Without disassembling machine, and without the help of other
auxiliary facilities, the machine can directly placed box beam on
the top of the piers at the entrance or exit of tunnels.
This machine is consisted of two parts, one is the special carrier,
and the other is underbridge machine. The special carrier is in
charge of lifting box beams from the casting yard and carrying
beams to the jobsite. Then, with the help of the underbridge,
the special carrier places concrete box beam on the pier.
Underbridge machine plays a role as the supporting beam, and works
together with the special carrier. After the erection of the box
beam, the underbridge machine will change the position of its
legs by itself in order to be ready for next operation in the
The working procedure of special carrier has a remarkable
characteristic. It has three functions: beam lifting, beam
transporting and beam placing. It is quite different from ordinary
launching equipments in structure and working mechanism. And its
dimension is much smaller than other kinds of launching gantry.
This kind of special launching carrier collects the three functions
together and there is no overlap in functions, so it can work
·Placing concrete box beam for same length span of
bridge or different length span of bridge, with ballast or without
ballast on deck.
·Erecting the concrete box beam on the top of the piers at the
entrance or exit of tunnels.
· Erecting and transporting box beam in the limit area of height
·Surmountable slope 2 %
· Min. radius of the bridge 2000m.
·Wind speed: 72km/h with load, 144km/h without load
1.2 Main technical characteristics
·Lifting, transporting, and placing huge box beam are
achieved through one machine with lower economic investment of
the construction company.
·Besides working for normal erection of bridge, the machine can
directly placed box beams on the top of the piers at the entrance
or exit of tunnels.
·It is convenient to change jobsite without any auxiliary devices.
The special launching carrier can lift the underbridge itself to
transfer to other jobsites. It is especially suitable for
launching concrete beams between the tunnels.
· With small modification, the special launching carrier can easily
erect other kinds of bridges.
·The carrier is also an independent lifting machine that
can satisfy lifting box beam in the casting
· When the distance (between the stacked yard of box beam and the
job site of bridge erection) is over 4 km, the erection of two
concrete box beams can be completed. If there is
a situation with the tunnels in the construction, the
working efficiency is of this machine much higher than
any other kinds of launching machines.
·The machine is 34m between the front running
tyre group and rear running tyre group, and it means the
two tyre groups always stand on the different concrete boxes, so
the forces on deck and the pier or abutment are less than
other kinds of the transporting and launching