Kilometer-level hybrid beam cable-stayed bridge closure method

Abstract

The invention discloses a closing method for a kilometer-level hybrid beam cable-stayed bridge. The closing method comprises the steps that the pushing direction of main beams on the two sides of thekilometer-level hybrid beam cable-stayed bridge is determined according to the single-side displacement amount; enabling the two-side line shapes of the closure gap to accord with the two-side line shapes of the closure gap in the reference model; after the actual length of the closure opening is equal to the reference length of the closure opening, the closure opening is locked, and pushing is removed; after the closure section beam is hoisted, the unstressed length of the first set inhaul cable is adjusted to a reference value, and the length of the closure section beam is the reference length of a closure opening; calculating a main span steel structure linear relative error, a bridge axis relative error, a tower deviation relative error and a cable force error after the bridge is formed; whether the errors meet corresponding set errors or not is judged, if yes, closure is completed, If not, adjustment is conducted till all the errors meet the corresponding set errors; the relativeerror of the main span steel structure line shape is set to be L/4000, the relative error of the bridge axis is set to be L/40000, the relative error of tower deviation is set to be L/10000, and L isthe main span length.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a method for closing a kilometer-level hybrid girder cable-stayed bridge. Background technique [0002] The unique shape and force characteristics of hybrid girder cable-stayed bridges have been favored by more and more countries in the construction of long-span bridges. Since the 1990s, the bridge type has developed rapidly in my country, from a large span to a kilometer span. With the increase of the span, unprecedented challenges have been brought to the construction of the bridge. [0003] Closure (mid-span steel box girder closure) is one of the important processes in the construction of mixed girder cable-stayed bridges and a key link in system transformation, and its quality will directly affect whether the internal force and alignment of the finished bridge are reasonable. [0004] The traditional method of closing is mostly based on the double control method of cable f...

AI Technical Summary

Problems solved by technology

However, due to the greater influence of temperature, the matching and cutting of the closing section will change the stress-free state of the components, especially for cable-stayed bridges with a kilometer span, the change of the stress-free state of the components will have a great impact on the internal force and alignment of the bridge , thus affecting the quality of the bridge

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