Installing a lining trolley in a tunnel project is a complex and crucial process for the secondary lining of the tunnel. It involves careful planning, adherence to safety protocols, and precise execution.
I. Pre-Installation Planning and Site Preparation
Choose the Installation Location:
Outside the tunnel (preferred): If space allows, assemble the trolley outside the tunnel portal. This provides a larger, flatter, and more open area for crane operations, facilitating easier assembly and less constrained working conditions.
Inside the tunnel (if necessary): If outdoor space is limited, the trolley can be assembled inside the tunnel. This requires more precise planning and anchor operations due to confined spaces.
Site dimensions: The installation site should be as flat and wide as possible, typically around 20m x 30m. If installing inside the tunnel, ensure at least 50 cm clearance above the trolley and 30 cm on the sides. The length of the obstacle-free area should be at least twice the length of the trolley plus 3 meters for lifting operations.
Level the Site and Lay the Track:
The ground must be leveled and compacted to create a stable base for the tracks.
Lay the tracks according to the specific gauge requirements of the lining trolley.
Ensure the tracks are straight, free of triangular pits, and have no staggered seams.
Maintain a height difference of less than 5 mm between the front, rear, left, and right rails.
Align the track centerline as closely as possible with the tunnel centerline (error less than 15 mm).
Track sleepers should be spaced generally at 0.5 meters or less and securely nailed.
Use heavy steel rails (e.g., 38kg/m).
Pre-Operation Inspection & Safety Precautions:
Conduct a thorough inspection of all lining trolley components for any damage, wear, or malfunction.
Ensure all personnel are trained in safety procedures and equipped with appropriate PPE (helmets, gloves, safety harnesses).
Establish clear communication protocols and designated safety zones.
II. Assembly Steps (General Order)
Install the Walking Wheel Frame Assembly:
Use a lifting device (crane or chain block) to place the driving and driven wheel frames onto the laid tracks.
Provide temporary support and adjust the distance between the front and rear wheel frames according to the centerline of the bottom longitudinal beam.
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For more detailed information on the installation of lining trolleys in tunnelling projects visit: https://www.gf-bridge-tunnel.com/a/blog/installation-of-lining-trolleys-in-tunnel-project.html
