A rapid demolition method without partial load for multi-span concrete rigid frame arch bridge

Abstract

The invention discloses a method for quickly dismantling a multi-span concrete rigid-frame arch bridge without partial load, which includes erecting an old bridge and dismantling a construction trestle platform, erecting an arch rib support frame of an old bridge, dismantling accessories of a bridge deck, dismantling a bridge deck, and dismantling a transverse girder , Main arch rib removal, bridge pier removal and abutment removal, this method of rapid removal of multi-span concrete rigid frame arch bridge without partial load, eliminates unbalanced partial load of intermediate pier by erecting arch rib support frame, sets scientific removal sequence, and is reasonable to use Advanced demolition equipment avoids the disadvantages of traditional demolition methods such as large-scale mechanical crushing or blasting for overall collapse first and then secondary cleaning. The construction safety hazards are large, the demolition noise and dust are heavy, and the secondary cleaning pollution is heavy, making the demolition safe, efficient and environmentally friendly. It is in line with the concept of green construction, and achieves the purpose of reducing noise, reducing pollution, and reducing disturbance to the surrounding environment. It enriches the old bridge demolition construction technology and has good reference significance 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] 2. There is a "consecutive arch effect" in the demolition of multi-span rigid frame arch bridges. When large-scale machinery is used for demolition, it is often necessary to strictly control the unbalanced thrust on each pier during the demolition process. Limits lead to the instability and collapse of the whole bridge, which poses a great safety risk;

[0006] 1. 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] , Such demolition methods often have a greater impact on the environment, resulting in greater noise, dust, etc.;

[0008] 1. The mechanical crushing method or blasting method causes a large number of broken structures to fall into the river, which will cause pollution to the river, and secondary cleaning and dredging must be carried out. The cleaning of channel waste is difficult and the cost of dredging is high;

[0009] , Construction has a great impact on navigation, and the suspension time is long

Images