We offer a range of consultancy services for the design and construction of many types of structure, including bridges, buildings, heavy process plant, petrochemical vessels and offshore structures. We have particular expertise in the erection of long span suspension and cable stayed bridges, and in the engineering of specialist modular construction operations such as heavy lifting, lowering and horizontal skidding operations. All consultancy services are provided under our ISO 9001:2008 accredited quality management system and covered by professional indemnity insurance.
Recent examples of our consultancy work include the following projects………..
Northshore footbridge is a 2-span tied arch crossing the river Tees in Stockton, England. Main span is 120m, side span is 60m. The arches are steel box sections and the deck is made from precast concrete segments that are post tensioned together to form the arch ties. DLT provided expert advice to the disigners on erection methods and details for fabrication and buildability and provided full erection engineering to the contractor, including stage by stage analysis, aerodynamic response analysis and detailed design of all temporary works. More>
ChaoTianMen arch
bridge, Chongqing, China >>
The ChaoTianMen arch bridge crosses the Yangtze river in the city of Chongqin in South West China. It has a tied arch main span of 552m with continuous side spans of 190m, and has been designed to resemble the Sydney Harbour Bridge, completed by Dorman Long & Co. in 1932. DLT are acting as consultant to the main contractor, 2nd Navigation engineering Bureau and are responsible for developing and detailing the construction method to be used. On completion this will be the longest arch span in the world, a record currently held by the Lupu bridge in Shanghai (550m).
The ChaoTianMen arch bridge crosses the Yangtze river in the city of Chongqin in South West China. It has a tied arch main span of 552m with continuous side spans of 190m, and has been designed to resemble the Sydney Harbour Bridge, completed by Dorman Long & Co. in 1932. DLT are acting as consultant to the main contractor, 2nd Navigation engineering Bureau and are responsible for developing and detailing the construction method to be used. On completion this will be the longest arch span in the world, a record currently held by the Lupu bridge in Shanghai (550m).
<< Boyne
cable stayed bridge, Ireland
DLT were responsible for the design of the superstructure, as an alternative to the client’s design, detailed design of the erection methods for all elements of the deck and for supply and operation of the strand jacking systems used to launch the deck into final position .More>
DLT were responsible for the design of the superstructure, as an alternative to the client’s design, detailed design of the erection methods for all elements of the deck and for supply and operation of the strand jacking systems used to launch the deck into final position .More>
Heathrow
Airport, Terminal 5 building and air traffic control tower, UK >>
DLT were responsible for the detailed erection engineering for the 18,500 tonne steel roof structure of the new main core terminal building, and for a 1000 tonne air traffic control tower. Both were fabricated off-site and erected on-site using strand jack lifting systems. The roof box girders, purlins and cladding to the core terminal building roof was erected in 6 No 2,000 tonne lifts. The control tower was pre-assembled off-site into 7 fully complete modules and then assembled on-site using a unique vertical jacking technique. More>
DLT were responsible for the detailed erection engineering for the 18,500 tonne steel roof structure of the new main core terminal building, and for a 1000 tonne air traffic control tower. Both were fabricated off-site and erected on-site using strand jack lifting systems. The roof box girders, purlins and cladding to the core terminal building roof was erected in 6 No 2,000 tonne lifts. The control tower was pre-assembled off-site into 7 fully complete modules and then assembled on-site using a unique vertical jacking technique. More>
DLT were responsible for the detailed erection engineering for the 26,000 tonnes of structural steel, including stands, cable suspended roof and main arch structures. The 1,490 tonne main arch was assembled flat and rolled up into position using strand jacks. We were responsible for engineering and supervising this operation. More>
Runyang
suspension bridge, China >>
DLT were responsible for the design, supply and commissioning of 4 No 370 tonne capacity deck erection gantries for this 1490m main span suspension bridge. These gantries walk the main cables and work in pairs to erect steel deck units weighing up to 470 tonnes each. The gantries can be self erected onto the main cables and are easily adapted for future projects with different cable centres and diameter. More>
DLT were responsible for the design, supply and commissioning of 4 No 370 tonne capacity deck erection gantries for this 1490m main span suspension bridge. These gantries walk the main cables and work in pairs to erect steel deck units weighing up to 470 tonnes each. The gantries can be self erected onto the main cables and are easily adapted for future projects with different cable centres and diameter. More>
DLT were responsible for detailed construction engineering of the main cables, deck hangers and steel orthotropic deck. More>
Bishop's bridge replacement,
Paddington Station, London >>
DLT were responsible for conceptual and detailed design of all construction methods for replacement of the existing railway over bridges with a new six lane composite bridge, all of which took place within limited railway possessions. More>
DLT were responsible for conceptual and detailed design of all construction methods for replacement of the existing railway over bridges with a new six lane composite bridge, all of which took place within limited railway possessions. More>
DLT are responsible for the permanent works design and erection engineering for this landmark structure in the centre of Khartoum. The bridge has a main span of 210m and has been designed for construction by local labour. More>
El
Damar bridge, Sudan >>
El Damar Bridge will carry the new road currently being constructed between Atbara and Merowie in Sudan, over the River Nile, close to the town of El Damar. The Nile is over 850m wide at the bridge location, divided into two channels by an island midway between the banks. The deck will comprise 21 No. 40.9m span precast, post-tensioned T girders with insitu reinforced concrete slab. It will be supported on cross beams carried by circular reinforced concrete column bents and piled foundations. DLT are consultants for conceptual and detialed design of the bridge & foundations
El Damar Bridge will carry the new road currently being constructed between Atbara and Merowie in Sudan, over the River Nile, close to the town of El Damar. The Nile is over 850m wide at the bridge location, divided into two channels by an island midway between the banks. The deck will comprise 21 No. 40.9m span precast, post-tensioned T girders with insitu reinforced concrete slab. It will be supported on cross beams carried by circular reinforced concrete column bents and piled foundations. DLT are consultants for conceptual and detialed design of the bridge & foundations