A new retaining wall concept, which is tried and tested for the first time.
The first retaining wall system constructed by utilising precast concrete hollow-core slabs in combination with geotextile membrane, was built at the Green Cross Medical Centre in Lords View Industrial Park, Chloorkop, Kempton Park.
Hollow-core slab producer, the Echo Group of Companies’ engineering team came up with this new concept in retaining wall systems, called Echo Gravity Retaining Walling (EGRW), for the Green Cross wall, which is 135m long and varies between 2,5m to 5,7m high.
“The original intention was to construct an in-situ retaining wall,” says Echo’s technical director, Daniel Petrov. “Echo’s engineers, however, believed that a precast concrete wall would offer a more cost-effective option and submitted an alternative design proposal based on the use of pre-stressed, hollow-core slabs in combination with geotextile membrane. The design offered substantial savings in reinforced concrete and formwork, not to mention considerably faster construction times.
“When the decision to go the EGRW route was taken, an in-situ wall foundation and steel starter bars were already in place and to minimise costs, we incorporated these elements into the EGRW design,” Petrov explains.
The top of the wall was finished with precast concrete coping for further aesthetic appeal.
Petrov adds that precast retaining walls are generally built considerably faster than in-situ walling.
“Moreover, because our hollow-core slabs are manufactured in a factory environment in compliance with Echo’s stringent quality control measures, we are able to provide a top-quality end-product on a consistent basis.”
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New walling concept facts:
– Precast concrete.
– Pre-stressed hollow-core slabs combined with geotextile membrane.
– Substantial cost savings.
– Faster construction times.