Mechanical Engineering, bridge bearings, structural engineering Specialists In Structural Movement Control
Mechanical Engineers Specialising In Structural Movement Control
Supplied: Refurbishment of Pipeline
Bearings (1998-2004) and
Expansion Joints (1986)
M1 Tinsley Viaduct - Strengthening & Upgrading
The Tinsley Viaduct is the countrys first-ever double-deck steel box girder bridge. As such it was a UK pioneering project when built in the 1960s with a troubled history and numerous engineering reviews and actions.
Darlington based bridge builder Cleveland Bridge UK Ltd commenced the building programme in 1965 after winning the contract on price against an alternative pre-stressed concrete design. Although the first cars passed over the lower deck of the viaduct in March 1968 it was to be more than a decade before Tinsley was fully opened to traffic on both decks. Only two years later, the year 1970 was disastrous for steel box girder bridges. Two collapses prompted more stringent design standards and between 1976 and 1980 a series of inverted triangular trusses were added to strengthen the viaducts main piers.
Introduction of European regulations in 1999, required that all highway structures should be able to carry 40-tonne vehicles. The viaduct failed to meet the new standard so the Highways Agency promptly reduced traffic to two lanes.
The current main contract includes reinforcing Tinsleys superstructure, piers and parapets, removing the structures toxic lead-based paint and providing a permanent hard shoulder for the M1 on the upper level. Completion is due late 2004.
Job Brief
Background Information
Project Team
Clients: Highways Agency, Yorkshire Water
Design Consultants: Owen Williams Ltd
Main Contractor: Edmund Nuttall Ltd
Sub Contractors: Cleveland Bridge UK, Ekspan Ltd.
Start Date: 1986
Completion Date: 2004
Being close to the Sheffield factory, work on the viaduct is not new to Ekspan.
Expansion joints at the road surface allow movement between consecutive bridge spans or between span and abutment. The Tinsley Viaduct has large roller shutter type expansion joints- on two levels with 650mm movement. These endure after being refurbished by Ekspan 17 years ago.
Perhaps less generally known is the fact that the viaduct carries both gas and water mains pipelines under the lower deck that are supported by special bearings. These too must allow complex differential movement In 1998, Ekspan acting as principal for Transco, designed, manufactured and installed new bearings for the gas main pipeline on the viaduct. The bearings had to accommodate the thermal expansion effects of both the bridge and the gas in the pipeline.
Temporary TV telemetry was installed to monitor relative movements of the pipeline to bridge deck and pipeline to ground. This enabled continuous monitoring and validation of performance of the bearings against calculations as installation progressed over the length of the structure.
During the current strengthening works on the viaduct, Ekspan was awarded the contract to refurbish the water main pipeline bearings. Working with Yorkshire Water, consultants Owen Williams and Cleveland Bridge, Ekspan has undertaken the work for removal, refurbishment and re-installation of the pipeline bearings.
This has required a close cooperation with the steelworks contractor to complete the work in sequenced phases as new cantilever structures were added to the decks. The whole structure is articulated upon Glacier Bearings. This range is now manufactured and supplied with full service from Ekspan Ltd. from plants in Sheffield and Ilminster.
Ekspan Returns to Tinsley