JPH073816A - Form for pile head filling concrete - Google Patents

Abstract

PURPOSE:To combine a bottom slab with a PC pile surely and easily by installing a bottom form to specific depth from the upper end of the PC pile, and filling concrete also in a PC pile head simultaneously in the case the concrete bottom slab is formed. CONSTITUTION:A bottom form 3 is inserted in a hollow section 13 in a head 11A of a PC pile 11 driven in the ground G, the upper parts of leg members 5 and 5 are bent to interlock with the upper end 17 of the PC pile 11, and the bottom form 3 is borne in specific depth from the upper end of the PC pile 11. After that, a built-up reinforcing bar 23 is mounted on the bottom form 3 and is positioned. Then, after required reinforcing bars, etc., are arranged on the ground G, concrete C is placed, and a concrete bottom slab 31 is formed. Simultaneously, the concrete C is also poured on the bottom form 3, the head 11A of the PC pile 11 is filled with the concrete C, and the concrete bottom slab 31 is combined with the PC pile 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention, after driving hollow precast concrete piles such as PC piles and RC piles into the ground,
The present invention relates to a formwork for pile-head filling concrete for integrating a concrete bottom slab (foundation concrete) provided on this ground with an existing concrete pile.

[0002]

2. Description of the Related Art Precast concrete piles are manufactured in such a length that at least their tips can reach the supporting layer in order to transfer the load of the structure to the supporting layer having a supporting force. Then, a concrete bottom slab is provided on the ground into which the precast concrete pile is driven, but in the case of a hollow concrete pile such as a PC pile or an RC pile, this concrete bottom slab and the concrete pile are integrated. Therefore, it is necessary to pour concrete into the upper part of the concrete pile when forming the concrete bottom slab. Therefore, conventionally, the space inside the hollow concrete pile driven into the ground is filled with sand up to the head, and when the concrete bottom slab is formed, concrete is poured into the concrete pile over the sand, By filling the head with concrete, the concrete slab and the hollow concrete pile are integrated.

[0003]

Therefore, in the conventional construction method, it is necessary to fill the inside of the concrete pile driven into the ground with sand up to the head thereof, which is troublesome and increases the work efficiency of the concrete foundation construction. There was a problem that it could not be done and the cost was high. The present invention has been devised in view of the above circumstances, and an object of the present invention is to allow concrete heads to be filled with concrete at the time of forming a concrete bottom slab by simple work. The purpose of the present invention is to provide a formwork for pile-filled concrete that can improve work efficiency and reduce costs.

[0004]

In order to achieve the above-mentioned object, the present invention relates to a concrete formwork for pile-head filling concrete which is attached to the head of a hollow concrete pile driven into the ground. A bottom formwork inserted into the space inside the pile and receiving concrete poured into the space, and a bottom formwork attached to the outer periphery of the bottom formwork, contacting the inner peripheral surface of the concrete pile and the outer periphery of the bottom formwork. And an elastic member for closing the gap between the inner peripheral surface and the inner peripheral surface, the upper part of the bottom formwork protruding from the bottom formwork is locked to the upper end of the concrete pile, the bottom formwork from the upper end of the concrete pile. And a leg member that is supported at a predetermined depth.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional front view of a pile head filling concrete form according to an embodiment, FIG. 2 is a plan view of the same, and FIG. 3 is an explanatory view of a usage state. 1 is a formwork for pile head filling concrete, 1 is a formwork for pile head filling concrete, a bottom formwork 3 and a leg member 5.
And an elastic member 7. The bottom mold 3 is made of precast concrete and has a disk shape. The bottom mold 3 is a cylindrical space 13 inside the PC pile 11.
The outer diameter is slightly smaller than the inner diameter of the.

The elastic member 7 is made of rubber or the like and the bottom mold 3 is formed.
Is attached to the outer periphery of the upper surface of the. The elastic member 7 has an outer periphery of the bottom mold 3 and an inner peripheral surface 15 defining the space 13 when the bottom mold 3 is inserted into the cylindrical space 13 inside the PC pile 11. It is for closing the gap between them.

The lower portion of the leg member 5 is embedded in the bottom mold 3 and protrudes upward by a predetermined length. In the embodiment, the leg member 5 is composed of four smoothed iron wires. The leg member 5 is bent or the like so that the upper portion thereof is locked to the upper end 17 of the PC pile 11 and the bottom formwork 3 inserted into the space 13 is set to P.
It is for supporting at a predetermined depth from the upper end 17 of the C pile 11.

Next, the concrete foundation work using the pile head filling concrete formwork 1 will be described with reference to FIG. After the PC pile 11 is driven into the ground G, the excess portion exposed on the ground G is cut off, and 19 in the figure is the PC pile 1
PC steel material projecting from the upper end 17 of the reference numeral 1 and 21 a reinforcing bar. When mounting the pile head filling concrete formwork 1 to the tubular portion 11A of the PC pile 11, first, the bottom formwork 3 is inserted into the space portion 13, and the upper portion of the leg member 5 is bent to form the upper end 17 of the PC pile 11. And the bottom formwork 3 is supported from the upper end 17 of the PC pile 11 to a predetermined depth. Next, the assembled reinforcing bar 23 is placed and positioned on the bottom mold 3.
Next, after reinforcing bars and the like are arranged on the ground G, concrete C is placed on the ground G to form a concrete bottom slab 31. Then, at the time of placing the concrete C on the ground G, the concrete C is also poured on the bottom formwork 3 to fill the head 11A of the PC pile 11 with the concrete C, and the concrete bottom slab 31 and the PC pile 11 are Unify.

According to this embodiment, the bottom formwork 3 is set on the head portion 11A of the PC pile 11 by the leg member 5, so that the PC
Since the concrete C can be received in the head 11A of the pile 11, it is possible to omit the troublesome work of filling the space portion 13 of the PC pile 11 to a predetermined depth with the conventional work, and to perform the concrete bottom slab by a simple work. At the time of forming 31, the concrete head 11A of the concrete pile 11 can be filled with the concrete C, and the work efficiency of the concrete foundation work can be improved and the cost can be reduced. Further, since the elastic member 7 is disposed on the outer periphery of the bottom mold 3, leakage of the concrete C from the bottom mold 3 downward is prevented, which is more advantageous in integrating the concrete bottom slab 31 and the PC pile 11. Becomes

[0010]

As is apparent from the above description, the present invention is
A formwork for pile-head filling concrete that is attached to the head of a hollow concrete pile driven into the ground, and is a bottom mold that receives concrete poured into the space inside the concrete pile and poured into the space. A frame and an elastic member attached to the outer periphery of the bottom mold, contacting the inner peripheral surface of the concrete pile to close a gap between the outer periphery of the bottom mold and the inner peripheral surface, and the bottom mold. Since it is provided with a leg member that projects upward from the frame and has its upper portion locked to the upper end of the concrete pile to support the bottom formwork at a predetermined depth from the upper end of the concrete pile, when forming the concrete bottom slab, The head of concrete pile can be filled with concrete by simple work, and concrete bottom slab and PC pile can be surely integrated, improving the work efficiency of concrete foundation construction and reducing costs. It can be reduced to become.

[Brief description of drawings]

FIG. 1 is a cross-sectional front view of a pile head filling concrete formwork.

FIG. 2 is a plan view of a formwork for pile head filling concrete.

FIG. 3 is an explanatory view of a usage state of a concrete form for pile head filling concrete.

[Explanation of symbols]

 1 Formwork for pile head filling concrete 3 Bottom formwork 5 Leg member 7 Elastic member 11 PC pile 13 Space part 15 Inner peripheral surface G Ground C Concrete

Claims (1)

[Claims] 1. A formwork for pile-head filling concrete, which is attached to the head of a hollow concrete pile driven into the ground, and is inserted into a space inside the concrete pile and poured into the space. A bottom formwork that receives concrete, and an elastic member that is attached to the outer periphery of the bottom formwork and contacts the inner peripheral surface of the concrete pile to close the gap between the outer periphery of the bottom formwork and the inner peripheral surface. And a leg member projecting upward from the bottom formwork and having its upper part locked to the upper end of the concrete pile to support the bottom formwork from the upper end of the concrete pile to a predetermined depth. A characteristic formwork for pile head filling concrete.