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.
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.
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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