| 摘要 |
To reduce the wear and tear exerted by a mobile crane when performing an operation with respect to a heavy object, the mobile crane is moved 5 using at least one device comprising a plurality of wheel units, each wheel unit of said plurality of wheel units being rotatable about an upright rotational axis for said wheel unit, each wheel unit comprising at least one wheel having - a first main side relatively close to the upright rotational axis and - a second main side relatively far from the upright rotational axis, the wheels of a wheel unit being rotatable about an axis transverse to the upright rotational axis; and 15 the mobile crane is moved over a surface comprising a relatively hard cover layer on top of relatively soft soil. |
