JP2517948Y2 - Pile head processing equipment for cast-in-place foundation piles - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pile head treatment of a cast-in-place foundation pile, and to a technique for inhibiting hardening of concrete in the extra portion of the hole head that will be removed later.

[Conventional technology]

Pile head treatment of cast-in-place foundation piles, that is, treatment of the extra pile, is mainly performed by removing the extra pile after hardening by "chipping" using a breaker or the like.
However, such a treatment method causes a large amount of noise or produces a large amount of concrete pieces that have been picked up, which causes problems such as deterioration of working environment, noise pollution, and increase of industrial waste.

For this reason, a technique has been developed in which water is poured in an uncured state to prevent the hardening of the concrete only in the extra portion. According to this technology, the cement component is removed from the surplus portion by pouring water in the uncured state of the concrete, so it is possible to remove the aggregates such as sand and gravel after the other portion is cured. Partial treatment can be performed, and pile head treatment can be performed without generating pollution factors such as noise and industrial waste.

For example, JP-A-52-93107, JP-A-55-78715, and JP-A-SHO
The technology disclosed in each publication such as 58-191815 is an example. However, in these conventional techniques, there is a problem in practicability that the device for water injection has to be very large and the work efficiency is poor.

[Problems to be solved by the device]

The present invention has been made against such a background,
It is an object of the present invention to provide a pile head treatment device capable of efficiently performing pile head treatment by water injection as described above with simple equipment.

[Means for solving the problem]

The pile head treatment device according to the present invention is a pile used for injecting high pressure water into the extra pile portion of the pile head of a cast-in-place concrete pile in a state where the concrete has not yet hardened, and inhibiting the hardening of the extra pile portion. It is a head treatment device, and is equipped with a water pipe having a length that can be inserted to the bottom part in the extra portion, and a rotary nozzle is provided at the tip of this water pipe, and this rotary nozzle has a plurality of discharge ports on the side surface. And is connected to the tip of this rotating part and a rotating part that is made to rotate the high pressure water supplied through the water supply pipe from each of these discharge ports to the surroundings and is rotated by the discharge reaction force of this high pressure water. , A propulsion unit adapted to generate forward thrust as the rotary unit rotates in uncured concrete.

[Action]

This pile head processing device is used in Japanese Utility Model Application No. Sho 62-130087 (Actual Kaihei 1-3
No. 6087) is an application of the rotary nozzle for high-pressure water discharge in an in-pipe washing machine separately proposed by the inventor of the present application, and the point that the rotary part of the rotary nozzle rotates at high speed due to the reaction force due to discharge of high-pressure water. It is effectively used as a water injection type pile head treatment device. That is, a propelling unit that rotates together with this rotating unit is connected to a rotating unit that rotates by discharging high-pressure water, and this propelling unit generates forward thrust by rotating in uncured concrete. The rotary nozzle is provided with a self-propelling force, and the self-propelling force allows the rotary nozzle to easily enter the extra portion.

In this way, by making the rotary nozzle enter the extra portion with the help of the self-propelling force, it becomes possible to efficiently perform the work of repeatedly putting the rotary nozzle in and out of the extra portion with simple equipment. As a result, pile head treatment by water injection can be efficiently performed with simple equipment.

[Embodiment] An embodiment of the present invention will be described below.

FIG. 1 is a simplified overall side view of a pile head processing apparatus according to this embodiment. In the figure, 1 is a water supply port 1a and a pressure gauge.
A water tank having 1b and a relief valve 1c, 2 is a water supply pipe, and 3 is a rotary nozzle.

FIG. 2 is an enlarged sectional view of the rotary nozzle 3, and FIG. 3 is a plan view seen from the direction of arrow DA in FIG. In the figure, 4 is a connecting part for connecting to the water supply pipe 2, 5 is a rotating part, and 6 is a propulsion part. The rotating part 5 is formed in a hollow bell shape having about 2 to 3 discharge ports 7 with its side wall penetrating obliquely backward, and is rotatably supported by the connecting part 4 via a belling 8. . In addition, the promotion unit 6
It is formed in a rod shape, and is fixedly connected to the spherical arc-shaped tip of the rotating portion 5 in a direction intersecting the axis of the rotating portion 5.

FIG. 4 is an explanatory diagram of a usage state of the pile head processing device. When the pile head processing device is hung with the suspending tool 10 using a wire or a chain above the concrete formwork 9 of the cast-in-place foundation pile, and when ready-mixed concrete is driven into the concrete formwork 9, The pile head treatment device is gradually lowered to allow the rotary nozzle 3 to penetrate into the uncured concrete 11. When the rotary nozzle 3 slightly enters the concrete 11, the high pressure hose 12 is used for the pile head treatment device, for example 100
High-pressure water of up to 200 kg / cm ² is supplied at a rate of 25 to 50 liters per minute, and this high-pressure water is discharged from the discharge port 7 of the rotary nozzle 3 to the surroundings.

The high pressure water is discharged from the discharge port 7 so that the rotary nozzle 3
The rotating part 5 rotates at a high speed as indicated by an arrow X in the figure, and a forward thrust is generated by the propelling part 6 rotating together with the rotating part 5, and the forward thrust causes the rotary nozzle 3 to move into the concrete 11. High pressure water can be injected along the entire height direction of the extra part. When such water injection is continued by moving the rotary nozzle 3 up and down several times, most of the cement content in the concrete flows out from the concrete formwork 9 together with the water, thereby leaving the extra portion to be the aggregate only. be able to. Note that the reference numeral 13 is a reinforcing bar.

[Effect of device]

According to the present invention, pile head treatment by water injection can be efficiently performed with simple equipment, and it is possible to implement practically the pile head treatment technology by water injection.

[Brief description of drawings]

FIG. 1 is a simplified overall side view of a pile head treating apparatus according to the present invention. FIG. 2 is an enlarged sectional view of the rotary nozzle. FIG. 3 is a plan view seen from the direction of arrow DA in FIG. FIG. 4 is an explanatory diagram of a usage state of the pile head processing device. 2 ... Water pipe 3 ... Rotating nozzle 5 ... Rotating part 6 ... Propulsion part 7 ... Discharge port

Claims (1)

(57) [Scope of utility model registration request] 1. A pile head treatment device used for pouring high-pressure water to a pile head portion of a foundation pile made of cast-in-place concrete in a state where the concrete is uncured to inhibit hardening of the extra pile portion. , Equipped with a water pipe having a length that can be inserted to the bottom of the extra portion, and equipped with a rotary nozzle at the tip of this water pipe, this rotary nozzle,
A rotary unit that has a plurality of discharge ports on its side surface and that discharges high-pressure water supplied through a water pipe to the surroundings from each of these discharge ports, and that is rotated by the discharge reaction force of the high-pressure water, and this rotation unit. And a propulsion unit connected to the tip of the unit to generate a forward thrust as the rotating unit rotates in uncured concrete.