G A N T R I E S   F O R   P R E C A S T   S E G M E N T   E R E C T I O N
 NRS AS: Friday, November 21, 2008 Edge breaking technology 

The UNDERSLUNG Launching gantry:


Typical erection methods, conditions and feasibilities:

Our gantries (LG) can be used for both balanced cantilever as well as for infill span-by-span erection. Depending on the project dry joint or wet joint erection is required.

  • Featuring segmental bridges with dry or glued joints, using erection methods like infill-spans and balanced cantilever.
  • Special hinged underslung gantries (with up to 12 hinges) have been supplied to accommodate tight horizontal curvature, down to 75m radii.
  • Use of separate centre-beam to accommodate erection of separate parallel double and triple tracks as well as bifurcation spans.
  • Vertical climbing of gantries to accommodate tight vertical curvature and steep longitudinal fall.
  • Partly and fully final post-tensioning carried out while the whole span is still supported by the gantry, without need to use a special plunger arrangement at each end.
  • "Glue-as-you-go", erecting segments without any or only limited double handling of segments.
  • Balanced cantilever and infill-span erection with same gantry.
  • Cranes capable of walking through hinged transitions (also noses)
  • Gantry can lift and adjust whole span in level and line ( vertical and transverse adjustment)
  • Gantry is selflaunching, transports also supports by its own crane
  • Aux. equipment for erecting pre-cast wings at 2nd stage ( if needed)



Special features:

Supporting Bracket installed on both standard pier and straddle bent (station area) Hydraulically adjustable hinge ( 1 of up to 7) to lay out spans / launch at radii down to as little as 75m.

For more information: See Our Projectgallery