铁路基床橡胶沥青水泥基防水层施工工法研究

Study on Construction Method for Rubber Asphalt Cement-based Waterproof Layer of Railway Subgrade Bed

传统路基基床土工材料防水层存在施工接缝多,易形成水囊等不足,其长期防水效果难以保证,易导致铁路膨胀土路基基床产生诸如翻浆、冒泥、鼓起、下沉外挤等病害。为彻底解决这些不足,确保膨胀土基床长期稳定性,研究开发了具有良好抗裂、抗渗、抗疲劳性能的橡胶沥青水泥基防水材料,并结合实际工程形成了工厂化制备,现场连续摊铺、碾压的施工工法。工法提出了防水结构层施工工艺流程、操作要点、施工机具等,并从EVd、力学强度、密实度、抗渗性能等方面提出了检验和验收要求,进一步确保了橡胶沥青水泥基防水结构层的施工质量满足相关规范、标准要求。

There are many construction joints in the traditional subgrade bed geotechnical materials waterproof layer,which are easy to form water sac. But the long-term waterproof effect can t be guaranteed and the diseases of railway swelling soil subgrade bed such as mud-pumping,swelling and sinking extrusion etc. may occur. In order to solve these problems thoroughly and ensure the long-term stability of expansive soil foundation bed,rubber asphalt cement based waterproof material with good properties of crack resistance,impermeability and fatigue resistance is developed. Combined with the actual project,the construction method of factory preparation,continuous paving and rolling on site is formed. The construction process,operation points and construction tools of waterproof structure layer are put forward,and the inspection and acceptance requirements from EVd,mechanical strength,density,impermeability and other aspects are put forward to further ensure the construction quality of rubber asphalt cement-based waterproof structure layer meet the relevant specifications and standards.