旋喷桩在加固地下管线中的应用

Rotary Jet Grouting Piles Applied to Enhancement of Ground Services

介绍了旋喷桩的特点和加固地下管线的机理。通过津汉公路—机场大道立交桥工程中采用旋喷桩加固既有地下管线的设计过程,具体介绍了设计计算中单桩竖向承载力特征值、桩的面积置换率、布桩的计算。工程实践说明旋喷桩加固地下管线地基,对难于拆改的管线起到了保护作用,节约了投资,也为旋喷桩在类似工程中的应用提供了参考。

Introduced hereby are the characte-ristics of rotary jet grouting piles and the mechanism of their enhancement to ground services.With Jin-Han Highway-Airport Boulevard Interchange Project for example,calculation is given of the characteristic value for vertical capacity of a single pile,the pile area replacement ratio and pile arrangement.It is proved by engineering practice that the workmanship can protect the services difficult to be demolished or rebuilt and reduce the cost,and is a good reference for similar works.