JP2000027198A - Pile head structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily arrange reinforcing bars on a circumference in the diameter larger than the outer diameter of a pile by a method wherein pile head connecting reinforcements attached to the side of a pile head are extended toward the radial direction of the pile and positioned on the circumference in the diameter larger than the diameter of the pile. SOLUTION: A required number of pile head connecting reinforcements 2 are bent at their lower part respectively at 30-60 degrees of bending angle αand attached and fixed by welding to the side of the head of a pile 1, and the pile head connecting reinforcements 2 are extended toward the radial direction of the pile and positioned on a circumference in the diameter R2 that is larger than the diameter R1 of the pile. Then, the pile head connecting reinforcements 2 are formed into a reinforcing bar basket with tie hoops 3 applied, and the reinforcing bar basket is buried in an anchor concrete A. Thereby, reinforcing bars can be easily arranged on the circumference in the diameter larger than the diameter of the pile 1 while situations wherein axial force or horizontal force is higher can be dealt with and works in bar arrangement and construction can be executed easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile connected to a footing, and more particularly to a head structure of a steel pipe pile and an SC pile.

[0002]

2. Description of the Related Art Conventionally, in order to connect a pile head and a footing, a lower part of a reinforcing bar is inserted into a hollow portion of the pile head as a reinforcing steel, or FIGS.
As shown in (1), a reinforcing bar is attached to the outer peripheral surface of the pile head by welding, and the reinforcing bar rises straight above the pile head, and the pile diameter R1
In general, a structure in which the inner diameter R2 of the steel cage is the same as that of the steel cage and the steel cage is embedded in the footing concrete is used.

[0003] When the axial force or horizontal force acting on the pile increases, the arrangement of the reinforcing steel bars becomes denser, and it is not easy to process and construct.

[0004] The present invention has been developed in view of the above circumstances, and has devised a structure in which reinforcing bars can be easily arranged on a circumference larger than the outer diameter of a pile.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a pile head structure in which a pile head connection reinforcing bar attached to a side surface of a pile head is extended outward from a pile radius so as to be located on a circumference larger than the pile diameter. is there. The lower part of the pile-head connection rebar is bent outward to protrude. As another means, the lower part of the connection reinforcement of the pile head is attached to a flange radially protruding from the periphery of the pile head to protrude. As another means, a steel plate is provided on the flange, and the lower end of the pile head connection reinforcing bar is attached to the steel plate. As still another means, the lower part of the pile head connection rebar is curved, and the tip is butt-welded to the periphery of the pile to protrude.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a pile head connecting reinforcing bar 2 buried in anchor concrete A attached to the side of the head of a pile 1 and protrudes outward in the radius of the pile to be positioned on the circumference of a diameter R2 larger than the pile diameter R1. The hoop bar 3 forms a reinforced cage.

In the embodiment shown in FIG. 1, the lower part of the required number of pile head connection reinforcing bars 2 is bent and welded to the side of the head of the pile 1 to be fixed. The bending angle α is 30 to 60 degrees.
In the embodiment shown in FIG. 3, flanges 4 are provided on the outer periphery of the pile head by welding in a radial manner, and a pile head connection reinforcing bar 2 is attached to the tip of each flange 4 by welding.

In the embodiment shown in FIG. 5, an annular steel plate 5 is mounted on a flange 4 protruding from the periphery of the pile head, and the lower end of the pile head connection reinforcing bar 2 assembled with the hoop bar 3 is mounted on the steel plate. is there.

In the embodiment shown in FIG. 7, the lower end of the pile head connection reinforcing bar 2 is curved, and the tip is butt-welded to the outer periphery of the pile 1 to protrude.

In the above embodiment, B is the excavated bottom at the site,
C1 indicates chestnut stone, and C2 indicates discarded concrete.

[0011]

According to the present invention, since the peripheral outer diameter of the pile head connection reinforcing bar can be configured to be larger than the diameter of the pile, it is possible to cope with the case where the axial force and the horizontal force are large, and furthermore, the pile is formed in a cage shape. It is easy to assemble and construct the reinforcing bar of the head connection rebar, especially the lower bending and bending process of the pile head connection rebar, the radial flange, and the mounting process of the receiving steel plate, and the practicality is large.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a longitudinal sectional view of a second embodiment.

FIG. 4 is a cross-sectional view of FIG.

FIG. 5 is a longitudinal sectional view of a third embodiment.

FIG. 6 is a cross-sectional view of FIG.

FIG. 7 is a longitudinal sectional view of a fourth embodiment.

8 is a cross-sectional view of FIG.

FIG. 9 is a longitudinal sectional view of a conventional example.

FIG. 10 is a cross-sectional view of FIG.

[Explanation of symbols]

1 ... pile, 2 ... pile head connection rebar, 3 ... hoop rebar, 4 ... flange, 5 ... steel plate.

Claims (5)

[Claims] 1. A pile head structure, wherein a pile head connection reinforcing bar attached to the side of the pile head is extended outward in the radius of the pile so as to be located on a circumference larger than the diameter of the pile. 2. The pile head structure according to claim 1, wherein the lower portion of the pile head connection reinforcing bar is bent outward to protrude. 3. The pile head structure according to claim 1, wherein a lower portion of the pile head connection reinforcing bar is attached to a flange radially projecting from an outer periphery of the pile head to protrude. 4. The pile head structure according to claim 1, wherein the lower end of the pile head connection reinforcing bar is attached to a steel plate on a flange projecting from an outer periphery of the pile head. 5. The pile head structure according to claim 1, wherein a lower part of the pile head connection rebar is curved, and a tip is butt-welded to an outer periphery of the pile to protrude.