Construction method of covering type anti-drag precast pile: Fid-Bau Portal

Construction method of covering type anti-drag precast pile

ZHU QINGKAI / SONG WEIJIE / LI JIANPING / FENG ZHENTONG / LIU GUANGLEI / WU SIYU

The invention discloses a construction method of a covering type anti-drag precast pile, and belongs to the technical field of pile foundation construction. The covering type anti-drag precast pile comprises a precast pile, a composite film and a fixing piece; the composite film is of a three-layer structure, the outer layer film is provided with fibrous fluff, the outer layer film is bonded with the buffering and resistance reducing layer, the inner layer film is partially bonded with the buffering and resistance reducing layer, the space between the inner layer film and the outer layer film and the interior of the buffering and resistance reducing layer are filled with a resistance reducing agent, the composite film is fixed to the lower end of the prefabricated pile through the fixing piece, and the inner layer film is in frictional contact with the prefabricated pile. The construction method comprises the following steps: cleaning the precast pile; preparing a composite membrane; performing hole forming operation; precast pile construction; and finishing the construction. The surface of the precast pile is covered with the composite film, so that the influence of settlement on the pile foundation in the construction process of a soft soil area or a soil filling area and after construction is eliminated.

本发明公开了一种覆盖式减阻预制桩的施工方法，属于桩基施工技术领域，包括预制桩、复合膜、固定件；复合膜为三层结构，外层膜有纤维状绒毛，外层膜与缓冲减阻层粘结，内层膜与缓冲减阻层部分粘结，内层膜和外层膜之间的空间包括缓冲减阻层内部均填充减阻剂，固定件将复合膜固定在预制桩下端，内层膜与预制桩之间摩擦接触。施工时按照如下方法操作：预制桩清理；复合膜准备；成孔作业；预制桩施工；施工完成。本发明通过在预制桩表面覆盖复合膜进而达到消除软土地区或者填土地区施工过程中及工后沉降对桩基础影响的问题。

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