Square section type prestress ultra-high performance concrete pipe combined column

Abstract

The invention discloses a square section type prestress ultra-high performance concrete pipe combination column. The column comprises ultra-high performance concrete pipe sections (1) and prestress longitudinal bars (2), wherein the ultra-high performance concrete pipe sections (1) are connected through the prestress longitudinal bars (2), and concrete (3) is poured and filled in the ultra-high performance concrete pipe sections (1). The column is characterized in that the ultra-high-performance concrete pipe sections (1) are hollow pipes which are formed through a centrifugal method and are square outside and round inside, closed stirrups (4) are arranged inside the hollow pipes, through reserved hole channels (5) are formed in the corners in the longitudinal axis direction, and male connectors (6) and female connectors (7) are arranged at the two ends respectively; and the prestress longitudinal bars (2) penetrate through the reserved hole channels (5) of one or more ultra-high performance concrete pipe sections (1), and axial pre-tightening force is applied to the ultra-high performance concrete pipe sections (1) through post-tensioning prestress. The column is suitable for centrifugal production, is convenient for length adjustment, conforms to fabricated construction requirements, has the characteristics of high bearing capacity, favorable durability and the like, and hasfavorable application prospects in fabricated buildings and ocean engineering.

Description

technical field [0001] The invention mainly relates to the field of building structures in civil engineering, in particular to a square segmental prestressed ultra-high-performance concrete pipe composite column that can be used as a structural column. Background technique [0002] Ultra-high performance concrete (UHPC for short) is a new type of cement-based composite material with ultra-high compressive strength, high durability and high toughness. Generally, the compressive strength is above 150MPa, and the flexural strength can reach 30-60MPa, which effectively overcomes the high brittleness of ordinary concrete, has excellent performance, and the mixing process is similar to ordinary concrete, and has a wide application prospect in civil engineering. [0003] As a high-tech concrete, at present, there are two main factors hindering the large-scale application of UHPC: the first is the high cost of a single material. The amount of cement and active admixtures in reactiv...

AI Technical Summary

Problems solved by technology

However, there are some deficiencies in the existing UHPC tube composite columns. First, the UHPC tubes produced by the centrifugation method are all circular tubes, and the formed composite column is a cylinder. However, in practical applications, square columns are more common. The application prospects of the composite columns of circular tubes are obviously limited; moreover, for actual buildings, the length of prefabricated UHPC circular tubes is limited, and they are often disconnected at the floor position. Lateral force (such as earthquake action), the longitudinal reinforcement is disconnected at the end of the prefabricated pipe, and the tensile force of the longitudinal reinforcement caused by the upper lateral force cannot be transmitted downward. Lateral force requires continuous longitudinal reinforcement in the filled concrete poured inside the prefabricated tube. The process of processing and binding the longitudinal reinforcement cage greatly increases the construction difficulty and construction period of the composite column; in addition, subject to production equipment, transportation restrictions and For hoisting requirements, the length of UHPC prefabricated pipes is limited. For some tall buildings or bridges with high piers, the length of a single prefabricated pipe may not meet the design requirements, and its application will also be limited.

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