针对板式桥梁经常出现的铰缝病害,文中以近年来出现的桥下化学注胶方法为研究对象,以京石高速公路K244+039小桥为工程实例,结合现场实测数据,对板式桥梁在原桥完好、加固前(病害桥)、加固后3个不同时期的受力状态进行分析。分析可知,用化学注胶加固板梁铰缝后,板梁间横向荷载传递能力得到了加强,增强了各板梁共同受力能力,提高了桥梁整体的承载能力。 In view of the hinge cracks often appearing on the slab bridges, this paper takes the chemical injecting method under the bridge in recent years as the research object. Taking the K244 + 039 small bridge on the Jingshih Expressway as an example, with the actual measured data of the slab bridge, Intact, pre-reinforcement (disease bridge), strengthened three different periods of stress state analysis. Analysis shows that, with chemical injection plastic plate girder joint reinforcement, the transverse load transfer between the plate girder has been strengthened to enhance the common force of the plate girder and improve the overall carrying capacity of the bridge.