Swivel bridge high-precision spherical hinge construction method

Abstract

According to the swivel bridge high-precision spherical hinge construction method, a steel bar system is arranged at the bottom of a spherical hinge framework, vertical bars are embedded and fixedly connected with the steel bar system to improve the stability of the spherical hinge framework, and meanwhile vertical fixed supporting is provided for a lower spherical hinge support through embedded vertical I-shaped steel; the inclined I-shaped steel is arranged between the lower spherical hinge support and the vertical I-shaped steel to provide lateral support for the lower spherical hinge support, so that the impact resistance of the bearing platform during secondary concrete pouring is improved, and a stable foundation is provided for high-precision mounting of the spherical hinge; fine fine adjustment can be carried out on the lower spherical hinge support through the fine adjustment bolt, it is guaranteed that the lower spherical hinge support has high levelness, the split structure formed by the lower spherical hinge and the lower spherical hinge support reduces the hoisting weight of the spherical hinge, safety is high, the lower spherical hinge and the lower spherical hinge support are fixed in a butt joint mode through the butt joint structure of the cross key groove and the cross key, and the lower spherical hinge and the lower spherical hinge support are fixed in a butt joint mode. Through the combination of the measures, the installation precision of the lower spherical hinge is effectively improved, and the construction quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of bridge construction, and in particular to a high-precision spherical joint construction method for a rotating bridge. Background Art

[0002] Rotating bridge construction utilizes the inherent rotation of the bridge structure. It is primarily used for crossing deep valleys, rivers, railways, highways, and other locations where support is unavailable. This method involves fabricating (casting or splicing) the bridge structure off-axis, then rotating it to the designed position using a rotating system and closing it to form the bridge. This method is widely used in bridge construction due to its rapid construction, minimal impact on the surrounding environment, and cost savings.

[0003] The swivel bridge ball joint is a key component in the construction of bridge rotation. Its design, manufacture and installation are crucial to the safety and stability of the bridge. The swivel bridge ball joint is mainly composed of a lower ball joint, an upper ball joint, a hinge rod (support shaft) and other components. The lower ball joint and the upper ball joint are in contact with each other through smooth spherical surfaces, and can rotate with each other to realize the rotation function of the bridge. The hinge rod is used to connect the outer ball and the inner ball and transfer the load. The invention patent with publication number CN106192766A discloses an existing commonly used swivel device. The lower ball joint of the existing swivel device is usually fixed directly to the concrete seat by bolts. The horizontal adjustment is relatively troublesome and the adjustment accuracy is not high, which affects the installation accuracy of the lower ball joint. After the ball joint is installed, it must be fixed with concrete pouring. The lateral pressure generated by the concrete pouring will cause an impact on the ball joint, which will also affect the accuracy of the ball joint installation position, thereby affecting the quality of the subsequent rotation construction, and needs to be improved. Summary of the Invention

[0004] In order to solve the above problems, the present invention proposes a high-precision spherical joint construction method for a rotating bridge.

[0005] The technical solution of the present invention is: a high-precision spherical joint construction method for a rotating bridge,

[0006] ① Dig a deep foundation pit in the foundation at the location of the rotating bridge pier, cast the cap in the deep foundation pit, and evenly embed several vertical I-beams in the middle area of ​​the cap, with the upper ends of the vertical I-beams extending upward from the cap; ② Use the hoisting method to place the ball hinge frame horizontally on the pedestal in the vertical I-beam area. After adjusting the elevation, weld the legs of the ball hinge frame to the vertical I-beam. ③ Evenly connect several nut seats of the same specifications on the upper frame plane of the ball joint frame, and vertically install fine-tuning bolts in the nut seats;

[0007] ④ Install the center axis in the center of the lower ball joint support, and set a long groove in a cross shape on the surface. Insert a key into the long groove. Lift the lower ball joint support and place it between the upper end faces of the fine-tuning bolts of the ball joint frame. Adjust the lower ball joint support to align with the ball joint frame to achieve preliminary positioning. ⑤Screw each fine-tuning bolt in turn, and use an electronic level and a total station to monitor the elevation and levelness of the lower ball joint support. Use these fine-tuning bolts to accurately level the lower ball joint support. ⑥ After the elevation error of the lower spherical joint support is adjusted to less than 1mm, add inclined I-beams at the four corners of the spherical joint support. The upper end of the inclined I-beam is welded and fixed to the spherical joint support, and the lower end is welded and fixed to the embedded vertical I-beam. The lower spherical joint support is fixed; ⑦ Roughen the area where the spherical hinge skeleton is placed on the surface of the cap, and then pour C50 micro-expansion concrete into the deep foundation pit to cast the cap for the second time, pouring it close to the upper surface of the lower spherical hinge support;

[0008] ⑧ Set a cross-shaped keyway on the bottom surface of the lower ball joint, then hoist the lower ball joint above the lower ball joint support, slowly lower it and insert the center hole of the lower ball joint into the center shaft, use the cross-line alignment method to match the keyway to the key on the surface of the lower ball joint support, and weld the fine-tuning bolt after checking the accuracy. ⑨ Roughen the surface of the second-cast foundation and pour concrete into the deep foundation pit again until the concrete is flush with the top surface of the lower spherical joint; ⑩ Install the numbered PTFE slides one by one on the surface of the lower ball joint, ensure that the PTFE slides are located on the same spherical surface, and apply butter and PTFE powder on the surface of the lower ball joint; then hang the upper ball joint above the lower ball joint, slowly lower it and insert the center blind hole of the upper ball joint into the upper end of the center shaft, ensure that the centers of the upper and lower ball joints correspond, and complete the positioning and installation of the upper ball joint.

[0009] Preferably, in step ①, a number of vertical bars are evenly arranged in the reinforcement system of the pedestal, and after the pedestal is cast, these vertical bars extend upward from the surface of the pedestal.

[0010] Preferably, after the ball joint frame is installed in step ②, a cross-staggered steel bar system is woven between the bottom of the ball joint frame and the base, and the steel bar system is fixedly connected to the reserved vertical bars by welding or binding.

[0011] Preferably, the vertical I-beam in step ① is welded and fixed to the transverse reinforcement of the foundation pit reinforcement system, and auxiliary I-beams are welded and fixed around the vertical I-beam, and the lower end of the auxiliary I-beam extends to the bottom of the pedestal.

[0012] Preferably, after the upper ball joint of step ⑩ is installed, butter is added between the edges of the upper ball joint and the lower ball joint, and then an anti-corrosion sealing strip is wrapped around the outer side of the joint for sealing.

[0013] Preferably, circular vibration holes are provided on the four sides and the middle of the lower ball joint support.

[0014] Preferably, the ball hinge frame is a square frame structure, including an upper frame and a lower frame, the upper frame and the lower edge are fixedly connected as a whole by vertical legs, and auxiliary reinforcement rods are provided at the corners of the ball hinge frame.

[0015] Preferably, after the upper ball joint is positioned and installed in step ⑩, the upper ball joint is rotated clockwise or counterclockwise, and the traction lock is used to correct the deviation of the upper ball joint and the lower ball joint.

[0016] The beneficial technical effects of the present invention are: 1. The present invention adds a fine-tuning bolt to the ball joint frame, and the fine-tuning bolt can be used to fine-tune the lower ball joint support to ensure that the lower ball joint support has a high levelness. The split structure composed of the lower ball joint and the lower ball joint support reduces the weight of the ball joint hoisting, has high safety, and is conducive to position adjustment during the hoisting process. The docking structure of the cross keyway and the cross key docks and fixes the lower ball joint and the lower ball joint support to ensure the stability of the two in the circumferential direction after docking. The combination of these measures effectively improves the installation accuracy of the lower ball joint and ensures the construction quality.

[0017] 2. The present invention sets a steel bar system at the bottom of the ball joint frame, and pre-buries vertical bars to fix the steel bar system to improve its stability. At the same time, the pre-buried vertical I-beams provide vertical fixed support for the lower ball joint support, and the inclined I-beams are set between the lower ball joint support and the vertical I-beams to provide lateral support for the lower ball joint support, thereby improving the impact resistance of the pedestal during the second pouring and concreting, and providing a stable foundation for the high-precision installation of the ball joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the ball joint device; Figure 2 yes Figure 1 AA-direction cross-sectional structural diagram; Figure 3 It is a schematic diagram of the three-dimensional structure after the ball joint frame and the lower ball joint support are connected; Figure 4 This is one of the three-dimensional structural diagrams of the lower ball joint; Figure 5 This is the second schematic diagram of the three-dimensional structure of the lower ball joint; Figure 6 It is a schematic diagram of the three-dimensional structure of the ball joint skeleton; Figure 7 Schematic diagram of the structure after the ball joint frame is installed; Figure 8 This is a schematic diagram of the structure after a cross-staggered steel bar system is set at the bottom of the ball joint frame; Figure 9 This is a schematic diagram of the structure after the lower ball joint support is installed and the inclined I-beam is set; Figure 10 yes Figure 9 BB-direction cross-sectional structural diagram; Figure 11 This is a structural diagram after the second pouring of the cap and the installation of the lower spherical joint; Figure 12 This is a structural diagram after the foundation is poured three times and the spherical joint is installed; Figure 13 yes Figure 12 Schematic diagram of the top view structure; Figure 14 It is one of the working drawings of the present invention; Figure 15 It is the second construction drawing of the present invention.

[0019] In the figure, 11. deep foundation pit, 12. pedestal, 13. vertical I-beam, 14. vertical reinforcement, 02. ball joint frame, 21. upper frame, 22. lower frame, 23. support leg, 24. auxiliary reinforcement rod, 25. nut seat, 251. fine-tuning bolt, 03. lower ball joint support, 31. center axis, 32. key, 33. vibrating hole, 04. Lower ball joint, 41. PTFE sliding plate, 42. Center hole, 43. Keyway, 05. Upper ball joint, 51. Blind hole, 61. Grease and PTFE powder, 71. Cross-staggered reinforcement system, 72. Inclined I-beam. DETAILED DESCRIPTION

[0020] Example 1, see the attached Figure 1-13 A high-precision spherical joint construction method for a rotating bridge, the steps are as follows:

[0021] ① A deep foundation pit 11 is dug in the foundation at the pier position of the rotating bridge, and a pedestal 12 is cast in the deep foundation pit. A number of vertical I-beams 13 are evenly embedded in the middle area of ​​the pedestal. The upper ends of the vertical I-beams extend upward from the pedestal 12. A number of vertical bars 14 are evenly arranged in the reinforcement system of the pedestal 12. After the pedestal is cast, these vertical bars extend upward from the surface of the pedestal 12. The vertical bars 14 are threaded steel bars; and the vertical I-beams 13 are welded and fixed to the transverse steel bars of the foundation pit reinforcement system, and auxiliary I-beams are welded and fixed around the vertical I-beams. The lower ends of the auxiliary I-beams extend to the bottom of the pedestal 12, further improving the pre-embedded strength of the vertical I-beams 13.

[0022] ② The ball hinge frame 02 is placed horizontally on the pedestal 12 in the area of ​​the vertical I-beam 13 by hoisting. After adjusting the elevation, the legs 23 of the ball hinge frame are welded and fixed to the vertical I-beam 13. A cross-staggered steel bar system 71 is woven between the bottom of the ball hinge frame 02 and the pedestal. The steel bar system is fixedly connected to the reserved vertical bars 14 by welding or binding. The embedded vertical bars 14 firmly fix the steel bar system to the bottom of the ball hinge frame 02 to ensure the stability of the steel bar system during the secondary pouring of concrete.

[0023] ③ Evenly and securely connect several nut seats 25 of the same specifications on the plane of the upper frame 21 of the ball joint frame 02, vertically install fine-tuning bolts 251 in the nut seats, and adjust the height of the fine-tuning bolts in the nut seats 25 by tightening the fine-tuning bolts 251 with a wrench;

[0024] ④ Install the central axis 31 in the center of the lower ball joint support 03, and set a long groove in a cross shape on the surface. Insert the key 32 into the long groove. Lift the lower ball joint support 03 and place it between the upper end surfaces of the fine-tuning bolts 251 of the ball joint frame 02. Adjust the lower ball joint support to align with the ball joint frame 02 to achieve preliminary positioning. ⑤ Tighten each fine-tuning bolt 251 in sequence, and use an electronic level and a total station to monitor the elevation and levelness of the lower spherical joint support 03, and accurately level the lower spherical joint support 03 through these fine-tuning bolts; ⑥ After the elevation error of the lower ball joint support 03 is adjusted to less than 1mm, inclined I-beams 72 are added at the four corners of the ball joint support. The upper end of the inclined I-beam is welded and fixed to the ball joint support, and the lower end is welded and fixed to the pre-buried vertical I-beam 13. The lower ball joint support 03 is fixed. By arranging the inclined I-beam 72 between the lower ball joint support 03 and the vertical I-beam 13, lateral support is provided for the lower ball joint support, thereby improving the impact resistance of the base 12 during the secondary pouring and concreting; and vibrating circular holes 33 are provided around and in the middle of the lower ball joint support 03. When pouring concrete at the lower part of the lower ball joint support, a vibrating rod is inserted from the side of the support for vibration, and the vibrating rod is vertically inserted from the vibrating circular hole 33. During the vibration process, the gas and slurry inside are discharged from the vibrating hole, so that the lower ball joint support 03 is tightly poured in the concrete.

[0025] ⑦ Roughen the area on the surface of the cap 12 where the spherical hinge frame 02 is placed, then pour C50 micro-expansion concrete into the deep foundation pit 11 to cast the cap 12 for the second time, pouring it close to the upper surface of the lower spherical hinge support 03. The spherical hinge frame and the lower spherical hinge support 03 are cast and fixed in the cap 12;

[0026] ⑧ Set a cross-shaped keyway 43 on the bottom surface of the lower ball joint 04, then hoist the lower ball joint 04 above the lower ball joint support 03, slowly lower it and insert the center hole 42 of the lower ball joint into the center shaft 31, use the cross-line centering method to match the keyway 43 with the key 32 on the surface of the lower ball joint support 03, and after checking the accuracy, weld the fine-tuning bolt 251 to prevent the bolt from loosening due to vibration. Connect the ball joint support and the lower ball joint 04 through the cross-shaped key 32 and keyway 43, and limit the circumferential direction of the two to ensure the stability of the two after connection and casting; 9. Roughen the surface of the second-cast cap 12 and pour concrete into the deep foundation pit 11 again until the concrete is flush with the top surface of the lower spherical joint 04. Roughen the surface to improve the firmness of the connection between the upper and lower caps 12 after the second pouring, thereby improving the overall casting quality of the cap 12. ⑩ Install the numbered PTFE slides 41 one by one on the surface of the lower ball joint 04, ensuring that the PTFE slides 41 are located on the same spherical surface and the PTFE slides slightly protrude from the surface of the ball joint. Apply butter and PTFE powder 61 to the surface of the lower ball joint 04 to form a lubricant; then hang the upper ball joint 05 above the lower ball joint 04, slowly lower it and insert the center blind hole 51 of the upper ball joint into the upper end of the center shaft 31, ensuring that the centers of the upper ball joint 05 and the lower ball joint 04 correspond to each other, and complete the positioning and installation of the upper ball joint.

[0027] After the upper ball joint 05 in step ⑩ is installed, add butter between the edges of the upper ball joint and the lower ball joint 04, and then wrap the anti-corrosion sealing strip around the outer side of the joint to seal it to prevent external debris from entering the joint surface of the upper ball joint 05 and the lower ball joint 04, ensuring a smooth and easy-to-rotate contact surface between the two, and rotate the upper ball joint 05 clockwise or counterclockwise, and use the traction lock to correct the upper ball joint 05 and the lower ball joint 04.

[0028] The ball joint frame 02 in this embodiment is a square frame structure, including an upper frame 21 and a lower frame 22. The upper frame and the lower frame are both welded and fixed together by channel steel. The upper frame 21 and the lower edge are fixed together by vertical legs 23, and auxiliary reinforcement rods 24 are provided at the corners of the ball joint frame 02. The auxiliary reinforcement rods 24 not only form a triangular structure with the frame to support the reinforcement frame, but also are used to increase the bearing area of ​​the surface of the upper frame 21, which is beneficial to provide stable support for the ball joint support.

Claims

1. A high-precision spherical joint construction method for a rotating bridge, characterized by: Ball joint frame construction and installation ① Dig a deep foundation pit in the foundation at the location of the rotating bridge pier, cast the cap in the deep foundation pit, and evenly embed several vertical I-beams in the middle area of ​​the cap, with the upper ends of the vertical I-beams extending upward from the cap; ② Use the hoisting method to place the ball hinge frame horizontally on the pedestal in the vertical I-beam area. After adjusting the elevation, weld the legs of the ball hinge frame to the vertical I-beam. ③ Evenly connect several nut seats of the same specifications on the upper frame plane of the ball joint frame, and vertically install fine-tuning bolts in the nut seats; Installation and pouring of spherical hinge bearings ④ Install the center axis in the center of the lower ball joint support, and set a long groove in a cross shape on the surface. Insert a key into the long groove. Lift the lower ball joint support and place it between the upper end faces of the fine-tuning bolts of the ball joint frame. Adjust the lower ball joint support to align with the ball joint frame to achieve preliminary positioning. ⑤Screw each fine-tuning bolt in turn, and use an electronic level and a total station to monitor the elevation and levelness of the lower ball joint support. Use these fine-tuning bolts to accurately level the lower ball joint support. ⑥ After the elevation error of the lower spherical joint support is adjusted to less than 1mm, add inclined I-beams at the four corners of the spherical joint support. The upper end of the inclined I-beam is welded and fixed to the spherical joint support, and the lower end is welded and fixed to the embedded vertical I-beam. The lower spherical joint support is fixed; ⑦ Roughen the area where the spherical hinge skeleton is placed on the surface of the cap, and then pour C50 micro-expansion concrete into the deep foundation pit to cast the cap for the second time, pouring it close to the upper surface of the lower spherical hinge support; Ball joint installation and pouring ⑧ Set a cross-shaped keyway on the bottom surface of the lower ball joint, then hoist the lower ball joint above the lower ball joint support, slowly lower it and insert the center hole of the lower ball joint into the center shaft, use the cross-line alignment method to match the keyway to the key on the surface of the lower ball joint support, and weld the fine-tuning bolt after checking the accuracy. ⑨ Roughen the surface of the second-cast foundation and pour concrete into the deep foundation pit again until the concrete is flush with the top surface of the lower spherical joint; ⑩ Install the numbered PTFE slides one by one on the surface of the lower ball joint, ensure that the PTFE slides are located on the same spherical surface, and apply butter and PTFE powder on the surface of the lower ball joint; then hang the upper ball joint above the lower ball joint, slowly lower it and insert the center blind hole of the upper ball joint into the upper end of the center shaft, ensure that the centers of the upper and lower ball joints correspond, and complete the positioning and installation of the upper ball joint.

2. The high-precision spherical joint construction method for a rotating bridge according to claim 1 is characterized by: In step ①, a number of vertical bars are evenly arranged in the reinforcement system of the pedestal. After the pedestal is cast, these vertical bars extend upward from the surface of the pedestal.

3. The high-precision spherical joint construction method for a rotating bridge according to claim 2 is characterized by: Step ② After the ball joint frame is installed, a cross-staggered steel bar system is woven between the bottom of the ball joint frame and the base. The steel bar system is fixedly connected to the reserved vertical bars by welding or binding.

4. The high-precision spherical joint construction method for a rotating bridge according to claim 1 is characterized by: The vertical I-beam in step ① is welded and fixed to the transverse steel bars of the foundation pit reinforcement system, and auxiliary I-beams are welded and fixed around the vertical I-beam, and the lower end of the auxiliary I-beam extends to the bottom of the pedestal.

5. The high-precision spherical joint construction method for a rotating bridge according to claim 1 is characterized by: After the upper ball joint is installed in step ⑩, add butter between the edges of the upper ball joint and the lower ball joint, and then wrap the anti-corrosion sealing strip around the outer side of the joint for sealing.

6. The high-precision spherical joint construction method for a rotating bridge according to claim 1 is characterized by: Vibrating circular holes are provided around and in the middle of the lower ball joint support.

7. The high-precision spherical joint construction method for a rotating bridge according to claim 1 is characterized by: The ball hinge frame is a square frame structure, including an upper frame and a lower frame. The upper frame and the lower edge are fixedly connected as a whole through vertical legs, and auxiliary reinforcement rods are provided at the corners of the ball hinge frame.

8. The high-precision spherical joint construction method for a rotating bridge according to claim 1 is characterized by: After the upper ball joint is positioned and installed in step ⑩, rotate the upper ball joint clockwise or counterclockwise and use the traction lock to correct the deviation of the upper and lower ball joints.

Images