Patent EA-021802-B1 (EA)
Title: Method to perform underwater technical works during installation of bulk items and device for its realisation
Inventor: POKHABOV VLADIMIR IVANOVICH
IPC: E02D29/09
Filed: 2012-05-26
Abstract: The invention relates to pyrotechnic construction, particularly to construction of berths, underwater enclosing structures, artificial islands and underwater protective structures in a shelf area. Technical result is optimisation of a technology and reduction of costs of the underwater technical works during installation of bulk objects and structures. In order to achieve it, the method for execution of the underwater technical works during installation of the bulk objects, which involves delivery of the object in the form of a box caisson to the place of installation, its flooding and assembly, according to the invention, is performed using a floating facility of a twin-hull type. With that, the barge with the box caisson of full availability is driven in the water area in the space between pontoons of the floating facility of a twin-hull type, the box caisson is lifted with the help of its weight-lifting facilities, the unloaded barge is driven from the space between the pontoons to the water area, the box caisson is lowered for its installation onto extended elements, the specified elements are extended with the help of a drive, and the box caisson is rested onto them. The floating facility with the box caisson is delivered to the place of works execution, the floating facility is moored, and the box caisson is flooded and installed using weight-lifting facilities that are installed at the floating facility. The method can apply box caissons provided with recesses-seats interacting with their corresponding extended elements of the floating facility. In the floating facility of a twin-hull type used for implementation of the method, which includes pontoons connected to each other and provided with weight-handling and weight-lifting mechanisms arranged between them, according to the invention, pontoons (1) are combined into a twin-hull ship with metal frame structures (2) with a possibility of location between them of a barge with box caisson (3). In nose and aft parts of the floating facility there installed are removable transition bridges (4). The housing of each of the pontoons is provided with structures with extended half beam elements (5) located in the upper part and/or at the bottom of the pontoon housing and controlled hydraulic or mechanical servo motors with their appropriate drives. Metal frame structures are provided with polyspast suspensions (18) and pulling winches (19) forming a lifting and traction system. On the deck of the floating facility there installed are mooring winches (20). The structure with extended half-beam element (5) controlled by a hydraulic servo motor is provided with guide (7) made in the pontoon structure, in which half-beam (5) is installed. The guide is tightly connected to end wall (8) of hydraulic cylinder (9), and moving stock (10) of the hydraulic cylinder with piston (11) is connected to half-beam (5). With that, hydraulic cylinder (9) is connected to a liquid supply system to its cavities, which contains delivery pump (12) and elements of the liquid supply system to cavities of the hydraulic cylinder.