Rail transit three-column type prestressed concrete portal pier and construction method thereof

Abstract

The invention provides a rail transit three-column type prestressed concrete portal pier and a construction method thereof. The rail transit three-column type prestressed concrete portal pier comprisea prestressed bent cap and three pier columns sequentially arranged at intervals in the length direction of the prestressed bent cap, the pier columns are constructed on a pier column foundation, thepier column located in the middle serves as a middle pier column, and the other two pier columns serve as side columns. The middle of the prestressed bent cap is fixedly connected with the top of themiddle pier column, a padstone is constructed at the top of each side column, a support is installed on each padstone, and each end of the prestressed bent cap is supported on the support of the sidecolumn on the corresponding end and is movably connected with the top of the side column on the corresponding end. According to the invention, the supports are reasonably adopted for dynamic connection of the prestressed bent cap and the pier columns, so that the secondary internal force of the structure can be greatly reduced, the structure size and the number of steel bars are optimized, and the purpose of optimal design is achieved. The method is particularly suitable for the three-column type prestressed concrete portal pier structure which is good in foundation condition and short in pier height, and can be popularized to a beam-column type prestressed concrete portal pier structure.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a rail transit three-column prestressed concrete portal pier and a construction method thereof. Background technique [0002] The current portal piers adopt fully rigidly connected portal piers. For fully rigidly connected prestressed concrete portal piers, especially three-column portal piers, due to their high static indeterminate times, when the pier column is short or the foundation When the conditions are good, the self-weight of the rigidly connected structure and the live load of the train will generate structural internal forces, and temperature, shrinkage and creep, settlement and prestressing effects will also produce non-negligible secondary internal forces, which will have serious impact on the design of prestressed cap beams and pier columns. It must be difficult. Compared with the traditional two-column portal pier, the three-column portal pier has a stronger spann...

AI Technical Summary

Problems solved by technology

[0002] The current portal piers adopt fully rigidly connected portal piers. For fully rigidly connected prestressed concrete portal piers, especially three-column portal piers, due to their high static indeterminate times, when the pier column is short or the foundation When the conditions are good, the self-weight of the rigidly connected structure and the live load of the train will generate structural internal forces, and temperature, shrinkage and creep, settlement and prestressing effects will also produce non-negligible secondary internal forces, which will have serious impact on the design of prestressed cap beams and pier columns. It must be difficult. Compared with the traditional two-column portal pier, the three-column portal pier has a stronger spanning ability

Especially when there are two rail transit lines crossing higher-level municipal roads, the two-column portal piers often cannot meet the requirements. Poor effect

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