水电站溢洪道高架塔机拆除施工技术

Construction Technology of Elevated Tower Crane Demolitionfor Hydropower Station Spillway

为满足南屯1水电站溢洪道高架塔机拆除用400 t吊车的承载力和作业宽度,在大坝主体下游临空侧,创新采用叠梁门在相邻闸墩上浇筑混凝土墩搭设简支梁为下游侧吊车前支腿提供支撑;下游侧后支腿采用在溢洪道闸墩上浇筑混凝土墩作为支撑平台;上游侧前支腿和侧后支腿均采用在大坝主体顶面上铺设工字钢作为支撑平台;并利用理论和数值模拟方法,对支撑平台承载力的安全性进行验证,结果表明,支撑平台可满足400 t吊车在拆除高架塔机时的承载力和作业宽度,在总结拆除施工工艺流程和要点的基础上,成功利用废弃叠梁门拆除了南屯1水电站溢洪道高架塔机,取得了良好的经济效益,可为高空受限环境下塔机拆除施工提供有益借鉴。

In order to meet the bearing capacity and operating width of the 400t crane used for the dismantling of the elevated tower crane in the spillway of the Nantun 1 hydropower station,a simple supported beam was innovatively used to support the front legs of the downstream crane by pouring concrete on adjacent gate piers using a stacked beam gate on the free side downstream of the main dam;The downstream side rear support legs are supported by pouring concrete piers onto the spillway gate piers as a support platform;The upstream front support leg and the upstream rear support leg are both supported by laying I-beams on the top surface of the main body of the dam as a support platform;And use theoretical and numerical simulation methods to verify the safety of the supporting platform s bearing capacity.The results show that the supporting platform can meet the bearing capacity and operating width of a 400t crane when dismantling an elevated tower crane.The construction process and key points of dismantling are summarized,and the abandoned stacked beam gate is successfully used to dismantle the elevated tower crane of the spillway of Nantun 1 hydropower station,achieving good economic benefits.This provides a reference for the dismantling of tower cranes in high-altitude restricted environments and has important practical value.