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提出采用灌芯加固和悬吊加固相结合的方法提高预制空心楼板承载能力,重点讨论了灌浆加固注浆方法、悬吊加固锚固方式、钢丝绳数量不同对加固性能的影响以及钢丝绳的受力状态。进行7块试件在均布荷载作用下的静力试验,其中2块为对比试件,2块为灌浆加固试件,3块为钢丝绳悬吊加固试件。结果表明:钢丝绳悬吊加固使预制空心楼板极限承载力提高45%~74%,极限位移提高175%~195%;从经济性、施工作业量、承载力提高程度以及预应力钢筋的受力情况综合考虑,4根钢丝绳加固效果最佳,越靠近中间的钢丝绳所起作用越大;该方法加固效果显著,可为加固预制空心楼板的实际应用提供一定借鉴。
It is proposed to improve the bearing capacity of prefabricated hollow slab by combining filling irrigation and suspension reinforcement. The grouting reinforcement grouting method, the method of suspension reinforcement and anchoring, the influence of different quantity of steel wire rope on the reinforcement performance and the stress state of the steel wire rope . The static test of seven specimens under uniform load was carried out. Two of them were comparative specimens, two of which were grouting reinforcement specimens and three of which were steel rope suspension reinforcement specimens. The results show that the ultimate strength of prefabricated hollow slab is increased by 45% -74% and the ultimate displacement is increased by 175% -195% with the suspension reinforcement of steel wire ropes. From the aspects of economy, construction workload, bearing capacity improvement and prestressing force Considering synthetically, the reinforcement effect of the four steel wire ropes is the best, and the closer the wire rope in the middle is, the greater the effect is. The reinforcement effect of the method is remarkable, which can provide some reference for strengthening the practical application of the prefabricated hollow slab.