Slope Protection | Madrid, Spain

CC5^® used to prevent rainwater runoff infilltrating a slope

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Project Overview

In June 2013, Concrete Canvas ^® GCCM* (CC) was used to protect a slope located in Pozuelo OesteStation, Pozuelo de Alarcón, Madrid, Spain. Rainwater runoff was infiltrating the slope and risking slip, posing a severe threat to the railway line at the slope’s base

Site before work began, Prepared slope, drainage channel and anchor trench, CC5^® deployed vertically, Pegs inserted every 500mm

1250m²

of CC5^® used to provide erosion protection

Metro

remained in operation during installation

2 years

after install, CC was specified again

Solution

Shotcrete was considered, however this would have created large amounts of rebound, requiring the closure of the railway line and the need to protect the surrounding sensitive infrastructure. Rope access was required due to the steepness of the slope, and the proximity of the rail line and nearby road caused further access issues.

As the client wanted to minimise any distruption to the railway line, CC5^™ was specified for the project. CC5^™ can be installed using minimial labour and equipment whilst the line continued to operate – eliminating the need to close the line and possible delays.

Hydration, fixing to existing concrete structure, drainage channel at toe of slope, backfilled anchor trench and drainage channel

Design & Installation

Slope regraded, vegetation and rock removed
Channel cut at the crest and toe of the slope
Bulk Rolls of CC5^™ were specified
Vertical Layup
Overlaps secured with screws
Masonry screws used to secure CC to existing concrete structures
Hydrated using a water bowser and hose

Completed section of slope

CC allowed metro line to remiain open during installation

Summary

A total of 23,700m² of CC5^® material were installed by a local contractor. A team of ten carried out the works over 24 days, with around ten hours worked per day in hot, dry conditions.

This rate of installation would not in any way be possible using conventional concrete and was not technically viable with the alternative solutions considered for the project. The client had provided a very tight deadline for this project, as they had to make part of the pond operational. The use of CC on this project meant the installation was completed well before the deadline. The project was highly successful, particularly in terms of time savings and ease of installation for the contractor.

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Phase 2 slope opposite existing CC installation prior to install, slope prepared, screws inserted every 200mm, Train line remained open throughout installation