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Explanation: From the context you provided, I think it is the following. The central body of a tower is built and then, starting from the bottom, platforms will be added at different heights. The platforms need to be temporarily fixed to the central core in such a way that one can adjust them (for example in a level way) and then fix them (apparently by welding) to the core. The temp. fixings, or better supports, apparently need to leave the platforms free in their rotation (gelenkig gelagert) until the connection with the core is completed. Perhaps this is simply an axis transverally placed with respect to the central core on which the platforms rest before being fixed. In that case they might be called Kopfspindel.
In the absence of a drawing, I would interpret the sentence in this way.
am civil eng.
xxxblomguib Local time: 20:46 Native speaker of: Flemish, Dutch PRO pts in pair: 145