During the construction of double-arched tunnel, the role of center pillar is of great importance.
在连拱隧道施工中，中隔墙扮演着至关重要的角色。
Vault: in building construction, an arched structure forming a ceiling or roof.
拱顶：房屋建造中用拱作成的天花板或屋顶。
Vault: in building construction, an arched structure forming a ceiling or roof.
拱顶：房屋建造中用拱作成的天花板或屋顶。
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