Planning for the present Du Toitskloof project began as long ago as 1970. Owing to the energy crisis in 1973 and subsequent fuel supply problems for South Africa, then, were insufficient funds available to proceed with construction of the project at the earliest opportunity. This paper describes the history of the planning as well as giving details on the various facets that had to be considered during the planning and design phases. The tunnel was completed and opened to traffic on 18 March 1988 by State President P W Botha, who also named it the Huguenot Tunnel.
The construction methods employed and the specialized equipment used on the project are described. Details of the design aspects and the construction of the soft ground section to the second tunnel are provided. An alternative technique was used: 'multiple face' excavation supported by vacuum drainage of the ground water table.
Long high-density road tunnels are potentially hazardous. Special installations are required to render them safe and to minimize the risk of accidents. This article reviews the electrical and mechanical equipment installed in the Du Toitskloof Tunnel (now renamed the Huguenot Tunnel), the longest road tunnel in Southern Africa.
The Du Toitskloof Tunnel project was the largest tender ever let by the National Transport Commission when it was awarded in October 1984. it has also made history by being the first major civil engineering contract in South Africa to make use of the selected subcontract format. This paper describes the main principles of selected subcontracting and how it was successfully used for the tunnel project. Comments are also given from both the consulting engineer's and the contractor's points of view on the use of this contract form on Du Toitskloof.