Linden Comansa Tower Crane Works on Restoration Project in USA
The Capitol's cruciform floor plan, the presence of other structures of the complex around the building, an aggressive working schedule and the expenses of requiring multiple crawler cranes were a big challenge for the managers.
The best logistic solution has been a 21 LC 400 tower crane from Linden Comansa. It has been erected with a height under the hook of 103.8 meters (340 ft), and a jib length of 80 m (262 ft), allowing the operators to reach every spot of the jobsite, and to move the jib over the statue - a Native American archer from the Kansa tribe- that tops the dome at a height of 93m (304 ft).
To achieve such an impressive height without tying the crane to any other structure, a special configuration of the tower was designed: nine 4-meter-wide sections (13 ft), one transition section, and other nine 2.5-meter-wide sections (8 ft). Blake Graham, project manager with JE Dunn, has been informed that it is currently the tallest freestanding tower crane in North America.
Since the beginning of September, the crane, with 18 tonnes (39,683 lb) of maximum load and Flat-Top design, has been at hard work transporting materials required for the restoration around the perimeter of the dome. The Exterior Masonry project includes stone stabilization, crack repair, dutchman repairs, hand carving and others.
The 21 LC 400 crane, which will work for about a year on this project, is part of the JE Dunn’s fleet since 2006, and was sold by Linden Comansa America, subsidiary of Spanish manufacturer Linden Comansa.