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近年,长江三角洲地区的经济发展十分活跃,城市基础设施建设规模不断扩大,一大批结构型式复杂、荷载等级高、跨径大的城市大型、特大型桥梁不断涌现,随着这些桥梁的出现,直径较大、桩长较长的嵌岩桩也而变得十分常见,但,由于该地区复杂的地质条件,常规桩基成孔技术虽然可以在一定程度上满足施工要求,但无论是从经济效益还是施工工期要求上考虑,结果均不能令人满意。因此,笔者以某工程1.5m嵌岩桩为例,对结合使用旋转钻和冲击钻成孔技术进行了探讨,供类似项目桩基施工时参考。
In recent years, the economic development in the Yangtze River Delta has been very active. The scale of urban infrastructure construction has been continuously expanded. A large number of large-scale and large-sized bridges with complex structure types, high load levels and large span have emerged continuously. With the appearance of these bridges, However, due to the complex geological conditions in this area, although the conventional pile foundation hole-forming technology can meet the construction requirements to a certain extent, no matter from the economic benefit Or construction requirements on the consideration, the results are not satisfactory. Therefore, with a 1.5 m rock-socketed pile as an example, the author discusses the combination of the use of rotary drilling and percussion drilling technology for reference for the construction of similar projects.