Lifting

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 erection 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  scissor pallet truck 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.
⑤ hung pulley block, set the winch for small and medium-bridge from the physical machine, and can be hung two pulley block, with two hoisting winches, hoist mast set the location and distance from the center is greater than the length of the mast, winches available fixed column within the plant roots, but should be tied at the wood and other protective pads.
(2) group on the carts, loaded trolley traveling crane girders, the car shipped to the lifting position for assembly, carts group finished, the car is placed on a trolley track, and carts tied securely.
(3) bundled beam carts for less than 50t overhead crane, just hang two pulley block, generally using a cross-tied method, the method is: the mast lug toward the direction of the end beam bridge crane system hang hanging pulley block , running rope through the top of the mast mast fixed pulley down to the bottom along the guide pulley toward the winch. Run rope using sequential method. In the side of the cart with a rope tied to the beam cross-licensing to go through two openings platen bundle, so that tied rope was tapped: "∞" shape, commonly known as "8"-shaped bundle method, as shown in 7-9.
When the lack of effective height of the mast, can be boom EMU binding movable trolley beam inside the carts in the top surface of the beam erection carts beams, ends binding slings, sling around the underside of the beam from moving into a tie tackle.
(4) Test suspension
The bridge crane lifting off the ground 0. 3-0. 5m, after 10min after no abnormality, further shaking bridge crane testing, inspection winches, masts, ropes and anchor cable winds of reliability, all normal , continue lifting.
(5) install the operating room
The bridge crane lifting off the ground about 2.5m high, setting up the sleepers under the crane heap, so that the crane resting on the sleepers on the heap, and then installed in the operating room on the frame. Zhuangwan cab car after adjusting the position, this position was calculated to determine the mast lifting points on both sides to reach equilibrium.
Then leave the sleeper crane helicopter heap a small distance, carefully adjusting the position of the car, make sure to balance again after fixing the car. Check other lifting facilities, safe and reliable confirmation only after the lifting style lifting.