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某火电厂进行技术改造,在除氧间2根大梁上新增除氧器1台及部分附属设施,总重2 000 kN。增加的荷载远远超出了大梁的原设计承载力,经分析论证,确定采用粘型钢法进行加固。在理论假定的基础上,正弯矩加固按单筋矩形截面梁抗弯强度理论进行设计,负弯矩加固按相关试验研究公式进行设计。型钢梁的加工制作必须精准,由于型钢梁不易变形,采用“先固定后灌注”的粘贴施工法,并配合剪切键钢板、化学植筋等构造措施以确保新旧结构的联合工作效果。加固施工完毕后,进行了现场加载试验,结果表明,加固效果良好。
A thermal power plant for technological transformation, deaerator between the two beams added deaerator 1 and some ancillary facilities, the total weight of 2 000 kN. The increased load far exceeds the original design capacity of the girder, the analysis demonstrated that the use of sticky steel method for reinforcement. Based on the theoretical assumption, the positive moment reinforcement is based on the flexural strength theory of single-beam rectangular section beam, and the negative moment reinforcement is designed according to the relevant experimental research formula. Bending steel beam must be precise and precise. Because the steel beam is not easy to be deformed, it adopts the construction method of “pouring after fixed first” and the construction measures such as cutting steel plate and chemical planting bar to ensure the joint work of old and new structures effect. After the reinforcement construction, the on-site loading test was carried out, the results show that the reinforcement effect is good.