Changes

Jump to: navigation, search

Hand auger - Vonder rig

5 bytes removed, 05:34, 27 April 2012
no edit summary
{{stub}}
[[Image:Treadle_pump_icon.png|right]]
[[Image:Vonder rig in action.jpg|thumb|right|300px250px|Vonder rig in action]]
__NOTOC__
The Vonder rig is a [[Hand auger - general|hand auger method]] method that uses a heavy tripod, a winch, and a working table. It has been used extensively in Zimbabwe and distributed widely in sub-Saharan Africa. The cutting tool (auger head) is rotated to cut into the ground, and then withdrawn to remove excavated material. This is repeated until the required depth is reached.
==Suitable conditions ==
The Vonder rig is suitable for unconsolidated formations: sand, silt and soft clay. Stiff clays, hard materials and gravels are difficult or impossible to drill through and to remove (unless augering is combined with [[percussion - general|percussion]]).
 
{{procontable | pro=
- Slow compared with other methods.
}}
 
==Construction, operations and maintenance==
[[Image:Diagram of a vonder rig.jpg|thumb|right|300px250px|Diagram of a vonder rig]]
The Vonder rig makes use of a tripod and working table and is therefore more expensive than the conventional augering tools. However, use of the worktable and tripod ensure a straight borehole.
====Suppliers====
[[Image:Work table and auger bit.jpg|thumb|right|300px250px|Work table and auger bit.]]
* V&W Engineering Ltd, Zimbabwe (49 Leyland Road, P.O.Box 131,Harare). - Produces the Vonder rig.
* Van Reekum Materials, Netherlands - Drilling equipment, hand auger and percussion drilling - http://www.reekum.nl
* Eijkelkamp Agrisearch Equipment, Netherlands - Drilling equipment and manuals on hand auger and percussion gouges - http://www.eijkelkamp.nl
 
==Costs==
 
==Field experiences==
* Multi-service procedures for well-drilling operations, field manual chapter 9, US Military Chapter 9, alternative well construction, manual drilling techniques - [http://www.paulsawyers.com/pdfs/FM_5_484.pdf Download].
 
==Acknowledgements==
Winona
Akvopedia-spade, akvouser, bureaucrat, emailconfirmed, staff, susana-working-group-1, susana-working-group-10, susana-working-group-11, susana-working-group-12, susana-working-group-2, susana-working-group-3, susana-working-group-4, susana-working-group-5, susana-working-group-6, susana-working-group-7, susana-working-group-8, susana-working-group-9, susana-working-group-susana-member, administrator, widget editor
30,949
edits
Retrieved from "https://akvopedia.org/wiki/Special:MobileDiff/9589"

Navigation menu