海上超长大直径嵌岩钻孔灌注桩施工技术

介绍槟城二桥主桥钻孔灌注桩施工技术。马来西亚槟城第二跨海大桥主桥是一座双塔斜拉桥。该桥索塔基础采用21根φ230 cm/φ200 cm变直径钻孔灌注桩,其最大设计桩长为126.9 m,桩端嵌入微风化基岩深度达8 m,最大成孔深度达133.15 m。基于对槟城二桥主桥海上钻孔灌注桩的施工技术管理实践,总结超长钻孔灌注桩的设备选型、成孔、成桩、桩基承载力试验等施工工艺,为同类桩基的施工提供经验。

Construction technology of marine rock-socketed cast-in-situ bored pile of large diameter and super length

This paper focuses on the construction technology of cast-in-situ bored piles of the main bridge of the Second Penang Bridge of Malaysia.The main bridge of the Second Penang Bridge of Malaysia is a double-tower cable-stayed bridge.Each tower is supported by 21 pieces of φ230 ~ 200 cm bored piles with a maximum length of 126.9 m.The piles are designed to be socketed into the penetrating weathered rock layer of 8m in depth,and with a maximum bored-hole layer of 133.15m in length.From the construction management on marine bored pile of the Second Penang Bridge,we sum up construction techniques of the equipment selection,drilling,concreting,statistic test of bored pile and others,and accumulate valuable experience for similar pile construction.