JP2678576B2 - Pile press-in / pull-out machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile press-fitting / pulling machine control device for press-fitting and pulling-out a pile, and more particularly to a device for controlling the operation at the time of press-fitting / pulling-out a pile.

[0002]

2. Description of the Related Art A pile press-in / pull-out machine presses and pulls a pile into and out of the ground by vertically moving a chuck while sandwiching the pile. The vertical movement of the chuck is performed by operating a cylinder provided in the pile press-fitting / pulling machine.

FIG. 4 shows a hydraulic circuit for operating this cylinder. The a terminal and the b terminal are connected to the cylinder 1, the pressure oil is supplied from the a terminal, the pile is press-fitted, and the pressure oil is supplied from the b terminal.
The pile is pulled out. The detection unit 2 is inserted between these terminals, and the pressure sensor 3 detects the pressure of the pressure oil of the detection unit 2. Then, the pressure oil to the cylinder 1 is adjusted based on the information detected by the pressure sensor 3 to control the thrust force and speed at the time of press fitting and pulling out of the pile.

[0004]

A control device for a pile press-in / pull-out machine according to the present invention is designed to generate a reaction force by fixing it to an existing pile.
A chuck that holds the ramp and the pile to be pressed and pulled out.
And a cylinder for jacking this chuck.
The existing piles are used as a reaction force to statically press in and pull out the piles.
In that pile press-drawing machine, a pressure sensor for detecting the pressure at the time of driving of the cylinder, a detecting means for detecting the vibration and frequency generated during press-fitting and withdrawal of the pile, and the change information when the output variation of the pressure sensor And a control means for controlling the cylinder by a control signal determined based on the information of the detection means.

[0005]

A control device for a pile press-in / pull-out machine according to the present invention detects a cylinder for vertically moving a chuck for sandwiching the pile for press-fitting and withdrawing the pile, and a pressure when the cylinder is driven. A pressure sensor, a detection means for detecting vibration and frequency generated at the time of press fitting and pulling out of the pile, and a control means for controlling the cylinder based on information of the pressure sensor and the detection means, To do.

[0006]

In the above construction, the pressure sensor detects the resistance change at the time of press fitting and pulling out of the pile, and the detecting means detects the vibration and the frequency. Since the control means determines the type of resistance and the type of soil based on these information and controls the cylinder, efficient press-fitting and pulling-out can be performed.

[0007]

FIG. 1 is a pile press-fitting / pulling machine 10 to which the present invention is applied.
Is shown. The pile press-out machine 10 includes a plurality of clamps 11 for sandwiching a plurality of existing piles P, and a chuck 12 for press-fitting a new pile P0 or pulling out a new pile P0. The plurality of clamps 11 hang down from the saddle 13, and by sandwiching the existing piles P, a reaction force is generated when the piles of the chuck 12 are press-fitted or withdrawn.

At least one of the existing piles P is mounted on the saddle 13.
A slide base 14 that relatively moves in the pile row direction with a stroke of a pitch or more is attached, and a mast 15 is erected on the slide base 14. A guide rail 16 is provided in the vertical direction on the front side of the mast 15, and an elevating body 17 moves up and down along the guide rail. The chuck 12 for press-fitting or withdrawing the pile P0 is attached to the lifting body 17 and moves up and down. The lifting / lowering of the lifting / lowering body 17 is performed by driving the cylinder (main cylinder) 1. As shown in FIG. 4, the cylinder 1 has a pressure sensor 3 arranged in a hydraulic circuit for driving the cylinder 1 to detect pressure oil supplied to the cylinder 1.

In addition to the above construction, the pile press-in / pull-out machine 10 is provided with a detecting means 20 for detecting vibration and frequency at the time of press-fitting / pulling out P0 and a control means 30 for controlling the cylinder 1. FIG. 2 shows the configuration of the detection means 20 and the control means 30.

In this embodiment, the detection means 20 is composed of a vibrometer 21 and a sound collector 22. As shown in FIG. 1, the vibrometer 21 is attached to the chuck 12 that vertically moves by sandwiching the pile P0. The vibrometer 21 indicates the magnitude of vibration generated in the chuck 12 when the pile P0 is press-fitted or withdrawn and the frequency of this vibration. To detect. The sound collector 22 is attached to the front of the saddle 13. The sound collector 22 has a pile P
It is placed so that it faces 0. The sound collector 22 detects the loudness of the sound generated from the pile P0 and its frequency when the pile is pressed in or pulled out.

As shown in FIG. 2, the control means 30 comprises a processing section 31, a flow rate control section 32, and a direction control section 33.
The processing unit 31 includes the vibrometer 21 and the sound collector 22 of the detection means 30.
And the detection data of the pressure sensor 3 of the cylinder 1 are input, and based on these, the resistance and soil type at the time of press-fitting or pulling out the pile are determined. Flow rate control unit 3
Reference numeral 2 controls the amount of pressure oil supplied to the cylinder 1 that moves the chuck 12 up and down, and the direction control unit 33 switches terminals a and b (see FIG. 4) in the hydraulic circuit of the cylinder 1.
The flow rate control unit 32 and the direction control unit 33 are the processing unit 3
The above-mentioned control is performed by the signal output by 1.

Next, this embodiment will be described based on the press-fitting operation of the pile P0. As shown in FIG. 1, with the clamp 11 holding the existing pile P, the cylinder 1 is driven and the chuck 12 is moved.
The pile P0 is press-fitted by. When press-fitting the pile P0, the vibrometer 21 detects the magnitude of the vibration generated in the chuck 12 and its frequency, and the sound collector 22 detects the magnitude of the sound generated by the pile P0 and its frequency.
Then, this detected detection data is output to the processing unit 31. The processing unit 31 uses these detection data and the pressure sensor 3
The press-fitted state of the pile P0 is determined based on the detection data output from.

FIG. 3 shows an example of the judgment in the processing section 31, in which the frequency of vibration is plotted on the horizontal axis and the magnitude of vibration is plotted on the vertical axis. The area A shows the case where the soil is cobblestone, the area B shows the case where the soil is sand, and the area C shows the case where the clay is clay, and these area information is stored in the processing unit 31 in advance.
The processing unit 31 determines the soil quality of the pile at the time of press fitting based on the detection data input from the vibrometer 21 and the sound collector 22. At the same time, the pressure when the pile P0 is press-fitted is detected from the detection data from the pressure sensor 3. Then, the processing unit 31 determines whether the press-fitting control at the time of press-fitting the pile is suitable for the soil quality, and outputs a control signal to the flow rate control unit 32 and the direction control unit 33. As a result, the piles can be pressed in according to the soil quality.

If the press-fitting resistance changes during the press-fitting of the pile P0, the sensor 3 detects this change and outputs it to the processing unit 31. As a result, the processing unit 31 takes in the detection data of the vibrometer 21 and the sound collector 22, and based on these detection data and the pressure change data from the pressure sensor 3, the change is the section resistance of the pile or the tip of the pile. Judging whether it is due to resistance or sliding surface resistance. In this case, the value obtained by subtracting the pull-out load from the press-fit load is judged as the tip resistance load of the pile. Further, a value obtained by subtracting the tip resistance load from the press-fit load is determined as the sliding surface resistance load. Further, since the sliding surface resistance is a smaller value than the tip resistance or the section resistance, when the quotient obtained by dividing the press-fit load by the pull-out load becomes smaller than a predetermined set value, it is determined that the resistance is the section resistance load. After this determination, the control signal is output to the flow rate control unit 32 and the direction control unit 33 to perform press-fitting control of the pile according to the type of resistance.

Therefore, by the above operation, the press-fitting control of the pile can be performed according to the soil quality and the press-fitting control according to the resistance can be performed, and the press-fitting of the pile can be performed efficiently. When the pile press-fitting / pulling machine 10 is operating, the pile press-fitting / pulling machine 10 is operated.
Although it vibrates itself, the frequency and magnitude of this vibration are different from the operation at the time of press-fitting the piles, and therefore can be easily removed by determining by the processing unit 31. The noise from the surroundings is also the same and can be determined by the processing unit 31. The above operation has been described when the pile is press-fitted, but also in the pulling-out of the pile, the same efficient pulling-out can be performed by performing the above-described control.

The present invention is not limited to the above-mentioned embodiment, and for example, the detecting means 20 may be any one as long as it detects the magnitude and frequency of vibration at the time of press fitting or pulling out of the pile, and other detectors may be used. Alternatively, one of the vibrometer and the sound collector may be used. Further, the mounting parts of these detecting means can be arbitrarily changed.

[0017]

The present invention according to the present invention detects the size and frequency of the vibration at the time of press-fitting or withdrawal of pile, the information for processing in response to changes in the pressure sensor information, soil type, and the pile It is possible to cope with changes in the type of mortar piles that operate, and thus it is possible to efficiently press fit or pull out piles while suppressing the control load .

[Brief description of the drawings]

FIG. 1 is an overall side view of an embodiment of the present invention.

FIG. 2 is a block diagram of detection means and control means.

FIG. 3 is a characteristic diagram showing an example of judgment.

[Fig. 4] Hydraulic circuit of cylinder

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 cylinder 3 pressure sensor 10 pile press-fitting / pulling machine 12 chuck 20 detection means 30 control means

Claims (1)

(57) [Claims] [Claim 1] For generating a reaction force by fixing to an existing pile
Chuck that clamps the clamp and the pile to be press-fitted and withdrawn
And a cylinder for jacking this chuck.
The existing piles are used as a reaction force to statically press in and pull out the piles.
In that pile press-drawing machine, a pressure sensor for detecting the pressure at the time of driving of the cylinder, a detecting means for detecting the vibration and frequency generated during press-fitting and withdrawal of the pile, and the change information when the output variation of the pressure sensor A control device for controlling the cylinder according to a control signal determined based on the information of the detection device, the control device for the pile press-fitting / extracting machine.