JPH0462224A - Pile head processing method for cast-in-place concrete pile - Google Patents

Abstract

PURPOSE:To enhance workability by providing a cast concrete section for reinforcing a pile head section, with a plurality of excavation holes, inserting hydraulic drive crushers into the excavation holes, injecting pressure liquid into the crushers and applying a pressure to the injected pressure liquid. CONSTITUTION:Through a section with a level equal to or higher than the design level of a cast concrete section 2 for reinforcing a pile head section, a plurality of excavation holes 3 are bored, and into the holes 3, hydraulic drive crushers 4 are inserted to be connected to a hydraulic control equipment 5 via high pressure hoses 6. After that, on the outer peripheries of the rubber tubes 9 of the crushers 4, hard rubber wedges 10 are arranged, and on the outer peripheral surfaces of the wedges 10, steel loading plates 11 are fitted integrally and firmly to be formed. After that, when liquid is injected into the tubes 9 of the crushers 4 from the hydraulic control equipment 5 via the hoses 6, and is pressure-applied, then pressure is applied to the inner peripheral surfaces of the holes 3, and crack 12 is generated, and edges between the concrete section 2 and a pile main-body section 1 are separated from each other, and attachment between the sections 2, 1 and a pile reinforcing-bar 7 is broken.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for treating a pile head of a cast-in-place concrete pile.

(Prior Art) When dismantling the additional concrete portion of a cast-in-place concrete pile, a method has conventionally been adopted in which the cutter uses a breaker to cut the pile up to the planned height.

In addition, a static destruction method has been developed that uses the expansion force generated by the chemical reaction between raw coal and water to destroy the pile head.

(Case B that the invention seeks to solve) However, in the former method of using a breaker, pollution problems arise due to noise, vibration, dust, etc. due to long-term use of the breaker, and it also poses a problem in terms of worker safety and hygiene. There's a problem.

In addition, the work space is narrow, reducing construction ability, and it takes a lot of effort and time to turn down work. Furthermore, there are individual differences in work time depending on the level of skill of the refuse worker.

In addition, the latter method, which utilizes the expansion power of raw coal, is expensive, takes time to develop expansion power, and furthermore, the expansion power due to chemical reaction is not uniform.

The present invention has been proposed in view of the problems of the prior art, and its purpose is to improve workability, shorten construction period, and improve safety on the pile head of cast-in-place concrete piles. The point is that it provides a processing method.

(Means for Solving the Problems) In order to achieve the above object, according to the method of the present invention, a plurality of excavated holes or pipes are set in the concrete portion of the head of the cast-in-place concrete pile, and then A hydraulic crushing device is inserted into the excavation hole or pipe, and then pressurized fluid is injected into each crushing device to pressurize it.

(Function) According to the present invention, as described above, pressurized fluid is injected into a plurality of excavated holes provided in the reinforced concrete portion of the head of a cast-in-place concrete pile or into a hydraulic crushing device inserted into a pipe. Pressure is applied to the additional concrete part of the head of the pillow from the inner circumferential wall of the excavated hole or pipe by a crushing device, and cracks are generated between adjacent excavated holes or between the vibrations in the additional concrete part, and the additional concrete part is At the same time, the adhesive force between the pile reinforcing bars and the additional concrete part is cut off, and the concrete of the pile main body and the entire additional concrete part that has been cut off from the pile reinforcing bars are removed at once. It's Uruchino.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(^) is a cast-in-place concrete pile, (1) is the concrete pile itself, and (2) is the additional concrete part.

A plurality of excavated holes (3) are drilled above the design height in the additional concrete portion (2) (see Figures 1 and 4), and then a hydraulic crushing device (4) is installed in each of the excavated holes (3). ) and connect it to the hydraulic pressure control unit (5) via the high pressure hose (6). (See Figure 2) In the figure, (7) is the pile reinforcing bar, and (8) is the concrete fitted to the pile reinforcing bar (7) in the additional concrete section (2), and a tube such as a vinyl tube that cuts through the greenery. be.

The hydraulic crushing device (4) is constructed by disposing a hard rubber shaft on the outer circumference of a rubber tube (9) and integrally fixing a steel loading plate OD to the outer circumferential surface of the wedge (00). .

As the hydraulic crushing device (4), the one described in Japanese Patent Application No. 63-266183 proposed by the present applicant is used, and detailed explanation thereof will be omitted.

Moreover, instead of the excavation hole (3), a pipe may be attached to the reinforcing bar cage in the additional concrete portion (2).

Then, the high pressure hose (6) is connected to the hydraulic pressure control unit (5).
) of the hydraulic crusher (4) via the rubber tube (
9), when fluid is injected and pressurized, the inner circumferential surface of the excavation hole (3) or pipe is pressurized via the hard rubber 1MOω and the loading plate 00, thereby increasing the adjacency in the additional concrete portion (2). Cracks (lz) occur between the excavated holes (3) or between the pipes, and the edge of the additional concrete part (2) and the concrete of the pile body (1) is cut, and the adhesion to the anti-reinforcing bars (7) occurs. is cut off.

In this way, the pile body concrete (1) and the pile reinforcement (7)
The entire reinforced concrete part (2) with the green cut part (2) is lifted up at once and the same part (2) is removed. (See Figure 3) A breaker is used for secondary crushing and finishing.

(Effect of the invention) As described above, in the present invention, a plurality of excavated holes are provided in the concrete part of the head of the cast-in-place concrete pile, pipes are set, and a hydraulic crushing device is installed in the excavated holes or pipes. By inserting the concrete and pressurizing it by injecting pressurized fluid, it cuts the edge between the additional concrete part and the concrete of the pile body, and also cuts off the adhesion between the pile reinforcing bars and the additional concrete part, thus removing the additional concrete part at once. By removing the dust, the head can be processed pollution-free without generating noise, vibration, or dust, which significantly improves work efficiency.
This can shorten the construction period and improve worker health and safety.

[Brief explanation of the drawing]

1 to 3 are longitudinal cross-sectional views showing steps of an embodiment of the method for treating the head of cast-in-place concrete piles according to the present invention; FIG. 4 is a cross-sectional plan view of the head portion of FIG. 1; The figure is a vertical side view showing the details of the hole drilling part in Figure 2, and Figure 6 is a vertical side view showing the details of the hole drilling part in Figure 2.
It is an arrow Vl-V1 view of the figure. (A)...Cast-in-place concrete pile. (1)... Pile main body concrete (2)... Additional concrete part (3)... Excavation hole, (4)... Hydraulic crushing device (5)... Hydraulic pressure control unit (6 )...High pressure hose (7)...Pile reinforcement.

Claims (1)

[Claims] A plurality of excavated holes or pipes are set in the concrete part of the head of a cast-in-place concrete pile, and then hydraulic crushing devices are inserted into the excavated holes or pipes, and then pressurized fluid is injected into each of the crushing devices. A method for treating a pile head of a cast-in-place concrete pile, which comprises applying pressure to cut the edge between the additional concrete part and the concrete of the pile body, and also to break off the attachment to the pile reinforcing bars.