METHOD FOR LOWERING OF UNDERWATER LEVEL IN CONSTRUCTION AND OPERATION OF UNDERGROUND STRUCTURES LOCATED BELOW UNDERWATER LEVEL AND DEVICE FOR METHOD REALISATION Russian patent published in 2009 - IPC E02D27/10 

FIELD: construction.

SUBSTANCE: invention is related to the field of construction and operation of structures deepened in ground and located below level of underwater horizon. Method for lowering of underwater level in construction and operation of underwater structures installed below level of underwater, by means of layerwise pumping of underwater by pump with suction and discharge pipes from perforated pipes with further removal of dewatered layers of soil from underground structure. In every dewatered layer of soil trench is arranged previously, in which perforated drain pipe is installed, which is connected to suction pipe equipped with nozzle and gate protruding inside structure, then trench is filled with crushed stone, nozzle gate is closed, and water is pumped with further removal of dewatered soil layer, making these operations until project elevation is achieved, and then structure bottom is arranged. Also device is suggested for method realisation.

EFFECT: increased efficiency and reliability of artificial lowering of underwater level in construction and operation of underground structures installed below underwater level, and also in prevention of emergency high underwater extraction from soil of already built and operated underground structure.

4 cl, 1 ex, 1 dwg