JPH10252U - Pile support layer detection device - Google Patents

Abstract

(57) [Problem] To provide a pile support layer detection device capable of correctly confirming the arrival of a support layer during excavation by hydraulic drive. SOLUTION: A hydraulic pressure detecting means 9 for detecting a hydraulic pressure during excavation of an auger driving hydraulic motor for driving an auger 4 of an excavator for drilling a ground, a flow rate detecting means 10 for detecting a flow rate of oil, and the auger 4, a depth detecting means 12 for detecting a vertical moving distance, a signal converting device 19 for converting a detection signal input from each of the detecting means into a digital signal, and a unit depth based on the signal input from the signal converting device 19. A computing device 18 for integrating hydraulic energy required for excavation of
A display device 22 for displaying the hydraulic energy integrated by the arithmetic device 18 with the depth as the vertical axis.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a pile support layer detection device that can easily confirm the arrival status of a support layer when a pile is built underground.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, in a pile driving work in which a ground is excavated with an excavator such as an earth auger to build a pile, it is necessary to confirm whether or not the tip of the pile has reached a ground support layer.

Conventionally, when excavating the ground using a hydraulically driven auger, as a means for determining whether or not the tip of the auger has reached the support layer, the N value is calculated by integrating the N value with a hydraulic pressure gauge of a hydraulic motor. (Integral) and calculate the estimated N 'value of the bearing layer from the N value obtained in the standard penetration test and the current value of the auger drive motor or the value measured by the oil pressure gauge when the pile is actually installed. A method that estimates the bearing capacity of the support layer based on the equation (JP-A-3-28410) or measures the excavation resistance of the auger by directly connecting a torque meter to the auger, and penetrates the pile There is a method in which the frictional resistance at the time is measured by a pressure gauge, and the thrust acting on the auger is determined therefrom to determine the supporting force of the supporting layer (Microfilm of Japanese Utility Model Application No. 61-151568).

[0004]

[Problems to be solved by the invention]

 However, in the case of the former, the calculation formula shown therein is applicable only when the auger rotation speed is constant because the flow rate of oil is not taken into account, and therefore the auger rotation speed fluctuates. However, there is a problem that the bearing capacity cannot be always determined accurately.

Further, in the case of the latter, since it depends only on the excavation resistance of the auger, it is difficult to accurately determine the bearing force even when affected by fluctuations in the excavation speed and rotation speed, and the components are diversified. Therefore, there is a problem that the device becomes large-scale.

[0006] In view of the above, an object of the present invention is to provide a pile support layer detection device capable of correctly confirming the arrival of a support layer during excavation by hydraulic drive.

[0007]

[Means for Solving the Problems]

 As a means for solving the problems of the prior art, the present invention provides a hydraulic pressure detecting means for detecting a hydraulic pressure during excavation of an auger driving hydraulic motor that drives an auger of an excavator for drilling the ground. A flow rate detecting means for detecting a flow rate of oil, a depth detecting means for detecting a vertical moving distance of the auger, and a signal converter for converting a detection signal input from each of the detecting means into a digital signal. An arithmetic unit that integrates hydraulic energy required for excavation at a unit depth based on a signal input from the signal conversion device, and a display device that displays the hydraulic energy integrated by the arithmetic unit with depth as a vertical axis. It has a feature.

[0008] Therefore, the depth and the N value based on the N value data obtained in advance by the boring survey are input to the arithmetic unit, and the depth of the drilling step by step during the actual excavation at the time of the actual pile driving is determined. The hydraulic pressure data is respectively detected, calculated so as to correspond to the depth and the N value, coordinated, and both are displayed on a display device. The display contents of the two are compared on the same screen to check the bearing capacity of the pile and the state of reaching the support layer.

[0009]

[Embodiment of the invention]

 Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. FIG. 1 shows a screw auger as an example of an excavator used in the present invention. In the excavator, a tower 2 is supported by a traveling bogie 1 by a stay 3 in a vertical direction. A drive unit 5 having a drive hydraulic motor for rotating and driving the screw auger 4 on its side and a speed reducer is suspended by a wire rope 6 so as to move up and down along the tower 2. The wire rope 6 is wound up and down by a winch 8 on the traveling carriage 1 via a top sheave 7 at the upper end of the tower 2.

The traveling vehicle 1 is provided with a hydraulic pressure detecting means 9 having a hydraulic pressure gauge for detecting the hydraulic pressure and flow rate of the hydraulic motor, and a flow rate detecting means 10 having an electromagnetic flow meter. A member that rotates by unwinding the wire rope 6, for example, an intermediate sheave 11, is provided with a depth detecting means 12 such as a rotary encoder or the like, and detects a descending distance of the driving unit 5, that is, a digging depth of the screw auger 4. It is done as follows.

When an encoder is used as the depth detecting means 12, an arm 14 is provided on a shaft 13 of the intermediate sheave 11 as shown in a front view in FIG. The encoder 15 is attached, the wire rope 6 is pressed against the rotor 16 of the encoder 15 by the pressing roller 17, and the movement of the wire rope 6 is transmitted as rotation to the encoder 15, and the excavation depth is calculated from the movement amount of the wire rope 6. Can be configured.

As shown in FIG. 2, the detection signals detected by the oil pressure detecting means 9, the flow rate detecting means 10, and the depth detecting means 12 are digitally communicated with an arithmetic unit 18 (for example, a personal computer). The digital signal converted into a signal is input to the signal conversion device 19, and the digital signal converted here is input to the arithmetic device 18. Reference numeral 20 denotes an operation panel, and 21 denotes a printer.

The arithmetic unit 18 is input with a depth and an N value based on N value data obtained in advance by a boring survey, and receives hydraulic data based on a signal input from the signal conversion device 19 with a screw. Hydraulic energy required to excavate a certain distance (eg, 10 cm increments) of auger 4

(Equation 1) Are integrated, and the peak value of the integrated value is displayed on the screen of the CRT 22 as a display device so that the peak value is connected and displayed. That is, on the screen of the CRT 22, a graph of the depth-N value showing the condition of the support layer by the boring survey and a graph showing the condition of the support layer of the pile at the time of actual pile driving are simultaneously displayed on the same screen.

[0014] In order to mainly improve the soil discharging efficiency during the excavation, after excavating from the state shown in FIG. 6A to the state shown in FIG. May be soiled. Performs measurements for drilling distance L ₁ from the start drilling this time (FIG. 6 (A)) to a predetermined depth, the pulling distance L ₂ shown in FIG. 6 (C) does not perform integration as only stores the value are Purokura arm to perform the integration of the new drilling starting point without the distance L ₂ measured shown in FIG. 6 (C) when starting the drilling again.

Therefore, the depth and N value based on the N value data obtained by the boring survey are input to the arithmetic unit 18 in advance. The flow rate is detected by each of the detecting means 9 and 10, and the depth is detected by the depth detecting means 12 from the movement of the wire rope 6. These signals are inputted to a signal converter 19 and converted into digital signals.

The converted digital signal is input to the arithmetic unit 18 and is calculated so as to correspond to the depth and the N value based on the boring survey described above, and as shown in FIG. Data A and data B by actual measurement are displayed at the same time. By comparing and observing both data A and B, the situation until the pile reaches the support layer can be confirmed.

[0017]

[Effect of the invention]

 As described above, according to the present invention, it is possible to display the hydraulic data (hydraulic energy) during actual excavation on the display device to check the state of the support layer on the ground, making it easy and easy to determine the support layer. Can be done accurately. Also, since the number of components is small, the apparatus can be made compact.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of an excavator used in the present invention.

FIG. 2 is a system diagram showing an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing display contents displayed on the display device (CRT) in FIG. 2;

FIG. 4 is a front view showing an embodiment of a depth detecting unit.

FIG. 5 is a plan view of the same.

FIGS. 6A to 6D are explanatory diagrams of a case where an auger is pulled up during excavation.

[Explanation of symbols]

 Reference Signs List 4 screw auger 5 drive unit 6 wire rope 9 oil pressure detection means 10 flow rate detection means 12 depth detection means 18 arithmetic unit 19 signal conversion unit 22 display device (CRT)

Claims (1)

[Utility model registration claims] A hydraulic pressure motor for driving an auger for driving an auger of an excavator for boring a ground; a hydraulic pressure detecting means for detecting a hydraulic pressure during excavation; a flow rate detecting means for detecting a flow rate of oil; Depth detection means for detecting the direction movement distance, a signal conversion device for converting a detection signal input from each of the detection means into a digital signal, and a hydraulic pressure required for excavation of a unit depth based on the signal input from the signal conversion device A pile support layer detecting device, comprising: an arithmetic device for integrating energy; and a display device for displaying the hydraulic energy integrated by the arithmetic device on a vertical axis with depth.