采用钢筋混凝土挡板墙对既有线进行防护，是一种行之有效、经济可靠的方法。

Using the reinforced concrete built-up retaining walls to protect existing lines is an effective, economical and reliable method.

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至少一个防护罩固定到挡板上，并包括设置在防护罩处的至少一个活塞环。

At least one shroud is secured to the baffle plate and includes at least one piston ring disposed at the shroud.

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