![]() In several cities in Russia and Ukraine several tubular guyed masts with crossbars running from the mast structure to the guys were built in the 1960s. In Germany, France, UK, Czech Republic, Slovakia, Japan and the Soviet Union, many tubular guyed masts were built, while there are nearly none in Poland or North America. Tubular masts were not built in all countries. In Germany the Bielstein transmitter collapsed in 1985. ![]() In the UK, the Emley Moor and Waltham TV stations masts collapsed in the 1960s. Several tubular guyed masts have collapsed. The big mast of Mühlacker transmitting station is a good example of this.Ī disadvantage of this mast type is that it is much more affected by winds than masts with open bodies. These masts are mainly used for FM-/TV-broadcasting, but sometimes also as mast radiator. This construction type has the advantage that cables and other components can be protected from weather inside the tube and consequently the structure may look cleaner. Guyed masts are sometimes also constructed out of steel tubes. The Crystal Palace tower in London is an example. ![]() When constructed of several sections which taper exponentially with height, in the manner of the Eiffel Tower, the tower is said to be an Eiffelized one. When built as a tower, the structure may be parallel-sided or taper over part or all of its height. Guyed masts are often used the supporting guy lines carry lateral forces such as wind loads, allowing the mast to be very narrow and simply constructed. Lattices of triangular cross-section are most common, and square lattices are also widely used. It provides great strength, low weight and wind resistance, and economy in the use of materials. The steel lattice is the most widespread form of construction. There are over 50 radio structures in the United States that are 600 m (1968.5 ft) or taller. Until August 8, 1991, the Warsaw radio mast was the world's tallest supported structure on land its collapse left the KVLY/KTHI-TV mast as the tallest. Torre de Collserola, a guyed tower with a guyed mast on top where the tower portion is not free-standing.Įxperimental radio broadcasting began in 1905, and commercial radio broke through in the 1920s.Zendstation Smilde, a tall tower with a guyed mast on top with guys which go to ground.The few remaining Blaw-Knox towers do the opposite: they have a guyed lower section surmounted by a freestanding part.The Gerbrandy tower consists of a self-supporting tower with a guyed mast on top.There are a few borderline designs that are partly free-standing and partly guyed, called additionally guyed towers. Towers are more commonly used in cities where land is in short supply. Masts (to use the civil engineering terminology) tend to be cheaper to build but require an extended area surrounding them to accommodate the guy wires. Masts themselves play no part in the transmission of mobile telecommunications. Typical masts are of steel lattice or tubular steel construction. A mast is a ground-based or rooftop structure that supports antennas at a height where they can satisfactorily send or receive radio waves. Broadcast engineers in the UK use the same terminology. However, in structural engineering terms, a tower is a self-supporting or cantilevered structure, while a mast is held up by stays or guys. The terms "mast" and "tower" are often used interchangeably. 5.4.1 Light pollution and nuisance lighting.5.1 Economic and aesthetic considerations.4.5 Telescopic, pump-up and tiltover towers.4 Other types of antenna supports and structures.3.4 Fiberglass and other composite materials.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |