摘要
在深厚砂层、砂卵石层、抛填层等复杂地层中,直接釆用沉桩设备施工预应力管桩经常会出现沉桩难度大、爆桩率高、管桩难以植入等问题,通常采用长螺旋钻机先引孔后植入管桩的解决方案,引孔后管桩虽可顺利植入,但管桩承载力及成桩质量难以保证。本文通过工程实例,研究出一套适用于该类复杂地层的旋扩工法植桩技术,该技术不仅可以确保桩身质量,提高桩基承载力,同时又可以提高工效,降低造价,为今后遇到类似工况提供了一种行之有效的解决方法。
Problems often arise when directly using pile machines in constructing pre-stressed pipe piles in complex strata such as thick sand layer,sand gravel layer and landfill layer.Some problems include the difficulty in sinking piles,the high rates of bursting,and also the difficulty in implanting pipe piles.Generally,a long spiral drilling machine is used to drill a hole first and then the pipe pile is implanted.Although pipe piles can be implanted smoothly after the hole is drilled,it is difficult to guarantee the bearing capacity and the quality of pipe piles.Therefore,in this paper,using various engineering examples,the rotary expansion construction method of pile-planting technology is developed,which is suitable for complex strata.Hence,this technology can not only ensure the quality of pile body,but also improve the bearing capacity of pile foundation,work efficiency and reduce construction costs.Thus the use of this technology generally provides an effective solution for dealing with similar strata in the future.
作者
曹巍
马齐
张非凡
CAO Wei;MA Qi;ZHANG Fei-Fan(Beijing Rongchuang Geotechnical Engineerrng Co.Ltd.,Beijing 100085,China)
出处
《地基处理》
2020年第1期41-47,共7页
Journal of Ground Improvement
关键词
旋扩工法
预应力管桩
水泥土桩
rotary expansion construction method
prestressed pipe pile
soil-cement pile