The largest luffing-jib tower crane from Linden Comansa, Model LCL700 is has just been erected in downtown Seattle (Washington), USA. Linden Comansa America (LCA) recently supplied a unit of this luffer and a flat top model 21LC550 20t to GLY Construction for the Rufus 2.0 Block 21 site. This project will include two office buildings (24 and 8 stories tall respectively) and is part of Amazon?s urban campus, which already hosts more than 40,000 employees in the city centre.

The design of the LCL700 and the different features that come as standard were key in this agile erection. The LCL700 is delivered from the factory with pre-assembled luffing reeving, allowing the erectors to work faster and reduce the erection time. The crane also includes a support winch, used to lift and put in place the auxiliary ropes of the jib, or to displace and install the heavy reeving pulleys without needing the support of a mobile crane, among other functions.

The team consisting of technicians from Linden Comansa?s headquarters in Spain and Linden Comansa America, working with the local erectors from Northwest Tower Crane, made easy work assembling such a large crane well within time allotted.

The crane was erected with full jib of 65 m (213.3 ft) and initial tower height of 20.3 m (66.9 ft), but it will be climbed to a final freestanding height of 60 m (196.9 ft). In this jobsite, the LCL700 will be used with single line pull, to lift maximum loads of 32 tonnes (70,550 lb), but a simple manual change to double line system could make this crane load up to 64 tonnes (141,090 lb).