Construction method for demolition of low pier bridge

Abstract

The invention discloses a construction method for demolition of a low pier bridge. The construction method comprises the following steps that (1) the sequence of the bridge demolition is determined; (2) ground is protected; (3) a support frame is erected; (4) an expansion joint is removed; (5) an anti-collision guardrail and a flange plate are removed; (6) top and bottom plates of a box girder hollow box chamber are removed; (7) an H-shaped structure consisting of a web plate and a pier top cross beam is removed, specifically, a crusher drives under the bridge, the remaining structure of a boxgirder is demolished on both sides of the bridge; the crusher punches out web concrete from the middle section of a span of the box girder to the two sides, the integrity of the web plate is maintained during construction by the own strength of steel bars to prevent sudden breakage during the process of web plate removal, and when punching out of the web concrete reaches to the pier top cross beam, the concrete of the pier top cross beam is removed at the same time; and (8) dust improvement is performed. The demolition of the low pier bridge is reasonable in demolition sequence, low in construction cost, good in economic benefits and high in construction speed, construction safety can be ensured, operation is simple, and wide market promotion value is achieved.

Description

【Technical field】 [0001] The invention belongs to the field of bridge demolition, in particular to a construction method for demolishing low-pier bridges. 【Background technique】 [0002] With the rapid development of the economy, the number of vehicles continues to increase, and with the continuous improvement of various urban infrastructures, more and more bridges built in the early days can no longer meet the needs of modern transportation and should be demolished. [0003] The traditional method of demolishing bridges is to choose the blasting demolition method for bridges in the wild or in open places, and to choose the whole block cutting and lifting method for bridges in urban areas with dense buildings. The whole block cutting and lifting method is to set up a support frame at the corresponding position at the bottom of the bridge, then use a wire saw system to cut the bridge, and then use a large-tonnage truck crane to lift away the box girder sections in sequence. T...

AI Technical Summary

Problems solved by technology

The whole block cutting and lifting method is to set up a support frame at the corresponding position at the bottom of the bridge, then use a wire saw system to cut the bridge, and then use a large-tonnage truck crane to lift away the box girder sections in sequence. This method has low noise and less dust. However, the construction speed is slow and the cost is high. At the same time, due to the heavy weight of the hoisting section, there are great safety hazards in the hoisting process

Moreover, the current bridge demolition methods are all suitable for the demolition of bridges with high piers, and there are few studies on the demolition of bridges with piers lower than 6m, especially the demolition of urban low-pier overpasses.

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