Method for top lifting and heightening frame bridge

Abstract

The invention discloses a method for jacking up and heightening a frame bridge. The construction steps are as follows: 1. Cutting the wall of the bridge body and temporarily supporting pads; 4. Welding and binding of steel bars on the bridge body wall and pouring concrete into formwork; 5. Waterproofing of the bridge roof and joints. The present invention cuts off the wall, lifts the bridge roof and part of the wall, and after jacking up to the design elevation, welds the main reinforcement on the four walls, binds the distributed reinforcement and stirrups, and pours concrete to connect the high part of the wall, thereby realizing the framework. The heightening of the bridge meets the current usage requirements. During the construction period, the present invention does not need to dismantle the bridge body, does not need to set up a full house of red scaffolding, does not close the traffic under the bridge, reduces the huge loss of road closure and detour, and saves a lot of engineering costs. While generating significant economic benefits, it avoids the generation of a large amount of construction waste.

Description

technical field [0001] The invention relates to a frame bridge heightening technology, in particular to a method for jacking up a frame bridge. Background technique [0002] Due to the needs of planning and development, many valuable buildings can no longer meet the current use requirements. According to the traditional design and construction plan, buildings that cannot meet the requirements can only be built and demolished. Many buildings are demolished and then rebuilt, which will waste huge sums of money and a large amount of resources, and a large amount of construction waste after demolition will seriously pollute the environment. How to make use of existing buildings without or less demolition in construction has been highly valued by the state and experts. Therefore, jacking technology, shifting technology, and key reinforcement technology have become the most scientific and advanced methods and research directions for utilizing and protecting buildings. [0003] ...

AI Technical Summary

Problems solved by technology

This construction method for elevating the bridge takes a long time, and the height of the bridge is limited, because concrete is poured on the bridge piers and abutments, and after the bridge piers are heightened, the lateral stability of the bridge piers becomes smaller. After the abutment is heightened, due to the increase of earth pressure, the anti-stability performance of the abutment will become worse; therefore, the pier and abutment cannot be increased too high by this method, and it is generally controlled within one meter

[0004] In addition, the existing bridge jacking and heightening methods are all for single-hole single-piece simply supported beams. Slow, long construction period, heavy cutting workload, small jacking weight

The Chinese patent document disclosed a continuous beam continuous support replacement technology on November 16, 2005. The patent application number is: 200510012605.3. It uses a multi-point synchronous continuous jacking control device to make the entire continuous bridge system in a sufficiently large Synchronous lifting under multi-point jacking force, this jacking technology is suitable for synchronous jacking of continuous beams, but it is only used to replace the support

However, there is no report on the method of jacking and heightening the large-area and heavy-weight slab structure of the frame bridge.