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广州合银广场工程位于广州市环市东路与淘金路交会处东南侧，地下４层，地上６０层，总建筑面积１１００００ｍ２，总高度２６９．２０ｍ，为外框内筒结构。从地下４层至４４层框架结构中，２２１４００、１５００钢管混凝土柱采用Ｃ７０高性能混凝土。钢材为１６Ｍｎ合金?
The Guangzhou Heyin Plaza Project is located on the southeast side of the intersection of Huanshi East Road and Taojin Road in Guangzhou. It has 4 floors underground, 60 floors above ground, a total construction area of 110,000 square meters, and a total height of 269.20 meters. It is an outer frame inner tube structure. From the underground 4 to 44-story frame structure, the C70 high-performance concrete is used for 221400 and 1500 concrete-filled steel tube columns. Steel is 16Mn alloy?