JPH04108910A - Method for processing pile head of sunk concrete pile - Google Patents

Abstract

PURPOSE:To shorten a work execution term and reduce the concerned cost by removing pile periphery fixing liquid filled in the hollow part of the head of a concrete pile by means of fluid spraying after the hollow ready-made concrete pile is inserted into a dug hole in which the pile periphery fixing liquid has been poured. CONSTITUTION:A fluid spray device 6 is placed on a pile 1. Then water is sprayed toward pile periphery fixing liquid 4 in a hollow part 1a to discharge the pile periphery fixing liquid 4 from the hollow part 1a. Further a reinforcing basket 8 is inserted into the space 7, thus obtained, of the head of the concrete pile 1, and concrete 9 is placed. Thus it is possible to remove the pile periphery fixing liquid 4 in the hollow part 1a extremely power-savingly and efficiently so that a work execution term can be shortened and the concerned cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for treating the head of a concrete pile sunk in an excavated hole containing soil cement.

(Problems to be solved by conventional technology and the invention) In recent years, concrete piles have been erected by filling a pile circumferential fixing liquid such as soil cement into a hole drilled with an auger to prevent pollution caused by noise and vibration. However, ready-made hollow concrete piles are sunk into the piles using their own weight or rotation.

For example, to explain the rotary milk root hardening method (Kemun-ae method), first, as shown in Figure 5, the auger 10
Using the auger 1, an excavation hole 2 with a diameter larger than the concrete pile 1 is formed up to the underground support layer while injecting a pile circumferential fixing liquid such as soil cement (Fig. 5 (a)).
0, inject the root hardening liquid 3 into the lower part, and inject the pile circumference fixing liquid 4 into the upper part (Fig. 5 (b)). Then, the auger 10 is removed, and as shown in FIG.
The concrete pile 1 is inserted and allowed to sink under its own weight or while being rotated, as shown in Figure 5 (d).

In Togoro, the piles sunk in the ground in this way are connected to the foundations of buildings, so the head of the piles is treated after being sunk. Several methods have been implemented for this treatment. - For boat fishing, a pile I
The lower part of the reinforcing cage that protrudes further upward is inserted and connected to the pile I with concrete, and the upper part of the reinforcing cage is buried in the foundation concrete of the building.

However, when the concrete pile 1 is sunk into the excavated hole 2 into which the pile circumferential fixing liquid 4 is injected, the pile circumferential fixing liquid 4 also fills the hollow part of the concrete pile and solidifies. Therefore, conventionally, the solidified pile circumferential fixing fluid that filled the hollow part of the pile head was excavated by hand or using an electric pick to the required depth and removed to form the insertion hole for the reinforcing bar cage. I have to. This work is extremely troublesome, requires a lot of labor, and is subject to time constraints, which has been a major problem in pile sinking.

The present invention was made in order to solve the problems mentioned in "2", and provides a method for easily and efficiently treating the head of a hollow concrete pile when it is sunk into an excavated hole filled with a pile circumferential fixing fluid. This is what we are trying to provide.

(Means for Solving the Problems) Regarding the structure of the present invention to achieve the objects stated in 2.
The present invention will be described with reference to FIGS. 1 to 4 showing embodiments. After inserting a hollow concrete pile l into an excavation hole 2 into which a pile circumferential fixing liquid 4 such as soil cement is injected, The pile circumferential fixing liquid 4 filled in the hollow head part Ia of the concrete pile 1 is removed by jetting fluid, and a hollow cavity 7 for inserting the reinforcing bar cage 8 is formed in the hollow head part of the concrete pile 1. It is characterized by this.

(Example) Examples of the method of the present invention will be described below with reference to FIGS. 1 to 4.

In Fig. 1, 2 is an excavation hole formed by an auger, into which a hollow ready-made concrete pile 1 is sunk,
The space between the pile I and the hole wall and the inside of the hollow part Ia of the pile I are filled with a pile circumferential fixing liquid 4 such as injected soil cement. This is the state at the end of concrete pile I sinking.

The present invention performs the head treatment of the concrete piles 1 that have been sunk. First, as shown in Figure 1, the pile 1
A pedestal 5 is installed on the second base, and a fluid injection device 6 is attached thereto with its nozzle directed into the hollow portion 1a of the concrete pile I. In this case, the rotary cap and rod used for sinking the concrete pile I can be used, and the fluid injection device 6 can be attached to the tip of the rod. Then, as shown in Figure 2, the pile circumference fixing liquid (slag) in the hollow part Ia
Spray water or air towards 4. Due to the jet flow, the pile circumference fixing fluid 4 is hollow f! It will be excavated, scattered and discharged from inside 1IIJIa as shown by the arrow. In this way, a cavity 7 of the required depth is formed in the head of the concrete pile 1, as shown in FIG. This will happen. Then, a reinforcing bar cage 8 is inserted into the empty space 7 as shown in FIG.
Concrete 9 is poured to connect concrete pile I and reinforcing bar cage 8.

A reinforcing bar cage 8 that protrudes above the concrete pile 1 is buried in the foundation concrete of the building, and is connected to the concrete pile 1.
and the building are firmly connected via the reinforcing steel cage 8.

” 1. Excavation of the pile circumferential fixing liquid 4 by fluid injection is performed using the fixing liquid 4.
After the fixative has hardened, a large injection pressure is required, so it is important to carry out the process immediately after the pile is sunk, when the fixative is still in a liquid state, or when it is in a semi-hardened or semi-fluid state. be.

Further, it is convenient to inject the fluid by providing a switching valve in the middle of the hose for injecting the fixing fluid used when sinking the concrete pile 1 and changing the connection to the fluid source.

(Effects of the Invention) As explained above, according to the present invention, when treating the head of a submerged pile whose hollow part is filled with pile circumferential fixing liquid (slag), the slag in the hollow part can be removed by fluid injection. ? Therefore, it is possible to perform the work extremely labor-savingly and efficiently without having to dig by hand or use an electric pick as in the past, which can shorten the period and reduce costs. etc., it has excellent effects.

[Brief explanation of the drawing]

Figures 1 to 4 illustrate embodiments of the method of the present invention, with Figure 1 being a cross-sectional view of the fluid ejecting device installed on a submerged desk, and Figure 2 being a cross-sectional view of the state during fluid jetting. , 3rd
The figure is a cross-sectional view showing the pile circumferential fixing liquid inside the pillow head removed, Figure 4 is a cross-sectional view of the state in which the reinforcing bar cage is connected inside the sleeper head, and Figures 5 (a) to (d) are conventional pile sinking methods. FIG. ■・Concrete pile 2 ・Drilled hole 4・Pile circumference fixing fluid 6 Fluid injection device 7・Vacancy
8.Reinforcement cage (inner diagram (b) (c) (d)

Claims (1)

[Claims] In the excavation hole, a pile circumferential fixing liquid such as soil cement was injected.
After inserting a hollow pre-made concrete pile, the pile circumferential fixing liquid that is filled in the hollow head of the concrete pile is removed by fluid injection, and a cavity for inserting a reinforcing bar cage is created in the hollow head of the concrete pile. A method for treating the head of a sunken concrete pile, the method comprising: forming a bed head of a sunken concrete pile;