Demolition Techniques of Disengaged Track Panels of Damaged Railway Bridge
Extreme rainfall caused the collapse of piers and girders in the four simply-supported spans of a railway bridge.The pier No.5 was severely damaged,the supports of the 106 m-long track panels between piers No.0 and No.4 disappeared,leaving the track panels disengaged,and the latter needed to be demolished as quickly as possible.To ensure the security of the existing bridge and lower the construction complexities of the reconstruction work,a plan of"phased de-loading and step-by-step demolition"was implemented.During the demolition,two life ropes were hung over the track panels for operation safety.A trolly was employed as the hoisting equipment and operation platform for personnel.Half of the tracks were demolished and lowered onto ground following the principle of"demolishing one and leaving one"from the starting point to the designated point.At the midspan,the connection of the check rails was removed,with fastenings of the check rails demolished from the midspan towards the ends of the span.The check rails were dragged and removed via winches,afterwards,the trolley was used as construction platform again,to demolish the remaining sleepers in sequence from a designated point towards the ends.At last,the other half of the tracks were demolished using winches,pulleys and steel wire ropes.
railway bridgedisengaged track panellife ropetrolley for sleeper demolitionbridge deteriorationdemolish technique
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