McLean Contracting Company needed a high-reach floating crane to install offshore power line supports in Baltimore. The highest lift was 400 feet above water. Liftech evaluated the feasibility of retrofitting their 400T Baltimore floating crane with a long jib to perform the lifts. Liftech developed the design criteria, assisted with developing a conceptual jib erection scheme, reviewed crane system strength…
Category: Other Structures Projects
Moffett Field Hangar, Overall Project, Mountain View, California
At more than 1,000 feet long, 250 feet wide, and 170 feet tall each, two blimp hangars constructed in the 1940s at Moffett Field are among the world’s largest clear-span timber structures. One of these hangars had significant damage to many of its timber truss arches, and the damage was progressing along the length of the hangar to the extent that…
Moffett Field Hangar, Access Shoring Tower System, Mountain View, California
Liftech designed an access shoring tower system and strand jack assembling system. The access system is 80 feet x 80 feet x 130 feet tall. It is designed to shore and jack the hangar roof from its deck and facilitate access to the roof with an array of equipment on its deck including lifts and cranes. It is designed for asymmetric…
Moffett Field Hangar, Beam Jacking Procedure, Mountain View, California
A 20-foot-wide, 22-foot-tall, 200-foot-long wooden box beam above the hangar doors had deteriorated and sagged down onto the nested sliding door system. Liftech designed a jacking procedure and jacking system so Power could raise and repair the box beam. The jacking system included lifting and holding jacks. The lifting jacks had low friction bearings to allow the distorted box beam…
Price Systems Log Boom Crane
Liftech provided structural analysis and design for various rotating log boom cranes. The latest was for a 170-foot, 45-ton crane in Valliant, Oklahoma. Liftech also designed and prepared drawings for cranes with radii of 125 feet and 155 feet and capacities ranging from 25 tons to 60 tons. The grapples are either at a fixed radius or mounted on a moving trolley.
Antone Fatigue Investigation and Development of Structural Maintenance Program
This barge-mounted Liebherr 998 hydraulic excavator experienced significant fatigue cracking during normal operations. Liftech provided the following engineering services to mitigate the failure problem: Reviewed the existing structural details and then monitored the manufacturer’s modification of unacceptable fatigue details.
Baffle/Burner Support Structure
Liftech designed many baffle and burner support structures for Coen. The baffles and burners are located in power plant ducts. Often the baffles are designed as structural members that can support themselves and carry the loads of the burners.
Ro-Ro Ramp Design, Matson Navigation, Oakland and Hawaii
Matson retained Liftech to design roll-on, roll-off (ro-ro) ramps suitable for transporting automobiles and light trucks onto and off ships. Liftech provided analysis, design, and fabrication audit of the ramps, which were fabricated in China. We designed the primary structure, the articulation, structures to support the wheeled dollies, and collaborated with naval architects to design the ship interface structure. The ramps latch…