bored well

The results indicate that the bored pile works well and has high potential carrying capacity. Under the precondition of construction quality, we can shorten pile's length and reduce investment through the measurement of pile's axial force and pile's end resistance.

结果表明，黄土地区的钻孔灌注桩有较高的承载潜力和良好的工作性状，在保证施工质量的前提下，可借助桩身轴力传递和桩端阻力的量测，缩短桩长，节约投资。

Construction process of underwater bored concrete pile as well as points for attention in construction is briefly introduced. Based upon analysis of engineering quality problems frequently encountered in construction corresponding prevention and treatment measures are proposed in order to ensure trouble-free construction of bored concrete pile.

简述了水下浇筑混凝土的过程及注意要点，分析了水下浇筑混凝土过程中经常遇到的工程质量问题，并介绍了预防及处理措施，以保证钻孔灌注桩工程的顺利进行。

CZ-1200 percussion drill was developed to improve and perfect the performances and structures of CZ-22 cable percussion Rig used in diaphragm wall, bored pile and water well drilling engineering in China.

针对目前国内防渗墙、灌注桩桩孔施工及水井钻凿的主要设备CZ-22型钢绳冲击式钻机在使用过程中的一些不足之处，研制开发了CZ-1200型冲击钻机。

Analysis of water emitting from the top of bored cast-in-situ Pile as well as settlement

钻孔灌注桩桩顶冒水原因分析及处理