Post-tensioning is a method of reinforcement employing high-strength
steel strands or bars, which enable the existence of longer clear spans,
thinner slabs and in many cases of structural systems that would otherwise
be impossible due to either site constraints or architectural requirements.
PT Applications are:
Bridges, including major cast-in-place and precast structures,
using various construction methods such as balanced cantilever, span-by-span,
cable stayed, incrementally launched, and typical highway interchanges
and overpasses as well as airport taxiways.
Concrete offshore gravity based platforms.
Circular containment tanks for LNG, water, materials,
Special applications: rock & soil anchors, structural
repair and strengthening and post-tensioned pavements.
PT Installation - 417-301C
Boggy Creek Interchange - Orlando, FL
Freyssinet’s C-Range System represents the state-of-the-art
in multi-strand post-tensioning and is designed for use in all types of
structural systems. Special applications requiring unique applications
such as electrical isolation, adjustability, future removal etc., may be
addressed with Freyssinet’s in-house staff of experienced engineers and
Freyssinet’s C-Range System was developed by drawing on
more than 50 years of experience with post-tensioning and is identified
by features such as:
Versatility—Easily adaptable to suit the applications,
anchorages are rectangular to better fit thinner bridge webs and slabs,
may be used with either 0.60" or 0.62" diameter strands and all
internationally available grades, appropriate for use as internal and external
post-tensioned tendons, available in anchorage increments from 3 strands
up to 55 x 0.62" strand tendons, compatible with galvanized steel,
HDPE and/or HDPP ducts; or ductless applications.
Compactness—Anchorages which allow for better diffusion
of prestressing forces, thereby reducing the web thickness and dimensions
of anchor blocks and recess dimensions.
Efficient Installation—The C-Range is very user friendly
due to its compactness, lightweight anchorage components and development
of very efficient and reliable installation stressing and grouting equipment
Freyssinet’s F-Range System is especially well suited
for transverse prestressing of bridge decks and building slabs. The F-Range
is normally used with flat ducts to optimize the eccentricity of the prestressing
in members with shallow structural depths, yet still maintains the advantages
of its predecessor with its compactness and light weight characteristics.