Combined strengthening structure adopting light-weight aggregate concrete for repairing cracked steel bridge deck

Abstract

The invention discloses a combined strengthening structure adopting light-weight aggregate concrete for repairing a cracked steel bridge deck. According to the technical scheme, the combined strengthening structure is characterized by comprising the fatigue cracked steel bridge deck, shear force connecting pieces, a fiber reinforced composite material layer, reinforcing meshes and a light-weight aggregate concrete layer; the fiber reinforced composite material layer is laid on the cracked part of the fatigue cracked steel bridge deck, the reinforcing meshes are placed on the fatigue cracked steel bridge deck; the shear force connecting pieces are arranged on the fiber reinforced composite material layer; the light-weight aggregate concrete layer is poured on the fatigue cracked steel bridge deck; and the shear force connecting pieces, the fiber reinforced composite material layer and the reinforcing meshes are arranged in a covering manner to be connected with the fatigue cracked steelbridge deck.

Description

technical field [0001] The invention relates to a bridge structure used for reinforcing orthotropic steel bridge decks, in particular to a combined reinforcement structure for solving cracked steel bridge decks by adopting light aggregate concrete. Background technique [0002] As an important structural form of steel bridge decks, orthotropic steel decks have been widely used due to their light weight, high strength, and short construction period. However, with the increase of service time, two types of diseases usually occur on the steel bridge deck: fatigue cracking of the steel structure of the steel bridge deck and damage to the bridge deck pavement, which seriously affect the normal use of the steel bridge. At present, different degrees of fatigue cracks have been observed in bridges with orthotropic steel decks at home and abroad. The main girders or stiffening girders of important bridge structures such as the Humen Bridge that have been built in China all adopt ste...

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Problems solved by technology

[0003] However, there are still many problems in this structure: 1. The original bridge deck has not been reinforced, and the environment of the steel bridge deck is harsh, and the steel bridge deck is in danger of further cracking and corrosion; 2. The steel strips are spot welded to the fatigue-cracked steel bridge The panel, which cannot be closely combined with the original bridge deck, must leave a gap, and cannot bear the same force with the original front panel; 3. The density of steel slats and ultra-high performance concrete is relatively high, because it increases the self-weight of the bridge, Reduced bridge bearing capacity

4. The original bridge deck has been cracked, and short studs are welded again, which brings welding residual stress and new cracks, which further weakens the bearing capacity of the steel bridge deck

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