钻孔咬合桩施工工艺的探讨

研究目的:(1)探讨咬合桩作为一种新型深基坑围护结构在上海地区地质条件下的实用性和可行性。(2) 为施工积累经验,为设计提供必要的参数。(3)研究咬合桩的工艺特点和应用范围。 研究方法:(1)通过原桩位试桩,确定本工程施工的咬合庄工艺参数,验证实用性。(2)通过咬合桩在邯郸 路地道工程中的应用．验证其优越性、总结成孔及成桩控制质量标准。 研究结果:成功利用咬合桩作为围护结构,保证了深基坑的安全;确定的咬合桩施工参数能有效控制咬合 桩施工:咬合桩机能在较小的空间灵活施工,实用性强。 研究结论:(1)咬合桩适于在上海地区软土及富水土层中施工。(2)咬合桩在不同地质条件下施工,科学地 确定施工技术参数至关重要。(3)钻孔咬合桩施工速度快,效率高,噪音低、震动小、无泥浆作业、成桩质最高、 防渗性能好、施工安全有保障、文明施工程度高、能很好地满足环保要求,利于创造良好的外部形象。(4)钻孔 咬合桩垂直度高,外型标准,防渗能力强,无需泥浆护壁,扩孔系数小,配筋率低,减少混凝土用景。在穿过软弱 富水地层时无需增加其它辅助措施,施工速度快,造价低,具有良好的经济效益。

EXPLORATION ON THE CONSTRUCTION TECHNOLOGY OF DRILL BITING PILE

Research purpose: (1 )The practicability and the possibility of the use of the Biting Pile machine as a new outer protective structure for the deep Dia-Phragm Wall under Shang Hai's geology. (2)To accumulate enough experience for construction and to provide the essential parameters for design. (2 )To study the difference and limitation of the Biting Pile machine. Research methods: (1 )To set the technological parameters of the Biting Pile machine during project constructing and to test the practicability through attempting the peg at the place of the original peg. (2)Through the various application of the Biting Pile machine in Han Dan Tunnel project to test its superiority at the same time may be obtain perpendicular of quality of a product. Research result: The success of using the Biting Pile machine as the protecting structure ensures the security of deep Dia-Phragm Wall. The stimulation test succeeded, the fixed parameters in construction of Biting Pile machine can effectively control the process of construction; the Biting Pile machine can successfully deal with the underground obstacles,across the complex layers and work in a relatively limited place with practicability and the possibility. Research conclusion: (1 )the Biting Pile machine can work in the place of soft clay ground in Shang Hai and the layer rich in water. (2)It is vital to scientifically set the construction technological parameters when it works in different geological condition. (3 )The Biting Pile machine works quickly and efficiently with low noise, little quake, without on mud. And so on.The finished the Biting Pile machine is with high quality, good property of waterproofing. The security and civilized construction meet the demand of protecting environment ,which can create nice external image.(4)The use of Biting Pile machine is perpendicular with standard appearance and the waterproof. It's not need to use mud of protection outer protective to the wall,and enlarge machine parameters. When acrossing the soft and richwater earth, it's need not to take other assist measures. The work efficiency and low price provide profit, to deal with the underground obstacles can work out the unsolved problem and consequently obtain a better economic benefit and social benefit.