Arch ring installation positioning system and high-altitude axis positioning method for segmental assembly type arch bridge

Abstract

An arch ring installation positioning system and high-altitude axis positioning method of a segmental assembly arch bridge, the installation positioning system comprising: a fixing device installed on an arch seat; a first guide beam assembly and a second guide beam assembly respectively installed on the upper side of the fixing device and the positioning adjusting device and respectively arranged relative to the bottom end and the top end of the segmental beam, two monitoring prisms respectively installed on one side of the first guide beam assembly and the second guide beam assembly, facilitating monitoring the axial displacement of the fixing device and the positioning adjusting device in cooperation with a total station, and the high-altitude hoisting monitoring prism being magnetically connected to the central axis of the side surface of the segmental beam, facilitating the segmental beam to directly reach the top of the theoretical central axis and facilitating beam falling. The design can adjust the plane and elevation of the two ends of the segmental beam through the fixing device and the positioning adjusting device, thereby facilitating the segmental beam to directly slide into the first guide beam assembly and the second guide beam assembly, ensuring that the segmental beam directly reaches the design position through one-time hoisting, and preventing the axial displacement of the connecting part from causing the misalignment of the joint part.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to an arch ring installation and positioning system and a high-altitude axis positioning method for a segmental assembled arch bridge. Background Technology

[0002] An arch bridge is a type of bridge that uses steel or concrete as its main load-bearing structure. Due to the large span of arch bridges, they are often prefabricated in advance and assembled on site to form an arch ring for ease of construction. Therefore, the arch ring is mainly composed of components such as the arch seat, arch foot, quarter section, and arch crown. After being hoisted on site in sequence, they are connected by welding through the installation of diaphragms and pre-embedded steel plates to form overall rigidity.

[0003] Because the arch ring needs to be hoisted and assembled on-site at high altitudes, high requirements are placed on lifting safety, high-altitude operations, and alignment deviation. In particular, the alignment deviation of the completed bridge is generally required to be less than 1 / 15000 of the bridge length to ensure axial load. It is usually required that the flatness error during the construction stage be ≤0.5mm and the three-dimensional coordinate positioning accuracy be ≤±2mm. Once misaligned, according to the structural stress characteristics, it is very easy to become unstable and cause the bridge to collapse, resulting in a major accident. Therefore, axial positioning is of paramount importance during the installation process.

[0004] Arch segments are generally installed and positioned using hoisting methods. For example, Chinese Patent CN202410675954.6 discloses a construction method for reinforcing existing arch bridges with precast arch standard blocks. In this method, a crane is used to assemble the arch segments into narrow sections, and then a traction device is used to drag the narrow sections along a transverse platform to the designated position. Finally, concrete is poured to form the entire prefabricated arch. During construction, the crane is mainly used for lifting and installing large sections and adjusting the arch alignment. However, during the hoisting process, the heavy segmental beams are subject to inertial forces or external forces, causing them to sway back and forth, resulting in missing edges and corners. Due to the lack of limiting and fine-tuning devices, positioning is difficult, making it difficult to install in place in one go. The back-and-forth movement of the whole structure not only wastes machinery, manpower, and time, but also poses a safety challenge. At the same time, it is difficult for people to stand and perform three-dimensional coordinate positioning of the axis when splicing segmental beams, resulting in large and uneliminable errors in the center axis positioning between segments. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects and problems of low positioning accuracy and installation efficiency in the existing technology, and to provide an arch ring installation positioning system and high-altitude axis positioning method for segmental assembled arch bridges with high positioning accuracy and installation efficiency.

[0006] To achieve the above objectives, the technical solution of the present invention is: an arch ring installation and positioning system for a segmental assembled arch bridge, comprising: a fixing device, a working platform, a positioning adjustment device, two monitoring prisms, a high-altitude hoisting monitoring prism, a first guide beam assembly, and a second guide beam assembly. The fixing device is installed on the arch seat. The first guide beam assembly and the second guide beam assembly are respectively installed on the upper side of the fixing device and the positioning adjustment device and are respectively arranged relative to the bottom end and top end of the segmental beam. The two monitoring prisms are respectively installed on one side of the first guide beam assembly and the second guide beam assembly. The high-altitude hoisting monitoring prism is connected to the central axis of the side of the segmental beam.

[0007] The fixing device is used to adjust and fix the planar position and elevation of the bottom end of the segmental beam;

[0008] The positioning and adjustment device is used to adjust the planar position and elevation of the second guide beam assembly so that the planar position and elevation of the top of the segment beam reach the design position, and to perform spatial docking and positioning of the two ends of the subsequent node beam.

[0009] The high-altitude hoisting monitoring prism is used to monitor the spatial axis position of the segmental beam in real time during installation.

[0010] The first guide beam assembly is used to contact the bottom end of the temporary fixed segment beam via three-sided lines;

[0011] The second guide beam assembly is used to contact the top of the temporary fixed segment beam or both ends of the subsequent segment via a three-sided line;

[0012] The two monitoring prisms are used to monitor the spatial positions of the fixing device and the positioning adjustment device in real time, respectively.

[0013] The fixing device includes a pad, a fixing component, and a leveling component. The lower side of the pad is connected to the arch seat through the fixing component. The leveling component is located between the pad and the arch seat and is used to adjust the spatial position of the pad to spatially limit the bottom end of the segmental beam.

[0014] The leveling assembly includes multiple leveling screws. The pad has first threaded holes corresponding to the multiple leveling screws one by one. The multiple leveling screws are threaded to the multiple first threaded holes and their bottom ends abut against the upper surface of the pre-embedded steel plate in the arch seat.

[0015] The positioning and adjusting device includes a working platform, a base plate, a lifting assembly, and a limiting assembly. The base plate is placed on the working platform. The lifting assembly is installed on the upper side of the base plate and its output end is connected to a support plate. The support plate is located on the upper side of the base plate. The limiting assembly is located on the upper and lower sides of the support plate and is used to mechanically limit the support plate after the lifting assembly lifts the support plate to the design elevation.

[0016] Two sets of variable tie-up assemblies are provided between the lifting assembly and the limiting assembly. Each set of variable tie-up assemblies includes two tie rods, two connecting seats, and two connecting shafts. The two tie rods are arranged in an X-shape, and a rotating shaft is rotatably connected to the center of the two tie rods. The two connecting seats are symmetrically arranged and respectively connected to the upper side of the base plate and the lower side of the support plate. The two connecting shafts are horizontally arranged and respectively rotatably connected to the two connecting seats. The two ends of the connecting shafts are symmetrically provided with forward threads and reverse threads. Slider blocks are threadedly connected to both the forward threads and reverse threads. The four sliders are respectively hinged to the upper and lower ends of the two tie rods.

[0017] The first guide beam assembly includes two first guide beam plates and a clip. The two first guide beam plates are symmetrically installed on the upper side of the fixing device. A gap matching the width of the segment beam is provided between the two first guide beam plates. The clip is connected to the upper side of the fixing device and arranged relative to the bottom end of the segment beam. A first stiffening plate is connected between the clip and the fixing device.

[0018] The second guide beam assembly includes a beam bottom plate for bearing the weight of the segment beam. The beam bottom plate is vertically installed on the upper side of the horizontal axis of the positioning adjustment device. Second guide beam plates for guiding the segment beam to slide in are symmetrically arranged on the left and right sides of the beam bottom plate. A second stiffening plate is connected between the beam bottom plate and the positioning adjustment device.

[0019] Fine-tuning components are symmetrically installed on the first guide beam plate and the second guide beam plate. The fine-tuning components include angle steel, fine-tuning screw, and top beam plate. The angle steel is connected to the side of the first guide beam plate and the second guide beam plate. The fine-tuning screw is threaded to the angle steel. The top beam plate is rotatably connected to one end of the fine-tuning screw and is arranged relative to the side of the segment beam.

[0020] The high-altitude hoisting monitoring prism includes a switch magnetic base, a horizontal positioning component, a suspension positioning component, and a prism lens. The bottom of the switch magnetic base is magnetically connected to the side of the segmental beam. The bottom of the horizontal positioning component is rotatably connected to one side of the switch magnetic base and is arranged perpendicular to the bottom of the switch magnetic base. The suspension positioning component is rotatably connected to the top of the horizontal positioning component. A plumb bob is connected to the lower side of the suspension positioning component. The prism lens is connected to the upper side of the suspension positioning component and its axis coincides with the axis of the plumb bob. The front of the prism lens is arranged opposite to the total station.

[0021] A method for high-altitude axis positioning of the arch ring of a segmental assembled arch bridge, which is applied to an arch ring installation and positioning system for a segmental assembled arch bridge, includes the following steps:

[0022] Using a total station, the longitudinal and transverse centerlines of the bottom end face of the segmental beam are laid out on the arch seat and cross lines are drawn. Then, the frame lines of the fixing device are drawn with the cross lines as a reference. The fixing device is then installed so that the longitudinal and transverse centerlines of the fixing device coincide with the cross lines and the sides are aligned with the frame lines. At the same time, the plane position and elevation of the fixing device are adjusted. Then, the first guide beam assembly is adjusted to limit the horizontal movement of the segmental beam to ensure that the centerline of the segmental beam reaches the design position after the beam is lowered. After the adjustment is completed, the fixing device is fixed on the arch seat. The three-dimensional coordinates of the fixing device are measured by the monitoring prism on the first guide beam assembly as the initial displacement value.

[0023] After obtaining the elastic and inelastic deformation of the working platform through preloading, the positioning adjustment device is placed on the working platform by marking lines. The bottom plate is leveled by using shims. Then, the reflecting prism is placed at the center of the second guide beam assembly. The three-dimensional coordinates of the reflecting prism are measured using a total station so that the transverse centerline of the second guide beam assembly is directly below the design centerline of the segment beam. Then, the positioning adjustment device is connected to the working platform. The top surface elevation of the second guide beam assembly is raised to the design bottom elevation of the segment beam by the lifting assembly and then locked by the limiting assembly. The three-dimensional coordinates of the positioning adjustment device are measured by the monitoring prism on the second guide beam assembly as the initial displacement value.

[0024] The segmental beam is hoisted using lifting equipment. The position of the central axis of the segmental beam is monitored in real time by a high-altitude hoisting monitoring prism. When it reaches directly above the fixing device and the positioning adjustment device, the beam is lowered, allowing it to automatically slide into place along the inclined surfaces of the first guide beam assembly and the second guide beam assembly, respectively. At the same time, the three-dimensional coordinates of the monitoring prism on the fixing device and the positioning adjustment device are measured by a total station to obtain the offset of the beam's central axis during the lowering process. If the error exceeds the limit, the planar position and elevation of the central axis at both ends of the segmental beam are adjusted by adjusting the fixing device and the positioning adjustment device, so that the spatial position of the central axis of the segmental beam directly reaches the design value.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. In this invention, an arch ring installation and positioning system and a high-altitude axis positioning method for a segmental assembled arch bridge utilize two monitoring prisms. These prisms monitor the axis displacement of the fixing and positioning adjustment devices before and after each segmental beam section, preventing misalignment at the joints due to stress. The high-altitude hoisting monitoring prisms installed on the side axes at both ends of the beam section assist in reaching the predetermined centerline, facilitating direct sliding of the beam section into position via the inclined surfaces of the first and second guide beam assemblies. No personnel are required on the work platform throughout the process; pre-set three-sided contact limits allow the beam section to reach the designed position in one go, effectively preventing accidents caused by the collapse of the confined work platform during hoisting. After positioning, the three-dimensional coordinates of the monitoring prisms are measured using a total station to obtain the offset of the beam's centerline during lowering. If the error exceeds the limit, the fixing and positioning adjustment devices are fine-tuned to ensure accurate elevation and planar position. Furthermore, the entire process requires only one crane, avoiding the current need for multiple cranes. Therefore, this invention offers high positioning accuracy and installation efficiency.

[0027] 2. In the arch ring installation and positioning system and high-altitude axis positioning method of the segmental assembled arch bridge of the present invention, the planar position of the pad can be adjusted by the leveling component. By moving the pad along the positioning component, the top surface of the bracket is made to be at the same elevation as the end of the segmental beam. The pad is firmly fixed to the arch seat by the fixing component. Through the forced limiting support of the upper beam drop and the lower and left and right three-sided line contact, the center axis and elevation of the arch foot segment are directly reached to the design position without manual back and forth adjustment. This avoids the horizontal swing of the component due to external forces such as wind and inertia, which makes it difficult to position. It also avoids the need for personnel to assist at height or collisions that may cause chipped edges and corners. The self-limiting support eliminates the need for temporary fixation after hoisting, effectively ensuring construction safety, positioning accuracy and work efficiency. After positioning, the fixing component can also be permanently placed to assist in fixing the arch foot during sealing. Therefore, the present invention has high positioning accuracy and good safety.

[0028] 3. In the arch ring installation and positioning system and high-altitude axis positioning method of the present invention for a segmental assembled arch bridge, a monitoring prism is used to monitor the fixing device and positioning adjustment device in real time. During positioning, the spatial positions of each limiting component of the device are set with reference to the preload data. By monitoring the absolute displacement value to obtain the positioning deviation, the jacking component and the fine-tuning component are assisted to ensure that the central axis of the segmental beam directly reaches the design position. The entire process does not require surveyors to stand on the segmental beam to place the prism for axis positioning, saving manpower and machine shifts while ensuring personnel safety. Therefore, the present invention has high positioning accuracy and high positioning efficiency.

[0029] 4. In the arch ring installation and positioning system and high-altitude axis positioning method of the present invention for a segmental assembled arch bridge, the elevation of the beam bottom plate can be adjusted by the lifting component to ensure the vertical height of the segmental beam. The second guide beam plate allows the segmental beam to slide quickly into the upper part of the beam bottom plate while ensuring the accurate planar position of the beam axis. After the segmental beam is lowered, the second guide beam plate and the beam bottom plate work together to axially limit the segmental beam while facilitating the assembly of the next segment. The limiting component and the lifting component jointly resist the load of the segmental beam and provide vertical limitation. The variable tie component can effectively prevent horizontal displacement of the support plate after being stressed, thereby avoiding the retraction or horizontal displacement of the lifting component under long-term stress, which could lead to misalignment of the segmental beam axis. Therefore, the present invention has good stability and small positioning error.

[0030] 5. In the arch ring installation and positioning system and high-altitude axis positioning method of the segmental assembled arch bridge of the present invention, the limiting component and the variable tie component work together to provide reaction force to limit the vertical and horizontal displacement of the support plate after being subjected to force; the tie rod is designed in an X shape, so that when the connecting shaft is rotated, the two sliders can move in opposite directions simultaneously due to the reverse thread on the connecting shaft, thereby adjusting the spatial state of the tie rod by rotating the connecting shaft. The top and bottom of the connecting seat are fixed on the central axis of the top surface of the bottom steel plate and the bottom surface of the supporting steel plate, respectively; by using a stepped bushing, lateral displacement can be avoided when the connecting shaft rotates, thus affecting the positioning accuracy of the segmental beam; by setting a rotating rod, the rotation of the connecting shaft can be facilitated. Therefore, the present invention has a stable structure and high positioning accuracy.

[0031] 6. In the arch ring installation and positioning system and high-altitude axis positioning method of the present invention for a segmental assembled arch bridge, since the first guide beam plate and the second guide beam plate are installed symmetrically, during the process of the crane hoisting the arch foot segment, when the two ends of the segment beam fall between the two first guide beam plates and the second guide beam plate respectively, the arch foot will fall down the slope until it is placed on the bracket and the bottom plate of the beam. At this time, the sides and bottom of the two ends of the segment beam are automatically and forcibly limited under the action of their own weight. Therefore, the axis can be directly and automatically positioned without manual adjustment. By setting a fine adjustment component, rotating the fine adjustment screw on the guide beam plate will make lateral fine adjustment to the top beam plate, thereby adjusting the lateral position of the first guide beam plate and the second guide beam plate. This prevents the outer surface size from being too large or slightly deformed due to the expansion of the concrete beam segment during pouring, which would prevent the beam from being placed. It can also make horizontal fine adjustments during the beam placement process to ensure that the beam segment axis is in place and that the axis is under stress. Therefore, the present invention has high positioning accuracy and structural stability.

[0032] 7. In the arch ring installation and positioning system and high-altitude axis positioning method of the present invention for a segmental assembled arch bridge, the high-altitude hoisting monitoring prism is stably adsorbed onto the central axis of the side of the segmental beam using a switching magnetic base, avoiding the need for personnel to place the prism for monitoring. Because the internal magnet of the switching magnetic base changes the direction of the magnetic field when rotated, the switching magnetic base can be adsorbed onto the predetermined position on the segmental beam. After hoisting, rotating the internal magnet again separates the switching magnetic base from the segmental beam, making installation and disassembly convenient. Because a horizontal positioning component is set and is perpendicular to the bottom surface of the switching magnetic base, when the switching magnetic base adsorbs onto the central axis of the web, the horizontal positioning component will also automatically be perpendicular to the central axis of the side of the web. Because a suspension positioning component is set, with the suspension axis intersecting the horizontal positioning axis and located at its center, the prism will always remain vertical under the gravity of the plumb bob. Thus, the three-dimensional coordinates of the monitoring point at the central axis of the segmental beam can be directly measured using a total station, and precise positioning of the segmental beam can be achieved based on the three-dimensional coordinates. Therefore, the present invention is easy to install and has a wide range of applications. Attached Figure Description

[0033] Figure 1 This is an installation schematic diagram of an arch ring installation and positioning system for a segmental assembled arch bridge according to the present invention.

[0034] Figure 2 This is a schematic diagram showing the connection of the fixing device, arch seat, and segmental beam in this invention.

[0035] Figure 3 This is a schematic diagram of the fixing device in this invention.

[0036] Figure 4 This is a schematic diagram of the structure of the pad in this invention.

[0037] Figure 5 This is a schematic diagram of the structure of the first guide beam plate and the fine-tuning component in this invention.

[0038] Figure 6 This is a schematic diagram of the segmental beam and positioning adjustment device in this invention.

[0039] Figure 7 This is a schematic diagram of the positioning adjustment device and the second guide beam assembly in this invention.

[0040] Figure 8 This is a schematic diagram of the positioning adjustment device in this invention.

[0041] Figure 9 This is a schematic diagram of the support plate in this invention.

[0042] Figure 10 This is a schematic diagram of the variable tethering component in this invention.

[0043] Figure 11This is a schematic diagram of the structure of the second guide beam plate and the fine-tuning component in this invention.

[0044] Figure 12 This is a schematic diagram of the high-altitude hoisting monitoring prism in this invention.

[0045] Figure 13 This is a cross-sectional schematic diagram of the switch magnetic base in this invention.

[0046] Figure 14 This is a cross-sectional schematic diagram of the horizontal positioning component and the suspended positioning component in this invention.

[0047] In the diagram: Fixing device 1, pad 11, triangular notch 111, elliptical positioning groove 112, first threaded hole 113, fixing assembly 12, positioning bolt 121, leveling assembly 13, leveling screw 131, positioning adjustment device 2, working platform 21, base plate 22, lifting assembly 23, hydraulic jack 231, limit assembly 24, first screw 241, first nut 242, second nut 243, variable tie assembly 25, tie rod 251, rotating shaft 252, connecting shaft 253, connecting seat 254, connecting block 2541, slider 255, mounting hole 256, rotating rod 257, bushing 258, support plate 26, trapezoidal hole 261, high-altitude hoisting monitoring prism 3, switching magnetic base 31, magnetic conductor 311, soft magnet 312, permanent magnet 313, cavity 31 4. Shaft 315, Handle 316, Copper Plate 317, Cylindrical Inner Cavity 318, Slanted Convex Shoulder Groove 319, Horizontal Positioning Assembly 32, Mounting Block 321, Centering Rod 322, Pointed Head 323, Second Threaded Hole 324, Stepped Shaft 325, Slotted Groove 326, Suspension Positioning Assembly 33, Joint Bearing 331, Nut 332, Hanger Rod 333, Lower Nut 334, Upper Nut 335, Second Screw 336, Prism Lens 34, Plumb Ball 35, First Guide Beam Assembly 4, First Guide Beam Plate 41, Clip 42, Gap 43, First Stiffening Plate 44, Second Guide Beam Assembly 5, Beam Bottom Plate 51, Second Guide Beam Plate 52, Second Stiffening Plate 53, Fine Adjustment Assembly 6, Plastic Anti-collision Slider 61, Angle Steel 62, Fine Adjustment Screw 63, Top Beam Plate 64, Monitoring Prism 7, Arch Seat 8, Segmental Beam 9. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Example 1:

[0050] See Figure 1An arch ring installation and positioning system for a segmental assembled arch bridge includes: a fixing device 1, a working platform 21, a positioning adjustment device 2, two monitoring prisms 7, a high-altitude hoisting monitoring prism 3, a first guide beam assembly 4, and a second guide beam assembly 5. The fixing device 1 is installed on the arch seat 8. The first guide beam assembly 4 and the second guide beam assembly 5 are respectively installed on the upper side of the fixing device 1 and the positioning adjustment device 2 and are respectively arranged relative to the bottom end and the top end of the segmental beam 9. The two monitoring prisms 7 are respectively installed on one side of the first guide beam assembly 4 and the second guide beam assembly 5. The high-altitude hoisting monitoring prism 3 is connected to the central axis of the side of the segmental beam 9.

[0051] The fixing device 1 is used to adjust and fix the planar position and elevation of the bottom end of the segmental beam 9;

[0052] The positioning adjustment device 2 is used to adjust the planar position and elevation of the second guide beam assembly 5 so that the planar position and elevation of the top of the segment beam 9 reach the design position, and to perform spatial docking and positioning of the two ends of the subsequent node beam 9.

[0053] The high-altitude hoisting monitoring prism 3 is used to monitor the spatial axis position of the segmental beam 9 in real time during installation;

[0054] The first guide beam assembly 4 is used to contact the bottom end of the temporary fixed segment beam 9 via three-sided lines;

[0055] The second guide beam assembly 5 is used to contact the top of the temporary fixed segment beam 9 or both ends of the subsequent segment via a three-sided line;

[0056] The two monitoring prisms 7 are used to monitor the spatial positions of the fixing device 1 and the positioning adjustment device 2 in real time, respectively.

[0057] In this embodiment, three-sided line contact means that the first guide beam assembly 4 and the second guide beam assembly 5 contact the segment beam 9 through the top, left, and right sides. The initial contact surfaces of the first guide beam assembly 4 and the second guide beam assembly 5 with the segment beam 9 can be set as inclined surfaces to facilitate the sliding of the segment beam 9. By installing two monitoring prisms 7, the axial displacement of the fixing device 1 and the positioning adjustment device 2 can be monitored before and after the segment body is segmented. By installing high-altitude hoisting monitoring prisms 3 at the axial positions of both ends of the segment beam 9, the segment beam can be assisted in reaching the predetermined central axis, as well as the spatial axial position of the segment beam 9 after the next segment is connected to this segment. Monitoring can prevent the connection part from being misaligned due to stress. The plane and height of the second guide beam assembly 5 can be adjusted by the positioning adjustment device 2, so that the segment beam 9 can slide directly into the second guide beam assembly 5. This ensures that the axis of the segment beam 9 directly reaches the design position. At the same time, only one crane is needed to complete the whole process, avoiding the previous situation where one crane was needed to maintain the spatial position at the connection part, and another segment was lifted by a crane and connected in the air.

[0058] Example 2:

[0059] The basic content is the same as in Example 1, except that:

[0060] See Figure 2 The fixing device 1 includes a pad 11, a fixing component 12, and a leveling component 13. The lower side of the pad 11 is connected to the arch seat 8 through the fixing component 12. The leveling component 13 is located between the pad 11 and the arch seat 8 and is used to adjust the spatial position of the pad 11 to spatially limit the bottom end of the segmental beam 9.

[0061] In this embodiment, the side of the pad 11 has triangular notches 111 along the longitudinal and transverse central axes. The triangular notches 111 are arranged relative to the cross positioning axis of the arch seat 8. By opening the triangular notches 111, the bottom end of the arch foot segment beam 9 can be forcibly and directly positioned by fine-tuning the pad 11, reducing positioning errors and improving work efficiency. When the arch seat 8 is poured with concrete, a steel plate should be pre-embedded. After pouring, the longitudinal and transverse axes of the end face of the arch ring segment beam 9 are marked on the arch seat 8 using a total station and cross lines are marked. Then, the edge lines of the pad 11 are marked on both sides of the cross lines. After drilling four threaded holes or welding four nuts on the pre-embedded steel plate, the pad 11 is movably connected to the pre-embedded steel plate by the fixing component 12. Then, the pad 11 is moved. Align the triangular notch 111 on its side with one of the cross lines, adjust the level and elevation of the pad 11 using the leveling component 13 on the arch seat 8, then measure the elevation of the top side of the first guide beam assembly 4, and slide the pad 11 back and forth along the axis to make the elevation of the top surface of the card holder 42 the same as the elevation of the bottom of the segment beam 9. After adjustment, the pad 11 is firmly fixed to the arch seat 8 by fixing the component 12 and welding reinforcement. At this time, the arch foot segment beam 9 can be lifted by a crane and placed directly on the pad 11, so that the centerline and height of the bottom end of the arch foot segment can directly reach the design position. The forced limit simplifies the temporary consolidation process and ensures the spatial state of the beam. The absence of a complicated adjustment process improves work efficiency.

[0062] Example 3:

[0063] The basic content is the same as Example 2, except that:

[0064] See Figure 3 and Figure 4 The fixing component 12 includes multiple positioning bolts 121. The pad 11 is symmetrically provided with elliptical positioning grooves 112 corresponding to the multiple positioning bolts 121. The multiple positioning bolts 121 pass through the multiple elliptical positioning grooves 112 and are threaded to the embedded steel plate on the arch seat 8. The number of positioning bolts 121 and elliptical positioning grooves 112 is four. The four elliptical positioning grooves 112 are symmetrically and parallelly arranged in a direction parallel to the central axis of the segment beam 9.

[0065] In this embodiment, parallel lines are drawn on both sides of the crosshair according to the center distance of the elliptical positioning groove 112. After the pad 11 is placed on the arch seat 8, the positioning bolt 121 is passed through the elliptical positioning groove 112 and connected to the pre-embedded steel plate. After the spatial position of the pad 11 is adjusted, the positioning bolt 121 is tightened and welded for reinforcement, so that the pad 11 is firmly fixed on the arch seat 8. Since the elliptical positioning groove 112 is elliptical, it can move along the positioning bolt 121. In this way, the pad 11 can adjust the top surface elevation of the card holder 42 by sliding back and forth along the axis, and then be fixed by the positioning bolt 121. The elliptical positioning groove 112 is arranged in a parallel and symmetrical manner along the central axis of the pad 11, which can facilitate the sliding of the pad 11 along the axis. The positioning bolts 121 evenly distributed on the pad 11 can make the pad 11 bear force evenly.

[0066] Example 4:

[0067] The basic content is the same as Example 2, except that:

[0068] See Figure 3 and Figure 4 The leveling assembly 13 includes multiple leveling screws 131. The pad 11 has first threaded holes 113 corresponding to the multiple leveling screws 131. The multiple leveling screws 131 are threaded to the multiple first threaded holes 113 respectively, and their bottom ends abut against the upper end face of the pre-embedded steel plate in the arch seat 8. There are three first threaded holes 113. The three first threaded holes 113 are arranged in an equilateral triangle and one of their axes of symmetry is parallel to the central axis of the pad 11.

[0069] In this embodiment, the level and elevation of the pad 11 can be adjusted by rotating the leveling screw 131 on the pre-embedded steel plate of the arch seat 8. Specifically, the three leveling screws 131 are screwed into the first threaded hole 113 respectively, and then the leveling screws 131 are rotated until the height of the pad 11 changes. An electronic level is adsorbed on the upper surface of the pad 11. The plane tilt angle of the pad 11 can be adjusted by adjusting the leveling screw 131 at any one end. Then, the elevation of the top surface of the pad 11 can be adjusted by adjusting the leveling screws 131 at the three vertices as a whole.

[0070] By using three leveling screws 131, when the leveling screws 131 are rotated, the pad 11 is connected to the leveling screws 131 through the first threaded hole 113, which will drive the pad 11 to move up and down. Since the first threaded hole 113 is distributed in an equilateral triangle, the pad 11 can be quickly leveled and the top surface of the pad 11 can reach the design elevation surface by using three points to form a surface, thereby ensuring that the bottom end of the segment beam 9 directly reaches the design elevation.

[0071] Example 5:

[0072] The basic content is the same as Example 2, except that:

[0073] See Figure 6 The positioning and adjusting device 2 includes a working platform 21, a base plate 22, a lifting assembly 23, and a limiting assembly 24. The base plate 22 is placed on the working platform 21. The lifting assembly 23 is installed on the upper side of the base plate 22 and its output end is connected to a support plate 26. The support plate 26 is located on the upper side of the base plate 22. The limiting assembly 24 is located on the upper and lower sides of the support plate 26 and is used to mechanically limit the support plate 26 after the lifting assembly 23 lifts the support plate 26 to the design elevation.

[0074] In this embodiment, the working platform 21 can be supported by scaffolding or steel pipe columns. If necessary, guy ropes can be added to prevent overturning. This device can be used for end axis positioning of the middle segment of the arch ring or both ends of the arch crown. After a pre-loading test, the elastic and inelastic deformation of the working platform 21 is obtained, and the horizontal displacement is monitored to obtain lateral stability. If necessary, additional supports can be added for reinforcement to avoid horizontal displacement and safety accidents. This is achieved by placing the device on a pre-loaded and stabilized scaffolding or steel pipe column support platform beforehand, and using steel shims to secure the base plate 2 of the device. 2. Leveling is performed. Using a total station, the longitudinal and transverse center lines of the device can be positioned directly below the design centerline of the segmental beam 9. Then, the base plate 22 is firmly connected to the working platform 21 below. The lifting assembly 23 is used to lift the beam so that the top surface elevation of the beam base plate 51 reaches the design elevation of the bottom of the segmental beam 9. At this time, the support plate 26 is fixed by the limiting assembly 24. Then, the segmental beam 9 is hoisted and slid directly into the guide beam plate to unload. At this time, the plane position and elevation of the segmental beam 9 are directly reached to the design position through one hoisting, without the need for fine adjustment by traditional methods.

[0075] Example 6:

[0076] The basic content is the same as Example 5, except that:

[0077] See Figures 7 to 8The lifting assembly 23 includes a hydraulic jack 231, which is installed at the center of the base plate 22. The piston rod of the hydraulic jack 231 abuts against the lower center of the support plate 26. The limiting assembly 24 includes a plurality of first screws 241. One end of the plurality of first screws 241 is vertically connected to the upper side of the base plate 22. The other end of the plurality of first screws 241 passes through the support plate 26 and is threaded with a first nut 242 and a second nut 243. The first nut 242 and the second nut 243 are located on the upper and lower sides of the support plate 26, respectively. The support plate 26 has a plurality of trapezoidal holes 261 parallel and symmetrically opened along the longitudinal and transverse central axes. The plurality of trapezoidal holes 261 are arranged perpendicularly to the plurality of first screws 241. The cross section of the trapezoidal holes 261 is an isosceles trapezoid with a larger upper section and a smaller lower section.

[0078] In this embodiment, a level bubble can be installed on the support plate 26 during leveling. Four first screws 241 are arranged symmetrically along the longitudinal and transverse central axes of the base plate 22. In use, the outer edge of the base plate 22 is first laid out on the work platform 21. After the bottom of the base plate 22 is leveled and fixed, the transverse center of the support plate 26 automatically lies directly below the central axis of the segmental beam 9. Then, the hydraulic jack 231 lifts the beam so that the center elevation of the top surface of the beam base plate 51 reaches the design elevation of the bottom of the segmental beam 9. The support plate 26 is then finely adjusted by rotating the second nuts 243. Under the guidance of the level bubble on the support plate 26, the top surface of the beam base plate 51 is leveled by rotating the four second nuts 243. Finally, the first nuts 242 are tightened to press the trapezoidal holes 261 to maintain space. Position: During the jacking process, the synchronous rotation of the connecting shaft 253 changes the spatial state of the tie rod 251, which can prevent the horizontal displacement of the jacking component 23 after being subjected to force. The vertical limit is achieved by combining hydraulic jacking and mechanical limiting, which prevents the hydraulic jack 231 from shrinking due to prolonged stress or internal leakage, resulting in misalignment of the axis position. At the same time, it avoids the disadvantage of the laboriousness of using mechanical jacking. It combines the advantages to ensure that the limit can be maintained for a long time after the beam is lowered, which is conducive to the docking of the next segment beam 9. It can also avoid unexpected situations during the joint treatment after docking. When the working platform 21 sinks due to the support plate 26 being subjected to force, causing the elevation error to exceed the allowable value of the specification, the first nut 242 can be loosened and the hydraulic jack 231 can be used for jacking and fine adjustment. Then, the first nut 242 and the second nut 243 are used for limiting.

[0079] Example 7:

[0080] The basic content is the same as Example 5, except that:

[0081] See Figure 10Two sets of variable tie-up assemblies 25 are provided between the lifting assembly 23 and the limiting assembly 24. Each set of variable tie-up assemblies 25 includes two tie rods 251, two connecting seats 254, and two connecting shafts 253. The two tie rods 251 are arranged in an X-shape. A rotating shaft 252 is rotatably connected to the center of the two tie rods 251. The two connecting seats 254 are symmetrically arranged and connected to the upper side of the base plate 22 and the lower side of the support plate 26, respectively. The two connecting shafts 253 are horizontally arranged and rotatably connected to the two connecting seats 254, respectively. The two ends of the connecting shafts 253 are symmetrically provided with forward threads and reverse threads. Slider 255s are threadedly connected to both the forward and reverse threads. The four sliders 255 are respectively hinged to the upper and lower ends of the two tie rods 251.

[0082] In this embodiment, the variable tie assembly 25 is mainly used to maintain the spatial posture of the support plate 26 and prevent the limiting assembly 24 from shifting or twisting after the segment beam 9 slides into the bottom plate 51. The two sets of variable tie assemblies 25 are symmetrically arranged along the transverse axis of the support plate 26. The top and bottom of the variable tie assembly 25 are respectively tied to the top surface of the bottom plate 22 and the bottom surface of the support plate 26. The left and right sliders 255 are symmetrically arranged along the longitudinal axis of the bottom plate 22 and the support plate 26. In use, the left and right sliders 255 are driven to move in opposite directions by rotating the connecting shaft 253, thereby adjusting the tie state of the variable tie assembly 25 and keeping it locked in real time. Then, the middle segment beam 9 is hoisted and directly slid into the guide beam plate. The scissor brace restricts the horizontal movement of the support plate 26 during the gravity transmission process while preventing the first screw 241 from tilting under horizontal force. Stability is maintained by ensuring that the device is axially compressed.

[0083] Example 8:

[0084] The basic content is the same as Example 7, except that:

[0085] See Figure 10 One end of the connecting shaft 253 has a mounting hole 256 radially provided, and a rotating rod 257 is connected in the mounting hole 256. The connecting seat 254 includes two symmetrically arranged connecting blocks 2541. A bushing 258 is sleeved in the middle of the connecting shaft 253. The bushing 258 is stepped and is rotatably connected between the two connecting blocks 2541, with the stepped surface abutting against the side of the connecting block 2541.

[0086] In this embodiment, sliders 255 with positive and negative nuts are installed at both ends of each connecting shaft 253. The sliders 255 are respectively hinged to the round holes at both ends of the pull rod 251. The opening in the middle of the pull rod 251 is rotatably connected through the rotating shaft 252. The rotating rod 257 can be inserted through the mounting hole 256. When adjusting the state of the variable tie assembly 25, the sliders 255 are moved horizontally in opposite directions by rotating the rotating rod 257 vertically. The support plate 26 is parallel to the base plate 22 and remains stable by forming a real-time self-locking scissor brace.

[0087] Example 9:

[0088] The basic content is the same as in Example 1, except that:

[0089] See Figure 3 and Figure 8 The first guide beam assembly 4 includes two first guide beam plates 41 and a bracket 42. The two first guide beam plates 41 are symmetrically installed on the upper side of the fixing device 1. A gap 43 matching the width of the segment beam 9 is provided between the two guide beam plates. The bracket 42 is connected to the upper side of the fixing device 1 and arranged relative to the bottom end of the segment beam 9. A first stiffening plate 44 is connected between the bracket 42 and the fixing device 1.

[0090] The second guide beam assembly 5 includes a beam base plate 51 for bearing the weight of the segment beam 9. The beam base plate 51 is vertically installed on the upper side of the horizontal axis of the positioning adjustment device 2. The left and right sides of the beam base plate 51 are symmetrically provided with second guide beam plates 52 for guiding the segment beam 9 to slide in. A second stiffening plate 53 is connected between the beam base plate 51 and the positioning adjustment device 2.

[0091] In this embodiment, both the first guide beam plate 41 and the second guide beam plate 52 are right-angled trapezoids with sharp corners removed. The hypotenuses of the first guide beam plate 41 and the second guide beam plate 52 are symmetrically inward and the length of the upper base is not less than two-thirds of the height of the segment beam 9. The bracket 42 is in the shape of a straight line and parallel to one axis of the pad plate 11. The top side of the bracket 42 abuts against the bottom end of the arch foot segment beam 9. The bottom side of the bracket 42 is connected to a first stiffening plate 44, which is connected to the pad plate 11. Since the bracket 42 adopts a straight line design, it can support the arch foot segment beam 9 while making its beam end bottom directly reach the design elevation. There are two first stiffening plates 44, which are symmetrically arranged. The two first stiffening plates 44 are connected to the bottom of the bracket 42 to prevent the bracket 42 from deforming under stress.

[0092] Example 10:

[0093] The basic content is the same as Example 9, except that:

[0094] See Figure 5 and Figure 11Fine-tuning components 6 are symmetrically installed on the first guide beam plate 41 and the second guide beam plate 52. The fine-tuning components 6 include an angle steel 62, a fine-tuning screw 63, and a top beam plate 64. The angle steel 62 is connected to the side of the first guide beam plate 41 and the second guide beam plate 52. The fine-tuning screw 63 is threaded to the angle steel 62. The top beam plate 64 is rotatably connected to one end of the fine-tuning screw 63 and is arranged relative to the side of the segment beam 9.

[0095] In this embodiment, by installing plastic anti-collision sliders 61 on the first guide beam plate 41 and the second guide beam plate 52, it is possible to prevent the surface of the beam from scratching when the beam is segmented. By installing a fine-tuning structure on the side of the guide beam plate, the top beam plate 64 is moved by rotating the fine-tuning screw 63, thereby driving the first guide beam plate 41 and the second guide beam plate 52 to move laterally. This prevents the outer surface size from becoming too large or slightly deformed during the pouring of the concrete beam segment, which would prevent the beam from being dropped. It also enables horizontal fine-tuning during the beam dropping process to ensure that the beam segment axis is in place and that the axis is under stress.

[0096] Example 11:

[0097] The basic content is the same as in Example 1, except that:

[0098] See Figure 12 The high-altitude suspended monitoring prism 3 includes a switch magnetic base 31, a horizontal positioning component 32, a suspension positioning component 33, and a prism lens 34. The bottom of the switch magnetic base 31 is magnetically connected to the side of the segment beam 9. The bottom of the horizontal positioning component 32 is rotatably connected to one side of the switch magnetic base 31 and is arranged perpendicular to the bottom of the switch magnetic base 31. The suspension positioning component 33 is rotatably connected to the top of the horizontal positioning component 32. A plumb bob 35 is connected to the lower side of the suspension positioning component 33. The prism lens 34 is connected to the upper side of the suspension positioning component 33 and its axis coincides with the axis of the plumb bob 35. The front of the prism lens 34 is arranged opposite to the total station.

[0099] In this embodiment, the switch magnetic base 31 includes a magnetic conductor 311, a soft magnetic body 312, and a permanent magnet 313. The two magnetic conductors 311 are symmetrically arranged and each has a cavity 314 inside. The soft magnetic body 312 is connected inside the cavity 314. The permanent magnet 313 is rotatably connected between the two soft magnetic bodies 312. A shaft 315 is connected to the middle of the permanent magnet 313. One end of the shaft 315 passes through one of the magnetic conductors 311 and is connected to a handle 316. A gap is provided between the two soft magnetic bodies 312 and the magnetic conductors 311, and the gap is filled with copper. Plate 317, the inner side of soft magnet 312 is arc-shaped, two soft magnets 312 and copper plate 317 together form a cylindrical inner cavity 318, permanent magnet 313 is long and rotatably connected in the cylindrical inner cavity 318, the thickness of permanent magnet 313 matches the thickness of copper plate 317; handle 316, used to drive permanent magnet 313 to rotate so that the two ends of permanent magnet 313 contact copper plate 317 or soft magnet 312 respectively; the bottom of switch magnetic base 31 is symmetrically provided with second oblique convex shoulder grooves 319 along the longitudinal and transverse central axes respectively;

[0100] The soft magnet 312 is a ferrite material that is easily magnetized and demagnetized under a weak magnetic field. The copper plate 317 is not magnetic. When the handle 316 is turned, the permanent magnet 313 will rotate, which can change the direction of the magnetic field. The magnetic lines of force form a closed loop from the N pole of the permanent magnet 313 to the soft magnet 312 to the segment beam 9, and then from another soft magnet 312 to the S pole of the permanent magnet 313. At this time, the magnetic force quickly magnetizes and attracts the iron parts on the segment beam 9 through the soft magnet 312. After hoisting, the permanent magnet 313 inside the rotating switch magnetic base 31 is reset. At this time, the N and S poles of the permanent magnet 313 are facing the copper plate 317, the magnetic lines of force are broken, and the magnetic force quickly demagnetizes through the soft magnet 312. The magnetic force is switched on and off by changing the direction of the permanent magnet 313 by rotating the handle 316. Therefore, it can be quickly attracted and removed from the parts that need high-altitude operation monitoring.

[0101] The permanent magnet 313 is elongated, and its elongated design results in very little magnetism in the center of the permanent magnet 313, while the two ends of the permanent magnet 313 have strong magnetism. The permanent magnet 313 is rotated by turning the handle 316. When the two poles (N or S) of the permanent magnet 313 are in the vertical direction, the soft magnet 312 is magnetized and can be attracted to the surface of the segment beam 9 through the magnetic conductor 311. When the two poles (N or S) of the permanent magnet 313 are in the horizontal direction, the two poles of the permanent magnet 313 will contact the copper plate 317, the soft magnet 312 is demagnetized, and there is almost no magnetic force on the magnetic conductor 311, so it can be easily removed from the surface of the segment beam 9.

[0102] Example 12:

[0103] The basic content is the same as that of Example 11, except that:

[0104] See Figure 14The horizontal positioning component 32 includes a mounting block 321 and a centering rod 322. The mounting block 321 is vertically connected to one side of the switch magnetic base 31, and the centering rod 322 is vertically connected to the center of the mounting block 321. The center of the centering rod 322 passes through the transverse central axis of the switch magnetic base 31. A pointed tip 323 is connected to the bottom of the centering rod 322. The pointed tip 323 is located on the positioning hole of the central axis of the segment beam 9. The suspension positioning component 33 is rotatably hinged to the outer peripheral surface of the centering rod 322.

[0105] In this embodiment, after marking the positioning axis of the segment beam 9, a positioning hole is punched by punching a pin, and the horizontal positioning component 32 is aligned with the positioning hole of the segment beam 9. At this time, the horizontal positioning component 32 will automatically be perpendicular to the side of the segment beam 9. The bottom through hole 231 of the mounting block 321 is tapped to form a second threaded hole 324. One end of the centering rod 322 is provided with a pointed tip 323, which is conical. The other end of the centering rod 322 is a slot 326. The pointed tip 323 on the centering rod 322 is screwed into the mounting block 321 by a slotted screwdriver so that the bottom of the pointed tip 323 is exposed. At the same time, the large end of the stepped shaft 325 is exactly abutting the top of the mounting block 321.

[0106] During monitoring, the tip 323 of the centering rod 322 is aligned with the positioning hole of the segment beam 9, and the switch magnetic base 31 is attracted to the segment beam 9. After releasing the hand, the centering rod 322 is firmly fixed in its original position. Since the axis of the centering rod 322 is perpendicular to the bottom of the switch magnetic base 31, and the tip 323 of the centering rod 322 is pressed into the positioning hole, the automatic centering of the point to be measured is completed. Since the bottom of the switch magnetic base 31 is attracted to the surface to be measured, the centering rod 322 is automatically perpendicular to the point to be measured. Since the reflection center of the prism lens 34 and the axis of the plumb bob 35 are on the same vertical line, the prism lens 34 always remains in a vertical position under the action of the weight of the plumb bob 35, which facilitates the total station to track and monitor.

[0107] Example 13:

[0108] The basic content is the same as Example 12, except that:

[0109] See Figure 14 The suspension positioning assembly 33 includes a spherical bearing 331, a nut 332, a hanger rod 333, and a second screw 336. The inner ring of the spherical bearing 331 is fitted onto the centering rod 322. The nut 332 is threadedly connected to the centering rod 322 and one end face abuts against one end of the inner ring of the spherical bearing 331. The central axes of the second screw 336 and the hanger rod 333 pass through the center of the ball of the spherical bearing 331 and are respectively connected to the upper and lower sides of the outer ring of the spherical bearing 331. The plumb ball 35 is connected to the lower end of the hanger rod 333. The prism 34 is connected to the upper end of the second screw 336 and its central axis passes through the center of the ball of the spherical bearing 331.

[0110] In this embodiment, a spherical bearing 331 is fitted onto the stepped shaft 325 at the tail of the centering rod 322. Then, a nut 332 is tightened at the tail of the spherical bearing 331 to press it down. Nuts 335 and lower nuts 334 are symmetrically welded to the upper and lower rings of the outer ring of the spherical bearing 331. The center of the lower nut 334 passes vertically through the central axis of the centering rod 322. Then, the upper nut 335 is rotatably connected to the prism lens 34 through the second screw 336. The lower nut 334 is rotatably connected to the suspension rod 333. The lower part of the suspension rod 333 is connected to the plumb bob 35. Since the nut 332 presses the spherical bearing 331 down to the stepped shaft 325, the lateral distance from the center of the spherical bearing 331 to the measured part is fixed. Since the reflection center of the prism lens 34 and the axes of the suspension rod 333 and the plumb bob 35 are on the same vertical line, the prism lens 34 always remains in a vertical position under the action of the weight of the plumb bob 35.

[0111] Example 14:

[0112] The basic content is the same as Example 13, except that:

[0113] See Figure 14 The mounting block 321 has a second threaded hole 324 horizontally opened at its center. The outer circumferential surface of the centering rod 322 is connected to a stepped limiting shaft 325. The centering rod 322 is threaded to the second threaded hole 324. The large end of the stepped limiting shaft 325 abuts against one side of the mounting block 321, and the small end of the stepped limiting shaft 325 abuts against the other end of the inner ring of the spherical bearing 331.

[0114] In this embodiment, after connecting the stepped limiting shaft 325, the center of the ball of the spherical bearing 331 is fixed under the clamping force of the nut 332. Under the gravity of the plumb bob 35, the reflection center of the prism 34 will pass through the center of the ball of the spherical bearing 331 and always remain vertical. Automatic forced centering can be achieved by aligning the tip 323 with the positioning hole on the central axis of the segment beam 9. At the same time, after the centering rod 322 is threadedly connected to the mounting block 321, the axial limiting of the centering rod 322 can be achieved by the stepped limiting shaft 325. The spherical bearing 331 can enable the prism 34 and the plumb bob 35 to rotate around their center during the automatic plumb line process. The nut 332 axially limits the spherical bearing 331 to prevent the axial movement of the spherical bearing 331 from affecting the detection accuracy of the prism 34. The second screw 336 and the hanging rod 333 are both connected to the spherical bearing 331 by threaded connection, which facilitates the installation and replacement of the second screw 336 and the hanging rod 333.

[0115] Example 15:

[0116] A method for high-altitude axis positioning of the arch ring of a segmental assembled arch bridge, which is applied to the arch ring installation and positioning system of a segmental assembled arch bridge described in Example 5, includes the following steps:

[0117] Using a total station, the longitudinal and transverse centerlines of the bottom end face of segmental beam 9 are laid out on arch seat 8 and cross lines are drawn. Then, using the cross lines as a reference, the frame lines of fixing device 1 are drawn. Fixing device 1 is then installed so that the longitudinal and transverse centerlines of fixing device 1 coincide with the cross lines and the sides are aligned with the frame lines. At the same time, the planar position and elevation of fixing device 1 are adjusted. Based on the manufacturing error of the bottom end of segmental beam 9, the first guide beam assembly 4 is finely adjusted to limit the horizontal position of segmental beam 9, ensuring that the centerline of segmental beam 9 reaches the design position after it is lowered. After the adjustment is completed, fixing device 1 is fixed on arch seat 8. The three-dimensional coordinates of fixing device 1 are measured by the monitoring prism 7 on the first guide beam assembly 4 as the initial displacement value.

[0118] After obtaining the elastic and inelastic deformation of the working platform 21 through pre-compression, the positioning adjustment device 2 is placed on the working platform 21 by marking lines. The base plate 22 is leveled by using shims. Then, the reflecting prism is placed at the center of the second guide beam assembly 5. The three-dimensional coordinates of the reflecting prism are measured using a total station so that the transverse centerline of the second guide beam assembly 5 is directly below the design centerline of the segment beam 9. Then, the positioning adjustment device 2 is firmly connected to the working platform 21. The top surface elevation of the second guide beam assembly 5 is made to reach the bottom design elevation of the segment beam 9 by using the lifting assembly 23. Then, it is locked by the limiting assembly 24. The three-dimensional coordinates of the positioning adjustment device 2 are measured by the monitoring prism 7 on the second guide beam assembly 5 as the initial displacement value.

[0119] The segmental beam 9 is hoisted using lifting equipment. The position of the central axis of the segmental beam 9 is monitored in real time by the high-altitude hoisting monitoring prism 3. When it reaches directly above the fixing device 1 and the positioning adjustment device 2, the beam is lowered, allowing it to automatically slide into place along the inclined surfaces of the first guide beam assembly 4 and the second guide beam assembly 5, respectively. At the same time, the three-dimensional coordinates of the monitoring prism 7 on the fixing device 1 and the positioning adjustment device 2 are measured by a total station to obtain the offset of the beam's central axis during the lowering process. If the error exceeds the limit, the planar position and elevation of the central axis at both ends of the segmental beam 9 are adjusted by adjusting the fixing device 1 and the positioning adjustment device 2, respectively, so that the spatial position of the central axis of the segmental beam 9 directly reaches the design value.

[0120] In this embodiment, the theoretical position of the fixing device 1 is adjusted by the central axis of the segmental beam 9. Then, by using a crane to lift the arch foot and place it directly on the fixing device 1, the central axis plane and elevation of the bottom end of the segmental beam 9 can directly reach the design position, and the fixing device 1 can be permanently placed on the arch seat 8 for positioning. Simultaneously, the beam end axis is positioned by placing the positioning adjustment device 2 at the other end of the arch foot, the middle segment, or both ends of the arch crown. Using a total station, the positioning adjustment device 2 is moved below the central axis of the segmental beam 9. Then, the top surface elevation of the beam bottom plate 51 reaches the design elevation of the bottom of the segmental beam using the lifting assembly 23, and finally, the positioning assembly... 24. Locking is performed. The position of the central axis of the segment beam 9 is monitored by the high-altitude hoisting monitoring prism 3 to facilitate unmanned hoisting. The spatial displacement values ​​of the fixing device 1 and the positioning adjustment device 2 are measured by the monitoring prism 7. The fine adjustment component 6 is set on the first guide beam assembly 4 and the second guide beam assembly 5. The fine adjustment component 6 can adjust the horizontal position of the first guide beam assembly 4 and the second guide beam assembly 5, thereby adjusting the horizontal position of the central axis at both ends of the segment beam 9. By using the leveling component 13, the lifting component 23 and the fine adjustment component 6 to finely adjust the spatial position of the central axis at both ends of the segment beam 9, it can be ensured that the segment beam 9 reaches the design position for axial load bearing.

[0121] Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A segmental arch bridge arch ring installation positioning system, characterized in that, include: The system includes a fixed device (1), a working platform (21), a positioning adjustment device (2), two monitoring prisms (7), a high-altitude hoisting monitoring prism (3), a first guide beam assembly (4), and a second guide beam assembly (5). The fixed device (1) is installed on the arch seat (8). The first guide beam assembly (4) and the second guide beam assembly (5) are respectively installed on the upper side of the fixed device (1) and the positioning adjustment device (2) and are respectively arranged relative to the bottom end and the top end of the segmental beam (9). The two monitoring prisms (7) are respectively installed on one side of the first guide beam assembly (4) and the second guide beam assembly (5). The high-altitude hoisting monitoring prism (3) is connected to the central axis of the side of the segmental beam (9). The fixing device (1) is used to adjust and fix the planar position and elevation of the bottom end of the segmental beam (9); The positioning adjustment device (2) is used to adjust the planar position and elevation of the second guide beam assembly (5) so that the planar position and elevation of the top of the segment beam (9) reach the design position, and to perform spatial docking positioning of the two ends of the subsequent node beam (9). The high-altitude hoisting monitoring prism (3) is used to monitor the spatial axis position of the segment beam (9) during installation in real time; The first guide beam assembly (4) is used to contact the bottom end of the temporary fixed segment beam (9) via a three-sided line; The second guide beam assembly (5) is used to contact the top of the temporary fixed segment beam (9) or both ends of the subsequent segment via a three-sided line; The two monitoring prisms (7) are used to monitor the spatial positions of the fixing device (1) and the positioning adjustment device (2) in real time, respectively.

2. The arch ring installation positioning system of a segmentally assembled arch bridge according to claim 1, characterized in that: The fixing device (1) includes a pad (11), a fixing component (12), and a leveling component (13). The lower side of the pad (11) is connected to the arch seat (8) through the fixing component (12). The leveling component (13) is located between the pad (11) and the arch seat (8) and is used to adjust the spatial position of the pad (11) to spatially limit the bottom end of the segmental beam (9).

3. The system for positioning the arch ring of a segmental arch bridge according to claim 2, wherein: The leveling assembly (13) includes multiple leveling screws (131). The pad (11) has first threaded holes (113) that correspond one-to-one with the multiple leveling screws (131). The multiple leveling screws (131) are threadedly connected to the multiple first threaded holes (113) and their bottom ends abut against the upper end face of the pre-embedded steel plate of the arch seat (8).

4. The arch ring installation and positioning system for a segmental assembled arch bridge according to claim 1, characterized in that: The positioning adjustment device (2) includes a working platform (21), a base plate (22), a lifting assembly (23), and a limiting assembly (24). The base plate (22) is placed on the working platform (21). The lifting assembly (23) is installed on the upper side of the base plate (22) and its output end is connected to a support plate (26). The support plate (26) is located on the upper side of the base plate (22). The limiting assembly (24) is located on the upper and lower sides of the support plate (26) and is used to mechanically limit the support plate (26) after the lifting assembly (23) lifts the support plate (26) to the design elevation.

5. The system for positioning the arch ring of a segmental arch bridge according to claim 4, wherein: Two sets of variable tie-up assemblies (25) are provided between the lifting assembly (23) and the limiting assembly (24). Each set of variable tie-up assemblies (25) includes two tie rods (251), two connecting seats (254), and two connecting shafts (253). The two tie rods (251) are arranged in an X-shape. A rotating shaft (252) is rotatably connected to the center of the two tie rods (251). The two connecting seats (254) are symmetrically arranged and respectively connected to the upper side of the base plate (22) and the lower side of the support plate (26). The two connecting shafts (253) are horizontally arranged and respectively rotatably connected to the two connecting seats (254). The two ends of the connecting shafts (253) are symmetrically provided with forward threads and reverse threads. Slider blocks (255) are threadedly connected to both the forward threads and the reverse threads. The four sliders (255) are respectively hinged to the upper and lower ends of the two tie rods (251).

6. The arch ring installation positioning system of a segmentally assembled arch bridge according to claim 1, characterized in that: The first guide beam assembly (4) includes two first guide beam plates (41) and a bracket (42). The two first guide beam plates (41) are symmetrically installed on the upper side of the fixing device (1). A gap (43) matching the width of the segment beam (9) is provided between the two first guide beam plates (41). The bracket (42) is connected to the upper side of the fixing device (1) and arranged relative to the bottom end of the segment beam (9). A first stiffening plate (44) is connected between the bracket (42) and the fixing device (1).

7. The system for positioning the arch ring of a segmental arch bridge according to claim 6, wherein: The second guide beam assembly (5) includes a beam bottom plate (51) for bearing the weight of the segment beam (9). The beam bottom plate (51) is vertically installed on the upper side of the horizontal axis of the positioning adjustment device (2). The left and right sides of the beam bottom plate (51) are symmetrically provided with second guide beam plates (52) for guiding the segment beam (9) to slide in. A second stiffening plate (53) is connected between the beam bottom plate (51) and the positioning adjustment device (2).

8. The system for positioning the arch ring of a segmental arch bridge according to claim 7, wherein: Fine-tuning components (6) are symmetrically installed on the first guide beam plate (41) and the second guide beam plate (52). The fine-tuning components (6) include an angle steel (62), a fine-tuning screw (63), and a top beam plate (64). The angle steel (62) is connected to the side of the first guide beam plate (41) and the second guide beam plate (52). The fine-tuning screw (63) is threaded to the angle steel (62). The top beam plate (64) is rotatably connected to one end of the fine-tuning screw (63) and is arranged relative to the side of the segment beam (9).

9. The segmental arch bridge arch ring installation positioning system of claim 5, wherein: The high-altitude hoisting monitoring prism (3) includes a switch magnetic base (31), a horizontal positioning component (32), a suspension positioning component (33), and a prism lens (34). The bottom of the switch magnetic base (31) is magnetically connected to the side of the segment beam (9). The bottom of the horizontal positioning component (32) is rotatably connected to one side of the switch magnetic base (31) and is arranged perpendicular to the bottom of the switch magnetic base (31). The suspension positioning component (33) is rotatably connected to the top of the horizontal positioning component (32). A plumb bob (35) is connected to the lower side of the suspension positioning component (33). The prism lens (34) is connected to the upper side of the suspension positioning component (33) and its axis coincides with the axis of the plumb bob (35). The front of the prism lens (34) is arranged relative to the total station.

10. A method for high-altitude axis positioning of the arch ring of a segmental assembled arch bridge, characterized in that: This high-altitude axis positioning method is applied to the arch ring installation and positioning system of a segmental assembled arch bridge as described in claim 4. The high-altitude axis positioning method includes the following steps: Using a total station, the longitudinal and transverse centerlines of the bottom end face of the segmental beam (9) are laid out on the arch seat (8) and cross lines are drawn. Then, the frame lines of the fixing device (1) are drawn with the cross lines as a reference. The fixing device (1) is then installed so that the longitudinal and transverse centerlines of the fixing device (1) coincide with the cross lines and the side is aligned with the frame lines. At the same time, the plane position and elevation of the fixing device (1) are adjusted. Then, the first guide beam assembly (4) is adjusted to limit the horizontal movement of the segmental beam (9) to ensure that the centerline of the segmental beam (9) reaches the design position after the beam is lowered. After the adjustment is completed, the fixing device (1) is fixed on the arch seat (8). The three-dimensional coordinates of the fixing device (1) are measured by the monitoring prism (7) on the first guide beam assembly (4) as the initial displacement value. After obtaining the elastic and inelastic deformation of the working platform (21) through pre-compression, the positioning adjustment device (2) is placed on the working platform (21) by drawing a line. The bottom plate (22) is leveled by shims. Then the reflecting prism is placed at the center of the second guide beam assembly (5). The three-dimensional coordinates of the reflecting prism are measured by a total station so that the transverse centerline of the second guide beam assembly (5) is located directly below the design centerline of the segment beam (9). Then the positioning adjustment device (2) is connected to the working platform (21). The top surface elevation of the second guide beam assembly (5) is made to reach the bottom design elevation of the segment beam (9) by the lifting assembly (23). Then it is locked by the limiting assembly (24). The three-dimensional coordinates of the positioning adjustment device (2) are measured by the monitoring prism (7) on the second guide beam assembly (5) as the initial displacement value. The segment beam (9) is hoisted using a lifting device. The position of the central axis of the segment beam (9) is monitored in real time by a high-altitude hoisting monitoring prism (3). When it reaches the top of the fixing device (1) and the positioning adjustment device (2), the beam is lowered so that it slides into place automatically along the inclined surfaces of the first guide beam assembly (4) and the second guide beam assembly (5). At the same time, the three-dimensional coordinates of the monitoring prism (7) on the fixing device (1) and the positioning adjustment device (2) are measured by a total station to obtain the offset of the central axis of the beam when it is lowered. When the error exceeds the limit, the plane position and elevation of the central axis of the segment beam (9) at both ends are adjusted by adjusting the fixing device (1) and the positioning adjustment device (2) so that the spatial position of the central axis of the segment beam (9) directly reaches the design value.

Images