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Guided Auger Boring (GAB)

(Sometimes referred to as Guided Thrust Boring)

Compact boring equipment operating from shafts or pits as small as 2.40-metre diameter, Allen Watson designs, own and operate the widest, most powerful, versatile range of Guided Auger Boring systems. With jacking forces from 85te to 160te we provide the total solution for installation of gravity pipes, cable ducts or simply where accuracy is paramount.

We are extensively using this as a safe and cost effective alternative to micro tunnelling, timber headings and in many instances open cut.

What is Guided Auger Boring?

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Using a digital camera giving real-time monitoring, a pilot bore is driven to line and level, once complete, the auger follows the pilot prior to pipe installation.

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Advantages include:

• Accurate installations +/- 25mm over distances up to 100 metres possible.
• Can operate from shafts as small as 2.40 metre diameter.
• Ideal for gravity drainage pipes, cable ducts or accurate installations.
• Can install variety of pipe materials, Clay, Steel, Plastic or GRP.
• Dry method of installation - Does not generate slurry.
• Auger boring is unaffected by surface obstacles.
• No disruption to surface, buildings, road, river, rail or traffic.
• By boring underground the working area is confined to points of entry and exit only.
• Can be used to install pipes in changeable ground conditions.
• Auger boring is relatively quick and in many cases has lower overall costs.

Typical Applications

Steel pipes and ducts from 100mmØ up to 1016mmØ or Vitrified Clay drainage pipes from DN150 up to DN800. Distances from 5 metres up to 100 metres have been successfully installed under Railways, Roads, Rivers, Airports, Buildings, Contaminated landfill sites and Sites of Special Scientific Interest.

Crossings can be for Water, Oil, Gas, Electric, Sewage, Chemicals, Communication Ducts and Outfalls.