Search Results

The aim of this paper is to establish the design process of a system that expedites concreting, the Topbelt. Two connected conveyors that provide five degrees of freedom are known as the Topbelt System. These two conveyors are suspended via a rope connection to a Lattice boom of a crane, Manitowoc 4100 S. The required concrete that should be handled by Topbelt is provided by a feeder. The suspended Topbelt system is capable of transporting concrete to levels of both higher and lower than the ground horizontal level. This concreting mechanism sweeps a circle of about 85-meter diameter, centering at the crane swing on the swing plane level. The Topbelt is suspended using two winches, one of them is for keeping conveyor1 in its proper position and the other is applied to keep conveyor2 by a rope guide mechanism, which allows the rotational movement of conveyor2 with respect to conveyor1. Expediting concrete process in dam construction is the main advantages of the Topbelt system.

The aim of this paper is represented design and manufacturing process of change of functioning of a scrapped shovel (Ruston Bucyrus R32) to a lattice boom crane of 300-ton capacity. Capabilities of the structure, changed components, additional required components (e.g. boom, mast, winch…) and modifying critical dimensions of this shovel were surveyed. In this paper, some of the 300-ton capacity lattice boom cranes of various companies were considered and critical dimensions that play an important role in system stability were surveyed. After that, their major dimensions were compared with those of a common shovel. In order to design the structure and components of this shovel-based crane, static, dynamic and wind loads were calculated. Finally, the critical dimensions of the shovel related to chassis and crawler were modified. This crane was used for lifting heavy machineries in the right zone of the main body of Seymareh dam site (Ilam-Iran) and played a vital role on that project.