Bonded and external tendons, stay cables, bearings, joints and anchors, installed by IBEC crews and stressed against a calculated elongation. The structural systems that stay in the bridge after the equipment leaves.
Position
Prestress is the one part of a concrete structure you cannot inspect once the grout has set. That puts the whole burden on the process — duct profile held to tolerance, strand cut and pushed clean, jack calibrated within the certificate period, elongation measured against a calculation the site engineer can read. IBEC supplies the hardware and the crew together, because splitting them is how records go missing.
Applications
Each system is engineered to the job in front of it. The figures below are the working envelope, not a catalogue limit.
Multistrand tendons inside the concrete section, grouted after stressing, for box girders, I-girders, transfer beams and slabs.
Tendons run outside the concrete inside the box, individually inspectable, de-stressable and replaceable over the life of the structure.
Parallel strand stays with individually sheathed and waxed strands, anti-vandalism pipe, and dampers tuned to the deck.
POT-PTFE, spherical and elastomeric bearings, selected against the movement and rotation the deck will actually see, not the catalogue nearest size.
Strip seal, modular and finger joints, plus the replacement of joints on structures already in service under traffic management.
Permanent and temporary anchors for retaining walls, deep excavations, dam strengthening and uplift resistance, with proof testing on every unit.
External post-tensioning, carbon fibre laminate, section jacketing and cathodic protection for structures that must carry more, or last longer, than they were built for.
What comes with it
Envelope
9,400 t
Strand installed
37 × 15.7 mm
Largest tendon
6,000 kN
Anchor capacity
22
Stressing crews
Designed to
Two overhead launching gantries erecting 11.6 km of segmental deck over a live six-lane arterial road, on a three-day span cycle.
Four pairs of form travellers building a variable-depth box girder across a braided river with a five-month working season.
A 128-stay parallel strand system with tuned dampers on a 340 m main span, installed strand by strand from the deck.
Send the drawings and the dates. You will get a method, a cycle time and a schedule of equipment — from an engineer, not a sales desk.