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).
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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