Unbalance-load-free quick dismantling method for multi-span concrete rigid frame arch bridge

Abstract

The invention discloses an unbalance-load-free quick dismantling method for a multi-span concrete rigid frame arch bridge. The method comprises the following steps: erecting an old bridge demolition construction trestle platform, erecting an old bridge arch rib supporting frame, demolishing bridge deck accessories, demolishing bridge deck slabs, demolishing transverse tie beams, demolishing main arch ribs, demolishing bridge piers and demolishing bridge abutment. The unbalance loading of the middle pier is eliminated by erecting the arch rib support frame, the scientific demolition sequence isset, and reasonable dismantling equipment is used, so the defects of secondary cleaning, large construction potential safety hazard, heavy dismounting noise and dust, heavy secondary cleaning pollution and the like after integral collapse by using large-scale mechanical crushing or blasting in a traditional demolition method are overcome, dismounting can be carried out safely, efficiently and environmentally friendly, the green construction concept is met, the purposes of reducing noise, reducing pollution and reducing disturbance to the surrounding environment are achieved, the old bridge dismounting construction technology is enriched, and good reference significance is achieved for similar projects.

Description

technical field [0001] The invention relates to the field of bridge dismantling equipment, in particular to a method for quickly dismantling a multi-span concrete rigid frame arch bridge without partial load. Background technique [0002] Since the 1970s, a large number of multi-span rigid frame arch bridges have been built all over the country. With the passage of time, the traffic volume and vehicle load levels have increased rapidly, and the rigid frame arch bridges built in the early days can no longer meet the needs of modern traffic, and many bridges have cracks in different degrees, damage to transverse connecting beams and other diseases after many years, and the damage is serious. Dismantled and rebuilt. [0003] In the demolition of traditional rigid-frame arch bridge structures, the common demolition methods of rigid-frame arch bridges include mechanical demolition method. Large-scale mechanical guns are mostly used for demolition of bridge decks, chiseling and t...

AI Technical Summary

Problems solved by technology

[0005] 1. The demolition of multi-span rigid frame arch bridges has a "multi-arch effect". When large-scale mechanical demolition is used, the unbalanced thrust on each pier must be strictly controlled during the demolition process. The construction control is strict and cumbersome, which may easily lead to unbalanced forces on the middle pier Overruns lead to instability and collapse of the entire bridge, which poses a high safety risk;

[0006] 2. The vibration load of large-scale mechanical cannons will have uncertain effects and damage on the safety of bridge demolition, which will increase safety risks; blasting construction also has high safety risks;

[0007] 3. Such demolition methods often have a greater impact on the environment, resulting in greater noise, dust, etc.;

[0008] 4. The mechanical crushing method or blasting method causes a large number of broken structures to fall into the river, which will pollute the river, and must be cleaned up and dredged again. It is difficult to clean up the channel waste and the cost of dredging is high;

[0009] 5. The construction has a great impact on navigation, and the suspension time is long

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