In this method of girder launching self-weight of BFR & supported
portion of launching truss over BFR is act as counter weight. Girder is hanged up by
chain pulley as shown in sketch and rotation of the hanged girder is controlled manually
with the help of ropes. Total assembly is moved upto proposed position of girder then girder
is lowered gradually at desired span location.
This method is mainly used at the bridge sites where it is very difficult to make supporting arrangements from river bed such as perennial water flow or pier height is more.