Precast-spliced UHPC pipe-concrete super-high pier and construction method thereof

Abstract

The invention relates to a precast-spliced UHPC pipe-concrete super-high pier, comprising a plurality of sections of UHPC pipe precast segments and plain concrete cast in the UHPC hollow pipe precastsegments, wherein the UHPC pipe prefabricated segment is a UHPC hollow pipe body cast by UHPC, a reinforcement hole is reserved in the upper pipe wall of the hollow pipe body, and high-strength steelbars are embedded in the lower pipe wall, and the extension length of the high-strength steel bars matches the depth of the reinforcement hole; the UHPC pipe prefabricated segment is a UHPC hollow pipe body cast by UHPC. The inner side wall of the hollow pipe body is spaced with tooth blocks, and high-strength reinforcing steel mesh is laid between adjacent tooth blocks. The UHPC pipe in the super-high bridge pier makes the ordinary concrete (NSC) in a three-directional compression state, greatly improves the compressive strength of the ordinary concrete (NSC), has good durability and excellent mechanical performance, and also discloses a precast spliced UHPC pipe. The construction method of concrete super-high bridge pier is simple in construction procedure, short in period, lower in equipment investment cost and high in construction efficiency.

Description

technical field [0001] The invention belongs to the field of bridge engineering, and in particular relates to a prefabricated spliced ​​UHPC pipe-concrete superhigh pier and a construction method. Background technique [0002] At present, super-high bridge piers at home and abroad generally have problems such as long construction period, poor construction convenience, excessive investment in erection and climbing formwork, and poor mechanical performance of the pier body. In addition, during the construction of super-high bridge piers, as the height of the pier body increases, the construction period will also become longer accordingly, resulting in increased construction costs and safety risk factors. Especially for municipal bridges, the construction period is too long, which is harmful to the city. Traffic has a great impact, causing inconvenience for residents to travel, and even causing traffic accidents. [0003] Existing super-high bridge piers adopt construction met...

AI Technical Summary

Problems solved by technology

The prefabricated concrete-filled steel tube section in this connection structure needs to be hoisted by a large-tonnage crane. If parallel operations are used in order to speed up the construction period, more investment in mechanical equipment will be added, and the resulting high costs will greatly reduce the economic benefits of super-high bridge piers

[0004] In addition, reinforced concrete super-high piers are prone to be in a state of large eccentric bending and compression stress. When the pier is eccentrically compressed, the pier body is prone to cracks, and the internal stressed steel bars are more likely to corrode when exposed to the external environment, which makes the bearing capacity and durability of the pier Significant decline in sex

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