FP McCann Smoothbore Shaft Linings are made from precast concrete segments designed for shaft and tunnel construction, with smooth internal faces and watertight EPDM gaskets. Suitable for a range of ground conditions, these linings are engineered for strength, stability, and efficient installation across various diameters and build methods.

  • Precast concrete shaft and tunnel lining system with smooth internal finish

  • Pre-fitted EPDM rubber gaskets for immediate watertight sealing

  • Segmental rings available in standard, corbel, recessed, choker, and combined types

  • Wet cast segments with minimum 28-day strength of 55 N/mm²

  • Reinforced with steel or synthetic fibres or cages to suit project needs

  • Front and back bolted connections with sheradised or galvanised fittings

  • Suitable for underpinning, caisson, and chimney construction methods

  • Manufactured under an Integrated Management System accredited to ISO 9001

Applications

  • Shaft construction in tunnelling projects

  • Caisson sinking

  • Chimney construction

  • Underpinning works

  • Use in varied ground conditions

Performance

Minimum 28-day characteristic cube strength: 55 N/mm²

Materials

Precast concrete with steel or synthetic fibre reinforcement

Finish

Smooth internal faces

Options and variations

Standard, corbel, recessed, choker, and combined cutter choker ring types; front or back bolted; universal linings for diameters 10.5m and above

Installation

Segmental rings suitable for underpinning, caisson, and chimney construction; cross joint and circle joint connections with spear and T bolts; pre-fitted EPDM gaskets

Accreditations

Integrated Management System accredited to ISO 9001