张营周

摘 要：铁路预制箱梁会受到各种影响，从而造成出现裂缝现象，如果不对其进行及时处理，预制箱梁的受力情况将会受到严重威胁，可能会造成比较严重安全事故，如今我国裂缝修补的方法比较多，文章使用了一种新型结构胶作为修补材料，该材料具有高强度、低粘度的特点，所以可以采用无压力渗透灌浆方式对箱梁裂缝进行修补。文章首先对该新型结构胶的性能进行分析，分析温度、固化剂用量和活性稀释剂用量对新型结构胶性能的影响，发现温度对新型结构胶粘度的影响最大，然而对结构胶力学性能的影响可以忽略不计;提高固化剂用量和降低活性稀释剂用量可以提高结构胶的强度。然后分析了将新型结构胶应用到箱梁裂缝的修补中发现经过新型结构胶修补之后的箱梁其强度可以提高24%到120%，且应用新型结构胶还具有比较好的抗硫酸盐腐蚀、抗冻性能和抗渗性能。

关键词：新型结构胶;预制箱梁;裂缝;修补

中图分类号：TQ436+.2 文献标识码：A 文章编号：1001-5922（2021）04-0180-04

Abstract：Railway prefabricated box girder will be affected by various factors， which will cause cracks. If it is not dealt with in time， the stress situation of precast box girder will be seriously threatened， which may cause more serious safety accidents.Nowadays， there are many ways to repair cracks in my country. The paper uses a new type of structural adhesive as the repair material. This material has the characteristics of high strength and low viscosity， so it can be used to repair the cracks of the box beam by pressureless grouting. The paper first analyzes the performance of the new structural adhesive， analyzes the effects of temperature， amount of curing agent and reactive diluent on the performance of the new structural adhesive， and finds that temperature has the greatest impact on the viscosity of the new structural adhesive， however the effect on the mechanical properties of the structural adhesive is negligible; increasing the amount of curing agent and reducing the amount of reactive diluent can increase the strength of the structural adhesive. Then analyzed the application of the new structural glue to the repair of cracks in the box girder and found that the strength of the box girder repaired by the new structural glue can be increased by 24% to 120%， and the application of new structural adhesive also has better resistance to sulfate corrosion， frost resistance and impermeability.

Key words：new structural adhesive; prefabricated box beam; crack; repair

如今我國铁路发展迅猛，预制箱梁具有广泛的应用，因为其制作方式比较简单，而且成本较低，能够提高其施工效果，所以预制箱梁在铁路桥梁中常常被使用。虽然铁路预制箱梁的优势较多，具有比较好的抗扭能力、抗弯能力，但是在长时间的使用过程中比较容易发生裂缝[1-2]。当预制箱梁出现小裂缝之后，就会降低该裂缝所处结构的强度，还会出现渗漏、造成严重腐蚀，最终影响铁路预制箱梁的耐久性，没有及时进行修补还会造成更加严重的安全事故[3-4]。……