Second, the construction boom characteristics

First, according to whether the running gear
Can be divided into mobile and stationary tower crane tower crane.
Mobile tower crane according to different walking devices can be divided into rail, tire, car type, crawler of four. Rail-mounted tower crane tower fixed on the bottom shelf to walk, you can run on a dedicated Hand stacker, good stability, can walk with a load, high efficiency, which is widely used in construction and installation works. Tire, truck mounted and crawler tower crane trackless equipment, easy to move, but you can not walk with a load, poor stability.
Stationary tower crane according to different installation location, is divided into self-elevating and attached inner climbing type two, self-elevating tower crane can be attached to the building with the temperature increased for high-rise buildings, structures only withstand horizontal loads coming from the crane, attached to convenience, but take up more than structural steel; internal climbing tower crane inside the building (elevator shafts, stairwells), using a set of brackets and lifting system for climbing, Scissor lift more burdensome , but take up less structural steel, does not require installation of foundation, all the weight and the load borne by the building bear.

Second, the construction boom characteristics
Can be divided into luffing jib luffing (boom) and trolley boom (flat arm) tower crane.
Luffing jib luffing jib tower crane is lifting unrealized by luffing, and its advantages are: give full play to the effective height of the boom, simple mechanism, the disadvantage is the minimum amplitude is limited to the most significant 30% so, can not completely close the tower, luffing jib together with the load when lifting, can not take the load amplitude.
Trolley jib tower crane is by horizontal boom track mounted Trolley realized range, and its advantages are: amplitude range, the trolley can be approaching the tower, band load amplitude, shortcomings are: boom force situation is complex, demanding for the structure, and the boom and the car must be in the building upper spire roof mounting height of buildings to be higher than 15-20 meters.