由于黄河泥沙淤积,防洪水位逐年抬高,原有引黄涵闸工程设计标准普遍不能满足黄河防洪安全的要求。因此,从一九七四年开始了对原有引黄涵闸进行改建加固。引黄涵闸不仅要有足够的长度满足抗渗要求,而且为适应洞身纵向受力不均,要合理分节设置沉陷缝。沉陷缝的接头有平头接口和企 Due to siltation of the Yellow River and flood control water level rising year by year, the design standards of the original Yellow River Culvert project generally can not meet the flood control safety requirements of the Yellow River. Therefore, starting from 1974, the original Yellow River Culvert was reconstructed and strengthened. Not only must the Yellow River Culvert have enough length to meet the requirements of impermeability, but also to adapt to the longitudinal stress of the borehole unevenly, it is necessary to set up subsidence seams reasonably. Subsidence joints have flat head joints and enterprises