厚软土覆盖层桩基施工溜桩处置措施

溜桩在码头预制桩沉桩施工时经常发生，特别是覆盖层较厚时更为明显，此时不能简单采用降低桩身自重或降低桩锤自重等常规措施来解决问题。结合工程实例，对溜桩产生的机理进行详细分析，创新地采用增设桩锤吊笼的溜桩沉桩改进措施，并对沉桩质量进行检测。结果表明，厚软土覆盖层桩基施工发生溜桩时采用改进型桩锤吊笼设施后，桩身完好，桩尖达到设计高程，桩基竖向承载力满足设计要求，沉桩质量可以得到有效保障，其措施是可行的。

Controlling measure for rapid pile sinking during pile foundation construction at thick soft soil layer overburden

The rapid pile sinking is a common event during the pile foundation construction, especially at the thick soft soil layer overburden.The problem cannot be solved by the conventional measures such as reducing the weight of pile shaft or the weight of hammer.Combining with the engineering example, we analyze the production mechanism of the rapid pile sinking, innovatively adopt the improvement measure of the pile driver hammer cage, and test the pile sinking quality.The results show that the improved pile driver hammer cage is used when the rapid sinking occurs during the pile foundation construction at thick soft soil layer overburden, the pile is intact, the pile tip can reach the design elevation, bearing capacity of pile can satisfy the design requirements and the quality of pile driving can be guaranteed.The measure is useful.