四舱预制拼装管廊横向接头加速腐蚀前后力学性能试验研究

Experimental Study on Mechanical Properties of Transverse Joints of Four cabin Prefabricated Pipe Gallery Before and After Accelerated Corrosion

大断面四舱预制拼装综合管廊横向接头耐久性研究尚属于起初阶段,对大断面管廊的横向接头耐久性的认识不够清晰,为了大断面综合管廊预制拼装工艺向工业化生产方向推进提供科学数据,为当地四舱预制拼装综合管廊的标准制定提供科学数据,以相关的理论为基础,设计了两种构造的横向接头,通过制作相应的足尺模型进行试验研究并掌握大断面预制拼装综合管廊横向接头的耐腐蚀性.试验研究表明,加速腐蚀试验后在各个工况下工字钢接头与环形螺纹筋接头力学性能及耐久性均能满足规范要求;对比加速腐蚀前后两种接头各项性能指标,加速腐蚀试验对环形螺纹筋力学性能影响较小,就耐久性而言,环形螺纹筋横向接头更优;加速腐蚀后各设计荷载试验工况下试验构件各部分均未发生破环,两种横向接头均满足设计要求且具有较大的安全储备,满足耐久性要求.

The research on the durability of the transverse joints of the large section four cabin prefabricated integrated pipe gallery is still in the initial stage.The understanding of the durability of the transverse joints of the large section pipe gallery is not clear enough.It provides scientific data for the advancement of the large section integrated pipe gallery prefabricated assembly process to the direction of industrial production.Scientific data are provided for the standard formulation of the local four cabin prefabricated integrated pipeline gallery.Based on related theories,two types of transverse joints are designed,and the corresponding full scale models are made for experimental research and master large section prefabricated assembly.The corrosion resistance of the horizontal joints of the comprehensive pipe gallery is tested.Experimental research shows that the mechanical properties and durability of I beam joints and annular threaded steel joints under various working conditions can meet the requirements of the specification after the accelerated corrosion test;the performance indicators of the two joints before and after the accelerated corrosion are compared,and the accelerated corrosion test has a slight effect on the ring.The mechanical properties of the threaded tendons are less affected.In terms of durability,the annular threaded tendon transverse joint is better;after the accelerated corrosion,no damage is found to all parts of the test member under the design load test conditions,and both types of transverse joints have met the design requirements and has a large safety reserve to meet the durability requirements.