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北方某预制梁场,在临近冬季降温期,采用传统压浆方案施工的几片梁因压浆不实和孔道积水,受低温冻胀影响导致梁体腹板出现裂纹。经多种方法检测和补强后继续投入使用。在后续梁片生产中,改用真空压浆方案,通过降低水灰比和二次补压等措施,解决了低温寒冷地区压浆不实等质量问题,为寒冷地区预应力施工提供了参考和借鉴。
In a prefabricated beam field in the north, near the cooling period in winter, a few beams constructed by the traditional grouting scheme are not grouted and water accumulated in the channels, and cracks occur on the webs of the beam body under the influence of low-temperature frost heave. After a variety of ways to detect and enhance continue to put into use. In the follow-up beam production, the vacuum grouting scheme was switched to, and the quality problems such as false grouting were solved by reducing the water-cement ratio and the secondary compaction, which provided a reference for the prestressed construction in cold regions Learn from