Automatic underwater object positioning method and system

A method for positioning target under water automatically includes using wirerope on the ship to sink detection device down to water bottom at water area of target to be positioned and confirming its position through image; arranging sound wave receiversin linear array of intervals on water surface, launching sound wave to wards water surface by emitter; sending sound wave signal to computer for calculating out time difference, water depth and target water surface projection position value displayed in curve.

Precast concrete hinge drainage upper horizontal drawing continuous dredge construction method

Continuous prefabricated hinged concrete row drawing and depositing construction process

The present invention relates to a mattress contruction method of precast-concrete hinged mattress for bank protection, which is characterized by that connecting hinged ring and concrete plate to form mattress body unit, superposing the mattress body units on the fixed slideway of the mattress-splicing barge by layers, between mattress body units of every layer placing shiftable movable slideway, connecting the mattress-splicing barge with the outer side of mattress-sinking barge, using winding engineto horizontally pull the most upper mattress body unit onto the slideway of mattress-sinkingbarge, when the tail end of the most upper mattress body unit is shifted on the front end of second mattress body unit, removing slideway, and connecting their head and tail together, and can use mattress head keam to pull most upper second layer mattress body unit, and so on and so forth, can make all the connected mattress body units sink to underwater mud surface sequentially to implement mattress-sinking ...