JP5656156B2 - Concrete pile with shell steel pipe - Google Patents

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.

  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.

  Then, in view of such a conventional problem, the present invention is made for the purpose of providing a concrete pile with an outer shell steel pipe that can reduce the work on the construction site and can appropriately expose the reinforcing steel bars to the pile head. It is a thing.

  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. In the concrete pile with outer shell steel pipe, which has a cylindrical concrete body and a plurality of reinforcing bars oriented in the pile axial direction and spaced apart in the circumferential direction of the pile in the concrete body, One end of a plurality of cylindrical reinforcing tube cladding tubes is fixed to an annular partition plate having a plurality of reinforcing bar insertion holes in a placed arrangement so as to communicate with the reinforcing bar insertion holes, and the outer shell steel pipe A plurality of cylindrical anti-blur members project from an annular end plate fixed to the end of the steel plate in a circumferentially spaced manner, and the plurality of reinforcing bars are arranged in the circumferential direction of the pile in the outer shell steel pipe. Are disposed at intervals, and the cladding tubes for the reinforcing bars are fitted outside the reinforcing reinforcing bars. The partition plate is located at a predetermined distance from the end of the outer shell steel pipe in the pile axis direction, and is installed in an unfixed state with the outer shell steel pipe, The other end of the cladding tube for rebar is fitted to the upper end of the reinforcing reinforcing bar in abutment with each other, and in that state, the end plate is fixed to the end of the outer shell steel pipe, and in the outer shell steel pipe, The concrete body is formed so that the pile head is separated into an upper side and a lower side by the partition plate.

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 the concrete pile with outer shell steel pipe with a plurality of reinforcing steel bars oriented in the axial direction of the pile arranged at intervals in the circumferential direction,
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. A plurality of cylindrical anti-blur members project from an annular end plate fixed to an end portion of the outer shell steel pipe at intervals in the circumferential direction, and the plurality of reinforcements are provided in the outer shell steel pipe. Reinforcing bars are arranged at intervals in the circumferential direction of the pile, and each of the reinforcing steel cladding pipes is fitted to the outside of each reinforcing steel reinforcing bar so that the partition plate has a predetermined axial direction from the end of the outer shell steel pipe. In a position spaced apart, the outer shell steel pipe is installed in a non-fixed state,
Each of the anti-blur members is disposed so as to be in contact with the other end of the cladding tube for the reinforcing bar and fitted to the upper end of the reinforcing reinforcing bar so as to close the opening of the outer steel pipe. In 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 by the partition plate, whereby the outer shell steel pipe is predetermined in the pile axial direction from the upper end. The upper part of the pile head can be easily removed, and the upper end of the reinforcing bar can be easily exposed. It is possible to easily and inexpensively perform the pile head processing of SC piles without requiring the work of rolling.

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 manufacture 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 And a plurality of reinforcing reinforcing bars 4, 4... Oriented in the pile axis direction arranged at intervals in the circumferential direction of the pile.

  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.

  Moreover, the end plate 14 is being fixed to this outer shell steel pipe 2 by welding etc. to the upper-end opening edge part.

  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... Projected toward.

  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 cladding tubes 17, 17... Are embedded in a continuous arrangement with the anti-blur member 15. Inside, 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 ... through the cladding tubes 17, 17 ..., and the pile head of the concrete body 3 is placed on the upper side in an unfixed state with the outer shell steel pipe 2. It is arranged at a position separated from 3a and the lower side 3b.

  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 that connects the reinforcing reinforcing bars 4 in the circumferential direction. A reinforcing bar 13 is formed by the hoops 12 and the reinforcing reinforcing bars 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 parts 2a and 3a of the concrete body 3 in the pile axis direction, and the upper end side of the reinforcing bars 4, 4 ... Can be exposed 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.

  Moreover, since the partition plate 7 is in a non-fixed state with respect to the outer shell steel pipe 2 and is fixed to the reinforcing steel cladding tubes 17, 17..., The concrete pile head upper portion 3 a is removed. At this time, the partition 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, manufacture 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 communicate 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 of the plate 7 is formed.

  Further, one end of each of the anti-blur members 15, 15... Is fixed by welding or the like at a circumferential interval on one side of the end plate 14, that is, the lower side surface, and the lower surface of the end plate 14. The end plate unit 21 having a shape in which the anti-blur members 15, 15...

  Next, as shown in FIG. 3A, a plurality of reinforcing bars 4, 4... And a hoop bar 12 are combined to form a cylindrical bar 13 and the bar 13 is removed from the outer side. It is inserted into the shell steel pipe 2 and fixed to the outer shell steel pipe 2 via a fixing reinforcing bar (not shown), and the reinforcing reinforcing bars 4, 4... Arranged at intervals in the circumferential direction.

  And as shown in FIG.3 (b), each reinforcement reinforcing bar 4,4 ... is made to fit each reinforcement cladding tube 17,17 ..., and the partition plate mentioned above Unit 20 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, separated. It can be installed at substantially the same position as the line CL. 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. 4 and the anti-blur member 15 are fitted to each other to install the end plate unit 21, and the end plate 14 is fixed to the upper end opening edge of the outer shell steel pipe 2 by welding or the like at that position.

  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 against 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. An SC pile 1 is formed in which a plurality of 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. The

  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 bar 7 Partition plate 11 Reinforcing bar insertion hole 12 Hoop bar 13 Reinforcing 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 (1)

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,
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. ,
On the annular end plate fixed to the end of the outer shell steel pipe, a plurality of cylindrical anti-blur members are protruded in an arrangement spaced apart in the circumferential direction,
The reinforcing steel bars are disposed in the outer circumferential steel pipe at intervals in the pile circumferential direction,
By fitting each of the reinforcing steel cladding tubes outside the reinforcing steel bars, the partition plate is located at a predetermined distance from the end of the outer shell steel pipe in the pile axis direction, and the outer shell steel pipe Is installed in a non-fixed state,
Each of the anti-blur members is fitted to the upper end portion of the reinforcing reinforcing bar so as to be in contact with the other end portion of the cladding tube for reinforcing bars, and in this state, the end plate is fixed to the end portion of the outer shell steel pipe. ,
The concrete pile with an outer shell steel pipe, wherein the concrete body is formed in the outer shell steel pipe so that a pile head is separated from an upper side and a lower side by the partition plate.

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