Suction Pump Dredger Launching by Wire Loosing and Winding Method

Etsuro Moriyama, Akisuke Urata, Akinori Morimoto
1960 Journal of the Society of Naval Architects of Japan  
The three suction pump dredgers built at Hitachi Sakurajima Shipyard last year have adopted the new launching method called "Wire loosing and winding method", by launching her slowly with wires which is rather different from the common sliding method. The new method was adopted because : (1) The ship type is an Ark. (2) All the outfittings were installed on the building way and her launching weight will be about 1, 000 ton. (3) Having special apparatus as the suction ladder and spuds on her
more » ... and aft. Under these conditions, the authors have considered of using this new methods not to cause any damage to the ways and to the side walls, also not to change the sliding direction by water stopping resistance, tidal current and wind pressure that work unequally to each part of her. The launching way for the wire loosing and winding method was exactly the same as ordinary ships in using greases, but the chocking, loosing, winding and adjusting were all done from the ground by wires.
doi:10.2534/jjasnaoe1952.1960.107_303 fatcat:gxmhny7ph5ap3pi2nb3fnuskma