Large-truss-height adjustable suspended splicing combined type frame steel arch frame and large-span arch ring integral pouring process

Abstract

The invention provides a large-truss-height adjustable suspended splicing combined type frame steel arch frame and an integrated large-span arch ring integral pouring process, the steel arch frame comprises an arch foot section, a standard section, an adjusting section, a closing section and a closing device which are sequentially connected in the arch arc line direction, and a plurality of sections arranged side by side in the arch width direction form an arch rib; the adjacent arch ribs are transversely connected through horizontal connecting pieces and vertical connecting pieces, the upper layer truss, the lower layer truss and the vertical frame are jointly spliced to form the overall stress type arch frame, and the connecting portion of the upper layer truss and the lower layer truss is located at the arc line of the middle of the arch. The process comprises the following steps: loading steel arch frame sections in a stacking manner, transporting the steel arch frame sections to a construction site, constructing arch foot sections, constructing standard sections, adjusting the sections, folding the sections, folding the steel arch frames, supporting an arch mold, and carrying out integral cast-in-place construction. The large-span steel arch has the advantages of being good in overall stability, uniform in stress, high in strength, adjustable in span, adjustable in arc, adjustable in breadth and the like, and the problems of transportation and construction of the large-span steel arch are solved.

Description

technical field [0001] The invention belongs to the technical field of construction of the main arch ring of an arch bridge, and in particular relates to an integral pouring process of a large truss height-adjustable suspension combined frame steel arch frame and an integrated large-span arch ring. Background technique [0002] The steel arch frame usually refers to the special support for construction measures used in the construction of the cast-in-place reinforced concrete main arch ring. system, longitudinal connection device) and standardized single structural parts, which are assembled at the construction site according to a certain combination method to form a special arch device that meets the project conditions, which is called a combined steel arch. Suspension assembly refers to the hoisting and installation process that transports the corresponding matching number of standardized single structural parts to the construction site and assembles them according to the ...

AI Technical Summary

Problems solved by technology

If it is necessary to apply the steel arch frame to the construction of the main arch ring with a large span (200-300 meters), there are three main technical routes: one is to stack multiple arch frames along the height direction to form an arch similar to the pancake type Structures (such as upper and lower two-story arches or upper, middle and lower three-story steel arches), adjacent arches are connected together. However, the biggest disadvantage of this pie-shaped arch structure is poor stability and many weak areas. Therefore, it has not been practically popularized and applied; the second is to thicken and heighten each section of the steel arch (such as the section of the steel arch with a span of 260 meters needs to be heightened to five meters or even higher). However, many roads have The height limit for driving and the construction of arch bridges are usually located in mountainous canyons or river valleys with rugged roads, which will inevitably bring huge difficulties to the transportation and construction of steel arch segments; Suspended cast section by section in the hanging basket, however, this process has very high requirements on the strength and rigidity of the anchor device and its infrastructure, especially the anchor device needs to bear the load of multiple cantilevered sections, it is used for large-span The construction of the main arch ring of the diameter also needs to be equipped with large-scale construction equipment. The construction process, especially the shifting process of the hanging basket, is very cumbersome and must be managed on both sides of the steel arch frame. There are problems such as high construction cost and long construction period.

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