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乌江彭水电站地下厂房母线竖井共5条,布置于大坝右岸地下厂房上游侧,断面尺寸5(5.5)m×6m,单条井深160m,根据需要,每条竖井须设置钢筋混凝土楼梯。钢筋混凝土结构的施工,关键是钢筋混凝土的成型方法,成型方法不同,机具选择、施工组织和技术经济效果也有区别,因此成为设计、施工和建设单位共同关心的问题。常用的成型方法有:预制装配式施工方法、现浇与预制相结合的施工方法、全现浇的施工方法等。乌江彭水电站母线竖井净孔尺寸仅为5m×4m,空间狭窄,井深达160m,楼梯混凝土约760m3,工程量大。由于母线竖井前期开挖施工受施工通道限制及KW51岩溶系统的影响,施工工期已滞后计划较多。因此,母线竖井楼梯的施工关系到整个工期进度,若采用现浇的施工方法已远远达不到施工工期的要求,且不易于施工质量的控制,全盘考虑,母线竖井楼梯选用预制装配式的施工方法。
There are altogether 5 busbar shafts in Wujiang Pengshui hydropower station, which are arranged on the upstream side of the underground powerhouse on the right bank of the dam. The section size is 5 (5.5) m × 6m and the depth of a single well is 160m. Reinforced concrete stairs are required for each shaft as required. The key to the construction of reinforced concrete structure is the method of forming reinforced concrete, the different forming methods, the choice of equipment, the construction organization and the technical and economic effects. Therefore, it becomes a common concern for design, construction and construction units. Common molding methods are: prefabricated assembly-type construction method, a combination of cast-in-place and precast construction methods, all cast-in-place construction methods. The net hole size of bus shaft in Wujiang Pengshui hydropower station is only 5m × 4m, with narrow space, well depth of 160m and stairway concrete of about 760m3. Due to the early excavation of the bus shaft shaft is limited by the construction access and the influence of the KW51 karst system, the construction period has lagged behind. Therefore, the construction of the bus shaft staircase relates to the progress of the entire construction period. If the construction method using cast-in-place is far from the requirements of the construction period, and is not easy to control the construction quality, considering the bus shaft staircase selection of prefabricated Construction method.