1887

oa Civil Engineer in South Africa - A 20 km concrete canal lining without joints

 

Abstract

Most canals with concrete linings have joints at regular close intervals to control cracking of the concrete due to shrinkage and thermal movements. Whereas such canals are usually taken out of service for regular maintenance of the joint sealants, the Zuikerbosch canal was designed to operate continuously. The concrete lining was therefore designed to have no joints at all, with the size and spacing of the cracks controlled by high tensile steel wire reinforcement in accordance with the then newly published British Code BS 5337 for water retaining structures.


Crack spacings and crack widths were found to be larger than the values calculated according to BS 5337. Nevertheless a concrete canal lining without joints was shown to be a workable proposition.

Kanale wat met beton uitgevoer is, het meesal voeë op kort reëlmatige afstande om krake wat weens krimping en termiese beweging ontstaan, te beheer. Terwyl sulke kanale gewoonlik buite bedryf gestel moet word vir die gereelde instandhouding van voegverseëling, is die Zuikerboschkanaal ontwerp om voltyds bedryf te word. Die voering van beton is gevolglik ontwerp om geheel en al sonder voeë te wees terwyl die wydte en spasiëring van krake beheer word deur draad wapening van trekvaste staal wat voorsien is volgens die toenmalige pasgepubliseerde Britse Kode BS 5337 vir waterhoudende strukture. Daar is gevind dat kraakwydtes en kraakspasiëring in werklikheid groter is as die waardes volgens BS 5337 bereken. Nogtans is dit getoon dat 'n betonkanaalvoering sonder voeë volkome uitvoerbaar is.

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/content/civeng1/26/10/EJC24937
1984-10-01
2016-12-05
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