Excavation tool position detection device, excavation accuracy management system, and excavation accuracy management method

Abstract

To quickly and accurately control the accuracy of drilling holes.SOLUTION: A drilling tool position detection device that detects a position of a drilling tool drilling into the ground comprises: a plurality of cable materials arranged in parallel so as to surround a rotating rod connected to the drilling tool; a distance measuring device for measuring a horizontal separation distance from the cable material; and a depth gauge for measuring a depth of the drilling tool. A length of the cable material varies in correspondence with the rotating rod.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a drilling tool position detection device for detecting the position of a drilling tool used to drill holes in the ground, a drilling accuracy management system, and a method for managing the accuracy of drilled holes. [Background technology]

[0002] Conventionally, when constructing underground structures such as concrete structures using boreholes drilled in the ground, the shape of the borehole is estimated by measuring the borehole wall and confirming the drilling accuracy. A widely known method for measuring borehole walls is the use of ultrasonic sensors, and for example, Patent Document 1 discloses a method for measuring the shape of a borehole using ultrasonic sensors.

[0003] The borehole shape measurement method described in Patent Document 1 involves lowering an ultrasonic sensor into the borehole, then rotating and raising the ultrasonic sensor while measuring the horizontal distance to the borehole wall. Next, based on the measurement results and the position and orientation of the ultrasonic sensor at the time of measurement, the three-dimensional position coordinates of the borehole wall are determined at multiple locations. Subsequently, the shape of the borehole wall is determined based on the three-dimensional position coordinates at multiple locations. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-273148 [Overview of the project] [Problems that the invention aims to solve]

[0005] As shown in Patent Document 1, employing an ultrasonic sensor allows for accurate determination of the shape of the borehole wall filled with stabilizing fluid. However, the above measurement process is time-consuming, and if the drilling accuracy needs to be checked repeatedly, drilling efficiency will decrease, potentially affecting the construction period.

[0006] Therefore, in order to reduce the number of times ultrasonic sensors are used for verification and shorten working time, the vertical accuracy of the excavator is sometimes checked visually by the excavator operator or supervisor. However, visual verification is subject to individual differences, making it easy for judgment criteria to become ambiguous and leading to problems such as delayed detection of hole curvature. If the hole curvature exceeds the acceptable range, corrective excavation becomes unavoidable, which can further delay the construction period.

[0007] This invention has been made in view of the above problems, and its main objective is to enable rapid and highly accurate precision control of boreholes. [Means for solving the problem]

[0008] To achieve this objective, the present invention provides a drilling tool position detection device for detecting the position of a drilling tool used to drill into the ground, wherein the device is arranged in parallel so as to surround a rotating rod connected to the drilling tool, The length of the rotating rod is variable in accordance with the aforementioned rotating rod, and one end is connected to the upper part of the excavating tool, while the other end is connected to a rotary table that rotates together with the rotating rod. Multiple cable-like members, a distance measuring device for measuring the horizontal distance between the cable-like members, and a depth gauge for measuring the depth of the excavating tool, The system includes a displacement detection device for detecting the displacement of the rotary table. It is characterized by the following:

[0010] The drilling accuracy management system of the present invention is a drilling accuracy management system for managing the drilling accuracy of a borehole formed by a drilling tool, and comprises a drilling tool position detection device and a shape monitoring device for monitoring the shape of the borehole, wherein the shape monitoring device comprises a drilling tool position calculation unit that calculates the position of the drilling tool based on measured values ​​from a distance measuring instrument and a depth gauge, and a borehole shape estimation unit that estimates the shape of the borehole based on the drilling tool position information calculated by the drilling tool position calculation unit.

[0011] A drilling accuracy management method for managing the drilling accuracy of a borehole formed by a drilling tool using the drilling accuracy management system of the present invention, characterized in that each time the rotation of the drilling tool is stopped, the horizontal distance from the cable-like material is measured with the distance measuring instrument, and the position of the drilling tool is calculated based on the measured values ​​of the distance measuring instrument and the depth gauge.

[0012] According to the drilling tool position detection device, drilling accuracy management system, and drilling accuracy management method of the present invention, the horizontal distance between the rotating rod and multiple cable-like materials arranged in parallel surrounding the rotating rod is measured using a distance measuring instrument at the start of drilling and after the start of drilling. This makes it possible to obtain the position of the rotating rod (or the position of the sighting point) on the scanning surface of the distance measuring instrument at the start of drilling and after the start of drilling.

[0013] Then, based on these positions and the depth of the drilling tool measured by the depth gauge, the three-dimensional position of the drilling tool can be obtained. Therefore, the shape of the borehole wall can be immediately estimated from the three-dimensional position of the drilling tool, making it possible to perform accuracy control of the borehole quickly and with high precision.

[0014] Furthermore, the task of measuring the horizontal separation distance between multiple cable-like materials using a distance measuring device can be performed when the rotation of the excavating tool is stopped, such as during the soil removal process. This allows for intermittent confirmation of the excavating tool's position without hindering the drilling operation, and makes it possible to detect signs of hole curvature. Therefore, the position of the excavating tool can be adjusted in the early stages of hole curvature, and the estimated hole wall shape can be used as reference information during the adjustment process.

[0015] Furthermore, by providing a displacement detection device that detects the displacement of the rotary table to which the cable-like material is connected, it becomes possible to capture the displacement that occurs above the cable-like material and the rotating rod at the start of drilling and after drilling has begun. This makes it possible to obtain the three-dimensional position of the drilling tool with higher accuracy. [Effects of the Invention]

[0016] According to the present invention, by using a plurality of cable-like members arranged in parallel surrounding a rotating rod, and a distance measuring device for measuring the horizontal distance between these cable-like members, the position of the drilling tool can be confirmed without hindering the drilling operation, and the shape of the borehole wall can be estimated from the position of the drilling tool, making it possible to quickly and accurately manage the accuracy of the borehole. [Brief explanation of the drawing]

[0017] [Figure 1] This is a diagram showing an overview of an excavator in an embodiment of the present invention. [Figure 2] This is a diagram showing the procedure of a hole drilling operation in an embodiment of the present invention. [Figure 3] This is a diagram showing an excavation accuracy management system and an excavation tool position detection device in an embodiment of the present invention. [Figure 4] This is a diagram showing a method for detecting the position of an excavation tool in an embodiment of the present invention (Part 1). [Figure 5] This is a diagram showing a method for detecting the position of an excavation tool in an embodiment of the present invention (Part 2). [Figure 6] This is a diagram showing a shape monitoring device in an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0018] The present invention uses a plurality of cord-like materials arranged in parallel around a rotating rod to detect the position of an excavation tool connected to the rotating rod, and manages the excavation accuracy based on the position of the excavation tool. The rotating rod may be any member that functions as a rotating shaft for transmitting a horizontal rotational force to the excavation tool, and the excavation tool may be any tool that is connected to the rotating rod and drills into the ground, such as an earth auger or a drilling bucket, and can be adopted for any of them.

[0019] In this embodiment, a kelly bar is adopted for the rotating rod and a drilling bucket is adopted for the excavation tool. Taking this case as an example, the details of the excavation tool position detection device, excavation accuracy management system, and excavation accuracy management method of the present invention will be described below while referring to FIGS. 1 to 6. Prior to this, first, an excavator equipped with a kelly bar and a drilling bucket will be described.

[0020] ≪≪≪Excavator 10≫≫≫ As shown in Figure 1, the excavator 10 has a boom 11 and a front arm 12 that are tiltable relative to a base machine (not shown), and a winch 11a is installed at the tip of the boom 11. A suspension rope 13 is wrapped around the winch 11a, and a Kelly bar 14 is suspended and supported via this suspension rope 13. The Kelly bar 14 is an extendable pipe, and a drilling bucket 15, which is an excavation tool, is attached to its tip.

[0021] The drilling bucket 15 consists of a cylindrical body with a drilling bit at its bottom 151, and drills holes in the ground by rotating integrally with the Kelly bar 14 as its pivot axis. The bottom 151 is configured to be openable and closable, and by opening it, excavated soil and other materials taken inside as drilling progresses can be discharged. The rotation of the drilling bucket 15 and Kelly bar 14 is achieved by a rotary drive device 16 attached to the tip of the front arm 12.

[0022] The rotary drive unit 16 is configured to be vertically movable relative to the Kelly bar 14, which is inserted vertically, and is equipped with a mechanism to apply rotational force to the Kelly bar 14. Below the rotary drive unit 16, a rotary table 18 is attached, which rotates together with the Kelly bar 14, and a hose reel 17 and various measuring instruments are installed on it. The measuring instruments include a depth gauge 80, which will be described later.

[0023] <<<Drilling work using drilling machine 10>>> The drilling operation of the ground using the excavator 10 having the above configuration is carried out in roughly the following steps.

[0024] First, the excavator 10 is set up in a predetermined position, and the drilling bucket 15 is positioned directly above the planned drilling location. Next, as shown in Figure 2(a), the rotary drive device 16 is activated to rotate the Kelly bar 14 and the drilling bucket 15, and the drilling bucket 15 is used to pre-drill the surface layer of the ground. Then, as shown in Figure 2(b), a surface casing P is installed in the pre-drilled area to protect the surface layer of the ground. After this, as shown in Figure 2(c), drilling work is resumed to drill the ground and construct the borehole H.

[0025] The drilling operation is carried out while supplying stabilizing fluid M, and when the drilling bucket 15 is filled with excavated soil, the rotation of the Kelly bar 14 and the drilling bucket 15 is stopped as shown in Figure 2(d). After this, the drilling bucket 15 is lifted to the ground and the soil is discharged. This operation of drilling the ground and discharging the excavated soil is repeated.

[0026] In this embodiment, at either the time before or after the discharge of the excavated soil, that is, when the rotation of the Kelly bar 14 and drilling bucket 15 has stopped, the drilling accuracy management system 20 shown in Figure 3 is used to detect the position of the drilling bucket 15. Based on the detection results, the shape of the borehole wall of the borehole H is estimated, and the drilling accuracy of the borehole H is managed.

[0027] <<<Drilling accuracy management system and drilling tool position detection device>>> As shown in Figure 3, the drilling accuracy management system 20 includes a shape monitoring device 30 and a drilling tool position detection device 40. The drilling tool position detection device 40 also includes a distance measuring instrument 50, a wire 60, a wire reel 70, and a depth gauge 80.

[0028] <<Excavator Position Detection Device 40>> Any instrument capable of detecting the depth of the drilling bucket 15 can be used as the depth gauge 80. In this embodiment, an example is given in which a depth gauge 80 that is pre-installed on the excavator 10 along with other measuring instruments is used.

[0029] Two wire reels 70 are installed in pairs on a rotary table 18 that rotates together with the Kelly bar 14, with the Kelly bar 14 in between. The wires 60 are suspended from each of the two wire reels 70 parallel to the Kelly bar 14. As shown in Figure 4(a), these paired wires 60 are arranged at equal intervals with respect to the Kelly bar 14 and symmetrically with respect to the Kelly bar 14.

[0030] As shown in Figure 1, the ends of each wire 60 are connected to the upper surface of the drilling bucket 15, which rotates with the Kelly bar 14, similar to the rotary table 18. This ensures that even during drilling, the pair of wires 60 always extend parallel to each other, and when the Kelly bar 14 extends, the wires are unwound from the wire reel 70 in response.

[0031] Any distance measuring instrument capable of measuring the horizontal separation distance to each of the paired wires 60 can be used as the distance measuring instrument 50, but a two-dimensional scanning type side-range sensor is preferred. When a side-range sensor is used, as shown in Figure 4(a), the separation distance to each of the paired wires 60 on the scanning plane can be measured simultaneously. In addition, polar coordinate data of the paired wires 60 on the scanning plane C with the side-range sensor as the origin O' (scan center position) can be acquired.

[0032] ≪≪Method for detecting the position of excavating tools≫≫ The procedure for detecting the three-dimensional position of the drilling bucket 15 using the drilling tool position detection device 40 having the above configuration will be explained below with reference to Figures 4 and 5, using the case where a two-dimensional scanning type side-range sensor is used for the distance measuring instrument 50 as an example.

[0033] In this embodiment, as shown in Figure 4(a), the origin O' on the scanning plane C of the distance measuring instrument 50 is defined as the scanning center position of the distance measuring instrument 50, the direction of focus is defined as the Y-axis, and the direction to the right of the plane perpendicular to the Y-axis is defined as the X-axis. Also, as shown in Figure 5, the origin O of the three-dimensional position of the drilling bucket 15 is assumed to be the point obtained by moving the origin O' on the scanning plane C to a height position where the depth gauge 80 reads 0m, and the downward direction on the plane perpendicular to the Y-axis is defined as the Z-axis.

[0034] For three-dimensional position detection, for example, as shown in Figure 4(a), the distance measuring device 50 is installed at a position where the horizontal separation distance from each of the paired wires 60 is the same. Also, as shown in Figure 5, the scanning surface C of the distance measuring device 50 is adjusted to be positioned above the upper end of the surface casing P. The distance from the height position where the depth gauge reads 0m to the scanning surface C is measured and defined as the scanning surface height H0. In addition, the distance between the scanning surface C and the rotary table 18 is measured and defined as the reference distance H1.

[0035] This allows the initial position coordinates of the drilling bucket 15 at the start of the drilling operation, as shown in Figure 5, to be determined by following the next procedure (0, Y C0 The initial position coordinates (0,Y) on the scanning plane C of the Kelly bar 14 can be calculated. First, as shown in Figure 4(a), the distance between the pair of wires 60 is measured with the distance measuring instrument 50 and the initial distance L1 is obtained. Then, from the obtained initial distance L1 and the distance between the wires L2, the initial position coordinates (0,Y) on the scanning plane C of the Kelly bar 14 can be calculated. C0 Therefore, by measuring the depth D0 of the drilling bucket 15 at the time drilling starts with the depth gauge 80, the initial position coordinates (0,Y) of the drilling bucket 15 can be obtained. C0 It is possible to measure D0).

[0036] Furthermore, as shown in Figure 5, the position coordinates (X,Y,Z) of the drilling bucket 15 after the drilling operation has started are first measured using a distance measuring instrument 50 to obtain the horizontal distance to the pair of wires 60, as shown in Figure 4(b), and the measured distances L3 and L4 are obtained. Then, from the obtained measured distances L3 and L4 and the distance between the wires L2, the position coordinates (X) of the Kelly bar 14 on the scanning plane C are obtained.C ,Y C ) can be obtained.

[0037] Next, the depth of the drilling bucket 15 is measured using the depth gauge 80, and the distance between the drilling bucket 15 and the rotary table 18 is calculated as the drilling tool height H2 (H2 = H0 + H1 + D). Thus, the position coordinates (X, Y, Z) of the drilling bucket 15 are determined by the reference distance H1, the drilling tool height H2, and the initial position coordinates (0, Y) of the Kelly bar 14 on the scanning plane C. C0 ,H0) and position coordinates (X after drilling starts C ,Y C It can be calculated based on H0).

[0038] As described above, the drilling tool position detection device 40 makes it easy to obtain the three-dimensional position coordinates of the drilling bucket 15, with the origin O being the point where the scan center position of the distance measuring instrument 50 is moved to a height position where the depth gauge reads 0m. This allows for quick and easy detection of the position of the drilling bucket 15, and from this position information, it is possible not only to confirm the position of the drilling bucket 15 but also to estimate the shape of the borehole wall of the borehole H.

[0039] ≪≪Shape monitoring device 30≫≫ The shape monitoring device 30 can be any device equipped with an input unit 31, an arithmetic processing unit 32, and an output unit 33, as shown in Figure 6, and can be a personal computer, notebook PC, tablet terminal, etc.

[0040] The input unit 31 is connected wirelessly or via wire to the distance measuring instrument 50 and the depth gauge 80, and receives information such as the measured distance L3 and L4 between each pair of wires 60 acquired by the distance measuring instrument 50, and the measured depth D of the drilling bucket 15 acquired by the depth gauge 80. Although not shown in the diagram, the input unit 31 may also be connected to input devices such as a keyboard, mouse, or scanner, and the input unit 31 may be configured to receive information from these devices.

[0041] The output unit 33 includes a data output unit 331 and an alarm output unit 332. The data output unit 331 outputs information acquired via the input unit 31 and processed data processed by the arithmetic processing unit 32 to the display device 34. The alarm output unit 332 outputs alarm information to the display device 34 when the drilling tool position verification unit 323 of the arithmetic processing unit 32, described later, detects an abnormality in the position of the drilling bucket 15.

[0042] The display device 34 may be a monitor connected to the output unit 33 wirelessly or via a wired connection, or it may be any other display, printer, etc. Furthermore, the alarm information output from the alarm output unit 332 may be output not only to the display device 34, but also to an output device capable of providing audio notification, such as a speaker.

[0043] Furthermore, the terminal devices 35, such as mobile terminals carried by workers or management computers installed in the construction office, and the shape monitoring device 30 may be made capable of mutual data transmission via a communication network. In this case, information can be input from the terminal device 35 to the shape monitoring device 30 via the input unit 31, or information can be output from the shape monitoring device 30 to the terminal device 35 via the output unit 33. The communication network may be constructed using the internet, a dedicated communication line, or any other method.

[0044] The arithmetic processing unit 32 includes a CPU (Central Processing Unit), a memory unit such as ROM (Read Only Memory) and RAM (Random Access Memory), and controls the operation of the shape monitoring device 30. Such an arithmetic processing unit 32 includes at least a drilling tool position calculation unit 321, a hole shape estimation unit 322, and a drilling tool position verification unit 323. Details will be explained in the drilling accuracy management method using the drilling accuracy management system 20, but the outline is as follows.

[0045] The boring tool position calculation unit 321 calculates the position coordinates (X, Y, Z) of the drilling bucket 15 as described in the boring tool position detection method described above based on the actually measured separation distances L3 and L4 acquired by the distance measuring instrument 50 of the boring tool position detection device 40 and the actually measured depth D acquired by the depth gauge 80, and detects the position information.

[0046] The hole shape estimation unit 322 estimates the shape of the hole wall based on the position information of the drilling bucket 15 detected by the boring tool position calculation unit 321 and the cross-sectional diameter of the drilling bucket 15. Then, the boring tool position verification unit 323 determines whether it is necessary to correct the position of the drilling bucket 15 based on the position information of the drilling bucket 15 and the determination threshold value of the preset position coordinates.

[0047] ≪≪Drilling accuracy management method using a drilling accuracy management system≫≫ A procedure for detecting the position of the drilling bucket 15 and managing the drilling accuracy of the drilled hole H formed by the drilling bucket 15 using the drilling accuracy management system 20 having the above configuration will be described below.

[0048] ≪≪Preparations≫≫ First, install the boring tool position detection device 40 at a predetermined position. As shown in FIG. 1, install a wire reel 70 paired with the rotary table 18, unwind the wire 60, and connect its tip to the upper surface of the drilling bucket 15. The paired wires 60 are arranged at equal intervals and in parallel with the kelly bar 14 interposed therebetween. These operations may be performed at any stage before or after the prior drilling by the drilling machine 10 as shown in FIG. 2(a).

[0049] Next, as shown in FIG. 3, insert the drilling bucket 15 into the surface casing P and install the distance measuring instrument 50. At the same time, as shown in FIG. 4(a), the initial position coordinates (0, Y c0 ) on the scanning surface C of the kelly bar 14 and the initial position coordinates (0, Y0, D0) of the drilling bucket 15 at the start of the hole drilling operation are calculated. These operations are as described in the above ≪≪Boring tool position detection method≫≫.

[0050] Furthermore, if the drilling bucket 15 shifts in position as the drilling operation progresses, an acceptable upper limit is calculated in advance. Based on this upper limit and the initial position coordinates (0, Y0, D0) of the drilling bucket 15, a position coordinate determination threshold is set to determine whether or not position correction is necessary.

[0051] The information obtained during the above preparation is stored in the calculation processing unit 32 of the shape monitoring device 30 via the input unit 31. After this, as shown in Figure 2(c), drilling work is started with the drilling bucket 15 while supplying the stabilizing fluid M.

[0052] <<Drilling operation and detection of drilling tool position>> The drilling operation is performed by operating the rotary drive device 16 to rotate the Kelly bar 14 and the drilling bucket 15. During the drilling operation, the paired wire 60 also rotates together with them, so the position detection operation of the drilling bucket 15 is performed each time the drilling bucket 15 stops.

[0053] As mentioned above, once the drilling bucket 15 is filled with excavated soil, the rotation of the drilling bucket 15 is temporarily stopped, as shown in Figure 2(d), in preparation for discharging the excavated soil. During this preparation period before the drilling bucket 15 is withdrawn from the borehole H, the horizontal separation distance between it and the paired wires 60 is measured using the distance measuring instrument 50, and the measured separation distances L3 and L4 are obtained. Similarly, the measured depth D of the drilling bucket 15 is obtained using the depth gauge 80.

[0054] Alternatively, the drilling bucket 15 may be withdrawn from the borehole H to remove the soil, then reinserted into the borehole H. Before rotating the drilling bucket 15 to begin drilling, a measurement procedure may be performed.

[0055] When the shape monitoring device 30 receives measured distance values ​​L3 and L4 and measured depth value D via the input unit 31, the calculation processing unit 132 receives a command from the drilling tool position calculation unit 321 and calculates the position coordinates (X, Y, Z) of the drilling bucket 15. The method for calculating the position coordinates is as described in the above section "Method for detecting the position of the drilling tool".

[0056] The position detection of the drilling bucket 15 is performed by directly using the calculated position coordinates (X, Y, Z) of the drilling bucket 15 as position information. Alternatively, statistical processing is performed by calculating the position coordinates multiple times and then calculating the mean, median, or mode, and the result of this statistical processing is used as position information.

[0057] When calculating position coordinates multiple times, it is advisable to operate the rotary drive device 16 of the excavator 10 to rotate the Kelly bar 14 and drilling bucket 15 slightly each time measurement work is performed, thereby appropriately changing the position of the pair of wires 60 visible from the distance measuring device 50. This allows for the acquisition of position information of the drilling bucket 15 with higher accuracy.

[0058] <<<Estimation of the borehole wall shape>>> Once the position information of the drilling bucket 15 is acquired, the calculation processing unit 132 receives a command from the hole shape estimation unit 322 and estimates the shape of the hole wall of the excavated hole H.

[0059] The borehole wall shape can be calculated based on the initial position coordinates (0, Y0, D0) and position coordinates (X, Y, Z) of the drilling bucket 15, and the cross-sectional diameter of the drilling bucket. The estimated borehole wall shape may be stored in the memory area of ​​the calculation processing unit 622, or it may be output to the display device 624 as a two-dimensional model or a three-dimensional model, for example, as shown in Figure 5.

[0060] <<Verification of the necessity of position correction>> Furthermore, once the position coordinates (X, Y, Z) of the drilling bucket 15 are calculated, the calculation processing unit 132 receives a command from the drilling tool position verification unit 323 and compares it with a preset judgment threshold. If the judgment threshold is exceeded, it is determined that the position of the drilling bucket 15 needs to be corrected.

[0061] If the arithmetic processing unit 32 determines that a position correction is necessary, it sends a warning message to the display device 34 via the alarm output unit 332. When the worker receives the warning message on the display device 34, they temporarily suspend the operation of the rotary drive unit 16 and refer to the position coordinates (X, Y, Z) of the drilling bucket 15 and the estimated hole wall shape. Based on this, they can then take appropriate action, such as adjusting the position of the drilling bucket 15.

[0062] The above procedure is repeated until the borehole H reaches the desired depth. In this way, the measurement work using the distance measuring device 50 can be performed at times when the rotation of the drilling bucket 15 is stopped, such as during the soil removal process. This allows the position of the drilling bucket 15 to be checked intermittently without interfering with the drilling work, and makes it possible to detect signs of hole curvature in the borehole H. Therefore, the position of the drilling bucket 15 can be adjusted in the early stages of hole curvature, and the estimated borehole wall shape of the borehole H can be used as reference information during the adjustment.

[0063] The drilling tool position detection device, drilling accuracy management system, and drilling accuracy management method of the present invention are not limited to the embodiments described above, and it goes without saying that various modifications are possible without departing from the spirit of the present invention.

[0064] For example, in this embodiment, as shown in Figure 4(a), the wires 60 are arranged in parallel at equal intervals with the Kelly bar 14 in between, but this is not the only option. The horizontal distance from the distance measuring instrument 50 can be measured, and the position coordinates (X) of the Kelly bar 14 on the scanning plane C are also available. c ,Y c If you can obtain ), the wire 60 and Kelly bar 14 do not necessarily have to be at equal intervals, and the number of wire 60s can be anything.

[0065] Furthermore, in this embodiment, a common wire 60 with a cross-sectional diameter of about 6 mm, which is available on the market, was used as the cable-like material. However, any thickness or material is acceptable as long as it can be recognized by the distance measuring instrument 50 and its length can be varied to correspond to the Kelly bar 14.

[0066] Furthermore, the excavator position detection device 40 may also include a displacement detection device 90 for detecting the displacement of the rotary table 18. The rotary table 18 is cantilevered via a front arm 12 provided on a base machine (not shown). Therefore, it may be displaced horizontally or vertically due to unforeseen circumstances.

[0067] Therefore, a displacement detection device 90 capable of detecting the displacement of the rotary table 18 is prepared at the start and after the drilling operation, and the displacement information is stored in the calculation processing unit 32 of the shape monitoring device 30 via the input unit 31. Then, the calculation processing unit 32, upon receiving a command from the drilling tool position calculation unit 321, can calculate the position coordinates (X, Y, Z) of the drilling bucket 15, taking into account the displacement of the rotary table 18.

[0068] As the displacement detection device 90, for example, as shown in Figure 2(d), a wire can be used with one end fixed to a stationary position such as the ground and the other end connected to the rotary table 18 via a reel or the like. In this case, by using a side-range sensor in the distance measuring instrument 50, the horizontal separation distance and angle (polar coordinate data) on the scanning plane C of the wire, which is the displacement detection device 90, can be obtained. Therefore, if displacement occurs in the rotary table 18, the displacement of the rotary table 18 can be determined based on the horizontal separation distance and angle (polar coordinate data) at the start of the drilling operation and after the start, and the stationary position to which one end of the displacement detection device 90 is fixed.

[0069] Furthermore, in this embodiment, the wire reel 70 is installed on the rotary table 18 and the wire 60 is connected to the top of the drilling bucket 15, but the invention is not limited to this. For example, if there are any members that rotate together with the Kelly bar 14 near the rotary table 18, or members that rotate together with the Kelly bar 14 near the top of the drilling bucket 15, these may be used as appropriate. [Explanation of symbols]

[0070] 10 Excavators 11 Boom 11a Winch 12 Front Arm 13. Suspension rope 14 Kelly Bar (Rotating Rod) 15. Drilling bucket (excavation tool) 151 Bottom 16 Rotary drive device 17 Hose Reel 18 Rotary Table 20. Drilling Accuracy Management System 30 Shape monitoring device 31 Input section 32 Arithmetic Processing Unit 321 Excavation tool position calculation unit 322 Hole shape estimation section 323 Excavation tool position verification unit 33 Output section 331 Data Output Section 332 Alarm output section 34 Display device 35 Terminal devices 40. Excavator position detection device 50 Distance Measuring Devices 60 Wire (rope-like material) 70 Wire Reels 80 depth gauge 90 Displacement detection equipment H drilled hole P Surface Casing M stabilizer L1 initial distance L2 wire distance Measured distance of L3 Measured distance of L4 H0 Scanning plane height (distance from depth 0m point to the scanning plane) H1 reference distance (distance from scanning surface to rotary table) H2 drilling tool height (distance from drilling tool to rotary table) Depth of the drilling bucket at the start of D0 drilling D. Depth of the drilling bucket after drilling has begun.

Claims

1. A drilling tool position detection device for detecting the position of a drilling tool used to bore holes in the ground, Multiple cable-like members are arranged in parallel to surround the rotating rod connected to the drilling tool, their length is variable in accordance with the rotating rod, one end is connected to the upper part of the drilling tool, and the other end is connected to a rotary table that rotates together with the rotating rod, A distance measuring device for measuring the horizontal distance from the cable-like material, A depth gauge for measuring the depth of the aforementioned excavating tool, An excavator position detection device characterized by comprising a displacement detection device for detecting the displacement of the rotary table.

2. A drilling accuracy management system for managing the drilling accuracy of a borehole formed by a drilling tool, The excavator position detection device according to claim 1, The system includes a shape monitoring device for monitoring the shape of the borehole, The shape monitoring device is A drilling tool position calculation unit calculates the position of the drilling tool based on the measured values ​​of the distance measuring instrument and the depth meter, Based on the position information of the drilling tool calculated by the drilling tool position calculation unit, a hole shape estimation unit estimates the shape of the drilled hole, A drilling accuracy management system characterized by having the following features.

3. A drilling accuracy management method for managing the drilling accuracy of a borehole formed by a drilling tool using the drilling accuracy management system described in claim 2, Each time the rotation of the excavating tool is stopped, the horizontal distance from the cable-like material is measured using the distance measuring device. A method for managing drilling accuracy, characterized by calculating the position of the drilling tool based on the measured values ​​of the distance measuring instrument and the depth meter.

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