Scaffold accidents relative to South African construction
- Authors: Rantsatsi, Ndaleni Phinias
- Date: 2018
- Subjects: Construction industry -- Accidents -- South Africa , Construction industry -- Safety measures -- South Africa Building -- Accidents Accidents -- Prevention
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/35114 , vital:33627
- Description: The aim of this research is to highlight the types, frequency and causes of accident experienced by the scaffold workers on construction sites. As a result, provide recommendations on how to prevent or reduce accidents of scaffolding contractors on construction sites A review of related literature was conducted, primarily to avoid repeating existing research, to generate new findings. The quantitative research approach was adopted, and a non-experimental research design was used for this research which prompted the use of questionnaires for scaffold site management and scaffold workers. The sampling included site scaffold management, supervisors, health and safety practitioners, scaffold labourers, scaffold fixers/erectors, scaffold team leaders/ charge hands and scaffold inspectors in the South African construction industry in all nine provinces. The research findings revealed that slips, trips and falls accidents, struck by accidents and caught in/between accidents were the common accidents affecting scaffold workers on construction sites. The results further revealed that unsafe acts and conditions were the main causes of scaffold accidents. The empirical findings also revealed that most scaffold accidents occur during dismantling, manual handling and erection of scaffolding. The respondents are mostly working in the Limpopo and Mpumalanga provinces of South Africa. The research is vitally important for construction industry, scaffold contractors, clients and South African Department of Labour. It is recommended that a national accident register system be developed where accidents are captured and analysed to prevent possible accidents relative to scaffold contractors.
- Full Text:
- Date Issued: 2018
- Authors: Rantsatsi, Ndaleni Phinias
- Date: 2018
- Subjects: Construction industry -- Accidents -- South Africa , Construction industry -- Safety measures -- South Africa Building -- Accidents Accidents -- Prevention
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/35114 , vital:33627
- Description: The aim of this research is to highlight the types, frequency and causes of accident experienced by the scaffold workers on construction sites. As a result, provide recommendations on how to prevent or reduce accidents of scaffolding contractors on construction sites A review of related literature was conducted, primarily to avoid repeating existing research, to generate new findings. The quantitative research approach was adopted, and a non-experimental research design was used for this research which prompted the use of questionnaires for scaffold site management and scaffold workers. The sampling included site scaffold management, supervisors, health and safety practitioners, scaffold labourers, scaffold fixers/erectors, scaffold team leaders/ charge hands and scaffold inspectors in the South African construction industry in all nine provinces. The research findings revealed that slips, trips and falls accidents, struck by accidents and caught in/between accidents were the common accidents affecting scaffold workers on construction sites. The results further revealed that unsafe acts and conditions were the main causes of scaffold accidents. The empirical findings also revealed that most scaffold accidents occur during dismantling, manual handling and erection of scaffolding. The respondents are mostly working in the Limpopo and Mpumalanga provinces of South Africa. The research is vitally important for construction industry, scaffold contractors, clients and South African Department of Labour. It is recommended that a national accident register system be developed where accidents are captured and analysed to prevent possible accidents relative to scaffold contractors.
- Full Text:
- Date Issued: 2018
On the optical and electrical design of low concentrator photovoltaic modules
- Authors: Benecke, Mario Andrew
- Date: 2012
- Subjects: Photovoltaic cells -- Design and construction , Photovoltaic cells
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10543 , http://hdl.handle.net/10948/d1013102
- Description: The increasing interest in non-fossil fuel based electricity generation has caused a prominent boost for the renewable energy sector, especially the field of Photovoltaics (PV) with one of the main reasons being the decrease in cost of PV electricity generation. However, over the last few years a saturation in the efficiency of solar cells have been reached leading into a renewed search for other means to further reduce the cost of electricity generation from photovoltaic sources. One of the technologies that has attracted a lot of attention is low concentration photovoltaics (LCPV). LCPV investigates an alternative strategy to replace costly semiconductor material with relatively cheap optical materials by developing a Low Concentration Photovoltaic (LCPV) module. A LCPV module is divided into three subsystems, namely, the optical, electrical and thermal subsystem. This study focussed on the design, construction and characterisation of an optical subsystem accompanied by a thorough investigation into the design of an electrical subsystem. A facetted parabolic concentrator using a vertical receiver was modelled and a first prototype was constructed having a geometric concentration factor of 6.00 X. Upon electrical characterisation of this first vertical receiver LCPV prototype a concentration of only 4.53 X (receiver 1) and 4.71 X (receiver 2) was obtained. The first vertical receiver LCPV prototype did not reach the expected concentration factor due to optical losses and misalignment of optical elements. The illumination profile obtained from the reflector element was investigated and an undesirable non-uniform illumination profile was discovered. A second vertical receiver LCPV prototype was constructed in an attempt to improve on the first prototype, this second vertical receiver prototype had a geometrical concentration factor of 5.80 X. The results indicated a much improved illumination profile, yet still containing a number of non-uniformities. The second vertical receiver LCPV module yielded an operational concentration factor of 5.34 X. From the preliminary results obtained it was discovered that under concentrated illumination there was a limitation on the maximum power that could be obtained from the receiver. Upon further investigation it was discovered that this limitation was due to the higher current levels under concentrated illumination accompanied by a high series resistance of the receiver. This lead to the construction of new PV receivers, where this limitation could be minimised. 3 cell, 4 cell, 6 cell and 8 cell string configurations were constructed and used for the electrical characterisation of the prototypes. Due to non-uniformity of the illumination profile obtained from the second LCPV prototype a third vertical receiver LCPV prototype was constructed. This vertical receiver design illustrated more uniformity in the obtained illumination distribution and had a geometrical concentration factor of 4.61 X, although under operation only 4.26 X could be obtained. It is important to note that the geometric concentration factor does not account for reflective losses of the reflective material. One of the main reasons for the difficulty in obtaining a uniform illumination profile with the vertical receiver design is that the facetted reflector element is far away from the PV receiver. This enhances the effect of the slightest misalignment of any of the optical elements. This large distance also increases the effect of lensing from each facet. These factors lead to the consideration of a second design, which would counteract these factors. A horizontal receiver LCPV module design implementing a facetted parabolic reflector was considered to counteract these effects. From a mathematical model a horizontal receiver LCPV prototype was constructed having a geometrical concentration factor 5.3 X. The optical characterisation of the illumination profile showed a much improved illumination profile, which was much more uniform than the previous illumination profiles obtained from the other LCPV prototypes. The uniformity of the illumination profile could be seen in results obtained from the electrical characterisation where the concentrator reached operational concentration factor of 5.01 X. The reliability of the third vertical receiver LCPV prototype and the horizontal receiver LCPV prototype as well as the receivers were investigated by placing each receiver under stressed operational conditions for 60 sun hours. I-V characteristics were obtained after every five sun hours to investigate any signs of degradation. After 60 sun hours none of the receiver displayed any signs of degradation or reduction in electrical performance.
- Full Text:
- Date Issued: 2012
- Authors: Benecke, Mario Andrew
- Date: 2012
- Subjects: Photovoltaic cells -- Design and construction , Photovoltaic cells
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10543 , http://hdl.handle.net/10948/d1013102
- Description: The increasing interest in non-fossil fuel based electricity generation has caused a prominent boost for the renewable energy sector, especially the field of Photovoltaics (PV) with one of the main reasons being the decrease in cost of PV electricity generation. However, over the last few years a saturation in the efficiency of solar cells have been reached leading into a renewed search for other means to further reduce the cost of electricity generation from photovoltaic sources. One of the technologies that has attracted a lot of attention is low concentration photovoltaics (LCPV). LCPV investigates an alternative strategy to replace costly semiconductor material with relatively cheap optical materials by developing a Low Concentration Photovoltaic (LCPV) module. A LCPV module is divided into three subsystems, namely, the optical, electrical and thermal subsystem. This study focussed on the design, construction and characterisation of an optical subsystem accompanied by a thorough investigation into the design of an electrical subsystem. A facetted parabolic concentrator using a vertical receiver was modelled and a first prototype was constructed having a geometric concentration factor of 6.00 X. Upon electrical characterisation of this first vertical receiver LCPV prototype a concentration of only 4.53 X (receiver 1) and 4.71 X (receiver 2) was obtained. The first vertical receiver LCPV prototype did not reach the expected concentration factor due to optical losses and misalignment of optical elements. The illumination profile obtained from the reflector element was investigated and an undesirable non-uniform illumination profile was discovered. A second vertical receiver LCPV prototype was constructed in an attempt to improve on the first prototype, this second vertical receiver prototype had a geometrical concentration factor of 5.80 X. The results indicated a much improved illumination profile, yet still containing a number of non-uniformities. The second vertical receiver LCPV module yielded an operational concentration factor of 5.34 X. From the preliminary results obtained it was discovered that under concentrated illumination there was a limitation on the maximum power that could be obtained from the receiver. Upon further investigation it was discovered that this limitation was due to the higher current levels under concentrated illumination accompanied by a high series resistance of the receiver. This lead to the construction of new PV receivers, where this limitation could be minimised. 3 cell, 4 cell, 6 cell and 8 cell string configurations were constructed and used for the electrical characterisation of the prototypes. Due to non-uniformity of the illumination profile obtained from the second LCPV prototype a third vertical receiver LCPV prototype was constructed. This vertical receiver design illustrated more uniformity in the obtained illumination distribution and had a geometrical concentration factor of 4.61 X, although under operation only 4.26 X could be obtained. It is important to note that the geometric concentration factor does not account for reflective losses of the reflective material. One of the main reasons for the difficulty in obtaining a uniform illumination profile with the vertical receiver design is that the facetted reflector element is far away from the PV receiver. This enhances the effect of the slightest misalignment of any of the optical elements. This large distance also increases the effect of lensing from each facet. These factors lead to the consideration of a second design, which would counteract these factors. A horizontal receiver LCPV module design implementing a facetted parabolic reflector was considered to counteract these effects. From a mathematical model a horizontal receiver LCPV prototype was constructed having a geometrical concentration factor 5.3 X. The optical characterisation of the illumination profile showed a much improved illumination profile, which was much more uniform than the previous illumination profiles obtained from the other LCPV prototypes. The uniformity of the illumination profile could be seen in results obtained from the electrical characterisation where the concentrator reached operational concentration factor of 5.01 X. The reliability of the third vertical receiver LCPV prototype and the horizontal receiver LCPV prototype as well as the receivers were investigated by placing each receiver under stressed operational conditions for 60 sun hours. I-V characteristics were obtained after every five sun hours to investigate any signs of degradation. After 60 sun hours none of the receiver displayed any signs of degradation or reduction in electrical performance.
- Full Text:
- Date Issued: 2012
Investigating the feasibility of an indoor aquatic centre for the Nelson Mandela Bay Metropole
- Janse van Rensburg, Philippus Jacobus
- Authors: Janse van Rensburg, Philippus Jacobus
- Date: 2007
- Subjects: Aquatic sports facilities -- South Africa -- Port Elizabeth -- Designs and plans , Sports facilities -- South Africa -- Port Elizabeth , Recreation centers -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8739 , http://hdl.handle.net/10948/791 , Aquatic sports facilities -- South Africa -- Port Elizabeth -- Designs and plans , Sports facilities -- South Africa -- Port Elizabeth , Recreation centers -- South Africa -- Eastern Cape
- Description: The purpose of this study was to investigate the feasibility of an Indoor Aquatic Centre for the Nelson Mandela Bay Metropole. The main problem was to establish the minimum aquatic facilities an Indoor Aquatic Centre must have, to be able to host National and International aquatic events. The sub problems identified to address the main problem were as follows: - Should accommodation be available at the Indoor Aquatic Centre? - Should medical facilities be available at the Indoor Aquatic Centre? - Should there be a gymnasium at the Indoor Aquatic Centre? - Should there be food malls available at the Indoor Aquatic Centre? - Will sports tourism in the Nelson Mandela Bay Metropole benefit from an Indoor Aquatic Centre? In this study the researcher discusses current tourism opportunities, possible sports tourism opportunities and the current aquatic facilities the Nelson Mandela Bay Metropole has to offer. From the discussion regarding these issues it was found that the metropole do offer many attraction opportunities including the following: - Adventure and Sport; - Agriculture; - Arts and Culture; - Business and Conferencing; - Coastal and Beaches; - Entertainment and Shopping; - Historical; - Wild Life and Nature. Adventure and Sport attractions contribute to sports tourism in the metropole and an Indoor Aquatic Centre could enable the metropole to improve sports tourism figures to the metropole. Sports tourism is defined as any tourism that is linked with a sports event. The conclusion can be made that the main initiative for sports tourism is to host a major sporting event to attract tourists. Adding other tourist attractions makes the destination more attractive. It is also important that the community is educated and informed about sports tourism so that the tourist and the community benefits from the event. Indoor Aquatic Centres found in countries like Australia, Canada, Europe, Russia, The Far East, United Kingdom and the United States of America, were discussed to identify the minimum requirements for an Indoor Aquatic Centre. The literature study has shown that the Indoor Aquatic Centre should be a multi purpose centre with a minimum of two heated pools and leisure facilities included. This will enable the centre to generate different streams of income to enhance sustainability. The aquatic centre should also be designed to host National and International events, but not necessarily for Olympic Games events. An empirical study was done to see if the respondents agree on the minimum requirements for an Indoor Aquatic Centre, identified by the literature study and if they agree that sports tourism within the Nelson Mandela Bay Metropole will benefit from an Indoor Aquatic Centre. The conclusion of the empirical study is that the respondents’ view correlate with the information found during the literature study regarding the minimum requirements for an Indoor Aquatic Centre listed as follows: - The minimum number of heated pools are two consisting of a fifty metre ten lane pool and a twenty five metre ten lane pool; - A food mall that consists of a restaurant, fast food stalls and a food store; - Medical facilities, conference facilities, gymnasium and other leisure facilities must also be available; - Accommodation facilities must be available and consists of two and three bedroom fully serviced apartments; - The Indoor Aquatic centre must be able to have seating for 2000 people and parking for 1000 vehicles. The study has addressed the main problem and the sub problems, but further research needs to be conducted regarding the funding of the Indoor Aquatic Centre as this issue was not successfully addressed. More information is needed regarding the different ways of funding and who the stakeholders should be in this process.
- Full Text:
- Date Issued: 2007
- Authors: Janse van Rensburg, Philippus Jacobus
- Date: 2007
- Subjects: Aquatic sports facilities -- South Africa -- Port Elizabeth -- Designs and plans , Sports facilities -- South Africa -- Port Elizabeth , Recreation centers -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8739 , http://hdl.handle.net/10948/791 , Aquatic sports facilities -- South Africa -- Port Elizabeth -- Designs and plans , Sports facilities -- South Africa -- Port Elizabeth , Recreation centers -- South Africa -- Eastern Cape
- Description: The purpose of this study was to investigate the feasibility of an Indoor Aquatic Centre for the Nelson Mandela Bay Metropole. The main problem was to establish the minimum aquatic facilities an Indoor Aquatic Centre must have, to be able to host National and International aquatic events. The sub problems identified to address the main problem were as follows: - Should accommodation be available at the Indoor Aquatic Centre? - Should medical facilities be available at the Indoor Aquatic Centre? - Should there be a gymnasium at the Indoor Aquatic Centre? - Should there be food malls available at the Indoor Aquatic Centre? - Will sports tourism in the Nelson Mandela Bay Metropole benefit from an Indoor Aquatic Centre? In this study the researcher discusses current tourism opportunities, possible sports tourism opportunities and the current aquatic facilities the Nelson Mandela Bay Metropole has to offer. From the discussion regarding these issues it was found that the metropole do offer many attraction opportunities including the following: - Adventure and Sport; - Agriculture; - Arts and Culture; - Business and Conferencing; - Coastal and Beaches; - Entertainment and Shopping; - Historical; - Wild Life and Nature. Adventure and Sport attractions contribute to sports tourism in the metropole and an Indoor Aquatic Centre could enable the metropole to improve sports tourism figures to the metropole. Sports tourism is defined as any tourism that is linked with a sports event. The conclusion can be made that the main initiative for sports tourism is to host a major sporting event to attract tourists. Adding other tourist attractions makes the destination more attractive. It is also important that the community is educated and informed about sports tourism so that the tourist and the community benefits from the event. Indoor Aquatic Centres found in countries like Australia, Canada, Europe, Russia, The Far East, United Kingdom and the United States of America, were discussed to identify the minimum requirements for an Indoor Aquatic Centre. The literature study has shown that the Indoor Aquatic Centre should be a multi purpose centre with a minimum of two heated pools and leisure facilities included. This will enable the centre to generate different streams of income to enhance sustainability. The aquatic centre should also be designed to host National and International events, but not necessarily for Olympic Games events. An empirical study was done to see if the respondents agree on the minimum requirements for an Indoor Aquatic Centre, identified by the literature study and if they agree that sports tourism within the Nelson Mandela Bay Metropole will benefit from an Indoor Aquatic Centre. The conclusion of the empirical study is that the respondents’ view correlate with the information found during the literature study regarding the minimum requirements for an Indoor Aquatic Centre listed as follows: - The minimum number of heated pools are two consisting of a fifty metre ten lane pool and a twenty five metre ten lane pool; - A food mall that consists of a restaurant, fast food stalls and a food store; - Medical facilities, conference facilities, gymnasium and other leisure facilities must also be available; - Accommodation facilities must be available and consists of two and three bedroom fully serviced apartments; - The Indoor Aquatic centre must be able to have seating for 2000 people and parking for 1000 vehicles. The study has addressed the main problem and the sub problems, but further research needs to be conducted regarding the funding of the Indoor Aquatic Centre as this issue was not successfully addressed. More information is needed regarding the different ways of funding and who the stakeholders should be in this process.
- Full Text:
- Date Issued: 2007
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