JPS58168720A - Treatment of head of on-site pile - Google Patents

Abstract

PURPOSE:To simply and easily break the head of an on-site concrete pile by a method in which the concrete pile is placed on site, water is forcibly injected through a tremie tube penetrated to a higher level than the normal top of the pile, the tube is pulled up, and after the concrete hardens, the top concrete of the pile is broken. CONSTITUTION:Immediately after the placement of concrete for on-site pile, a tremie tube 5 is penetrated to a slightly higher level then the normal top 1 of the concrete, and water is forcibly injected into the concrete from a water charger 6 at the tip of the tube 5. Then, the tube 5 is gradually pulled up, the surrounding ground of the head of the pile is excavated after the concrete hardens, and the top part at higher level them the normal top 1 of the concrete is broken and removed. By this, the concrete can be simply and easily broken because the concrete in the place to be broken is brittle due to its high water content. Thus, labor required can be greatly reduced.

Description

[Detailed description of the invention] The present invention relates to a method for treating a pile head in a cast-in-place pile.

At, the concrete height of cast-in-place piles is 70% higher than the regular pile height.
After the concrete hardens, the pile is placed at a height of 0 to 1000 mm (m1)! The part above the regular pile height is crushed and removed using lt-control, but it requires the same amount of manpower as the demolition KFi and is apparently noisy.

This invention Fi, which was made based on the above circumstances, has a conc 1j-
The strength of
Its crushing is extremely easy and requires less human effort and Ik.
Some attempts have been made to provide a pile cap treatment method for cast-in-place piles that offers benefits such as reduction of f.

Hereinafter, this @light will be specifically explained based on the illustrated example of actual M1. First, the cast-in-place pile is removed, and the regular pile top 1 is placed in the pile hole 2, and the concrete 3 of the cast-in-place pile is placed. The main reinforcing bars 4 protrude upward from the pile top 1. This O-shape 9 is inserted into the tremie tube 5 from above into the pile hole 2. A water spray device 1116 is attached to the tremie tube 5 at its tip. The water discharging device has a radiating hole 6b extending in all directions from a central hollow ring 6a, and a large number of water discharging holes 6C are bored in the radiating hole 6b. In addition, the hollow ring body 6a
A sunny hose 7 communicating with the tremie tube 5 is disposed along the tremie tube 5. Then, with the water sprayer tg' lowered from the pipe located above the regular pile top l, water or a substance with the same effect as water, such as bentonite liquid, is forced into the water sprayer 6 via the sunny hose 7. The tray pipe 5 is rotated back and forth by 18 (f) while allowing the water to flow in and discharge from the water discharge hole 6c.As a result, a large amount of water or #'i is in the concrete above the regular pile top 1. In this state, the tray-pipe 5 is gradually moved upwards, and a large amount of water or the same effective substance is mixed into the concrete on the regular pile top 1. Contain.Water spray device 6
Wait for the concrete to solidify after pulling the bond through pile hole 2, excavate the area around the counter area i2!1, expose the area above the regular pile top 1, and crush and remove this part. In this case, the concrete IJ-concrete in this case has a high water content, which makes it miserable and fragile, so it can be easily and easily crushed, which saves a lot of input power, and can be operated with relatively little noise.

In this way, according to the present invention, immediately after concrete is placed on a cast-in-place pile, a tremie pipe is inserted using a regular concrete ceiling pipe at a high position, and water is released from a water spray device installed at the tip of the tray pipe. A liquid with the same effect as the concrete is forcibly injected into the concrete, the tremie pipe is gradually pulled up, and after the concrete hardens, the circumference of the pile head is excavated, and the concrete above the concrete is crushed (by crushing). Easy and convenient J+
1, it has the excellent effect of reducing noise and significantly reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a water spraying device showing an embodiment of the present invention, and FIGS. l...Pile heaven, 5...Treba one pipe, 6.
...Water spray device. Patent applicant Agent: Shimizu Corporation
Shodanshi Hideaki Sato the ffii''''+3 (measure 49 figure → 4 (invitation)

Claims (1)

[Scope of Claims] Immediately after pouring concrete into cast-in-place piles, a tremie pipe is inserted at a position slightly higher than the regular concrete height, and a water discharge device installed at the tip of the tremie pipe has the same effect as water ta#i. liquid【
A pile head treatment method for cast-in-place piles in which concrete is forcibly injected into the concrete, the tray pipe is gradually pulled up, and after the concrete hardens, the area around the pile head is excavated and the concrete above the concrete is crushed.