JP2009281046A - Drilling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the efficiency of operation by increasing the length of a hole to be drilled in a restricted working space or reducing the number of joints of a rod for drilling a hole with a predetermined length. <P>SOLUTION: In this drilling device 10, a shaft-like guide cell 15 is installed on the upper surface of a frame 11, and a rock drill 16 which has a rod holding section 16a for holding a drilling rod 22 at the front and which imparts a rotating force in the right-angled direction and a hammering force in the axial direction to the drilling rod 22 is slidably installed on the guide cell 15. The body 16b of the rock drill is vertically tiltable about the rear section 16c thereof. The guide cell 15 is slid generally horizontally in the right-angled direction by sliders 18, 19 and a guide rail 14 for retreating. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a drilling device that drills a natural ground while a rotary impact type drilling rod is advanced along a guide cell, and in particular, the drilling length is longer than the length of the drilling rod or the guide cell. The present invention relates to a drilling device that is effective when a drilling rod needs to be added or replaced.

  In tunnels and the like, rock bolts may be driven to prevent the collapse of natural ground. In general, the drilling of the natural ground when driving the rock bolt into the natural ground is carried out manually using a rotary hitting rock drill or using a drill jumbo and pushing the rock drill along the guide cell. Is done. When the drilling length is longer than the length of the drilling rod, the drilling rods are sequentially added (joint only method) or replaced with a rod longer than the rod used for the immediately previous drilling ( A desired drilling length is ensured by changing only) (see, for example, Patent Document 1).

When mounting a drilling rod to a rock drill for manpower or a drill jumbo that drives the drilling rod to rotate, the end on the mounting side of the drilling rod usually has a predetermined cross section such as a hexagon. The rock drilling machine is provided with a rod insertion portion formed and corresponding to the cross section, and the end of the drilling rod is inserted into the rod insertion portion. Therefore, in order to set the drilling rod, in addition to the length of the drilling rod, a space corresponding to this mounting space is required.
JP-A-9-96196

  However, when drilling holes manually using a rock drill, the rock drill with the drill rod set was set at the desired position, and the reaction rod was installed diagonally downward from the rock drill. Since the operator drills holes while holding the rock drill, the space for securing the reaction force is required in addition to the space corresponding to the mounting position. Therefore, if the tunnel cross-section is small and the space for installing the rock drilling machine is limited, or if equipment is already installed in the tunnel and the required working space for the drilling length cannot be secured, cutting at once. The length that can be perforated is shortened. For example, as shown in FIG. 8, the length 11 that can be drilled at a time is not the value obtained by subtracting the length m of the rock drill and the length a of the mounting margin from the tunnel width w, but the length of the rock drill. This is a value obtained by subtracting the length m and the reaction force space length b larger than a. Therefore, as the drilling hole length increases, the number of drilling rods to be joined or replaced increases, and the labor and time required for work increase.

  On the other hand, when the drill jumbo is used, as shown in FIG. 9, even if the guide cell 15 is made as long as possible and the rock drill 16 can be retracted until it comes into contact with the inner wall of the tunnel, the joint only method is used once. The length l2 that can be drilled is subtracted from the tunnel width w, the length m of the rock drill, and the length a ′, which is the larger of the mounting length a or the rod joint length c. Value. In addition, even with the replacement only method, the length of the replacement rod that can be inserted into the drilled hole without moving the drill jumbo 41 is determined from the tunnel width w to the length m of the rock drill 16 and the length a of the mounting margin. The subtracted length l2 is obtained, and the length that can be drilled is shortened by the length a of the mounting margin. If the drill jumbo 41 is retracted, a rod having a length obtained by subtracting the length m of the rock drill 16 from the tunnel width w can be inserted and set. However, once the drill jumbo 41 is moved, It is difficult to insert the drilling rod set in the already drilled hole into the insertion hole of the rock drill 16, which again increases time and labor.

  The present invention has been made in view of such a background, by increasing the drilling length in a limited work space or by reducing the number of joints of rods for drilling a predetermined length. An object of the present invention is to provide a drilling device capable of improving work efficiency.

  In order to solve the above problems, the present invention provides a gantry, a shaft-shaped guide cell provided on the gantry, and a holding portion that is slidably provided on the guide cell and holds a drilling rod. And a rock drilling machine that applies a rotational force in the direction perpendicular to the axis and a striking force in the axial direction to the drilling rod, and the guide cell is slidable in a direction substantially perpendicular to the axial direction. The drilling device is configured as described above.

  In order to solve the above-described problems, the present invention includes a gantry, a shaft-shaped guide cell provided on the gantry, and a holding portion that is slidably provided on the guide cell and holds a drilling rod. A rock drilling machine having a front part and giving a rotational force in the direction perpendicular to the axis and a striking force in the axial direction to the drilling rod, and the rock drilling machine is provided so as to be tiltable around the rear part. The drilling device is configured as described above.

  In the hole drilling device, the gantry is extendable substantially parallel to the axial direction of the guide cell and protrudes in a direction opposite to the drilling direction, and substantially parallel to the axial direction of the guide cell. In this case, at least one of the first gantry fixing means and the second gantry fixing means is extended by driving an air cylinder. It may be configured as follows. Moreover, it is good to comprise so that the said base may be equipped with the raising / lowering mechanism which expands-contracts up and down, or the said guide cell is provided so that tilting is possible.

  According to the invention, the guide cell is provided so as to be slidable in a direction substantially orthogonal to the axial direction thereof, or the rock drill is provided so as to be tiltable about the rear portion thereof, so that the joint rod or the replacement rod is set. In doing so, the rock drill can be retreated without moving the gantry, and the length of the connecting rod or the replacement rod can be increased. And since it is not necessary to move a mount frame, these splicing work or replacement work can be performed easily and in a short time.

  Further, the gantry includes first gantry fixing means that projects in a direction opposite to the drilling direction and second gantry fixing means that projects in the drilling direction, so that the gantry can be moved in the front-rear direction with respect to the drilling direction. Since it is in a fixed state and the reaction force during drilling can be taken from the first platform fixing means, even if a heavy load is applied to the rock drill, the platform will move in a direction opposite to the drilling direction. Can be prevented. Furthermore, if at least one of the first gantry fixing means and the second gantry fixing means is configured to extend by driving the air cylinder, the gantry fixing is loosened due to vibration during drilling using the compressibility of air. Can be prevented.

  Further, since the gantry includes the lifting mechanism, it is possible to drill holes at different height positions without moving the gantry. In addition, when drilling holes in the upper part of the lifting range, the base can be shrunk without tilting the rock drill or sliding the guide cell horizontally when setting the joint rod or replacement rod. The above effects can also be achieved.

  By providing the guide cell in a tiltable manner, it is possible to drill holes in various directions. And, since the gantry is equipped with wheels for movement and movement prevention means, not only the gantry can be moved easily, but also the gantry is prevented from moving during drilling, and it is possible to drill holes at accurate positions At the same time, the connecting rod or the replacement rod can be easily set.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, when describing the direction of the tunnel 1, the direction from the tunnel entrance 1a to the tunnel exit (or face) is referred to as the tunnel front, and the left and right in the tunnel front view are referred to as the tunnel left side and the tunnel right side, respectively. When the direction is described with respect to 10, the direction toward the drilling direction is referred to as the front side of the apparatus, and the left and right sides in the drilling direction view (the tunnel longitudinal direction) are referred to as the apparatus left side and the apparatus right side, respectively.

  FIG. 1 is a longitudinal sectional view of a tunnel 1 that performs rock bolt construction using a drilling device 10 of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 and a side view of the drilling device 10. It is. As shown in the figure, the tunnel 1 is a so-called minimal cross-section tunnel having a tunnel width w = 1500 mm that is constructed by a conventional construction method and used as an industrial waterway. Although the tunnel 1 has an arch-shaped wall surface formed by a support work and rolled concrete, cracks are generated due to a change in external pressure acting on the rolled concrete, so that the drilling device 10 according to the present invention is used. The tunnel 1 is reinforced by the applied lock bolt.

  The hole drilling device 10 is carried into the tunnel 1 and is placed at an appropriate position, and lock bolts are sequentially driven from the tunnel entrance 1a side. As equipment for driving the rock bolts, a compressor 3 that is arranged near the wellhead and pumps compressed air serving as a driving source to the drilling device 10 via the air hose 2 and compressed air formed by the air hose 2. The operation table 4 disposed near the hole drilling device 10 in the path and operating the hole drilling device 10 and dust discharged from the hole drilling device 10 at the time of drilling using compressed air from the compressor 3 are used. A dust collector 5 is used as an incidental facility that collects the obtained negative pressure.

  Thus, since the drilling device 10 uses only compressed air as a drive source for the entire system including the accompanying facilities, the facilities to be installed in the tunnel 1 are only light equipment such as lighting equipment and ventilation equipment. The installation of power equipment and water supply equipment can be omitted.

  FIG. 3 is a plan view of the hole drilling device 10. As shown in FIGS. 2 and 3, the drilling device 10 is attached to the gantry 11 and the upper rear of the gantry 11 (the right side of the tunnel in the figure) in parallel with each other, and expands and contracts in the longitudinal direction of the device (the tunnel left and right direction). Two rear frame fixing devices 12 (first fixing means) that can be freely and protrude rearward, and are attached in parallel to each other in front of the upper portion of the frame 11 (on the left side of the tunnel in the figure), and are extendable in the longitudinal direction of the device And two front gantry fixing devices 13 (second fixing means) projecting forward of the gantry, and two parallelly arranged on the upper surface of the gantry 11 so as to extend in the left-right direction (tunnel front-rear direction) of the device The main component includes a retraction guide rail 14, a linear guide cell 15 slidably provided on the retraction guide rail 14, and a rock drill 16 provided slidably on the guide cell 15. The That.

  The gantry 11 includes four wheels 17 as moving means and a stopper (not shown) provided on the wheels 17 as movement preventing means, thereby enabling movement in the tunnel 1 in all directions. ing. Further, the gantry 11 has an elevating mechanism 11a (see FIG. 5), whereby the gantry upper part 11b can be moved up and down.

  The rear pedestal fixing device 12 includes air cylinders 12a that extend and contract using compressed air as a drive source. On the other hand, the front pedestal fixing device 13 includes manual length adjusting portions 13a that can be expanded and contracted stepwise and continuously by pins and screw portions. When fixing the gantry 11 with these gantry fixing devices 12 and 13, first, the front gantry fixing device 13 is extended and fixed in the state of being in contact with the wall surface of the tunnel 1. The air cylinder 12 a is operated to bring the rear frame fixing device 12 into contact with the opposite side wall surface of the tunnel 1. By fixing the gantry 11 to the left and right wall surfaces of the tunnel 1 in this way, the drilling device 10 is prevented from moving even during drilling. In addition, when an air cylinder is provided in either one of the rear gantry fixing device 12 and the front gantry fixing device 13, by providing the air cylinder on the rear gantry fixing device 12 side, the drilling position can be accurately aligned. It can be carried out.

  The retraction guide rail 14 is supported by a steel material so that a steel pipe 14a formed in a groove shape by removing an upper circular arc portion that is less than or equal to a semicircle, and is fitted in each groove-shaped steel pipe 14a. The pipe-shaped sliders 18 are slidable in the left-right direction of the apparatus and are held upward so as not to fall off. Angle change members 20 and 21 are respectively joined to the upper end of the slider 18, and the guide cell 15 is bolted to the upper ends of the angle change members 20 and 21 so that the guide cell 15 and the slider 18 move in the left-right direction of the apparatus. The guide cells 15 are tilted by using the angle changing members 20 and 21 having different heights in the front and rear of the two retracting guide rails 14 and the axial direction of the guide cells 15 (see FIG. 3). Can be changed.

  The guide cell 15 is formed in a T shape at the top of the cross section, and guides the rock drill 16 that engages with the T portion in the longitudinal direction of the apparatus. The guide cell 15 and the rock drill 16 are connected by a feed cylinder 23 (see FIG. 5), and the feed cylinder 23 is expanded or contracted by operating the direction of the compressed air supplied by the operation table 4. The rock drill 16 can be slid along the guide cell 15.

  Thus, the guide cell 15 extends substantially horizontally and moves the rock drill 16 horizontally when the gantry 11 is in a contracted state and the angle changing members 20 and 21 having the same height are attached. As shown in FIG. 4, the platform 11 is extended to move upward while maintaining the horizontal state. Similarly, the rock drill 16 is moved horizontally, and the angle changing members 20 and 21 having different heights are moved. By using it, the rock drill 16 can be tilted upward or downward with the horizontal direction of the apparatus as an axis, and the rock drill 16 can be moved diagonally upward or diagonally downward.

  The rock drill 16 has a rod holding portion 16a for holding the drilling rod 22 with one end of the drilling rod 22 inserted into the front end thereof, and the supplied compressed air is used as a drive source via the rod holding portion 16a. Thus, a rotational force in the direction perpendicular to the axis and a striking force in the axial direction are applied to the drilling rod 22 to drill the wall or arch portion of the tunnel 1. The rock drill 16 includes a rock drill main body 16b including a rod holding portion 16a, and a slider portion 16d that pivotally supports a rear portion 16c of the rock drill main body 16b and is in sliding contact with the guide cell 15. The main body 16b can tilt up and down around the rear portion 16c.

  A rod guide 15a is provided at the front end of the guide cell 15 to keep the rotation position of the bit 22a provided at the tip of the drilling rod 22 constant by holding the drilling rod 22 rotatably. Further, in front of the dust collecting pad 24, a suction hose 28 connected to the dust collecting device 5 is connected to the dust collecting device 5 by being pressed against the wall surface of the tunnel 1 in order to collect dust generated by drilling by the rock drill 16. Is arranged so as to be movable in the front-rear direction of the apparatus by driving the air cylinder 25.

  FIG. 5 is a piping diagram of the hole drilling device 10. As shown in the figure, an operating table 4 is provided in a compressed air path formed by an air hose 2 connected to the compressor 3 via an intake manifold 6 provided with a gate valve 30. The compressed air path branches into each member installed in the hole drilling device 10 and the dust collecting device 5 in the operation table 4. The hole drilling device 10 is equipped with a feed cylinder 23, a dust collecting pad 24, a rock drill 16, an air cylinder 25 for the dust collecting pad 24, and an air cylinder 12 a for fixing the gantry 11. The device 5 is equipped with a cyclone device 26 and a vacuum device 27.

  The operation table 4 includes a gate valve 30, a one-touch joint 31, a direction switching valve 32, a pressure reducing valve 33, a lubricator 34, a ball valve 35, and the like. The compressed air path to the feed cylinder 23 and the rock drill 16 is supplied with mist-like lubricating oil from the lubricator 34 to facilitate the operation of these devices. In the compressed air path to the feed cylinder 23, in addition to the direction switching valve 32 and the pressure reducing valve 33, a variable throttle valve 36 with a check valve for controlling the flow rate of the compressed air is installed on the drilling device 10 side. Direction switching valves 32 are also installed in compressed air paths to the air cylinder 25 for the dust collection pad 24 and the air cylinder 12a for fixing the gantry 11, respectively.

  The vacuum device 27 has a well-known configuration using the pressure difference of the venturi pipe, and generates a negative pressure between the nozzle whose pipe diameter is rapidly reduced and the pipe line where the pipe diameter gradually increases thereafter. . A vortex flow is formed in the cyclone device 26 by the suction hose 28 connected to the negative pressure portion of the vacuum device 27, and the dust collected through the suction hose 28 connected to the dust collecting pad 24 is separated and collected. .

  Next, with reference to FIG. 6, FIG. 7, the effect by the drilling apparatus 10 which concerns on this embodiment is demonstrated. FIG. 6 is an explanatory view showing each drilling state by the joint only method. According to the drilling device 10 having the above configuration, as shown in FIG. 6A, the tunnel width or the length of the space available for drilling operation is w, the length of the rock drill 16 is m, and the rod is attached. When the length of the margin is a, the length r1 of the first stage drilling rod 22-1 is the longest (w−m). Then, when the first stage drilling is performed by the first stage drilling rod 22-1 having a length of (w−m), the rock drill 16 includes the dust collecting pad 24 and the like as shown in (B). Due to the presence of, the distance b between the tunnel wall and the front of the apparatus is moved to finish the drilling. At this time, the first-stage drilling rod 22-1 moves forward by a drilling distance l1 obtained by subtracting the length a and the distance b from the length r1, and the rock drill 16 is connected to the first-stage drilling hole. The rod 22-1 moves forward by a distance (l1 + a) obtained by adding the rod a to the drilling distance l1 and the length a.

  Next, as shown in (C), the rock drill 16 is moved backward and tilted upward, or retracted along the retracting guide rail 14 in the left-right direction of the device, and the second-stage drilling rod 22-2 is installed. At this time, the length r2 of the second stage drilling rod 22-2 is the longest (wmba). The second stage drilling rod 22-2 can be advanced by a drilling distance l2 having the same length as the length r2, and the rock drill 16 can drill the drilling distance of the second stage drilling rod 22-2. It is possible to move forward by a distance (l2 + a) obtained by adding the rod a to l2 and adding the length a.

  On the other hand, when the rock drill 16 can only move rearward and cannot tilt or retreat, the length r2 ′ of the second stage drilling rod 22-2 is at most (wm−b− ac). Since the second-stage drilling rod 22-2 can advance by a drilling distance l2 'having the same length as the length r2', the drilling distance l2 'is shorter than that in the above embodiment.

  Moreover, FIG. 7 is explanatory drawing which shows each drilling state by a replacement | exchange only system. Since the states shown in FIGS. 7A and 7B are the same as the states shown in FIGS. 6A and 6B, description thereof is omitted. As shown in FIG. 7C, according to the drilling device 10 having the above-described configuration, the rock drill 16 is moved backward and tilted upward or along the retraction guide rail 14 in the left-right direction of the device. The drilling rod 22-11 is inserted into the drilled hole, and the rear end of the replacement drilling rod 22-11 is held by the rock drill 16. In a state where the replacement drill rod 22-11 is inserted into the drilled hole, the length L of the replacement drill rod 22-11 to be held by the rock drill 16 is the longest (w + l1-m). It becomes. In the present embodiment, the rock drill 16 is tilted upward or is retracted in the left-right direction of the apparatus along the guide rail 14 for retraction, so that the replacement drilling rod 22-11 having a length L is formed into a drilled hole. Can be inserted.

On the other hand, when the rock drill 16 can only move rearward and cannot tilt or retreat, the length r2 ′ of the second-stage drilling rod 22-2 is the same as (w + l1-m) at the longest. Although it is a value, since the rock drill 16 cannot be tilted or retracted, the length L ′ of the replacement drill rod 22-11 that can be inserted into the drilled hole unless the drilling device 10 itself is moved. Becomes (w−m) at the longest. However, once the drilling device 10 is moved, it is difficult to hold the replacement drilling rod 22-11 set in the drilled hole on the rod holder 16a of the rock drill 16 and work efficiency is reduced. I will lower it.

  Thus, in the hole drilling device 10 according to the present embodiment, the slider 18 slides along the guide rail 14 for retraction, and the guide cell 15 is in a direction substantially perpendicular to the axial direction (device longitudinal direction) (device left and right). Slidable in the direction) or tilted in the vertical direction about the rear portion 16c of the rock drill body 16b, or the second-stage drilling rod 22-2 or the replacement drilling rod 22 Since the rock drill body 16b can be retracted without moving the gantry 11 when setting -1, the length r2 of the second stage drilling rod 22-2 or the replacement drilling rod 22- The length L of 1 can be increased. And since it is not necessary to move the mount frame 11, it is possible to perform these joint work or replacement work easily and in a short time. Since the steel pipe 14a is substantially horizontal, the slider 18 can be easily moved manually.

  In addition, the rear frame fixing device 12 is attached to the upper rear side of the frame 11, and the front frame fixing device 13 is mounted to the upper front side of the frame 11, so that the frame 11 is fixed in the front-rear direction with respect to the drilling direction. The Therefore, even if a large load is applied to the rock drill, the backward movement of the gantry 11 is prevented by taking a reaction force during drilling through the rear gantry fixing device 12. Further, since the rear gantry fixing device 12 is driven by the air cylinder 12a, loosening of the gantry 11 due to vibration during drilling is also prevented. In addition, both gantry fixing devices 12 and 13 are efficiently attached to the reaction force and vibration by the rock drill 16 even when the gantry 11 is extended by being attached to the gantry upper part 11b that moves up and down. Can be done.

  Further, since the gantry 11 includes the lifting mechanism 11a, drilling at different height positions is possible without moving the gantry 11. Further, when drilling with the gantry 11 extended, when setting the second-stage drilling rod 22-2 or the replacement drilling rod 22-11, the rock drill body 16b is tilted or guided. Even if the cell 15 is not moved horizontally, the same function can be exhibited by contracting the gantry 11 by the lifting mechanism 11a.

  Furthermore, drilling in various directions is possible by providing the guide cell 15 so as to be tiltable. Since the gantry 11 includes the moving wheels 17 and the stoppers, not only the gantry 11 can be moved easily, but also the gantry 11 does not move during drilling, and drilling can be performed at an accurate position. In addition, the setting of the second-stage drilling rod 22-2 or the replacement drilling rod 22-11 is also easy.

  And, even if the working space is limited, the hole drilling device 10 increases the possible drilling length of the joint only method as much as possible, or the number of times of rod jointing for drilling a predetermined length. By reducing the number, work efficiency can be improved.

  This is the end of the description of specific embodiments, but the present invention is not limited to these embodiments. For example, in the above embodiment, the two rear frame fixing devices 12 are attached in parallel to each other as the first fixing means, and the two front frame fixing devices 13 are attached in parallel to each other as the second fixing means. At least one of the first fixing means and the second fixing means may be one. In particular, by providing either one of the first and second fixing means as one point and supporting the three points, it is possible not only to secure the gantry but also to facilitate the gantry fixing work. Furthermore, when drilling in an oblique direction with respect to the tunnel wall surface in plan view, it is desirable to use two second fixing means (front parts).

  In the above embodiment, the guide cell is provided so as to be slidable substantially horizontally in the left-right direction of the apparatus. However, the guide cell may be provided so as to slide vertically or obliquely. The rock drill main body can be tilted up and down around the rear part, but may be provided so as to tilt left and right (horizontal direction) around the rear part. Further, the expansion / contraction mechanism of the gantry may be configured not to move up and down while keeping the upper part of the gantry horizontal but to have a function of tilting the guide cell up and down in the expansion and contraction function of the gantry. In addition to these changes, changes can be made as appropriate without departing from the spirit of the present invention.

Longitudinal sectional view of a tunnel for rock bolt construction using the drilling device of the present invention Side view of drilling device Plan view of drilling device Side view of drilling device Piping diagram for drilling equipment Explanation of operation of drilling device by joint only method Explanation of operation of drilling device using only replacement Explanatory drawing showing the state of drilling in a tunnel according to the prior art Explanatory drawing showing the state of drilling in a tunnel according to the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel 2 Air hose 3 Compressor 4 Operation base 5 Dust collector 10 Drilling device 11 Base 11a Lifting mechanism, 11b Base top 12 Rear base fixing device, 12a Air cylinder 13 Front base fixing device, 13a Manual length adjustment part 14 Retraction Guide rail 15 Guide cell 16 Rock drill 16a Rod holding part, 16b Rock drill body, 16c Rear part, 16d Slider part 17 Wheel 18 Slider 22 Drilling rod 22-1 First stage drilling rod, 22-2 Two stages Drilling hole rod 22-11 Replacement drilling rod

Claims (6)

A frame,
An axial guide cell provided on the mount;
A rock drill which is slidably provided on the guide cell and has a holding portion for holding a drilling rod at the front, and which gives a rotational force and a striking force in the axial direction to the drilling rod. Equipped with a machine,
A drilling device, wherein the guide cell is provided to be slidable in a direction substantially perpendicular to the axial direction thereof. A frame,
An axial guide cell provided on the mount;
A rock drill which is slidably provided on the guide cell and has a holding portion for holding a drilling rod at the front, and which gives a rotational force and a striking force in the axial direction to the drilling rod. Equipped with a machine,
A drilling device, wherein the rock drill is provided to be tiltable about a rear portion thereof.   A first gantry fixing means which is extendable and contracted substantially parallel to the axial direction of the guide cell and protrudes in a direction opposite to the drilling direction; and a retractable and drilling direction substantially parallel to the axial direction of the guide cell. The hole drilling device according to claim 1, further comprising a second gantry fixing means that protrudes toward the bottom.   The drilling device according to claim 3, wherein at least one of the first gantry fixing means and the second gantry fixing means is extended by driving an air cylinder.   The drilling device according to any one of claims 1 to 4, wherein the gantry includes an elevating mechanism that expands and contracts vertically.   The drilling device according to any one of claims 1 to 5, wherein the guide cell is tiltably provided.

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