Behaviour and design of cured in place liners in noncircular corrugated steel culverts

在加拿大各地，成千上万的旧波纹钢涵洞和下水道需要修复或更换。现场固化管道（CIPP）内衬现在是混凝土和粘土风暴和卫生下水道的公认修复选择。然而，对于波纹钢下水道和涵洞内安装的CIPP内衬，没有既定的设计方法：ASTM F1216中用于刚性下水道内CIPP内衬的程序不适用，因为它们仅适用于圆形或近似圆形结构，B。忽略车辆负载。该项目包括四个阶段：文献综述，全尺寸试验，以调查班轮响应车辆负载，进一步的测试，研究班轮抵抗外部流体负载，和设计程序的发展。第二阶段是在皇后学院的地球工程实验室埋两个椭圆形波纹钢管。 一个涵洞将使用传统的CIPP树脂浸渍毡衬，另一个使用纤维增强的UV固化衬。在修理前后，将进行模拟车辆载荷下的性能测试。测量将确定推力和力矩如何在衬里和旧钢结构中发展，以及衬里-钢涵洞-土壤相互作用的性质。对每个衬砌涵洞进行的最终测试将增加表面荷载，直到强度完全调动，以确定破坏机制。这将是首次进行此类测试。在第三阶段，将在外部流体压力下对两个相同CIPP内衬类型的样本进行测试，以首次测量此类钢涵洞内内衬的屈曲强度。该项目的最后阶段将使用有限元分析来解释测试观察结果，并开发用于选择合适的衬里厚度和聚合物性能的设计方法。两名博士生将接受培训，研究合作伙伴（专业康复承包商）将积极参与，他们随后将在加拿大各地的涵洞项目中使用设计方法。

Across Canada, tens of thousands of old corrugated steel culverts and sewers require rehabilitation or replacement. Cured in place pipe (CIPP) liners are now well established rehabilitation options for concrete and clay storm and sanitary sewers. However, there is no established design method for CIPP liners installed within corrugated steel sewers and culverts: the procedures in ASTM F1216 used for CIPP liners within rigid sewers are not suitable, because they a. are only for circular or almost circular structures, b. neglect vehicle loads. This project involves four phases: a literature review, full scale testing to investigate liner response to vehicle loads, further testing to study liner resistance to external fluid loads, and development of design procedures. The second phase involves burying two corrugated steel pipes with elliptical geometry in the GeoEngineering Laboratory at Queen's. One culvert will be lined using a conventional CIPP resin-impregnated felt liner, and the other using fibre-reinforced, UV cured liner. Performance testing under simulated vehicle loads will be conducted before and after repair. Measurements will establish how thrust and moment develop in the liners and the old steel structure, and the nature of the liner-steel culvert- soil interactions. Final tests on each lined culvert will increase surface load until strength is fully mobilized, to establish the failure mechanisms. These will be the first tests of their kind ever performed.During the third stage, two further samples of the same CIPP liner types will be tested under external fluid pressure to measure, for the first time, buckling strength of liners within these kinds of steel culverts.The final stage of the project will involve use of finite element analyses to interpret the test observations, and to develop design methods for use in selecting suitable liner thicknesses and polymer properties. Two PhD students will be trained and there will be active participation of the research partner (a specialist rehabilitation contractor) who will subsequently use the design methods for culvert projects across Canada.