Boring device

Abstract

To reliably prevent accidental rotation of a boring apparatus due to forgetting to install an anchor at startup or poor installation of the anchor during operation.SOLUTION: An anchor installation detection apparatus 80 for detecting tensile force of an anchor strut 60 is connected between the anchor strut 60 and a base 50. (1) When the anchor struts 60 are not normally installed at two or more places at startup, or (2) when tensile force of at least one anchor strut 60 deviates from a predetermined normal range during operation, power transmission to a spindle is automatically cut off by a rotation limiting apparatus 110. In a case where a power transmission cutting state to the spindle is kept, when the anchor struts 60 are normally installed at two or more places, manual operation of a spindle switching lever 27a is enabled by an operator pushing a spindle rotation limiting release button of an anchor installation state monitoring board 120.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a boring device, and more particularly to a boring device capable of reliably preventing accidental rotation of the boring device due to forgetting to install an anchor at startup or poor anchor installation during operation.

Background Art

[0002] Conventionally, a method has been practiced in which a casing rod is rotationally penetrated into soft ground, and a slurry-like hardening material (grout) is high-pressure injected into the ground from an injection nozzle at the tip of the casing rod to form a ground improvement body (cylindrical consolidated body) (see, for example, Patent Document 1). Such a method is called a high-pressure injection method, a high-pressure injection stirring method, a jet grout method, etc.

[0003] In this high-pressure injection method, first, the casing rod is lowered to the lowest end position of the ground improvement body to be formed, and then the rod is rotated while high-pressure injecting the hardening material horizontally from the injection nozzle at the tip of the casing rod to form the lowest layer of the ground improvement body. Thereafter, the casing rod is raised by a predetermined height, and similarly, the layer one level above the ground improvement body is formed. Thus, by sequentially raising the casing rod at every predetermined height and high-pressure injecting the hardening material horizontally while rotating, a ground improvement body having an overall cylindrical shape can be formed.

[0004] The ground improvement machine (boring device) used for this high-pressure injection method is equipped with a swivel head (rotation drive device) that rotates the casing rod at a predetermined speed and a feed cylinder (feeding device) that moves the swivel head in a predetermined direction. The swivel head consists of a spindle with a center hole that fixes the casing rod coaxially. Generally, the spindle is driven by an electric motor or a hydraulic motor via a gear mechanism (power transmission mechanism). The power transmission mechanism consists of a clutch section that disconnects / connects (disconnects and disconnects) the rotational power, a transmission section that changes the rotational power input from the clutch section to a desired rotational speed, and a spindle engagement / disengagement section that engages (restrained) / disengages (free) the gear connection of the power transmission mechanism to the spindle.

[0005] Incidentally, when the spindle rotates and the drilling bit attached to the tip of the casing rod is drilling into the ground, there are cases where the drilling bit bites into the ground, causing the spindle to become unable to rotate (jamming). In this case, the boring device receives a counter-moment force from the ground via the casing rod. This counter-moment force acts to cause the boring device to slide. When this counter-moment force exceeds the static friction force (grounding force) of the boring device, the boring device will be rotated around the casing rod.

[0006] Therefore, in order to prevent unexpected rotation of the boring machine due to jamming, boring machines equipped with a swivel head (spindle) are required to have anchors installed before starting up.

[0007] Furthermore, an anchor tension detection device is known in which a plate to which a strain sensor is attached is compressed by the anchor head and anchor plate in order to detect the tension (tensile force) of the anchor (see, for example, Patent Document 2). [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2009-249903 [Patent Document 2] Japanese Patent Publication No. 2008-70205 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The anchor tension detection device described in Patent Document 2 above detects whether the anchor is properly installed using a strain sensor. However, Patent Document 3 above does not disclose any safety measures for when the anchor is not properly installed.

[0010] In particular, if an operator forgets to install anchors and operates the boring machine without them, jamming can occur, causing the boring machine to rotate around the casing rod. In the worst case, workers working near the boring machine could be caught in the machine.

[0011] Therefore, the present invention has been made in view of the problems of the prior art described above, and its purpose is to provide a boring device that can reliably prevent accidental rotation of the boring device due to forgetting to install anchors at startup or improper installation of anchors during operation. [Means for solving the problem]

[0012] A boring apparatus according to the present invention for achieving the above objective includes a power generating device (10) that generates rotational power, a rotary drive device (40) that rotates a casing rod for drilling a hole in the ground, a feeding device (30) that feeds the casing rod in a predetermined direction, a power transmission device (20) that transmits the power generated by the power generating device (10) to the rotary drive device (40), and the power generating device (10), the power transmission device (20), the feeding device (30), and the rotary drive device (40). The system comprises a base (50) to which the base (50) is attached, a plurality of anchor guy wires (60) that prevent the base (50) from rotating, a tensile force detection device (80) that detects the tensile force of the anchor guy wires (60), a rotation limiting device (110) that disconnects power transmission to the rotation drive device (40), and a control unit (70) that determines whether or not to release the power transmission disconnection state to the rotation drive device (40) by the rotation limiting device (110) in conjunction with the detection result of the tensile force detection device (80). Occasionally, In at least one of the tensile force detection devices (80) 、 The control unit (70) is configured to stop supplying power to the power generator (10) and disconnecting power transmission to the rotary drive unit (40) when the tensile force of the anchor guy wire (60) deviates from a predetermined normal range.

[0013] In the above configuration, the tensile force detection device (80) constantly monitors the installation status of the anchor guy wire (60), and only when the tensile force of the anchor guy wire (60) is within the normal range can the power transmission disconnection state to the rotary drive device (40) by the rotation limiting device (110) be released. In other words, if the anchor is not installed at startup, the tensile force of the anchor guy wire (60) will not be within the normal range. As a result, the power transmission disconnection state to the rotary drive device (40) by the rotation limiting device (110) cannot be released, and the rotary drive device (40) cannot be started. This ensures that accidental rotation of the boring device due to forgetting to install the anchor at startup is reliably prevented.

[0014] Furthermore, if the tensile force of the anchor guy wire (60), which was within the normal range at startup, deviates from the normal range during operation, the control unit (70) activates the rotation limiting device (110), and the power transmission to the rotary drive unit (40) is again cut off. In addition, the control unit (70) stops the power supply to the power generator (10), and since the power transmission to the rotary drive unit (40) is eliminated, the rotation of the casing rod is stopped. This ensures that accidental rotation of the boring device due to improper anchor installation during operation is reliably prevented.

[0015] A second feature of the boring apparatus according to the present invention is that the tensile force detection device (80) includes a hydraulic cylinder (84) through which the axial center portion passes, a first body (81) and a second body (82) that sandwich the hydraulic cylinder (84) along the axial center portion and engage with the anchor guy wire (60) or the base (50), and fasteners (85, 86) that pass through the axial center portion and fasten the first body (81) and the second body (82).

[0016] In the above configuration, the first body (81), the second body (82), and the fasteners (85, 86) balance the hydraulic pressure (F1) of the hydraulic cylinder (84), the fastening force (F2) of the fasteners (85, 86), and the tensile force (F3) of the anchor guy wire (60), thereby enabling the hydraulic cylinder (84) to be stably fixed. This makes it possible to constantly monitor the normal / abnormal state of the anchor installation by measuring the hydraulic pressure (F1) of the hydraulic cylinder (84).

[0017] A third feature of the boring apparatus according to the present invention is that the hydraulic cylinder (84) of the tensile force detection device (80) has a pressure detection joint (92) that incorporates a pressure sensor.

[0018] In the above configuration, it becomes easy to extract the hydraulic pressure (F1) from the hydraulic cylinder (84) from the tensile force detection device (80). This makes it easy to detect the tensile force (F3) of the anchor guy wire (60).

[0019] The fourth feature of the bowling device according to the present invention is that when the tensile force of the anchor line (60) deviates from a predetermined normal range in at least one of the tensile force detection devices (80), the control unit (70) stops the power supply to the power generation device (10) and cuts off the power transmission to the rotary drive device (40).

[0020] In the above configuration, when the tensile force of the anchor line (60) is normal at the start of the device, and during subsequent operation, the anchor line (60) loosens and the tensile force becomes too small, or when the bowling device tries to rotate due to jamming and the tensile force of the anchor line (60) becomes too large, the power generation device (10) will lose power and no rotational power will be transmitted to the rotary drive device (40).

[0021] The fifth feature of the bowling device according to the present invention is that it has display means (121) for displaying whether the tensile force of the anchor line (60) is normal or abnormal, and / or a rotation restriction release button (123) for releasing the power transmission cut-off state for the rotary drive device (40).

[0022] In the above configuration, it is possible to easily detect abnormal points regarding the anchor installation, and it is also possible to easily detect that the abnormal anchor installation state has become normal.

[0023] The sixth feature of the bowling device according to the present invention is that when the rotation restriction release button (123) is pressed, the control device (70) releases the power transmission cut-off state for the rotary drive device (40) by the rotation restriction device (110) only when the tensile force of the anchor line (60) indicates within a predetermined normal range at a predetermined location or more.

[0024] In the above configuration, even when the rotation restriction release button (123) is pressed, if the tensile force of the anchor branch line (60) does not indicate within a predetermined normal range at a predetermined location or more, the power transmission cut-off state for the rotation drive device (40) will not be released. Further, whether the tensile force of the anchor branch line (60) is within a predetermined normal range can be known by the display means (121). Thereby, it is possible to surely prevent forgetting to install the anchor at the start.

Effect of the Invention

[0025] According to the bowling device of the present invention, it is possible to surely prevent accidental rotation of the bowling device due to forgetting to install the anchor at the start or poor anchor installation during operation.

Brief Description of the Drawings

[0026] [Figure 1] It is an explanatory view showing the bowling device according to the present invention. [Figure 2] It is a block diagram showing the configuration of the anchor control unit according to the present invention. [Figure 3] It is an explanatory view showing the anchor installation state monitoring panel according to the present invention. [Figure 4] It is a perspective view and a front view of the anchor installation detection device according to the present invention. [Figure 5] It is a sectional view taken along the line A - A of FIG. 4(b). [Figure 6] It is a front view and a perspective view of the rotation restriction device according to the present invention. [Figure 7] It is an explanatory view showing the hydraulic system of the rotation restriction measure according to the present invention. [Figure 8] It is a skeleton view showing the power transmission path from the rotation motor to the spindle. [Figure 9] It is an explanatory view showing the inoperable state of the spindle on / off lever by the rotation restriction device. [Figure 10] It is an explanatory view showing the operable state of the spindle on / off lever. [Figure 11]This is an explanatory diagram showing the state in which power transmission to the spindle is permitted by the spindle on / off lever. [Modes for carrying out the invention]

[0027] Embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0028] Figure 1 is an explanatory diagram showing a boring apparatus 100 according to the present invention. Figure 1(a) is a front view of the boring apparatus 100, and Figure 1(b) is a right side view of the boring apparatus 100. Note that the anchor guy wire 60 and the anchor installation detection device 80 are not shown in Figure 1(b).

[0029] This boring device 100 is configured to excavate to a predetermined depth while rotating and penetrating a casing rod (not shown) into the ground, and to perform high-quality ground improvement such as the jet grouting method or the injection mixing method. The casing rod is equipped with multiple outlets for ejecting slurry-like hardening material (grout). Therefore, the hardening material supplied from a grout pump (not shown) on the ground through the inside of the casing rod can be injected into the ground. The hardening material injected into the ground can create cylindrical columnar improved piles in the ground. Examples of hardening materials used include cement milk.

[0030] Furthermore, the boring device 100 is configured to constantly monitor the anchor installation status (tensile force of the anchor guy wires 60) while energized, and to implement safety measures that prevent the power transmission to the swivel head 40 (spindle 42 (Figure 8)) from being disconnected if the anchor guy wires 60 are not properly installed in two or more locations on the device at startup. In other words, the spindle 42 (Figure 8) is configured to rotate only when the anchor guy wires 60 are properly installed in two or more locations.

[0031] Furthermore, if the tensile force of at least one anchor guy wire 60 deviates from a preset normal range during operation of the swivel head 40, the motor 10, which is the power source for the swivel head 40, is emergency stopped, and the power transmission to the swivel head 40 is cut off as a safety measure. Details of these safety measures will be described later with reference to Figures 4 to 11.

[0032] The mechanical configuration of this boring device 100 includes a rotary motor 10 that generates rotational power, a power transmission mechanism 20 that transmits the rotational power generated by the rotary motor 10 to the swivel head 40, a feed cylinder (feeding means) 30 for raising and lowering the swivel head 40, a swivel head (rotation drive device) 40 that applies rotational torque to the casing rod, a base 50 to which the rotary motor 10, power transmission mechanism 20, feed cylinder 30 and swivel head 40 are attached, an anchor guy wire 60 that suppresses the rotation of the entire device while the swivel head 40 is in operation, an anchor installation detection device 80 that monitors the tensile force of the anchor guy wire 60, a rotation limiting device 110 that works in conjunction with the anchor installation detection device 80 to prevent power from being transmitted to the swivel head 40, and an anchor installation status monitoring panel 120 that displays the anchor installation status. Each of these components will be described below.

[0033] The rotary motor 10 can be an AC motor driven by, for example, a three-phase 220V AC power supply 10b (Figure 2) with a frequency of 60Hz. In this embodiment, the rotary motor 10 can be operated either directly, or by selecting one of the following methods: direct-on-line operation, where AC power is supplied directly to the rotary motor 10, or inverter operation, where AC power is input to an inverter 10c (Figure 2) to convert it to a desired frequency before being supplied to the rotary motor 10. Generally, the direct-on-line operation method can be used in excavation processes where excavation is performed to a predetermined depth, while the inverter operation method can be used in ground improvement processes where the jet grout method is implemented. The rotational power generated by the rotary motor 10 is taken into the power transmission mechanism 20, converted to a desired rotational speed, and then input to the swivel head (spindle) 40. The power transmission path to the swivel head (spindle) 40 will be described later with reference to Figure 8.

[0034] The power transmission mechanism 20 consists of a clutch section (Figure 8) that disconnects / connects (hereinafter referred to as "connecting and disconnecting") the transmission of rotational power from the rotary motor 10, a transmission section (Figure 8) that converts the rotational power transmitted from the rotary motor 10 to a desired rotational speed, a counter section (Figure 8) that transmits the rotational power transmitted from the transmission section (Figure 8) in parallel, and a spindle on / off section (synchronizer section) (Figure 8) that transmits the rotational power transmitted from the counter section to the spindle drive shaft 28 (Figure 7). Details of the power transmission mechanism 20 will be described later with reference to Figure 8.

[0035] The clutch lever 16a is an operating lever used by the operator to manually engage and disengage the clutch. The gear change lever 21a is an operating lever used by the operator to manually change the rotational speed of the swivel head 40 to 1st gear, 2nd gear, and reverse 1st gear.

[0036] The high / low speed selector lever 25a is an operating lever that allows the operator to set the rotational speed range of the swivel head 40 to a rotational speed range higher than 2nd speed or reverse 1st speed (3rd speed, 4th speed, reverse 2nd speed). The spindle on / off lever 27a is an operating lever that synchronizes (rotationally synchronizes) the gear G16 (Figure 8), which receives the rotational power of the rotary motor 10, with the spindle drive shaft 28 (Figure 8).

[0037] The feed cylinder 30 has a cylinder 31, one part of which is fixed to the swivel head 40, and the other part which contacts and slides against the feed support frame 54. The rod 32 has one end fixed to the feed support frame 54, and the other end slides inside the cylinder 31.

[0038] The swivel head 40 is comprised of a final speed change unit 41 (Figure 8) that changes the rotational power transmitted from the spindle drive shaft 28 (Figure 8) to a predetermined rotational speed, and a spindle 42 (Figure 8) that rotates a casing rod (not shown).

[0039] The pipe clamp section 40' has four cylinders 40a' that grip a casing rod (not shown), arranged at equal circumferential intervals of 90° at central angles toward the center. Adjacent cylinders 40a' are connected by pins (not shown). Of the four cylinders 40a', two diagonally opposite cylinders 40a' are supported by clamp brackets 40b'. The clamp brackets 40b' are fixed to the upper base 51.

[0040] The base 50 comprises an upper base 51 to which the rotary motor 10, power transmission mechanism 20, pipe clamp section 40', and feed support frame 54 are attached; a lower base 52 that is joined to the upper base 51 and faces the ground; and a slide hanger 53 that restricts relative movement between the lower base 52 and the upper base 51 in the vertical (up and down) and lateral (direction perpendicular to the longitudinal direction). The lower base 52 and the upper base 51 are connected by a slide cylinder (not shown). Therefore, when the slide cylinder (not shown) extends and retracts, the upper base 51 slides on the lower base 52. Conversely, when the outtrigger 50' is in contact with the ground and the lower base 52 is lifted off the ground, when the slide cylinder (not shown) extends and retracts, the lower base 52 slides on the upper base 51.

[0041] The anchor guy wire 60 can be a chain block that fixes the boring device 100 (base 50) to a structure (not shown) with a predetermined tensile force. The anchor guy wire 60 is connected to the boring device 100 via an anchor installation detection device 80 that detects the tensile force. Details of the anchor installation detection device 80 will be described later with reference to Figures 4 and 5.

[0042] The rotation limiting device 110 disconnects the power transmission from the rotary motor 10 to the spindle drive shaft 28. This disconnection is released by the control unit 72 (Figure 2) based on the tensile force of the anchor guy wire 60 (anchor installation state). Details of the rotation limiting device 110 will be described later with reference to Figures 6 and 7.

[0043] Figure 2 is a block diagram showing the configuration of the anchor control unit 70, which performs safety measures based on the anchor installation status. The anchor control unit 70 comprises an anchor installation status monitoring panel 120 that displays the anchor installation status, and a control unit 72 that receives the hydraulic signal (pressure signal) from the anchor installation detection device 80 to measure the tensile force of the anchor guy wire 60, and releases the power transmission disconnection state of the rotation limiting device 110 to the swivel head 40 based on the measurement result of the tensile force. Each of these components will be described in more detail below.

[0044] The anchor installation status monitoring panel 120 is configured to include a normal / abnormal indicator lamp 121 that shows whether the anchor installation status is normal or abnormal for each anchor guy wire 60, a monitoring device operation lamp 122 that shows the power transmission disconnection status to the spindle 42 (Figure 8), and a spindle rotation limit release button 123 that makes the power transmission disconnection status to the spindle 42 (Figure 8) by the rotation limiting device 110 available (allowing manual operation by the spindle on / off lever 27a). Here, "anchor installation status" refers to the tension state of the anchor guy wire 60. Quantitatively, it refers to the tensile force F3 of the anchor guy wire 60, and this tensile force F3 is balanced by the oil pressure F1 of the hydraulic cylinder 84 (Figure 5) of the anchor installation detection device 80 and the fastening force F2 of the body fixing bolt 85 (Figure 5) and body fixing nut 86 (Figure 5). This will be explained later with reference to Figure 5. The following describes each component in more detail.

[0045] The normal / abnormal indicator lamp 121 lights up green when the anchor installation is normal. On the other hand, if the tensile force F3 of the anchor guy wire 60 falls below the lower limit of the normal range, it lights up red, for example. On the other hand, if the tensile force F3 exceeds the upper limit of the normal range, it lights up red, for example. In this embodiment, since there are four anchor installation locations on the front, back, left, and right sides of the boring device 100, there are four normal / abnormal indicator lamps 121.

[0046] The monitoring device operation lamp 122 indicates whether or not the power transmission disconnection state to the spindle 42 (Figure 8) has been released. If the power transmission disconnection state to the spindle 42 (Figure 8) has been released, it is displayed as, for example, a solid green light. On the other hand, if the power transmission disconnection state to the spindle 42 (Figure 8) has not been released, it is displayed as, for example, a blinking green light.

[0047] The spindle rotation limit release button 123 only activates the control unit 72 to release the power transmission disconnection state to the spindle 42 (Figure 8) by the rotation limiting device 110 (making it possible to manually operate the spindle on / off lever 27a) if two or more normal / abnormal indicator lamps 121 are lit green. Therefore, if two or more normal / abnormal indicator lamps 121 are not lit green, the power transmission disconnection state to the spindle 42 (Figure 8) by the rotation limiting device 110 will not be released even if the operator presses the spindle rotation limit release button 123.

[0048] The control unit 72 consists of a microcontroller or a PLC (Programmable Logic Controller). The control unit 72 receives hydraulic signals (pressure signals) from the pressure sensors 92 (Figure 4) of each anchor installation detection device 80 to measure the tensile force on the anchor guy wires 60, and based on the tensile force measurement result, it illuminates the corresponding normal / abnormal indicator lamp 121 in a predetermined color and flashing / on state.

[0049] For example, if the tensile force on the anchor guy wire 60 is within a predetermined normal range, the control unit 72 illuminates the corresponding normal / abnormal indicator lamp 121 in a green state. On the other hand, if the tensile force on the anchor guy wire 60 deviates from the predetermined normal range, the control unit 72 illuminates the corresponding normal / abnormal indicator lamp 121 in a red flashing state (when it is below the lower limit) or in a red solid state (when it is above the upper limit).

[0050] Furthermore, when the spindle rotation limit release button 123 is pressed, the control unit 72 determines whether or not to release the power transmission disconnection state to the spindle 42 (Figure 8) by the rotation limiting device 110 (making it possible to manually operate the spindle using the on / off lever 27a). If the power transmission disconnection state by the rotation limiting device 110 is to be released, the control unit 72 switches the extension / retraction switching unit 117 from the "extend" contact to the "retract" contact. When the contact in the extension / retraction switching unit 117 switches from the "extend" contact to the "retract" contact, the direction of the current flowing to the electric motor 112a is reversed. As a result, the rotation direction of the electric motor 112a is reversed, and the cylinder rod 111a of the rotation limiting device 110 retracts. When the power transmission disconnection state by the rotation limiting device 110 is released, manual operation using the spindle on / off lever 27a becomes possible.

[0051] Furthermore, the control unit 72 stops supplying power to the rotary motor 10 if the tensile force of at least one anchor guy wire 60 deviates from a predetermined normal range while the spindle 42 (Figure 8) is rotating. Specifically, if the rotary motor 10 is powered directly from the AC power supply 10b, the control unit 72 opens the motor circuit breaker 10d. On the other hand, if the rotary motor 10 is powered via the inverter 10c, the control unit 72 opens both the inverter inlet circuit breaker 10e and the inverter outlet circuit breaker 10f.

[0052] In addition to stopping the power supply to the rotary motor 10, the control unit 72 switches the extension / retraction switch 117 from the "retracted" contact to the "extended" contact, thereby cutting off power transmission to the spindle 42 (Figure 8). When the extension / retraction switch 117 switches from the "retracted" contact to the "extended" contact, the direction of the current flowing to the electric motor 112a is reversed. As a result, the rotation direction of the electric motor 112a is reversed, and the cylinder rod 111a of the rotation limiting device 110 extends. Further details will be described later with reference to Figure 7.

[0053] Figure 3 is an explanatory diagram showing an example of the anchor installation status monitoring panel 120 according to the present invention. This anchor installation status monitoring panel 120 has four normal / abnormal indicator lamps 121 in the center, arranged around a schematic diagram 100' of the boring device 100, corresponding to the actual anchor installation locations on the boring device 100. The arrangement of these four normal / abnormal indicator lamps 121 allows the operator to instantly check the anchor installation status for each anchor guy wire 60.

[0054] As an example of the lamp display state, of the four normal / abnormal indicator lamps 121, the upper left normal / abnormal indicator lamp 121 is lit green, indicating that the anchor guy wire 60 is properly installed. The upper right normal / abnormal indicator lamp 121 is off, indicating that the anchor guy wire 60 is not connected to a structure (not shown).

[0055] Furthermore, the normal / abnormal indicator lamp 121 in the lower right is lit red, indicating that the tensile force of the anchor guy wire 60 exceeds the upper limit of the normal range. The normal / abnormal indicator lamp 121 in the lower left is blinking red, indicating that the tensile force of the anchor guy wire 60 is below the lower limit of the normal range.

[0056] Furthermore, below the four normal / abnormal indicator lamps 121, there is a monitoring device operation lamp 122 and a spindle rotation limit release button 123. When all four anchor installation detection devices 80 are energized and the control unit 72 is receiving hydraulic signals (pressure signals) from each hydraulic cylinder 84 (Figure 5), the monitoring device operation lamp 122 lights up green.

[0057] Furthermore, in the above example of the display of the four normal / abnormal indicator lamps 121, only the anchor guy wire 60 on the front left side is properly installed. In other words, the above example of the display of the four normal / abnormal indicator lamps 121 does not satisfy the condition that anchor guy wires 60 are properly installed in two or more locations. Therefore, even if the spindle rotation limit release button 123 is pressed, the power transmission disconnection state to the spindle 42 (Figure 8) by the rotation limiting device 110 will not be released. The anchor installation detection device 80 will be described below.

[0058] Figures 4 and 5 are explanatory diagrams showing the configuration of the anchor installation detection device 80 according to the present invention. Figure 4(a) is a perspective view of the anchor installation detection device 80. Figure 4(b) is a front view of the anchor installation detection device 80. Figure 5 is a cross-sectional view of AA in Figure 4(b). For the sake of explanation, the cover 94 is omitted in Figure 4(a).

[0059] As shown in Figure 5, the anchor installation detection device 80 includes a first body 81 having a stepped through-hole 81a for housing and fixing a hydraulic cylinder 84, a second body 82 housing the first body 81, a stopper 83 to prevent the hydraulic cylinder 84 from loosening relative to the first body 81, a hydraulic cylinder 84 that generates an oil pressure F1 to counteract the fastening force F2 of the body fixing bolts 85 and body fixing nuts 86, body fixing bolts 85 and body fixing nuts 86 that simultaneously fix the first body 81, the second body 82, and the hydraulic cylinder 84, a screw 87 that fixes the stopper 83 to the first body 81, a first shackle 88 connecting the first body 81 to the boring device 100, and a second shackle 89 connecting the second body 82 to the anchor guy wire 60 (Figure 1).

[0060] As shown in Figures 4(a) and 4(b), the anchor installation detection device 80 further includes a T-type joint 91 for connecting a pressure sensor 92, a pressure sensor 92 for detecting the pressure of the hydraulic fluid (oil), a hydraulic supply port 93 for filling with hydraulic fluid (oil), a cover 94 covering these, and a cover fixing plate 95 for fixing the cover 94.

[0061] Returning to Figure 5, the first body 81 consists of a cylindrical portion with a stepped through-hole 81a formed along the central axis CL, and a U-shaped portion to which the first shackle 88 is connected. A female thread is formed on the inner surface of the lower step of the stepped through-hole 81a. This female thread is screw-connected to a male thread formed on the outer surface of the cylinder 84a of the hydraulic cylinder 84. On the other hand, the upper step of the stepped through-hole 81a is designed to accommodate the cylinder rod 84b of the hydraulic cylinder 84.

[0062] Multiple female threaded portions 81c are formed on the lower surface of the first body 81 along the axial direction. When these female threaded portions 81c engage with the screw 87, the stopper 83 is fixed to the lower surface of the first body 81. As a result, the cylinder 84a of the hydraulic cylinder 84 is stably fixed in a sandwiched state between the first body 81 and the stopper 83.

[0063] The second body 82 consists of a cylindrical portion into which the first body 81 is fitted and a U-shaped portion to which the second shackle is connected. The second body 82 is then fastened with body fixing bolts 85 and body fixing nuts 86 while housing the assembly of the first body 81 and the stopper 83. In this case, in the hydraulic cylinder 84, the hydraulic pressure F1 (pushing force) of the cylinder rod 84b, the fastening force F2 of the body fixing bolts 85 and body fixing nuts 86, and the tensile force F3 of the anchor guy wire 60 (Figure 1) are balanced as follows. [Equation 1]: The above fastening force F2 = the above oil pressure F1 + the above tensile force F3

[0064] The fastening force F2 is constant. Therefore, taking the time-dependent derivative of both sides of equation 1, we get 0 = ΔF1 + ΔF3, which means ΔF1 = -ΔF3. This indicates that the absolute values ​​of the time-dependent change in oil pressure ΔF1 and the time-dependent change in tensile force ΔF3 are equal but opposite in direction. In other words, if the initial value of the tensile force F3 is known (for example, it is possible to set the initial value to zero), the tensile force F3 of the anchor guy wire 60 (Figure 1) can also be measured by measuring the time-dependent change in oil pressure ΔF1 of the hydraulic cylinder 84. This allows for setting a normal range for the tensile force F3 of the anchor guy wire 60 (Figure 1), thereby preventing the forgetting to install anchors when starting the boring device 100, and enabling the detection of loosening of the anchor guy wire 60 or signs of unexpected rotation of the boring device 100 due to jamming, etc., during the operation of the boring device 100. Furthermore, if the tensile force of the anchor guy wire 60 deviates from the normal range during operation of the boring device 100, the boring device 100 will emergency stop the rotary motor 10 and cut off power transmission to the spindle 42 (Figure 8) using the rotation limiting device 110.

[0065] The stopper 83 is joined to the lower surface of the first body 81 while supporting the hydraulic cylinder 84, and is fixed to the first body 81 by a screw 87. Therefore, the stopper 83 has multiple through holes 83b for the screws 87 to pass through.

[0066] The hydraulic cylinder 84 is a single-acting center-hole hydraulic cylinder having a center hole that penetrates along the axial center. The center hole formed in the axial center is through which the body fixing bolt 85 passes.

[0067] The hydraulic cylinder 84 consists of a cylinder 84a fixed between the first body 81 and the stopper 83, and a cylinder rod 84b having a piston integrally formed at its tip and sliding inside the cylinder 84a.

[0068] As shown in Figure 4(a), the cylinder 84a has one oil port 90 for supplying / discharging hydraulic fluid (oil). A T-connector 91 is connected to the oil port 90. A pressure sensor 92 is connected to one end of the T-connector 91, and a hydraulic supply port 93 is connected to the other end.

[0069] Returning to Figure 5, the cylinder 84a of the hydraulic cylinder 84 is sandwiched between the first body 81 and the stopper 83 and fastened by a screw 87. The hydraulic cylinder 84, gripped by the first body 81 and the stopper 83, is then supported by the second body 82, and the cylinder rod 84b is fastened by body fixing bolts 85 and body fixing nuts 86.

[0070] The screw 87 passes through the through hole 83b of the stopper 83 and engages with the female threaded portion 81c of the first body 81. Next, the rotation limiting device 110 will be described.

[0071] Figure 6 is an explanatory diagram showing the configuration of the rotation limiting device 110 according to the present invention. Figure 6(a) is a front view of the rotation limiting device 110. Figure 6(b) is a perspective view of the rotation limiting device 110.

[0072] As shown in Figure 6(a), the rotation limiting device 110 includes a hydraulic cylinder 111 that swings the spindle on / off lever 27a from side to side in the figure (with the shaft 27b as the pivot point), a hydraulic cylinder drive unit 112 that drives the hydraulic cylinder 111, a bracket 113 that supports the hydraulic cylinder 111 and the hydraulic cylinder drive unit 112, an engaging portion 114 attached to the tip of the hydraulic cylinder 111, a connecting shaft 116 that engages with the engaging portion 114, and a connecting plate 115 that connects the shaft 27b of the spindle on / off lever 27a to the connecting shaft 116. Each of these components will be described below.

[0073] The hydraulic cylinder 111 is a double-acting hydraulic cylinder having two oil chambers (Figure 7) through which hydraulic fluid flows in and out. When hydraulic fluid is supplied to the left oil chamber 111b (Figure 7) on the left side of the diagram, the cylinder rod 111a extends to the right side of the diagram. On the other hand, when hydraulic fluid is supplied to the right oil chamber 111c (Figure 7) on the right side of the diagram, the cylinder rod 111a retracts to the left side of the diagram. Note that the cylinder rod 111a in Figure 6(a) is in the retracted state.

[0074] The hydraulic cylinder drive unit 112 consists of an electric motor, a hydraulic pump driven by the electric motor, a hydraulic circuit that switches the flow of hydraulic fluid, and an oil tank that stores hydraulic fluid. Details of this hydraulic cylinder drive unit 112 will be described later with reference to Figure 7.

[0075] The bracket 113 is fixed to the frame of the boring machine 100. A mounting plate 113a is screwed to the underside of the bracket 113.

[0076] As shown in Figure 6(b), the mounting plate 113a is fitted with a hinge support portion 113b that rotatably supports the bottom side of the hydraulic cylinder 111 with the hinge pin 113b1 as a pivot point, and a support portion 113c that supports the lower end of the hydraulic cylinder drive portion 112.

[0077] Figure 7 is an explanatory diagram showing the hydraulic system of the rotation limiting measure 110 according to the present invention. For the sake of explanation, when the electric motor 112a is rotating in reverse, hydraulic fluid is discharged from port B of the hydraulic pump 112b, and when the electric motor 112a is rotating in forward direction, hydraulic fluid is discharged from port A of the hydraulic pump 112b. Also, when the electric motor 112a is rotating in reverse, the current flows from right to left in the diagram, and when the electric motor 112a is rotating in forward direction, the current flows from left to right in the diagram.

[0078] The hydraulic cylinder drive unit 112 includes an electric motor 112a that drives the hydraulic pump 112b, a reversible hydraulic pump 112b capable of flowing hydraulic fluid from port B to port A or from port A to port B, a switching valve 112c that connects either port A or port B to the oil tank 112j, a right pilot check valve 112d that uses the line pressure PA on port A as the pilot pressure, a left pilot check valve 112e that uses the line pressure PB on port B as the pilot pressure, a right flow control valve 112f that suppresses the rapid outflow of hydraulic fluid from the right oil chamber 111c, a left flow control valve 112g that suppresses the rapid outflow of hydraulic fluid from the left oil chamber 111b, and the right oil chamber 111 The hydraulic cylinder drive unit 112 is configured to include a right first relief valve 112h that returns the hydraulic fluid to the oil tank 112j when the line pressure on the c side exceeds a predetermined threshold, a left first relief valve 112i that returns the hydraulic fluid to the oil tank 112j when the line pressure on the left oil chamber 11b side exceeds a predetermined threshold, a right second relief valve 112k that returns the hydraulic fluid to the oil tank 112j when the line pressure PB on the port B side exceeds a predetermined threshold, a left second relief valve 112L that returns the hydraulic fluid to the oil tank 112j when the line pressure PA on the port A side exceeds a predetermined threshold, a manual valve 112m that returns the hydraulic fluid from the left oil chamber 111b and the right oil chamber 111c to the oil tank 112j, and an oil tank 112j for storing the hydraulic fluid. The operation of the hydraulic cylinder drive unit 112 will be described below.

[0079] First, when the electric motor 112a reverses direction, the line pressure PB on port B of the hydraulic pump 112b exerts an oil pressure (line pressure PB on port B of the hydraulic pump 112b) that attempts to move the valve body (not shown) of the switching valve 112c to the left in the diagram. When the line pressure PB exceeds the elastic force of the spring of the switching valve 112c, the valve body (not shown) moves to the left in the diagram, and ports P1 and P3 become connected.

[0080] As a result, hydraulic fluid is drawn from the oil tank 112j into port A of the hydraulic pump 112b and discharged from port B. The hydraulic fluid discharged from port B of the hydraulic pump 112b is supplied to the right oil chamber 111c through the right pilot check valve 112d, and the cylinder rod 111a moves to the left side in the diagram (retracts). Furthermore, the line pressure PB on the port B side of the hydraulic pump 112b allows the left pilot check valve 112e to allow the hydraulic fluid to flow in the reverse direction from the left oil chamber 111b to port A.

[0081] Therefore, when the cylinder rod 111a moves to the left (towards the left oil chamber 111b), the hydraulic fluid expelled from the left oil chamber 111b passes through the left pilot check valve 112e, some of which is drawn into port A of the hydraulic pump 112b, and the remainder passes through the switching valve 112c and is returned to the oil tank 112j. When the cylinder rod 11a contacts the left end, the line pressure PB on the port B side rises. If the line pressure PB exceeds a predetermined threshold, the right second relief valve 112k opens, and the excess hydraulic fluid is returned to the oil tank 112j.

[0082] On the other hand, when the electric motor 112a rotates forward, the line pressure PA on port A of the hydraulic pump 112b causes the valve body (not shown) of the switching valve 112c to experience an oil pressure (line pressure PA on port A of the hydraulic pump 112b) that attempts to move it to the right in the diagram. When the line pressure PA exceeds the elastic force of the spring of the switching valve 112c, the valve body (not shown) moves to the right in the diagram, and ports P2 and P3 become connected.

[0083] As a result, hydraulic fluid is drawn from the oil tank 112j into port B of the hydraulic pump 112b and discharged from port A. The hydraulic fluid discharged from port A of the hydraulic pump 112b is supplied to the left oil chamber 111b through the left pilot check valve 112e, and the cylinder rod 111a moves (extends) to the right in the diagram. Furthermore, the line pressure PA on the port A side of the hydraulic pump 112b allows the right pilot check valve 112d to allow the hydraulic fluid to flow in the reverse direction from the right oil chamber 111c to port B.

[0084] Therefore, when the cylinder rod 111a moves to the right (towards the right oil chamber 111c), the hydraulic fluid expelled from the right oil chamber 111c passes through the right pilot check valve 112d, some of which is drawn into port B of the hydraulic pump 112b, and the remainder passes through the switching valve 112c and is returned to the oil tank 112j. When the cylinder rod 11a contacts the right end, the line pressure PA on the port A side rises. If the line pressure PA exceeds a predetermined threshold, the left second relief valve 112L opens, and the excess hydraulic fluid is returned to the oil tank 112j.

[0085] Thus, when the electric motor 112a rotates in the forward direction, the cylinder rod 11a of the hydraulic cylinder 111 extends. On the other hand, when the electric motor 112a rotates in the reverse direction, the cylinder rod 11a of the hydraulic cylinder 111 retracts.

[0086] Incidentally, if the electric motor 112a is not energized, the hydraulic pump 112b stops. As a result, the line pressure PA on port A of the hydraulic pump 112b and the line pressure PB on port B become equal, and the valve body (not shown) of the switching valve 112c balances in the neutral position (neither port is connected). As a result, the hydraulic fluid in the right oil chamber 111c is sealed by the right pilot check valve 112d, and the hydraulic fluid in the left oil chamber 111b is sealed by the left pilot check valve 112e. Then, if the hydraulic fluid pressure exceeds a predetermined threshold due to a rise in temperature or the like, the left first relief valve 112h or the right first relief valve 112i opens and returns the excess hydraulic fluid to the oil tank 112j.

[0087] Furthermore, in an emergency, by manually moving the valve body (not shown) of the manual valve 112m to the upper right of the diagram, both port P1 and port P2 will communicate with port P3, thereby returning the hydraulic fluid from the left oil chamber 111b and the right oil chamber 111c to the oil tank 112j.

[0088] In summary, the electric motor 112a rotates in either the forward or reverse direction, causing the cylinder rod 111a to extend or retract. In this embodiment, the forward / reverse rotation of the electric motor 112a is switched by the control unit 72 via an extension / retraction switching unit 117 that switches the direction of the current flowing to the electric motor 112a.

[0089] Figure 8 is a skeleton diagram showing the power transmission path from the rotary motor 10 to the spindle 42. For the sake of explanation, the shaft 27b of the rotation limiting device 110 and the shaft 27b on the pinion shaft 27 are shown separately, but the shaft 27b is a coaxial, integrated structure.

[0090] The power generated by the rotary motor 10 is first input to the first input shaft 12-1 via the V-belt 11. The power input to the first input shaft 12-1 is then input to the second input shaft 12-2 via the clutch plate 14. In the normal state, the clutch plate 14 is pressed and engaged with the pressure plate 13 by the spring 15a of the clutch cover 15. When the clutch lever 16a is pushed down, the clutch boss 16 moves to the left side in the diagram, releasing the press engagement between the clutch plate 14 and the pressure plate 13.

[0091] The power input to the second input shaft 12-2 is shifted by gears G1 and G2 before being input to the geared shaft 21. By operating the gear change lever 21a to move gear G6 of the first spline shaft 22 to the upper left of the diagram and mesh with gear G4 of the geared shaft 21, or by moving gear G5 of the first spline shaft 22 to the upper right of the diagram and mesh with gear G3 of the geared shaft 21, or by moving gears G8 and G9 of the second spline shaft 23 to the upper right of the diagram and meshing gears G8 and G9 of the second spline shaft 23 with gear G4 of the geared shaft 21 and gear G6 of the first spline shaft 22, respectively, the power input to the geared shaft 21 is shifted by gears G7 and G10 before being input to the geared first counter shaft 24.

[0092] Here, by operating the high / low speed switching lever 25a to move the gear G12 of the geared counterspline shaft 25 to the upper right in the diagram and mesh it with the gear G11 of the geared first countershaft 24, or by moving the gear G12 of the geared counterspline shaft 25 to the upper left in the diagram and directly connecting the first spline shaft 22 and the geared counterspline shaft 25, the power input to the geared shaft 21 is shifted by gears G13 and G14 before being input to the geared second countershaft 26.

[0093] Incidentally, the low-speed mode occurs when gear G12 of the geared counterspline shaft 25 and gear G11 of the geared first counterspline shaft 24 mesh together. On the other hand, the high-speed mode occurs when the first spline shaft 22 and the geared counterspline shaft 25 are directly connected.

[0094] Therefore, in low-speed mode, when gear G6 of the first spline shaft 22 and gear G4 of the geared shaft 21 mesh, it is 1st gear. On the other hand, in low-speed mode, when gear G5 of the first spline shaft 22 and gear G3 of the geared shaft 21 mesh, it is 2nd gear. Also, in low-speed mode, when gear G8 and gear G9 mesh with gear G4 and gear G6 respectively, it is reverse 1st gear.

[0095] Furthermore, in high-speed mode, when gear G6 of the first spline shaft 22 meshes with gear G4 of the geared shaft 21, it is considered 3rd gear. On the other hand, in high-speed mode, when gear G5 of the first spline shaft 22 meshes with gear G3 of the geared shaft 21, it is considered 4th gear. Also, in high-speed mode, when gear G8 and gear G9 mesh with gear G4 and gear G6 respectively, it is considered reverse 2nd gear.

[0096] The power input to the geared second countershaft 26 is changed in speed by gears 15 and G16, causing gear G16 to rotate freely. Gear G16 is a gear that rotates freely relative to the pinion shaft 27. An internal gear G17 is mounted coaxially to gear G16. The pinion shaft 27 has a spline groove, into which an external gear G18, which can mesh with gear G17, is fitted. Therefore, gear G18 always rotates together with the pinion shaft 27. In other words, gear G18 is synchronized with the pinion shaft 27.

[0097] Furthermore, gear G18 is constantly engaged with shifter 27c and can move along the axial direction of the pinion shaft 27. The shifter 27c is integrated with shaft 27b, and the spindle on / off lever 27a is fixed to this shaft 27b by a tapered pin. Therefore, when the operator swings the spindle on / off lever 27a to the upper right in the diagram, gears G18 and G17 on the pinion shaft 27 mesh. As a result, gear G16 synchronizes with the pinion shaft 27, and the power input to the geared second counter shaft 26 is shifted by gears G15 and G16, and then its transmission direction is changed by 90° by gears G19 and G20 before being input to the spindle drive shaft 28.

[0098] The power input to the spindle drive shaft 28 is shifted by gears G21 and G23 before being input to the spindle 42. The spindle 42 then rotates the casing rod (not shown).

[0099] On the other hand, when the operator swings the spindle on / off lever 27a to the upper left in the diagram, gears G18 and G17 of the pinion shaft 27 become disengaged (not meshed). As a result, gear G16 becomes free to rotate relative to the pinion shaft 27, and the power input to the geared second counter shaft 26 is no longer transmitted to the pinion shaft 27. In other words, the disengagement of gears G17 and G18 disconnects the power transmission to the spindle 42.

[0100] In this embodiment, for the operator to be able to operate the spindle on / off lever 27a, it is necessary that the anchor guy wires 60 are properly installed in two or more locations. The control unit 72 determines that the anchor guy wires 60 are properly installed based on the fact that the tensile force F3 of the anchor guy wires 60 is within a predetermined normal range. The tensile force F3 of the anchor guy wires 60 is calculated by the control unit 72 based on the hydraulic signal (pressure signal) output from the pressure sensor 92 of the anchor installation detection device 80 installed between the boring device 100 and the anchor guy wires 60.

[0101] Figure 9 is an explanatory diagram showing the state in which the spindle on / off lever 27a cannot be manually operated by the rotation limiting device 110. The cylinder rod 111a will be in its maximum extended state if (1) the anchor guy wires 60 are not properly installed in two or more places at startup, or (2) the tensile force of at least one anchor guy wire 60 deviates from a predetermined normal range during operation.

[0102] As the cylinder rod 111a of the hydraulic cylinder 111 extends, the engaging portion 114 provided at the tip of the cylinder rod 111a moves the connecting shaft 116 to the right in the diagram. As a result, the connecting plate 115 swings to the right in the diagram with the shaft 27b as the pivot point. Consequently, the spindle on / off lever 27a swings to the left in the diagram, forcibly disconnecting the power transmission to the spindle 42.

[0103] Furthermore, as explained in Figure 7, when the electric motor 112a rotates forward, the cylinder rod 111a extends. As a result, the operator is unable to swing the spindle on / off lever 27a to the upper right in the figure, that is, to release the power transmission disconnection to the spindle 42. Consequently, the power transmission disconnection to the spindle 42 remains. This corresponds to the case in Figure 8 where the gear G18 of the pinion shaft 27 is not meshed with the gear G17.

[0104] Figure 10 is an explanatory diagram showing the manually operable state of the spindle on / off lever 27a. If the power transmission to the spindle 42 remains disconnected, and anchor guy wires 60 are properly installed in two or more locations, the cylinder rod 111a will be retracted to its maximum extent when the operator presses the spindle rotation limit release button 123 (Figure 3) on the anchor installation status monitoring panel 120 (Figure 3).

[0105] As the cylinder rod 111a of the hydraulic cylinder 111 retracts, the engaging portion 114 provided at the tip of the cylinder rod 111a moves to the left in the diagram. This creates a gap (shaded area) on the left side of the connecting shaft 116 that can move. As a result, the spindle on / off lever 27a becomes able to swing to the right in the diagram.

[0106] Figure 11 is an explanatory diagram showing the state in which power transmission to the spindle 42 is permitted by the spindle on / off lever 27a. When the operator swings the spindle on / off lever 27a to the upper right in the diagram, the shifter 27c moves to the upper right in the diagram in Figure 8, causing the gear G18 on the pinion shaft 27 to mesh with the gear G17. As a result, the gear G16 synchronizes with the pinion shaft 27, and power transmission to the spindle 42 is enabled.

[0107] As described above, according to the boring apparatus 100 of the present invention, if (1) anchor guy wires 60 are not properly installed at two or more locations at startup, or (2) the tensile force of at least one anchor guy wire 60 deviates from a predetermined normal range during operation, the power transmission to the spindle 42 is automatically cut off by the rotation limiting device 110.

[0108] Furthermore, if the power transmission to the spindle 42 remains disconnected and anchor guy wires 60 are properly installed in two or more locations, the operator can manually operate the spindle on / off lever 27a by pressing the spindle rotation limit release button 123 (Figure 3) on the anchor installation status monitoring panel 120 (Figure 3). This ensures that accidental rotation of the boring device due to forgetting to install anchors at startup or improper anchor installation during operation is prevented.

[0109] Although one embodiment of the present invention has been described above with reference to the drawings, the embodiments of the present invention are not limited to those described above. That is, various modifications and improvements can be made within the technical scope of the present invention. For example, the extension / retraction switching unit 117 that switches the rotation direction (forward / reverse) of the electric motor 112a of the rotation limiting device 110 may use a relay contact or a semiconductor switching element.

[0110] The rotation limiting device 110 may be configured to engage with the clutch lever 16a. Furthermore, a liquid crystal display screen may be used for indicator lights such as the normal / abnormal indicator lamp 121. Additionally, a liquid crystal touch panel may be used for buttons such as the spindle rotation limit release button 123.

[0111] The pressure sensor 92 of the anchor installation detection device 80 may be an external type. Also, a wire rope may be used for the anchor guy wire 60. [Explanation of symbols]

[0112] 10 Rotation Motor 10b AC power supply 10C Inverter 10d Motor Circuit Breaker 10e Inverter Inlet Circuit Breaker 10f Inverter Outlet Circuit Breaker 11 V-belt 12-1 First Input Axis 12-2 Second Input Axis 13 Pressure Plate 14 Clutch plates 15 Clutch cover 16 Clutch Boss 16a Clutch lever 20 Power transmission mechanism (power transmission device) 21 Geared shaft 21a Gear change lever 22. First spline axis 23. Second spline axis 24 Geared first counter shaft 25 Geared counterspline shaft 25a High / Low Speed ​​Switching Lever 26 Geared second counter shaft 27 Pinion shaft 27a Spindle on / off lever 27b shaft 27c shifter 27d Rotary Encoder 28 Spindle drive shaft 30 Feed cylinder (feeding device) 31 cylinders 32 rods 40 Swivel head (rotary drive device) 41 Final gear shift section 42 Spindle (rotary drive device) 50 base 51 Upper Base 52 Lower base 53. Slide Hanger 54 Feed support frame 50' Outrigger 60 Anchor branch lines 70 Anchor Control Unit (Control Unit) 72 Control Units 80 Anchor installation detection device (tensile force detection means) 81 First Body 81a Stepped through hole 81c Female thread section 82 Second Body 83 Stopper 83b Through hole 84 Hydraulic Cylinder 84a Cylinder 84b Cylinder rod 84c piston 85 Body fixing bolts 85a Washer 86 Body fixing nuts 87 Nut 88. First shackle 89. Second shackle 90 Oil Ports 91 T-type joint 92 Pressure sensor (pressure detection joint) 93 Hydraulic supply port 94 Cover 95 Cover fixing plate 110 Rotation limiting device 111 Hydraulic Cylinder 111a Cylinder Rod 111b Left oil chamber 111c Right oil chamber 112 Hydraulic cylinder drive unit 112a Electric motor 112b Hydraulic pump 112c Switching valve 112d Right pilot check valve 112e Left pilot check valve 112f Right flow control valve 112g Left flow control valve 112h Right No. 1 Relief Valve 112i Left No. 1 Relief Valve 112j oil tank 112k Right No. 2 Relief Valve 112L Left No. 2 Relief Valve 113 Bracket 113a Mounting plate 113b Hinge support 113c Support part 113d cover 114 Engagement part 115 Connecting shaft 116 Connecting plate 117 Telescopic switching section 118 Power supply unit for rotation limiting device 120 Anchor Installation Status Monitoring Panel 121 Normal / Abnormal Indicator Lamp 122 Monitoring device operating lamp 123 Spindle rotation limit release button

Claims

1. A power generating device (10) that generates rotational power, A rotary drive device (40) that rotates the casing rod for drilling into the ground, A feeding device (30) for feeding the casing rod in a predetermined direction, A power transmission device (20) transmits the power generated by the power generating device (10) to the rotary drive device (40), The base (50) to which the power generator (10), the power transmission device (20), the feed device (30), and the rotary drive device (40) are attached, Multiple anchor wires (60) that prevent the rotation of the base (50), A tensile force detection device (80) for detecting the tensile force of the anchor guy wire (60), A rotation limiting device (110) that disconnects power transmission to the aforementioned rotary drive device (40), The system includes a control unit (70) that determines whether or not to release the power transmission disconnection state to the rotation drive unit (40) by the rotation limiting device (110) in conjunction with the detection result of the tensile force detection device (80), In at least one of the tensile force detection devices (80), if the tensile force of the anchor guy wire (60) deviates from a predetermined normal range, the control unit (70) is configured to stop the power supply to the power generator (10) and disconnect the power transmission to the rotary drive device (40). A boring apparatus characterized by the following features.

2. In the boring apparatus according to claim 1, The tensile force detection device (80) includes a hydraulic cylinder (84) through which the axial central portion passes, The hydraulic cylinder (84) is sandwiched along the axial center and locked to the anchor wire (60) or the base (50) by a first body (81) and a second body (82), It has fasteners (85, 86) that penetrate the axial central portion and fasten the first body (81) and the second body (82) together. A boring apparatus characterized by the following features.

3. In the boring apparatus according to claim 2, The hydraulic cylinder (84) of the tensile force detection device (80) has a pressure detection joint (92) that incorporates a pressure sensor. A boring apparatus characterized by the following features.

4. In a boring apparatus according to any one of claims 1 to 3, The device includes an indicator (121) for indicating whether the tensile force of the anchor guy wire (60) is normal or abnormal, or a rotation limit release button (123) for releasing the power transmission disconnection state to the rotation drive device (40). A boring apparatus characterized by the following features.

5. In the boring apparatus according to claim 4, When the rotation limit release button (123) is pressed, the control unit (70) is configured to release the power transmission disconnection state to the rotation drive unit (40) by the rotation limiting device (110) only if the tensile force of the anchor guy wire (60) is within a predetermined normal range at a predetermined location or higher. A boring apparatus characterized by the following features.

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