Mainly from the text column order jib role that requires a certain column

High tower crane tire tire crane substructure is basically the same with the ordinary. The difference is that the former place in the latter mounted jib up the school installed a p-frame is installed into place two hydraulic cylinders pull up the school. Install boom in the middle column. This crane metal structure composed of the following parts.
     1. Trolley frame
     Crane with steel frame with steel welded into a box-shaped (or slab) structure, the travel drive, transmission device mounted on the support frame mounted umbrella holder r6 rotary support, bracket mounted to the frame at the front and rear end beam. Material generally use low-Jin Gaoqiang degree structural steel. Because although the number of products to be certain counterweight could be considered ordinary carbon steel frame.
    2. Turntable
     Crane turntable structure similar to ordinary tires. To install the mounting arm at school legislation, the tail with significant support beams a ship with a Hand pallet trucks-strength low-alloy structural steel made ​​with good strength and rigidity of the box-shaped structure.
     3. Column
     Mainly from the text column order jib role that requires a certain column height to install compensate pulley. Column one small ship, I asked for the two big large section box structure to ensure good torsion resistance.
     4. Boom
     The boom of the crane truss structure, the main square seamless multi-chord vessels with paragraph 2 and pin hinge.