JPH0516840U - PC pile head reinforcement structure - Google Patents

Abstract

(57) [Summary] [Purpose] A pile head reinforcement unit consisting of a joint ring with pile head reinforcement bars effectively increases the strength of the pile head as well as the workability of PC piles, and improves the earthquake resistance and reliability. It is to provide a head reinforcement structure. [Structure] In the head of a ready-made PC pile 1, a pile head reinforcing unit 4 in which the lower ends of a plurality of pile head reinforcing bars 6 are fixed to a joining ring 5 in advance is attached to a fixing plate 3 of the pile head of the PC pile 1. It is characterized by being joined.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a head reinforcement structure for a PC pile, which is suitable as a pile foundation for various structures.

[0002]

[Prior Art]

 Conventionally, the head reinforcement structure of PC piles (precast concrete piles) has a cage-shaped reinforcement consisting of vertical and hoop reinforcements inserted into the hollow portion of the pile head and erected to form the pile head and foundation. The structure is such that concrete is cast in one piece. However, since the outside diameter of the cage-like muscle is the hollow inside diameter of the pile, there is a limit to the reinforcement of the pile head, and there are many problems in terms of seismic resistance.

[0003]

[Problems to be solved by the device]

 As described above, the conventional head reinforcement structure for PC piles has its own limit to the reinforcement of the pile head by the cage-like muscles, and has problems such as earthquake resistance and reliability.

The present invention was developed in order to solve the above problems, and its purpose is to improve workability by using a pile head reinforcement unit composed of a joint ring with pile head reinforcement bars. It is to provide a head reinforcement structure for PC piles that effectively enhances the strength of the pile heads and improves the earthquake resistance and reliability.

[0005]

[Means for Solving the Problems]

 According to the present invention, a head of a ready-made PC pile is joined to a fixing plate of a pile head of a PC pile by joining a pile head reinforcement unit in which the lower ends of a plurality of pile head reinforcements are fixed to a joint ring in advance. It facilitates the construction of the pile head and effectively enhances the strength resistance.

[0006]

[Action]

 By joining the pile head reinforcement unit, which is made by fixing the lower ends of multiple pile head reinforcements to the joining ring beforehand, by joining it to the fixing plate of the pile head of the PC pile, the joining ring and multiple The pile head reinforcements are easily and accurately integrated together to effectively increase the pile head strength, and the strength is automatically adjusted by the size and number of pile head reinforcements. Earthquake resistance and reliability are obtained.

[0007]

【Example】

 1 and 2 show one embodiment of the present invention, and FIG. 3 shows another embodiment. In the figure, 1 is a ready-made PC pile, 2 is a steel rod embedded in the PC pile 1, 3 is a fixing plate fixed to the upper end of the head of the PC pile 1, 4 is a pile head reinforcing unit, 5 is a fixing plate 3 A joining ring fixed by welding 5a on the upper portion, 6 is a pile head reinforcing bar fixed by welding 6a on the joining ring 5, and the joining ring 5 has an L-shaped cross section as shown in FIGS. Alternatively, as shown in FIG. 3, a ring-shaped metal piece having a flat plate cross-section is formed, and a plurality of pile head reinforcing bars 6 are previously welded 6a at circumferential intervals to the joint ring 5 and project upward to form a pile head. It is composed of a reinforcement unit 4.

As shown in FIG. 1 (A), a pile head reinforcing unit 4 in which lower ends of a plurality of pile head reinforcing bars 6 are welded 6a and fixed to a joining ring 5 in advance is shown in FIG. 1 (B). As shown, it is welded 5a to the fixing plate 3 fixed to the upper end of the pile head of the PC pile 1 to be joined, and then the reinforcement of the foundation 10 (not shown) is provided around it to make concrete. C is placed, and the foundation 10 is integrally joined with the pile head to reinforce the pile head of the PC pile 1. Reference numeral 11 in the figure denotes a bottom plate arranged in the head of the PC pile 1.

The pile head reinforcing unit 4 unitized by previously fixing the lower ends of the plurality of pile head reinforcing bars 6 to the joining ring 5 is easily and accurately fixed on the fixing plate 3 of the pile head of the PC pile 1. The pile head is strongly reinforced by the fixing plate 3 and the joint ring 5 and the pile head reinforcing bar 6 which are attached, and the stress of each steel rod 2 of the PC pile 1 is fixed by the fixing plate 3 and the fixing plate 3. It is transmitted to each pile head reinforcing bar 6 through the joint ring 5 to effectively increase the strength of the pile head, and by adjusting the size and number of the pile head reinforcing bar 6, The strength is freely adjusted to the desired value, and excellent seismic resistance and reliability are obtained.

[0010]

[Effect of the device]

 The present invention is constructed as described above, and a pile head reinforcing bar unit including a joint ring and a plurality of pile head reinforcing bars is easily and accurately fixed to a fixing plate on a pile head of a PC pile. The workability and the strength of the pile head can be effectively increased, and the strength of the pile head can be freely adjusted depending on the size and number of the pile head reinforcements. It has been greatly improved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view (A), (B) showing a pile head reinforcing process according to an embodiment of the present invention.

2A and 2B are plan view mechanical diagrams of FIG. 1A and FIG.
Enlarged vertical sectional view of part X (B)

FIG. 3 is an enlarged vertical sectional view of a portion corresponding to X in FIG. 1 (B) showing another embodiment of the present invention.

[Explanation of symbols]

 1 PC pile 3 Anchoring plate 4 Pile head reinforcement unit 5 Joining ring 6 Pile head reinforcement

Front page continuation (72) Inventor Sumio Maezawa 1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (1)

[Scope of utility model registration request] 1. A head portion of a ready-made PC pile, wherein a pile head reinforcing unit having the lower ends of a plurality of pile head reinforcing bars fixed in advance to a joining ring is joined to a fixing plate of the pile head of the PC pile. A head reinforcement structure for PC piles.