某PC连续箱梁0~#梁段对拉方式支架预压技术

我国桥梁工程建设中,PC连续梁的线型是判断桥梁建设质量的一个重要参数,而0#段作为桥梁线型的起止阶段,对成桥线型起着至关重要的作用。以某PC连续箱梁桥为例,简要介绍桥梁0#段支架预压的目的、基于桥梁0#段各荷载的组合最不利条件下的计算结果、详细阐述了0#段支架采用精轧螺纹对拉的方式预压的技术应用,并给出立模标高详细的计算方法。对比实际高程和理论高程,验证本方案的可行性,为今后其他桥梁0#段支架预压提供技术经验。

Preloading Technology for 0# Girder Segment of PC Continuous Box Girder with Pull Way Bracket

In the construction of bridge engineering in China, the line type of PC continuous beam is an important parameter to judge the quality of bridge construction, and the 0^# section acts as the starting and ending stage of the bridge line type, which plays a vital role in the bridge line type. Taking a PC continuous box girder bridge as an example, this paper briefly introduces the purpose of preloading the 0^# bracket of the bridge. Based on the calculation results under the most unfavorable conditions of the combination of loads in the 0^# segment of the bridge, the technical application of the pre-compression of the 0^# section bracket by the method of finishing rolling thread is introduced in detail, and the detailed calculation method of the vertical model elevation is given. Comparing the actual elevation with the theoretical elevation, the feasibility of this scheme is verified, and the technical experience is provided for the preloading of 0^# brackets of other bridges in the future.