厚砂层泥浆护壁引孔预制桩施工技术

Construction Technology of Prefabricated Piles with Thick Sand Layer MudProtectionWall Guiding Hole

结合工程实例,探讨预制管桩基础在厚砂层地质条件下的施工应用。介绍了北方内陆地区含厚砂层条件下,先引孔降低土层阻力,再在砂层部位泥浆护壁避免引孔后坍孔,最后利用静压桩机将预制管桩沉入预定持力层的施工工艺和技术要点,为预制管桩施工提供了新的经验。

Combined with engineering examples,the construction application of prefabricated pipe pile foundation under the geological conditions of thick sand layer is discussed.The construction process and technical points of using a static pressure pile machine to sink the prefabricated pipe pile into the predetermined bearing layer under the condition of thick sand layers in the northern inland region of China are introduced,which involves first reducing soil resistance by guiding holes,then protecting the wall with mud at the sand layer to avoid collapse after guiding holes,and finally providing new experience for the construction of prefabricated pipe piles.