Boring device

Abstract

To realize a boring device allowing extension of boring rods with a simple structure.SOLUTION: A boring device comprises: a drill unit (16); and a rod holder (20) holding additional boring rods (31, 32, 33). The rod holder (20) is movably provided in a front-back direction orthogonal to a rotational axis (16c) of the drill unit (16). The rod holder (20) moves forward to a supply position below the drill unit (16) so that the additional boring rod (31) is positioned on the rotational axis (16c), and after the drill unit (16) is lowered and the drill unit (16) is connected to the additional boring rod (31), the rod holder moves backward from the supply position. The rod holder (20) comprises a holding member (23) allowing the additional boring rod (31) to be removed from the rod holder (20) as the rod holder (20) moves backward.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a boring machine. [Background technology]

[0002] Conventionally, in boring equipment for boring holes in the ground, it is common for an operator to manually add boring rods to bore holes. Also, in a boring device for boring holes in the ground, a structure is known that includes a drill unit (drill head) to which a boring rod is detachably attached, a rod holder (rod changer) that holds a boring rod for addition, and a slide mechanism that slides the drill unit laterally toward the rod holder (see, for example, Patent Document 1). In Patent Document 1, when adding a boring rod, the drill unit is disconnected from the boring rod in the ground, and then the drill unit is moved to the rod holder to attach the next boring rod to the drill unit, and then the drill unit is returned to its original position to connect the next boring rod to the boring rod in the ground. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-78137 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional boring machine, when the boring rod is added, the drill unit itself that drives the boring rod moves vertically and horizontally, which makes the structure of the drill unit complicated. In addition, the labor shortage is becoming more evident every year due to the aging of operators and the lack of young workers. For this reason, it is desirable to realize a boring machine that can add a boring rod with a simple structure.

[0005] In view of the above, an object of the present invention is to provide a boring device that allows the boring rod to be added with a simple structure. [Means for solving the problem]

[0006] The present invention is a boring device comprising a drill unit to which a boring rod for drilling holes in the ground is detachably attached, a frame that supports the drill unit so that the drill unit can slide in the axial direction of the boring rod, and a rod holder that holds an additional boring rod for extension, wherein the rod holder holds the additional boring rod parallel to the boring rod attached to the drill unit and is movable in a forward and backward direction perpendicular to the rotation axis of the drill unit, the rod holder advances to a supply position below the drill unit where the additional boring rod is positioned on the rotation axis, and after the drill unit is lowered and connected to the additional boring rod, it retreats from the supply position, and the rod holder is equipped with a holding member that allows the additional boring rod to be pulled out of the rod holder as the rod holder retreats. Effect of the Invention

[0007] According to the present invention, a boring device capable of adding boring rods can be realized with a simple structure. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side view showing a boring machine according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a plan view of an additional boring rod held in a rod holder, viewed from above. [Diagram 3] FIG. 2 is a cross-sectional view taken along line III-III of FIG. [Figure 4] This shows the state after the first boring rod has been used. [Diagram 5]FIG. 13 is a diagram showing the process of separating the boring rod. [Figure 6] FIG. 13 shows a diagram illustrating the supply of additional boring rods by the rod holder. [Figure 7] FIG. 13 is a diagram showing the process of adding an additional boring rod. [Figure 8] FIG. 13 shows the additional boring rod being pulled out of the rod holder. [Figure 9] FIG. 13 shows the state of drilling a hole using an additional boring rod. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of a boring device according to the present invention will be described with reference to the accompanying drawings.

[0010] FIG. 1 is a side view showing a boring machine 10 according to an embodiment of the present invention. The boring device 10 includes a boring machine 12 that drills holes in the ground G using a boring rod 11, and a rod holder 20 that holds additional boring rods 31, 32, and 33 for extension.

[0011] The boring machine 12 comprises a base 14 placed on the ground G, a frame 15 erected from the base 14, a drill unit 16 to which a boring rod 11 for drilling holes in the ground is detachably attached, a reinforcing member 17 extending diagonally downward from the frame 15 and connected to the base 14, and a rod clamp 18 supported by the base 14.

[0012] The frame 15 is a column extending in the vertical direction (up and down direction). The frame 15 supports the drill unit 16 so that the drill unit 16 can slide up and down. The drill unit 16 slides up and down by the power of a movement motor (not shown) provided in the boring machine 12.

[0013] The drill unit 16 includes a main body 16a slidably supported by the frame 15, and a rotating part 16b protruding downward from the bottom surface of the main body 16a. The rotating part 16b rotates about a rotation axis 16c extending in the vertical direction. The main body 16a includes a motor (not shown) that rotates the rotating part 16b.

[0014] The boring rod 11 has an upper end attached to the rotating part 16b and extends downward from the rotating part 16b. The boring rod 11 is attached so that the axis of the boring rod 11 coincides with the rotation axis 16c, and rotates around the rotation axis 16c. The axial direction of the boring rod 11 is the up-down direction, and the frame 15 supports the drill unit 16 so as to be slidable in the axial direction of the boring rod 11. A bit 11a serving as a cutting portion is attached to the lower end of the boring rod 11.

[0015] The rod holder 20 is installed adjacent to the boring device 10. The rod holder 20 includes a slide base 21 installed on the ground G, a slider 22 that is slidable on the slide base 21, a holding member 23 that holds the additional boring rods 31, 32, and 33, and a push-out member 24 that pushes the additional boring rods 31, 32, and 33.

[0016] The slider 22 is columnar and stands upright from the slide base 21. The slider 22 is slidable in a front-rear direction D perpendicular to the rotation axis 16c. In the front-rear direction D, the rotation axis 16c is located in front of the slider 22. The slide base 21 has a rail portion 21a extending in the front-rear direction on the upper surface thereof. The rail portion 21a is a rail-shaped groove extending in the front-rear direction. A lower end 22a of the slider 22 is connected to the rail portion 21a. The slider 22 is capable of sliding in the front-rear direction D by the lower end 22a moving along the rail portion 21a.

[0017] The wall at the front end of the groove of the rail portion 21a is a stopper portion 21b that restricts the forward movement of the slider 22. The slider 22 can advance up to a position where the lower end portion 22a abuts against the stopper portion 21b. In FIG. 1, the lower end portion 22a of the slider 22 is located at the rear end of the rail portion 21a. The slider 22 slides in the front-rear direction D by the power of a driving source (not shown) such as a motor provided in the rod holder 20.

[0018] FIG. 2 is a plan view of the additional boring rods 31, 32, and 33 held in the rod holder 20 as viewed from above. 1 and 2, a plurality of additional boring rods 31, 32, and 33 are provided. The holding member 23 holds the three additional boring rods 31, 32, and 33 in a row in the front-rear direction D. The additional boring rods 31, 32, and 33 are the same members but are given different reference numerals for distinction.

[0019] In detail, the additional boring rod 31 is the additional boring rod located at the frontmost position in the arrangement of the additional boring rods 31, 32, and 33. The additional boring rod 33 is the rearmost additional boring rod in the arrangement of the additional boring rods 31, 32, and 33. The additional boring rod 32 is an additional boring rod located between the additional boring rod 31 and the additional boring rod 33. The holding member 23 holds the additional boring rods 31, 32, and 33 in parallel with the boring rod 11 attached to the rotating portion 16b.

[0020] The holding member 23 is supported by the slider 22. A plurality of holding members 23 are provided in the vertical direction. The holding members 23 are provided at one location on the upper part of the slider 22 and at one location on the lower part of the slider 22. The holding member 23 includes a pair of side walls 25 that sandwich and hold the additional boring rods 31, 32, 33 from both sides in the width direction, a front wall 26 that holds the additional boring rod 31 on the front end side from the rotation axis 16c side, and a slit 27 provided in the front wall 26. Here, the width direction is the left-right direction when the front-rear direction D is used as the reference.

[0021] The pair of side walls 25 are plate-like portions extending forward from the slider 22 in parallel with each other. The front wall portion 26 is formed by a pair of inner extension portions 26a extending forward and inward in the width direction from the front ends of the side walls 25. The inner extension portions 26a are formed in an arc shape so as to fit along the outer periphery of the additional boring rod 31. The slit 27 is an opening formed between the tips of the pair of inner extending portions 26a, and is located at the center in the width direction of the holding member 23. The slit 27 is provided over the entire front wall portion 26 in the up-down direction. The width of the slit 27 is smaller than the outer diameter of the additional boring rods 31, 32, and 33.

[0022] The push-out member 24 includes a coil spring 24a extending forward from the front surface of the slider 22, and a plate-shaped receiving member 24b connected to the front end of the coil spring 24a. When viewed from above, the push-out member 24 is located between a pair of side walls 25. The push-out members 24 are provided above the upper holding member 23 and below the lower holding member 23, respectively. The push-out member 24 is provided in a compressed state between the additional boring rod 33 located at the rearmost position in the arrangement of the additional boring rods 31, 32, 33 and the front surface of the slider 22. The push-out member 24 biases the additional boring rods 31, 32, and 33 toward the front wall portion 26 via the receiving member 24b by the restoring force of the coil spring 24a.

[0023] Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1. Fig. 3 is a cross-sectional view of the upper holding member 23. A groove 34 is provided on the upper part of each of the additional boring rods 31, 32, 33, going around the outer circumference of each of the additional boring rods 31, 32, 33. The groove 34 is a groove extending in the front-rear direction when the additional boring rods 31, 32, 33 held by the holding member 23 are viewed from the side. The groove 34 is recessed in an arc-shaped cross section. The groove 34 is also provided on the lower part of each of the additional boring rods 31, 32, 33.

[0024] A rail-shaped guide protrusion 25a extending in the front-rear direction is provided on the inner surface of each side wall portion 25. The guide protrusion 25a is continuous from the front end portion to the rear end portion of the side wall portion 25 so as to engage with all three additional boring rods 31, 32, and 33. The holding member 23 holds the additional boring rods 31, 32, and 33 with the guide projections 25a of the left and right side wall portions 25 engaged with the grooves .

[0025] The lower holding member 23 (FIG. 1) also has a guide protrusion 25a, similar to the upper holding member 23, and this guide protrusion 25a engages with a groove 34 provided in the lower part of the additional boring rods 31, 32, and 33.

[0026] 1, the rod clamp 18 of the boring machine 12 is stored in a storage section of the base 14. The rod clamp 18 is provided so as to be slidable in the front-rear direction by the drive of an actuator (not shown).

[0027] The boring machine 10 can be remotely operated by an operating device provided at a location remote from the boring machine 10. The bowling machine 10 includes a camera, a control unit, a wireless communication unit, etc. The control unit is composed of a CPU (Central Processing Unit), an input / output interface, a ROM, a RAM, etc., and stores a program for processing information. The camera, the wireless communication unit, etc. are connected to the control unit. An operation signal from the operating device is sent to the control unit via the wireless communication unit, and the control unit controls the up and down sliding movement of the drill unit 16, the rotation of the rotating unit 16b, the back and forth sliding movement of the rod clamp 18, and the back and forth sliding movement of the slider 22 based on the operation signal. The images captured by the camera are processed by the control unit and displayed on a display unit provided on the operation device. This allows an operator who remotely controls the boring machine 10 using the operation device to operate the boring machine 10 while checking the status of the boring machine 10 on the display unit.

[0028] Here, an example of the procedure for drilling a hole using the boring device 10 will be described. As shown in Fig. 1, a worker installs a boring device 10 on the ground G at the site. The worker attaches a first boring rod 11 having a bit 11a attached thereto to a rotating part 16b of a boring machine 12 at the site. The boring rod 11 is a cylindrical pipe. The boring rod 11 is connected to the rotating part 16b by screwing a male threaded portion of the rotating part 16b into a female threaded portion formed on the inner circumference of the upper end part of the boring rod 11. Further, the additional boring rods 31, 32, and 33 are the same members as the boring rod 11, but are described by different names for the purpose of distinction in the description.

[0029] FIG. 4 shows the state after the first boring with the boring rod 11. The operator operates the operating device to rotate the rotating part 16b in the forward direction and move the drill unit 16 downward, and as shown in Fig. 4, the boring rod 11 bores a hole in the ground G. As a result, a hole G1 is formed in the ground G. The operations described below are similarly performed by remote control.

[0030] FIG. 5 is a diagram showing the process of separating the boring rod 11. When the boring of the first boring rod 11 is completed, the rod upper end 11b, which is the upper end of the boring rod 11 in the ground G, protrudes upward from the ground G. The operator slides the rod clamp 18 backward so that it projects from the base 14 and abuts the rod upper end 11b. In this state, the rotation of the boring rod 11 is restricted by the rod clamp 18. In detail, the rod clamp 18 has a holding groove formed by cutting out a substantially V-shape from the rear side of the rod clamp 18 in a top view. The rod clamp 18 presses this holding groove against the outer periphery of the rod upper end portion 11b, thereby restricting the rotation of the boring rod 11 by frictional force.

[0031] The operator rotates the rotating part 16b in the reverse direction while the rotation of the boring rod 11 is restricted by the rod clamp 18. This releases the screw engagement between the rod upper end 11b of the boring rod 11 and the rotating part 16b, and the boring rod 11 is separated from the rotating part 16b. Here, an anti-adhesion member (not shown) is inserted in the screwed portion between the rod upper end portion 11b of the boring rod 11 and the rotating portion 16b so as to be wrapped around the screwed portion. By providing the anti-adhesion member in the screwed portion in this way, it is possible to prevent the boring rod 11 from being excessively screwed into the rotating portion 16b, and the boring rod 11 can be easily detached by reverse rotation of the rotating portion 16b. The anti-adhesion member is, for example, a paper packing or a rubber O-ring.

[0032] FIG. 6 is a diagram showing the supply of an additional boring rod 31 by the rod holder 20. After disconnecting the boring rod 11, the operator slides the drill unit 16 upward and slides the slider 22 forward as shown in FIG. The three additional boring rods 31, 32, and 33 held by the holding member 23 move forward together with the slider 22.

[0033] In detail, the slider 22 advances to a supply position where the leading additional boring rod 31 is positioned on the rotation axis 16c below the drill unit 16. When the slider 22 advances until the lower end 22a abuts against the stopper portion 21b, the slider 22 is positioned at the supply position. In contrast, when the slider 22 is located at the rear end of the rail portion 21a as shown in FIG. 1, the additional boring rod 31 is located rearwardly away from the rotation axis 16c.

[0034] FIG. 7 is a diagram showing the process of adding the additional boring rod 31. The operator slides the drill unit 16 downward and rotates the rotating part 16b in the forward direction, screwing the rotating part 16b into the female threaded part of the upper end part 31a of the additional boring rod 31. This connects the additional boring rod 31 to the rotating part 16b. The above-mentioned anti-sticking member is inserted into the screwed part between the rotating part 16b and the additional boring rod 31.

[0035] Next, the operator further lowers the drill unit 16 and the additional boring rod 31 while rotating the rotating part 16b in the forward direction. This causes the additional boring rod 31 to move downward relative to the holding member 23, and the engagement between the guide protrusion 25a and the groove 34 (FIG. 3) is released. Then, when the additional boring rod 31 further lowers, the male threaded part on the outer periphery of the lower end part 31b of the additional boring rod 31 screws into the female threaded part on the inner periphery of the rod upper end part 11b, and the additional boring rod 31 is connected to the boring rod 11. At this time, since the rotation of the boring rod 11 is restricted by the rod clamp 18, the additional boring rod 31 can be properly screwed into the boring rod 11. In this way, by lowering the drill unit 16 toward the additional boring rod 31 that has been carried onto the rotation axis 16c by the forward movement of the slider 22, the drill unit 16 can be easily connected to the additional boring rod 31. Therefore, it is not necessary to structure the drill unit 16 so that it can move in the forward / backward or left / right directions, and the boring machine 12 can be simplified in structure.

[0036] FIG. 8 is a diagram showing a state in which the additional boring rod 31 has been pulled out from the rod holder 20. As shown in FIG. After the additional boring rod 31 is connected to the boring rod 11, the operator moves the slider 22 backward as shown in FIG. 8. When the slider 22 moves backward, the holding member 23 moves backward relative to the additional boring rod 31 together with the slider 22, and the additional boring rod 31 passes through the slit 27 (FIG. 2) and is pulled outward from the holding member 23. At this time, the additional boring rod 31 is pulled out while being guided by the guide protrusion 25a via the groove 34 (FIG. 3). Also, the additional boring rod 31 is pulled out from the holding member 23 while elastically deforming the pair of side wall portions 25 so as to push the slit 27 wider in the width direction. In this way, since the additional boring rod 31 can be detached from the holding member 23 simply by retracting the slider 22, the rod holder 20 can have a simple structure. In addition, when the additional boring rod 31 is pulled out, the boring rod 11 is held by the rod clamp 18. Therefore, the swing of the additional boring rod 31 when it is pulled out can be suppressed, and the additional boring rod 31 can be easily pulled out.

[0037] When the additional boring rod 31 is pulled out from the holding member 23, the additional boring rods 32, 33 are pushed forward by the pushing member 24. As a result, the additional boring rod 32 abuts against the front wall portion 26, becoming the additional boring rod located most forward.

[0038] FIG. 9 is a diagram showing a state in which a hole is drilled using an additional boring rod 31 that has been added. The operator slides the rod clamp 18 forward and stores it in the base 14, and releases the restriction on the rotation of the boring rod 11. After that, the operator rotates the rotating part 16b in the forward direction and moves the drill unit 16 downward to drill the hole G1 even deeper.

[0039] When the drilling of the hole G1 progresses and the additional boring rod 32 is to be added, the operator rotates the rotating part 16b in the reverse direction to separate the additional boring rod 31 from the rotating part 16b and raises the drill unit 16. Next, the operator advances the slider 22 to the supply position to position the additional boring rod 32 below the rotating part 16b on the rotation axis 16c. After that, the operator lowers the drill unit 16 and connects the rotating part 16b to the upper end of the additional boring rod 32. At this time, since the additional boring rod 32 is pushed out by the pushing member 24 so as to be positioned at the frontmost position within the holding member 23, the additional boring rod 32 can be positioned on the rotation axis 16c simply by moving the slider 22 forward to the supply position. Therefore, there is no need for a complex structure that allows the front-rear position of the slider 22 to be infinitely adjustable, and the rod holder 20 can be made of a simple structure.

[0040] In addition, after the additional boring rod 32 is joined to the additional boring rod 31, when the additional boring rod 32 is pulled out from the holding member 23, the additional boring rod 33 is pushed forward by the pushing member 24. As a result, the additional boring rod 33 abuts against the front wall portion 26, and becomes the additional boring rod located most forward.

[0041] As described above, according to the embodiment of the present invention, the boring device 10 includes the drill unit 16 to which the boring rod 11 for drilling holes in the ground is detachably attached, the frame 15 that supports the drill unit 16 so as to be slidable in the axial direction of the boring rod 11, and the rod holder 20 that holds the additional boring rods 31, 32, 33 for extension. The rod holder 20 holds the additional boring rods 31, 32, 33 in parallel with the boring rod 11 attached to the drill unit 16, and is provided so as to be movable in the front-rear direction D perpendicular to the rotation axis 16c of the drill unit 16. The rod holder 20 advances to a supply position below the drill unit 16 where the additional boring rod 31 is positioned on the rotation axis 16c, and after the drill unit 16 descends and is connected to the additional boring rod 31, it retreats from the supply position. The rod holder 20 includes a holding member 23 that pulls out the additional boring rod 31 from the rod holder 20 as the rod holder 20 retreats. According to this configuration, when the rod holder 20 advances to the supply position, the additional boring rod 31 is positioned below the drill unit 16 and on the rotation axis 16c of the drill unit 16, so that the drill unit 16 can be connected to the additional boring rod 31 by lowering the drill unit 16. Also, the additional boring rod 31 connected to the drill unit 16 is pulled out from the holding member 23 of the rod holder 20 by the rod holder 20 retreating from the supply position, so that the additional boring rod 31 can be easily detached from the rod holder 20. In this way, the additional boring rod 31 can be connected and detached by the lowering of the drill unit 16 and the advancement and retreat of the rod holder 20, so that the boring device 10 capable of adding the additional boring rod 31 can be realized with a simple structure.

[0042] The rod holder 20 also includes a slider 22 that is movable in the front-rear direction, and when the slider 22 advances to a supply position, the holding member 23 is supported by the slider 22 and holds the additional boring rods 31, 32, and 33. The holding member 23 includes a side wall portion 25 that holds the additional boring rods 31, 32, and 33 by sandwiching them from both sides, a front wall portion 26 that holds the additional boring rods 31, 32, and 33 from the rotation axis 16c side, and a slit 27 provided in the front wall portion 26, and when the slider 22 retreats, the additional boring rod 31 is pulled out from the slit 27. According to this configuration, the additional boring rods 31, 32, 33 can be held with a simple structure by the side wall portion 25 and the front wall portion 26. In addition, when the slider 22 retracts, the additional boring rod 31 is pulled out from the slit 27 of the front wall portion 26 of the holding member 23, so that the additional boring rod 31 can be detached from the rod holder 20 with a simple structure.

[0043] The holding member 23 holds a plurality of additional boring rods 31, 32, 33 arranged in the front-rear direction, and when the slider 22 is in the supply position, the additional boring rod 31 located at the frontmost position in the arrangement of the additional boring rods 31, 32, 33 is located on the rotation axis 16c. The rod holder 20 includes a push-out member 24 that moves the additional boring rods 31, 32, 33 forward within the holding member 23. According to this configuration, when the frontmost additional boring rod 31 is pulled out, the rear additional boring rod 32 is pushed by the push-out member 24 to be positioned frontmost. Therefore, when a plurality of additional boring rods 31, 32, 33 are held, it is not necessary to adjust the front and rear positions of the slider 22 in accordance with each of the additional boring rods 31, 32, 33 in order to position each of the additional boring rods 31, 32, 33 at the position of the rotation axis 16c. Therefore, the slider 22 can have a simple structure.

[0044] Furthermore, the pushing member 24 is provided with a coil spring 24a that biases the additional boring rods 31, 32, and 33 forward. According to this configuration, the additional boring rods 31, 32, and 33 can be positioned at the most forward position with a simple structure that utilizes the coil spring 24a that biases the additional boring rods 31, 32, and 33 forward.

[0045] Furthermore, the rod holder 20 is provided with a stopper portion 21b that restricts the forward movement of the slider 22. When the slider 22 advances and hits the stopper portion 21b, the slider 22 is positioned at the supply position. According to this configuration, when slider 22 advances and hits stopper portion 21b, slider 22 is located at the supply position, so that slider 22 can be located at the supply position with a simple structure.

[0046] Further, a groove 34 extending in the front-rear direction D is provided on the outer periphery of each of the additional boring rods 31, 32, 33, and a rail-shaped guide protrusion 25a extending in the front-rear direction D and engaging with the groove 34 is provided on the inner surface of the side wall portion 25. According to this configuration, the additional boring rods 31, 32, and 33 can be effectively held in the vertical direction with a simple structure in which the guide protrusions 25a are engaged with the grooves 34 of the additional boring rods 31, 32, and 33. Also, when the additional boring rod 31 is pulled out by the retraction of the slider 22, the additional boring rod 31 is guided by the guide protrusions 25a extending in the front-rear direction and is smoothly pulled out.

[0047] Further, the upper end 31a of the additional boring rod 31 is connected to the drill unit 16, and the lower end 31b of the additional boring rod 31 is connected to the rod upper end 11b, which is the upper end of the boring rod 11 in the ground G. A rod clamp 18 is provided to hold the rod upper end 11b, and the additional boring rod 31 is pulled out of the holding member 23 by retracting the rod holder 20 with the rod upper end 11b held by the rod clamp 18. According to this configuration, the additional boring rod 31 is pulled out from the holding member 23 by retracting the rod holder 20 while the rod upper end portion 11b is held by the rod clamp 18, so that the vibration of the additional boring rod 31 when pulled out can be suppressed and the additional boring rod 31 can be pulled out appropriately.

[0048] Although one embodiment of the present invention has been described above, the present invention is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the spirit of the present invention described in the claims unless otherwise specifically limited in the above description. For example, the configuration of the above-mentioned embodiment can be appropriately added or deleted, and the configuration of one embodiment can be applied to another embodiment. Furthermore, the effects of the above-mentioned embodiment are merely examples of the effects resulting from the present invention, and do not mean that the effects of the present invention are limited to the above-mentioned effects. In the above embodiment, the pushing member 24 is described as having the coil spring 24a, but the present invention is not limited to this. The pushing member 24 may be, for example, a hydraulic cylinder that pushes the additional boring rod 33 forward, or a mechanism that pushes the additional boring rod 33 forward by a screw that is rotated and driven by a motor to move in the axial direction. [Explanation of symbols]

[0049] 10: Boring equipment 11: Bowling Rod 11b: Upper end of rod 15: Frame 16: Drill unit 16c: Rotation axis 18: Rod clamp 20: Rod holder 21b: Stopper part 22: Slider 23: Holding member 24: Extrusion member 24a: Coil spring (spring) 25: Side wall 25a: Guide protrusion 26: Front wall 27: Slit 31: Additional boring rod (the additional boring rod located at the front of the row of boring rods) 31a: Upper end 31b: Bottom end 32: Additional boring rod 33: Additional boring rod 34: Groove

Claims

1. The drill unit includes a drilling rod for drilling holes in the ground that is detachably attached to the drilling unit, a frame that supports the drilling unit so that the drilling unit can slide in the axial direction of the drilling rod, and a rod holder that holds an additional drilling rod for extension. The rod holder holds the additional boring rod parallel to the boring rod attached to the drill unit, and is movable in a forward and backward direction perpendicular to the rotation axis of the drill unit. the rod holder advances to a supply position below the drill unit such that the additional boring rod is positioned on the rotation axis, and the drill unit is lowered to connect the additional boring rod thereto, and then the rod holder retreats from the supply position; The rod holder is provided with a holding member by which the additional boring rod is pulled out from the rod holder when the rod holder is retracted.

2. The rod holder includes a slider that is movable in a forward and backward direction, and the slider advances to the supply position, the holding member is supported by the slider and holds the additional boring rod; The holding member includes a side wall portion that holds the additional boring rod by sandwiching it from both sides, a front wall portion that holds the additional boring rod from the rotation axis line side, and a slit provided in the front wall portion, 2. The boring device according to claim 1, wherein the additional boring rod is withdrawn from the slit when the slider retracts.

3. The holding member holds a plurality of the additional boring rods arranged in a front-rear direction, When the slider is located at the supply position, the additional boring rod located at the front end of the row of the additional boring rods is located on the rotation axis, 3. The boring apparatus according to claim 2, wherein the rod holder includes a push-out member for moving the additional boring rod forward within the holding member.

4. 4. The boring device according to claim 3, wherein the pushing member includes a spring for biasing the additional boring rod forward.

5. The rod holder includes a stopper portion that restricts the forward movement of the slider, 3. The boring device according to claim 2, wherein when the slider advances and abuts against the stopper portion, the slider is located at the supply position.

6. The additional boring rod has an outer periphery provided with a groove extending in the front-rear direction, 3. The boring device according to claim 2, wherein an inner surface of said side wall portion is provided with a rail-shaped guide projection extending in the front-rear direction and engaging with said groove.

7. The upper end of the additional boring rod is connected to the drill unit, and the lower end of the additional boring rod is connected to the upper end of the boring rod in the ground, which is the upper end of the rod; A rod clamp is provided to hold the upper end of the rod, 7. The boring device according to claim 1, wherein the additional boring rod is pulled out from the holding member by retracting the rod holder with the upper end of the rod held by the rod clamp.

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