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通过对PHC400-A型和PHC500-A型预应力混凝土管桩现场抗拔静载试验和室内足尺寸试验,研究端板、墩头、焊缝及桩身的抗拔性能、破坏形式和薄弱部位。两种试验对比得出上述两种桩型在保证混凝土龄期的情况下,桩身与承台连接安全、桩身结构承载力得到有效发挥时需要2～3m的填芯,并针对天津地质情况指出抗拔静载试验所需要的加载方式。
Through the on-site anti-static static load test and indoor full-scale test of PHC400-A and PHC500-A prestressed concrete pipe piles, the anti-pull performance, failure mode and weak parts of end plate, heading, weld and pile body are studied. . The two kinds of test results show that the two kinds of piles mentioned above can ensure the connection between the pile body and the cap when the concrete age is ensured. When the bearing capacity of the pile body is effectively exerted, it needs 2 ~ 3m core. According to the geological conditions in Tianjin Pointed out that the loading method required for anti-static and static load test.