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Driving nails

KUALA LUMPUR-BASED Terranusa has recently completed one of Malaysia's largest soil nailing projects. More than 10,000 nails were inserted on a road rehabilitation project in the popular Cameron Highlands, suffering the effects of heavy congestion, caused by holidaymakers and by trucks transporting local produce, and frequent mudslides.

On the 15km stretch between Brinchang to Lojing, the RM75M (-96M) contract included soil stabilisation and construction of horizontal drains, berm drains, roadside drains and culverts.

Terranusa used a combination of soil nailing, turfing, hydroseeding and retaining walls to stabilise the roadside embankments, which rise to 36m at gradients of up to 1:2.

According to managing director, Nik Ramlan, the project was the first in Malaysia to use the technique of planting millet and weed grass on a 45infinity angle along some slopes.

The soil nails were installed perpendicularly into the slopes, at a rate of up to 30/day, using a pneumatic drill rig powered by one of the company's Atlas Copco compressors, including two XATS 156 Dds and illustrated, an Atlas Copco XAHS 365 Md; to ensure an efficient supply of compressed air for drill flushing operations.

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