Large-span steel truss arch construction method

Abstract

The invention relates to a large-span steel truss arch construction method. The invention is characterized in that the method comprises the following steps: 1) based on the alignment design of an main arch ring of a reinforced concrete arch bridge, if a main arch span of the reinforced concrete arch bridge is not more than 100m, an arc line is adopted as the line shape of a arch axis line of the steel truss arch; if the main arch span of the reinforced concrete arch bridge is more than 100m, a catenary line or a parabola curve is adopted as the line shape of the arch axis line of the steel truss arch; big samples of a first unit truss segment and a second unit truss segment are produced for steel truss arch ribs on a sample platform according to the scale of 1:1; 2) the inner side of a first main arch support is widened to form a first base of the steel truss arch, the inner side of a second main arch support is widened to form a second base of the steel truss arch; 3) the erection sequence of the unit truss segments is that: first arranging steel truss arch ribs on the upper course of a river, then arranging steel truss arch ribs in sequence to the lower course of the river; 4) the back arch elevation of the steel truss arch is adjusted to the level of the arch soffit elevation of the main arc ring. The construction method is not limited by the terrain condition and site condition of bridge location and is simple and easy to install and remove.

Description

technical field [0001] The invention belongs to the technical field of reinforced concrete arch bridge construction, in particular to a construction method of a steel truss arch, which is suitable for the construction of a large-span reinforced concrete box arch bridge. Background technique [0002] To build a long-span reinforced concrete arch bridge (the long-span refers to a span ≥ 40m) under specific circumstances, it is necessary to construct the main arch ring construction support. For example, in a deep mountain canyon, where the prefabricated hoisting construction is not possible due to the narrow construction site, and when the conditions under the bridge span are not allowed and the scaffolding-filled arch frame cannot be erected, it is necessary to consider the use of steel truss arch frame for arch ring construction. [0003] The steel truss arch frame is a steel truss arch rib arch frame that is assembled and combined with a certain length of truss segments made...

AI Technical Summary

Problems solved by technology

However, the general universal components cannot be directly assembled into an arch truss, and the joints and connections must be specially processed and modified according to construction requirements before they can be assembled into an arch truss.

In addition, because the cross-sectional form, component size and joint structure of general universal components are relatively fixed and single, using it to arrange structural arches will be greatly restricted, and the construction will be purchased or leased and then refined and transformed into arches. more expensive

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