A tunnel steel arch support device

Abstract

The application discloses a tunnel steel arch support device, which comprises two vehicle bodies, arc-shaped connecting rods, connecting fixed shafts, rotating sleeves, rotating lifting rods, lifting positioning systems, driving assemblies and steel arches; the vehicle bodies adopt a half-vehicle-body splicing structure and are provided with walking driving assemblies controlled synchronously; the rotating lifting rods are driven by synchronous lifting driving motors to realize synchronous lifting with the rotating sleeves as fulcrums; the lifting positioning systems are combined with sliding fit and air pressure jacking structures to realize accurate positioning and height fine adjustment of the steel arches; and the steel arches adopt a detachable splicing design, and the bolt fixation guarantees the support strength and contour precision. The device has a reasonable structure and is convenient to operate, effectively improves the installation efficiency and positioning precision of the steel arch support, reduces the labor intensity in construction, and effectively improves the safety of tunnel support construction in soft soil and soft and weak surrounding rock.

Description

Technical Field

[0001] This invention relates to the field of tunnel engineering surrounding rock support technology, specifically to a tunnel steel arch support device. Background Technology

[0002] In tunnel construction under geological conditions such as soft soil and weak surrounding rock, the surrounding rock has poor self-stabilizing ability and is prone to settlement and collapse, requiring high timeliness, integrity, and stability of the initial support. Traditional tunnel support usually involves the step-by-step installation of steel arch frames by combining manual labor with machinery, which has problems such as fragmented processes, low degree of automation, slow construction efficiency, poor support accuracy, and insufficient operational safety.

[0003] The existing steel pipe-H-type steel arch tunnel support structure disclosed in CN113653515B only focuses on improving the overall strength and impact resistance of the arch frame itself. It does not achieve synchronous transportation, overall lifting, precise alignment and on-site mechanized integrated assembly of the three-section steel arch frame, which is difficult to meet the actual construction needs of rapid, safe and efficient support for soft rock tunnels.

[0004] To address the shortcomings of existing technologies, this invention provides a tunnel steel arch support device that enables mechanized transportation, synchronous lifting, precise alignment, and rapid assembly of the steel arch, simplifying construction procedures and significantly improving support efficiency and construction safety. Summary of the Invention

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a tunnel steel arch support device, comprising a vehicle body, an arc-shaped connecting rod, a connecting fixed shaft, a rotating sleeve, a positioning pin, a rotating lifting rod, a lifting positioning system, a lifting drive motor, a motor output shaft, a motor gear, a lifting rod driven gear, a steel arch, a synchronous controller, and a walking drive mechanism.

[0006] The rotating lifting rod includes rotating lifting rod A, rotating lifting rod B, sliding rod, fixed rod A, and fixed rod B; the lifting positioning system includes a transverse support rod, sliding groove, pneumatic rod, jacking rod, lifting positioning platform, fixed rod C, and sliding stroke limit block; the steel arch frame is assembled from steel arch frame A, steel arch frame B, and steel arch frame C in sections by connecting flanges, and the connecting flange includes bolt holes, a convex positioning stop, and a concave positioning stop.

[0007] Two vehicles are installed, symmetrically arranged on the left and right sides of the tunnel, with each vehicle arranged longitudinally along the tunnel. Each vehicle is assembled from half-body A and half-body B, which are detachably and fixedly connected by a connecting shaft and a positioning pin. The connecting shaft is hinged to both half-body A and half-body B. Driven wheels are installed at the bottom of half-body A, and driven wheels are installed at the bottom of half-body B. The driven wheels and driven wheels have the same diameter, and the driving mechanism is coaxially and fixedly connected to the driven wheels.

[0008] Two arc-shaped connecting rods are installed. The two arc-shaped connecting rods span across the tunnel between the two vehicle bodies, and their arc-shaped contours are adapted to the contours of the tunnel bottom on both sides. One arc-shaped connecting rod is fixedly connected to the top surface of half-body A of the two vehicle bodies at both ends, and the other arc-shaped connecting rod is fixedly connected to the top surface of half-body B of the two vehicle bodies at both ends. A synchronization controller is fixedly installed on the top of the arc-shaped connecting rods.

[0009] Each vehicle body has a rotating sleeve fitted on the outer side of its corresponding connecting and fixing shaft. The rotating sleeve and the connecting and fixing shaft are clearance-fitted, and an axial limiting structure is provided between the rotating sleeve and the connecting and fixing shaft. The axial limiting structure consists of limiting retaining rings fitted on both ends of the connecting and fixing shaft to limit the axial movement of the rotating sleeve. A lifting rod driven gear is fixedly connected to each side of the rotating sleeve by a flat key. The outer side of the rotating sleeve is welded and fixed to the rotating lifting rod A and rotating lifting rod B. The lifting rod driven gear, the connecting and fixing shaft, and the rotating sleeve are arranged coaxially. The connecting and fixing shaft serves as the rotation fulcrum for the rotating lifting rod A and rotating lifting rod B.

[0010] Each half-body A and half-body B of each vehicle is fixedly equipped with a lifting drive motor with a mounting bracket on the inner wall of the side closest to the center of the tunnel. The mounting bracket is detachably fixed to half-body A and half-body B by bolts. The output end of the lifting drive motor is fixed coaxially with the motor output shaft, and a motor gear is fixed coaxially on the motor output shaft. The motor gear on the same side meshes with the driven gear of the corresponding lifting rod. The two lifting drive motors on each vehicle synchronously drive the rotating lifting rod A and rotating lifting rod B to rotate and lift around the fixed shaft. Both lifting drive motors are electrically connected to a synchronous controller, which uniformly controls the speed and direction to achieve synchronous lifting of the mechanism.

[0011] Sliding rods are horizontally fixed on both rotating lifting rod A and rotating lifting rod B. Fixed rods A and B are vertically fixed at the top of rotating lifting rod A and rotating lifting rod B, respectively. A transverse support rod is erected between rotating lifting rod A and rotating lifting rod B along the transverse direction of the tunnel. Two sets of symmetrical sliding grooves are opened in the middle of the transverse support rod. The sliding rod is slidably embedded in the sliding groove. A guide key is provided between the sliding groove and the sliding rod to realize sliding guidance. A sliding stroke limit block is fixed in the sliding groove to limit the sliding stroke of the sliding rod.

[0012] Four sets of pneumatic rods are vertically fixed on the top surface of the horizontal support rod. The four sets of pneumatic rods are arranged symmetrically in a rectangle. The telescopic ends of the pneumatic rods are fixedly connected to the lifting rod. The top of the lifting rod is fixedly connected to the lifting and positioning platform. A fixed rod C is vertically fixed on the top surface of the lifting and positioning platform. The top of the fixed rod C is detachably fixed to the steel arch frame C by bolts. The telescopic movement of the pneumatic rods can drive the lifting rod, the lifting and positioning platform, and the steel arch frame C to rise and fall synchronously. The tops of the fixed rods A and B are detachably fixed to the steel arch frames A and B by bolts, respectively.

[0013] The joint ends of steel arch frames A, B, and C are all equipped with joint flanges, which are integrally formed with the ends of the steel arch frames. Four bolt holes of the same specification are symmetrically opened on the joint flanges, and high-strength bolts are adapted to pass through the bolt holes. Each section of the steel arch frame can be disassembled and assembled into a whole structure by means of high-strength bolts. The mating surfaces of the joint flanges are equipped with matching convex positioning stops and concave positioning stops. The convex positioning stops are rectangular bosses, and the concave positioning stops are grooves adapted to the rectangular bosses. The two fit together to achieve rapid alignment and limit and prevent wrong assembly when assembling the steel arch frame sections. Beneficial effects

[0014] Compared with the prior art, the present invention has the following beneficial effects.

[0015] The dual-vehicle symmetrical synchronous walking layout replaces the traditional manual handling and lifting of steel arch frames, significantly reducing the labor intensity of on-site construction personnel and effectively shortening the steel arch frame support and installation period.

[0016] The device has a compact overall structure and adopts synchronous motor control, sliding guidance and limit protection design, so the whole machine runs smoothly and reliably. The steel arch frame adopts a three-section split assembly structure, and the various components of the equipment are modular and detachable, which facilitates off-site transportation and on-site assembly and maintenance. It can be adapted to the support construction of tunnels with different cross-sectional sizes, and its versatility and construction safety are greatly improved.

[0017] By using gear meshing rotation lifting combined with pneumatic jacking fine-tuning structure, the steel arch frame can be adjusted at multiple angles and aligned with high precision, ensuring the assembly contour accuracy and overall support rigidity of the steel arch frame, and adapting to the rapid support construction needs of tunnels in soft soil and weak surrounding rock. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is the front view of the present invention.

[0020] Figure 2 This is a top view of the present invention.

[0021] Figure 3 This is a side view of the steel arch frame of the present invention in its non-working state.

[0022] Figure 4 for Figure 3 Top view.

[0023] Figure 5 This is a diagram showing the working state of the steel arch frame A and steel arch frame B of the present invention.

[0024] Figure 6 for Figure 5 Top view.

[0025] Figure 7 This is a diagram showing the working state of the steel arch support of the present invention.

[0026] Figure 8 for Figure 7 Top view.

[0027] Figure 9 Main view of the flange convex positioning stop.

[0028] Figure 10 Main view of the recessed locating stop of the mating flange.

[0029] Figure 11 Side view of the flange convex and concave positioning stop.

[0030] Marked in the image: 1. Car body; 11. Half-car body A; 12. Half-car body B; 13. Driven wheels; 14. Driven wheels; 15. Synchronization controller; 2. Arc-shaped connecting rod; 3. Connecting and fixing the shaft; 31. Rotating sleeve; 32. Locating pin; 4. Rotate the lifting rod; 41. Rotate the lifting rod A; 42. Rotate the lifting rod B; 43. Sliding rod; 44. Fixed rod A; 45. Fixed rod B; 5. Lifting and positioning system; 51. Lateral support rod; 52. Sliding groove; 53. Pneumatic rod; 54. Lifting rod; 55. Lifting and positioning platform; 56. Fixed rod C; 57. Sliding stroke limit block; 6. Lifting drive motor; 7. Motor output shaft; 8. Motor gear; 9. Lifting rod driven gear; 10. Steel arch frame; 101. Steel arch frame A; 102. Steel arch frame B; 103. Steel arch frame C; 104. Butt flange; 105. Bolt hole; 106. High-strength bolt; 107. Raised positioning stop; 108. Recessed positioning stop. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] like Figure 1-11 As shown, this embodiment provides a tunnel steel arch support device, including a vehicle body 1, an arc-shaped connecting rod 2, a connecting fixed shaft 3, a rotating sleeve 31, a positioning pin 32, a rotating lifting rod 4, a lifting positioning system 5, a lifting drive motor 6, a motor output shaft 7, a motor gear 8, a lifting rod driven gear 9, a steel arch frame 10, a synchronous controller 15, and a walking drive mechanism.

[0033] The rotating lifting rod 4 includes a rotating lifting rod A41, a rotating lifting rod B42, a sliding rod 43, a fixed rod A44, and a fixed rod B45; the lifting positioning system 5 includes a transverse support rod 51, a sliding groove 52, a pneumatic rod 53, a lifting rod 54, a lifting positioning platform 55, a fixed rod C56, and a sliding stroke limit block 57; the steel arch frame 10 is assembled from steel arch frames A101, B102, and C103 in sections via a connecting flange 104, the connecting flange 104 including bolt holes 105, a convex positioning stop 107, and a concave positioning stop 108.

[0034] Two vehicle bodies 1 are provided, symmetrically arranged on the left and right sides of the tunnel, with each vehicle body 1 arranged longitudinally along the tunnel. Each vehicle body 1 is assembled from half-body A11 and half-body B12. Half-body A11 and half-body B12 are detachably and fixedly connected by a connecting fixed shaft 3 and a positioning pin 32, and the connecting fixed shaft 3 is hinged to both half-body A11 and half-body B12. Half-body A11 is provided with a driven wheel 13 at its lower part, and half-body B12 is provided with a driven wheel 14 at its lower part. The driven wheel 13 and the driven wheel 14 have the same wheel diameter, and the walking drive mechanism is coaxially and fixedly connected to the driven wheel 14.

[0035] Two arc-shaped connecting rods 2 are provided. The two arc-shaped connecting rods 2 span across the tunnel between the two vehicle bodies 1, and their arc-shaped contours are adapted to the contours of the tunnel bottom sides. The two ends of one arc-shaped connecting rod 2 are fixedly connected to the top surface of half-body A11 of the two vehicle bodies 1, and the two ends of the other arc-shaped connecting rod 2 are fixedly connected to the top surface of half-body B12 of the two vehicle bodies 1. A synchronous controller 15 is fixedly installed on the top of the arc-shaped connecting rod 2.

[0036] Each vehicle body 1 has a rotating sleeve 31 fitted on the outer side of the connecting fixed shaft 3. The rotating sleeve 31 and the connecting fixed shaft 3 are fitted with a clearance fit. An axial limiting retaining ring is provided between the rotating sleeve 31 and the connecting fixed shaft 3 to limit the axial displacement of the rotating sleeve 31. A lifting rod driven gear 9 is fixedly connected to each side of the rotating sleeve 31 by a flat key. The outer side of the rotating sleeve 31 is welded and fixed to the rotating lifting rod A41 and the rotating lifting rod B42. The lifting rod driven gear 9, the connecting fixed shaft 3 and the rotating sleeve 31 are arranged coaxially.

[0037] The inner sidewalls of half-body A11 and half-body B12 of each vehicle body 1, which are close to the center of the tunnel, are all equipped with lifting drive motors 6 by mounting brackets. The output end of the lifting drive motor 6 is connected to the motor output shaft 7, and the motor output shaft 7 is fixed with a motor gear 8. The motor gear 8 meshes with the driven gear 9 of the lifting rod on the same side for transmission. The lifting drive motor 6 is uniformly controlled by the synchronous controller 15 to realize the synchronous rotation and lifting of the rotating lifting rod.

[0038] Sliding rods 43 are horizontally fixed on both rotating lifting rods A41 and B42. A transverse support rod 51 is erected between the two rotating lifting rods. The sliding rods 43 are slidably assembled in the sliding groove 52 and are equipped with guide keys and stroke limit blocks 57. Four sets of pneumatic rods 53 are provided on the transverse support rod 51. The pneumatic rods 53 are connected to the lifting and positioning platform 55 via the lifting rod 54. The lifting and positioning platform 55 is connected to the steel arch frame C103 via the fixing rod C56. The fixing rods A44 and B45 are respectively connected to the steel arch frame A101 and the steel arch frame B102.

[0039] The steel arch frames A101, B102, and C103 are integrally formed with a mating flange 104 at their joint ends. Bolt holes 105 are opened on the mating flange 104 and high-strength bolts 106 are inserted to complete the assembly. The mating surfaces of the mating flange 104 are provided with interlocking convex positioning stops 107 and concave positioning stops 108 to achieve rapid alignment and prevent misalignment.

[0040] Working principle

[0041] Equipment preparation: Before operation, two vehicle bodies 1 are symmetrically arranged on the left and right sides of the tunnel along the transverse direction. Each vehicle body 1 is formed by half-body A11 and half-body B12 being locked together by connecting fixed shaft 3 and positioning pin 32 to form an integral traveling carrier. Rotating sleeve 31 is fitted on the outside of connecting fixed shaft 3, and axial limiting is achieved by using the limiting retaining rings at both ends, which serve as the rotation fulcrum of rotating lifting rod 4. Two arc-shaped connecting rods 2 are transversely connected across the two vehicle bodies 1 to connect the two vehicle bodies into one, improving the overall stability of the movement. The three steel arch frames are assembled respectively: steel arch frame A101 and steel arch frame B102 are fixed to the top of fixed rod A44 and fixed rod B45 respectively, and steel arch frame C103 is fixed to the top of fixed rod C56 of lifting positioning platform 55.

[0042] Travel and positioning: The starting of the walking drive mechanism drives the active walking wheel 14 to rotate, which in turn drives the driven walking wheel 13 to rotate, so that the vehicle body 1 can move smoothly along the longitudinal direction of the tunnel; the two vehicle bodies are controlled in coordination by the synchronous controller 15, and are bound together by the arc-shaped connecting rod 2 to effectively avoid deviation and tilting during travel.

[0043] Steel arch frame lifting and positioning: After the vehicle body 1 is in place, the lifting drive motor 6 is started, which drives the motor gear 8 to rotate through the motor output shaft 7. Through gear meshing, the driven gear 9 of the lifting rod and the rotating sleeve 31 rotate synchronously, thereby driving the rotating lifting rod A41 and rotating lifting rod B42 to rotate and lift symmetrically with the connecting fixed shaft 3 as the fulcrum. Multiple sets of lifting drive motors 6 are centrally controlled by the synchronous controller 15 to ensure that the actions are synchronized and consistent. During the lifting process of the rotating lifting rod, the sliding rod 43 slides from one end to the other along the sliding groove 52 of the transverse support rod 51. The sliding range is limited by the guide key and the sliding stroke limit block 57. While the steel arch frame A101 and steel arch frame B102 are lifted with the rods, the vertical fine adjustment of the lifting rod 54 and the lifting positioning platform 55 is driven by the extension and retraction of the pneumatic rod 53. The height of the steel arch frame C103 is adjusted in real time to avoid assembly interference until the three sections of the steel arch frame reach the preset support contour position.

[0044] Steel arch frame assembly and fixing: After steel arch frames A101, B102 and C103 are aligned, the convex positioning stop 107 and concave positioning stop 108 on the mating surface of the butt flange 104 are quickly aligned. After aligning the bolt holes 105, high-strength bolts 106 are inserted and locked, so that the three components are assembled into an integral arc-shaped support arch frame, which conforms to the contour of the tunnel surrounding rock and completes the initial support layout.

[0045] Support completion and device reset: After the support is formed, the connecting bolts between the steel arch frame 10 and each fixed rod are removed; the lifting drive motor 6 is reversed to drive the rotating lifting rod 4 to rotate and reset; at the same time, the pneumatic rod 53 is retracted to make the lifting positioning platform 55 fall back to the initial low position; then the walking drive mechanism is started to drive the vehicle 1 to the next support position, and the above process is repeated to realize the continuous mechanized support operation of the tunnel steel arch frame.

Claims

1. A tunnel steel arch support device, characterized in that: It includes a vehicle body (1), an arc-shaped connecting rod (2), a connecting fixed shaft (3), a rotating sleeve (31), a positioning pin (32), a rotating lifting rod (4), a lifting positioning system (5), a lifting drive motor (6), a motor output shaft (7), a motor gear (8), a lifting rod driven gear (9), a steel arch frame (10), a synchronous controller (15), and a walking drive mechanism; The rotating lifting rod (4) includes a rotating lifting rod A (41), a rotating lifting rod B (42), a sliding rod (43), a fixed rod A (44), and a fixed rod B (45); the lifting positioning system (5) includes a transverse support rod (51), a sliding groove (52), a pneumatic rod (53), a lifting rod (54), a lifting positioning platform (55), a fixed rod C (56), and a sliding stroke limit block (57); the steel arch frame (10) is assembled from steel arch frame A (101), steel arch frame B (102), and steel arch frame C (103) in sections by connecting flanges (104), and the connecting flanges (104) include bolt holes (105), a convex positioning stop (107), and a concave positioning stop (108). Two vehicle bodies (1) are provided, and the two vehicle bodies (1) are symmetrically arranged on the left and right sides of the tunnel, and each vehicle body (1) is arranged along the longitudinal direction of the tunnel; each vehicle body (1) is assembled from half vehicle body A (11) and half vehicle body B (12). The half vehicle body A (11) and half vehicle body B (12) are detachably and fixedly connected by a connecting fixed shaft (3) and a positioning pin (32), and the connecting fixed shaft (3) is hinged to both half vehicle body A (11) and half vehicle body B (12); the lower part of half vehicle body A (11) is provided with a driven walking wheel (13), and the lower part of half vehicle body B (12) is provided with an active walking wheel (14); the driven walking wheel (13) and the active walking wheel (14) have the same wheel diameter, and the walking drive mechanism is coaxially and fixedly connected to the active walking wheel (14); Two arc-shaped connecting rods (2) are provided. The two arc-shaped connecting rods (2) span across the tunnel between the two vehicle bodies (1) and their arc-shaped contours are adapted to the contours of the tunnel bottom sides. One arc-shaped connecting rod (2) is fixedly connected to the top surface of half-body A (11) of the two vehicle bodies (1) at both ends, and the other arc-shaped connecting rod (2) is fixedly connected to the top surface of half-body B (12) of the two vehicle bodies (1) at both ends. A synchronous controller (15) is fixedly installed on the top of the arc-shaped connecting rod (2). Each vehicle body (1) has a rotating sleeve (31) fitted on the outside of the connecting fixed shaft (3). The rotating sleeve (31) and the connecting fixed shaft (3) are fitted with clearance. An axial limiting structure is provided between the rotating sleeve (31) and the connecting fixed shaft (3). The axial limiting structure is a limiting retaining ring fitted on both ends of the connecting fixed shaft (3) to limit the axial displacement of the rotating sleeve (31). A lifting rod driven gear (9) is fixedly connected to each side of the rotating sleeve (31) by a flat key. The outside of the rotating sleeve (31) is welded and fixed to the rotating lifting rod A (41) and the rotating lifting rod B (42). The lifting rod driven gear (9), the connecting fixed shaft (3) and the rotating sleeve (31) are arranged coaxially. The connecting fixed shaft (3) serves as the rotation fulcrum of the rotating lifting rod A (41) and the rotating lifting rod B (42). Each vehicle body (1) has a lifting drive motor (6) with a mounting bracket fixedly installed on the inner wall of half-body A (11) and half-body B (12) near the center of the tunnel. The mounting bracket is detachably fixed to half-body A (11) and half-body B (12) by bolts. The output end of the lifting drive motor (6) is fixed coaxially with the motor output shaft (7). The motor output shaft (7) is coaxially fixed with a motor gear (8). The motor gear (8) on the same side meshes with the driven gear (9) of the corresponding lifting rod. The two lifting drive motors (6) on each vehicle body (1) synchronously drive the rotating lifting rod A (41) and rotating lifting rod B (42) to rotate and lift with the connecting fixed shaft (3) as the fulcrum. Both lifting drive motors (6) are electrically connected to the synchronous controller (15). The synchronous controller (15) is used to control the speed and direction of the two lifting drive motors (6) to achieve synchronous lifting. Sliding rods (43) are horizontally fixed on both rotating lifting rod A (41) and rotating lifting rod B (42). Fixed rods A (44) and B (45) are vertically fixed on the top of rotating lifting rod A (41) and rotating lifting rod B (42), respectively. The transverse support rod (51) is erected transversely between rotating lifting rod A (41) and rotating lifting rod B (42) along the tunnel. Two sets of symmetrical sliding grooves (52) are opened in the middle of the transverse support rod (51). The sliding rod (43) is slidably embedded in the sliding groove (52). A guide key is provided between the sliding groove (52) and the sliding rod (43) to realize sliding guidance. The sliding stroke limit block (57) is fixed in the sliding groove (52) to limit the sliding stroke of the sliding rod (43). The top surface of the horizontal support rod (51) is vertically fixed with four sets of pneumatic rods (53). The four sets of pneumatic rods (53) are arranged in a rectangular symmetrical pattern. The telescopic ends of the pneumatic rods (53) are fixedly connected to the lifting rod (54). The top of the lifting rod (54) is fixedly connected to the lifting positioning platform (55). The top surface of the lifting positioning platform (55) is vertically fixed with a fixing rod C (56). The top of the fixing rod C (56) is detachably fixed to the steel arch frame C (103) by bolts. The telescopic movement of the pneumatic rods (53) can drive the lifting rod (54), the lifting positioning platform (55) and the steel arch frame C (103) to rise and fall synchronously. The top ends of the fixing rods A (44) and B (45) are detachably fixed to the steel arch frame A (101) and the steel arch frame B (102) by bolts, respectively.

2. The tunnel steel arch support device according to claim 1, characterized in that: The joint ends of the steel arch frames A (101), B (102), and C (103) are all equipped with joint flanges (104), which are integrally formed with the ends of the steel arch frames (10). Four identical bolt holes (105) are symmetrically provided on the joint flanges (104), and high-strength bolts (106) are fitted into the bolt holes (105). (103) can be disassembled and assembled into a whole by high-strength bolts (106); the mating surface of the mating flange (104) is provided with a convex positioning stop (107) and a concave positioning stop (108) that match each other. The convex positioning stop (107) is a rectangular boss, and the concave positioning stop (108) is a groove that matches the rectangular boss. The convex positioning stop (107) and the concave positioning stop (108) are fitted together to realize the alignment limit and error prevention of the segmented assembly of the steel arch frame.

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