The installation process of shield segment bolts is a key step in tunnel construction, which ensures the tight connection between segments and the overall stability of the tunnel. The following are the detailed steps of the shield segment bolt installation process:
1. Preliminary preparation
Confirm the segment installation equipment: Ensure that the segment installation equipment can work normally and the hydraulic and control systems are in good condition.
Prepare installation tools: such as pneumatic wrenches, tightening bolts, etc., and ensure that these tools are complete and in use.
Confirm the segment type and position: The relevant technicians determine the segment type and the circumferential position of the installation to ensure that the installation process meets the design requirements.
2. Segment installation
Place the segments: Place the segments on the segment transport trolley in the correct order and prepare for installation.
Start the equipment: Start the filter cooling pump, auxiliary pump, propulsion pump, segment installation machine pump and other equipment in sequence to ensure that they work normally.
Adjust the shield working mode: Switch the shield working mode to the segment installation mode and prepare for segment installation.
3. Bolt installation
Position the segments: Use the segment installation machine to accurately position the segments to the final position to ensure that the gaps between the segments are uniform.
Insert the bolts: Put the bolts in the holes where the bolts need to be installed and put on the nuts, but do not tighten them yet.
Tighten the segments: Extend the corresponding thrust cylinders to tighten the segments in place. There are at least two (pairs) of oil cylinders symmetrically tightening the segments on each A, B, and C segment to ensure the stability of the segments.
IV. Tighten the bolts
Use a pneumatic wrench: Tighten the bolts with a pneumatic wrench. The air pressure of the pneumatic wrench must meet the specified torque requirements.
Check the bolts: Make sure all bolts are tightened, and check for loose or damaged bolts. If necessary, replace them in time.
V. Subsequent work
Loosen the grab head: After completing the installation of a segment, loosen the grab head to install the next segment.
Record information: Enter the installation information of the segments of this ring into the guide system as needed for subsequent inspection and maintenance.
The above is the installation process of Shield segment bolts. Each step needs to be carried out strictly in accordance with the operating specifications to ensure the quality and safety of tunnel construction.
