某抽水蓄能电站地下厂房结构加固设计

某抽水蓄能电站地下厂房的梁、板等多处出现裂缝,结构安全评估结果认为结构整体是安全的,但裂缝会对混凝土的耐久性产生不利的影响,并有可能加剧构件的疲劳损伤。本文在结构安全评价的基础上,提出了采取化学灌浆、粘贴碳纤维布、增加钢肋板和钢次梁等局部加固处理方案。按照加固方案,开展了粘贴碳纤维层数的计算方法、钢肋板的布置及连接方法、钢次梁与楼板的连接方式等方面的研究,完成了某水电站厂房局部加固处理设计。加固设计应用结果表明,加固方案能够限制裂缝的进一步发展,适当增加结构刚度,有效提高构件抗疲劳的安全储备。

The structure strengthening design on underground powerhouse of a pumped-storage power station

Some cracks have been found in the slabs and beams of underground powerhouse of a pumped-storage power station. The results of structural safety assessment showed that the whole structure was safe, but the cracks would adversely affect the durability of concrete, and even aggravated the fatigue damage of structures. The methods of local reinforcement are put forward which include chemical grouting, pasting carbon fiber reinforced polymer(CFRP) sheets, adding steel ribbed panels between beams and slabs, and putting up steel secondary beams at bottom of the long span slabs. This paper expounds the research methods of structure strengthening design, including the CFRP layers, the layout and connection of steel ribbed panels, and the connection of steel secondary beams and slabs. The research result of strengthening method showed that the further development of cracks have been restricted, and the safety of anti-fatigue components have been improved effectively, which ensure the safe operation of the plant. The results of this study can be used for similar projects.