Spiral, lateral and pre-stressing armouring strands are fitted into one half of the mould It is then filled with the exact pre-determined amount of concrete liquid required, before it is mated and locked with the other half.

After the lateral strands have been tensioned the mould is spun horizontally at approximately 500 rpm. The liquid concrete spreads uniformly in the mould, is pressed onto the mould wall and is thereby highly compressed. The centrifugal forces at play in the mould compress the concrete at up to 20 times the force gravity, achieving strengths up to 115N/mm2.

The special compression achieved by the spun concrete process means that the pole reaches 80% of the final strength within approximately twelve hours.

After removal from the mould the pre-tensioning strengths of the strands in the concrete are introduced. Towers with diameters over 2.4 m are produced using the vibration method with a concrete quality of B55, and a maximum section length of 2.5 m In the future towers will be produced up to 7 m in diameter and section length up to 3.8 m.

These sections, cylindrical or conical, are then post-tensioned while being mounted together on-site and thereby achieve excellent stiffness at heights over 100 m.

The use of high-quality concrete, usually B95, together with the spinning process ensures an absolutely smooth pore-free surface and, at the same time, achieves a high degree of stiffness. This enables an ultra-slim design while keeping deflection to a minimum, even at high wind loads. Thus our spun-concrete towers are especially suitable for radio antennae, where strong deflections can significantly affect transmission quality.

The slender design and, where needed, the right colour give the antenna tower an elegant and aesthetic appearance. Its smooth surface has a calming effect and helps the tower fit unobtrusively and harmoniously into any landscape, rural or urban. The surface is as hard as a glass and prevents any moisture penetration, giving corrosion nowhere to start and promising an exceptionally long service life and low maintenance, keeping ownership cost to a minimum.

An antenna tower consists of several prefabricated sections, which are manufactured in our plant and mounted on-site in a few hours to become an operational structure. All the provisions needed for mounting antennae, ladders, cables ducts etc. are pre-installed in each section and your telecommunication carrier system is operational in the shortest possible time.