JPS5880020A - Treating method for head of in-place pile - Google Patents

Abstract

PURPOSE:To eliminate the need for a chipping work for concrete piles by a method in which a curing ring for extra-banking concrete is provided on the upside of an iron bar cage, and the extra-banking concrete being placed is removed before the concrete hardens. CONSTITUTION:A curing ring A is inserted into the upside of an iron bar cage B, a coupling metal 2 is coupled with the hoop bar of the iron bar cage B, and the iron bar cage B is hung down into an excavated pit C. Then, concrete 4 is placed into the excavated pit C, a bucket 5 is inserted into the curing ring A while being turned before the concrete hardens, and the bucket 5 is pulled out to remove an extra-banking concrete inside the curing ring. After the curing ring A is pulled out, the surrounding ground of the pile is excavated and the remaining extra-banking concrete is cut off.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a pile cap for cast-in-place piles that can save labor, prevent noise, reduce construction costs, and prevent deterioration of pile performance due to grinding work in concrete pouring work. This is a proposed treatment method.

In general, for cast-in-place piles in which pile concrete is cast in bentonite mud, it is necessary to ensure the quality of the concrete at the pile head and improve connectivity with the building base, so the concrete is deformed by approximately 1,000 tll from the top of the set pile. After overfilling is carried out and the concrete reaches the required strength, the remaining concrete is ground down using a jackhammer.

However, with this method, the entire amount of excess concrete is ground after the concrete has hardened, so the noise associated with the prayer work is large, and the removal of the ground debris often relies on manual labor, which reduces both construction time and construction costs. It is disadvantageous.

The bed head processing method according to the present invention has been developed to eliminate these conventional drawbacks, and inside the upper part of the iron am inserted into the excavation hole, the inner diameter of the iron 6 ball is slightly smaller than that of the iron am,
and pouring concrete with a foreshadowing line to which a steel plate curing ring with a vertical length corresponding to the concrete reinforcement thickness is attached, and before the concrete hardens, the packet is rotated and inserted into the curing ring, The extra concrete in the curing ring is removed with the packet, and then 1lli
The feature is that the J-curing ring is removed and the remaining concrete is polished off.

Hereinafter, an example of the development of the present invention will be explained based on the figures.

FIG. 1 shows an example of a steel plate curing ring A used in the pile cap treatment method for cast-in-place piles according to the present invention.

Is this curing ring A the iron of the pile described later? f Slightly smaller diameter than the inner diameter of JBE, and corresponding to the concrete reinforcement thickness, h upper length l100 OK front f! It has a cylindrical shape with openings at both ends, and has a hanging metal fitting 1 on the bottom end, and a locking metal fitting 2 on the outer surface that engages with the hoop muscle of @0neB from above.・ are attached to each.

The pile cap treatment method using the above-mentioned curing ring A is as follows.

That is, as shown in FIG. 2(a), the curing ring A is inserted inside the upper part of the reinforcing bar B, and the locking fittings 2 are locked to the hoops 6 of the iron EhHE. Either suspend Sashima B into the borehole C or insert iron EfJ- into the borehole C.
After suspending B, insert the curing ring A into the upper part of #1kEIJ-B, and attach it with the latches A2 in the same way as above. In the figure, it is 3IIi bentonite muddy water.

Next, as shown in FIG. 2(B), underwater concrete 4 is poured into the excavated hole C sequentially upward from the bottom using a tremie pipe (not shown). In this case, if necessary, immediately before concrete pouring, a water jet is injected at the bottom of the excavation hole C in the pressure pipe (not shown) to stir up the untreated Sufiim and the Surim that has settled after treatment and make them float. put. In the figure, P is the top of the set pile, and H is the thickness of the extra concrete.

Then, as shown in No. 21 (c), while the concrete 4 is still uncured, that is, in the darkness of JO-40 minutes after the completion of concrete pouring, the packet 5 is rotated and placed inside the curing ring A. By inserting and pulling out the packet 5, the extra concrete in the curing ring A is removed, as shown in FIG. 2). This work is done before the extra concrete hardens, so no noise is generated. The removed excess concrete will be reused as waste concrete to be placed on electrical equipment tracks, etc. Furthermore, since the packet 5 is rotated within the curing ring A, the packet 5 does not collide with the iron 6-B, and deformation and damage to the pile and hoop components can be prevented.

After that, the curing ring A is removed as shown in FIG. 2 (e). If too much time has passed since the concrete was placed, it will be difficult to remove the curing ring A, so this work should be done as soon as the concrete piles have matured to the point where they can stand on their own, or sooner. shall be taken as a thing.

After all the piles have been counted and the steps described are completed, the ground around the piles is excavated to a predetermined depth as shown in Figure 2 (f), and the remaining concrete is removed by IJR. This work is to be done after the extra concrete has hardened, but since only a small amount of extra concrete remains along the iron 6-gap B, it can be easily done in a short time. Noise generation can also be minimized.

Incidentally, if the pipe in charge of the pile is fitted with a pipe that prevents it from adhering to the concrete in a removable head, it will be easier to grind the remaining excess concrete. Also,
By making the curing ring A have a structure that can be reduced in diameter or divided into pieces, the above-mentioned removal operation of the curing ring A can be performed more easily. As the packet 5, one with a special structure manufactured for removing excess concrete may be used, but an excavation packet can be used as is.

As described above, according to the construction method of the present invention, the excess concrete in the curing ring is removed with a packet while the excess concrete is not hardened, and after the curing ring is removed, the remaining excess concrete is This makes rJIr work and removal of the grinder easy, reducing construction costs. Noise generation can also be kept to a minimum. It can be effectively re-used as waste concrete for pouring on runways, etc.

Further, since the packet is rotated within the curing ring, the packet does not collide with the iron 61m, and deformation and damage to the pile main shaft, hoop reinforcement, etc. can be prevented.

[Brief explanation of drawings]

1 shows an embodiment of the present invention, FIG. 1 is a perspective view of a curing ring made of a steel plate, and FIGS. 2(A) to 2(F) are process diagrams. A... Steel plate curing ring, B... Iron 6-1 C.
...Concrete, 5...Packet. Part (c) (2) (ne) (f)

Claims (1)

[Claims] Iron IN inserted into the borehole? On the inside of the upper part of the in, there is a steel plate that has a slightly smaller inner diameter than the reinforcing bar ura, and has a length of 1 mm that corresponds to the thickness of the concrete reinforcement! Concrete is poured with a foreshadowing to which curing is attached, and before the concrete hardens, a packet is inserted into the curing ring while rotating, and excess concrete in the curing ring is removed with the packet. A pile cap processing method for cast-in-place piles, which is characterized in that, after that, the curing ring is removed and the excess concrete of ab is removed.