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Brock Civil Engineering constructed a 350m long and 7m high sound insulation bund at Liverpool's John Lennon airport in only seven weeks using Tensar geotextiles.

Built for a runway extension, the bund will reduce noise for the historic Speke Hall nearby, local residents and users of the airport car parks.

Using geogrids avoided the time and expense of wrap-around techniques for the steep faces.

The 40,000m3 bund was built over sand using Basetex high strength knitted geotextile followed by compacted layers of locally-won sand fill.

These were reinforced with horizontal lengths of 55RE and 40RE uniaxial grid at 500mm vertical intervals. The bund was finished with a 3-D antierosion mat anchored in trenches at the base.

Consultant for the contract was Scott Wilson and the management contractor was Bovis Lend Lease.

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