小湾工程岩壁吊车梁的关键技术问题研究

STUDY OF KEY TECHNICAL ISSUES OF ROCK-BOLT CRANE GIRDER FOR XIAOWAN PROJECT

小湾水电站地下主副厂房高79.18 m、宽28.0 m(最大宽度30.6 m)、长298.1 m。地下厂房安装2台800/160/10 t桥式吊车,吊车跨度为26 m,最大设计竖向轮压为840 kN。岩壁吊车梁高度为3.63 m,宽度为2.8 m,单边长度为271 m,其设计尺寸及吨位均居国内前列。岩壁吊车梁在地下厂房工程建设中已被广泛采用,但目前水电行业尚无规范明确其设计方法。围绕小湾工程,综合分析计算及工程监测的成果,研究讨论地下厂房岩壁吊车梁结构设计和支护工程措施的关键技术问题,提出岩壁吊车梁设计关注点,并在工程中加以实践并成功应用。

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.