JPH0517943A - Method for measuring supporting force of vibration driven pile - Google Patents

Abstract

PURPOSE:To contrive elimination or reduction of labor and safety at the time of detecting supporting force by automatically detecting the supporting force of a pile driven by a vibro pile driver. CONSTITUTION:A motor output is calculated by a computer 8 from voltage and current value signals of a current applied to a drive motor 1a of a vibro pile driver 1. Simultaneously, a signal of representing a sinking amount for a fixed time of a pile 2 by a television camera 10 is input to the computer 8 in which supporting force of the pile 2 is calculated from a motor output value and the sinking amount of the pile.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration striking system capable of automatically measuring a supporting force of a pile to be driven by a vibrating pile driving machine when constructing a erection gantry, a pier for erection or at the time of mountain retaining work. The present invention relates to a method for measuring bearing capacity of piles.

[0002]

2. Description of the Related Art Conventionally, in the construction of erection gantry and mountain retaining work,
H-shaped steel is piled as a pile by a vibrating pile driver. At that time, the pile length is often determined from boring data, and the bearing capacity of each pile is not actually measured. Absent. However, if the piled piles have insufficient bearing capacity, the piles will collapse and fall, so in order to prevent this, recently, the bearing capacity of the piles has been detected. In that case, a person measures the current value and voltage value of the current applied to the drive motor of the vibrating pile driver to detect the motor output, and at the same time, the person detects the sinking amount of the pile for a certain period of time to settle the sinking speed. Is calculated, and a person calculates the bearing capacity of the pile from the correlation between the detected values.

[0003]

Conventionally, when measuring the supporting force of a driving pile, the current value of the current applied to the drive motor of the vibration pile driving machine is measured with an ammeter and the voltage value is measured with a voltmeter. Had to do. In addition, the sinking speed of the piles is detected separately, and in order to measure the bearing capacity of the piles, a total of three people are required in addition to the above-mentioned two persons who detect the current and voltage. It was dangerous for the detectives. Therefore, an object of the present invention is to make it possible to automatically detect the supporting force of a pile to be driven, thereby saving labor and detecting safety when detecting the supporting force.

[0004]

In order to achieve the above object, the present invention inputs a voltage value signal and a current value signal of a current applied to a drive motor of a vibrating pile driver into a converter, and inputs the input data into a computer. And the motor output is calculated. Also, the sinking amount of piles that are laid simultaneously is measured with a TV camera and input to a computer
The computer calculates the supporting force of the pile from the motor output and the sinking amount data of the pile and displays it on the display device.

[0005]

In the above method of measuring the bearing capacity of the vibrating pile driving machine, the current value and the voltage value of the current applied to the drive motor of the vibrating pile driving machine are automatically input to the computer without human detection. Then, the computer calculates the output of the drive motor. Further, the sinking amount of the pile for a certain period of time is automatically input to the computer from the television camera, and the computer can calculate and display the supporting force of the pile from the data of the motor output and the sinking amount. Therefore, at the time of detecting the supporting force of the driving pile, only one person needs to judge the measurement result of the supporting force of the pile of the display device, which is labor-saving and can be measured safely.

[0006]

Embodiments of the present invention will be described with reference to FIGS.
The vibrating pile driver 1 drives the driving motor 1a to drive the pile 2 while vibrating the pile 2. Drive motor 1
The current a is supplied from the generator 3 via the voltmeter 4, the ammeter 5, and the switch 6.
The ammeter 5 automatically inputs the voltage value signal and the current value signal to the converter 7, respectively.

The converter 7 is equipped with a computer 8 so that the motor output can be calculated from the input voltage value signal and current value signal. That is, the motor output Ν is the voltage Ε during motor operation, the current Ι during motor operation,
When the motor efficiency η and the motor power factor / φ are given, the following equation is obtained. Ν = Ε x Ι x 3 x η x / φ x (1/1000) Based on this calculation formula, the motor output is calculated from the voltage value and the current value in consideration of the motor efficiency and the motor power factor. Is taken in by the computer 8. For example, when the voltage value is 210 V and the current value is 230 A, the computer 8 calculates the motor output 58.5 kgm.
Note that the above equation for obtaining the motor output N is different from the above if the soil quality changes.

In order to measure the sinking amount for a certain time when the pile 2 is driven, a scale plate 9 is attached to the pile 2 and a laser beam is emitted from the laser beam transmitter 10a so that the television camera 10 can emit the laser beam for a certain time. The displacement of the laser beam on the scale plate 9 of Fig. 3 is measured as shown in Fig. 3, and the image signal of Fig. 3 is automatically input to the converter 7, where the sinking amount of the pile 2 for a certain period of time is detected. ing. Based on this input signal, the computer 8 provided in the converter 7 calculates the supporting force of the pile 2 to be driven from the relationship between the motor output and the sinking amount and displays it on the display device 11. There is. That is, the supporting force R _A is R _A = N / (0.04V + 0..V) between the motor output Ν and the sinking amount V of the pile for a certain time.
9) There is a relation of Ton, and the computer 8 is adapted to calculate the supporting force from this formula.

[0009] Between the fixed subsidence of the pile 2 time corresponds to sink rate, supporting force R _A and the motor output (work rate) sink rate of Ν and pile Va and speed loss coefficient Vc, R _A = Ν /
There is a relationship of (Va + Vc). And computer 8
May detect the subsidence speed from the image signal of the television camera 10 and calculate the bearing capacity of the pile from the equation for obtaining R _A. When measuring the supporting force of a pile piled by vibration, each measuring device is arranged as shown in FIG. 1, and the voltage signal and the current signal of the current supplied to the drive motor 1a of the vibration pile driver 1 are automatically measured. Input to the converter 7 to calculate the motor output. At the same time, the television camera automatically inputs the image signal of the settlement amount of the pile for a certain period of time to the computer 8 and calculates the settlement amount of the pile for the certain period of time. Computer 8
Furthermore, the supporting force of the pile is calculated from the motor output and the sinking amount of the pile, and is automatically displayed on the display device 11.

[0010]

According to the present invention, a person can detect the supporting force of a pile driven by a vibrating pile driver by detecting the voltage and current of the drive motor of the pile driver, or the sinking amount of the pile by a television camera. Can be automatically measured without measuring, and labor can be saved and the measurement can be performed safely.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method for measuring a bearing capacity of a pile according to the present invention.

FIG. 2 is a calculation table for obtaining a motor output of a drive motor of a vibrating pile driver from a voltage value and a current value.

FIG. 3 is an explanatory diagram in a case of obtaining a settlement amount of a pile for a certain period of time.

[Explanation of symbols]

 1 Vibration Pile Driver 2 Pile 4 Voltmeter 5 Ammeter 8 Computer 10 TV Camera 11 Display Device

Claims (1)

Claims: 1. A voltage value signal and a current value signal of a current applied to a drive motor of a pile driving machine when a pile is driven by a vibrating pile driving machine are input to a converter and input. The detection data is processed by the computer which the converter has to calculate the drive motor output, and at the same time, the television camera inputs a signal for obtaining the settlement amount of the pile for a certain time, and the computer displays the pile settlement amount. A supporting force measuring method for a vibrating pile, wherein a supporting force of the pile is calculated from the calculated value and the motor output value and displayed on a display device.