Skanska and Hampshire council
SCOPE OF WORK:
Design, Fabricate and install structural steel supports to bridge columns.
Additional work: build a safer brick wall and paint affected rust areas with lead based paint.
Triangle worked closely with Hampshire council structural engineers and Skanska bridge team to complete this challenging task.
Firstly we removed as much rust as possible from the worst areas without taking away too much material. Painting the affected areas with the lead based paint had its own issues due to the risk of the soil around the site being contaminated. Fulfilling our environmental duties with the help of the environment agency requirements we sealed off the area with impermeable plastic sheeting to catch any rust or lead based paint falling. Operatives wore advanced air purifying masks and resistant overalls.
Secondly we built a new wall on the west side of the bridge to make it safer for motorists; in the event of an accident the vehicle would be deflected with the angle and not hit a solid wall.
The design of the steelworks was complicated as it went through the existing structure. We used our Leica total station to accurately survey the site before completing a 3D cad model with our advance steels software.
Site complications were due to the bridge itself leaving little room for lifting equipment, particularly at the rear of the columns. We used a telehandler to install the front of the steels and a 9 tonne winch to lift the rear sections.
Overall the project came in on time and the bridge is now safe for the rest of its life as the new bridge is due to be installed in the next 2 years.