预制T梁预应力施工缺陷与孔道压浆质量控制

Defects in Prestressing Construction of Prefabricated T-beams and Quality Control of Duct Grouting

摘要:

预制T梁是公路桥梁工程较为常用的上部结构形式,预应力张拉与孔道压浆作为决定梁体承载能力和耐久性能的关键工序,一旦出现施工缺陷,将极易引发梁体下挠、钢绞线锈蚀等长期病害。文章系统梳理预制T梁预应力施工各阶段的典型缺陷类型及其形成机理,并从浆体配合比优化、智能工艺应用、无损检测创新、全流程管控四个维度提出孔道压浆质量精细化控制方案,明确各项关键技术参数与管控要点,以期为同类工程预应力施工质量提升提供技术参考。

Abstract:

Prefabricated T-beams are a commonly used form of upper structure in highway bridge engineering. Prestressing and grouting of ducts are key processes that determine the bearing capacity and durability of the beam. Once construction defects occur, they can easily cause long-term diseases such as deflection of the beam and corrosion of steel strands. The article systematically sorts out the typical defect types and their formation mechanisms in each stage of precast T-beam prestressed construction, and proposes a refined control plan for the quality of duct grouting from four dimensions: slurry mix optimization, intelligent process application, non-destructive testing innovation, and full process control. It clarifies the key technical parameters and control points, in order to provide technical reference for improving the quality of prestressed construction in similar projects.