These three elements form a stabilized primary system.
The membrane units, edged by ridge, valley and cate¬
nary cäbles, are attached to the main mast top ring, the
top of the edge mast, the center ring knots (Fig. 3) and
directly to foundations as secondary elements and stres¬
sed in between those anchor points.
The masts, cylindrical steel pipes of plates up to 30 mm
thickness and with conical end parts center their loads
on hinge bearings, which are provided mainly to cater for
rotation movements during construction. To ease trans¬
port, the main masts got 2 HSFG-bolt splices.