Lifting device for use in construction of civil work e.g. dam, has vertical projection comprising end portion with lower part provided outside part of contact places of chassis, where vertical projection extends across plane of base

摘要

The device (100) has a grid comprising an end portion with a vertical projection extending across a plane of a base, and a support structure rotating along a vertical spin axis by a swivel. The support structure has a lifting arm that extends up to the swivel. The mass center of gravity of the lifting device is located within joint contact areas. A lower part of an end portion of the projection is provided outside a part of contact places (118, 119) of a chassis.