一、工程概况鞍钢第一初轧厂大修期间,正值鞍山地区的严寒季节,250吨中剪机钢筋混凝土基础的养护期是影响总工期的关键。因此要求对中剪机钢筋混凝土基础采取特别有效的早强措施,以达到冬期快速施工的目的。 250吨中剪机钢筋混凝土基础的使用要求高,除承受上部20吨荷载外,剪切钢坯时约有200吨剪力,剪断钢坯时伴生周期性的强烈震动。剪断前,摆动辊道还对基础部分施以300公斤左右的水平推力。该基础混凝土既要可靠地锚固M48地脚螺栓,又要承受钢 I. Project Overview During the overhaul period of the Anshan Iron and Steel First Rushing Plant, which coincided with the severe cold season in Anshan, the maintenance period of 250 tons of medium shear steel reinforced concrete foundation was the key to affecting the total construction period. Therefore, it is required to take effective early strength measures for the concrete foundation of the medium shearer to achieve the purpose of rapid winter construction. The use of 250 tons of medium-shear reinforced concrete foundation requires high, in addition to withstand the upper 20 tons of load, when the shear billet has about 200 tons of shear, shearing the billet associated with the periodic strong vibration. Before the shearing, the swinging roller path also exerts a horizontal thrust of about 300 kilograms on the base part. The foundation concrete must not only anchor the M48 anchor bolt reliably, but also bear the steel.