根据桥梁施工规范,预应力理论伸长值的计算应采用实测孔道摩阻系数。随着桥梁预应力筋越来越长特别是曲线变化及现场施工质量的影响,孔道摩阻系数的实际取值对预应力理论伸长量的计算影响也越来越大,如取值偏小会导致有效预应力不足而影响桥梁质量。本文根据设计要求在新建武北编组站彭祺湾铁路中桥施工中进行了现场试验和有益探索。 According to the bridge construction specifications, the calculation of the prestress theory elongation value should use the measured hole friction coefficient. With the increasing of the prestressing tendons of bridges, especially the curve changes and the quality of on-site construction, the actual values ​​of the frictional coefficient of the channels have more and more influence on the calculation of the prestressing theoretical elongation. For example, Will lead to insufficient effective prestress and affect the bridge quality. According to the design requirements, this paper carried out field experiments and beneficial exploration in the construction of Pengqiwan Railway Bridge in WuBei Marshalling Station.