Bridge Rotation Spherical Hinge 4m 14500 Ton Road-Railway Overpass Project Spherical Hinge Processing and Construction

1. Pre-construction Preparation:

   • Design Review: Verify the dimensions, load-bearing capacity, installation position, and other parameters of the spherical hinge according to the design drawings to ensure compliance with design requirements.
   • Material Inspection: Check the appearance quality of the spherical hinge, sliding materials, traction equipment, etc., to ensure there are no defects such as cracks, deformation, or corrosion.
   • Foundation Treatment: Clean the installation foundation of the spherical hinge, Bridge Rotation Spherical Hinge 4m 14500 Ton Road-Railway Overpass Project Spherical Hinge Processing and Construction
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     ensuring the foundation surface is flat, clean, and free of debris and oil stains.

2. Spherical Hinge Installation:

   • Lower Spherical Hinge Installation: Precisely install the lower spherical hinge at the designated position, Bridge Rotation Spherical Hinge 4m 14500 Ton Road-Railway Overpass Project Spherical Hinge Processing and Construction
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     use a level to adjust its horizontality, ensuring the error is within the allowable range.
   • Sliding Material Laying: Lay sliding materials (e.g., PTFE plates) on the surface of the lower spherical hinge, ensuring they are flat and free of wrinkles.
   • Upper Spherical Hinge Installation: Install the upper spherical hinge on the lower one, ensuring the central axes of both hinges are aligned, with the error controlled within the design tolerance.
   • Temporary Fixation: After installation, temporarily fix the upper spherical hinge, Bridge Rotation Spherical Hinge 4m 14500 Ton Road-Railway Overpass Project Spherical Hinge Processing and Construction
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     to prevent displacement during subsequent construction.

3. Traction System Installation:

   • Traction Equipment Layout: Symmetrically arrange traction equipment (e.g., jacks, steel strands) on both sides of the bridge to ensure even distribution of traction force.
   • Reaction Seat Installation: Install reaction seats to ensure the traction system's reaction force is effectively transmitted to the substructure.
   • Traction System Debugging: Debug the traction system to ensure smooth and synchronized operation.

4. Rotation Construction:

   • Trial Rotation: Perform a trial rotation before the formal rotation to check the rotational performance of the spherical hinge, synchronization of the traction system, and stability of the bridge.
   • Formal Rotation: Activate the traction system to slowly and steadily rotate the bridge to the design position. Monitor the bridge's posture and the spherical hinge's status in real-time during rotation.
   • Precise Positioning: When the bridge is close to the design position, use fine-tuning devices for precise positioning to ensure the error is within the allowable range.

5. Post-construction Inspection:

   • Spherical Hinge Status Check: After rotation, inspect the spherical hinge for abnormal deformation, wear, or damage.
   • Bridge Position Acceptance: Measure the final position of the bridge to ensure it meets design requirements.
   • Bridge Fixation: After the bridge is in place, permanently fix it to ensure stability.

III. Precautions

1. Precise Installation: The installation accuracy of the spherical hinge directly affects the success of the bridge rotation. Installation errors must be strictly controlled.
2. Sliding Material Protection: Avoid contamination or damage to sliding materials (e.g., PTFE plates) during construction to ensure smooth rotation.
3. Monitor Rotation Process: Continuously monitor the bridge's posture, rotation speed, and synchronization of the traction system during rotation to prevent accidents.
4. Environmental Factors: Avoid rotation construction under adverse weather conditions such as strong winds, rain, or snow to ensure safety.

IV. Common Issues and Solutions

1. Unsteady Rotation: This may be due to uneven laying of sliding materials or lack of synchronization in the traction system. Bridge Rotation Spherical Hinge 4m 14500 Ton Road-Railway Overpass Project Spherical Hinge Processing and Construction
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   Inspect and adjust the sliding materials and traction system.
2. Spherical Hinge Jamming: This may be caused by damaged sliding materials or impurities entering the hinge. Clean the hinge and replace the sliding materials.
3. Bridge Deviation: If the bridge deviates during rotation, it may be due to uneven traction force or inadequate monitoring. Adjust the traction force promptly and enhance monitoring.