FR2624535A1 - Metal construction device allowing large spans to be crossed - Google Patents

Abstract

The invention concerns a metal construction device allowing large spans to be crossed at low cost in relation to traditional constructions advocated until now. It consists of a triangular three-dimensional master beam 1 which forms the ridge edge of the construction. This beam, bearing on columns 3 and stabilisers 8 positioned in the flank walls, carries the support units 2 for the roof coverings. The units 2 mentioned above are supported on columns 6 positioned on the long sides of the building. Longitudinal stability is ensured by wind bracing along the roof slopes 9, bearing on stability sheeting 10 positioned on the long sides. The device is particularly designed for the construction of industrial, commercial or sports complexes which require an absence of internal obstructions.

Description

 The present invention relates to a construction device allowing the crossing of large spans (36 to 54 m) without intermediate posts, combining architectural beauty at a low cost price having regard to conventional structures hitherto recommended.

 The metal frame consists of a) A three-dimensional central master beam (1) forming an isosceles triangle, composed of an upper chord and two lower chords in a round tube. Three planes of tubular lattice are welded on these members and ensure its rigidity and its great inertia.

This beam rests at the ends of the building in gables on posts (3) in commercial profiles.

The height of the beam (1) varies from 3m to 5.40m depending on the span to be crossed, limited to 54m.

In the case of longer buildings, it is necessary to rest the beam (1) on an intermediate support (5) consisting of a Vvertical composed of two round tubes joining at ground level to form an articulated support (see sketch
PLATE 2/3). This is how this construction principle allowed only one central support in a building with a span of 50 m and a length of 80 m, or 4,000 m2! b) The main support elements of the cover
Two solutions are possible
Roof with 4 sides - isostatic solution (PLATE 1/3 and 3/3)
In this case, the roof is therefore constituted by 4 slopes slope 10 to 14 S located on either side of the beam (1)
A triangle (2) constituting two slopes is made up of cross-sections in commercial profiles and a horizontal frame in round tube taken up by a suspension bar at the ridge also in round tube.

 All the elements are articulated.

 In order to cross the buckling length of the horizontal frame, stability rods in round tubes are placed transversely between the ridge and the low point of the neighboring triangle.

 These isostatic triangles (2) arranged approximately every 6 m, rest in long sections on posts (6) in commercial profiles articulated high and low and in the center on the lower members of the beam (1).

2-slope roof - hyperstatic solution (see PLATE 273)
In this case, the two sides are located on either side of the main beam (1-)
The slopes thus described consist of a cross member (4) in commercial profile connected to a variable inertia shank embedded on the posts (6) located in long sections of the building.

c) The posts
Except in the case of a building longer than 54 m, there is no interior pole. The commercial profile posts are located in long sections (6) and gables of the building (7).

They are intended to take over
- In gables, the forces due to the main beam (1)
- In long sections, the forces due to the support elements of the cover
(2) (4) d) Stability
The transverse stability is ensured by the horizontal trellis of the master beam (1) forming a windward beam and transferring its efforts to vertical stabilities (8) in St Andrew's cross located between the posts (3) supporting the beam (1).

 - The longitudinal stability is ensured by the following side bracing (9) located in the extreme spans of the building and transferring the efforts to vertical stability struts (10) located in the center of each long section and composed of St Andrew's Crosses.

Dimensions
Spans: 5 to 6.50 m
Spans: 30 to 54 m
Height at low point of coverage: 5 to 8 m
Length: 30 to 92 m
Advantages - Very light framework compared to a traditional hyperstatic framework - The triangle of the main beam (1) constitutes the ridge of the building and allows with a translucent cover to provide overhead lighting - All fluids and overhead networks can be integrated into the vacant volume of the main beam (1) - Significant gain on the superficial foundations, only the solid masses taking up the stabilities are relatively large, the others supporting little effort due to the isostatic configuration of the framework .

- The rigidity of the entire structure makes it possible to integrate light handling means.

 Applications - Industrial buildings - Relay factories - Sports halls - Commercial halls - Aviation hangars

Claims (3)

 CLAIMS 1) Metal construction device allowing the crossing of large spans characterized in that it comprises a three-dimensional master beam (1) of triangular shape resting on articulated posts (3) (5), isostatic crosspieces (2) or hyperstatic (4) which come to bear in the central part on the beam (1) and laterally on posts (6). 2) Device according to claim 1 characterized in that the beam (1) consists of tubular sections, 3) Device according to claim 1 characterized in that the beam (1) is capable of crossing a span of 30 to 54 m.