Channel Lining | Cold Blow, Pembrokeshire, Wales UK

CC8^™ Channel Lining Prevents Slope Failure

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Project Overview

In September 2018, Concrete Canvas^® (CC) GCCM was specified by Network Rail to line a series of crest and lateral drainage channels at Cold Blow near Narbeth in Pembrokeshire, Southwest Wales.

1650m²

of CC8^® was installed along the embankment

550 linear

metres of crest drainage were lined

10x

faster than traditional concreting methods

Solution

The cutting was subjected to water ingress from surface runoff from the adjacent saturated agricultural field. The aim of the project was to formalise the existing drainage channels in order to address the potential for rotational earthwork failure within the slope.

550 linear meters of trapezoidal channel were excavated along the crest of the northern embankment, measuring 500mm deep, with 500mm invert and 45° slopes. The works were carried out by Alun Griffiths for Network Rail.

Delivery of CC8^™ Bulk Rolls, excavated channel, hydrated CC8^™ and anchor trenches back filled

Proximity of slopes to rail line

Outfall channel laeding to headwall following excavation

Design & Installation

CC8^™ Bulk Rolls specified
Slope graded and compacted prior to deployment
Transverse layup
Perimeter edges secured in anchor trenches
Screwed and sealed overlap joints
50mm round head ground pegs used to resist hydraulic shear
Cut to fit around structures and variations in profile
Hydrated using a water tank and hose with sprinkler head attachment

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Corner detailing from main channel to outfall

Summary

CC is typically installed 10x faster than traditional concreting methods, greatly reducing time on site and associated costs. The ability to deploy the material from the adjacent field also meant there was no need for costly line possession, allowing for installation without any disruption to rail services.

A total of 1,650m² of CC8^™ was installed by the Alun Griffiths team. CC provided a rapidly applied, environmentally friendly solution to providing erosion control and formalisation to the cutting channels.

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