Construction method for single-side fusion-through welding of connection angle seams of closed longitudinal ribs and bridge deck slab

Abstract

The invention discloses a construction method for single-side fusion-through welding of connection angle seams of closed longitudinal ribs and a bridge deck slab. The construction method comprises the following construction steps that the multiple closed longitudinal ribs and the bridge deck slab are assembled so that a bridge deck slab unit can be formed, the bridge deck slab unit is installed on a bed-jig of a slab unit welding production line horizontally, and welding backings are installed at the two inside longitudinal angle seams; the longitudinal angle seam located on the outer portion is welded by rotating the bed-jig; the other longitudinal angle seam located on the outer portion is welded by rotating the beg-jig; and the bed-jig is rotated to be in the horizontal state, and the bridge deck slab unit subjected to welding is removed. By means of the construction method, the problems that due to incomplete penetration of one-side welding of closed longitudinal ribs and a bridge deck slab, a fatigue crack source exists, and consequently fatigue cracks are caused can be solved, welding penetration of fillet welds of the closed longitudinal ribs can be effectively prevented, the effect that the depth of fusion of the fillet welds of the closed longitudinal ribs meets the design requirement can be ensured, full penetration and excellent molding of the fillet welds of the closed longitudinal ribs of a steel structure are achieved while the production efficiency is improved, and the service life of the steel structure is prolonged.

Description

technical field [0001] The invention relates to the technical field of steel structure bridge manufacturing. Specifically, the present invention relates to a construction method for single-side penetration welding of corner seams connecting closed longitudinal ribs and bridge decks. More specifically, the present invention relates to a kind of welding applied to the joint joints between closed longitudinal ribs and bridge decks of bridge deck units of orthotropic plate steel bridges, and can also be applied to welding of similar structures. Background technique [0002] The orthotropic steel bridge deck is composed of a deck, longitudinal ribs and transverse ribs, and the three are perpendicular to each other. This structural form has different stiffnesses in the directions perpendicular to each other, resulting in anisotropy in the force behavior. Therefore, it is called orthotropic steel bridge deck. [0003] There are two types of cross-sections for longitudinal ribs of...

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Problems solved by technology

[0006] Still another object of the present invention is to provide a construction method for single-sided penetration welding of the corner joints between closed longitudinal ribs and bridge decks, which can solve the source of fatigue cracks due to incomplete penetration of single-sided welds between closed longitudinal ribs and bridge decks The problems caused by fatigue cracks can not only effectively prevent the weld penetration of closed longitudinal rib fillet welds, but also ensure that the penetration depth of closed longitudinal rib fillet welds meets the design requirements. While improving production efficiency, the closed longitudinal rib fillet welds of steel structures The weld seam is fully penetrated and well formed, which improves the physical properties of the closed longitudinal rib fillet weld of the steel structure and prolongs the service life of the steel structure

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