对隧洞围岩条件良好洞段，论证取消隧洞原圆形钢筋混凝土衬砌，选定马蹄形锚喷断面作为最终优化断面形式。
For tunnel sections with good surrounding rocks, the U-shaped rock-bolted section is selected as a final optimized section instead of the original circular reinforcement concrete lining section.
最终产品为圆管，方管，矩形管，管子断面从1英寸至5英寸。
The final product is tubes round, square, and rectangular. form 1in to 5in (regular sections).
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