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挤压式砼边墙技术在简化工序、加快进度、安全生产、降低成本等方面的优势在面板坝上游坡面施工中非常明显,施工实践表明:边墙速度可达40-60m/h,与垫层料铺填可同步上升,边墙施工后的上游坡面可不进行处理,水泥用量一般为70-85kg/m3,渗透系数为10-2-10-3m/s,砼弹性模量5000-10000MPa,挤压强度1.0-3.5MPa,不会对面板造成强约束,无需涂刷乳化沥青等隔离剂,垫层料碾压使用18t自行式振动碾,边角采用10t液压夯板不会对边墙造成破坏,而且节约了一定的施工直接成本;达拉河水电站坝址区冬季严寒,在施工中采取了配合比中掺加防冻剂、拌和加热水、砼罐车包裹保温、成型边墙塑料膜覆盖棉被保温、防冻措施取得了良好的效果,同时,施工实践还表明,垫层料和挤压墙之间未发生脱空现象,使得挤压式砼边墙新技术更为成熟,值得在面板坝施工中推广应用。
Squeeze-type concrete wall technology in the process of simplifying the process to speed up the progress, safety in production, reduce costs and other advantages in the face plate dam slope construction is very obvious, construction practice shows that: the wall speed up to 40-60m / h, and Bedding material bedding can be increased simultaneously, the upper slope after the sidewall construction can not be processed, the amount of cement is generally 70-85kg / m3, the permeability coefficient of 10-2-10-3m / s, the elastic modulus of concrete 5000- 10000MPa, compressive strength of 1.0-3.5MPa, will not cause strong constraints on the panel, without brushing emulsified asphalt and other release agents, cushioning material using 18t self-vibration grinding, the corner with 10t hydraulic ram will not be on the edge The wall caused damage, but also save a certain direct cost of construction; dam site in Dala River hydropower station in winter cold, with the mix in the construction with antifreeze, mixing heated water, concrete tank car wrapped insulation, molding plastic film wall Covering quilts insulation, antifreeze measures have achieved good results, at the same time, construction practice also shows that there is no gap between the cushioning material and the extrusion wall, making the new technology of the extruded concrete wall more mature, it is worth Popularization and Application of the Dam in Construction.