Slipway Winch

[BATAAN]

Here are some photos. Notice that large railways sometimes use chain for a hauling cable. The third shot of a 3 screw tug on the ways is a yard I worked in for many years.

[David7438]

Originally Posted by BATAAN

It depends. The usual ways csar is a flat platform of steel beams with a system of sliding or pivoting support arms.
When hauling a boat out, the vessel is gently guided over the ways car and tied to it, then the car is hauled up the track just a little, enough for the keel to touch, then the arms and supports are adjusted to keep the vessel upright, and then they are locked in place.
When all is secure, the car is slowly and carefully hauled up the track. Often additional shores are added after the boat is out.
A fitted cradle is not used on commercial haulouts in my experience.

Sorry! I am a junior about vessel operation. Can I ask some more simple questions? As follows:
1.How to guide the vessel over the ways car? Using tug boat? or drive in position by the vessel(Is it possible ,especially for large vessel)?
2.The arms and supports are adjusted by the divers?
Thanks for your reply.

[BATAAN]

Vessel is guided into place gently with ropes and small boats. Supports are usually arranged so no diver is required, as divers cost money.
This can either be pre-blocking to the plans of the vessel, or adjustable blocking or supports, usually operated with small hand winches and steel cable.
This all depends on the shape of vessel being hauled. Some are easy, some are difficult.
Google "marine railway" images and study closely.

[BATAAN]

Also, the safe design, build and operation of a large marine railway requires experience in the job and is no place for a beginner who knows very little about them.

[BATAAN]

Here is a short video of a working shipyard with 7 marine railways in southern Okinawa. Note the method of shoring KAISEI, a high-bilged and difficult to haul vessel.
http://www.youtube.com/watch?v=vMMGjaOOamo

[David7438]

Originally Posted by BATAAN

Here is a short video of a working shipyard with 7 marine railways in southern Okinawa. Note the method of shoring KAISEI, a high-bilged and difficult to haul vessel.
http://www.youtube.com/watch?v=vMMGjaOOamo

Thanks a lot! and Have a good night!

[David7438]

Originally Posted by BATAAN

Here is a short video of a working shipyard with 7 marine railways in southern Okinawa. Note the method of shoring KAISEI, a high-bilged and difficult to haul vessel.
http://www.youtube.com/watch?v=vMMGjaOOamo

Do you have the experience of using concrete tracks?
It's hardness and strength are smaller than steel, is it lasting long?
Thanks for reply!

[mydauphin]

Originally Posted by BATAAN

Also, the safe design, build and operation of a large marine railway requires experience in the job and is no place for a beginner who knows very little about them.

You can break stuff and someone will get hurt...

[David7438]

Originally Posted by mydauphin

You can break stuff and someone will get hurt...

Sorry! I am real a junior in the actual operation of vessel and associated facilities. And I hope that I could get some experienced information from this forum. Thanks for your stand.