摘要
研究目的:双块式无砟轨道是在连续配筋混凝土路面工程的基础上发展而来的,深入分析配筋混凝土路面的结构设计,对比双块式无砟轨道的结构设计,从而为高速铁路双块式无砟轨道的结构设计提供参考。研究结论:连续配筋的混凝土路面结构纵横向没有伸缩接缝,但由于温度荷载会使在自由端部的75m范围内发生总量大约3～5cm的位移,故在端部通常采用锚固装置或多处设胀缝的设施,将端部位移逐步分散、消失。连续配筋的混凝土路面的裂缝宽度以不严重渗水为好,一般应小于0.6mm,低温下应不大于1.0mm;配筋率约为0.5%～0.8%,钢筋一般采用单层布置。路面板铺设在沥青处理的基层或整平层上对控制横向裂缝较好。德国双块式无砟轨道配筋率为0.8%～0.9%,裂缝设计控制宽度为0.5mm,裂缝间距为2m左右,钢筋采用单层配筋,设置在道床板的中下层。我国CRTSⅠ型双块式无砟轨道为使道床板能够承受更大的弯矩变形,道床板厚度设计为260mm,并采用双层配筋的方式。
Research purposes： The doubkle- block slab ballastless track is developed from continuous reinforced concrete pavement. Analyzing the structural design of reinforced concrete pavement and making comparison between the structural design of reinforced concrete pavement and the structural design of double - block slab ballastess track can provide reference to the structural design of double - block slab ballastless track of high - speed railway. Research conclusions： The structure of continuous reinforcement concrete pavement has no expansion joints in lateral or longitudinal direction. But because of temperature load, about 3 to 5 centimeters displacement may occur within 75 m regions of the free end. So the anchor device is installed in the end part or expansion joints are usually laid in many places to spread and eliminate the displacement in end part. The crack width of continuous reinforcement concrete pavement should be less than 0.6 mm without severely seepage, and it should be less than 1.0 mm under condition of low temperature. The reinforcement ratio is about 0.5% to 0.8% and reinforcement is of single - layer. The pavement slab should be laid on bitumen -treated basis layer or leveling course to better control the lateral crack width. For the German double -block slab ballastless track, the reinforcement ratio is 0.8% -0.9%, the crack width of designed control is 0.5 mrn, the gap between cracks is about 2 m, and the reinforcement is laid on the middle or low layer with single -layer. For Chinese CRTS I double -block slab ballastless track, the design slab thickness is 260 mm and the reinforcement is of double - layer in order that the slab can bear bigger bending deformation.
出处
《铁道工程学报》
EI
北大核心
2010年第6期18-22,共5页
Journal of Railway Engineering Society
关键词
无砟轨道
混凝土路面
连续配筋
裂缝宽度
雷达2000
旭普林
CRTSⅠ型
ballastless track
concrete pavement
continuous reinforcement
crack width
Rheda 2000
Zublin
CRTS I double -block slab ballastless track
作者简介
王森荣，1980年出生，男，工程师。
