Sabinet | Volume 33, Issue 2
Volume 33, Issue 2, 1991
Civil Engineer in South Africa - Volume 33, Issue 2, February 1991
Volume 33, Issue 2, February 1991
Analysis of panel data for transportation planning : technical paper
Authors: T. Hardwick and C. Wilmot
Source: Civil Engineer in South Africa 33, pp 45 –49 (1991)
The National Black Panel (NBP) was originally established by the Department of Transport to measure the attitudes of black commuters with regard to transport issues and to monitor their response to change. The research project on which this paper is based analysed the results of two panel surveys carried out in March and August 1988. Eleven major urban areas within South Africa were chosen to be represented on the NBP. The aim of the research was to understand black travel and to analyse changes in travel patterns between surveys in order to identify trends.
Although it is common knowledge that there has recently been a proliferation of combi-taxis, one of the findings of this study is that combi-taxis have emerged as serious competitors to conventional public transport. In August 1988, 30 percent of commuters made use of taxis. Another finding was that there was little dissatisfaction with the existing train service. The most urgent and important aspects of transport that respondents felt required attention related to buses and combi-taxis. Although certain trends were identified between the two surveys, it is difficult with only two data sets to determine the true causes of these trends.
Die Nasionale Swart Paneel (NSP) is oorspronklik deur die Departement van Vervoer tot stand gebring om die houding van swart pendelaars met betrekking tot vervoeraangeleenthede te meet en om hul reaksies met betrekking tot veranderings te monitor. Die navorsingsprojek waarop hierdie verhandeling gebaseer is, het die uitslae van twee paneelopnames in Maart en Augustus 1988 geanaliseer. Elf groot stedelike gebiede binne Suid-Afrika is gekies om op die NSP te dien. Die doel met die navorsing was om swart vervoer te verstaan en om veranderings in vervoerpatrone tussen opnames te analiseer om tendense te identifiseer.
Alhoewel dit wyd bekend is dat daar onlangs &apos;n oplewing van kombi-taxi&apos;s was, het die studie gevind dat die kombi-taxi nou &apos;n sterk mededinger vir konvensionele openbare vervoer geword het. In Augustus 1988, het 30 persent van die pendelaars wat ondervra is, van taxi&apos;s gebruik gemaak. Ander bevindings is onder andere dat daar min ontevredenheid met die bestaande treindienste bestaan. Die dringendste en belangrikste aspek van vervoer wat respondente voel aandag behoort te geniet, verwys na busse en kombi-taxi&apos;s.
A mercury column vertical movement measurement device for geotechnical engineering : technical paper
Author I. Luker
Source: Civil Engineer in South Africa 33, pp 51 –54 (1991)
Methods of measuring the vertical movement of points below ground are briefly reviewed, whereafter the application of one particular method is closely examined. The use of a mercury manometer, where only one leg of the mercury column is visible, is shown to be viable in South African temperature conditions and an improved method of determining the level of a buried settlement measuring cell, using a mercury column as a switch, is described.
Repair of a concrete tower block at the University of Durban-Westville : technical paper
Author B.K. Dougherty
Source: Civil Engineer in South Africa 33, pp 55 –61 (1991)
A contract dealing with large-scale repairs to a concrete tower block is described. This arose from widespread corrosion of the reinforcement, and some 4 500 separate spalls were eventually identified. Data is provided on the cost, size, frequency and distribution of repairs and ways are considered of dealing with large fluctuations in costs that can occur in contracts of this type.
&apos;n Kontrak word beskryf wat oor grootskaalse herstelwerk aan &apos;n betontoringblok handel. Hierdie werk is genoodsaak as gevolg van die uitgebreide korrosie van die wapeningstaal, en ongeveer 4 500 afsonderlike gevalle van afvalsplinters is uiteindelik geidentifiseer. Data ivm die koste, omvang, frekwensie en distribusie van herstelwerk word verskaf en metodes word oorweeg om die groot wisselings in koste wat in hierdie soort kontrak kan voorkom, te oorbrug.