prestressed concrete i type beam 预应力混凝土i型梁
I-type steel beam 工字型钢梁
I-type curved beam 工字形曲梁
new type i-beam for mining 新型矿用工字钢
The authors participated in the calculation and evaluation and proposed measures of I-type steel beam spans, bearing in mind the principle of safety, quickness and economy.
笔者参与了这些桥梁的安全验算和评价，结合安全、快捷、经济的处理原则，提出采用“工”字钢梁跨越的处理措施。
A kind of new type I-beam for mining is introduced.
介绍了一种新型矿用工字钢。
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