Channel Lining | Pen Mill, Yeovil, Somerset

550m² of CC8^™ used to line an interceptor channel

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Background

In August 2021, B Keogh Construction worked to rapidly line a surface water interception channel with 8mm thick Concrete Canvas^® (CC8^™) GCCM*. The works were undertaken on the Wessex Route for Network Rail located in Yeovil, Somerset. The main contractor was Osborne who sub-contracted the construction work to B Keogh Construction

Section of channel excavated prior to installation

CC8^™ suspended from a spreader beam and installed transversely

550m²

of CC8^® was installed

10x

faster to install than traditional concrete

200m²

Installed on average per shift

Solution

During periods of heavy rainfall there was localised flooding of the railway line but also small landslips along the adjacent cutting. The decision was made to reprofile the cutting and create a channel to intercept surface water from nearby farmland. The channel needed to be resistant to scour so it was decided to line it with a GCCM.

CC8^™ is a Type II GCCM as defined in ASTM D8364, it is suitable for use on soil subgrades and was chosen for this project to suit the abrasion, wear and loading requirements. CC8^™ is also BBA certified with durability in excess of 120 years when used in erosion control applications.

CC8^™ overlapped by 100mm and secured with 30mm screws

Edges of CC8^™ secured within anchor trenches

Design & Installation

Channel was cut using a v-ditch bucket
CC8^™ Bulk Rolls specified
Transverse Layup
CC8^™ cut to length using hand tools
Edges secured within anchor trenches
Sealed and screwed joint
Hydrated at the end of each working shift

Conclusion

The installation was a success with the contracting team saving time on-site, reduced the logistical footprint of the project and effectively future-proofed the local rail network against adverse weather events

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