JPH05230839A - Anchoring part structure of pile head part - Google Patents

Abstract

PURPOSE:To reinforce the anchoring parts of steel pipe piles to footing concrete and reduce the size and height of the footing by connecting the pipe head parts of the steel pipe piles by a steel member. CONSTITUTION:Two steel pipe piles 1, 1 are driven into the ground A, at a specified space, and a lid steel plate 2 is fitted to the head part of each steel pipe pile 1. A steel member 3 formed of H-shape steel of high rigidity is then fitted across the pipe head parts of the steel pipe piles 1 by welding or the like, parallel to the lid steel plate 2. Connecting plates 4 are further fitted at specified spaces apart to the upper face of the steel member 3, and this in the state of the pile head parts being connected to each other is buried in footing concrete B. The steel member having large shearing force can thereby bear the shearing force and bending moment acting upon the footing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a plurality of ready-made piles, particularly a portion where a steel pipe pile head is fixed in footing concrete.

[0002]

2. Description of the Related Art When fixing the head of a conventional steel pipe pile to footing concrete, the lower part of the rebar cage is inserted into the hollow part of the head of the pile and the upper part is embedded in the footing. The method of insertion and the method of using this anchor reinforcing bar are generally used by welding the anchor reinforcing bar to the pile head.

By the way, in the above-mentioned method for inserting a reinforcing bar basket, welding work for preventing slippage must be performed in the hollow portion of the pile, so the working environment of the welder is not preferable, and in the reinforcing bar basket, the arrangement of the main bars is limited, so that horizontal force It cannot withstand the large bending moment generated at the pile head when is applied.

When the axial force acting on the pile is large, the bearing stress generated in the footing becomes large, which may cause footing failure, and the resistance to the pull-out force may be small.

Further, in the method of using the anchor rebar, the welding work at the site is complicated, and the welding method is in the vertical direction, and the reliability is low.

By the way, when the axial force acting on one pile is large, the shearing force and bending moment acting on the footing also become large, so that a large section is inevitably required, and the pouring concrete increases.

The present invention was developed to solve the above problems, and provides a footing structure that is strong against a composite load such as an earthquake by connecting a plurality of pile heads during footing with a steel material having high rigidity. Especially.

[0008]

According to the present invention, a plurality of pile heads in a fixing portion structure for pile heads are embedded in footing concrete with a steel member having high rigidity connected between the pile heads.

[0009]

EXAMPLE In the embodiment shown in FIG. 1, two steel pipe piles 1 are driven into the ground A at a predetermined interval, and a steel plate 2 is attached to the head of the steel pipe pile 1. The steel plates 2 are arranged in parallel. Then, a steel member 3 made of H-shaped steel having high rigidity is attached by welding or the like, and the steel pipe 3 is in a state where the pile heads of the steel pipe pile 1 are connected to each other. It is buried in.

Connection plates 4 are attached to the upper surfaces of the steel members 3 arranged in parallel at predetermined intervals. Reference numeral 5 indicates a reinforcing bar arranged in footing concrete B. It is also possible to use ready-made concrete piles as the piles.

In the embodiment shown in FIG. 2, the end of a steel member 3 made of thick steel plate is welded to the side surface of the pile head to be embedded in footing concrete B in a state where the pile heads are connected to each other. .

In the embodiment shown in FIG. 3, four steel pipe piles 1 are placed in the corners of a square and driven into the ground A, and steel members 3 made of H-shaped steel are combined in a cross beam shape to form a pile head. It is welded and embedded in footing concrete B with the steel members 3 connecting the pile heads.

[0013]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned structure and is fixed in concrete in a state where the heads of the piles are connected by the steel members having high rigidity, the steel material having high shear strength can reduce the shearing force acting on footing. The footing size and footing height can be reduced because the burden and the pile head moment are borne.

Further, since there is a connecting steel material at the top of the pile, the vertical force is reliably transmitted to the pile, and it effectively resists pull-out force, and other combined forces such as bending and shearing. It can be resolved.

[Brief description of drawings]

FIG. 1A is a plan view and FIG. 1B is a longitudinal sectional view in a first embodiment of the present invention.

2 (a) is a plan view and FIG. 2 (b) is a longitudinal sectional view in a second embodiment of the present invention.

3 (a) is a plan view and FIG. 3 (b) is a longitudinal sectional view in a third embodiment of the present invention.

[Explanation of symbols]

1 ... steel pipe pile, 2 ... cover steel plate, 3 ... steel member, 4 ... connecting plate,
5 ... Reinforcing bar A ... Ground, B ... Footing concrete

Claims (2)

[Claims] 1. A fixing unit structure for a pile head, wherein a plurality of pile heads are embedded in footing concrete with a steel member having high rigidity connected to each other. 2. The anchoring structure for a pile head according to claim 1, wherein the pile is a steel pipe pile and the steel member is a shaped steel.