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Nov 2009

 

BURUNDI - Contractor Trials GPS Technology On New Road Projects - cont

One of the contractors working on the RN12 is the French company, Sogea-Satom and important pieces of equipment during the works are two Cat 14M motor graders equipped with AccuGrade dual GPS systems with cross-slope capabilityOne of the contractors working on the RN12 is the French company, Sogea-Satom and important pieces of equipment during the works are two Cat 14M motor graders equipped with AccuGrade dual GPS systems with cross-slope capability.

These are part of an extensive fleet of Cat equipment that includes seven track-type tractors, five excavators, two wheeled loaders and six graders. The equipment was supplied by local dealer, Tractafric.

The graders work in unison with a D7R II, also on site and equipped with AccuGrade-ready D7R II.

This combination gives the three machines additional performance and productivity on the road project by sharing the AccuGrade machine control systems according to job progress.

While the initial requirement was to equip both 14M motor grades with AccuGrade dual GPS systems, the ability to also have a track-type tractor with guidance was reckoned to offer significant benefits with earthmoving activity ahead of road formation.

These two are the first systems being used by the contractor and replace traditional surveying and staking methods on its earthmoving projects. The system is being thoroughly evaluated on three road projects in Burundi that are valued at €70m.

The graders work in unison with a D7R II, also on site and equiped with AccuGrade-ready D7R II. Other major works involved are 35 km RN14 Kirundo-Gaseyni trunk road, the 104 km RN12 Gitega-Muyinga trunk road and 31 km of road and pavement refurbishment in the capital, Bujumbura.

The longest section of road is the RN12 which runs through a mountainous region some 1500-1600 metres above sea level and is heavily shadowed by trees and vegetation that could, in some areas mask satellite signals.

However, Sogea-Satom reports that after 12 months of using the systems on-site, it has given +/- 1 centimetre accuracy when the road formation is surveyed.

The first application was with the D7R, removing 30 cm of poor material to allow foundation and road base materials to be installed. This work was previously done by an excavator and just one truck, with productivity at just 100 metres a day. As a result, in many instances, up to 50 cm of material was being unnecessarily removed.

Using the D7R with AccuGrade, 100 metres of road were completed in 30 minutes, vastly improving productivity and enabling final passes to be performed in auto mode at ± 2 centimetres.

On-site surveyors now have more time for data preparation and grade checking, and they have been reporting improved quality and earlier completion at different stages of the road building programme.With the 14M motor graders, the quality of work has been dramatically improved too, compared to relying on stakes every 25 metres.

On-site surveyors now have more time for data preparation and grade checking, and they have been reporting improved quality and earlier completion at different stages of the road building programme.

 

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