Pushing installation method for high-pier large-span support-free steel box girder in mountainous area

Abstract

The invention relates to a mountainous area high-pier large-span support-free steel box girder pushing installation method, which is characterized in that two rows of water tanks are respectively arranged on two sides of the top surface of a steel box girder along the longitudinal direction, each row of water tanks comprises a plurality of independent water tanks, and each water tank adopts an independent water injection pipe and an independent water outlet pipe to inject water into the water tank and pump water from the water tank; during pushing, the downwarping amount of the cantilever of the steel box girder is monitored at any time, when the downwarping amount reaches the maximum allowable value, water is injected into the water tank located behind the cantilever, downwarping of the cantilever is counteracted through the balance weight of the water tank, and it is guaranteed that the downwarping amount of the cantilever does not exceed the maximum allowable value. Only the permanent bridge pier is used as a pushing construction platform, a temporary support is not arranged, material input can be reduced, construction efficiency can be improved, and smooth construction and construction safety can be guaranteed.

Description

Technical field [0001] The present invention belongs to the field of bridge construction technology, and it is related to the construction of a top push method to install a steel box beam, which specifically involves a macropolitteling mounting method for a large span-free steel box beam. Background technique [0002] The steel box beam top push installation method is on the bridge head assembling the steel box beam, and the top of the bridgehead steel box beam and the top of each bridge pier are set, and the steel box beam is pushed into the design mounting position along the bridge. For bridges with large spans, in order to avoid top push, the steel box beam creating arms will lead to more than a certain limit. It usually needs to set up a temporary bracket as auxiliary pier across the two bridge pods, and set a jack in the auxiliary pier. Each jack synchronized top push. However, for the mountains across the canyon or river, the stent is generally unable to set up the stent. E...

AI Technical Summary

Problems solved by technology

However, for high-pier bridges in mountainous areas across canyons or rivers, it is generally impossible to erect supports due to the complex terrain; The horizontal force is easy to cause the support to be unstable and affect the safety of construction.

Images