JPS6030714A - Treatment of head of cast-in-place pile - Google Patents

Abstract

PURPOSE:To facilitate the removal operation of the head of a pile without generating dust and noise by a method in which a reinforcing bar shield device is brought down, the upper part of reinforcing bars is inserted into the space between inner and outer cylinders, and concrete is placed in such a way as to avoid the adherence of concrete to the upper part of the reinforcing bars. CONSTITUTION:A reinforcing bar shield device 1 is brought down, the upper part of reinforcing bars 18 is inserted between inner and outer cylinders 3 and 4, and a concrete-pouring tube 14 is inserted into the center of the device 1. Concrete is placed into a formwork 17 through the tube 14. Since no air is present the space between the inner and outer cylinders 3 and 4, concrete does not come in from below and concrete does not adhere to the upper part of the reinforcing bars 18. Before the concrete hardens, the formwork 17 is pulled off, and after the concrete hardens, the device 1 is lifted up. By breaking a constricted portion E formed by the guide 13 of the device 1, the head D of the concrete pile is removed out.

Description

[Detailed description of the invention] This invention relates to a method for treating pile heads.

Conventional pile cap processing involves excavating around the pile α with a power shovel to expose the pile cap hf, as shown in Figure 1 A, and removing the pile cap b.
The concrete was broken by playing force, and the crushed concrete pieces were lifted up by a CF crane (see Figure 1 C, 2, and H).

In this case, the machinery required is a power shovel, a play force, and a compressor, and two workers (one set) are required.
was necessary.

It takes about 43 piles α to build one mansicon, and it takes about 43 piles α.
It took eight workers, several days of labor, and hundreds of thousands of yen to remove the pile heads. For the past 10 days, they were unable to do any other work and had to do most of their work on clearing the pile heads, and the workers were also forced to work hard due to the heavy noise and dust caused by the breaker work.

The present invention has been developed in consideration of the above circumstances, and its purpose is to eliminate the need to crush the pile cap with a breaker, eliminate the need for a breaker and compressor, and eliminate the generation of dust and noise. To provide a pile cap processing method for cast-in-place piles that allows easy pile cap removal work.

Hereinafter, the present invention will be explained with reference to FIG. 2 and subsequent figures. 1 in the drawing is a reinforcing bar shielding device, and this reinforcing bar shielding device 1
As shown in Figures 5 to 7, the shield block 2 is
The pieces are combined to form a cylindrical shape.

The shield block 26 has a half-split inner and outer cylinder body 3.4. A half-shaped upper ring plate 5 is fixed to the upper end of A, and a plate 6 is fixed to the divided ends of the inner and outer cylinders 3 and 4. , 4 has a half-split lower ring plate 7.
A plurality of circumferentially long long holes 8 are formed in the lower ring plate 7 in the circumferential direction, and these constitute a reinforcing bar insertion part F. The upper end of the plate 6 projects upwardly from the upper ring plate 5, and this projecting portion 9
A hole 10 is provided in the hole 10, and these constitute a hook portion 22.

Further, the upper ring plate 5 is provided with a protrusion 11 made of a plate, and the protrusion 11 is provided with a hole 12.
These constitute the hook portion 22.

Reference numeral 13 in the drawings indicates a guide member having a wedge-shaped cross section.

Further, 14 is a concrete pouring pipe.

Next, the operation will be explained. A hole 16 is excavated in the ground 15 and the frame 17 is inserted into the hole 16.

A plurality of reinforcing bars 18 are arranged on the frame 17 at predetermined intervals in the circumferential direction.

The reinforcing bar shielding device 1 is constructed by aligning shield blocks 2 with a plate 6 and connecting both shield blocks 2 with bolts 20 installed in bolt holes 19 on the outside of the plate 6. The guide member 13 is attached to the elongated hole 8' (i).

The reinforcing bar shielding device 1 configured as described above is hung from the hook part 22 with a wire using a hanging machine such as a crane, and is lowered through the elongated hole 8 to attach the upper metal circle of the reinforcing bar 18, the outer cylindrical body 3,
Insert between 4.

Then, the concrete pouring pipe 14 is inserted into the center of the reinforcing steel shield device 1. In this state, concrete is poured into the frame 17 from the concrete pouring pipe 14, and concrete pouring is continued while the concrete pouring pipe 14 is raised. Concrete rises and reinforcing steel shield device 1
The inside of the inner cylindrical body 3 and between the outer cylindrical body 4 and the frame 17 are filled. In this case, since air is present in the space B between the inner and outer cylindrical bodies 3.4, concrete will enter from below, so that concrete will not adhere to the upper part of the reinforcing bars 18.

Further, impurities in the concrete flow upward by the guide member 13 as shown by arrows in FIG.

Then, the frame 17 is pulled out before the concrete hardens. After waiting for the concrete to harden, remove the pile head portion Df of the concrete pile C by lifting the reinforcing steel shield device.

In this case, a constriction E is created in the concrete pile C by the guide member I3, so the pile cap is separated from this constriction E.

What is shown in FIGS. 8-9 is another embodiment of the present invention.

This reinforcing steel shield system [1 is made by fixing a plurality of pipes 20 to a ring plate 5 at predetermined intervals to constitute a shield block 2, and bolting the two shield blocks 2 together. .

Holes 21 are formed in the frame 17 in the circumferential direction.

Therefore, the reinforcing bar shield device 1 is lowered and inserted into the upper part of the reinforcing bar pipe 20, and in this state, concrete is placed inside the frame 17, and the roots are cut after waiting for the concrete to harden. , drive a wedge 23 through the hole 21 to separate the pile cap portion Dtl from the concrete pile C. In this state, lift the reinforcing bar shield device l't and remove the pile head portion of the concrete pile C.

As described in detail above, the present invention provides a reinforcing bar shield device 1 having a reinforcing bar insertion portion Ff whose upper end is closed and swollen and whose lower end is open.
is suspended, the entire upper part of the reinforcing bar 18 is inserted into the reinforcing bar insertion part F, and concrete is poured to form a concrete pile C.
Cut the concrete pile C at the lower blade part of the reinforcing bar insertion part F,
This concrete pile pile cap processing method is characterized in that the reinforcing bar shield device 1 is lifted to remove the pile cap portion Df from the concrete pile C.

Therefore, by lifting the reinforcing bar shield device 1, only the pile cap portion can be removed while leaving the reinforcing bar 18 as it is, so there is no need to crush the pile cap portion with the Df breaker, which not only eliminates the need for the breaker and compressor, but also eliminates dust. , Pile head removal work can be carried out easily without generating noise.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional pile cap processing force method for cast-in-place piles, and FIG. 2 is an explanatory diagram of a pile cap processing method according to an embodiment of the present invention.
Figure 3 is a sectional view along the second drawing direction, Figure 4 is a view taken from the second drawing direction, Figure 5 is a partially omitted plan view of the reinforcing bar shielding device, and Figure 6 is Figure 5M. - A sectional view taken along the line Vl, FIG. 7 is a view taken from the direction of the second drawing, FIG. 8 is an explanatory view of another embodiment of the present invention, and FIG. 9 is a view taken from the direction of the second drawing. , FIG. 10 is a view taken from the direction of arrow X in FIG. IVi reinforcing bar shield device, 18Fi reinforcing bar, C is concrete pile, D is pile cap, F is reinforcing bar insertion part. Applicant Komatsu Manufacturing Co., Ltd./"1 Matsu Construction Industry Co., Ltd. Agent Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto 91i, t, etc.)"5 r op, ::7

Claims (1)

[Claims] A reinforcing bar shield device 1 having a reinforcing bar insertion part F with a closed upper end and an open lower end is suspended, the upper part of the reinforcing bar 18 is inserted into the reinforcing bar insertion part F, and concrete is placed to form a concrete pile C. A pile cap treatment for a concrete pile characterized in that the concrete winter pile Cf is cut at the lower part of the reinforcing bar insertion part F and the reinforcing bar shield device 1 is lifted to remove the pile cap from the concrete pile C. Method.