Anti-overturning flexible reinforcing structure for single-column pier

Abstract

The invention discloses an anti-overturning flexible reinforcing structure for a single-column pier. The structure comprises a pier, a box girder, an upper anchoring block, a lower anchoring block, prestressed tendon cables and an end anchorage device, wherein the lower anchoring block and the upper anchoring block are anchored to a side surface of a pier and flanges on two sides of the box girderthrough embedded steel bars or anchor bolts correspondingly, prestressed tendon cables penetrate through a pore passage from the upper anchoring block on one side of the box girder, and the prestressed tendon cables penetrate into the lower anchoring block and penetrate out, or penetrate out of the upper anchoring block on the other side of the box girder in the U-shaped turning direction and areanchored, or the prestressed tendon cables on the two sides are anchored to the lower anchoring block, the box girder, the prestressed tendon cables on the two sides and the bridge pier in an X-shaped crossed mode to form an internal self-balancing stress system. The structure is advantaged in that the prestressed tendon cables are effectively utilized, the advantage of high tensile strength of the prestressed tendon cables is brought into full play, anti-overturning flexible reinforcement of the single-column pier bridge is achieved, and a reinforcing component is flexible, small in size, small in influence on an existing structure, small in steel consumption, low in cost, attractive in appearance and high in construction operability.

Description

technical field [0001] The invention relates to a bridge reinforcement structure, in particular to a bridge girder anti-overturning structure reinforced by prestressed tendons and cables, and belongs to the field of civil engineering. Background technique [0002] Since the last century, bridges with single-pillar piers have played an important role in bridge engineering construction due to their beautiful form and small footprint. However, bridges with single-pillar piers have poor lateral stability. Under the influence of factors such as form and temperature, it is extremely prone to overall overturning accidents. Recently, a large number of overturning accidents of single-pillar bridges have occurred, resulting in serious consequences. For example, a single-pillar bridge overturned on National Highway 312 in Wuxi City, Jiangsu Province, causing 3 deaths. Therefore, it is urgent to strengthen the overturning resistance of bridges with single-pillar piers. [0003] At pre...

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Problems solved by technology

For example, the Chinese patent "201820597692.6" discloses an anti-overturning device for a single-pillar pier bridge, including a support plate, a load-bearing plate, a piston, a cylinder, a hydraulic pump, a replenisher, an oil circuit valve, an oil return valve, a support body, a hydraulic device and The support body can provide strong support when the bridge is about to overturn. However, this device involves many components and is difficult to maintain. It is prone to oil leakage and other problems during use, and its reliability is low; another example is the Chinese patent "201820186545.X" Disclosed is an anti-overturning device for the main beam of a single-column pier bridge, which includes cantilever steel beams installed on both sides of the upper part of the single-column pier and prestressed cables connecting the cantilever steel beams to the main beam. When the overturning moment is small, the The prestressed cable and the side cantilever steel girder are used to prevent the main girder from overturning. When the overturning moment is large, the prestressed cable and the steel girder on both sides can jointly prevent the main girder from overturning. However, the addition of the steel girder may invade the clearance at the bottom of the bridge , affecting the passage of higher vehicles under the bridge; another example is the Chinese patent "201721724668.6" which discloses a reinforcement device for anti-overturning and anti-fall beams for single-column piers, including reinforcements arranged on the side walls of single-column piers and box girders lower support

Through the above technical scheme, the single-column pier is reinforced and the box girder is supported, effectively avoiding the overturning of the single-column pier bridge. However, this reinforcement method uses a large amount of steel, which increases the weight of the structure and increases the cost.

[0004] Therefore, the existing anti-overturning reinforcement methods for bridges with single-column piers may involve many components, making construction and maintenance difficult; or affecting the clearance under the bridge, affecting traffic and navigation; or using a large amount of steel, which is costly

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