Ecological demolition system and construction method of cast-in-place box girder with piers retained

Abstract

The invention discloses an ecological demolition system and construction method of a cast-in-place box girder retaining pier columns. Side-span direct lifting section, side-span mechanical removal section, mid-span direct lifting section, mid-span mechanical removal section, slide, mobile trolley, foldable double-stretch telescopic disc, flange plate, upper telescopic slide plate, lower telescopic slide plate, Box girder top plate, box girder bottom plate, box girder web, high-strength steel cable, easy-to-detachable annular steel hoop, stressed high-strength steel plate, high-strength locking bolts, the method of the present invention adopts mechanical breaking of the box girder far away from the pier column, and the anti-collision The guardrail is dismantled with a movable foldable double-stretch telescopic plate combined with a slide; the box girder close to the pier column is lifted directly by a truck crane, and the steel pipe pile pier column reinforcement system with adjustable elevation is used to protect and strengthen the retained pier column. The pier column cover beam adopts easy-to-detachable ring-shaped steel hoops and high-strength steel cables to prevent eccentric tension damage when the box girder is removed.

Description

technical field [0001] The invention relates to the field of box girder demolition engineering, in particular to an ecological demolition system and construction method of a cast-in-place box girder with piers retained. Background technique [0002] Affected by multiple factors such as theoretical defects, construction technology, construction level, and building materials, a large number of concrete box structures after completion generally have cracks in the top plate, bottom plate, and web plate, decreased prestressing strength, and mid-span deflection. Affect the durability and beauty of the structure. In severe cases, it has restricted the normal use of the bridge or even caused the structure to lose its bearing capacity. Some bridges need to be repaired and reinforced, while some bridges cannot be reinforced or have no reinforcement value and have to be demolished. In the construction of bridge upgrading, reconstruction and expansion, it often involves the demolition o...

AI Technical Summary

Problems solved by technology

[0003] During the traditional box girder dismantling construction process, there are often the following problems: (1) when the anti-collision barrier is broken, the whole piece falls, the risk factor is high, the anti-collision barrier cannot be reused, and resources are wasted seriously; (2) when the box girder is broken, It has a great impact on the pier columns that need to be retained, and the pier columns are easily damaged by the broken block of the box girder; (3) When the box girder is broken at the side span, the cover beam of the side span pier column is prone to eccentric tension damage, which affects the normal sequence of the pier column (4) The entire section of the box girder is demolished mechanically, which has high construction strength, low efficiency, large environmental pollution and high noise

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