JPH06272243A - End ground processing method for concrete pile and jig therefor - Google Patents

Abstract

PURPOSE:To simply apply the required bearing power to a pile tip section by intruding the pyramid member of a jig arranged on the end ground of a cast-in-place concrete pile into the ground while applying the vertical vibration and load. CONSTITUTION:A wide member 3 is fixed at the tip of a vertically long vibrating main member 2, and a tapered pyramid member 4 is removably arranged at its tip to form a jig 1. The jig 1 is arranged at the end ground of a cast-in-place concrete pile, the vertical vibration and load are applied to the jig 1, and the pyramid member 4 is intruded into the end ground. The vibrating main member 2 and the wide member 3 are lifted after the intrusion, and the pyramid member 4 is left in the end ground. The concrete pile end ground is compacted, the ground rigidity is increased, and sufficient bearing power is exerted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating the tip ground of cast-in-place concrete piles and a jig therefor.

[0002]

2. Description of the Related Art Conventionally, cast-in-place concrete piles have been constructed by drilling a vertical hole in the ground by the earth drill method, all casing method, reverse circulation method, etc. It is a construction method to create piles, but at that time, during the hole excavation process,
Around the hole, especially at the tip of the load supporting point, the soil at the tip loosens and the supporting force decreases, and if concrete is placed without compacting the ground, the rigidity of the tip soil of the cast-in-place concrete pile is small, Deformation until reaching the ultimate supporting force becomes large, and as a result, the tip supporting force is evaluated as small.

[0003]

Therefore, the present invention is
(EN) It is an object to provide a method for easily applying a required supporting force to the tip of a cast-in-place concrete pile and a jig therefor.

[0004]

The gist of the present invention is the first aspect.
In the tip ground of the cast-in-place concrete pile, a jig having a tapered pyramid member at the tip portion is arranged, and by applying longitudinal vibration and load to the jig, the pyramidal member is penetrated into the tip ground, After that, the method of treating the tip ground of cast-in-place concrete piles, which consists of leaving the pyramid member in the tip ground,
Secondly, in the jig used for the method for treating the tip ground of the cast-in-place concrete pile, the vertically long vibration main material, the wide member fixed to the tip of the vibration main material, and the front and the rear of the wide member can be freely attached and detached. A jig provided with a tapered pyramidal member arranged.

The present invention will be described in detail below with reference to the drawings.

First, the jig 1 of the present invention will be described with reference to FIGS. FIG. 1 shows a state in which each member is connected. Here, 2 is a vertically long vibration main material, 3 is a wide member, and 4 is a pyramidal member.

The vibrating main member 2 is made of a vertically long columnar member such as a column or a square column, and may be solid or tubular, but the latter is preferable. In the case of the tubular vibration main material 2, a plurality of holes 5 are
Is preferably provided. Thereby, when the jig is inserted into the hole, even if the ground stabilizing solution such as water injected into the hole is filled, the buoyancy acting on the jig becomes small and the insertion becomes easy. Further, the solid vibrating main material 2 is suitable when the weight of the entire jig is increased and used as described later. During use, the vibration main member 2 is applied with vertical vibration and load by an appropriate mechanism. As a method of applying such a vertical vibration and a load, for example, a method of applying vibration to a jig having a sufficient weight, a method of using a vibration device and a press-fitting device in combination, and the like can be adopted. . When carrying out the former method using the tubular vibration collecting material 2, a method of filling the vibrating main material 2 with a heavy object such as crushed stone, a method of installing the heavy object at an appropriate position of the vibrating main material, etc. Take measures.

The vibrating main material 2 may be a vibrating body inside or outside.

The wide member 3 is a member having a wide width in the lateral direction, such as a square plate, preferably a disc, fixed to the tip portion (downward) of the vibration main member 2 by welding or the like, and its shape is a concrete pile. It is preferable to correspond to the shape. Wide member 3
Is for preventing the ground from rising due to the pyramidal member 4 penetrating the tip ground in the concrete pile. It is preferable that the wide member 3 is provided with a plurality of small holes 6 as escape paths for the water flow so that the wide member 3 can be smoothly inserted into the hole.

The pyramidal member 4 is a pyramid base material such as a triangular pyramid, preferably a quadrangular pyramid, which is removably arranged in front of the wide member 2. The pyramidal member 4 may be solid or hollow, but the outside is An iron plate having concrete, mortar or the like filled therein is preferable. The pyramidal member 4 must sufficiently withstand the vibration and load when it penetrates into the tip ground.

FIG. 2 shows a state in which the pyramidal member 4 is separated. A screw 8 to be inserted into a screw hole 7 provided in the wide member 3 is integrally provided at a rear central portion of the pyramid member 4.

FIG. 3 is a view taken along the line AA of FIG. The small holes 6 provided in the wide member 3 are preferably evenly distributed in the member.

Next, with reference to FIG. 4, the tip ground processing method of the present invention will be described.

That is, the vertical hole is excavated while injecting the stabilizing solution, and after the excavation is completed, the primary slime treatment is carried out (a). Then, as shown in FIG. 4B, the jig 1 is inserted into the hole,
After confirming that the tip of the jig has reached the pile tip ground by measuring, vibration and load are applied. As a result, FIG.
As shown in (c), the pyramidal member 4 penetrates into the tip ground. The degree of penetration is confirmed by measuring the vibration main material 2. After sufficiently penetrating the pyramidal member 4, by rotating the vibrating main material 2 in the direction opposite to the screw 8 of the pyramidal member 4, the vibrating main material 2 is separated from the pyramidal member 4 held by the resistance with the ground, As shown in FIG. 4D, the pyramidal member 4 is left in the tip ground and the vibration main member 2 and the wide member 3 are pulled up. The number and position of the pyramidal members 4 left on the tip ground are
Select as appropriate according to pile diameter and ground conditions. In this way, the concrete pile tip ground on which the pyramidal member 4 is left is compacted, the ground rigidity is increased, and a sufficient supporting force is provided. Needless to say, this treatment method can also be applied to the tip bottom expanding method (indicated by a chain line in FIG. 4).

After that, according to the usual construction method, work such as rebar installation, tremie pipe installation, secondary slime treatment, concrete placing, etc. is performed.

[0016]

According to the present invention, regardless of the diameter, shape, ground condition, etc. of cast-in-place concrete piles, a sufficient supporting force can be easily applied to the tip ground. As a result, the tip supporting force can be greatly evaluated.

[Brief description of drawings]

FIG. 1 is a side view of a jig of the present invention.

FIG. 2 is a side view showing a state where the pyramidal member of the jig of the present invention is separated.

FIG. 3 is a view on arrow AA of FIG.

FIG. 4 is a diagram illustrating a tip ground processing method of the present invention.

[Explanation of symbols]

 1 jig 2 vibration main material 3 wide member 4 pyramid member 5 hole 6 small hole 7 screw hole 8 screw 9 stabilizing liquid

Claims (2)

[Claims] 1. The tip ground of cast-in-place concrete piles,
A jig having a tapered pyramidal member at the tip is arranged, and the pyramidal member is allowed to penetrate into the tip ground by applying a longitudinal vibration and load to the jig, and thereafter the pyramid member is left in the tip ground. Method for soil treatment of cast-in-place concrete piles. 2. A jig used in the method for treating the tip ground of a cast-in-place concrete pile according to claim 1, wherein the vertically long vibration main member, the wide member fixed to the tip of the vibration main member, and the detachable member on the front side of the wide member. A jig with a tapered pyramidal member that is freely arranged.