Large-cantilever prestressed-cover-beam support device and construction method

Abstract

The invention provides a large-cantilever prestressed-cover-beam support device and a construction method, and relates to a road-bridge cover-beam construction device. The problem that in the prior art, a large-cantilever cover-beam supporting system influences the road traffic under a bridge is solved. The large-cantilever prestressed-cover-beam support device comprises middle supporting columnssupported at the root of a cover-beam cantilever, the middle supporting columns are symmetrically arranged on the two sides of a cover-beam pier, and the bottoms of the middle supporting columns are supported on a bearing platform where the cover-beam pier is located. The large-cantilever prestressed-cover-beam support device further comprises end supporting columns supported at the end of the cover-beam cantilever, the bottoms of the end supporting columns are supported on the ground through reinforced concrete, a bearing beam is supported at the upper ends of the middle supporting columns and the upper ends of the end supporting columns, a slope-adjusting truss beam is supported on the bearing beam, and a cover-beam bottom die is supported on the slope-adjusting truss beam. By designinga gate pier type assembly type steel pipe supporting column support system, the contradiction between normal passing on a ground road and cast-in-place construction of the cantilever cover beam is well solved, and the steel consumption of a temporary structure is small.

Description

technical field [0001] The invention belongs to the technical field of building construction, and relates to a construction device for road bridge cover beams, in particular to a road bridge cover beam support device. Background technique [0002] With the continuous development of urban viaduct construction, large cantilever prestressed concrete cap beams have been widely used due to their advantages such as small footprint, light structure, beautiful appearance, good traffic sightlines and full use of urban road space. In order to alleviate the increasingly tense traffic pressure, urban roads and viaducts have been built wider and wider. The total length of the cover beams has exceeded 35m, and the length of the cantilever on one side has gradually reached more than 10m. In order to minimize the impact on road traffic under the bridge, higher requirements are put forward for the construction of large cantilever cap beams. [0003] According to the existing engineering pra...

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Problems solved by technology

[0003] According to the existing engineering practice, the large cantilever cover beam mainly uses the support form of the steel pipe support column plus the Bailey frame, or the steel pipe support column plus the cantilever truss type support system or the corbel bracket plus the Bailey frame and other forms, and its advantages are as follows: Make full use of the cap to set up steel pipe support columns for support erection, the construction process will not affect the normal driving of vehicles within the projection range of the cover beam, and the amount of steel used for the temporary structure is relatively small, and the construction is convenient; the disadvantage is that the support system is limited by the cantilever length of the cover beam When the cantilever length exceeds 8m, the deformation of the cantilever Bailey frame support or truss on the steel pipe column or bracket will be large, which will affect the pouring quality of the cover beam

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