The object of the invention is an 1-profile preform which comprises an outer wall (1) of the first flange and two inner walls (2) of the first flange arranged with respect to the outer wall (1) of the first flange, a first web wall (3) and a second web wall (4) being arranged in a plane parallel with respect to the first web wall (3), an outer wall (5) of the second flange, and two inner walls (6) of the second flange arranged with respect to the outer wall (5) of the second flange, wherein the corresponding walls (1, 2, 3, 4, 5, 6) are arranged with respect to each other while retaining a gap forming a closed empty inner space of an 1-profile preform, and wherein a valve element (7) is arranged on at least one wall (1, 2, 3, 4, 5, 6). The object of the invention is also an 1-profile manufacturing method with the use of an 1-profile preform.

A decking support system including a plurality of decking support elements, each decking support element including a first decking support engagement feature and a second decking support engagement feature, a plurality of connection elements, each connection element including a first connection feature adapted to co-operate with said first decking support engagement feature of a decking support element, and a second connection feature adapted to co-operate with said second decking support engagement feature of a decking support element, the arrangement being such that a first of said plurality of decking support elements is engageable with a second of said plurality of decking support elements by means of one of said plurality of connection elements dependent on said respective co-operations.

A high-strength grid member is provided that comprises two standard Tee-shaped grid members that are vertically aligned to form an I-beam configuration with the strengthening bulbs of each being spaced apart. A plurality of clips is secured to the spaced-apart bulbs by means of fasteners to secure the two grid members together.

A joist is disclosed. The joist includes a first leg portion, a second leg portion, and a central portion, wherein each of the first leg portion and the second leg portion define a first side, a second side, and a distal side, and one or more stiffeners defined within each of the first side, the second side, and the distal side of the first leg portion and the second leg portion.

A high-strength grid member is provided that comprises two standard Tee-shaped grid members that are vertically aligned to form an I-beam configuration with the strengthening bulbs of each being spaced apart. A plurality of clips is secured to the spaced-apart bulbs by means of fasteners to secure the two grid members together.

A lightweight steel construction includes a plurality of beams and rafters. Each of the beams includes two opposite C-shaped steels. Two ends of the two C-shaped steels are respectively positioned by two first positioning members in a length direction of the C-shaped steels. Several beams can be assembled with each other via the first positioning members to be formed as a crossbeam and a column of a building. Each of the rafters includes a C-shaped steel. Two ends of the C-shaped steel are respectively positioned by two second positioning members in the length direction of the C-shaped steel. Several rafters can be positioned between adjacent beams via the second positioned members to be formed as a floor surface, a wall surface, and a roof of the supporting frame of the building.

A hollow profile (1, 15), in particular crane girder for a crane (14), wherein the hollow profile (1, 15) has a cavity (2) and an outer wall (3) bounding the cavity (2), and at least one fastening element (4) protruding from the outer wall (3) for the, preferably re-releasable, fastening of at least one add-on part (5) to the hollow profile (1, 15), wherein the outer wall (3) has at least one passage opening (6), which opens into the cavity (2), for the fastening element (4), and an intermediate space between that portion (36) of the outer wall (3) which bounds the passage opening (6) and the fastening element (4) which is guided through the passage opening (6) is sealed with a sealing compound (7).

A joist is disclosed. The joist includes a first leg portion, a second leg portion, and a central portion, wherein each of the first leg portion and the second leg portion define a first side, a second side, and a distal side, and one or more stiffeners defined within each of the first side, the second side, and the distal side of the first leg portion and the second leg portion.

This publication relates to a tubular transom in particular for temporary structures, such as scaffolding or false work and similar structure, having ends configured to be connected to verticals at node sections arranged at intervals on the verticals. Each end of the transom comprises a fastening device with an integrated profile part, releasably attached to the tubular transom in an opening at the ends of the tubular transom. The transom comprises a first and at least second elongate, parallel and hollow tube elements, interconnected at least at each end by intermediate integrated web plates, rigidly fixed to said at least two tube elements. A contact surface of the opening in the first tube, is transversally arranged relative to one or more web plates. A contact surface of the opening in the second tube is transversally arranged relative to one or more web plates. The opening at the ends of the transom having at least partly a complimentary shape.