Building Slab

Post Tensioning of Building Slab

February 26, 2015

Post Tensioning

This is a good video showing step-by-step procedure of a building post tensioning slab. These are some of the main steps shown in this video.

  • PC Strand preparation, into a uncoiler.
  • Cutting the PC strand into desired length and pack them according to tendon size / configuration.
  • Forming Fixed Anchors (Dead End) with the use of a Bond Head Machine.
  • Positioning the Anchors on formwork with pocket former.
  • Installation of galvanised steel duct and Bursting Reinforcement.
  • Stranding.
  • Securing the Fixed Anchors.
  • Positioning of Bar Chairs to achieve desired tendon profile.
  • Installation of Grout Vents to tendon.
  • Concreting.
  • Removing pocket former and installing of Anchor Head & Wedge in preparation for Stressing.
  • Marking of PC Strand length for elongation reading (after stressing).
  • Stressing using hydraulic Mono Stressing Jack.
  • Checking for desired PC Strand elongation.
  • Removing excess PC Strand and covering up recess pocket.
  • Preparation of Grout material.
  • Grouting of tendon and job completion.

Post Tensioning for Building Slab & Beam

January 20, 2015

These are some site photos contributed by E-Force Engineering for a mixed development project in the western part of Singapore. Post tensioning was carried out for the prestressed concrete structure. Flat Anchors of 3 - 5 x 12.70mm PC strand were used for the slab post tensioning, and multistrand Anchors of 19 x 12.70mm PC strand were used for the beam post tensioning. Both Mono Jack and 300 ton Stressing Jack were used in this project.

Post Tensioning (Beam - 19 strands)Post Tensioning (Slab - 5 strands)PC StrandPost Tensioning (Slab - 5 strands)