Slope Protection | Tutong, Brunei

2,000m² of CC5^® installed to provide erosion protection to a steep slope near a large electric pylon

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Project Overview

In June 2019, Concrete Canvas^® GCCM (CC) was specified and installed as a slope protection and erosion control solution for a 31m high slope in Tutong, Brunei.

Slope prior to installation, removal of vegetation from crest of the slope, slope following preparation temporarily protected with sheeting, deploying CC Bulk Roll for installation

2000m²

of CC5^™ used to protect the slope

2 Phase

approach was carried out to line the slope

21 Days

to complete by a team of 10, including climbers

Solution

Bore piles and vegetated erosion control mats were considered for the project, but were disregarded. Bore piles would have been complicated to install due to the limited space and access on the site, particularly as a large pylon sits on top of the slope, just 11m from the edge. Vegetated erosion control mats were disregarded as it was not possible to ensure that vegetation would establish sufficiently to protect the slope. CC was ultimately specified as it would eliminate the requirement for heavy machinery and provide the quickest installation, protecting the entire slope.

The installation conditions were challenging for the ten-person crew. The 31m slope is steep and the soil very hard. As a result, the material had to be deployed from the crest of the slope, with skilled climbers needed to assist in positioning, jointing and fixing the material for health and safety purposes.

Fixing CC to ground using steel pegs

Design & Installation

CC5^® Bulk Rolls specified
Vegetation removed and slope face graded
A step was built halfway down the slope to give the excavator safe access to top and bottom sections
CC5^®Bulk Rolls were deployed vertically down the face of the slope
CC5^®material was cut and secured within anchor trenches at the crest using steel pegs
Due to the hard nature of the substrate, pre-drilling was required before inserting fixings
Climbers abseiled down the slope face to adjust positioning of the overlaps
Screwed and sealed joint was used
Intermediate fixing pegs were used to secure the CC5^® to the substrate down the face of the slope
CC was hydrated using a portable water tank

Screwing overlapped joints

Hydration, completed upper slope, CC installed around pylon, small drainage channel created and lined for water management

Summary

The project was carried out in two phases, with the top section of the slope lined first, taking around 14 days. While the second phase saw the bottom section of the slope lined in seven days.

The client was satisfied with the performance of the material in terms of the time required to complete the installation, delivery time, ease of installation and the strength and capabilities of the material.

A total of 2,000m² of CC5^® was installed by the team of ten, including climbers, in a total of 21 days.

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