Movable scaffolding system

A movable scaffolding system (MSS) is a special-purpose self-launching form used in bridge construction, specifically prestressed concrete bridges with segments or spans that are cast in place.

While superficially similar, movable scaffolding systems should not be confused with launching gantry machines, which also are used in segmental bridge construction.

[1] Once several bridge piers are complete, support brackets are attached to adjacent piers and the main parallel girders of the MSS are lifted in place to support the scaffold and concrete forms.

Jacks are used to raise the girders and forms and the concrete is poured for the segment (or span) after rebar is placed.

After the concrete has cured and the tendons have been tensioned, the jacks are lowered and the MSS girders are launched to bridge the next span.