mast mast bottom should be compacted bottom handle, smooth, spread over two sleepers

Bridge crane within the plant, because the top rail from the roof chord close, plus overhead cranes are larger in size and weight, it is not mechanized lifting. SMEs often use a single mast crane lifting the overall standing, so you can improve efficiency, shorten the construction period and reduce high-altitude operations, the construction procedure is as follows.
(A) the erection of the mast
① mast mast height maximum height of the ground to the roof top of the mast to a height less operating space between the roof and the height of the mast sleepers inquiry. Minimum height should meet the needs of lifting height.
② mast mast position due to be erected in the carts between the two main beam bridge crane center of gravity, the car must be biased, but the mast should deviate from the centerline of plant, shown in Figure 7-8. Its offset should be based on weight carts, trolleys and trolley weight offset distance determined by calculation.
③ mast mast bottom should be compacted bottom handle, smooth, spread over two sleepers, if necessary, can be added between two sleepers rails or beams, paved area determined by calculating base endurance, ensure that the ground bear mast axial pressure.
④ mast mast electric stacker methods used mobile cranes erect, quick and safe crane beam can also be used stand mast bracket wrench can also be used auxiliary mast vertical mast. Using the crane beam corbel Erecting the mast, to carry on the crane beam corbel force checking to ensure the transverse horizontal component does not exceed the maximum weight within the span of the bridge crane nominal weight and the amount of the sum of a trolley / 20.
Erection of masts, the mast should be pre-wind cable rope bindings temporarily close the roof truss bottom chords on the mast until the mast was hanging to determine the location immediately after the entire wind cable rope fastened on top of the mast and tighten the ground, such as individual wind cable rope lift after the force has stayed truss chord or circumstances, the application temporarily wind cable hove live mast, fixed wind cable rope adjusted to the appropriate location, and then release the temporary wind cable wire.