beam soffit
... beam socket 活动梁承座, 桁梁承座 beam soffit 梁拱腹 beam spacing 梁间距 ...
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空腹式拱桥是指主拱圈和主梁之间用立柱支撑，在主拱圈以上设有腹拱的拱桥。
Empty arch bridge is the arch bridge that USES sign pillar to prop up between the main arch and main beam, and has inner-arch on the main arch.
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