Construction method of newly added pier columns bearing steel truss girders to strengthen bridges spanning existing lines

Abstract

The invention relates to a construction method for newly added piers bearing steel truss girders to reinforce bridges spanning existing lines, comprising steps: step 1: constructing an under-bridge supporting system at the bottom of the bridge; Pavement, bridge deck and railings; Step 3: Install the prestressed jacking system under the bridge; Step 4: Push out the concrete longitudinal beams on both sides of the bridge through the prestressed jacking system and remove them; Step 5 : push the lower chord of the steel longitudinal beam to the designated position through the jacking system, weld the upper chord and the lower chord at the same time, and weld the steel longitudinal beam of the adjacent segment; Step 6: vertically erect the steel longitudinal beam To jack up; Step 7: Carry out structural restoration on the bridge deck, and dismantle the jacking system. The beneficial effects of the present invention are: the present invention adopts the steel longitudinal beam jacking system for construction, and the construction operation is mainly carried out under the bridge without occupying the space of the bridge deck, thereby reducing the impact on traffic.

Description

technical field [0001] The invention relates to the technical field of bridge reinforcement and transformation construction, in particular to a construction method for reinforcing a bridge spanning an existing line with newly added pier columns bearing steel truss girders. Background technique [0002] With the rapid development of my country's economy, society and transportation, expressways are rapidly extending to areas with complex terrain and geological conditions, bridges account for an increasing proportion of the total length of the route, and bridges are increasingly bearing more frequent and heavy loads than expected in the design. The load of traffic vehicles also puts forward higher requirements on the traffic capacity of existing bridges. After some bridges have been put into operation for several years, there are more or less potential safety hazards due to problems such as heavy traffic and overweight loads. Therefore, the reinforcement of old dangerous bridges...

AI Technical Summary

Problems solved by technology

[0003] After investigation and research, it is found that in most of the old dangerous basket arch bridges, there are problems such as uneven stress on the suspender structure and insufficient safety factor of some suspenders, and the cracks and damage of the corbels on the beams are serious and the cracks have obvious development. There are cracks in the joints, which may easily lead to a large deviation between the actual operating state and the theoretical state of the bridge suspender cable force

In the current status of the bridge, the anti-aging fatigue ability of the suspender material and the level of construction technology are difficult to fundamentally solve the problems of water accumulation in the anchor head protective cover of the old dangerous basket arch bridge, anchor head corrosion and suspender cable force loss.

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