A construction method of beam first and then pier at the top section of auxiliary pier of cable-stayed bridge

Abstract

The invention discloses a girder-pier sequential construction method of a pier top segment of an auxiliary pier of a cable stayed bridge, and relates to the field of bridge construction. The girder-pier sequential construction method is characterized in that the construction of the pier body of the auxiliary pier is performed twice, and when the pier body of the auxiliary pier is constructed for the first time, a definite height is reserved at the pier top, so that a front fulcrum pull rope cradle can run through the reserved height, after the construction of a main girder of the pier top segment of the auxiliary pier is completed through a cast-in-situ bracket, the cast-in-situ bracket is dismantled, the cradle runs through the auxiliary pier, and during the construction of the part from the pier body of the auxiliary pier to the pier top for the second time, a pedestal is mounted. According to the girder-pier sequential construction method disclosed by the invention, the front segment main girder and the rear segment main girder of the auxiliary pier share one front fulcrum pull rope cradle for construction, human resources and machinery for the dismantlement and the secondary assembly of the front fulcrum pull rope cradle, or human resources and machinery for construction by a bracket construction method are avoided, operation procedures are simplified, the construction period is shortened, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a construction method for the pier top section of an auxiliary pier of a cable-stayed bridge with beam first and then pier. Background technique [0002] The span of the cable-stayed bridge is generally large, often more than 200m, and its main span generally crosses rivers and lakes and other navigable rivers with deep water depth and complicated geological conditions. If the cantilever construction method is not used, but the support construction method, push construction method or swivel construction method is adopted, it will bring greater difficulties to the construction, increase the cost of temporary construction facilities, and even affect the navigation of the river. Cantilever construction methods include cantilever assembly method and cantilever pouring method. Among them, the cantilever assembly method is mainly used for cable-stayed bridges with steel girders, and ...

AI Technical Summary

Problems solved by technology

[0006] 1. The construction process is complicated: the front fulcrum stay cable hanging basket cannot pass through the auxiliary pier normally, and when passing the auxiliary pier top section of the main beam subsequent section, it is necessary to reinstall the front fulcrum stay cable hanging basket, and continue the cantilever construction. Segments, or use the bracket construction method for construction;

[0007] 2. Long construction time: the subsequent sections of the main girder on the top of the auxiliary pier need to re-install temporary facilities such as the front fulcrum dragline hanging basket or bracket, and the process conversion takes a long time;

[0008] 3. The construction cost is high: the utilization rate of the front fulcrum cable hanging basket is low, and additional manpower and machinery are required, which requires a large investment

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