小浪底专用公路改造工程的路面设计及质量控制

发布时间：2019-05-27 21:57

【摘要】：服役年限末或超期服役的水泥路面面临着拆除重建或改造的难题，水泥路面拆除困难，挖除板的废弃造成资源浪费且占用土地，因此，可以对旧水泥路面破碎加铺补强层或者采用碎石化技术。碎石化技术能彻底消除加铺层的反射裂缝，但为美国技术，没有设备和技术转让，只有工程承包，造价很高。目前，对于旧水泥路面的改造工程，，采用最多的为在处理过的旧水泥板上加铺补强层。论文以小浪底专用公路改造工程的路面工程为依托，系统的给出了一套旧水泥路面改造的设计理论，整个设计过程注重资源的再生利用，秉承经济、环保理念。通过对原水泥路面结构、破损病害、承载能力等调查结果的分析，以路面状况指数PCI和断板率DBL评价旧水泥路面的技术状况，结合交通情况，确定旧水泥路面的改造方案；分析了对旧水泥路面的改造方法：直接加铺、打裂压稳、破碎处理及碎石化，并结合小浪底专用公路的实际情况，确定了采用多锤头破碎机破碎水泥板作为下卧层的改造措施。论文分析了基层和面层混合料的材料特性，针对实体工程，提出了增设调平层、采用水泥粉煤灰稳定碎石的方法以减少反射裂缝。基层采用水泥粉煤灰混合料，针对我国规范中关于水泥粉煤灰稳定碎石混合料设计的空白，参考水泥稳定碎石及石灰稳定碎石混合料的设计方法，借鉴前人研究成果，并通过试验研究验证采用“10%粉煤灰掺量”。面层采用橡胶沥青混合料，环保且能提高沥青路面抗变形能力，减小行车噪音；将破碎板顶面当量回弹模量代替新建路面结构计算中的土基模量，按照新建路面进行结构层厚度计算；提出了旧水泥路面破碎处理的施工工艺及要点，破碎水泥板施工工艺流程以及相关的准备工作及控制要求等，为旧水泥路面的破碎处理提供了重要的理论依据和技术支撑。
[Abstract]:The cement pavement which has served at the end of its service life or exceeds the service period is faced with the problem of demolition, reconstruction or reconstruction, and the demolition of the cement pavement is difficult. The waste of resources and the occupation of land are caused by the abandonment of the excavated board. Therefore, The old cement pavement can be broken and reinforced or the broken petrochemical technology can be used. Crushing and petrochemical technology can completely eliminate the reflection cracks in the overlay, but for American technology, there is no equipment and technology transfer, only engineering contracting, the cost is very high. At present, for the reconstruction project of the old cement pavement, the most used is to lay the reinforced layer on the treated old cement board. Based on the pavement engineering of Xiaolangdi special highway reconstruction project, this paper systematically gives a set of design theory of old cement pavement reconstruction. The whole design process pays attention to the recycling of resources, adhering to the concept of economy and environmental protection. Based on the analysis of the investigation results of the original cement pavement structure, damage diseases and bearing capacity, the technical condition of the old cement pavement is evaluated by the pavement condition index PCI and the broken board rate DBL, and the reconstruction scheme of the old cement pavement is determined according to the traffic situation. This paper analyzes the reconstruction methods of the old cement pavement, such as direct paving, fracturing and fracturing stability, crushing treatment and fragmentation, and combined with the actual situation of Xiaolangdi special highway, determines the reconstruction measures of using the broken cement board of multi-hammer crusher as the underlying layer. In this paper, the material characteristics of base and surface mixture are analyzed, and aiming at the solid engineering, the method of adding leveling layer and stabilizing macadam with cement fly ash is put forward to reduce the reflection crack. Cement fly ash mixture is used in the base course. In view of the blank of cement fly ash stabilized macadam mixture design in the code of our country, referring to the design method of cement stabilized macadam and lime stabilized macadam mixture, and drawing lessons from the previous research results, Through the experimental study, it is verified that the content of 10% fly ash is adopted. The rubber asphalt mixture is used in the surface layer, which can improve the deformation resistance of asphalt pavement and reduce the traffic noise. The equivalent springback modulus of the top surface of the broken plate is replaced by the modulus of the soil foundation in the calculation of the new pavement structure, and the thickness of the structural layer is calculated according to the new pavement. The construction technology and key points of broken treatment of old cement pavement, the construction process of broken cement board and the related preparation and control requirements are put forward, which provides an important theoretical basis and technical support for the crushing treatment of old cement pavement.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U418.8;U416.2

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