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New page: {{stub}} right __NOTOC__ Diagram of a vonder rig The Vonder rig is a [[Hand auger - general|hand au...
{{stub}}
[[Image:Treadle_pump_icon.png|right]]
__NOTOC__
[[Image:Diagram of a vonder rig.jpg|thumb|right|150px|Diagram of a vonder rig]]
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 The cutting tool (auger head) is rotated to cut into the ground, and then withdrawn to remove excavated material.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.
==History and social context==
The Vonder rig was developed in the early 80's and is manufactured in Zimbabwe.
==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=
- Vonder rig ensures a straight borehole
| con=
- Tools for vonder rig are more expensive than conventional hand augering tools
- Slow compared with other methods.
}}
[[Image:Vonder rig in action.jpg|thumb|right|150px|Vonder rig in action]]
==Technical specification==
====Operation====
====Maintenance====
====Manufacturing ====
[[Image:Work table and auger bit.jpg|thumb|right|150px|Work table and auger bit]]
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.
Equipment is commercially produced by V&W engineering in Zimbabwe. Local production is possible.
====Suppliers====
* 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
==Cost==
==Country experiences==
The vonder rig is widely used in Malawi, Kenya, South Africa and Zimbabwe.
==Manuals==
* Self-help wells, R.G. Koegel, FAO 1985. Internet manual on hydrogeology, well constructions, all drilling techniques - [http://www.fao.org/docrep/X5567E/x5567e00.HTM website].
==Movies==
== Acknowledgements==
* The basis for the material on this page was obtained from a desk study shortly to be published on the website of the [http://www.practicafoundation.nl/ Practica Foundation], and from the [http://www.rwsn.ch/ Rural Water Supply Network], and specifically its [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822 manual drilling section].
==External Links==
* Human-Powered Drilling Technologies, Richard Carter, Cranfield University, 2005 - An overview of human-powered drilling technologies - [http://www.rwsn.ch/documentation/skatdocumentation.2005-11-15.5533687184/file Download].
* 'Private Sector Participation in Low Cost Water Well Drilling', Cranfield University, 2001. Article on private sector participation in low cost water well drilling in Africa. [https://dspace.lib.cranfield.ac.uk/bitstream/1826/3038/1/Private%20Sector%20Participation%20in%20Low%20Cost%20Water%20Well%20Drilling-2001.pdf Download].
* Rural Water Supply Network - Useful network and website for information and downloads related to Rural Water Technologies - [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822 Hand drilled wells]. General [http://www.rwsn.ch website].
* Drilling Boreholes for Hand pumps, Peter Wurzel, SKAT Switzerland, 2001 - A book on hydrogeology, well construction, drilling techniques, well development - [http://www.skat.ch/publications/prarticle.2005-09-29.5069774463/prarticle.2006-11-02.5180575226/skatpublication.2006-11-02.0404244520/file Download]. Website of [http://www.skat.ch SKAT]
* Low-cost shallow tube well construction in West Africa, M. Sonau, FAO - An overview of shallow tube well drilling techniques - [http://www.fao.org/docrep/w7314e/w7314e0v.htm website]. Website of [http://www.fao.org/documents/ FAO documents].
* Technical note 43. Simple drilling methods, Bob Elson and Rod Shaw, WEDC - An overview of simple drilling methods [http://www.lboro.ac.uk/well/resources/technical-briefs/43-simple-drilling-methods.pdf Download]. Website of [http://www.lboro.ac.uk/well/resources/technical-briefs/ Loughborough University Technical Briefs section]. Website of [http://www.lboro.ac.uk/well/ Loughborough University WELLS].
* A Water Handbook, Technical Guidelines Series, UNICEF, 1999 - Programming and implementation. [http://www.unicef.org/wash/files/Wat_e.pdf Download].
* Technology notes, section 7; Tube wells and boreholes, WaterAid - An overview of human-powered drilling technologies. [http://www.wateraid.org/documents/plugin_documents/technology_notes_2008.pdf Download]. Website of [http://www.wateraid.org/uk Wateraid.org].
* Water for the World, Technical note series rws 2, USAID 1982 - Technical notes on methods of developing of groundwater, manual drilling techniques. [http://www.lifewater.org/resources/ground_water.html Website Livewater International].
* 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].
==References==
{{Joinus}}
[[Image:Treadle_pump_icon.png|right]]
__NOTOC__
[[Image:Diagram of a vonder rig.jpg|thumb|right|150px|Diagram of a vonder rig]]
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.
==History and social context==
The Vonder rig was developed in the early 80's and is manufactured in Zimbabwe.
==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=
- Vonder rig ensures a straight borehole
| con=
- Tools for vonder rig are more expensive than conventional hand augering tools
- Slow compared with other methods.
}}
[[Image:Vonder rig in action.jpg|thumb|right|150px|Vonder rig in action]]
==Technical specification==
====Operation====
====Maintenance====
====Manufacturing ====
[[Image:Work table and auger bit.jpg|thumb|right|150px|Work table and auger bit]]
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.
Equipment is commercially produced by V&W engineering in Zimbabwe. Local production is possible.
====Suppliers====
* 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
==Cost==
==Country experiences==
The vonder rig is widely used in Malawi, Kenya, South Africa and Zimbabwe.
==Manuals==
* Self-help wells, R.G. Koegel, FAO 1985. Internet manual on hydrogeology, well constructions, all drilling techniques - [http://www.fao.org/docrep/X5567E/x5567e00.HTM website].
==Movies==
== Acknowledgements==
* The basis for the material on this page was obtained from a desk study shortly to be published on the website of the [http://www.practicafoundation.nl/ Practica Foundation], and from the [http://www.rwsn.ch/ Rural Water Supply Network], and specifically its [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822 manual drilling section].
==External Links==
* Human-Powered Drilling Technologies, Richard Carter, Cranfield University, 2005 - An overview of human-powered drilling technologies - [http://www.rwsn.ch/documentation/skatdocumentation.2005-11-15.5533687184/file Download].
* 'Private Sector Participation in Low Cost Water Well Drilling', Cranfield University, 2001. Article on private sector participation in low cost water well drilling in Africa. [https://dspace.lib.cranfield.ac.uk/bitstream/1826/3038/1/Private%20Sector%20Participation%20in%20Low%20Cost%20Water%20Well%20Drilling-2001.pdf Download].
* Rural Water Supply Network - Useful network and website for information and downloads related to Rural Water Technologies - [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822 Hand drilled wells]. General [http://www.rwsn.ch website].
* Drilling Boreholes for Hand pumps, Peter Wurzel, SKAT Switzerland, 2001 - A book on hydrogeology, well construction, drilling techniques, well development - [http://www.skat.ch/publications/prarticle.2005-09-29.5069774463/prarticle.2006-11-02.5180575226/skatpublication.2006-11-02.0404244520/file Download]. Website of [http://www.skat.ch SKAT]
* Low-cost shallow tube well construction in West Africa, M. Sonau, FAO - An overview of shallow tube well drilling techniques - [http://www.fao.org/docrep/w7314e/w7314e0v.htm website]. Website of [http://www.fao.org/documents/ FAO documents].
* Technical note 43. Simple drilling methods, Bob Elson and Rod Shaw, WEDC - An overview of simple drilling methods [http://www.lboro.ac.uk/well/resources/technical-briefs/43-simple-drilling-methods.pdf Download]. Website of [http://www.lboro.ac.uk/well/resources/technical-briefs/ Loughborough University Technical Briefs section]. Website of [http://www.lboro.ac.uk/well/ Loughborough University WELLS].
* A Water Handbook, Technical Guidelines Series, UNICEF, 1999 - Programming and implementation. [http://www.unicef.org/wash/files/Wat_e.pdf Download].
* Technology notes, section 7; Tube wells and boreholes, WaterAid - An overview of human-powered drilling technologies. [http://www.wateraid.org/documents/plugin_documents/technology_notes_2008.pdf Download]. Website of [http://www.wateraid.org/uk Wateraid.org].
* Water for the World, Technical note series rws 2, USAID 1982 - Technical notes on methods of developing of groundwater, manual drilling techniques. [http://www.lifewater.org/resources/ground_water.html Website Livewater International].
* 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].
==References==
{{Joinus}}