For the launching operation special “friction system” using hydraulic lift-push jacks is used. Alternatively, the launching can be done by means of hydraulic pulling jacks using strand or bar temporary tendons. A steel nose is installed on concrete viaducts or a temporary tower with stays on metallic decks.
Products
Incremental launching
Incremental launching methodology
The concept of the Incremental Launched Method is to cast or assemble successive deck segments of approximately 15-30 meters long in a stationary formwork on concrete bridges (similar to factory conditions or segments of 100-200 meter on metallic viaducts) behind the abutment and then to push/pull the increasing lengths of bridge decks into their final position by sliding the segments over special Teflon-stainless steel devices (temporary or permanent bearings).
MK4 is a leading company in this field having already successfully accomplished many projects of this kinds (concrete and steel structures) worldwide.
Typical scope of work (construction package) offered by MK4 includes:
- Construction design / alternative design.
- Supply and installation of temporary / permanent post tensioning.
- Supply and erection of special formwork and launching steel-nose.
- Supply of bearings (temporary/permanent).
- Launching operations and equipment.
- Supply of special sliding pads and devices.
- Bar prestessing for steel-nose and lateral guides attachment to the structure.
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