JPH06228958A - Inclination preventive control method for pile jacking and pulling-out machine - Google Patents

Abstract

PURPOSE:To prevent a pile jacking machine from being inclined by installing a repulsion cylinder to a mast and detecting the pressure and the flow rate of a jacking cylinder and operating the repulsion cylinder so as to make up an insufficient reaction in case when the detected value exceeds a reaction value preliminarily input into an arithmetic operation device. CONSTITUTION:A repulsion cylinder 12 is installed to a mast 4 of a pile jacking and pulling out machine which are continuously installed to sheet piles P. The pressure and flow rate of a pulse fluid pressure cylinder 11 are detected and the detected value is input into an arithmetic operation device while the detected value is compared with a preliminarily input reaction value. In case when the detected value exceeds a setting value, the repulsion cylinder 12 is operated, thereby making for the shortage of reaction force and preventing the pile jacking and pulling out machine from being inclined. This construction makes is possible to jack in the piles vertically no matter how hard the ground may be.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing tilt of a pile press-in / pull-out machine, which prevents the pile press-in / pull-out machine from tilting due to insufficient reaction force when press-fitting a pile such as a steel sheet pile into the ground.

[0002]

2. Description of the Related Art When a large number of piles such as steel sheet piles are continuously press-fitted into the ground, a pile press-fitting / extracting machine that moves by itself on existing piles is used. This pile press-in / pull-out machine is mounted and fixed on the existing pile row by grasping the upper ends of the existing piles by a clamp hanging on a saddle. Therefore, at the time of press-fitting the pile, the pulling resistance of the existing pile held by the clamp and the reaction force necessary for the press-fitting of the pile are secured by the weight of the pile press-fitting and drawing machine.

[0003]

However, when the pile press-fitting point is hard ground during construction of the pile row, the tip resistance, peripheral surface resistance and section resistance of the press-fit pile are large, and press-fitting of the pile is not easy. Therefore, the pile pressure input is increased to press the pile. If the pressing force is increased in this way, the reaction force will be insufficient and the pile gripped by the clamp will come out of the ground, and the pile press-in / pull-out machine will tilt, making it difficult to press-in the pile vertically and to a predetermined depth. It becomes difficult to press fit.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for preventing tilt of a pile press-fitting / pulling machine, which prevents tilting of the pile press-fitting / pulling machine and allows the pile to be press-fitted accurately and smoothly.

[0005]

In order to achieve the above object, a tilt prevention control method for a pile press-fitting / extracting machine according to the present invention detects a fluid pressure and a fluid flow rate of a pulse fluid pressure cylinder and calculates a detection value thereof. It is characterized in that the repulsion cylinder is actuated when input to the device, the reaction force value set in advance in the arithmetic device is compared with the detection value, and when it is judged to be equal to or more than the set reaction force value.

[0006]

[Operation] When a pile press-fitting site presses a pile by reciprocating the pulse fluid pressure cylinder at high speed on a hard ground, the fluid pressure and fluid flow rate of this pulse fluid pressure cylinder are detected, and the detected values are set by an arithmetic unit. If the detected value is equal to or higher than the set reaction force value, the repulsion cylinder is activated to apply a pressing force to the pile press-in / extractor and the pile press-in / extractor is not tilted to lift the pile. It can be pressed in smoothly.

[0007]

Embodiments of the present invention will be described with reference to FIGS. A slide base 3 is slidably mounted on a saddle 2 on which a clamp 1 for holding an existing pile P row is suspended.
A mast 4 is erected on the upper part of the slide base 3, and a slide rail 6 on which a lifting body 5 moves up and down is provided at the front of the mast 4.
Is installed. A chuck body 7 is integrally formed at the tip of the lifting body 5, and a main fluid pressure cylinder 8 for vertically driving the chuck body 7 is vertically mounted between the front portion of the slide base 3 and the lifting body 5. .

Inside the chuck body 7, a chuck 10 which moves up and down in the chuck body 7 by being guided by a slide rail / rotation preventing ridge 9 formed on the inner peripheral surface of the chuck rotating portion 14 is provided. Has been done. A pulse fluid pressure cylinder 11 is attached between the chuck body 7 and the chuck 10 via the chuck rotating unit 14. With this configuration, the chuck 10 can be moved up and down separately by the main fluid pressure cylinder 8 and the pulse fluid pressure cylinder 11, and can be moved up and down simultaneously by both fluid pressure cylinders 8 and 11. The chuck rotating unit 14 can rotate the inside of the chuck body 7 by transmitting a rotating force to the gear 15 by a rotating mechanism (not shown). With this rotation, the chuck 10 rotates at the same time because it is engaged by the slide rail / rotation stop ridge 9. A repulsion cylinder 12 is provided between the rear portion of the mast 4 and the slide base 3. The repulsion cylinder 12 prevents the pile pulling machine from tilting when the pile is press-fitted.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS.
It will be described based on. The ground is hard at the place where the pile is pressed in,
When the pile cannot be press-fitted by the operation of the main fluid pressure cylinder 8, the pulse fluid pressure cylinder 11 is reciprocated at high speed to press-fit. Since the pulse fluid pressure cylinder 11 reciprocates at high speed, the hard ground is crushed by the tip end of the pile and press-fitting is performed while reducing the tip resistance of the pile, so that smooth press-fitting is possible.

At this time, the fluid pressure sensor and the flow rate sensor attached to the pulse fluid pressure cylinder 11 detect the fluid pressure and the fluid flow rate, and the detected values are input to the arithmetic unit 13. The arithmetic unit 13 compares the input detection value with a pre-stored set reaction force value, and when it is determined that the set reaction force value is greater than or equal to the set reaction force value, the repulsion cylinder 12 is operated.

The repulsion cylinder 12 applies downward pressure to the saddle 2 of the pile press-in / pull-out machine. Repulsion cylinder 1
When it is detected that the pulse fluid pressure cylinder 11 is in the ascending operation during the operation of 2, the operation of the repulsion cylinder 12 is stopped by the stop signal from the arithmetic unit 13. In this way, the repulsion cylinder 12 operates only during the downward movement of the pulse fluid pressure cylinder 11, maintains the balance with the pile pressure input, and the press-fitting / extracting machine does not tilt even if a pressure input greater than the reaction force acts, and the pile press-fitting machine does not press. Can be performed vertically and smoothly.

[0012]

According to the control method of the present invention, when the pile pressure input value is detected and when the value exceeds the set reaction force value, the repulsion cylinder is immediately actuated to reduce the pressing force to the pile press-in / pull-out. Since the pile press-fitting / extracting machine does not tilt even when the reaction force is insufficient, the pile can be vertically and smoothly press-fitted even on hard ground, even if the reaction force is insufficient.

[Brief description of drawings]

FIG. 1 is a side view of a pile press-fitting / pulling machine for controlling the present invention.

FIG. 2 is a vertical sectional side view taken along line AA of FIG.

3 is a cross-sectional plan view taken along line BB of FIG.

FIG. 4 is a plan view of a pile press-fitting / pulling machine for controlling the present invention.

FIG. 5: Flow chart of the operation of the present invention

FIG. 6 is a block diagram of a control system of the present invention.

[Explanation of symbols]

 1 Clamp 2 Saddle 3 Slide Base 4 Mast 5 Lifting Body 6 Sliding Rail 7 Chuck Body 8 Main Fluid Pressure Cylinder 9 Sliding Rail and Rotation Stop Protrusive 10 Chuck 11 Pulse Fluid Pressure Cylinder 12 Repulsion Cylinder 13 Computing Unit 14 Chuck Rotating Part 15 gears

Claims (1)

[Claims] 1. A fluid pressure and a fluid flow rate of a pulse fluid pressure cylinder are detected, the detected values are input to an arithmetic unit, and a reaction force value set in advance in the arithmetic unit is compared with the detected value to detect the value. When the value is determined to be greater than or equal to the set reaction force value, a tilt prevention control method for the pile press-in / extractor that activates the repulsion cylinder.