Auxiliary cutting device for steel pipe arch rib concrete pouring hole

Abstract

The invention discloses an auxiliary cutting device for a steel pipe arch rib concrete pouring hole, which belongs to the technical field of bridge construction equipment and comprises a central positioning component, a driving seat component, a peripheral stabilizing component and a profiling cutting component. The center positioning assembly is fixed to the center of a preset resection area, and zero-damage rigid anchoring is achieved. The peripheral stabilizing assembly tightly holds the pipe wall to provide auxiliary support; and the driving seat drives the profiling cutting assembly to rotate. The radius and angle of the profiling cutting assembly are adjusted through a cantilever, a floating execution head abuts against the pipe wall through an elastic structure, and the distance between a nozzle and the pipe wall is kept constant through mechanical feedback. The problems that high-altitude curved-surface steel pipe trepanning positioning is difficult, and stability is poor are solved, high-precision intersecting line and groove cutting can be achieved without electric control, and the welding quality is guaranteed.

Description

Technical Field

[0001] This invention belongs to the technical field of bridge construction equipment, specifically relating to an auxiliary cutting device for concrete grouting holes in steel pipe arch ribs. Background Technology

[0002] In the construction of long-span steel-concrete composite arch bridges, the main arch ribs are typically assembled from large-diameter welded pipes. (Refer to...) Figure 1 According to the requirements of the special construction plan for cast-in-place concrete in the arch rib, after the arch rib is closed, in order to carry out the pumping operation of self-compacting micro-expansion concrete inside the pipe, process holes must be opened at specific locations on the steel pipe arch rib, including grouting holes at the bottom and grout outlet holes at the top. In order to reduce the friction resistance during concrete pumping and to conform to the flow direction, especially the grouting holes, they usually need to be opened at a specific angle (such as 45°) to the main pipe axis, and the beveling quality of the opening edges is subject to extremely high requirements to ensure that full penetration welding can be achieved when welding the grouting pipe seat later, and to withstand extremely high pumping pressure.

[0003] However, in existing construction techniques, the drilling of such high-altitude, large-diameter curved steel pipes mainly relies on manual hand-held gas cutting, which faces numerous technical challenges. First, because the surface of the arch rib is a cylindrical curved surface and is usually coated with an anti-corrosion coating, traditional magnetic adsorption bases cannot obtain sufficient adsorption force on the curved surface, making them prone to slipping or falling off during the cutting process, and it is also difficult to find and fix the center reference. Second, when cutting oblique holes on the surface of a circular pipe, the cutting trajectory is a complex spatial curve, and it is difficult for manual operation to accurately control the distance between the cutting nozzle and the pipe wall, resulting in uneven cut edges and inconsistent bevel angles. Such rough cuts will lead to excessively large gaps in the splicing seams during subsequent grouting pipe installation, making it difficult to guarantee welding quality. During high-pressure pumping of concrete, it is easy to cause serious quality and safety accidents such as pipe bursts and grout leakage due to insufficient weld strength. In addition, arch rib construction is usually carried out in a high-altitude suspended environment spanning canyons or water surfaces, resulting in high labor intensity and high safety risks for manual operation over long periods of time. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide an auxiliary cutting device for concrete grouting holes in steel pipe arch ribs, which solves the technical problem of the difficulty in opening artificial arch rib steel pipes in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The device includes a central positioning component, a drive base component, a peripheral stabilizing component, and a contour cutting component. The central positioning component is fixed at the center of a predetermined cutting area in the pipe to be drilled. The drive base component is mounted on the central positioning component and has a drive source. The peripheral stabilizing component is connected to both sides of the drive base component and is used to grip the outer wall of the pipe to provide auxiliary support. The contour cutting component is connected to the output end of the drive base component and rotates around the center. The contour cutting component includes a cantilever adjustment mechanism and a floating cutting execution head. The cantilever adjustment mechanism is used to adjust the cutting radius and cutting angle. The floating cutting execution head abuts against the outer wall of the pipe.

[0006] Optionally, the drive seat assembly includes a seat housing, a motor disposed at the top of the seat housing, a gear located inside the seat housing, and a rotary ring rotatably disposed on the seat housing; the middle of the side wall of the seat housing is recessed inward to form an annular groove, the rotary ring is rotatably disposed in the annular groove, and the outer surface of the rotary ring is flush with the outer surface of the seat housing; the inner ring of the rotary ring is provided with an internal gear ring, and the motor output shaft extends into the housing to drive the gear to mesh with the internal gear ring for transmission.

[0007] Optionally, the center positioning component includes a positioning plate, a flexible anti-slip pad disposed at the bottom of the positioning plate, and a polygonal positioning post vertically fixed to the top surface of the positioning plate; the positioning plate has a plurality of mounting holes for passing through fixing bolts, the fixing bolts being screwed into pre-drilled holes in the predetermined cut area of ​​the pipe; the bottom of the drive seat component has a countersunk hole that mates with the polygonal positioning post, and is locked and fixed by fasteners.

[0008] Optionally, the peripheral stabilizing assembly includes two sets of symmetrically arranged support units; each set of support units includes a radial connecting beam, an axial adjusting column, and an adaptive saddle; one end of the radial connecting beam is fixed to the drive seat assembly, the other end of the radial connecting beam is threadedly connected to the axial adjusting column, and the lower end of the axial adjusting column is rotatably connected to the adaptive saddle; the bottom inner side of the adaptive saddle is provided with an anti-slip rubber layer, and both ends of the adaptive saddle are respectively provided with a connecting ring and a locking stud; the peripheral stabilizing assembly also includes a flexible locking chain, one end of which is connected to the connecting ring, and the other end of which passes around the pipe and engages with the locking stud for locking.

[0009] Optionally, the cantilever adjustment mechanism includes a rotating beam fixed to the output end of the drive seat assembly, a sliding seat slidably disposed on the rotating beam, and an angle adjuster connected to the side of the sliding seat; the sliding seat is provided with a locking member for locking its position on the rotating beam; the angle adjuster includes a first gear plate and a second gear plate, the first gear plate being fixed to the sliding seat, and the second gear plate being connected to the floating cutting execution head; the opposing surfaces of the first gear plate and the second gear plate are each provided with end face meshing teeth arranged in an array around an axis, and the two are locked and engaged by a central bolt.

[0010] Optionally, the cantilever adjustment mechanism further includes a clamping block, and the second gear disk includes two coaxially arranged split disks; the clamping block is disposed on the outer side of the second gear disk; the clamping block includes two tightening blocks, which are respectively fixedly connected to the sides of the two split disks; a shrinkage gap is formed between the two tightening blocks, configured to synchronously shrink and clamp the floating cutting execution head as the split disks perform axial locking action.

[0011] Optionally, the floating cutting actuator further includes a guide cylinder, a cutting torch body, and a spring; the vertical axis of the cutting torch body passes through the guide cylinder and can slide axially; the spring is disposed between the vertical axis and the guide cylinder and is configured to always apply a thrust toward the pipe surface to the cutting torch body.

[0012] Optionally, the floating cutting actuator further includes a contouring link and a follower abutment; one end of the contouring link is fixed above the nozzle of the cutting torch body, and the other end of the contouring link extends to the side and is provided with a threaded hole; the follower abutment is threaded into the threaded hole to adjust the vertical height, and the bottom end of the follower abutment is inlaid with a rotatable universal ball, which is used to abut and roll on the outer wall of the pipe.

[0013] Optionally, the bottom edge of the base housing is provided with a chamfered structure; the chamfered structure is configured to provide clearance space for the cutting torch body when the contour cutting assembly tilts inward to cut the bevel.

[0014] Optionally, the positioning plate is a rigid metal plate, the flexible anti-slip pad is bonded to the lower surface of the positioning plate, and the positioning plate and the flexible anti-slip pad are provided with through holes for the fixing bolts to pass through at corresponding positions; the polygonal positioning post is a regular hexagonal prism, and the top of the polygonal positioning post is provided with an internal threaded hole for connecting the drive seat assembly.

[0015] The beneficial effects of this invention are as follows: 1. By fixing the central positioning component to the center of the "pre-determined cut area" of the pipe, anchoring is achieved using the waste area. This not only provides physical connection stiffness far exceeding that of magnetic or vacuum adsorption, ensuring that the device does not shift or slip during high-altitude operations, but also removes the positioning point along with the waste after cutting, avoiding damage to the remaining arch rib parent material.

[0016] 2. The floating cutting head in the contour cutting assembly is designed to abut against the outer wall of the pipe. During the rotary cutting process, the floating head can mechanically follow the curvature fluctuations or roundness errors of the pipe surface to adaptively adjust, ensuring that the relative distance between the cutting nozzle and the pipe wall remains constant, thus cutting out intersecting holes with precise trajectories and smooth edges.

[0017] 3. The outer stabilizing components tightly grip the outer wall of the pipe, forming a composite support structure of "central anchoring + outer auxiliary" in conjunction with the central positioning components. This multi-point support method effectively overcomes the overturning moment generated by cantilever cutting and the influence of high-altitude wind loads, significantly improving the stability of the device when operating on the side of large-diameter steel pipes.

[0018] 4. The cantilever adjustment mechanism supports the adjustment of the cutting radius and cutting angle, enabling the device to adapt to the design requirements of different hole diameters and the process requirements of different welding bevel angles, making it highly versatile.

[0019] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the arch rib structure of the bridge; Figure 2 A schematic diagram of the overall structure of the auxiliary cutting device according to an embodiment of the invention; Figure 3 Detailed structural diagrams of the central positioning component and the drive seat component in this invention embodiment; Figure 4 Detailed structural diagram of the peripheral stabilizing component of this invention embodiment; Figure 5 Detailed structural diagram of the contour cutting component of this invention embodiment; Figure 6 A cross-sectional view of the torch body cut in this embodiment of the invention; The following markings are shown in the attached diagram: 21. Positioning plate; 22. Flexible anti-slip pad; 23. Polygonal positioning post; 25. Fixing bolt; 31. Seat housing; 33. Annular groove; 36. Motor; 37. Gear; 38. Rotary ring; 39. Internal gear ring; 41. Radial connecting beam; 42. Adaptive saddle; 43. Anti-slip rubber layer; 44. Connecting ring; 45. Locking stud; 46. Flexible locking chain; 47. Axial adjusting post; 51. Rotary... 52. Moving crossbeam; 53. Sliding seat; 541. Locking element; 542. First gear plate; 543. Second gear plate; 544. Split disc; 545. End face meshing teeth; 546. Shaft bolt; 55. Clamping block; 567. Tightening block; 568. Contraction gap; 569. Guide cylinder column; 560. Vertical shaft; 561. Nozzle; 562. Spring; 563. Contouring connecting rod; 564. Follower abutment rod; 565. Universal ball bearing. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0022] Please see Figure 1-6 It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0023] The following embodiments are for illustrative purposes only. These embodiments can be combined and are not limited to the content shown in any single embodiment below.

[0024] This invention provides an auxiliary cutting device for concrete grouting holes in steel pipe arch ribs, such as... Figure 2As shown, this invention provides an auxiliary cutting device for concrete pouring holes in steel pipe arch ribs. Its core design concept lies in solving the technical bottlenecks encountered in the construction of large-span bridges, such as positioning difficulties, contouring difficulties, and poor beveling accuracy when drilling large-diameter steel pipes at suspended heights. The device's mechanical structure is organically coupled with four core modules: a central positioning component, a drive seat component, an outer stabilizing component, and a contouring cutting component. This forms an automated construction equipment with rigid reference, flexible clamping, internal drive, and mechanical contouring characteristics. Figure 3 As shown, firstly, the central positioning component serves as the spatial coordinate reference for the entire machine. Its main body is a high-strength positioning plate 21, which is typically made of alloy steel through precision grinding to ensure that it does not bend or deform under high torque conditions. On the bottom surface of the positioning plate 21, a flexible anti-slip pad 22 is hot-pressed and bonded using high-strength industrial structural adhesive. This anti-slip pad is preferably made of oil-resistant polyurethane rubber sheet, with a diamond-shaped anti-slip texture pressed onto its surface. The flexible anti-slip pad 22 has a dual function: on the one hand, it utilizes the high coefficient of friction of the rubber material to significantly increase the static friction between the base and the anti-corrosion coating of the steel pipe, preventing the device from rotating; on the other hand, it can effectively adapt to the curved structure of the steel pipe and fill the microscopic unevenness on the surface of the steel pipe, achieving surface contact. At the geometric center of the positioning plate 21, a polygonal positioning post 23 is vertically welded. In this embodiment, this positioning post is specifically designed as a regular hexagonal prism structure. The geometric properties of a regular hexagonal prism give it natural resistance to torsion, allowing it to withstand the circumferential reaction torque generated during the cutting process when the drive unit assembly is fitted onto it. Two mounting holes are symmetrically provided on the positioning plate 21 and the anti-slip pad, which, together with high-strength fixing bolts 25, are used to lock the device within the "pre-determined cutting area" of the pipe.

[0025] like Figure 3As shown, the drive seat assembly is mounted on the central positioning assembly. Its main body is an aluminum alloy cast housing 31. A hexagonal countersunk hole, precisely fitting the aforementioned regular hexagonal prism, is machined at the bottom center of the housing, and axial locking is achieved through a top cap and fasteners. A deep, recessed T-shaped annular groove 33 is machined inwards in the middle of the side wall of the housing 31. The slewing ring 38 is rotatably mounted within this annular groove 33 via a sliding bearing structure. To adapt to harsh field conditions, the outer surface of the slewing ring 38 is designed to be strictly flush with the outer surface of the housing 31. This streamlined, "stepless" appearance design reduces dead angles for the accumulation of cutting slag and dust. An internal gear ring 39 is machined on the inner circumferential surface of the slewing ring 38 in the internal drive chain. A DC geared motor 36 is mounted on the top flange of the housing 31. The motor 36 shaft extends into the sealed cavity inside the housing, driving a gear 37 to mesh with the internal gear ring 39. This fully enclosed internal gear transmission design is used to prevent the risk of external iron filings jamming the gear 37. In addition, the bottom edge of the housing 31 is cut with a large-angle chamfer structure of 45° to 60°. This geometric feature is such that when the cutting torch is tilted inward to cut the V-shaped bevel, the tail of the torch will contract inward. The chamfer structure provides the necessary clearance to prevent mechanical interference.

[0026] like Figure 4 As shown, the peripheral stabilizing components are connected to both sides of the drive seat assembly, forming a stable support system. This includes two symmetrical radial connecting beams 41 welded to the seat housing 31, the beams being rectangular steel tubes. An axial adjustment column 47 is introduced at the end of the connecting beams. The upper end of the axial adjustment column 47 is screwed into the end screw hole of the radial connecting beam 41 via a threaded structure. By rotating the axial adjustment column 47, the height of the support point relative to the base can be finely adjusted. An adaptive saddle 42 is rotatably connected to the lower end of the axial adjustment column 47. The bottom of the saddle is concave and covered with an anti-slip rubber layer 43. This structure allows the saddle to adapt to curvatures of different pipe diameters and, when the steel pipe surface is not round or has local depressions, the levelness of the device can be corrected by extending and retracting the adjustment column. Connecting rings 44 and locking studs 45 are respectively provided on both sides of the saddle, in conjunction with a high-strength flexible locking chain 46. The chain wraps around the pipe, pulling the two saddles downwards like a belt, thereby eliminating vibration at the cantilever end.

[0027] like Figure 5As shown, the contour cutting assembly, serving as the execution end, is connected to the output end of the rotary ring 38. It includes a cantilever adjustment mechanism and a floating cutting execution head. The cantilever adjustment mechanism consists of a rotating crossbeam 51 fixed to the rotary ring 38 and a sliding seat 52 on it, with the sliding seat 52 locked in position by a locking member 53. An angle adjuster is connected to the side of the sliding seat 52, which consists of a first gear disc 541 and a second gear disc 542, with high-precision radial end-face meshing teeth 544 machined on their contact surfaces. The second gear disc 542 adopts a split disc 5421 structure, consisting of two coaxially arranged disc units. The clamping block 55 fixed to the outside of the second gear disc 542 is correspondingly divided into two tightening blocks 551, which are welded to the two split discs 5421 respectively, leaving a shrinkage gap 552 in the middle. When the central pivot bolt 545 is tightened, the axial force simultaneously performs two actions: first, it forces the end face teeth to mesh and lock the angle; second, it forces the split disc 5421 to move closer together, thereby driving the tightening block 551 to close and clamp the floating cutting actuator head inserted therein. The floating cutting actuator head includes a guide cylinder 561, a cutting torch body inserted therein, a spring 565, and an anti-rotation mechanism. The vertical shaft 563 of the cutting torch body is inserted into the guide cylinder 561 and can slide axially. The spring 565 is located between the vertical shaft 563 and the guide cylinder 561 and is configured to always apply a thrust toward the pipe surface to the cutting torch body. A contoured connecting rod 566 is fixed above the torch nozzle 564. A follower abutment 567 is threaded to the side end of the connecting rod, and a high-temperature resistant universal ball bearing 568 is embedded at the bottom end of the abutment. This structure ensures that during the cutting process, the ball bearings always adhere to the pipe wall regardless of the undulations of the steel pipe surface. Through the expansion and contraction compensation of the spring 565, the distance between the nozzle 564 and the pipe wall is forced to remain constant.

[0028] The specific steps of the actual construction operation of this device are as follows: First, technicians need to accurately measure and mark the center coordinates of the grouting hole on the surface of the arch rib steel pipe according to the design drawings, and draw the estimated opening outline with a stone pencil. Two threaded bottom holes are symmetrically drilled around the center, and internal threaded holes are formed by tapping. The distance between these two holes must be strictly consistent with the distance between the mounting holes on the center positioning plate 21. Clean the welding slag and oil around the hole opening to ensure a smooth surface. Align the positioning plate 21 of the center positioning component with the pre-drilled hole, and ensure the bottom flexible anti-slip pad 22 is tightly against the pipe wall. Use a torque wrench to screw the two high-strength fixing bolts 25 into the bolt holes of the steel pipe. This compresses and deforms the rubber pad, ensuring an extremely rigid connection between the base and the steel pipe, eliminating any shaking gaps. At this point, the hexagonal positioning post is perpendicular to the pipe wall, thus establishing the physical coordinate system of the entire machine. Align the bottom hexagonal countersunk hole of the drive seat component with the positioning post and insert it. Due to the use of a hexagonal fit, circumferential positioning is achieved upon insertion. Screw in the clamping bolt and washer at the top of the positioning column to lock the drive seat in place. Expand the radial connecting beams 41 on both sides. The operator rotates the axial adjusting column 47 to extend or shorten the vertical height of the saddle until both saddles are smoothly in contact with the pipe wall. Next, hook one end of the flexible locking chain 46 onto the connecting ring 44, and loop the other end around the back of the steel pipe, hooking it onto the hook of the locking stud 45. Tighten the nut with a wrench. As the chain tensions, the saddles on both sides generate enormous centripetal pressure, forming an extremely stable support structure together with the central base. Loosen the locking element 53 on the cantilever, move the sliding seat 52, aligning the center of the cutting nozzle 564 with the opening radius line. After confirming this, lock the sliding seat 52. Rotate the follower abutment 567 to adjust its extension length. Observe the position of the universal ball bearing 568. Stop adjusting when the ball bearing contacts the pipe wall and lifts the torch, and the spring 565 is in its compressed stroke. At this point, measure the distance between nozzle 564 and the pipe wall, and fine-tune the abutment until the distance stabilizes at a suitable flame cutting height; connect the oxygen and acetylene hoses and the power cord of motor 36. To prevent the pipeline from being pulled apart during 360° rotation, a "reverse pre-winding" operation must be performed before starting the machine. That is, rotate the rotary ring 38 one revolution in the opposite direction so that the pipeline is in a state of being wound around the base once, open the gas valve, ignite the torch, and start motor 36 to rotate forward. When the device has rotated about 370 degrees (more than one revolution to ensure that the beginning and end overlap and cut), close the cutting oxygen and gas valves, stop motor 36, loosen the nut of flexible locking chain 46, and remove the chain; use a wrench to loosen the two fixing bolts 25 on the center positioning plate 21. The cut circular steel scrap is still connected to the center positioning component. The operator only needs to hold the device handle to remove the "cutting device + circular scrap" as a whole from the arch rib steel pipe.

[0029] This invention utilizes the "waste area to be removed" as an anchor point, directly connected by bolts, achieving physical-level rigid fixation. This fixing method is not only low-cost but also has extremely high connection strength, capable of withstanding strong winds and cutting reaction forces. Furthermore, the waste material is removed after cutting, avoiding damage to the remaining main arch rib.

[0030] In traditional tooling, adjusting the angle and height usually requires operating two different locking mechanisms, making high-altitude operations cumbersome and prone to errors. The present invention designs a split-type second gear disc 542, in conjunction with a split-type tightening block 551, utilizing the axial tightening force of a single central bolt 545 to simultaneously achieve both "angle engagement of the end face teeth" and "radial clamping of the disc's contraction." This "one bolt, two locks" linkage logic shortens adjustment time, and the engagement of the end face teeth ensures that the angle will not shift even under severe vibration.

[0031] This invention employs a mechanical contouring structure consisting of a spring (565) and a universal ball bearing (568). The ball bearing directly contacts the pipe wall, resulting in a zero-delay response and strong anti-interference capability. This structure ensures that the distance between the torch and the pipe wall remains constant, thus enabling the cutting of precisely trajectories and smooth-edged intersecting holes.

[0032] The axial adjustment column 47 design gives the device tolerance to surface roundness errors of the steel pipe. Combined with the flexible locking chain 46, the device can adapt to a wide range of pipe diameter changes, and can achieve stable installation through the triangular support system for horizontal, vertical, and inclined pipes.

[0033] By concealing the gear 37 and internal gear ring 39 within the enclosed cavity formed by the housing 31 and the rotating ring 38, and with a flush outer design, this device constructs a labyrinthine dustproof structure. This effectively prevents ubiquitous molten iron oxide slag and splashed metal from intruding into the transmission system during cutting operations, greatly extending the equipment's service life and reducing maintenance frequency.

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. An auxiliary cutting device for concrete pouring holes in steel pipe arch ribs, characterized in that: The device includes a central positioning component, a drive base component, a peripheral stabilizing component, and a contour cutting component. The central positioning component is fixed at the center of a predetermined cutting area in the pipe to be drilled. The drive base component is mounted on the central positioning component and has a drive source. The peripheral stabilizing component is connected to both sides of the drive base component and is used to grip the outer wall of the pipe to provide auxiliary support. The contour cutting component is connected to the output end of the drive base component and rotates around the center. The contour cutting component includes a cantilever adjustment mechanism and a floating cutting execution head. The cantilever adjustment mechanism is used to adjust the cutting radius and cutting angle. The floating cutting execution head abuts against the outer wall of the pipe.

2. The auxiliary cutting device for concrete grouting holes in steel pipe arch ribs according to claim 1, characterized in that: The drive seat assembly includes a seat housing (31), a motor (36) disposed at the top of the seat housing (31), a gear (37) located inside the seat housing (31), and a rotating ring (38) rotatably disposed on the seat housing (31); the middle of the side wall of the seat housing (31) is recessed inward to form an annular groove (33), the rotating ring (38) is rotatably disposed in the annular groove (33), and the outer side of the rotating ring (38) is flush with the outer side of the seat housing (31); the inner ring of the rotating ring (38) is provided with an internal gear ring (39), and the output shaft of the motor (36) extends into the housing to drive the gear (37) to mesh with the internal gear ring (39) for transmission.

3. The auxiliary cutting device for concrete pouring holes in steel pipe arch ribs according to claim 1, characterized in that: The central positioning component includes a positioning plate (21), a flexible anti-slip pad (22) disposed at the bottom of the positioning plate (21), and a polygonal positioning post (23) vertically fixed to the top surface of the positioning plate (21). The positioning plate (21) has several mounting holes for passing through fixing bolts (25), which are used to be screwed into pre-made holes in the predetermined cut area of ​​the pipe. The bottom of the drive seat component has a countersunk hole that mates with the polygonal positioning post (23) and is locked and fixed by fasteners.

4. The auxiliary cutting device for concrete pouring holes in steel pipe arch ribs according to claim 1, characterized in that: The peripheral stabilizing assembly includes two sets of symmetrically arranged support units; each set of support units includes a radial connecting beam (41), an axial adjusting column (47), and an adaptive saddle (42); one end of the radial connecting beam (41) is fixed to the drive seat assembly, the other end of the radial connecting beam (41) is threadedly connected to the axial adjusting column (47), and the lower end of the axial adjusting column (47) is rotatably connected to the adaptive saddle (42); the bottom inner side of the adaptive saddle (42) is provided with an anti-slip rubber layer (43), and the two ends of the adaptive saddle (42) are respectively provided with a connecting ring (44) and a locking stud (45); the peripheral stabilizing assembly also includes a flexible locking chain (46), one end of the flexible locking chain (46) is connected to the connecting ring (44), and the other end of the flexible locking chain (46) passes around the pipe and is locked with the locking stud (45).

5. The auxiliary cutting device for concrete grouting holes in steel pipe arch ribs according to claim 1, characterized in that: The cantilever adjustment mechanism includes a rotating beam (51) fixed to the output end of the drive seat assembly, a sliding seat (52) slidably disposed on the rotating beam (51), and an angle adjuster connected to the side of the sliding seat (52); the sliding seat (52) is provided with a locking member (53) for locking its position on the rotating beam (51); the angle adjuster includes a first toothed disc (541) and a second toothed disc (542), the first toothed disc (541) is fixed to the sliding seat (52), and the second toothed disc (542) is connected to the floating cutting execution head; the opposing surfaces of the first toothed disc (541) and the second toothed disc (542) are provided with end face meshing teeth (544) arranged in an array around the axis, and the two are locked and engaged by a central bolt (545).

6. The auxiliary cutting device for concrete pouring holes in steel pipe arch ribs according to claim 5, characterized in that: The cantilever adjustment mechanism further includes a clamping block (55). The second gear disc (542) includes two coaxially arranged split discs (5421). The clamping block (55) is located on the outside of the second gear disc (542). The clamping block (55) includes two tightening blocks (551). The two tightening blocks (551) are respectively fixedly connected to the sides of the two split discs (5421). A shrinkage gap (552) is formed between the two tightening blocks (551), which is configured to synchronously shrink and clamp the floating cutting execution head as the split discs (5421) perform axial locking action.

7. The auxiliary cutting device for concrete pouring holes in steel pipe arch ribs according to claim 6, characterized in that: The floating cutting execution head also includes a guide cylinder (561), a cutting torch body, and a spring (565); the vertical shaft (563) of the cutting torch body passes through the guide cylinder (561) and can slide axially; the spring (565) is disposed between the vertical shaft (563) and the guide cylinder (561) and is configured to always apply a thrust toward the pipe surface to the cutting torch body.

8. The auxiliary cutting device for concrete pouring holes in steel pipe arch ribs according to claim 7, characterized in that: The floating cutting actuator also includes a contouring link (566) and a follower abutment (567); one end of the contouring link (566) is fixed above the nozzle (564) of the cutting torch body, and the other end of the contouring link (566) extends to the side and is provided with a threaded hole; the follower abutment (567) is threaded into the threaded hole to adjust the height, and the bottom end of the follower abutment (567) is inlaid with a rotatable universal ball (568), which is used to abut and roll on the outer wall of the pipe.

9. The auxiliary cutting device for concrete grouting holes in steel pipe arch ribs according to claim 8, characterized in that: The bottom edge of the base housing (31) is provided with a chamfered structure; the chamfered structure is configured to provide clearance space for the cutting torch body when the contour cutting assembly tilts inward to cut the bevel.

10. The auxiliary cutting device for concrete pouring holes in steel pipe arch ribs according to claim 3, characterized in that: The positioning plate (21) is a rigid metal plate, the flexible anti-slip pad (22) is bonded to the lower surface of the positioning plate (21), and the positioning plate (21) and the flexible anti-slip pad (22) are provided with through holes for the fixing bolt (25) to pass through at corresponding positions; the polygonal positioning post (23) is a regular hexagonal prism, and the top of the polygonal positioning post (23) is provided with an internal threaded hole for connecting the drive seat assembly.

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