Research on Casing Rotator and Full Casing Construction Technology
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摘要: 简述了全回转套管钻机的国内外研究现状和应用领域。主要介绍了QHZ-2000型全回转套管钻机的设计结构、技术参数、关键技术。分析了全回转套管柱、冲抓斗、清障钻具的结构原理和应用特点。总结了全回转套管灌注桩、全套管清障和全套管拔桩的施工流程、机理和适用范围。研究填补了国内自主研发全回转套管钻机的空白,是一种适合在城市施工的绿色环保、广谱安全的无循环桩基施工新设备和新技术。Abstract: The paper summarized the research actuality and application fields both in China and abroad.The design struc-ture, specification and key techniques of QHZ-2000 casing rotator are elaborated.The paper analyzes the structure princi-ple and the application characteristics of casing string, hammer grab and drilling tools for underground obstacles removal;and also summarizes the construction process, mechanism and applicable scope of full casing cast-in-place pile, under-ground obstacles removal and pile extraction in full casing.This study fills the gap of independent research and development of casing rotator in China;it is environmental, universal and safe piling equipment and a new foundation drilling method with no mud used in urban construction and foundation works.
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