丰满水电站重建工程老坝拆除施工质量控制

Construction quality control of old dam demolition for Fengman Hydropower Station Reconstruction Project

在丰满水电站重建工程中,新坝建成后需对老坝6#~43#坝段进行缺口拆除。拆除具有工程量大、施工期短、施工强度高、环境复杂、技术要求高等特点。缺口拆除采用爆破拆除方式,拆除总长686 m,缺口底高程为239.90 m,拆除混凝土总量26.64万m3。拆除后的缺口可保证新建机组正常发电过流及大坝泄洪。老坝缺口拆除至239.9 m高程具有前置挡墙作用,可满足夏季下泄水流水温要求和丰满水电站下游鱼类产卵场水温要求。本文详细阐述老坝拆除施工过程中质量控制要点和具体实施情况,全面展现大坝拆除过程,可供类似混凝土大坝拆除施工参考。

In Fengman Hydropower Station Reconstruction Project,a notch demolition of the old dam from the No.6 dam section to the No.43 dam section is necessary to be carried out after the completion of the new dam.The construction of the demolition has the characteristics of large engineering amount,short construction period,high construction intensity,complicated environment and high technical requirement.The blasting demolition mode is adopted for the notch demolition,for which the total length is 686 m,the elevation of the notch bottom is 239.90 m and the gross amount of concrete to be demolished is 266400 m~3.The notch after the demolition can guarantee both the normal flow-passing for the power generation from the newly installed hydropower units and the flood discharge of the dam.The old dam with the demolition notch of the demolished elevation of 239.90 m has an effect of front retaining wall and then can meet both the temperature requirement for the discharging flow in summer and the temperature requirement for the downstream fish spawning ground of Fengman Hydropower Station.The key points of quality control and the specific implementation of the demolition of the old dam is described herein in detail with a comprehensive exhibition of the process of the demolition of the dam,thus a certain reference can be provided for the construction of the demolition of the similar concrete dam.