The design and construction of prestressed anchor bar in pit supporting structure of row of piles are key about safety of foundation pit.
排桩预应力基坑支护结构中预应力锚杆的设计和施工是关系基坑安全大计的关键。
Analyzing the result data of the grouting tests, the writer raises some recommendations about construction process and parameters such as hole arrangement, hole row gap and grouting pressure.
通过对灌浆资料成果分析，对布孔形式、孔排距、灌浆压力等施工参数和施工工艺提出了建议。
In this article, the principle, construction and use of the measuring instrument for preloads in double row cylindrical roller bearings used in machine tool spindles are narrated.
本文叙述了机床主轴部件常用的双列圆柱滚子轴承预紧量测量仪的原理、结构和使用方法。
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