Precast manhole reduces excavation times

A pre-cast concrete manhole unit is cutting installation times and improving safety, according to the manufacturer

Concrete drainage specialist FP McCann says it has gained instant recognition amongst groundworks contractors and their specifiers for its fully integrated wide-wall manhole chamber unit. The precast concrete system incorporates the successful WRc-approved DN1200 polypropylene lined Easi-Base with the recently launched 130mm wide-wall chamber ring available in four section depths (1000/750/500/250mm).

The robust design provides a durable, watertight installation, with the requirement for a ready-mix concrete surround eliminated. Speed and ease of build and the resulting increased site productivity, is a major benefit on offer from the Easi Manhole. From base to cover slab and backfill, a typical 3m completed unit can be in place and secure in under 90 minutes.

Traditional methods of chamber construction involving wet concrete and mortar trades can take up to 40 hours. The company says that reduction in time spent in the excavation has significant benefits in terms of operative safety and welfare. It removes the need for concrete deliveries, which further enhances site safe practices. The Easi Manhole is being installed on three new housing developments in Nottinghamshire by Newline Civil Engineering.

On each site, the manhole chambers are being used on the foul and storm drainage system.

FP McCann says the Easi Manhole has been chosen because of its durability, speed of installation and the elimination of a concrete surround, but the benefits and advantages of using the system are numerous. Key to its success is:

  • A fast, efficient and economical method of constructing a manhole
  • Significant health and safety benefits.
  • An immediate watertight structure allowing for other trades to instantly follow on
  • Factory pre-fabrication of Easi-Base provides quality in channelling and benching and enables accurate combinations and variations for entry/exit pipes
  • 130mm wide wall chamber rings eliminate the need for concrete backfilling.

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