Lattice girder for supporting multiple trays of large-size plate type column

Abstract

The invention relates to a lattice girder for supporting multiple trays of a large-size plate type column. At least one middle parallel chord parallel to the upper parallel chord and the lower parallel chord is arranged between the paratactic upper parallel chord and lower parallel chord of the lattice girder, and the positions of the paratactic middle parallel chords are symmetrical, wherein the upper parallel chord, the lower parallel chord and the middle parallel chords are formed by splicing symmetrical profile steels, and rectangular chord plates are respectively clamped and fixed among the spliced profile steels; both sides of each rectangular chord plate are respectively welded and fixed with a vertical rod and an inclined rod; and the paratactic upper parallel chord, the lower parallel chord and each middle parallel chord respectively and horizontally support a plate type tray. The lattice girder has the outstanding characteristics of large rigidity and small deflection and can achieve the purpose of supporting multiple layers of trays by one girder and also meet the requirement that the levelness of a large-diameter tray is not larger than 3mm. When the lattice girder is applied to a multi-overflow tray, corresponding parallel chords have the effect of reducing liquid pipes, can avoid local vortex interferences to liquid plane propelling flows on odd trays at the parts of the vertical rods and the inclined rods of the traditional lattice girder and also simplify the structural design.

Description

technical field [0001] The invention belongs to a large slab tower, in particular to a truss girder with one girder supporting multiple discs in a large slab tower. Background technique [0002] The plate trays of large plate towers are mainly multi-overflow trays or through-flow trays. With the enlargement of chemical towers, the I-beam supporting main beams of large plate tower trays are gradually replaced by truss beams. [0003] The existing truss girder is mainly composed of parallel upper and lower chords, vertical rods and oblique rods connecting the upper and lower parallel chords, and spacer rods for limiting the distance between the parallel chords. [0004] The structural strength of the above-mentioned truss beams is limited, at most one girder supports two trays, that is, the upper and lower parallel chords of the truss beams support one tray each, and the parallel chords are perpendicular to the downcomers of the overflow trays, resulting in even-numbered trays...

AI Technical Summary

Problems solved by technology

Therefore, the truss girder of the existing large-scale plate tower still has a contradiction between the distance between the tray plates and the height of the parallel chord of the truss girder.

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