JPH0377325B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a method for reliably treating the pile head after placing concrete in the cast-in-place pile method, and
This invention relates to a head treatment tool for cast-in-place piles, which is intended to be carried out efficiently.

Conventionally, when constructing footing foundations on cast-in-place piles, as a pretreatment process, impurities that leaked from inside the pile and concentrated at the pile head were removed using a rock drill, etc. It takes time to work,
There is a risk of being injured by the reinforcing bars protruding from the pile head, which is irrational in terms of both workability and safety.

This invention has been made in view of the above-mentioned drawbacks and in order to solve them, and the structure thereof will be explained with reference to the drawings of the embodiments.

FIG. 1 is a front view showing one embodiment, and FIG. 2 is a plan view of FIG. 1.

Reference numeral 1' denotes a hollow body in which a plurality of through holes 3 are formed by a plurality of partition plates 2 extending radially from an inner ring part 101 toward an outer ring part 102, each of which is arranged independently. A plurality of threaded portions 4 are provided in the vertical direction.

Note that this hollow body is preferably made of synthetic resin, which has poor adhesion to concrete.

Further, it is better if the outer circumferential surface and the inner wall surface of the through hole are formed to have a draft angle.

5 is the upper outer ring portion 102 of this hollow body 1'.
The turnbuckle fittings 5c each have a hook bolt 5a screwed to one end and an eye bolt 5b screwed to the other end.

Reference numeral 6 denotes a mounting bolt that joins one end of the mounting arm 5 and the hollow main body 1'.

An example of the use of the pile cap processing tool 1 according to one embodiment configured as described above will be described below.

As shown in FIG. 3, the ground surface A is excavated in advance using a drilling bucket or the like, and after the casing tube B is driven in, the reinforcing bar cage C is inserted.

In this state, insert the pile head treatment tool of the present invention from above the casing tube B driven into the ground,
Adjust the mounting arm 6 whose one end is attached to the hollow main body 1' to be telescopic, and hook the hook bolt 5a at the other end to any vertical reinforcement C1 of the reinforcing bar cage C on the outer periphery, and tension it with the turnbuckle fitting 5C. to hang it in the desired position.

Next, a tremie tube (not shown) is inserted from the inner ring portion 101, and while pouring concrete through the tremie tube, the tremie tube is raised and filled to the required position (near the top surface of the hollow body 1'). do.
After that, before the concrete has completely cured, the mounting arm 6 is removed from the reinforcing bar cage C, and the casing tube B
Remove the pile head treatment tool from above.

In this way, after concrete is poured during pile cap removal work, the hollow body 1' can be easily pulled out, and after being pulled out, the concrete in the area where the pile cap has been removed can be vertically formed into a plurality of independent units. Therefore, it can be easily removed by hitting it with a hammer, etc., and the work can be done very efficiently and safely without any hassle.

In addition, concrete can be easily and reliably cast into the pile using the through hole 3 of the hollow body 1', which is rational, and the pile head processing tool can be reused, making it economical. be.

Regarding the structure of the mounting arm 6 and the means for connecting it to the reinforcing bar cage C, a pile cap processing tool can be incorporated at the same time when the reinforcing bar cage is assembled, and other holders and means may be selected. .

Figures 4 and 5 are a front view and a plan view illustrating another method for hanging the pile head treatment tool.
5 has long holes 25 near both ends of one continuous plate.
A is provided respectively, and the central part is formed into a concave shape,
This is a mounting arm having an insertion hole 25c in its bottom piece 25b.

Reference numeral 26 denotes a mounting bolt that rotatably connects the mounting arm 25 and the hollow main body 21.

The mounting arm 25 configured as described above has the sixth
As shown in the figure, both ends thereof are installed over the casing tube B and fixed with screw rods 27.

In this case, by pulling out the casing tube B after concrete placement, the pile head treatment tool can be removed at the same time, so the construction period can be shortened with less labor.

As described above, the treatment tool of the present invention can be easily installed inside the pile cap and can be installed reliably, so it has good workability and has great practical effects such as being able to be used for other purposes.

The pile head treatment tool of the present invention can also be attached by pushing the hollow body into the head of the casing tube immediately after pouring concrete into the casing tube.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the pile cap processing tool of the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a usage state diagram of the pile cap processing tool, and Fig. 4 The figure is a front view showing another form of the attachment arm, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is a diagram showing the use state of this other form. 1'...Hollow body, 3...Through hole, 5...Mounting arm, B...Casing tube, C...Rebar cage.

Claims (1)

[Claims] 1. A cast-in-place pile shaft consisting of a hollow body in which a plurality of through holes are formed by a plurality of partition plates extending radially from an inner ring toward an outer ring, each of which is arranged independently. Head treatment tool.