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The lookout tower on top of the Velký Kamýk hill is a combination
of a technology tower carying the antennas of mobile phone operators and a public lookout tower. The Investor required a tower 65 m high for heavy antennas of overalI wind-exposed area of some 100 m2. During the review of the project by the District Office in Písek
the Department of Regional Development and the Department
of Environment raised the requirement of erection of a tubular mast with a lookout platform. Its architectural design was approved
by the Chief Architect of Písek. Another criterion important for the Investor was the costs which should not exceed much
the construction costs of a standard lattice tower. Structurally new was the combination of the central tube with four corner members
the buckling length of which is assured by pairs of horizontal members spaced at 6 m. The shear forces are transmitted by the central tube replacing the lattice structure of the tower.
The central tube of 1680 mm diameter at the foot and 1200 mm
at the top consists of preassembled parts jointed by means of inner flanges. The dia. 219 mm corner members are constrained in
the central tube 45 m above ground level. The flanged jointing
of corner members use high-strength friction-grip bolts like the flanges of the central tube. The surface is provided with hot-dip galvanizing combined with a finishing paint coat.
The circular lookout platform 30 m above ground level is accessible
by a helical staircase, the technological platforms by a ladder provided with a safety strip. Technological cables proceed to individual platforms inside the central tube provided with an internal ladder.