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Sentech Tower
The Sentech Tower, previously named the Albert Hertzog Tower and commonly known as the Brixton Tower, is a concrete television tower in the Brixton suburb of Johannesburg, South Africa, near the top of the Brixton Ridge. It is a well-known and easily identifiable landmark in the city, alongside its "architectural cousin", the Hillbrow Tower. Although always intended for both radio and television transmission, it carried only FM radio transmissions until the 1970s. History The tower's construction commenced in 1961, and was completed in 1962. The tower was designed by Ove Arup and Partners and built by Christiani and Nielsen SA. Upon completion, the Brixton Tower was the tallest man-made structure in Africa in its time until it was overtaken by the Hillbrow Tower. It cost R300,000 to construct. The first transmission took place 22 December 1961. Presently, Sentech broadcasts 18 FM programmes and seven TV stations. Backup power to the tower is 1 MW using two 500 kVA Volvo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brixton, Gauteng
Brixton is a predominantly working class suburb of Johannesburg, South Africa. It is the site of the landmark Sentech Tower, and is near the suburbs of Auckland Park and Melville. History The suburb of Brixton was first surveyed in 1902 from a portion of the farm ''Braamfontein''. The suburb was named after the Brixton suburb in London with many of the area's streets taking their names from districts in the British capital. The ridge on which the area was developed in the early 20th century offers a panoramic view of most surrounding areas of Johannesburg. Brixton consists of wide, neat streets containing some 980 houses, many of which are traditional semi-detached homes with low set walls. Architecture The suburb possesses several distinctive churches, with one having been built by Sir Herbert Baker and Frank Fleming. A few Brixton houses have been declared provincial heritage sites. The area also features one of the largest cemeteries in Johannesburg. Laid out in 1912, B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johannesburg
Johannesburg ( , , ; Zulu language, Zulu and xh, eGoli ), colloquially known as Jozi, Joburg, or "The City of Gold", is the largest city in South Africa, classified as a Megacity#List of megacities, megacity, and is List of urban areas by population, one of the 100 largest urban areas in the world. According to Demographia, the Johannesburg–Pretoria urban area (combined because of strong transport links that make commuting feasible) is the 26th-largest in the world in terms of population, with 14,167,000 inhabitants. It is the provinces of South Africa, provincial capital and largest city of Gauteng, which is the wealthiest province in South Africa. Johannesburg is the seat of the Constitutional Court of South Africa, Constitutional Court, the highest court in South Africa. Most of the major South African companies and banks have their head offices in Johannesburg. The city is located in the mineral-rich Witwatersrand range of hills and is the centre of large-scale gold and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gauteng
Gauteng ( ) is one of the nine provinces of South Africa. The name in Sotho-Tswana languages means 'place of gold'. Situated on the Highveld, Gauteng is the smallest province by land area in South Africa. Although Gauteng accounts for only 1.5% of the country's land area, it is home to more than a quarter of its population (26%). Highly urbanised, the province contains the country's largest city, Johannesburg, which is also one of the largest cities in the world. Gauteng is the wealthiest province in South Africa and is considered as the financial hub of not only South Africa but the entire African continent, mostly concentrated in Johannesburg. It also contains the administrative capital, Pretoria, and other large areas such as Midrand, Vanderbijlpark, Ekurhuleni and the affluent Sandton. Gauteng is the most populous province in South Africa with a population of approximately 16.1 million people according to mid year 2022 estimates. Etymology The name ''Gauteng'' is der ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cantilever
A cantilever is a rigid structural element that extends horizontally and is supported at only one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab. When subjected to a structural load at its far, unsupported end, the cantilever carries the load to the support where it applies a shear stress and a bending moment. Cantilever construction allows overhanging structures without additional support. In bridges, towers, and buildings Cantilevers are widely found in construction, notably in cantilever bridges and balconies (see corbel). In cantilever bridges, the cantilevers are usually built as pairs, with each cantilever used to support one end of a central section. The Forth Bridge in Scotland is an example of a cantilever truss bridge. A cantilever in a traditionally timber framed building is called a jetty or forebay. In t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concrete
Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most widely used building material. Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminum combined. Globally, the ready-mix concrete industry, the largest segment of the concrete market, is projected to exceed $600 billion in revenue by 2025. This widespread use results in a number of environmental impacts. Most notably, the production process for cement produces large volumes of greenhouse gas emissions, leading to net 8% of global emissions. Other environmental concerns include widespread illegal sand mining, impacts on the surrounding environment such as increased surface runoff or urban heat island effect, and potential public health implications from toxic ingredients. Significant research and developmen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shaft (civil Engineering)
In civil engineering a shaft is an underground vertical or inclined passageway. Shafts are often entered through a manhole and closed by a manhole cover. They are constructed for a number of reasons including: * For the construction of a tunnel * For ventilation of a tunnel or underground structure, aka ventilation shaft * As a drop shaft for a sewerage or water tunnel * For access to a tunnel or underground structure, also as an escape route Construction There are a number of methods for the construction of shafts, the most significant being: * The use of sheet piles, diaphragm walls or bored piles to construct a square or rectangular braced shaft * The use of segmental lining installed by underpinning In construction or renovation, underpinning is the process of strengthening the foundation of an existing building or other structure. Underpinning may be necessary for a variety of reasons: * The original foundation isn't strong or stable enoug ... or caisson sunk to for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Television Tower
Radio masts and towers are typically tall structures designed to support antennas for telecommunications and broadcasting, including television. There are two main types: guyed and self-supporting structures. They are among the tallest human-made structures. Masts are often named after the broadcasting organizations that originally built them or currently use them. In the case of a mast radiator or radiating tower, the whole mast or tower is itself the transmitting antenna. Terminology The terms "mast" and "tower" are often used interchangeably. However, in structural engineering terms, a tower is a self-supporting or cantilevered structure, while a mast is held up by stays or guys. Broadcast engineers in the UK use the same terminology. A mast is a ground-based or rooftop structure that supports antennas at a height where they can satisfactorily send or receive radio waves. Typical masts are of steel lattice or tubular steel construction. Masts themselves play no part in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hillbrow Tower
The Hillbrow Tower (formerly JG Strijdom Tower) is a tall tower located in the suburb of Hillbrow in Johannesburg, South Africa. At , it has been the tallest structure and tower in Africa for 50 years, and it was also the tallest structure in the Southern Hemisphere until 1978, when surpassed by the 270 m Mount Isa Chimney in Queensland, Australia. Construction of the tower began in June 1968 and was completed three years later, in April 1971. Construction cost 2 million Rand (at the time, US$2.8 million). The tower was initially known as the JG Strijdom Tower, after JG (Hans) Strijdom, South African Prime Minister from 1954 to 1958. On 31 May 2005 it was renamed the ''Telkom Jo'burg Tower''. The tower was constructed for South African Posts & Telecommunications, which later became Telkom,James Barber, Angela Fung, Sandeep Toshniwal, Becky Voorheis, and Campbell R. HarveyTelkom, South Africa" ''Winter'' (1999). Retrieved 2011/03/17. South Africa's government run an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arup Group Limited
Arup (officially Arup Group Limited) is a British multinational professional services firm headquartered in London which provides design, engineering, architecture, planning, and advisory services across every aspect of the built environment. The firm employs approximately 16,000 staff in over 90 offices across 35 countries around the world. Arup has participated in projects in over 160 countries. Arup was originally established in 1946 by Sir Ove Arup as ''Ove N. Arup Consulting Engineers''. Through its involvement in various high-profile projects, such as the Sydney Opera House, Arup became well known for undertaking complex and challenging projects involving the built environment. In 1970, Arup stepped down from actively leading the company, setting out the principles which have continued to guide Arup's activities since in his 'Key Speech'. The ownership of Arup is structured as a trust. The beneficiaries of the trust are Arup's employees, both past and present, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sentech
Sentech is the signal distributor for the South African broadcasting sector. Background Sentech began operations in 1992 as the signal distributor of the South African Broadcasting Corporation (SABC). Sentech's mandate also included providing services to M-Net, Radio 702, Radio Ciskei, Radio Transkei and the Bophuthatswana Broadcasting Corporation. However, in its Triple Inquiry report that was published in August 1995, the Independent Broadcasting Authority (IBA) recommended that Sentech should be split from the SABC and that Sentech become a public company. This report was approved by the South African Parliament in March 1996 and the Sentech Act to implement these measures was adopted by Parliament in November of the same year. Sentech now operates as a commercial enterprise that is owned by the Government of South Africa via the Department of Communications and has its own board of directors. For a comprehensive list of South African radio and television frequencies, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cantilever
A cantilever is a rigid structural element that extends horizontally and is supported at only one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a cantilever can be formed as a beam, plate, truss, or slab. When subjected to a structural load at its far, unsupported end, the cantilever carries the load to the support where it applies a shear stress and a bending moment. Cantilever construction allows overhanging structures without additional support. In bridges, towers, and buildings Cantilevers are widely found in construction, notably in cantilever bridges and balconies (see corbel). In cantilever bridges, the cantilevers are usually built as pairs, with each cantilever used to support one end of a central section. The Forth Bridge in Scotland is an example of a cantilever truss bridge. A cantilever in a traditionally timber framed building is called a jetty or forebay. In t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reinforced Concrete
Reinforced concrete (RC), also called reinforced cement concrete (RCC) and ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. The reinforcement is usually, though not necessarily, steel bars (rebar) and is usually embedded passively in the concrete before the concrete sets. However, post-tensioning is also employed as a technique to reinforce the concrete. In terms of volume used annually, it is one of the most common engineering materials. In corrosion engineering terms, when designed correctly, the alkalinity of the concrete protects the steel rebar from corrosion. Description Reinforcing schemes are generally designed to resist tensile stresses in particular regions of the concrete that might cause unacceptable cracking and/or structural failure. Modern reinforced concrete can contain varied reinforcing materials made ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
