Construction method for large-span continuous beam UHPC columns

Abstract

The invention discloses a construction method for large-span continuous beam UHPC columns. The construction method comprises the following steps: (1) prefabricating segments of UHPC columns; (2) installing 0# segments of the segments of UHPC columns on a main pier bracket, pouring normal concrete, tensioning prestressing tendons, and assembling a hanging basket; (3) installing 1# segments of the segments of UHPC columns on a template of the hanging basket, positioning the 1# segments of the segments of UHPC columns through U-shaped positioning steel plates of the 0# segments of the segments ofUHPC columns, and forming rhombus-shaped pouring cavities from opposite cast-in-situ joint surface structures and the U-shaped positioning steel plates; (4) casting RPC inside the rhombus-shaped pouring cavities in situ, then casting normal concrete in the 1# segments, tensioning the prestressing tendons, and moving and assembling the hanging basket; (5) constructing other concrete segments designed with the UHPC columns; and (6) constructing other normal prestressed concrete segments and closure sections so as to complete construction. The construction method is smart in structure, convenient in operation and convenient to implement, secondary modeling disturbance is reduced, effective combination of UHPC prefabricated columns and post-cast joints is guaranteed, and the problem, that thedeformation is increased continuously caused by concrete shrinkage and creep, of the large-span prestressed concrete continuous beam structure is solved.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a construction method for a long-span continuous beam UHPC column. Background technique [0002] During the operation of long-span continuous beams (continuous rigid frames), the mid-span deflection continues to increase due to the shrinkage and creep of concrete, which is a common problem in bridge engineering. UHPC (Ultra-High Performance Concrete) is an ultra-high performance concrete material, which has ultra-high compressive strength, flexural strength, and toughness. Compared with ordinary concrete, active powder is added in the preparation process of UHPC. It shows the characteristics of extremely low shrinkage performance and small creep coefficient. Based on this feature, the researchers envisioned setting UHPC columns in the compression area of ​​the continuous beam in order to solve the problem of continuous growth of deformation of the long-span prestress...

AI Technical Summary

Problems solved by technology

Based on this feature, the researchers envisioned setting UHPC columns in the compression area of ​​the continuous beam in order to solve the problem of continuous growth of deformation of the long-span prestressed concrete continuous beam structure due to shrinkage and creep.

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