METHOD TO PERFORM UNDERWATER TECHNICAL WORKS DURING INSTALLATION OF BULK ITEMS AND DEVICE FOR ITS REALISATION Russian patent published in 2013 - IPC E02D29/09 

FIELD: construction.

SUBSTANCE: method to perform underwater technical works during installation of bulk items includes delivery of an item in the form of a box caisson to the place of installation, its flooding and assembly with the help of a cargo barge and a floating lifting facility. Delivery is carried out using a double-hulled watercraft made as capable of placement of the loaded barge in the space between pontoons that form the double hull and are connected to each other with metal frame structures with weight-lifting facilities for lifting and lowering of the box caisson, and also equipped with structures having extended elements, providing for retention of the box caisson as it is delivered to the place of installation. The barge with the box caisson of full availability is driven in the water area in the space between pontoons of the double-hulled watercraft, the box caisson is lifted with the help of its weight-lifting facilities, the unloaded barge is driven from the space between the pontoons into 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 watercraft with the box caisson by self-motion or towing is delivered to the place of works production, the watercraft is moored, and the box caisson is flooded and installed by release from extended elements that retain it using weight-lifting facilities, which are installed on the watercraft.

EFFECT: optimised technology and reduced costs for production of underwater technical works during assembly of bulk items and structures.

7 cl, 5 dwg