Adjustable drilling support for arch tunnel

Abstract

The present invention relates to the technical field of drilling equipment, and in particular to an adjustable drilling support for an arched tunnel, which includes a base plate, a support member, a tightening member and an adjustment control. When drilling an arched tunnel, the drilling position is first determined, and according to the drilling position, the specific orientation of the base plate inside the tunnel is adjusted, and a first rod or a second rod in the support member is inserted into a fixed seat, wherein the drilling arm is arranged on the second rod. If the horizontal height of the drilling position is greater than the length of the second rod, the adjustment control can adjust the first rod to a state of being inserted into the fixed seat. At this time, the upper end of the second rod is connected to the fixing plate through a second connecting head, and the tightening rod on the fixing rod can abut against the top wall of the tunnel, thereby ensuring that the first rod and the second rod remain in a stable state. The drilling arm is arranged on the second rod, and the horizontal height of the drilling arm on the second rod can be adjusted, thereby facilitating drilling at any height position, thereby improving the accuracy of drilling.

Description

Technical Field

[0001] The invention relates to the technical field of drilling equipment, and in particular to an adjustable drilling bracket for an arched tunnel. Background Art

[0002] Drilling is a common and critical step in tunnel construction. Drilling brackets serve as crucial tools for securing and assisting drilling equipment. Existing drilling brackets on the market, when used in arched tunnels, have limited adjustment capabilities for their drilling arms, often only allowing for flexible adjustment in the middle and lower areas. However, in actual construction, a large number of holes are also required in the upper areas, and existing drilling brackets on the market are unable to effectively adjust these locations, thus affecting drilling accuracy.

[0003] In addition, due to the particularity of the arch structure, the existing drilling bracket can usually only be supported in the middle part of the arch. In order to enable the drilling equipment to slide to the target drilling area, an extra-long drilling arm has to be used. However, the extra-long drilling arm is prone to shaking, deformation and other problems due to uneven force during use, affecting the accuracy and stability of drilling. Summary of the Invention

[0004] The invention provides an adjustable drilling support for an arched tunnel, so as to solve the problem that the existing drilling support affects the drilling accuracy.

[0005] The adjustable drilling support for an arched tunnel of the present invention adopts the following technical solution:

[0006] An adjustable drilling support for an arched tunnel comprises a base plate, a supporting member, a tightening member and an adjustment control member.

[0007] The bottom plate is provided with a fixing seat with an opening facing upward; the support member includes a first rod and a second rod, the first rod and the second rod are both arranged vertically, the first rod and the second rod are slidably connected, and the first rod and the second rod can both be inserted into the fixing seat; a drilling arm is provided on the second rod, and the horizontal height of the drilling arm on the second rod can be adjusted; the tightening rod is arranged vertically, the tightening rod can be telescopically arranged, and the upper end of the tightening rod can abut the top wall of the tunnel; a fixing plate is provided at the lower end of the tightening rod, and a first joint and a second joint are provided on the fixing plate, the first joint can be connected to the upper end of the first rod, and the second joint can be connected to the upper end of the second rod; the adjustment control can adjust the first rod to be inserted into the fixing seat, and at the same time adjust the upper end of the second rod to be connected to the tightening rod through the second joint; the adjustment control can also adjust the second rod to be inserted into the fixing seat, and at the same time adjust the upper end of the first rod to be connected to the tightening rod through the first joint.

[0008] Furthermore, a hinged rod is provided on the fixing plate, one end of the hinged rod is hinged to the upper end surface of the fixing plate, the hinged rod has a first length and a second length, the first length is greater than the second length, and a fixing block is provided on the top wall of the tunnel, and the end of the hinged rod away from the fixing plate can abut against the fixing block; when the hinged rod abuts against the fixing block with the first length, a first angle is formed between the hinged rod and the tightening rod, and when the hinged rod abuts against the fixing block with the second length, a second angle is formed between the hinged rod and the tightening rod, and the first angle is smaller than the second angle; when the second rod is inserted into the fixing seat and the drilling arm is in the lower half of the second rod, the hinged rod is at the second length.

[0009] Furthermore, the hinged rod includes a first section and a second section, the first section is hinged to the fixed plate, the first section is hollow inside, and one end of the second section is slidably inserted into the first section; a first adjustment hole is provided on the first section, and two second adjustment holes are provided on the second section, and the two second adjustment holes are spaced apart along the length direction of the second section; an adjustment rod is provided in the first adjustment hole, and the adjustment rod can enter any one of the second adjustment holes.

[0010] Furthermore, the adjustment control includes a fixed rack and a sliding block, a vertical guide rail is provided on the second rod, the sliding block is slidably arranged along the guide rail, and a first locking member is provided on the sliding block, and the first locking member is used to fix the sliding block on the guide rail; the fixed rack is fixedly provided on the first rod, and an adjustment gear is rotatably provided on the sliding block, and the adjustment gear is always engaged with the fixed rack.

[0011] Furthermore, the first locking member includes a plurality of first screws, the first screws are threadedly connected to the sliding block, and the first screws can abut against the second rod.

[0012] Furthermore, a connecting block is hinged at the end of the drilling arm, and the connecting block can be slidably arranged along the second rod. A second locking piece is provided on the connecting block, and the second locking piece is used to fix the connecting block at any position of the second rod.

[0013] Furthermore, a vertical adjustment rack is fixedly provided on the second rod, and a rotating gear is rotatably provided on the connecting block, and the rotating gear is always engaged with the adjustment rack.

[0014] Furthermore, the second locking member includes a plurality of second screws, the second screws are threadedly connected to the connecting block, and the second screws can abut against the second rod.

[0015] Furthermore, an auxiliary block is slidably provided on the drilling arm, an auxiliary rod is hinged on the auxiliary block, the other end of the auxiliary rod is hinged to the connecting block, and the auxiliary rod is used to provide auxiliary support to the drilling arm.

[0016] Furthermore, the tightening rod includes a fixed section and a sliding section, the fixed section is fixedly connected to the fixed plate, the interior of the fixed section is hollow, and one end of the sliding section is slidably inserted into the interior of the fixed section; a compression spring is provided inside the fixed section, one end of the compression spring is fixedly connected to the sliding section, and the other end of the compression spring is fixedly connected to the fixed section.

[0017] The beneficial effects of the present invention are as follows: an adjustable drilling support for an arched tunnel of the present invention comprises a base plate, a support member, a tightening member and an adjustment control member. When drilling an arched tunnel, the drilling position is first determined. According to the drilling position, the specific orientation of the base plate inside the tunnel is adjusted, and the first rod or the second rod in the support member is inserted into the fixed seat, wherein the drilling arm is arranged on the second rod, and the height of the drilling arm on the second rod can be adjusted by the staff. If the horizontal height of the drilling position is greater than the length of the second rod, the adjustment control member can adjust the first rod to a state of being inserted into the fixed seat. At this time, the upper end of the second rod is connected to the fixing plate through the second connecting head, and the tightening rod on the fixing rod can abut the top wall of the tunnel, thereby ensuring that the first rod and the second rod remain in a stable state. The drilling arm is arranged on the second rod, and the horizontal height of the drilling arm on the second rod can be adjusted, so as to facilitate drilling at any height position, thereby improving the accuracy of drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic structural diagram of an adjustable drilling support for an arched tunnel provided by an embodiment of the present invention;

[0020] Figure 2 A cross-sectional view of an adjustable drilling support for an arched tunnel provided by an embodiment of the present invention;

[0021] Figure 3 A diagram showing a state in which the upper end of a first rod in an adjustable drilling support for an arched tunnel provided by an embodiment of the present invention is connected to a first joint;

[0022] Figure 4A diagram showing a state in which the upper end of a second rod in an adjustable drilling support for an arched tunnel provided by an embodiment of the present invention is connected to a second joint;

[0023] Figure 5 A diagram showing a state in which a hinged rod of an adjustable drilling support for an arched tunnel provided by an embodiment of the present invention is at a first length;

[0024] Figure 6 A diagram showing a state in which a hinged rod of an adjustable drilling support for an arched tunnel provided by an embodiment of the present invention is at a second length;

[0025] Figure 7 for Figure 2 A partial enlarged view of point A in the middle;

[0026] Figure 8 A schematic structural diagram of a hinged rod and a jacking rod in an adjustable drilling support for an arched tunnel provided by an embodiment of the present invention;

[0027] Figure 9 A cross-sectional view of a hinged rod and a jacking rod in an adjustable drilling support for an arched tunnel provided by an embodiment of the present invention.

[0028] In the figure: 110, base plate; 120, fixed seat; 130, first rod; 140, second rod; 150, drilling arm; 160, drilling equipment; 170, tightening rod; 171, fixed section; 172, sliding section; 173, compression spring; 180, hinged rod; 181, first section; 182, second section; 190, fixed block; 210, fixed rack; 220, sliding block; 230, connecting block; 240, adjusting rack; 250, auxiliary block; 260, auxiliary rod. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like, indicating positions or relationships, are based on those shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or element referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0032] like Figures 1 to 9 As shown, an embodiment of the present invention provides an adjustable drilling support for an arched tunnel, which includes a base plate 110, a support member, a tightening member and an adjustment control member.

[0033] The bottom plate 110 is provided with rotating wheels, which can facilitate the staff to move the bottom plate 110. The bottom plate 110 has a horizontal upper end surface, and the upper end surface of the bottom plate 110 is provided with a fixing seat 120, and the fixing seat 120 has a fixing groove with an opening facing upward.

[0034] The support member includes a first rod 130 and a second rod 140, both of which are vertically arranged and slidably connected. The lower ends of the first rod 130 and the second rod 140 can be inserted into the fixing groove of the fixing base 120. Furthermore, the second rod 140 has a C-shaped cross-section, and the second rod 140 is arranged to semi-enclose the first rod 130. A drilling arm 150 is mounted on the outer wall of the second rod 140. A drilling device 160 can slide on the drilling arm 150, allowing the drilling arm 150 to be adjusted in height relative to the second rod 140. Furthermore, the angle between the drilling arm 150 and the second rod 140 is adjustable, facilitating drilling at any angle within the arched tunnel.

[0035] The jacking rod 170 is vertically arranged and can be telescopically arranged. In the initial state, the jacking rod 170 is in its longest state. The upper end of the jacking rod 170 can abut the tunnel ceiling. The lower end of the jacking rod 170 is provided with a fixing plate, and the fixing plate is provided with a first joint and a second joint. The first joint and the second joint are both arranged on the lower end surface of the fixing plate. The first joint can be connected to the upper end of the first rod 130, and the second joint can be connected to the upper end of the second rod 140. When the lower end of the second rod 140 is inserted into the fixing groove of the fixing seat 120, the upper end of the first rod 130 is connected to the fixing plate via the first joint. Correspondingly, when the lower end of the first rod 130 is inserted into the fixing groove of the fixing seat 120, the upper end of the second rod 140 is connected to the fixing plate via the second joint. The adjustment control can adjust the insertion of the first rod 130 or the second rod 140 into the fixing groove, and the adjustment control can also adjust the connection of the first rod 130 or the second rod 140 to the fixing plate. By adjusting the first rod 130 or the second rod 140 to be inserted into the fixing slot through the adjustment control, the drilling arm 150 can be adjusted to any height, thereby facilitating the worker to drill at any height position.

[0036] The present invention relates to an adjustable drilling support for an arched tunnel. When drilling a hole in an arched tunnel, the drilling position is first determined. Based on the drilling position, the specific orientation of the base plate 110 within the tunnel is adjusted. The first rod 130 or the second rod 140 of the support member is then inserted into the fixing seat 120. A drilling arm 150 is mounted on the second rod 140, and the height of the drilling arm 150 on the second rod 140 can be adjusted by the operator. If the drilling position is higher than the length of the second rod 140, an adjustment control can be used to adjust the first rod 130 to a position inserted into the fixing seat 120. At this point, the upper end of the second rod 140 is connected to the fixing plate via a second connector. The tightening rod 170 on the fixing rod can abut against the tunnel ceiling, thereby ensuring that the first rod 130 and the second rod 140 remain stable. The drilling arm 150 is then mounted on the second rod 140, and its height can be adjusted relative to the second rod 140. This facilitates drilling at any height, thereby improving drilling accuracy.

[0037] In one embodiment, a hinged rod 180 is provided on the fixed plate, and one end of the hinged rod 180 is hinged to the upper end surface of the fixed plate. The hinged rod 180 has a first length and a second length, wherein the first length is greater than the second length. When the hinged rod 180 is at the first length, the length of the hinged rod 180 is greater than the initial length of the tensioning rod 170. When the hinged rod 180 is at the second length, the length of the hinged rod 180 is less than the initial length of the tensioning rod 170. A fixed block 190 is provided on the top wall of the tunnel, wherein the fixed block 190 can be set according to the drilling position. The fixed block 190 is fixedly connected to the top wall of the tunnel by an expansion bolt. The end of the hinged rod 180 away from the fixed plate can abut the fixed block 190. In the initial state, the hinged rod 180 and the tensioning rod 170 are set to be parallel to each other.

[0038] When it is necessary to drill a hole in the side wall of an arched tunnel, the staff first sets a fixed block 190 according to the location of the hole to be drilled. The fixed block 190 is fixed on the inner wall of the arched tunnel, and the fixed block 190 and the drilling location are set in the same vertical plane. In the vertical direction, the fixed block 190 is set above the drilling location. Subsequently, the staff pushes the bottom plate 110 to move near the drilling location, and compares the horizontal height of the drilling location with the length of the second rod 140. If the length of the second rod 140 is greater than the horizontal height of the drilling location, the control unit controls the lower end of the second rod 140 to be inserted into the fixing groove of the fixing seat 120, and adjusts the position of the drilling arm 150 on the second rod 140 so that the drilling equipment 160 corresponds to the drilling location. At this time, the upper end of the first rod 130 is connected to the fixing plate through the first joint, so that the tightening rod 170 abuts against the top wall of the tunnel. During the process, the articulated rod 180 is in a state of a first length, and the time when the articulated rod 180 contacts the tunnel top wall is earlier than the time when the tightening rod 170 abuts the tunnel top wall. Under the guidance of the arched tunnel top wall, the articulated rod 180 rotates relative to the fixed plate. During this process, the tightening rod 170 is continuously shortened. When the articulated rod 180 abuts the fixed block 190, the tightening rod 170 no longer shortens. At this time, the tightening rod 170 and the articulated rod 180 jointly fix the upper end of the first rod 130, thereby improving the stability of the first rod 130 and the second rod 140 during the drilling process.

[0039] When the length of the second rod 140 is less than the horizontal height of the drilling position, the adjustment control controls the lower end of the first rod 130 to be inserted into the fixing groove of the fixing seat 120, and adjusts the position of the drilling arm 150 on the second rod 140 so that the drilling equipment 160 corresponds to the drilling position. At this time, the upper end of the second rod 140 is connected to the fixing plate through the second joint, so that the tightening rod 170 abuts the tunnel top wall. During the process, the hinged rod 180 is in a state of the first length, and the time when the hinged rod 180 contacts the tunnel top wall is earlier than the time when the tightening rod 170 abuts the tunnel top wall. Under the guidance of the arched tunnel top wall, the hinged rod 180 rotates relative to the fixing plate. During this process, the tightening rod 170 continues to shorten. When the hinged rod 180 abuts the fixing block 190, the tightening rod 170 no longer shortens. At this time, the tightening rod 170 and the hinged rod 180 jointly fix the upper end of the second rod 140, thereby improving the stability of the first rod 130 and the second rod 140 during the drilling process.

[0040] Furthermore, when the articulated rod 180 abuts the fixed block 190 at a first length, a first angle is formed between the articulated rod 180 and the tightening rod 170. When the articulated rod 180 abuts the fixed block 190 at a second length, a second angle is formed between the articulated rod 180 and the tightening rod 170, and the first angle is smaller than the second angle. When the second rod 140 is inserted into the fixing seat 120 and the drilling arm 150 is at the lower half of the second rod 140, the articulated rod 180 is at the second length. When the drilling position is close to the ground, the adjustment control controls the lower end of the second rod 140 to be inserted into the fixing groove of the fixing seat 120, and adjusts the position of the drilling arm 150 on the second rod 140 so that the drilling equipment 160 corresponds to the drilling position. At this time, the upper end of the first rod 130 is connected to the fixing plate through the first joint, so that the tightening rod 170 abuts the top wall of the tunnel. During the process, the articulated rod 180 is at the second length. In the state of length, the time when the hinged rod 180 contacts the tunnel top wall is later than the time when the tightening rod 170 abuts the tunnel top wall. Under the guidance of the arched tunnel top wall, the hinged rod 180 rotates relative to the fixed plate. During this process, the tightening rod 170 is continuously shortened. When the hinged rod 180 abuts the fixed block 190, the tightening rod 170 no longer shortens. At this time, the tightening rod 170 and the hinged rod 180 jointly fix the upper end of the first rod 130, and the shortening degree of the tightening rod 170 is increased, further improving the stability of the first rod 130 and the second rod 140 during the drilling process.

[0041] In one embodiment, the jacking rod 170 includes a fixed section 171 and a sliding section 172. The fixed section 171 is fixedly connected to the fixed plate and is hollow inside. One end of the sliding section 172 is slidably inserted into the fixed section 171. A compression spring 173 is disposed inside the fixed section 171. One end of the compression spring 173 is fixedly connected to the sliding section 172, and the other end of the compression spring 173 is fixedly connected to the fixed section 171. In the initial state, the length of the jacking rod 170 is at its longest state, and the compression spring 173 is at its original length. As the length of the jacking rod 170 gradually decreases, the amount of compression of the compression spring 173 gradually increases, and the extrusion force of the upper end of the jacking rod 170 on the tunnel ceiling gradually increases. The extrusion force of the lower end of the jacking rod 170 on the upper end of the first rod 130 or the upper end of the second rod 140 gradually increases, thereby improving the stability of the first rod 130 and the second rod 140 during the drilling process.

[0042] In one embodiment, the hinged rod 180 includes a first section 181 and a second section 182. The first section 181 is hinged to the fixed plate and is hollow. One end of the second section 182 is slidably inserted into the first section 181, so that the first section 181 and the second section 182 are always coaxial. The first section 181 is provided with a first adjustment hole. The second section 182 is provided with two second adjustment holes, which are spaced apart along the length of the second section 182. An adjustment rod is provided in the first adjustment hole, and the adjustment rod can enter any of the second adjustment holes. When the adjustment rod is simultaneously in one of the second adjustment holes and the first adjustment hole, the adjustment rod can limit the change in the length of the hinged rod 180. The operator can adjust the second adjustment hole where the adjustment rod is located according to the drilling position, thereby changing the length of the hinged rod 180.

[0043] In one embodiment, the adjustment control includes a fixed rack 210 and a sliding block 220. A vertical guide rail is provided on the second rod 140, and the sliding block 220 slides along the guide rail. The sliding block 220 is provided with a first locking member, which is used to secure the sliding block 220 to the guide rail. The provision of the first locking member fixes the position of the sliding block 220 on the second rod 140. The fixed rack 210 is fixedly provided on the first rod 130 and extends along the length of the first rod 130. An adjustment gear is rotatably provided on the sliding block 220, and the adjustment gear is constantly engaged with the fixed rack 210. When the hinged rod 180 is not abutting the fixed block 190, the operator needs to continuously rotate the adjustment gear to cause relative movement between the first rod 130 and the second rod 140. The operator adjusts the direction of rotation of the adjustment gear based on whether the lower end of the first rod 130 or the second rod 140 is inserted into the fixed slot. For example, when the lower end of the first rod 130 is inserted into the fixed groove, the staff rotates the adjusting gear clockwise to gradually move the upper end of the second rod 140 upwards. When the lower end of the second rod 140 is inserted into the fixed groove, the staff rotates the adjusting gear counterclockwise to gradually move the upper end of the first rod 130 upwards. When rotating the adjusting gear, the first locking member is in a state of fixing the sliding block 220 on the guide rail.

[0044] In one embodiment, the first locking member includes multiple first screws, which are threadedly connected to the sliding block 220. The first screws can abut the second rod 140. The staff ensures that each first screw remains in a state of pressing the second rod 140 by rotating the multiple first screws one by one, thereby fixing the sliding block 220 on the guide rail. After the sliding block 220 is fixed on the guide rail, the staff can rotate the adjusting gear to ensure that the upper end of the tightening rod 170 abuts the top wall of the tunnel.

[0045] In one embodiment, the end of the drilling arm 150 is hinged with a connecting block 230, which can be slidably arranged along the second rod 140. A second locking member is provided on the connecting block 230, and the second locking member is used to fix the connecting block 230 at any position of the second rod 140. By providing the connecting block 230 and the second locking member, it is ensured that the drilling arm 150 can form any angle with the second rod 140, and that the drilling arm 150 can be arbitrarily adjusted in height to the second rod 140.

[0046] In one embodiment, a vertical adjustment rack 240 is fixedly provided on the second rod 140, and a rotating gear is rotatably provided on the connecting block 230. The rotating gear is always engaged with the adjustment rack 240. When it is necessary to adjust the position of the drilling arm 150 on the second rod 140, the staff rotates the rotating gear to change the height direction of the connecting block 230 on the second rod 140, thereby facilitating the correspondence of the drilling equipment 160 with the drilling position.

[0047] In one of the company's embodiments, the second locking member includes a plurality of second screws, which are threadedly connected to the connecting block 230. The second screws can abut the second rod 140. The staff adjusts the connecting block 230 in the height direction of the second rod 140 by rotating the rotating gear. After the connecting block 230 is adjusted in the height direction of the second rod 140, the staff simultaneously rotates the plurality of second screws to fix the position of the connecting block 230 on the second rod 140, thereby improving the stability of the punching equipment during the punching process.

[0048] In one embodiment, an auxiliary block 250 is slidingly provided on the drilling arm 150, and the auxiliary block 250 can slide along the length direction of the drilling arm 150. An auxiliary rod 260 is hinged on the auxiliary block 250, and the other end of the auxiliary rod 260 is hinged to the connecting block 230. The auxiliary rod 260 is used to provide auxiliary support to the drilling arm 150. Since the drilling arm 150 and the connecting block 230 are in a hinged state, when the drilling equipment 160 is installed on the drilling arm 150, the drilling arm 150 is easy to rotate relative to the connecting block 230. When the drilling equipment 160 corresponds to the drilling position, there is a certain angle between the auxiliary rod 260 and the drilling arm 150. The staff will limit the sliding of the auxiliary block 250 on the drilling arm 150, and the auxiliary rod 260 can form a diagonal support rod, thereby ensuring the stability of the drilling arm 150 during work.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adjustable drilling support for an arched tunnel, characterized in that: include: The bottom plate is provided with a fixing seat with an upward opening; the fixing seat has a fixing groove with an upward opening; The support member includes a first rod and a second rod, the first rod and the second rod are both vertically arranged, the first rod and the second rod are slidably connected, and the first rod and the second rod are both capable of being inserted into the fixing groove; a drilling arm is provided on the second rod, the horizontal height of the drilling arm on the second rod is adjustable, and the angle between the drilling arm and the second rod is adjustable; A jacking rod, the jacking rod is vertical and can be telescopically arranged, and the upper end of the jacking rod can abut the top wall of the tunnel; a fixing plate is provided at the lower end of the jacking rod, and a first joint and a second joint are provided on the fixing plate, the first joint can be connected to the upper end of the first rod, and the second joint can be connected to the upper end of the second rod; An adjustment control is provided, wherein the adjustment control can adjust the first rod to be inserted into the fixing slot and simultaneously adjust the upper end of the second rod to be connected to the tightening rod via the second joint; the adjustment control can also adjust the second rod to be inserted into the fixing slot and simultaneously adjust the upper end of the first rod to be connected to the tightening rod via the first joint; by adjusting the first rod or the second rod to be inserted into the fixing slot, the drilling arm can be adjusted to any height; The fixing plate is provided with a hinged rod, one end of which is hingedly connected to the upper end surface of the fixing plate, the hinged rod having a first length and a second length, the first length being greater than the second length, and a fixing block is provided on the top wall of the tunnel, the end of the hinged rod away from the fixing plate being able to abut against the fixing block; in an initial state, the hinged rod and the preload rod are set to be parallel to each other; When the hinged rod abuts the fixed block at a first length, a first angle is formed between the hinged rod and the tensioning rod; when the hinged rod abuts the fixed block at a second length, a second angle is formed between the hinged rod and the tensioning rod, and the first angle is smaller than the second angle; when the second rod is inserted into the fixing groove and the drilling arm is in the lower half of the second rod, the hinged rod is at the second length; in the initial state, the hinged rod and the pre-tightening rod are set to be parallel to each other; The adjustment control comprises a fixed rack and a sliding block. A vertical guide rail is provided on the second rod. The sliding block slides along the guide rail. A first locking member is provided on the sliding block. The first locking member is used to fix the sliding block on the guide rail. The fixed rack is fixedly provided on the first rod. An adjustment gear is rotatably provided on the sliding block. The adjustment gear is always engaged with the fixed rack. A connecting block is hinged at the end of the drilling arm, and the connecting block can be slidably set along the second rod. A second locking piece is provided on the connecting block, and the second locking piece is used to fix the connecting block at any position of the second rod; a vertical adjustment rack is fixed on the second rod, and a rotating gear is rotatably set on the connecting block, and the rotating gear is always engaged with the adjustment rack.

2. The adjustable drilling support for an arched tunnel according to claim 1, characterized in that: The hinged rod includes a first section and a second section. The first section is hinged to the fixed plate. The first section is hollow inside, and one end of the second section is slidably inserted into the first section. A first adjustment hole is provided on the first section, and two second adjustment holes are provided on the second section. The two second adjustment holes are spaced apart along the length direction of the second section. An adjustment rod is provided in the first adjustment hole, and the adjustment rod can enter any second adjustment hole.

3. The adjustable drilling support for an arched tunnel according to claim 1, characterized in that: The second locking member includes a plurality of second screws, the second screws are threadedly connected to the connecting block, and the second screws can abut against the second rod.

4. The adjustable drilling support for an arched tunnel according to claim 1, characterized in that: An auxiliary block is slidably provided on the drilling arm, an auxiliary rod is hinged on the auxiliary block, and the other end of the auxiliary rod is hinged to the connecting block. The auxiliary rod is used for auxiliary support of the drilling arm.

5. The adjustable drilling support for an arched tunnel according to claim 1, characterized in that: The tightening rod includes a fixed section and a sliding section. The fixed section is fixedly connected to the fixed plate. The fixed section is hollow inside. One end of the sliding section is slidably inserted into the fixed section. A compression spring is provided inside the fixed section. One end of the compression spring is fixedly connected to the sliding section, and the other end of the compression spring is fixedly connected to the fixed section.

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