Urban Infrastructure

Introduction :

Pre-StiRex Corrugated Sheathing ducts, 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.

Advantages :

  • Corrosion Protection.
  • Helps electrical monitaring of tendons.
  • Good weathering resistance.
  • Good impact and compression strength.
  • Good Bond with Concrete
  • Speedy installation due to fewer joints.
  • Chemically inert.
  • Environment friendly.
  • High stiffness and flexibility.
  • Even when bent, cross section of the duct retains its circularity.
  • Wobble Co-efficient observed k = 0.00116/M
  • Friction Co-efficient observed u = 0.068


Technical Data :

  • Technical Specifications Conforming to :
    • IRC 18 : 2000
    • Fib Bulletin 7
    • NPCIL Spec. No. PP/M/1721
    • FOOT (Fiorida Department of Transport)
    • Railway Concrete Bridge Code vide Addendum & Corrigendum slip No. 6
  • Standard packing- 30 mtr. coil or as per reQuirement in the multiple of 1mtr. up to 102mm ID size. For bigger sizeses only in 6mtr. straight length.
  • Standard Colour - Black


Jointing :

Easy jointing & Speedy Installations :

HDPE sheathing in coils requires fewer joints than conventional sheathing. Its light weight reduces the need for manpower and heavy equipment handling. Total installation time can be reduced considerably.


Methods for jointing :

  • Jointing with Buttwelding
  • Snapfit Couplers
  • Heat Shrink Sleeves
  • Split Couplers


Jointing with Buttwelding :

Snapfit Couplers :

Heat Shrink Sleeves :

Split Couplers :

Other Accessories :

  • GroutVent
  • EndPiugs



Quality Assurance :

Quality Control :

The "Pre-StiRex" ducts are subjected to stringent testing for a wide range of field parameters.Compliance of various standards and regulations such as Fib, IRC, NPCIL etc. is always observed.


Vital Testing Parameters :

  • Raw Material tests
  • Dimensions
  • Flexural Behavior
  • Flexibility
  • Lateral Load Resistance
  • Leak Tightness
  • Longitudinal Load Resistance
  • Wear Resistance
  • Bond Behavior
  • Friction Parameters



Raw Material testing :

Flexibility   Test Measuring Device :


For More Details, Please Contact:

Shital Patil / Amar Madnaik

Mob : +91 9011044524 / +91 96899 86575

Direct Line : + 91 233 2621853