There are many situations where conventional cranage is not the best option for lifting or moving heavy items. The load and reach may be outside the capacity of available cranes or there may not be space to assemble/stand a heavy crane. In these situations it can be economic to use a specially designed piece of heavy lifting equipment. We have encountered many such construction projects and as a result have developed a skill in the design and supply of purpose built mechanised erection systems, both large and small, including bridge deck erection gantries, component handling systems and heavy lifting towers.
If you have a particular need to handle large or heavy items on your site we will be pleased to advise on the most economic overall solution for your project.
Recent examples of our work include the following projects........
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 erectuion 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.
With a main span of 1088m the Sutong Cable stayed bridge is the longest span cable stayed bridge in the world. DLTwere sub-contractors to 2nd Navigation Engineering Bureau for the design, supplyand 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>
The DL-TS3000 Mk1 jacking tower system is owned and operated by DLT and can lift vessels up to 3000 tones and 150m high. It is able to self erect and dismantle and with the optional DL-TF1500 is able to operate without a tailing crane. It can operate unguyed up to 70m high in storm wind of up to 40 m/sec. All components are transported in standard shipping containers for economic relocation between sites. Download duty chart>
The DL-900/33 span erector has recently been designed by us to erect standard 900 tonne precast concrete deck girders on the planned high speed rail lines that will be built to link many of the main cities in China over the next few years. The gantries will be manufactured in China by our partner, Wuhan Bridge Machinery Co. The DL-SE 900/33 has been designed for quick and simple operation and is capable of erecting one span every 3.5 hours. The gantry can be launched forward or backwards, can easily be turned through 180 degrees to reverse the construction direction and utilises the delivery trailer to move between separate sections of viaduct without the need to dismantle and re-assemble the gantry.
Runyang
suspension bridge, China. Deck erection gantries.
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 the detailed design of the 4 No deck erection gantries that were used to erect the 1000 tonnes deck units of this 1377m span suspension bridge. We also supplied the strand jack systems used by the gantries for lifting the deck units and for gantry movement along the cables.
Formosa
Plastics Plant, Taiwan. Jacking tower system.
DLT were responsible for the design, supply & operation of a 100m high modular jacking tower system for the erection of 36 petrochemical vessels ranging from 1120 tonne at 30m high through to 1550 tonne at 115 m high. More>
DLT were responsible for the design, supply & operation of a 100m high modular jacking tower system for the erection of 36 petrochemical vessels ranging from 1120 tonne at 30m high through to 1550 tonne at 115 m high. More>
2500
tonne strand jack tower system, China
DLT were responsible for the conceptual and detailed design of this 2500 tonne lifting capacity modular strand jack tower system, specifically designed for the Chinese refinery construction market. The tower system is owned and operated by the No 4 Construction company of SINOPEC and has many new features including self-erection and luffing under full load. More>
DLT were responsible for the conceptual and detailed design of this 2500 tonne lifting capacity modular strand jack tower system, specifically designed for the Chinese refinery construction market. The tower system is owned and operated by the No 4 Construction company of SINOPEC and has many new features including self-erection and luffing under full load. More>
Westrail
track slab handling gantries, Hong Kong
DLT were responsible for the design and supply of 2 No track slab handling gantries for the West Rail project. The gantries was capable of handling two 6 tonne track slabs at a time and were designed to run along the track derailment kerbs. More>
DLT were responsible for the design and supply of 2 No track slab handling gantries for the West Rail project. The gantries was capable of handling two 6 tonne track slabs at a time and were designed to run along the track derailment kerbs. More>
Heat
exchanger replacement gantry, Indonesia
DLT were responsible fore the design, supply and operation of a 60 tonne capacity gantry to replace 2 No 60 tonne heat exchangers from deep within a steel framed structure on PT Peni’s site in Indonesia. Use of these purpose designed gantries in place of conventional cranage avoided the need to extensively dismantle the steel structure to gain access to the vessels, saving time and money.
DLT were responsible fore the design, supply and operation of a 60 tonne capacity gantry to replace 2 No 60 tonne heat exchangers from deep within a steel framed structure on PT Peni’s site in Indonesia. Use of these purpose designed gantries in place of conventional cranage avoided the need to extensively dismantle the steel structure to gain access to the vessels, saving time and money.
The new airport passenger bridge at Gatwick Airport, UK, spans 128m across a busy taxi way. To reduce disruption to the airport, the bridge was assembled off site, complete with cladding and internal fit out and then transported and erected in a 10 day closure of the taxi-way. DLT were responsible for the detailed design of a pair of 1640 tonne capacity gantries for lifting the completed bridge into final position, weighing 2,660 tonnes. The bridge was lifted using 8 No 410 tonne capacity strand jacks and the gantries were constructed from a modified proprietary jacking tower system. More>
DLT were responsible for the design of a 2300 tonne lifting capacity lifting gantry for handling cut sections of the Brent Spar as it was decommissioned in a Norwegian fjord in 1999. The gantry used 4 No 580 tonne capacity strand jacks for lifting and a gripper jack system for longitudinal movement over the decommissioning barge. The legs and cross beams of the gantry structure were made from a proprietary tower system which were connected and braced using purpose designed steelwork.
DLT are experienced in design of various forms of concrete bridge deck erection gantry. This picture (click to enlarge) shows one of our tender designs, for a self launching bridge deck erection gantry for erection of precast concrete segments on the 75m approach spans to the Sutong cable stayed bridge. The gantry was designed to handle precast concrete segments weighing up to 160 tonnes each, which were erected by the balanced cantilever method, and to suspend a half span of segments adjacent to deck movement joints weighing up to 1100 tonnes. The gantry was designed to handle deck longitudinal gradients of +/- 3%, deck plan minimum curvature of 950m and to skid sideways to erect adjacent box girders.