Large -span tide -block sluice

The utility model provides a large -span tide -block sluice, including the gate, inside the gate, along the gate length direction on, arrange in proper order and be provided with the air chamber more than two, the top of each air chamber is passed through the pneumatic valve and is communicate to the air pump, and each air chamber bottom sets up with external intercommunication. By the utility model discloses, pouring into the air in to the air chamber into through the air pump, arranging the water in the outlet chamber, can reduce the whole density of gate, the drive of in -process, is closed at the tide -block sluice gate opening of being convenient for to increase buoyancy, through the air in the air pump run reverse row outlet chamber, in water entering air chamber, can increase the whole density of gate, reduce buoyancy, it can be stablized with regard to the bit position to the tide -block sluice gate of being convenient for after taking one's place.