20 August 2004
20 August 2004
Carbon Fibre pre-stressed trusses are to be used to repair cracks in pillars, tie beams and the girders on a Malaysian flyover.
Cracks appearing in a middle ring road (MRR2) flyover in Malaysia, Asia, are due to be strengthened by repairing 31 out of the 33 beams supporting the road by using carbon fibre trussing, estimated to cost 20 million RM (2.9 million GBP).
Whilst the Works Minister, Datuk Seri S. Samy Vellu said the segment of the flyover between the FRIM turnoff and the start of the flyover would be opened as soon as possible, he reiterated that there was nothing wrong with the design of the flyover.
“Consultants from Monash University have already certified that the design is safe and the Federal Government is engaging a third consultant, whose decision on any suspected flaws in the design will be final,” Samy Vellu reiterated at a recent press conference.
Samy Vellu added that the cracks may have occurred during construction when the box girders were loaded by a gantry crane onto the tiers (beam and pillar) brought about by placing box girders onto the tiers by the gantry crane, which may have caused some movement.
“I have made my submission to Parliament and have recommended that a total RM20mil will be required to carry out the necessary repairs which will be completed within a three-month time frame. At present a number of engineers are carrying out the necessary repairs and are still conducting tests to ensure the safety of the flyover.
Samy Vellu said that 4mm thick carbon-fibre pre-stressed trusses would be used as the main materials to repair the pillars, tie beams and the girders, as the tensile strength is around five times stronger than that of steel.
“With the use of carbon-fibre materials, there is no need for any demolition, breaking or reconstruction work and once the repairs are completed, this section of the MRR2 will be problem free,” he said.
Rolls of the carbon-fibre material is pre-stressed first and then is glued and wrapped around the beam to make one homogenous structure.
The contractor had appointed a consultant from Australia while a consultant from Germany was appointed by the Public Works Department.
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