It is a an effective launching system
and will only be economically viable for a relatively long
stretch of viaduct construction.
The launching truss is generally self-launching and is usually adopted to launch an entire precast girder, weighing up to 300 tons.
Beams to be launched are generally transported to the launcher from the rear spans via locomotive, or other transport vehicles. The beams serve as counter weight while the launcher is crossing to the next span.
