CMP-Thames Ltd | BRANKSOME CHINE OUTFALL
CMP were contracted to install a 350m length, 800mm dia HDPE outfall pipeline from Branksome Chine beach out to sea.
marine piling, marine construction, diving, cofferdams, jack up, outfall construction
16142
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BRANKSOME CHINE OUTFALL

About This Project

CMP were contracted to install a 350m length, 800mm dia HDPE outfall pipeline from Branksome Chine beach out to sea.

Works Description

Inshore works:

  • Sheet piled cofferdam installed stretching 100m out to sea from promenade wall
  • 40m of cofferdam installed in tidal conditions
  • Up to 5m depth of sand excavated from cofferdam using long reach excavator
  • End of pipe pulled into cofferdam and attached to promenade wall connection
  • Pipe installed into cofferdam trench
  • Concrete mattresses installed over pipeline
  • Trench backfilled and cofferdam bund removed

Offshore works:

  • Buoyant pipe pulled out to jack-up barge using marine craft
  • Pipe sunk to seabed using controlled submersion techniques
  • Specially designed and developed system which communicates between the pipeline and the long-reach exactor used to dig trench of accurate depth from the jack-up barge
  • Once pipeline was to desired depth and position, divers used to place concrete mattresses over pipeline
  • Trench backfilled
  • Full bathymetric survey undertaken
Project

Branksome Chine Outfall

Location

Branksome Chine, Dorset

Client

Dean & Dyball for Wessex Water

Value

£ 850,000

Date
Category
Coastal, Marine, Outfalls, Piling