A composite construction method for the main girder of a cable-stayed bridge and its counterweight structure system

Abstract

The invention provides a combined construction method of a cable-stayed bridge main beam and a counterweight foundation structure system of the construction method. The construction method comprises the following steps: designing a scaffold foundation, designing an excavation slope and step height of a dam at an edge slope region, designing the counterweight structure system of an nth block to a (n+m)th block of a mid-span, excavating the dam, wholly pouring the scaffold foundation and a counterweight foundation, carrying out symmetrical construction on a side-span and the mid-span of a main beam block by block by adopting a construction method for pouring by adopting a symmetrical hanging basket cantilever at two sides, and constructing an nth block to a (n+m)th block of the side-span and the like. The counterweight system provided by the invention comprises the scaffold foundation and the counterweight structure system. A combined construction technology of a main beam front-support-point hanging basket cantilever pouring method and a bracket cast-in-place method is adopted and two technologies are combined together, so that a side-span main beam which cannot meet hanging basket cantilever pouring is constructed; meanwhile, a mid-span main beam and the side-span main beam are symmetrically constructed and a stress state of a cable-stayed bridge is wholly met; a working period is shortened and the construction cost is reduced.

Description

technical field [0001] The invention relates to a construction method of a cable-stayed bridge, in particular to a combined construction method of hanging basket suspension construction and support cast-in-place construction of a cable-stayed bridge and a counterweight system thereof. Background technique [0002] At present, in terms of engineering construction design in the world, when crossing natural landforms such as valleys, rivers, ravines, and sea-crossing bridges, several main bridge forms such as cable-stayed bridges, suspension bridges, and long-span tied arch bridges are adopted. It is the most widely used bridge form in recent years. A cable-stayed bridge is mainly composed of a foundation, a main tower, a main girder, and stay cables. [0003] The construction of concrete main girders of cable-stayed bridges mostly adopts the suspension casting of front fulcrum hanging baskets. It will intersect with the dam of the river, and the external factors cannot be ch...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a cable-stayed bridge main girder combined construction method and its counterweight structure system, to solve the problem that the existing cable-stayed bridge concrete main girder intersects with the river dam and the headroom cannot meet the requirements of hanging basket suspension casting, Technical problems that cannot be realized by the traditional cantilever pouring construction technology on both sides of the main beam

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