introduction
Tower crane is a rotating crane whose boom is mounted on the top of
the towering tower. It is mainly used for vertical transportation
of materials and component installation in construction of
multi-storey and high-rise buildings. It is composed of metal
structure, working mechanism and electrical system. The metal
structure includes tower body, boom, base, attachment rod, etc. The
working mechanism has four parts: lifting, luffing, turning and
walking. Electrical system includes motor, controller, distribution
frame, connecting circuit, signal and lighting device, etc.
Tower cranes are divided into two types of rotary and rotary:
First, rotary tower crane: the tower body does not rotate, the
swing arm above the slewing support, the balance arm, etc., through
the slewing mechanism around the center line of the tower body for
full rotation. According to the requirements of use, it is divided
into running type, fixed type, attachment type and internal
climbing type. Running tower crane can run along the track, working
range is large, widely used, suitable for multi-storey building
construction; If the base of the crane is fixed on the track or the
tower body is directly fixed on the basis of the fixed tower crane,
the boom is longer; Such as in the fixed tower crane tower every
other certain height with attached rod connected with the building,
that is, attached tower crane, it uses tower height device to make
the upper part of the crane rotation can be increased with the
building and the corresponding increase, for high-rise building
construction; The crane is installed in the elevator shaft or
connected holes, the use of hydraulic cylinder to make the crane
according to the construction process along the shaft upward climb
is called the internal climbing tower crane, it saves part of the
tower, the service range is large, does not occupy the construction
site, but the structure of the building has certain requirements.
Two, the next rotary tower crane: the slewing bearing is installed
between the base and the turntable, in addition to the walking
mechanism, other working institutions are arranged on the turntable
together. In addition to the track type, there are track type and
wheel type with track chassis and tire chassis as the walking
device. It has low center of gravity, can be disassembled and
transferred as a whole, lightweight and flexible, widely used,
suitable for multi-storey building construction.
