JP2735734B2 - Pile support layer detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a pile support layer, which makes it possible to easily confirm the state of the pile reaching the support layer when the pile is built underground.

[0002]

2. Description of the Related Art Conventionally, in a pile driving operation for excavating the ground using an excavator such as an earth auger, it is necessary to confirm whether or not the tip of the pile has reached a support layer of the ground.

[0003] As for confirmation of the above-mentioned support layer, for example, as described in Japanese Patent Publication No. 56-17511, the integrated current value obtained by excavation and the N
This is done by comparing values.

[0004]

However, in the above-mentioned conventional work for confirming the support layer, the recording paper of the integrated current value to be output must be compared with the soil column diagram of the separate sheet, and the judgment of the support layer is made. There is a problem that the operation becomes extremely complicated.

In view of this, the present invention displays the N-value curve of the soil column diagram and the hard / soft data (integrated current value) of the ground based on the data detected during excavation on the same screen based on the depth. The object of the present invention is to provide a pile support layer detecting method which facilitates comparison and determination work.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art. Current data detecting means for detecting a value, depth detecting means for detecting a vertical moving distance of the auger, a signal converting device for converting a detection signal from each of the detecting means into a digital signal for input to a personal computer, Using a personal computer having a CRT for inputting current data and N-value data obtained by pre-boring survey based on a signal input from the apparatus and displaying the N-value on the same screen, the N-value is displayed on the CRT, The auger current data and the excavation depth are simultaneously measured by the current data detection means and the depth detection means at the same time as the excavation by It is converted into a digital signal by the device, input to a personal computer, and displayed on the same screen along with the N value data on the CRT. Sometimes, the integration of the current data is restarted from the extraction start point.

[0007]

[Function] A depth and an N value based on N value data obtained by a boring survey are input to a personal computer in advance,
The current data at the stepwise excavation depth at the time of excavation at the time of actual pile driving is respectively detected and calculated by a personal computer so as to correspond to the depth and N value based on the boring survey,
The coordinates are converted and both are displayed on a CRT of a personal computer on a screen. The display contents of the two are compared in the same screen to confirm the support force status of the pile and the support layer arrival status. When the auger is pulled in the middle, the current data from the pulling start point is integrated when the excavation is resumed without adding the current data for the pulling distance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below 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 this excavator, a tower 2 is supported on a traveling vehicle 1 by a stay 3 in a vertical direction. A drive unit 5 having a drive motor for driving the screw auger 4 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 of the traveling vehicle 1 via a top sheave 7 at the upper end of the tower 2.

The traveling vehicle 1 is provided with a current data detector 9 for detecting current data of a driving motor, and a member rotating by unwinding the wire rope 6, for example, an intermediate sheave 10 is provided with a depth by a rotary encoder or the like. A detector 11 is provided to detect the descending distance of the drive unit 5, that is, the excavation depth of the screw auger 4.
Here, the current data refers to data obtained by converting a current value such as a current value or a power value.

When an encoder is used as the depth detector 11, an arm 13 is provided on a shaft 12 of the intermediate sheave 10 as shown in a front view in FIG. The wire rope 6 is pressed against the rotor 15 of the encoder 14 by the pressing roller 16 to transmit the movement of the wire rope 6 to the encoder 14 as rotation, and the excavation depth is calculated from the movement amount of the wire rope 6. Be composed.

A signal converter for converting the detection signals detected by the current data detector 9 and the depth detector 11 into digital signals so as to communicate with a personal computer 17 (hereinafter referred to as a personal computer) as shown in FIG. 1
8, and the converted digital signal is input to the personal computer 17.

A depth and an N value based on N value data obtained by a boring survey are input to the personal computer 17 in advance, and current data of the screw auger 4 is obtained based on a signal input from the signal converter 18. The calculation is performed for each fixed distance (for example, every 10 cm), each integrated value is integrated for each depth, and the peak value of the integrated value is connected to the peak value and displayed. The graph of the depth-N value showing the situation and the graph showing the situation of the support layer of the pile at the time of the actual pile driving are simultaneously displayed on the same screen.

In order to mainly improve the discharging efficiency during the excavation, excavation is performed from the state shown in FIG. 6 (A) to the state shown in FIG. 6 (B), and then the screw auger 4 is slightly lifted and discharged as shown in FIG. 6 (C). There is. In this case, excavation starts (Fig. 6
Performs measurements for drilling distance L ₁ from (A)) to a predetermined depth, and stores the value for pulling distance L ₂ in FIG. 6 (C), the integration of the current data is not performed, it starts drilling again when the distance L ₂ shown in FIG. 6 (C) is programmed to perform the integration of the current data from the new excavation starting points without measuring.

In FIG. 1, reference numeral 20 denotes an operation panel, and reference numeral 21 denotes a printer. , Measurement switch 27,
A switch 28, a pile number setting switch 29, a wire number setting switch 30, a start depth setting switch 31, and the like are provided.

Therefore, the depth and the N value are input to the personal computer 17 based on the N value data obtained by the boring survey in advance, and the current data at the stepwise excavation depth during the actual excavation at the time of pile driving is detected as the current data. The movement of the wire rope 6 is detected by the depth detector 11 while the movement of the wire rope 6 is detected by the detector 9, and these signals are input to the signal conversion device 18 and converted into digital signals. The converted digital signal is input to the personal computer 17 and calculated by the personal computer 17 so as to correspond to the depth and the N value based on the above-mentioned boring survey, and as shown in FIG. Data B by actual measurement
And are displayed at the same time. By comparing and observing the two data A and B, the situation until the pile reaches the support layer can be confirmed.

[0017]

As described above, according to the present invention, the state of the ground support layer can be confirmed by simultaneously displaying the ground N value and the current data obtained by actual excavation on the CRT of the personal computer. The work of determining the support layer can be performed easily and accurately.

[Brief description of the drawings]

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

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

FIG. 3 is an explanatory diagram showing display contents displayed on the 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.

FIG. 7 is a front view of the operation panel.

[Explanation of symbols]

 4 Screw Auger 5 Drive Unit 6 Wire Rope 9 Current Data Detector 11 Depth Detector 14 Encoder as Depth Detector 17 Personal Computer 18 Signal Converter 19 CRT

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-280031 (JP, A) JP-A-63-67319 (JP, A) JP-A-51-84109 (JP, A) 28410 (JP, A) JP-A-57-146816 (JP, A) JP-A-50-111818 (JP, A) JP-A-56-17511 (JP, B2) JP-B-49-2524 (JP, B1)

Claims (1)

(57) [Claims] 1. An auger driving motor for driving an auger of an excavator for boring a ground, current data detecting means for detecting a current value during excavation, and depth detecting means for detecting a vertical moving distance of the auger. A signal converter for converting a detection signal from each of the detection means into a digital signal for inputting to a personal computer; and inputting current and N-value data obtained by performing a boring survey in advance based on the signal input from the signal converter. Using a personal computer having a CRT for display on a screen, the N value is displayed on the CRT, and the auger current data and the excavation depth are measured by the current data detection means and the depth detection means simultaneously with the start of excavation by the excavator. Is started, and this detection signal is converted into a digital signal by the signal converter, input to a personal computer, and displayed on a CRT together with the N value data on the same screen. A method of detecting a pile support layer, wherein, when an auger is extracted during excavation, the integration of current data from the extraction start point is interrupted, and the integration of current data is restarted from the extraction start point when excavation is resumed. .