u bolt

1. For rock roadway layout layer, the necessity and feasibility of using nude alley, a hell of arch, the U-steel shed, bolt net and spraying and other forms of support are expounded.

针对岩巷布置层位，阐述了采用裸巷、砌碹、u型钢棚、锚网喷等多种支护形式并存的必要性与可行性。

2. Effects of column stiffeners, bolt arrangement, bolt number, U-steel width and U-steel extended length are studied.

研究了柱加劲肋、螺栓排列、螺栓数目、槽钢宽度和槽钢下伸长度等的影响。

3. The mill comprises roll changing hydrocylinder (1), with rolling mill group (3), roll changer (2), post (4), worm wheel lifting gear (5), U-shaped frame (7), rotation ear (8) and bolt (9).

其特征在于本轧机包括换辊液 压缸（1）、换辊小车（2）、轧钢机辊组（3）、立柱（4）、蜗轮升降机构（5）、U型架（7）、转动转耳（8）、连接螺栓（9）；

4. The mill comprises roll changing hydrocylinder (1), with rolling mill group (3), roll changer (2), post (4), worm wheel lifting gear (5), U-shaped frame (7), rotation ear (8) and bolt (9).

其特征在于本轧机包括换辊液 压缸（1）、换辊小车（2）、轧钢机辊组（3）、立柱（4）、蜗轮升降机构（5）、U型架（7）、转动转耳（8）、连接螺栓（9）；

Manufacture LIFTING EYEBOLT , HIGH STRENGTH HEX NUTS , T - BOLT, U - BOLT and SPECIAL FASTENERS.

制造吊环螺丝,高强度螺母, T 型螺丝 、 U型螺丝等非标螺丝.