Long cantilever upper pier structure and method for medium and long span steel beam incremental launching construction

Abstract

The long cantilever upper pier structure comprises an upper pier nose bridge, the length of the upper pier nose bridge is 3-5 m, the root section of the nose bridge is the same as the section of the steel beam, the height of the nose bridge gradually changes from the root in a trapezoidal mode, and the root of the nose bridge is connected with a steel beam web in a bolting and welding mode; a jack is arranged on a steel cushion block at the front end of a pier top distribution beam, when the front section of a nose bridge crosses walking type pushing equipment, a first step at the front end of the nose bridge is jacked up to a certain height through the jack on the steel cushion block, a steel cushion block is additionally arranged at the rear end, meanwhile, a supporting stack is cushioned between the nose bridge and the walking type pushing equipment, and the jack falls back; and normal steel beam pushing is conducted in cooperation with a pushing platform at the bridge head and walking type pushing equipment arranged at the pier top, and non-guide-beam and non-temporary-pier pushing construction of the whole long cantilever steel beam is completed. The buckle cable tower is arranged on the steel beam, when a conventional nose bridge pier mounting measure cannot meet the requirement, the front section of the main beam is pulled up through the tower inhaul cable, and smooth pier mounting of the steel beam is guaranteed.

Description

technical field [0001] The invention belongs to the field of bridge superstructure construction, and relates to a long cantilever upper pier structure and a method thereof for the push construction of a medium-long span steel girder. Background technique [0002] The traditional jacking process commonly used in bridge construction is the dragging multi-point continuous jacking method (hereinafter referred to as the dragging method). The dragging method pulls the steel strand by tensioning the continuous jacks set on each temporary pier, and drags the beam section. Slip on the slideway set on the top of the temporary pier, and the traction beam body is installed in place. The drag-type multi-point continuous jacking is the most widely used. This method has mature technology, low construction cost and low requirements on equipment. Walking jacking has certain advantages over traditional dragging jacking. It has higher applicability and safety for beam jacking of some overpass...

AI Technical Summary

Problems solved by technology

When the bridge site is located in a mountainous area with a large terrain height difference, the cost of setting up a high temporary pier in front of the pushing platform is too high. The setting of the steel guide beam will be affected by the tunnel, making it difficult to unload and transport

[0006] For the construction of medium and long span steel girder bridges under the above special conditions, there is still a lack of a jacking method and pier-up technology without guide beams and temporary piers.

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