JP6911356B2 - Support layer arrival judgment method and judgment support system - Google Patents

Description

The present invention relates to a support layer arrival determination method and a determination support system for determining the arrival of a support layer in a pile hole in which a pile is installed.

When constructing a structure, a plurality of piles may be driven into a support layer to support the load of the structure in the support layer through the piles. Therefore, the pile hole into which the pile is inserted must reach the support layer. However, due to the restrictions of the excavation method, confirmation of arrival at the support layer often depends on subjective judgment based on experience, and objective judgment is difficult.

Usually, before constructing a structure, a ground survey is conducted to identify the depth (position) of the support layer. Then, the N value of the index indicating the hardness of the ground is acquired by the standard penetration test in the ground survey.

However, the geological structure is not always the same at the entire site where the structure is constructed. In addition, it is difficult to conduct a ground survey at all pile hole positions because the ground survey requires cost and labor. Further, even if the acquired N values are the same, the geology may be different. Therefore, it was difficult to determine that the pile holes of each pile reached the support layer even if the columnar chart and N value based on the ground survey were grasped.

Therefore, conventionally, the resistance value (current value for outputting the drilling torque) according to the hardness of the ground at the time of excavation is integrated for each drilling depth to reach the support layer of the pile hole. A technique for determining is being studied (see, for example, Patent Document 1). In Patent Document 1, the current value at the time of excavation of the auger drive motor that drives the auger of the excavator that drills the ground is detected, and the vertical movement distance of the auger is detected. Then, at the same time as the start of excavation by the excavator, the current data of the auger and the measurement of the excavation depth are started, and these and the N value obtained by the boring survey in advance are displayed on the same screen.

Japanese Unexamined Patent Publication No. 5-287721

Even in Patent Document 1 described above, it is difficult to determine the arrival of the support layer depending on the geological structure. For example, a fine sand layer with a high N value may be laminated on a mudstone with a high N value. In such formations, mudstone is used as a support layer. However, even in the fine sand layer above it, the N value and the stacking current value are detected high, and there is a possibility that the drilling to the support layer is erroneously determined.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a support layer arrival determination method and a determination support system for determining the arrival of a hole in a support layer.

-The support layer arrival determination method for solving the above problems is a support layer arrival determination method for determining the arrival of a pile at a pile hole in a pile hole, and is a speed index for an excavation speed at the time of excavation of the pile hole. A value, that is, the excavation water supplied to the excavation head of the excavator that excavates the pile hole at the time of the excavation.
Acquires a velocity index value including the amount of water corresponding to the depth of the pile hole, associates the velocity index value with the depth of the pile hole at the time of excavation, and responds to a change in the amount of water of the speed index value. To determine the arrival at the support layer. As a result, even when geology with a high N value or integrated current value is laminated, the velocity index value changes depending on the geology. Therefore, based on this change in the velocity index value, the drilling support layer is subjected to. The arrival can be determined.

-In the support layer arrival determination method, it is preferable to use at least one of the statistical value of the excavation speed, the time required for excavation at a unit depth, and the amount of water used at the time of excavation as the velocity index value. This makes it possible to determine the arrival of the drilled hole in the support layer based on the statistical value of the drilling speed, the time required for drilling at a unit depth, and the change in the amount of water used during drilling.

-In the support layer arrival determination method, it is preferable to further use the current value acquired at the time of excavation of the pile hole to determine the arrival at the support layer. As a result, it is possible to accurately determine the arrival of the drilled hole in the support layer with reference to the current value.

-In the support layer arrival determination method, the arrival at the support layer is achieved by comparing the reference value for the velocity index value corresponding to the geology from the ground surface to at least the support layer with the velocity index value at the time of excavation. It is preferable to determine. As a result, it is possible to accurately determine the arrival of the drilled hole in the support layer with reference to the reference value for the velocity index value corresponding to the geology from the ground surface to the support layer.

-The judgment support system for solving the above problems is a judgment support system for supporting the judgment of reaching the support layer of the pile for the pile hole, and is a speed index for the excavation speed at the time of excavation of the pile hole. A measuring unit that measures a speed index value including an amount of excavated water supplied to the excavation head of an excavator that excavates the pile hole at the time of the excavation according to the depth of the pile hole, and the above. A recording unit that records the speed index value in the measurement information storage unit in association with the depth of the pile hole at the time of excavation, and an output unit that outputs the change in the water amount of the speed index value recorded in the measurement information storage unit. And. As a result, it is possible to accurately determine the arrival of the drilled hole in the support layer based on the change in the velocity index value that changes according to the geological change.

According to the present invention, it is possible to accurately determine the arrival of the drilled hole in the support layer.

It is explanatory drawing of the excavation apparatus which excavates a pile hole in an embodiment, (a) is the schematic front view of the excavation apparatus, (b) is the block diagram which shows the structure of the drilling management system. It is explanatory drawing explaining the structure of the data stored in each storage part of embodiment, (a) is a judgment standard information storage part, (b) is excavation situation information storage part. The flow chart explaining the processing procedure of the processing process of an embodiment. It is explanatory drawing explaining the evaluation process of the measured value in an embodiment, (a) is the measured value graph, (b) is the graph which extracted the drilling time zone, (c) is the measured value of the drilling time zone. The connected graph, (d) is a flow chart of the processing procedure. It is explanatory drawing explaining each graph in an embodiment, (a) is a column chart and N value corresponding to a depth, (b) is a depth-elapsed time graph, (c) is a depth-average excavation speed graph, (d). ) Shows a depth-water volume graph, and (e) shows a depth-current value graph. It is explanatory drawing explaining each graph in an embodiment, (a) is a columnar figure and N value corresponding to a depth, (b) is a depth-integrated current value graph, (c) is a depth-horizontal vibration analysis graph. (D) shows a depth-vertical vibration analysis graph. It is explanatory drawing explaining each graph in the modification example, (a) shows depth-elapsed time graph, (b) shows depth-average excavation speed graph, (c) shows depth-water volume graph.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. 1 to 6. In the present embodiment, the depth, the average excavation speed, and the amount of water according to the elapsed time are used as the speed index values for the excavation speed. Here, since the amount of water is increased when the excavation speed becomes slow, the amount of water is also used as a speed index value for the excavation speed.
FIG. 1A shows an excavator 10 for excavating a pile hole h0 for installing a pile of a building. The excavator 10 includes a base machine 11, a mast 14, and an auger machine 16. The base machine 11 includes a lower traveling body including a crawler 12 and an upper rotating body including an operation chamber 13.

The mast 14 is erected on the base machine 11. A wire for measuring the depth / speedometer is provided in the mast 14. An auger machine 16 is attached to the mast 14 so that it can be raised and lowered. The auger machine 16 includes a drive motor housed in the box and an excavation rod 17 that is rotationally driven by the drive motor. An excavation head 18 is attached to the tip (lower end) of the excavation rod 17. The excavation head 18 has an excavation blade formed at the tip of a pair (two) of swinging excavation arms. The raising and lowering of the excavation head 18 is controlled by the operator of the operation room 13.

Further, an excavator water supply device (not shown) for supplying excavation water to the excavation head 18 is connected to the excavator 10. The amount of the excavated water is adjusted by the operator of the operation room 13 according to the excavation condition.

As shown in FIG. 1B, the excavator 10 includes a drilling management system 20. The drilling management system 20 includes a computer terminal 30, a drilling depth measuring instrument 21, a flow rate measuring instrument 22, a current measuring instrument 23, a vibration measuring instrument 24, an input unit 25, and a display unit 26. Each measuring instrument (21 to 24) constantly performs measurement and transmits the measured value to the computer terminal 30. Here, the drilling depth measuring instrument 21 and the flow rate measuring instrument 22 function as measuring units for measuring the velocity index value.

The drilling depth measuring instrument 21 measures the amount of wire drawn out in the mast 14, and measures the drilling depth (depth) according to the position of the excavation head 18.
The flow rate measuring device 22 measures the injection flow rate of the excavated water supplied from the excavated water supply device.
The current measuring instrument 23 measures the load current of the drive motor of the auger machine 16.
The vibration measuring instrument 24 measures the vibration at the mounting location. In the present embodiment, the vibration measuring instrument 24 is attached to the operation room 13, the roof of the operation room 13, or the operation lever in the operation room 13. The vibration measuring instrument 24 measures vertical vibration and horizontal vibration.

The input unit 25 includes a keyboard, a pointing device, and the like arranged in the operation room 13, and is used for inputting various data to the computer terminal 30.
The display unit 26 includes a display or the like arranged in the operation room 13 and displays various data.

The computer terminal 30 acquires each measured value data from each measuring instrument (21 to 24). The computer terminal 30 includes a control unit 31, a determination reference information storage unit 35 as a reference information storage unit, and an excavation status information storage unit 36 as a measurement information storage unit.

The control unit 31 includes control means (CPU, RAM, ROM, etc.) and performs processes described later (each process such as a reference registration step, a measured value management step, a vibration analysis step, and an output management step). Therefore, by executing the drilling management program stored in the memory, the control unit 31 functions as a reference registration unit 311, a measured value management unit 312, a vibration analysis unit 313, and an output management unit 314.

The reference registration unit 311 executes a process of registering the determination reference information in the determination standard information storage unit 35.
The measured value management unit 312 functions as a recording unit, stores the measured values acquired from each measuring instrument (21 to 24) in a memory, evaluates the measured value at predetermined time intervals, and specifies the evaluation result. Specifically, the measured value management unit 312 specifies the velocity index value, the current value, and the vibration characteristic value in the time zone (drilling time zone) actually dug. In a hard stratum or the like, the excavation head 18 may be temporarily withdrawn immediately before digging. Therefore, as shown in FIG. 4A, the actual drilling depth of the excavation head 18 does not always increase monotonically with the elapsed time. Therefore, the measured value management unit 312 removes the period of lifting and stopping of the excavation head 18 (the shaded time zone of FIG. 4B) from the total working time, and is substantially used for drilling. Specify the measured value of the drilling time zone. The measured value management unit 312 concatenates the measured values in the specified drilling time zone to generate the graph shown in FIG. 4 (c).

The vibration analysis unit 313 executes the analysis process of the vibration characteristics by performing the frequency analysis of the vibration measured by the vibration measuring instrument 24. In the present embodiment, the vibration analysis unit 313 specifies the magnitude of vibration (for example, maximum amplitude, maximum acceleration, etc.) for each frequency band. Further, the vibration analysis unit 313 stores a concentration specifying table in order to display the magnitude of vibration as a density in a graph.
The output management unit 314 functions as an output unit, and displays on the display unit 26 a graph or the like in which each measured value at the time of excavation and the measured value according to the calculated depth are described.

As shown in FIG. 2A, the determination standard information storage unit 35 stores the determination standard information 350 used for determining the arrival at the support layer. In the present embodiment, the determination criterion information 350 includes a histogram 351 and a depth-N value graph 352 and a determination criterion graph 355 in association with the site identifier.

The histogram 351 is created based on the soil sample obtained in the boring survey at the construction site where the pile hole is excavated. The depth-N value graph 352 is created based on the standard penetration test data obtained in this boring survey.
Here, the histogram 351 and the depth-N value graph 352 shown in FIGS. 5 (a) and 6 (a) are recorded.

The judgment standard graph 355 is a reference value obtained by diverting the excavation status information of the pile hole already excavated at the construction site. The determination criterion graph 355 is generated and registered in the preceding excavation process (for example, the excavation process of the first pile hole) performed in the vicinity of the boring survey at the site specified by the site identifier. The judgment reference graph 355 includes a depth-elapsed time reference graph R1, a depth-average excavation speed reference graph R2, a depth-water volume reference graph R3, a depth-current value reference graph R4, a depth-integrated current value reference graph R5, and a depth-. A horizontal vibration analysis reference graph R6 and a depth-vertical vibration analysis reference graph R7 are included. Each reference graph (R1 to R7) is used as a reference for change of the corresponding graph (361-267) described later.

As shown in FIG. 2B, the excavation status information storage unit 36 stores the excavation status information 360 regarding the excavation status of the pile hole. The excavation status information 360 includes a depth-elapsed time graph 361, a depth-average excavation speed graph 362, a depth-water volume graph 363, a depth-current value graph 364, and a depth-integrated current value in association with the site identifier and the pile number. Includes graph 365, depth-horizontal vibration analysis graph 366, and depth-vertical vibration analysis graph 367. Each of the measured values in these graphs (361-267) is sequentially additionally recorded in the measured value management process described later.

As shown in FIG. 5B, the depth-elapsed time graph 361 is a graph in which the excavation depth (drilling depth) is on the vertical axis and the elapsed time (drilling time) is on the horizontal axis.
As shown in FIG. 5C, the depth-average excavation speed graph 362 is a graph in which the drilling depth is on the vertical axis and the average excavation speed is on the horizontal axis. This depth-average excavation velocity graph 362 is calculated by dividing a constant excavation range (eg, every 30 cm in depth) by the time required for it.

As shown in FIG. 5D, the depth-water volume graph 363 is a graph in which the drilling depth is on the vertical axis and the cumulative water volume is on the horizontal axis.
As shown in FIG. 5 (e), the depth-current value graph 364 is a graph in which the drilling depth is on the vertical axis and the instantaneous current value is on the horizontal axis.

As shown in FIG. 6B, the depth-integrated current value graph 365 is a graph in which the drilling depth is on the vertical axis and the integrated current value is on the horizontal axis.
As shown in FIG. 6C, the depth-horizontal vibration analysis graph 366 is a graph relating to the horizontal vibration characteristic value according to the drilling depth. In this depth-horizontal vibration analysis graph 366, the drilling depth is used on the vertical axis and the frequency is used on the horizontal axis, and the density is expressed according to the magnitude of vibration at each frequency.

As shown in FIG. 6D, the depth-vertical vibration analysis graph 367 is a graph relating to the vertical vibration characteristic value according to the drilling depth. In the depth-vertical vibration analysis graph 367, the drilling depth is used on the vertical axis and the frequency is used on the horizontal axis, and the density is expressed according to the magnitude of vibration at each frequency.

Next, a process of forming a pile hole will be described with reference to FIGS. 3 to 6 using the excavator 10 configured as described above. Here, it is assumed that a plurality of pile holes are formed on the site of the construction site.

<Boring survey process>
First, as shown in FIG. 3, a boring survey step is performed before excavation is performed. In this boring survey process, as is known, a geological survey is conducted on the site of the construction site. Columnar charts are generated according to the type of soil sample according to the depth obtained during this geological survey. In addition, the N value for each predetermined depth is acquired, and a depth-N value graph is generated.

Then, the control unit 31 of the computer terminal 30 is used to execute the registration process of the columnar chart and the depth −N value (step S1-1). Specifically, the reference registration unit 311 of the control unit 31 outputs the reference value registration screen to the display unit 26. This reference value registration screen includes an input field for registering data related to the histogram and graph data of N values according to the depth. The manager of the construction site inputs the site identifier, the column diagram, and the graph of the N value according to the depth on the reference value registration screen. The control unit 31 of the computer terminal 30 generates the determination reference information 350 in which the input site identifier, the columnar diagram 351 and the depth −N value graph 352 are recorded, and registers the determination reference information 350 in the determination reference information storage unit 35.

(Excavation process)
After that, the excavation process of each pile hole is performed. In this case, there is a preceding excavation step for generating the determination reference graph 355 and a subsequent excavation step for determining the arrival of the support layer using the generated determination reference graph 355. In the preliminary excavation process, a pile hole near the point where the boring survey was conducted is excavated. In the following, the preceding excavation process will be described first, and then the subsequent excavation process will be described.

<Advance excavation process>
In this preliminary excavation process, the computer terminal 30 of the drilling management system 20 starts the rotation of the drive motor of the auger machine 16 and inserts the drilling head 18 into the ground to start drilling.

In this case, first, the control unit 31 of the computer terminal 30 executes the output processing of the determination reference information (step S2-1). Specifically, the output management unit 314 of the control unit 31 displays an output screen including a display area for displaying each graph (361-267) on the display of the display unit 26.

Further, the output management unit 314 outputs a columnar diagram 351 and a depth-N value graph 352 of the determination reference information 350 corresponding to the depth of each graph (361-267) on this output screen.

Next, the control unit 31 of the computer terminal 30 executes the measurement value acquisition process (step S2-2). Specifically, the measured value management unit 312 of the control unit 31 acquires the measured values measured by each measuring instrument (21 to 24) at predetermined time intervals. Each time the measurement value acquisition process (step S2-2) is executed, the processes of steps S2-3 to S2-5 are executed.

Next, the control unit 31 of the computer terminal 30 is used to execute the evaluation process of the measured value (step S2-3). Specifically, the control unit 31 specifies a velocity index value, a vibration characteristic value, and a current value in the drilling time zone from each measured value acquired from each measuring instrument (21 to 24). The details of this process will be described later.

Next, the control unit 31 of the computer terminal 30 executes the output processing of the evaluation result (step S2-4). Specifically, the output management unit 314 of the control unit 31 adds the drilling depth in the drilling time zone specified in step S2-3 to the depth-elapsed time graph 361. Further, the output management unit 314 displays the average excavation speed, water amount, current value, integrated current value, and vibration characteristic value associated with the drilling depth stored in the memory in step S2-2 in each graph (362 to 367). Add to.

Then, the control unit 31 of the computer terminal 30 is used to execute the arrival determination process to the support layer (step S2-5). Specifically, it is determined whether or not the operator has reached the support layer by comparing the change of each measured value displayed on the display of the display unit 26 with the determination reference information 350.

For example, based on the columnar chart of FIG. 5 and the N value, it is shown that the portion shallower than about 6 m is soft geology. Further, about 6 m to about 7.6 m is a "sand mixed silty clay" layer, and about 7.6 to about 13 m is a "gravel" layer used as a support layer. Here, at a depth of about 7.6 m, the change in the elapsed time of the excavation depth is gradual, and the average excavation speed is significantly slowed down. Furthermore, the instantaneous current value at this time also gradually increases, and the rate of increase in the amount of water also increases. When excavating hard geology with an excavation blade, it becomes difficult to excavate. For this reason, changes in the elapsed time of excavation depth, changes in average excavation speed, changes in the rate of increase in water volume, and changes in current values indicate that hard geology is being excavated. Can be determined to have reached.

FIG. 6 is a measurement result at a construction site different from that of FIG. Based on the columnar chart of FIG. 6 and the N value, it is shown that the portion shallower than about 25 m is soft geology. In addition, about 25 m to about 27 m is a "fine sand" layer, about 27 m to about 28 m is a "gravel soil" layer, and about 28 m to about 30.5 m is a "silt-filled fine sand" layer, about 30.5 m to about. 32m is a "silt-filled sandy soil" layer, and about 32m to about 35m is a "silt" layer. In FIG. 6, at a depth of about 32 m, the magnitude of the vibration is large at around 7 Hz and 50 Hz to 60 Hz of the horizontal vibration. Further, at the same depth, the magnitude of the vibration increases at 30 Hz to 40 Hz of the vibration in the vertical direction. When excavating hard geology with a drilling blade, large vibrations may occur. Therefore, when a large vibration occurs in a specific frequency band, it can be determined that the "silt" layer, which is the support layer, has been reached because it is known that the hard geology is excavated at that depth. ..

Then, when it is determined that the support layer has been reached, the excavation head 18 is pulled out from the pile hole.
Here, when the rise corresponding to the pulling out of the excavation head 18 is detected, the control unit 31 of the computer terminal 30 executes the registration process of the determination reference graph (step S2-6). Specifically, the reference registration unit 311 of the control unit 31 uses each graph (361 to 567) registered in the excavation status information storage unit 36 as each graph (R1 to R7) of the determination reference graph 355 to determine the determination reference information. Record in the storage unit 35.

<Subsequent excavation process>
Next, the subsequent excavation process for determining the arrival of the support layer using the determination criterion graph 355 will be described.

In this subsequent excavation process, the computer terminal 30 of the drilling management system 20 starts the rotation of the drive motor of the auger machine 16 and inserts the drilling head 18 into the ground to start drilling.

In this case, first, the control unit 31 of the computer terminal 30 executes the output processing of the determination reference information (step S3-1). Specifically, the output management unit 314 of the control unit 31 has a display area for displaying each graph (361-267) on the display of the display unit 26 and each graph (361-267), as in step S2-1. ) Is displayed, and the output screen including the columnar diagram 351 and the depth-N value graph 352 corresponding to the depth is displayed.
Further, the output management unit 314 displays on this output screen so that each graph (R1 to R7) of the determination reference graph 355 of the determination reference information 350 corresponds to each graph (361-267).

Next, the control unit 31 of the computer terminal 30 performs the measurement value acquisition process (step S3-2), the measurement value evaluation process (step S3-3), and the evaluation result in the same manner as in steps S2-2 to S2-5. Output processing (step S3-4) and arrival determination processing to the support layer (step S2-5) are executed. The processes of steps S3-3 to S3-5 are executed each time the measured value acquisition process (step S3-2) is executed. Then, when it is determined that the support layer has been reached, the excavation head 18 is pulled out from the pile hole.

[Evaluation processing of measured values]
Next, the details of the above-mentioned measurement value evaluation process (step S2-3) will be described with reference to FIG. 4 (d).

First, the control unit 31 of the computer terminal 30 executes the process of acquiring the drilling depth of the excavation head (step S4-1). Specifically, the measured value management unit 312 of the control unit 31 acquires the drilling depth measured from the drilling depth measuring instrument 21 and temporarily stores it in the memory together with the acquired measurement time.

Then, the control unit 31 of the computer terminal 30 executes the extraction process of the drilling time zone (step S4-2). Specifically, the measured value management unit 312 of the control unit 31 has a depth of drilling depth temporarily stored in the memory, which is greater than or equal to the maximum value among the past drilling depths recorded in the excavation status information storage unit 36. To identify the drilling time zone where the depth is monotonically increasing. When the excavation head 18 is pulled up, the time when the excavation head 18 reaches the bottom of the hole is added to the drilling time zone again.

Next, the control unit 31 of the computer terminal 30 executes the process of specifying the measured value in the drilling time zone (step S4-3). Specifically, the measured value management unit 312 of the control unit 31 connects the drilling depths in the drilling time zone and calculates the elapsed time according to the drilling depth. Then, the measured value management unit 312 calculates the average excavation speed in the drilling time zone. Then, the measured value management unit 312 specifies the instantaneous current value in the drilling time zone, adds it to the integrated current value at the measurement time before that, and calculates the integrated current value. Further, the measured value management unit 312 adds the flow rate value in the drilling time zone to the cumulative water amount in the time before that to generate data on the water amount in the drilling time zone.

Next, the control unit 31 of the computer terminal 30 executes the frequency analysis process (step S4-4). Specifically, the vibration analysis unit 313 of the control unit 31 performs frequency analysis on the vibration in the drilling time zone, and specifies the magnitude (vibration characteristic value) of the vibration for each frequency band. Then, the measured value management unit 312 specifies the concentration according to the magnitude of the specified vibration in the concentration specifying table.

Next, the control unit 31 of the computer terminal 30 executes the process of associating the speed index value, the current value, and the vibration characteristic value with the depth (step S4-5). Specifically, the measured value management unit 312 of the control unit 31 determines the drilling depth, the average excavation speed, the amount of water, the instantaneous current value, the integrated current value, the vertical vibration characteristic value, and the horizontal vibration characteristic value via the measurement time. It is stored in the memory in association with (concentration according to the magnitude of vibration for each frequency band).

According to this embodiment, the following effects can be obtained.
(1) In the present embodiment, the control unit 31 of the drilling management system 20 displays a depth-elapsed time graph 361, a depth-average excavation speed graph 362, and a depth-water volume graph 363 regarding the elapsed time according to the drilling depth. Output to the display of the display unit 26. As a result, it is possible to determine the arrival of the drilling at the support layer from the temporal change of the drilling depth, the change of the average drilling speed of the drilling depth, the change of the velocity index value such as the change of the water amount, and the like.

(2) In the present embodiment, the control unit 31 of the drilling management system 20 outputs the depth-current value graph 364 and the depth-integrated current value graph 365 to the display of the display unit 26. As a result, it is possible to determine the arrival of the drilled hole in the support layer with reference to the change in the current value.

(3) In the present embodiment, the control unit 31 of the drilling management system 20 displays the columnar chart 351 and the depth-N value graph 352 acquired in the boring survey at the drilling site on the display of the display unit 26. Thereby, the arrival of the drilled hole in the support layer can be determined with reference to the columnar diagram 351 and the depth −N value 352.

(4) In the present embodiment, the control unit 31 of the drilling management system 20 displays the depth-horizontal vibration analysis graph 366 and the depth-vertical vibration analysis graph 367 on the display of the display unit 26. Thereby, it is possible to determine the arrival of the drilled hole in the support layer with reference to the change of the vibration in the vertical direction and the vibration in the horizontal direction.

(5) In the present embodiment, the control unit 31 of the drilling management system 20 registers each graph (361) registered in the excavation status information storage unit 36 in the registration process (step S2-6) of the determination standard graph of the preceding excavation process. ~ 367) is recorded as each graph (R1 to R7) of the determination criterion graph 355. Then, in the output processing (step S3-1) of the determination reference information of the subsequent excavation process, the control unit 31 displays each graph (R1 to R7) of the determination reference graph 355 of the determination reference information 350 into each graph (361-567). ) Is displayed. Therefore, it is possible to determine the arrival of the drilled hole in the support layer by referring to the change in the velocity index value or the like that has already been acquired at the same construction site.

Moreover, the said embodiment may be changed as follows.
In the above embodiment, the control unit 31 of the drilling management system 20 outputs the depth-elapsed time graph 361, the depth-average excavation speed graph 362, and the depth-water amount graph 363 to the display of the display unit 26. The operator of the excavator 10 excavates based on the temporal change of the drilling depth, the change of the average drilling speed of the drilling depth, the change of the speed index value such as the change of the water amount, etc. in each graph (361-363). The arrival of the hole at the support layer was determined. In this case, the control unit 31 of the computer terminal 30 may output information regarding the change in the speed index value to the display of the display unit 26. Specifically, the control unit 31 calculates and records the amount of change in each speed index value in the support layer using the determination reference graph 355, and displays the amount of change in each speed index value on the display. For example, in the depth-elapsed time graph 361 and the depth-water volume graph 363, the rate of increase in depth and water volume may be calculated, and in the depth-average excavation speed 362, the average value may be calculated.

As shown in FIG. 7A, the control unit 31 of the drilling management system 20 in the determination reference graph registration process (step S2-6) shows the depth-elapsed time graph after the support layer (here, about 7). The slope value of the approximate curve (here, the straight line of the linear approximate curve) L10 at a depth greater than .6 m) is calculated and recorded in the memory. Further, as shown in FIG. 7B, in the depth-average excavation speed graph, the average value L20 after the support layer is calculated and recorded in the memory. Further, as shown in FIG. 7C, in the depth-water volume graph, the slope value of the approximate curve (here, a straight line) L30 after the support layer is calculated and recorded in the memory.

After that, in the output processing of the determination reference information of the subsequent excavation process (step S3-1), the control unit 31 of the drilling management system 20 displays the recorded inclination values and average values L20 of the approximate curves L10 and L30 on the output screen. do. Then, when the control unit 31 adds a value to each graph in the evaluation result output process (step S3-4), in the depth-elapsed time graph, every predetermined time including the measurement time of the value to be added. Calculates the slope value of the approximate curve of and displays it on the output screen. Further, the control unit 31 calculates the average excavation speed and displays it on the output screen, and in the depth-water volume graph, calculates the slope value of the approximate curve for each predetermined time including the measurement time of the value to be added and displays it on the output screen. Display on. Thereby, the operator of the excavator 10 can determine that the drilling has reached the support layer.

Further, it may be determined that the control unit 31 of the computer terminal 30 has reached the support layer. Specifically, the control unit 31 has a slope value or an average value (L20) of the approximate curves (L10, L30) recorded in the memory, and a slope of the approximate curve calculated in the evaluation result output process (step S3-4). Compare the values and averages, respectively. As a result of comparison, when the slope value or average value of the approximate curve recorded in the memory and the slope value or average value of the calculated approximate curve match within a predetermined range, the support layer is reached. Is determined.

-In the above embodiment, in the registration process (step S2-6) of the judgment standard graph of the preceding excavation process, the control unit 31 of the drilling management system 20 provides the excavation status information 360 regarding the pile hole near the boring survey point. , Registered as a judgment standard graph 355. The judgment criterion graph 355 used in the subsequent excavation process is not limited to the excavation status information 360 regarding the pile holes in the vicinity of the boring survey point. For example, when a boring survey is conducted at a plurality of points, the excavation status information 360 of the pile hole constructed before this may be used, which is similar to the stratum structure of the pile hole to be constructed from these boring survey steps. In this case, a reference graph identification table in which the pile number (construction identifier) of the pile hole to be drilled in the subsequent excavation process is associated with the pile number (reference identifier) of the pile hole used as the judgment reference graph 355 is stored. .. When the control unit 31 of the drilling management system 20 acquires the construction identifier (pile number) of the drilling to be constructed in the subsequent excavation process, the reference identifier (pile number) associated with the construction identifier is specified in the reference graph. Identify using a table. The control unit 31 registers the excavation status information 360 of the specified reference identifier in the judgment standard information storage unit 35 as the judgment reference graph 355, and uses this judgment reference graph 355. As a result, it is possible to determine the arrival of the support layer while using the excavation status information 360 of the pile hole already drilled at a point close to the stratum structure of the pile hole to be actually constructed as the determination standard graph 355. Further, the judgment standard graph 355 is not limited to the case of using the excavation status information 360 obtained at the time of actually excavating the hole in which the pile is installed, but also using the excavation status information obtained at the time of experimentally excavating the hole. good.

-In the above embodiment, the arrival of the drilled hole in the support layer was determined by using the changes in the depth-elapsed time graph 361, the depth-average excavation velocity graph 362, and the depth-water volume graph 363 displayed on the display. In determining the support layer for drilling, it is not necessary to use all of depth-elapsed time, depth-average excavation speed, and depth-water volume, but it may be a part. In addition, other measured values indicating speed index values can be used in combination. Further, a statistical value of the excavation speed other than the average value of the excavation speed, for example, the median value or the maximum value of the excavation speed may be used.
-In the above embodiment, the vibration measuring instrument 24 is attached to the operation room 13, the roof of the operation room 13, or the operation lever in the operation room 13. The mounting position of the vibration measuring instrument 24 is not limited as long as it can detect vibration according to excavation, and may be, for example, an excavation rod 17.

h0 ... Pile hole, L10, L30 ... Approximate curve, L20 ... Average value, R1 ... Depth-elapsed time reference graph, R2 ... Depth-average excavation speed reference graph, R3 ... Depth-water volume reference graph, R4 ... Depth-current value Reference graph, R5 ... Depth-integrated current value reference graph, R6 ... Depth-horizontal vibration analysis reference graph, R7 ... Depth-vertical vibration analysis reference graph, 10 ... Excavator, 11 ... Base machine, 12 ... Crawler, 13 ... operation room, 14 ... mast, 16 ... auger machine, 17 ... drilling rod, 18 ... drilling head, 20 ... drilling management system, 21 ... drilling depth measuring instrument, 22 ... flow rate measuring instrument, 23 ... current measuring instrument, 24 ... Vibration measuring instrument, 25 ... Input unit, 26 ... Display unit, 30 ... Computer terminal, 31 ... Control unit, 35 ... Judgment standard information storage unit, 36 ... Excavation status information storage unit, 311 ... Standard registration unit, 312 ... Measurement value management unit, 313 ... Vibration analysis unit, 314 ... Output control unit, 350 ... Judgment standard information, 355 ... Judgment standard graph, 360 ... Excavation status information, 361 ... Depth-elapsed time graph, 362 ... Depth-average excavation speed Graph, 363 ... depth-water volume graph, 364 ... depth-current value graph, 365 ... depth-integrated current value graph, 366 ... depth-horizontal vibration analysis graph, 376 ... depth-vertical vibration analysis graph.

Claims (5)

It is a support layer arrival determination method for determining the arrival of a pile at a pile hole in a pile hole.
It is a speed index value about the excavation speed at the time of excavation of the pile hole, and the amount of excavation water supplied to the excavation head of the excavator excavating the pile hole at the time of the excavation according to the depth of the pile hole. Obtain the included speed index value and
The velocity index value is associated with the depth of the pile hole at the time of excavation,
A method for determining the arrival of a support layer, which determines the arrival at the support layer according to a change in the amount of water in the velocity index value. Examples speed index value, together with the water, the support layer arrival determination method according to claim 1 which comprises using at least one of the time it takes to drill the statistics and unit depth of drilling speed. The support layer arrival determination method according to claim 1 or 2, wherein the current value acquired at the time of excavating the pile hole is further used to determine the arrival at the support layer. A claim characterized in that the arrival at the support layer is determined by comparing the reference value for the velocity index value corresponding to the geology from the ground surface to at least the support layer with the velocity index value at the time of excavation. Item 3. The support layer arrival determination method according to any one of Items 1 to 3. It is a judgment support system for supporting the judgment of the arrival of the pile at the support layer of the pile hole.
It is a speed index value about the excavation speed at the time of excavation of the pile hole, and the amount of excavation water supplied to the excavation head of the excavator excavating the pile hole at the time of the excavation according to the depth of the pile hole. A measuring unit that measures the included speed index value,
A recording unit that records the speed index value in the measurement information storage unit in association with the depth of the pile hole at the time of excavation.
A determination support system including an output unit that outputs a change in the amount of water of a speed index value recorded in the measurement information storage unit.

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