Construction process of main bridge of double-tower single-cable-plane extradosed cable-stayed bridge

Abstract

The invention relates to a construction process of a main bridge of a double-tower single-cable-plane extradosed cable-stayed bridge. The main bridge comprises two main piers and two transition piers.A girder is a whole single-box three-chamber straight web box beam; a main span is arranged in a single-hole two-way navigation manner; the girder adopts a longitudinal, transverse and vertical three-direction prestress system, and is designed according to a full-prestressed concrete member. The sequence of the girder construction process is as follows: No.0 and No.1 beam sections are constructedat the same time; the No.0 beam section is connected with the main pier through a tower beam consolidation system; then, a cantilever symmetrically pours No. 2 to No. 20 beam sections on the side span side and the main span side; meanwhile, a cable bent tower is constructed, inhaul cable supporting facilities are installed, a synchronous suspension pouring beam body and stay cable lagging two sections are installed, a No. 22 beam section located on a transition pier is constructed in due time, then a side span closure section and a middle span closure section are constructed, finally, auxiliary facilities are constructed, and main bridge construction is completed. The construction process is reasonable in step design, short in construction period, safe and reliable in construction and high in quality.

Description

technical field [0001] The invention relates to a construction technique of a main bridge of a cable-stayed bridge with two towers and a single cable plane and a low tower. Background technique [0002] The Pumen Bridge is located about 1km south of the Langshui Village Committee of Pumen Town. The bridge crosses the Hejiang River. It is a 90+165+90m single-cable plane double-tower prestressed concrete low-tower cable-stayed bridge. The low-tower cable-stayed bridge has two main piers and two transitional piers. The main piers use double-leg thin-walled piers and round-end caps , The pile foundation is a 2.2m bored pile. The width of the bridge is 31.0m, the girder height is 3.2m~6.2m, the main tower is a solid cuboid tower with a pagoda-shaped decorative structure on the top of the tower, and the height of the tower is 23.0m. The stay cables are single-cable planes, arranged in a fan shape, and arranged on the central divider in the transverse bridge direction. The stay ...

AI Technical Summary

Problems solved by technology

Difficulty in spatial positioning of stay cables, main girder cable conduits and stay cable anchorage points during construction

[0007] The bridge deck of Pumen Bridge is wide, self-heavy, and difficult to construct. The distribution of steel bars and prestressed pipes is dense, and the structure is complex, making construction difficult.

[0008] During the construction process of the main bridge, the engineering technology is complex, there are many technical difficulties, and the whole process of high-altitude operations above the water makes quality and safety management difficult

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