We have considerable experience in the design and construction of all
types of bridges and civil structures. We have been involved in creating many of the world’s
best known bridges and have aprticular expertise in the construction of suspension and cable stayed bridges and in the design, supply and operation of bridge deck erection gantries. Whether you are looking for a designer or specialist
heavy lifting contractor, DLT are able to offer a comprehensive service.
Recent examples of our work include……….
The Ponte Sobre O Rio Negro is a 3505m long crossing of the Rio Negro in the heart of the Amazon rain forest, linking Manaus with Iranduba over the river Negro. DLT were awarded the contract to design, supply and operate 2 No 320 tonne capacity deck erection gantries to handle the 52 precast concrete deck sections of the cable stayed spans. More>>
The A34 Wolvercote viaduct in the UK carries a 4 lane highway across a river, a railway line and the A40. The existing structure was built in the early 1960's and now needs to be replaced. To minimise disprution to traffic a new east carriageway is constructed alongside the existing 4 lanes, followed by demolistion of the old east carriageway structure and skidding of the new structure across into final position. DLT are contracted by main contractor Costain Limited to design, supply and operate a hydraulic lifting and skidding system to move the 254m long, 4920 tonne new east carriageway the 16.6m from its construction postition into final position on 8 parallel skidding tracks. Skidding is due to take place in the spring of 2010.
<< E-Dong Cable Stayed Bridge, China
The E-Dong Cable Stayed Bridge is located in Huanggang city, Hubei Province, China, and crosses the Changjiang river. It has a main span of 926m and side spans of 275m, making it the third longest cable stayed bridge in the world. DLT were awarded the sub-contract by Second Highway Engineering Bureau to design a pair of 280 tonne capacity deck erection gantries to erect steel orthotropic deck segments weighing up to 369 tonnes each on one half of the main span. More>>
The other half of the deck was erected by Second Navigation re-using the deck erection gantries we supplied to them for the Sutong Bridge and the Shanghai Yantze Bridge.
Shanghai Yangtze Cable Stayed Bridge, China>>
The Shanghai Yangtze cable stayed bridge carries both road and rail traffic and has a main span of 730 m that crosses the navigational channel along the link between Shanghai and Chongming Island. DLT were awarded the sub-contract by Second Navigational Engineering Bureau to provide site supervision during erection of bridge deck units. Modified DLT deck erection gantries from the Sutong Bridge project were used to erect the 46 No steel orthotropic deck segments, each weighing up to 387 tonnes, from Jan-June 2008. More>
The Olmstead Locks and Dams project project consists of twin 110-foot wide by 1,200 foot long lock chambers located near the Illinois shoreline, on the Ohio River. The lock chambers are constructed from heavy precast concrete units, that will be cast in the shore and then handled on land using a purpose made gantry crane and in the water using a purpose made heavy lift catamaran barge. DLT have been awarded the contract to design, supply and operate 2 No 14,000 tonne capacity computer controlled strand jack systems for use as the main lifting systems on both the gantry crane and the catamaran barge. Delivery of these systems will be in 2010.
M74 Port Eglinton Viaduct launch >>
The Port Eglinton Viaduct carries a new 6 lane section of the M74 motorway over the West Coast Mainline railway in Glasgow, Scotland. It has a main span of 138m and a total length of 750m. A 200m length of each carriageway structure, weighing over 4000 tonnes, was launched 170m across the railway. The structures was moved by back-to-back 418t pulling and restraining strand jacks operatiing on a continuous cable running from one end of the launched structure to the other. The launch took place over a 16 day period in early 2010, working at night to minimise disruption to the railway line. More >>
The Xihoumen suspension bridget crosses the Xihoumen straight between the islands of Jintang and Cezi. It forms one part of a chain of bridges that link Zhoushan island to Ningbo, on the Chinese mainland to the south of Shanghai. It has a main span of 1650m and will be the second longest suspension bridge in the world when completed. DLT are the designers and suppliers of the deck erection gantries, which were originally used on the Runyang Bridge (more>) and have been modified for this project which has a different main cable spacing and diameter. 119 steel deck segments will be erected with these gantries. Maximum lift weight is 370 tonnes. DLT are also providing site supervision for the operation and maintenance of the gantries
The award wining Infinity 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 designers 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>
<< Sutong cable stayed bridge,
China. Deck erection & caisson lowering
With a main span of 1088m the Sutong Cable stayed bridge is the longest span cable stayed bridge in the world. DLT were sub-contractors to 2nd Navigation Engineering Bureau for the design, supply and operation of the eight deck erection gantries that were used to erect the 84 No steel orthotropic deck segments, each weighing up to 450 tonnes, between 9th November 2006 and 9th June 2007. More>
These gantries have since been used to erect the decks on two further bridges in China, the shanghai-Yangtze cable stayed bridge and the E-Dong cable stayed bridge. On the Sutong bridge, we were also responsible for lowering of a 3050 tonne caisson. More>
<< Shibanpo bridge,
Chongqing, China
DLT were the sub-contractors for the
erection of the three steel deck units forming the main 108m span of this
multi-span box girder bridge. Two 2.5m long concrete / steel transition
pieces, each weighing 100 tonnes, were erected first. This was followed
by the erection of the main 103m long steel centre section weighing 1325te.
The three lifts took place in May 2006. More>
Orinoco River Second
Crossing, Venezuela >>
At over 3km long and with two cable
stay spans of 300m, this project provides many engineering challenges. The
steel box girder deck for the 60m approach spans is being launched in pre-assembled
units of up to 2413 tonnes. The steel box girder deck of the two cable stay
main spans is being erected by balanced cantilever in 250 tonne segments
using specially designed deck erection gantries. DLT are responsible for
supply and operation of the strand jack systems for launching of the approach
spans and for lifting & skidding of the main span deck units. More>
DLT/FNP JV are acting as advisors to the Client on key technical issues regarding the design and construction of the central tower on this 3 tower, 2x1080m span, suspension bridge which is currently at the design stage. Our work includes advising on the rigidity of the four leg tower, the risk of main cable slip over the tower, bridge articulation, use of hydraulic dampers and movement limiting devices and seismic analysis and design.
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).
DLT were sub-contractors for erection of the 24 No. 700 tonne steel deck units, which was carried out in 2003 using a system of computer controlled strand jacks. The deck units were delivered directly to the bridge site by ship and lifted into final position using 4 No 290 tonne capacity strand jacks mounted on the deck units. DLT were also responsible for detailed construction engineering of the main cables, deck hangers and steel orthotropic deck. More>
DLT werey sub-contractors for design, supply and operation of strand jack and climbing jack systems for vertical lifting and horizontal skidding operations required to replace the existing railway over bridges with a new six lane composite bridge. DLT are also responsible for conceptual and detailed design of all construction methods, all of which take place within limited railway possessions. 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>
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 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 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
DLT were responsible for erection engineering of the bridge steel structure, involving offsite assembly of the 3000 tonne main span, transport to site and lifting in one piece into final position using 8 No 500 tonne capacity strand jacks. More>
DLT were responsible for detailed erection engineering, equipment supply and site supervision for deck erection on this 1385m main span suspension bridge. More>
DLT were responsible for detailed erection engineering, equipment supply and site supervision for deck erection on this 1377m main span suspension bridge. More>
DLT were responsible for the design, supply and operation of a 800 tonne capacity climbing jack system for the lifting and lowering of temporary formwork support trusses for the construction of 80m long in-situ post tensioned concrete approach spans. More>
DLT were responsible for value engineering of the permanent strengthening& widening works and conceptual and detailed design of all erection and demolition methods and related temporary works for carrying out this upgrade to the existing 335m span suspension bridge. More>
DLT were responsible for supply & operation of a strand jacking system to carry out replacement of the complete bridge deck in 54 sections, each within a 10 hour overnight closure of the bridge. 4 No DL-S60 strand jacks (plus 2 No spare jacks) with power and control system for a lifting speed of 60 metres per hour were supplied to the main contractor, American Bridge