The effect method of reinforce and maintenance the stone arch bridge is to build liner around the arch bridge down area. That combines the old arch round and the new reinforced concrete together.

在石拱桥拱圈的下部进行衬砌加固，使老石拱桥拱圈与新钢筋混凝土套拱形成整体，共同受力，是一种维修加固石拱桥的简单实用的方法。

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The wearing question of liner in skip car is a prevalent problem in the iron-making plant, which not only affects good running of the system, but also increases everyday maintenance workload.

高炉料车衬板磨损问题，是炼铁厂普遍存在的难题，它不仅影响炼铁系统的正常运行，而且增加日常维护的工作量。

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The ingredients of acid furnace liner, liner building process and sintering process was introduced, and the method to put the liner into melting and its maintenance was also described in detail.

介绍酸性炉衬的配料成分，炉衬的修筑和烧结工艺，并对炉衬的使用和保养方法作了详细叙述。

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