Urban Infrastructure

Introduction :
Plus + StiRex ducts and flat ducts, manufactured from HDPE, have a unique application in the field of internal bonded post tensioning of tendons in pre-stressed concrete viz. projects such as flyovers and bridges, nuclear containments, offshore platforms, via ducts, underpasses, tunnels etc. Flat ducts are especially popular in the construction sectors where use of round section ducts in post tensioned slabs is not possible due to the slab thickness constraints.

Flat Duct :

The unique shape has made it an instant success. It has catered to applications where space is a constraint. Generally speaking, it won’t be possible to use the round section ducts in post tensioned slabs due to the slab thickness constraint. Flat Ducts has proven to be a boon in this sector. The design is quite unique and optimized, which has an edge over the conventional metal ducts.


Plus + StiRex HDPE Duct and Accessories :

  • Produced out of quality raw material Polyethylene & Polypropylene strictly conforming to FIB 7 Bulletin – 7 requirements
  • - Material Tests carried out both at Raw material producer and in house lab at Rex
  • Sizes suitable for most of anchorage systems used by Premium PT agencies


Accessories Available :

  1. Press Fit Couplers
  2. Press Fit Coupler with “O” Ring.
  3. Heat Shrink Sleeves
  4. Grout Vent, Grout Port and Grout Valve.



Press Fit Couplers :

Press Fit Coupler with “O” Ring :



Heat Shrink Sleeves :

Grout Vent, Grout Port and Grout Valve :


Advantages :

  • Corrosion Protection
  • Enhances fatigue life of tendons.
  • Helps electrical monitoring of tendons.
  • Chemically inert.
  • Good weathering resistance.
  • Environment friendly.
  • Good impact and compression strength.
  • High stiffness and flexibility.
  • Joining very easy.
  • Low and more reliable friction co-efficient to allow best Post Tensioning performances.
  • Due to more thickness Plus+StiRex ducts can withstand PT steel forces during stressing.
  • The intermittent and distant corrugations in Plus+StiRex educes wobbling effect of the duct


Plus + StiRex HDPE ducts qualifies in the specification requirement like :

  • Wear Resistance
  • Flexural Behaviour
  • Lateral Load Resistance
  • Longitudinal Load Resistance
  • Leak Tightness
  • Corrosion Protection
  • Flexibility
  • Bond Behaviour
  • Friction Parameters
  • Electrical Isolation (option)



Plus+StiRex Corrugated sheathing duct is having a unique application in the field of internal bonded post tensioning of tendons in prestressed concrerete viz construction projects such as :

  • Flyovers and Bridges.
  • Nuclear containments.
  • Offshore platforms .
  • Via ducts.
  • Elevated Expressway Project.
  • Underpasses.
  • Tunnels.
  • Pipelines.




Bangalore Elevated Expressway Project
Elevated Expressway Project Bangalore
Development Muscat International Airport Project
Bangalore Nelemangala Elevated Highway Projects
Sitra Bridge Project, Bahrain


For More Details, Please Contact:

Shital Patil / Amar Madnaik


Mob : +91 9011044524 / +91 96899 86575


Direct Line : + 91 233 2621853