JP2886376B2 - Anchor structure of pile head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a plurality of ready-made piles, in particular, a steel pipe pile head in footing concrete.

[0002]

2. Description of the Related Art Conventionally, when fixing the head of a steel pipe pile to footing concrete, a steel cage is inserted into the hollow part of the pile head and the upper part is buried in the footing. In general, a method of inserting an anchor reinforcing bar on a pile head and inserting the anchor reinforcing bar into a footing is used.

[0003] Incidentally, in the above-mentioned method of inserting a reinforcing cage, the welding work for preventing slippage must be performed in the hollow portion of the pile, so that the working environment of the welder is not preferable. Can not withstand the large bending moment generated at the pile head when acting.

Further, when the axial force acting on the pile is large, the bearing stress generated in the footing increases, which may cause the footing to break, and further has the disadvantage that the resistance to the pulling force is small.

[0005] In addition, in the method of using the above-mentioned anchor rebar, the welding work on site is complicated, and the welding method is longitudinal, so that the reliability is low.

When the axial force acting on one pile is large, the shearing force and bending moment acting on the footing also increase, and the footing necessarily requires a large cross section.
Casting concrete increases.

Furthermore, a method of externally fitting a pillar frame, in which a plurality of pipes are connected by connecting members, to a pile head, a method of joining a steel member to a shape steel in a pile, or a method of mounting a precast concrete frame on a pile head. There has been proposed a method of mounting and mounting a shaped steel frame to the pile head via a bracket, but the workability is not good due to the inclination of the pile, etc., and concrete is poured into the gap between the pipe and the pile. It takes time and effort to integrate, and the structure is complicated.

The present invention has been developed in order to solve the above-mentioned problem, and provides a footing structure that is resistant to a combined load during an earthquake or the like by connecting a plurality of pile heads during footing with a steel material having high rigidity. It is in.

[0009]

According to the present invention, in a fixing structure of a pile head, a plurality of pile heads are directly overlapped with the lower side of a steel member having high rigidity on a cover steel plate of the pile head. Welded and connected, and buried in footing concrete in that state. A connecting plate is mounted on the upper surface of the steel member at a predetermined interval.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of FIG. 1, two steel pipe piles 1 are driven into the ground A at predetermined intervals, and a cover steel plate 2 is attached to the head of the steel pipe pile 1 so as to close the hollow portion of the pipe pile 1. The steel plate member 3 made of H-shaped steel having high rigidity, which is provided with a gap and is parallel to the cover steel plate 2 at both ends or the lower side of the middle part, is attached to the cover steel plate 2 at the pile head by welding. It is attached by direct welding.
Are connected to each other, and are buried in the footing concrete B in this state.

Reference numeral 5 denotes a reinforcing bar arranged in the footing concrete B. Note that a ready-made concrete pile or the like can be used as the pile.

FIG. 2 shows another embodiment, in which four steel pipe piles 1 are driven into the ground A at the corners of a square.
Steel members 3 made of H-shaped steel with high rigidity are combined in a cross-girder shape, piled on the steel plate 2 of the pile head, the lower side of the steel members 3 is directly welded, and the steel members 3 connect the pile heads. It is buried in footing concrete B.

[0013]

According to the present invention, the lower side of the steel member having high rigidity between the pile heads is fixed on the concrete in a state where the lower side of the steel member is overlapped with the cover steel plate of the pile head and directly connected by welding. Since the steel material having high rigidity and high shear strength bears the shearing force acting on the footing, the footing size and the footing height can be reduced since the footing concrete is reinforced together with the reinforcing steel.

Further, since there is a connecting steel material between the pile tops, the vertical force is reliably transmitted to the pile, and the composite material effectively resists the pulling force and other combined forces such as bending and shearing. Can also be eliminated.

Further, since the lower side of the steel member is placed on the cover steel plate of the pile head and welded, a sufficient welding length is ensured, and the manufacture and construction thereof are simple and easy in construction. Further, the connecting plate on the upper surface of the steel member increases the rigidity of the two steel members and facilitates handling.

[Brief description of the drawings]

FIG. 1 (a) is a plan view and FIG. 1 (b) is a longitudinal sectional view.

FIG. 2 is a plan view of another embodiment of the present invention;
(b) is a longitudinal sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel pipe pile, 2 ... Cover steel plate, 3 ... Steel member, 5 ... Steel bar A ... Ground, B ... Footing concrete

Claims (2)

(57) [Claims] The method according to claim 1 lid steel between a plurality of pile head welded to the pile head, connected by welding directly lower side of the steel member has the size of rigid superimposed on the lid steel of the pile head, The anchoring structure of the pile head, which is buried in footing concrete in that state. 2. The anchoring structure of a pile head according to claim 1, wherein said steel member is provided with a connection plate at a predetermined interval on the upper surface of said parallel steel member.