Concrete placing booms can be extended in different ways depending on the operating conditions. When used outdoors on building sites, the articulated joints and their bearing positions are subjected to harsh conditions. Constant temperature fluctuations, moisture, dirt and chemically aggressive concrete or cement dust all influence the durability of the bearing positions. The booms must always function reliably. The bearing positions must therefore be robust, wear-resistant and always have a high freedom of movement in every boom configuration. Signs of corrosion after longer downtime periods must not lead to the articulated joints becoming stuck. The bearings must slide smoothly to place the concrete exactly, even when subjected to minor swivelling motions. The bearings must not fail prematurely due to abrasive sand or cement particles.

Concrete placing booms can be extended in different ways depending on the operating conditions. When used outdoors on building sites, the articulated joints and their bearing positions are subjected to harsh conditions. Constant temperature fluctuations, moisture, dirt and chemically aggressive concrete or cement dust all influence the durability of the bearing positions. The booms must always function reliably. The bearing positions must therefore be robust, wear-resistant and always have a high freedom of movement in every boom configuration. Signs of corrosion after longer downtime periods must not lead to the articulated joints becoming stuck. The bearings must slide smoothly to place the concrete exactly, even when subjected to minor swivelling motions. The bearings must not fail prematurely due to abrasive sand or cement particles.