A steel section welding positioning device and method for tunnel steel arch support

Abstract

The present invention provides a steel section welding positioning device and method for tunnel steel arch support, which belongs to the technical field of tunnel construction. The steel section welding positioning device includes a sliding seat, which is arranged between two adjacent arch beams and can slide along the length direction of the arch beam. A support frame is arranged on the side of the sliding seat facing the inside of the arch beam, and a positioning mechanism is rotatably arranged on the end of the support frame away from the sliding seat. The positioning mechanism includes a support assembly for supporting the steel section to be welded and an abutment assembly for driving the support assembly to move in a direction close to the arch beam; the abutment assembly includes an abutment frame, which is rotatably arranged on the support frame through a rotating shaft, and a telescopic member is arranged on the end of the abutment frame away from the rotating shaft, and the telescopic member is used to drive the support assembly to move in a direction close to the arch beam so that the steel section abuts against the arch beam. The present invention can conveniently position the steel section before welding, thereby facilitating the welding process.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a steel section welding positioning device for tunnel steel arch support. Background Art

[0002] Steel arch support is a support measure that uses steel to reinforce underground projects. During the installation and production of tunnel steel arch support, multiple steel sections need to be welded between two adjacent arch beams. If there is an error in welding, it will cause deviations in the assembly of the arch during the initial support construction of the tunnel, causing the steel arch to twist and even affecting the initial support steel arch stress structure, posing a huge safety and quality hazard. Therefore, the welding quality of the steel arch steel is extremely important.

[0003] Currently, when welding steel sections to arch beams, it is necessary to hold the steel sections in place while welding. For heavy steel sections, one worker is required to manually hold the steel sections in the designated position of the arch beam while another worker welds. The welding process is inconvenient and the welding quality is difficult to guarantee. Summary of the invention

[0004] The object of the present invention is to provide a steel section welding positioning device for tunnel steel arch support, which can conveniently position the steel section before welding, thereby facilitating the welding process.

[0005] The present invention is realized by the following technical scheme: a steel section welding positioning device for tunnel steel arch support, comprising a sliding seat, the sliding seat is arranged between two adjacent arch beams and can slide along the length direction of the arch beam, a support frame is arranged on the side of the sliding seat facing the inside of the arch beam, and a positioning mechanism is rotatably arranged on the end of the support frame away from the sliding seat, the positioning mechanism comprises a supporting assembly for supporting the steel section to be welded and an abutting assembly for driving the supporting assembly to move in a direction close to the arch beam; the sliding seat comprises a main support and abutting assemblies arranged at both ends of the main support A limit seat, two limit seats are slidably arranged on the arch frame beam in a one-to-one correspondence, and each limit seat is provided with a clamping piece for abutting against the arch frame beam; the support assembly includes a support beam, and support seats are arranged at both ends of the support beam, and the support seats can support the steel section and limit the position of the steel section; the abutment assembly includes an abutment frame, and the abutment frame is rotatably arranged on the support frame through a rotating shaft, and a telescopic piece is arranged at the end of the abutment frame away from the rotating shaft, and the telescopic piece is used to drive the support assembly to move in a direction close to the arch frame beam so that the steel section abuts against the arch frame beam.

[0006] Furthermore, the telescopic part includes a telescopic rod and a telescopic spring, a mounting groove is provided on the abutment frame, one end of the telescopic rod is slidably connected in the mounting groove, and the other end is detachably connected to the support seat, one end of the telescopic spring is fixedly connected to the bottom wall of the mounting groove, and the other end is fixedly connected to one end of the telescopic rod located in the mounting groove.

[0007] Furthermore, the support seat includes a base and a top seat, the base is fixedly connected to the support beam, the top seat is rotatably connected to the base, the support beam is provided with a positioning piece for fixing the position of the top seat after rotation, and the top seat includes a supporting part for supporting the steel section and a limiting part for limiting the position of the steel section.

[0008] Furthermore, an arc-shaped extension portion is provided on the limiting portion. When the telescopic spring is in the original length state, the top seat is located within the projection area of ​​the arch beam on the tunnel face, and one end of the arc-shaped extension portion away from the limiting portion extends outside the projection area of ​​the arch beam on the tunnel face.

[0009] Furthermore, the positioning member includes a positioning block and an arc-shaped spring piece. A sliding groove is provided on the support beam along its length direction. The arc-shaped spring piece is connected to the side wall of the sliding groove away from the positioning block. The positioning block is slidably arranged in the sliding groove and fixedly connected to the arc-shaped spring piece. Positioning grooves for inserting the positioning block are provided at both ends of the top seat.

[0010] Furthermore, a rotating assembly for driving the rotating shaft to rotate is provided on the support frame, and the rotating assembly includes a driving motor, a worm wheel and a worm, the worm wheel is coaxially connected to the rotating shaft, two supporting blocks are provided on the support frame, the worm is rotatably connected between the two supporting blocks and is coaxially connected to the worm wheel, the driving motor is fixedly arranged on one of the supporting blocks, and the output shaft of the driving motor is coaxially connected to the worm.

[0011] Furthermore, a vertical driving mechanism is arranged at one end of the main support facing the inside of the arch beam, and the vertical driving mechanism comprises a driving electric cylinder, and a connecting assembly for connecting with the support seat is arranged on the piston rod of the driving electric cylinder.

[0012] Furthermore, the connecting assembly includes a fixed seat and a movable seat, the fixed seat is fixedly arranged on the piston rod of the driving electric cylinder, the fixed seat is provided with an installation cavity at one end facing the outside of the arch frame beam, the movable seat is slidably arranged in the installation cavity, and a return spring is connected between the movable seat and the bottom wall of the installation cavity; a connecting rod is rotatably arranged at one end of the movable seat away from the fixed seat, the bottom end of the connecting rod is provided with an external thread, and a threaded hole matching the external thread is provided on the base.

[0013] Furthermore, the limit seat is provided with an opening portion that can be mounted on the arch beam and a baffle for sealing the opening portion, a roller is provided on the limit seat and on the side opposite to the opening portion, and the clamping member includes a screw threadedly connected to the limit seat, a rotating handle is provided at one end of the screw located outside the limit seat, and an abutment plate is provided at one end of the screw located inside the limit seat.

[0014] The present invention also provides a positioning method using a steel section welding positioning device for tunnel steel arch support, comprising the following steps:

[0015] S1. Install two limit seats on two adjacent arch beams respectively, and slide them on the arch beams to the specified position;

[0016] S2, rotating the abutment frame to a specified angle and fixing the position, installing the steel section to be welded onto the support assembly, and applying a force to the support assembly by the telescopic member to make the steel section abut against the arch beam;

[0017] S3, welding the steel section, after welding is completed, rotating the abutment frame to a specified angle, and installing the next steel section to be welded to the support assembly to facilitate welding;

[0018] S4, repeat step S3 until the welding process of multiple steel sections in the specified area is completed;

[0019] S5. Slide the limit seat to the next area to be welded along the length direction of the arch beam, fix the position of the limit seat after sliding on the arch beam by a fastening member, and continue welding the steel section in the next area.

[0020] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0021] 1. The present invention slides and installs a sliding seat on the arch beam, arranges a support frame on the sliding seat, and arranges a support assembly and an abutment assembly on the support frame. The steel section to be welded is placed on the support assembly, and the abutment assembly applies a pulling force or a pushing force to the support assembly, so that the steel section can abut against the outer side surface or the inner side surface of the arch beam to fix the position, thereby facilitating the welding of the workers.

[0022] 2. The present invention sets a telescopic assembly, and when the telescopic spring is in the original length state, the top seat is located in the projection area of ​​the arch beam on the tunnel face. When the steel section needs to be welded to the outer wall of the arch beam, the telescopic rod can pull the support seat; when the steel section needs to be welded to the inner wall of the arch beam, the telescopic rod can press the support seat, thereby realizing the positioning process of the steel section according to different welding positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the present invention will be briefly introduced below. It should be understood that the following accompanying drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the use state of the steel section welding positioning device for tunnel steel arch support of the present invention;

[0025] Figure 2 It is a schematic diagram of the overall structure of the steel section welding positioning device for tunnel steel arch support of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the limit seat of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the support assembly and the abutment assembly of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the support assembly in the initial state of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the support assembly after the top seat of the present invention rotates 180 degrees;

[0030] Figure 7 It is a schematic diagram of the structure of the support seat and the positioning member of the present invention;

[0031] Figure 8 It is a schematic diagram of the overall structure of the steel section welding positioning device when the support assembly of the present invention is installed in the vertical driving mechanism;

[0032] Fig. 9 It is a structural schematic diagram of the vertical driving mechanism of the present invention;

[0033] Icons: 1-sliding seat, 11-main support, 12-limiting seat, 121-fastening member, 1211-screw, 1212-rotating handle, 1213-abutting piece, 122-opening, 123-baffle, 124-roller, 13-vertical drive mechanism, 131-driving electric cylinder, 132-connecting assembly, 1321-fixed seat, 1322-movable seat, 1323-reset spring, 1324-connecting rod, 2-support frame, 21-rotating assembly, 211-driving motor, 2 12-worm gear, 213-worm, 214-support block, 3-support assembly, 31-support beam, 311-slide groove, 32-support seat, 321-base, 322-top seat, 3221-supporting part, 3222-limiting part, 3223-arc-shaped extension part, 3224-positioning groove, 33-positioning piece, 331-positioning block, 332-arc-shaped spring, 4-abutment assembly, 41-abutment frame, 411-rotating shaft, 42-telescopic piece, 421-telescopic rod, 422-telescopic spring. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] The following reference Figure 1-Figure 9 As shown, further described in combination with a specific embodiment, the present invention is a steel welding positioning device for tunnel steel arch support, referring to Figure 1 , Figure 2As shown, it includes a sliding seat 1, which can be detachably installed between two adjacent arch beams and can slide along the length direction of the arch beam. The sliding seat 1 includes a main support 11 and a limit seat 12 arranged at both ends of the main support 11. The two limit seats 12 are slidably arranged on the arch beam in a one-to-one manner, and each limit seat 12 is provided with a fastening member 121 for fastening to the arch beam; the main support 11 is slid along the length direction of the arch beam, and then the limit seat 12 is positioned by the fastening member 121, that is, the sliding seat 1 can be fixed as a whole at the specified position of the arch beam. A support frame 2 is arranged on one side of the sliding seat 1 facing the inside of the arch beam, and a positioning mechanism is rotatably installed on the end of the support frame 2 away from the sliding seat 1. The positioning mechanism includes a support assembly 3 for supporting the steel section to be welded and an abutment assembly 4 for driving the support assembly 3 to move toward the direction of the arch beam; the steel section to be welded is placed on the support assembly 3, and the abutment assembly 4 applies a pulling force or a pushing force to the support assembly 3, that is, the steel section can be abutted against the outer side or inner side of the arch beam, thereby facilitating the welding of the workers.

[0038] Reference Figure 2 , Figure 3 As shown, the limit seat 12 is provided with an opening portion 122 that can be mounted on the arch beam and a baffle 123 for blocking the opening portion 122. The limit seat 12 can be clamped on the arch beam by moving the baffle 123 out of the opening portion 122, and then the baffle 123 can be inserted into the opening portion 122 to block it, thereby preventing the limit seat 12 from separating from the arch beam during the sliding process. A roller 124 is provided on the limit seat 12 and on the side opposite to the opening 122 to reduce the friction force during the sliding process of the limit seat 12 and make the sliding process smoother; the clamping member 121 includes a screw 1211 threadedly connected to the limit seat 12, and a rotating handle 1212 is provided at one end of the screw 1211 located outside the limit seat 12, and an abutment plate 1213 is provided at one end of the screw 1211 located inside the limit seat 12. After the limit seat 12 is slid to the specified position, the screw 1211 is rotated by rotating the handle 1212 so that the abutment plate 1213 is pressed against the arch beam, thereby realizing the positioning effect of the limit seat 12.

[0039] Reference Figure 2 , Figure 4As shown, the support assembly 3 includes a support beam 31, and support seats 32 are provided at both ends of the support beam 31. The support seats 32 can support the steel and limit the position of the steel; the abutment assembly 4 includes an abutment frame 41, and the abutment frame 41 is rotatably arranged on the support frame 2 through a rotating shaft 411. The support frame 2 is provided with a rotating assembly 21 for driving the rotating shaft 411 to rotate, and a telescopic member 42 is provided at one end of the abutment frame 41 away from the rotating shaft 411. The telescopic member 42 is used to drive the support assembly 3 to move toward the arch beam so that the steel abuts against the arch beam. According to the position to be welded, the rotating assembly 21 is started to drive the rotating shaft 411 to rotate and maintain the position after rotation, and the steel to be welded is placed on the support seat 32. Under the pulling force or thrust of the telescopic member 42, the steel abuts against the arch beam to fix the position, so as to facilitate the staff to weld.

[0040] Reference Figure 4 As shown, the rotating assembly 21 includes a driving motor 211, a worm wheel 212 and a worm 213. The worm wheel 212 is coaxially connected to the rotating shaft 411. Two supporting blocks 214 are provided on the support frame 2. The worm 213 is rotatably connected between the two supporting blocks 214 and is coaxially connected to the worm wheel 212. The driving motor 211 is fixedly provided on one of the supporting blocks 214. The output shaft of the driving motor 211 is coaxially connected to the worm 213. When the driving motor 211 is started, the output shaft of the driving motor 211 drives the worm 213 to rotate. The worm wheel 212 drives the rotating shaft 411 to rotate under the meshing action of the worm 213, so as to drive the abutment frame 41 to rotate as a whole, thereby changing the position of the supporting assembly 3 as a whole.

[0041] Reference Figure 4 , Figure 5 As shown, the support seat 32 includes a base 321 and a top seat 322. The base 321 is welded to the support beam 31, and the top seat 322 is rotatably connected to the base 321. The support beam 31 is provided with a positioning member 33 for fixing the position of the top seat 322 after rotation. The top seat 322 includes a supporting portion 3221 for supporting the steel section and a limiting portion 3222 for limiting the position of the steel section. The telescopic member 42 includes a telescopic rod 421 and a telescopic spring 422. A mounting groove is provided on the abutment frame 41. One end of the telescopic rod 421 is slidably connected in the mounting groove, and the other end is detachably connected to the support seat 32. One end of the telescopic spring 422 is fixedly connected to the bottom wall of the mounting groove, and the other end is fixedly connected to one end of the telescopic rod 421 located in the mounting groove. Refer to Figure 5 , Figure 6As shown, when it is necessary to weld the steel section to the outside of the arch frame beam, the support beam 31 is pulled to move the top seat 322 of the support seat 32 to the outside of the arch frame beam. After the steel section is placed on the top seat 322, under the elastic force of the telescopic spring 422, the telescopic rod 421 pulls the support seat 32 in the direction close to the outer wall of the arch frame beam and makes the steel section press against the arch frame beam, thereby realizing the positioning process of the steel section; when it is necessary to weld the steel section to the inside of the arch frame beam, the top seat 322 is rotated 180° and the rotated top seat 322 is positioned by the positioning member 33, and the support beam 31 is pressed to move the support seat 32 as a whole to the inner side of the arch frame beam. After the steel section is placed on the top seat 322, under the elastic force of the telescopic spring 422, the telescopic rod 421 presses the support seat 32 in the direction close to the inner wall of the arch frame beam and makes the steel section press against the arch frame beam, thereby realizing the positioning process of the steel section.

[0042] Reference Figure 5 , Figure 7 As shown, the limiting portion 3222 is provided with an arc-shaped extension portion 3223. When the telescopic spring 422 is in the original length state, the top seat 322 is located in the projection area of ​​the arch beam on the tunnel face, and the end of the arc-shaped extension portion 3223 away from the limiting portion 3222 extends to the outside of the projection area of ​​the arch beam on the tunnel face. By providing the arc-shaped extension portion 3223, when it is necessary to place the steel section, the steel section is pressed into the arc-shaped extension portion 3223, so that the arc-shaped extension portion 3223 can drive the top seat 322 to move as a whole. The steel section can be placed on the top seat 322 without pulling or pressing the top seat 322 in advance, thereby facilitating the placement process of the steel section. After the placement is completed, the telescopic rod 421 applies tension or pressure to the support seat 32, so that the position of the steel section can be fixed, so as to facilitate the subsequent welding process.

[0043] Reference Figure 7 As shown, the positioning member 33 includes a positioning block 331 and an arc-shaped spring piece 332. A sliding groove 311 is opened on the support beam 31 along its own length direction. The arc-shaped spring piece 332 is connected to the side wall of the sliding groove 311 away from the positioning block 331. The positioning block 331 is slidably set in the sliding groove 311 and is fixedly connected to the arc-shaped spring piece 332. Positioning grooves 3224 for inserting the positioning block 331 are opened at both ends of the top seat 322. The positioning block 331 is moved away from the top seat 322 and out of the positioning groove 3224, that is, the top seat 322 can be rotated to switch the state of the top seat 322. After the top seat 322 is rotated 180°, the positioning block 331 is released, and the positioning block 331 is inserted into the aligned positioning groove 3224 under the elastic force of the arc-shaped spring piece 332, that is, the top seat 322 can be re-positioned, so that the top seat 322 can support the steel section to be welded on the inner side of the arch beam, so as to facilitate the welding of the steel section on the inner side of the arch beam.

[0044] Reference Figure 2, Figure 8 As shown, a vertical driving mechanism 13 is provided at one end of the main support 11 facing the inside of the arch beam, and the vertical driving mechanism 13 includes a driving electric cylinder 131, and a connecting assembly 132 for connecting with the support seat 32 is provided on the piston rod of the driving electric cylinder 131. When the steel section needs to be welded to the vertical part at the bottom of the arch beam, the support seat 32 is disassembled from the abutment assembly 4, and then installed to the bottom of the piston rod of the driving electric cylinder 131 through the connecting assembly 132, that is, the supporting assembly 3 can be driven to move in the vertical direction as a whole through the driving electric cylinder 131, thereby completing the positioning process of multiple steel sections in the vertical direction.

[0045] The connecting assembly 132 includes a fixed seat 1321 and a movable seat 1322. The fixed seat 1321 is fixedly set on the piston rod of the driving electric cylinder 131. The fixed seat 1321 is provided with an installation cavity at one end facing the outside of the arch beam. The movable seat 1322 is slidably set in the installation cavity. A reset spring 1323 is connected between the movable seat 1322 and the bottom wall of the installation cavity. A connecting rod 1324 is rotatably set at one end of the movable seat 1322 away from the fixed seat 1321. The bottom end of the connecting rod 1324 is provided with an external thread, and a threaded hole matching the external thread is provided on the base 321. Place the support seat 32 as a whole under the connecting assembly 132, and then thread the connecting rod 1324 onto the base 321, thereby completing the fixation of the relative position between the base 321 and the movable seat 1322. The movable seat 1322 has a tendency to move toward the direction close to the arch beam under the elastic force of the return spring 1323, thereby driving the support seat 32 to move toward the direction close to the arch beam, so that the steel section can be fixed in the vertical part at the bottom of the arch beam, facilitating the welding process.

[0046] This embodiment also provides a positioning method using a steel section welding positioning device for tunnel steel arch support, comprising the following steps:

[0047] S1, installing two limit seats 12 on two adjacent arch beams respectively, and sliding them on the arch beams to the specified position;

[0048] S2, rotating the abutment frame 41 to a specified angle and fixing the position, installing the steel section to be welded onto the support assembly 3, and applying a force to the support assembly 3 by the telescopic member 42 so that the steel section abuts against the arch beam;

[0049] S3, welding the steel section, after welding is completed, rotating the abutment frame 41 to a specified angle, and installing the next steel section to be welded to the support assembly 3 to facilitate welding;

[0050] S4, repeat step S3 until the welding process of multiple steel sections in the specified area is completed;

[0051] S5. Slide the limit seat 12 to the next area to be welded along the length direction of the arch beam, fix the position of the limit seat 12 after sliding on the arch beam by the fastening member 121, and continue welding the steel in the next area.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A steel section welding positioning device for tunnel steel arch support, characterized in that: The invention comprises a sliding seat (1), wherein the sliding seat (1) is arranged between two adjacent arch beams and can slide along the length direction of the arch beam, wherein a support frame (2) is arranged on a side of the sliding seat (1) facing the inside of the arch beam, and a positioning mechanism is rotatably arranged on an end of the support frame (2) away from the sliding seat (1), wherein the positioning mechanism comprises a supporting assembly (3) for supporting a steel section to be welded and an abutting assembly (4) for driving the supporting assembly (3) to move in a direction close to the arch beam; The sliding seat (1) comprises a main support (11) and limit seats (12) arranged at both ends of the main support (11), the two limit seats (12) are slidably arranged on the arch beam in a one-to-one correspondence, and each limit seat (12) is provided with a fastening member (121) for fastening against the arch beam; The support assembly (3) comprises a support beam (31), both ends of the support beam (31) are provided with support seats (32), and the support seats (32) are capable of supporting the profile steel and limiting the position of the profile steel; The abutment assembly (4) comprises an abutment frame (41), the abutment frame (41) being rotatably arranged on the support frame (2) via a rotating shaft (411), a telescopic member (42) being arranged at one end of the abutment frame (41) away from the rotating shaft (411), the telescopic member (42) being used to drive the support assembly (3) to move in a direction close to the arch beam so that the section steel abuts against the arch beam; The telescopic member (42) comprises a telescopic rod (421) and a telescopic spring (422); a mounting groove is provided on the abutment frame (41); one end of the telescopic rod (421) is slidably connected in the mounting groove, and the other end is detachably connected to the support seat (32); one end of the telescopic spring (422) is fixedly connected to the bottom wall of the mounting groove, and the other end is fixedly connected to one end of the telescopic rod (421) located in the mounting groove; The support seat (32) comprises a base (321) and a top seat (322), wherein the base (321) is fixedly connected to the support beam (31), and the top seat (322) is rotatably connected to the base (321), and a positioning member (33) for fixing the position of the top seat (322) after rotation is provided on the support beam (31), and the top seat (322) comprises a supporting portion (3221) for supporting a steel section and a limiting portion (3222) for limiting the position of the steel section; The limiting portion (3222) is provided with an arc-shaped extension portion (3223); when the telescopic spring (422) is in the original length state, the top seat (322) is located in the projection area of ​​the arch beam on the tunnel face, and one end of the arc-shaped extension portion (3223) away from the limiting portion (3222) extends to outside the projection area of ​​the arch beam on the tunnel face.

2. The steel section welding positioning device for tunnel steel arch support according to claim 1 is characterized in that: The positioning member (33) comprises a positioning block (331) and an arc-shaped spring piece (332); a slide groove (311) is provided on the support beam (31) along its length direction; the arc-shaped spring piece (332) is connected to a side wall of the slide groove (311) away from the positioning block (331); the positioning block (331) is slidably arranged in the slide groove (311) and is fixedly connected to the arc-shaped spring piece (332); and positioning grooves (3224) for inserting the positioning block (331) are provided at both ends of the top seat (322).

3. The steel section welding positioning device for tunnel steel arch support according to claim 1 is characterized in that: The support frame (2) is provided with a rotating assembly (21) for driving the rotating shaft (411) to rotate. The rotating assembly (21) comprises a driving motor (211), a worm wheel (212) and a worm (213). The worm wheel (212) is coaxially connected to the rotating shaft (411). The support frame (2) is provided with two supporting blocks (214). The worm (213) is rotatably connected between the two supporting blocks (214) and is coaxially connected to the worm wheel (212). The driving motor (211) is fixedly arranged on one of the supporting blocks (214). The output shaft of the driving motor (211) is coaxially connected to the worm (213).

4. The steel section welding positioning device for tunnel steel arch support according to claim 1 is characterized in that: A vertical drive mechanism (13) is provided at one end of the main support (11) facing the inside of the arch beam, and the vertical drive mechanism (13) comprises a drive electric cylinder (131), and a connecting assembly (132) for connecting to a support seat (32) is provided on the piston rod of the drive electric cylinder (131).

5. The steel section welding positioning device for tunnel steel arch support according to claim 4 is characterized in that: The connecting assembly (132) comprises a fixed seat (1321) and a movable seat (1322), wherein the fixed seat (1321) is fixedly arranged on the piston rod of the driving electric cylinder (131), an installation cavity is provided at one end of the fixed seat (1321) facing the outside of the arch frame beam, the movable seat (1322) is slidably arranged in the installation cavity, and a return spring (1323) is connected between the movable seat (1322) and the bottom wall of the installation cavity; a connecting rod (1324) is rotatably arranged at one end of the movable seat (1322) away from the fixed seat (1321), an external thread is provided at the bottom end of the connecting rod (1324), and a threaded hole matching the external thread is provided on the base (321).

6. The steel section welding positioning device for tunnel steel arch support according to claim 1 is characterized in that: The limiting seat (12) is provided with an opening portion (122) that can be sleeved on the arch beam and a baffle (123) for blocking the opening portion (122); a roller (124) is provided on the limiting seat (12) and on a side opposite to the opening portion (122); the abutting member (121) comprises a screw rod (1211) threadedly connected to the limiting seat (12); a rotating handle (1212) is provided at one end of the screw rod (1211) located outside the limiting seat (12); and an abutting sheet (1213) is provided at one end of the screw rod (1211) located inside the limiting seat (12).

7. A positioning method using the steel section welding positioning device for tunnel steel arch support according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, installing two limit seats (12) on two adjacent arch beams respectively, and sliding them on the arch beams to a specified position; S2, rotating the abutment frame (41) to a specified angle and fixing the position, installing the steel section to be welded onto the support assembly (3), and applying a force to the support assembly (3) by the telescopic member (42) so that the steel section abuts against the arch beam; S3, welding the steel section, after welding is completed, rotating the abutment frame (41) by a specified angle, and installing the next steel section to be welded to the support assembly (3) to facilitate welding; S4, repeat step S3 until the welding process of multiple steel sections in the specified area is completed; S5, slide the limit seat (12) along the length direction of the arch beam to the next area to be welded, fix the position of the limit seat (12) after sliding on the arch beam by the fastening member (121), and continue welding the steel section in the next area.

Images