranged in the concrete body at intervals in the pile circumferential direction In the manufacturing method of the concrete pile with outer shell steel pipe provided with reinforcing steel bars of
One end of a plurality of tubular cladding tubes for a reinforcing bar is fixed to an annular partition plate having a plurality of reinforcing bar insertion holes in a circumferentially spaced arrangement so as to communicate with the reinforcing bar insertion holes. In addition, a plurality of cylindrical anti-blur members are protruded in a circumferentially spaced arrangement on the annular end plate,
The plurality of reinforcing reinforcing bars are arranged in the outer circumferential direction of the pile in the outer circumferential direction of the pile, and the respective reinforcing steel cladding pipes are fitted to the outer sides of the reinforcing reinforcing bars so that the partition plate is attached to the outer shell steel pipe. After being installed at a position spaced a predetermined distance from the end of the pile in the direction of the pile axis, the anti-bluring members are fitted to the other end of the cladding tube for reinforcing bar and fitted to the upper end of the reinforcing reinforcing bar. The end plate is installed in an arrangement that closes the opening of the outer shell steel pipe, and the end plate is fixed to the opening edge of the outer shell steel pipe, and then concrete is placed in the outer shell steel pipe. And a concrete body is formed in the said outer shell steel pipe so that a pile head may be separated by the said partition plate into the upper part side and the lower part side, The manufacturing method of the concrete pile with an outer shell steel pipe characterized by the above-mentioned.

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