Method for top lifting and heightening frame bridge

Abstract

The invention discloses a lifting and heightening method for frame bridge, which adopts the following construction steps: 1. The wall body of the bridge body is cut and cushioned temporarily; 2. A jack is installed; 3 the bridge body is lifted at stable pressure and slow speed; 4. The steel bars of the wall body of the bridge body are welded and bond, the supported framework is filled with concrete; 5. The bridge top performs waterproof treatment and the joints perform waterproof treatment. In the method, by cutting down the wall body, the bridge top plate and partial wall body are lifted and heightened, after lifted up to the designed standard height, the wall bodies at four sides are welded with main bars and bond with distribution bars and stirrups, and then are filled with concretes to heighten the partial wall body, thereby realizing heightening of frame bridge and reaching current use requirements. In the method, no bridge body needs to be detached during construction, no scaffold needs to be used, no the traffic under the bridge needs to be closed so as to reduce large loss of closing road, save a large amount of engineering cost, and also avoid a large amount of building rubbish generation while generating great economic benefits.

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.