Construction process of large-span steel tube arch bridge without supports

Abstract

The invention discloses a construction process of a large-span steel tube arch bridge without supports. The constructed large-span steel tube arch bridge is a tied-arch bridge erected on a river channel. A bridge upper structure of the tied-arch bridge comprises arch ribs and tie bars connected between every two arch pins of the arch ribs. Rigid frameworks are arranged in the tie bars. The construction process includes the following steps of firstly, splicing the single-piece arch ribs and the rigid frameworks of the tie rods on the land, wherein arch-shaped steel tube supports of the arch ribs and the rigid frameworks are spliced on a splicing field on a bank side of the river channel; secondly, hoisting the single-piece arch ribs and the rigid frameworks of the tie rods together and placing the arch ribs and the rigid frameworks in place; thirdly, constructing the arch ribs through concrete, wherein the arch pins and end beams are constructed, and concrete is symmetrically pressed and poured for the arch ribs; fourthly, conducting pouring through a tie rod concrete suspended form method; fifthly, installing middle beams. The construction process is simple in process step, reasonable in design, convenient to construct and good in construction effect; the construction process of the large-span steel tube arch bridge without supports can be easily, conveniently and rapidly completed without greatly influencing the navigation of the river channel.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a support-free construction technology of a large-span steel pipe arch bridge. Background technique [0002] The design level of the Shenzhang Line-Zhangjiagang double track channel is Class III, and the navigable hole requirement is (90×7)m. The intersection angle between the newly-built Gongnong Bridge and the center line of the channel is 90°. If the support cast-in-place scheme is adopted for the construction of the new Gongnong Bridge, (2×25)m navigation holes must be set on the approach channel upstream of the lock. The center of the channel is located at the bend of the Sancha River estuary. During the construction of the bridge, it will inevitably affect the navigation of the channel. At the same time, there is a safety hazard of passing ships colliding with the bracket. [0003] The superstructure of the main bridge of the newly built Gongnong Br...

AI Technical Summary

Problems solved by technology

But how to safely and reliably hoist the monolithic arch rib and rigid frame in the long-span steel pipe arch bridge and how to pour the arch rib and tie rod concrete after hoisting, and the construction process will not have a great impact on river navigation , there are few technical materials available for reference

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