Abstract: A fiber glass-reinforced plastic mast in the form of several fiber glass-reinforced pipes, which are at a distance from one another and braced relative to one another, the pipes preferably three pipes fixing an equilateral prism, are connected to one another by horizontal laminated panels disposed at different heights.

Abstract: In an apparatus for joining prestressed concrete elements, wherein two prestressed concrete elements to be joined comprise a first prestressed concrete element and a second prestressed concrete element, having a plurality of prestressed first strands within said first prestressed concrete element and a plurality of prestressed second strands within said second prestressed concrete element, a plurality of first strands, after emerging from said first prestressed concrete element, is introduced through openings into said second prestressed concrete element. These first strands introduced into said second prestressed concrete element are then fixed within said second prestressed concrete element under conditions of tensile stress. As a result, the two prestressed concrete elements arranged side by side and to be joined are securely joined together under conditions of predetermined compressive stress.

Abstract: A method for installing a permanent railroad track, for which the concrete railroad ties, carrying the tracks, are lined up positionally in a concrete trough and embedded in a casting compound with embedment in longitudinal reinforcements, in that, to begin with, the tracks with the railroad ties are pre-assembled into a track lattice, which is lined up with the upper edge of the rails and subsequently cast, 2-block concrete railroad ties with two reinforced individual blocks being used, the reinforcement comprising essentially structural steel rods, which run essentially parallel to the axis of the railroad ties, are connected by axially spaced-apart shackles into a reinforcing cage and extend continuously as connecting rods through both individual blocks, at least some protruding beyond the outer end surfaces of the individual blocks and the longitudinal reinforcements, which were previously placed loosely in the concrete trough, being raised and connected with the connecting rods and with the ends of the s