Tunnel and shaft solutions brochure - Humes

Arch system components
A range of precast concrete products are usually provided
as part of the arch structure along with a selection of
retaining wall structures including:
• precast concrete feeder chambers to fit intake valves
• spandrel walls which run parallel to the arch, retaining
the backfill at each end of the tunnel. They are
designed to match the arch profile.
• wing walls which are placed at each end of the
spandrel wall to retain the backfill and support the
spandrel walls.
Tunnel and shaft solutions 21
Top:
Arch system with
spandrel wall and
wing walls
Middle:
Spandrel wall
Bottom:
Wing walls
Tunnel and shaft solutions