Composite shield is characterized by self - driving and cast in site reinforced concrete lining instead of segmental lining.

组合式盾构的特点是能自行推进，可不用装配式衬砌管片，而采用现浇钢筋混凝土衬砌。

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The tie in segment of the diaphragm wall is connected using pre reinforced concrete pile. The foundation strata of two shield well is also reinforced by deep mixing piles in order to seal water.

地下连续墙接头采用预制钢筋砼接头桩连接止水，两端头井辅以深层搅拌桩加固地基。

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Both the drywell and the wetwell are surrounded by a secondary containment vessel (or shield building) also built from reinforced concrete about a meter thick.

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