Abstract：Research purposes: Application of connective pile can solve the difficult problem in exterior-protected construction for underground pipeline and box culvert, ensure the continuity of exterior-protected construction , and avoid the appearance of construction accident caused by seepage.
Research methods: Based on the past experiences, the investigation on geological conditions of the site and the improvement of mechanic equipment , the studies are done on the construction method and the measures for ensuring the construction quality. The practice shows the design and construction of connective pile are successful. The new research direction is put forward to extend the application scope.
Research results : After excavation , the deformation of foundation pit and the error of pipeline are in the permission range only with two leakages.
Research conclusions: This construction technique can solve the difficult problem in underground continuous wall and bored pile constructions in which there are many pipelines，but the deep research should be done on construction technique for the condition of so many deep-buried pipelines.
2007, Vol. 24 
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