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Handling a suspended load during a lift Disclosure Number: IPCOM000251590D
Publication Date: 2017-Nov-14
Document File: 2 page(s) / 99K

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The Prior Art Database

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Handling a suspended load during a lift

When lifting a load, it may be desirable to change the aspect of the load. This may happen for

example when a component is transported or supported at ground level, in a first, transport or

support orientation. That component may need to be connected to a construction, while at a

different angle than its transport or support angle. Changing the orientation of a load while it is

suspended from a crane may present challenges, especially in the case of large, heavy components.

Some methods have been suggested for lifting wind turbine components, initially in a transport or

storage orientation and connecting them to a part-constructed wind turbine, especially up a tower,

at a connection orientation. A method and apparatus for rotating a wind turbine rotor hub element

is suggested in US2014319091. An alternative arrangement for achieving a similar effect is known

from US8528735. Other such arrangements are described for example in WO2015144837,

EP2604850, EP2589795, WO2008089763, or EP2653716.

Now it is suggested to change the orientation of a suspended load by attaching to the load a hinged

lifting arm. The lifting arm has an attachment end and an adjustment end. It is capable of

supporting the load’s weight from its attachment end, at or near its hinged connection to the load.

The arm has an adjustment end, where it is provided with a winch arrangement. The winch

arrangement is capable of winding a cable in or out. The load may be suspended from a suspending

end of the winding cable. The hinged arm may be suspended from e.g. a crane hook or other lifting

apparatus, via the winding cable. Thus, a load may be suspended from the winding cable when the

lifting arm is connected to the load, and the winch may be operated to wind in or out the winding

cable during a lift.

Handling a suspended load during a lift

In preferred embodiments, one end of the winding cable may be an attachment end, connected to

the load, at a position on the load spaced from the connection location between the lifting arm and

the load. The winding cable may thereby extend from its attachment end at a connection location,

at the load, to the winch on the lifting arm. The cable may be turned around the winch by one or

more turns, preferably enough turns to prevent slippage of the cable around the winch when the

cable is under load. The winding cable may further extend from the winch to a suspend...