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Abstract The dimensions of underground main and auxiliary powerhouse for the Xiaowan hydropower station is 79.18 m in height，28.0 m in width (the largest width is 30.6 m)，and 298.1 m in length. Two bridge cranes of 26 m in span and 800/160/10 tonnage in capacity are installed in the main powerhouse. The corresponding maximum design vertical wheel load acting on the girder is 840 kN per meter. The scale and capacity of the rock-bolt crane girder ranks the first class in the practices of domestic underground powerhouse construction，which is 3.63 m in height，2.8 m in width，and 271 m in single side length. Although rock-bolt crane girders have been widely applied to the underground powerhouse operation，yet nowadays there are still no specified design methods customized in the hydropower industry. According to the practices carried out in the Xiaowan project，the calculation results and monitoring data are systematically analyzed；the structural designs and support measures are discussed for the rock-bolt crane girder of the underground powerhouse. Several concerns in the designs for the rock-bolt crane girder are enlightened，which are managed and solved successfully in the engineering practice.
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Received: 27 September 2012
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2013, Vol. 32 
