Masonry arch bridge rapid forcible entry method capable of releasing bridge deck constraint

Abstract

The invention discloses a quick break-in method for a masonry arch bridge capable of releasing bridge deck constraints. The quick break-in method comprises the steps that firstly, structural parameters of the masonry arch bridge to be broken in a measured mode are collected or actually measured; 2, calculating critical values of the number, the thickness and the width of the steel bars paved on the bridge deck through a critical equation; thirdly, the to-be-broken masonry arch bridge deck is cut, and the number, the thickness and the width of steel bars laid on the to-be-broken masonry arch bridge deck are all smaller than the critical value; fourthly, a long-arm hook machine is adopted for breaking and dismantling an arch foot on one side of the masonry arch bridge, and the bridge span of the masonry arch bridge can collapse in the whole span; and fifthly, the collapsed and fallen masonry materials are cleared and transported, and masonry arch bridge forcible entry operation is completed. According to the method, the whole-span collapse can be realized, the masonry material is crushed into small blocks by utilizing the falling energy of the whole-span collapse, the quick breaking and removing and clearing are realized, the breaking and removing safety risk is reduced, the construction period is shortened to the greatest extent, the construction cost is reduced, and the interference and influence on the surrounding environment are reduced.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and particularly relates to a rapid and one-time dismantling method for a masonry arch bridge for releasing the restraint of a bridge deck. Background technique [0002] In the history of our country, many bridges were built mainly using masonry work such as brick, stone and concrete as the main construction materials, especially the masonry arch bridges, such as the Zhaozhou Bridge built in the Sui Dynasty and the modern double-curved arch bridge. The masonry arch bridge makes full use of the compressive capacity of the masonry materials, without or with less reinforcement, to meet the production and living needs of crossing rivers and valleys in a special historical period. In the past 20 years, with the great development of the national economy and transportation infrastructure, the traffic flow has increased year by year, and the load level has gradually increased. Due to its own...

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Problems solved by technology

[0006] However, because some masonry arch bridges have re-deck pavement or other maintenance and reinforcement, the steel content is relatively large, and the progress of conventional mechanical demolition is slow, the workload is large, and the cost is high; Masonry arch bridges often fail to collapse and fall over the entire span, and the remaining part of the bridge body is suspended in the air, so that the suspended part of the bridge body needs to be dismantled at high altitude mechanically, resulting in high safety risks, extended construction period, and increased cost. Demolition failure, to solve these drawbacks, the field of bridge engineering construction technology urgently needs a fast, low-cost, and equal-risk demolition method for masonry arch bridges

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