This pedestrian/cyclist swing bridge spans across the mouth of the Deptford Creek adjacent to the River Thames, in Greenwich London, and it provides an extension to the long distance walking route along the south bank of the Thames.
Qualter Hall were employed by Raymond Brown Construction Ltd to design, supply, install and commission the M&E equipment for operating and controlling the swing bridge, to allow the passage of marine craft through to the nearby cement works. The specification stated that all equipment supplied should be economical and low maintenance, designed in accordance with the latest specifications and codes. The bridge is now operated and controlled by Greenwich Borough Council.
The scope of supply included the following:
- Triple row slew bearing with an internal gear ring
- 4 no. electric inverter controlled gear units fitted with drive pinions, to provide a variable speed option
- Steel foundation frame for housing the above
- Nose wheels and fabricated ramps for aligning the bridge deck to the abutment
- Central nose bolt mechanism for locking the bridge
- Shock absorber and support bracket for consistent alignment of the bridge to the abutments either side
- Cable chain for controlling the movement of the services onto the bridge during rotation
- Main electrical MCC panel including PLC section, software by Qualter Hall
- Operators desk and radio pendant
- Local panels adjacent to the nose and pintle areas
- Parapet lighting
- Navigation lights
- Lightning protection
- Cabling of the electrical elements
After fabrication, all of the support steelwork for the mechanical equipment was shotblasted and painted using a glass flake system, which is suitable for a marine environment with low maintenance. Before delivery to site all the mechanical equipment was assembled within the Qualter Hall workshops to ensure component compatibility and provide an opportunity for client inspection.
The bridge is normally operated from the operators desk which is provided with a vandal resistant lockable cover and is located on the adjacent approach ramp. A radio pendant is also supplied for use during maintenance activities only. The bridge initially starts to rotate in creep speed first before accelerating to full speed for the majority of the cycle, before finally decelerating down to a controlled stop. The speed and angular rotation can be controlled and adjusted to suit site conditions, which was agreed during the final testing and commissioning phase.
Client: Raymond Brown Construction