The importance of carrying out bearing and expansion joint inspections by proficient and competent engineers who understand their functionality can often be key to maximising a structure’s lifespan and avoiding major, unexpected, emergency repair costs.
USL Ekspan have carried out a number of projects for swing bridges and foot bridges. From design, fabrication of all structural components, to trial erection and final installation. Details of these type of bridge installations can be supplied on request.
The DLR Canning Town Flyover was constructed as part of the 3-Car Capacity Enhancement Project to serve Canning Town high-level DLR station, taking the Beckton line over the City Airport and Canning Town low-level DLR station lines. It is formed from a number of different structures connected by a continuous in-situ reinforced concrete deck measuring a length of 330m. The flyover’s location is close to and within the influence zone of Crossrail’s construction works being carried out at the Limmo Peninsular site. Here two deep, large diameter shafts provide access to twin bored Eastern Running tunnels that lead towards Victoria Dock Portal.
Permanent bearing works removal
USL Ekspan’s Workscope
As part of Crossrail’s C305 Eastern Running Tunnels contract, Canning Town Flyover had to be temporarily supported on hydraulic jacks while the tunnelling operations were completed.
To achieve this permanent bearings were removed and temporary bearings installed on top of vertical and horizontal jacks, thus allowing structure articulation to be maintained and monitored throughout the tunnelling works.
USL Ekspan were contracted by Mabey Hire Services to design and supply temporary bearings, remove permanent bearings, refurbish the permanent bearings and re-install these following the completion of Crossrail’s tunnel boring activities and including the associated settlement period.
The project required working to an engineering hours programme and works sequence to maintain full uninterrupted operation of the DLR, therefore strategic planning coupled with sequential methodology was crucial in successfully achieving this.
USL Ekspan’s successful delivery of this challenging and exceptionally complicated project is attributed to completing the works on time and in line with the main contractor’s tunnelling programme, without causing delays or disruption to the commuting public or to the tunnel construction works beneath. Open collaboration and close communication with contractors was also key to the success of the project.
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