 torre de collserola () is a uniquely designed tower located on the tibidabo hill in the serra de collserola, in barcelona, catalonia, spain. it was designed by architect sir norman foster and by spanish civil engineers julio martÃ­nez calzÃ³n and manuel juliÃ  vilardell, and built in 1991 by construction company cubiertas y mzov s.a. for the 1992 summer olympics. it features a pod for floor space like many towers but uses guy wires for lateral support like a mast. mainly used as a tv and radio transmitter, this futuristic design provides the highest viewpoint over the city. the top antenna reaches 288.4&nbsp;m (946&nbsp;ft) and the top of the pod, which has thirteen floors, reaches 152&nbsp;m (499&nbsp;ft). the tenth floor of the pod is open to the public. == construction == the tower has a hollow slip-formed, reinforced concrete main shaft of only 4.5&nbsp;m diameter, which reduces to a mere 3&nbsp;m to hold a radio mast which telescopes from 2.7&nbsp;m to 0.7&nbsp;m. the thirteen floors are surrounded by a perimeter of open stainless steel grilles and suspended from the shaft by three primary vertical steel trusses. the total weight of the tower is 3,000 tons. a large number of cables keep the tower upright: *the lower guys are composed three series of 180 parallel strand cables (15&nbsp;mm diameter) made from pre-tensioned high-strength steel with a polyethylene covering, each; *the upper guys are made of three series of 7 aramid fibre cables in parallel (56&nbsp;mm diameter), each terminated with a resin socket.torre de collserola the three upper cables have a combined breaking strength of 4,200 tons. == see also == * list of towers == references ==   * torre de collserola * foster and partners  *  * torre de collserola at factorÃ­a urbana: photos and technical information about the tower * torre de collserola: connecting barcelona *
Buildings_and_structures_in_Barcelona Communication_towers_in_Spain Modernist_architecture_in_Barcelona Norman_Foster_buildings SarriA -Sant_Gervasi Towers_in_Catalonia