For crossing main-waterways with roads or to connect different waterlevels the shiplift is useful.
The by Van Driel Mechatronica BV developed and patented shiplift is an alternative for a ship lock.
The water-filled dock of the VDM-shiplift is cable stayed and hanged on high positioned bearings.
The bearings are mounted upon two riding pilons.
The pilons ride with rubber wheels of slide on two carriage ways with gentle slopes.
These ways cross lower level roads, dams or other obstacles.
The slopes span the two waterlevels.
The dock has an electronic regulable velocity and is safed against swinging.
In many cases the shiplift can be balanced with counterweights, or executed in double version, so that only friction energy has to be delivered. In occuring cases the friction energy can be lowered by liquid layers. These high pressure waterlayers slide over the carriage ways.
The used energy during the lifting can partly be re-delivered during descending. Hollow carriage ways
can be used for water transport and energy supply.The dock-length can be useful for long inland waterway container combination ships and for sea-going ships of the type Cape Size of 300x50x18 meters.
Wide docks can be locked up with a water / air filled inflatable weir. By moving these weirs unto the ship, the consumption of water can be reduced.
When a ship with shallow draught passes, the weirs can be lifted partly, so that the salt intrusion can be reduced.
A dock can be transported empty (without water) too.