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The design and development of a working prototype machine to mechanically refurbish/create earth roads in South Africa

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dc.contributor.author Martinez, Francisco Lardin
dc.date.accessioned 2010-03-10T06:25:19Z
dc.date.available 2010-03-10T06:25:19Z
dc.date.issued 2010-03-10T06:25:19Z
dc.date.submitted 2008
dc.identifier.uri http://hdl.handle.net/10210/3069
dc.description M.Ing. en
dc.description.abstract Terragrader (Pty) Ltd developed a working prototype for a machine capable of making and upgrading earth roads. The working prototype was based on practical engineering sense and any available components in order to produce a “concept proving” machine. As a consequence, a new working prototype was required which would include sound mechanical engineering design to address mass production requirements and any operational and maintenance issues. To achieve a sound prototype design, extensive research regarding earth road construction and maintenance was conducted. This dissertation documents the design and development of the new working prototype for a machine which will mechanically refurbish existing earth roads or create new earth roads in rural or informal areas in South Africa. The concept consists of a wheeled machine towed behind a commercial tractor. The tractor will provide the pulling force required to: • tear up (scarify) the existing earth road/ground. • grade and form the road shape. • stabilize the formed earth road by light compacting. The hydraulic pressure needed to actuate the machine is provided by the hydraulic power system integrated into the tractor. The machine will require a tractor driver, and one operator sitting at the rear of the machine. From this position the operator is able to observe and control every aspect of the earth road manufacturing process. It is envisaged that the production machine will be operated and maintained by semi skilled/unskilled workers, therefore, the new production working prototype must take this into account. The project, when implemented by Terragrader (Pty) Ltd will include training and instruction on the use and maintenance of the production machine. The research part of the project was done within several complimentary fields to gain a full understanding of the design requirements and constraints. The following complimentary fields were researched: • To determine the requirements of earth road design in South Africa, • To understand the make up of the earth conditions in South Africa, the types of road defects, the repair and construction methods applied in South Africa. • The amount of pulling force required to perform a grading, scarifying and compacting operation. As a consequence, a number of formulae and recommendations were identified and were utilized to quantify the pulling force required, thereby confirming that the tractor chosen by Terragrader (Pty) Ltd was adequate. • The types of existing road construction machinery have been researched and documented. A survey of the current commercially available earth construction machinery, in particular Graders, has been conducted to identify operating capacities, and compare these with the design criteria as specified. • Since the first working prototype was based on “engineering sense” only, mechanical engineering design practice was used to ensure that all initial design shortcomings and deficiencies were addressed to facilitate mass production, operation and maintenance. As this dissertation is being completed, the new production working prototype is being manufactured and any difficulties or improvements are being addressed and integrated into the design. The manufacturing of this second prototype will be completed towards the end of 2007, with the design finalization taking place once the prototype testing is completed. en
dc.language.iso en en
dc.subject Road machinery design and construction en
dc.subject Earth roads design and construction en
dc.subject Earth roads maintenance and repair en
dc.subject Earthwork mathematical models en
dc.title The design and development of a working prototype machine to mechanically refurbish/create earth roads in South Africa en
dc.type Mini-Dissertation en

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