【填空题】
811.正线巡道开通初期3个月内每24小时巡道一次,3个月后视情况可改为每48小时巡道一次。___
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812.50kg/m钢轨曲线型尖轨7号道岔设计动程:168mm。___
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813.道岔辙叉部分查照间隔和护背距离应控制在1391~1394mm、1346~1348mm之间比较合适。___
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814.总磨耗=垂直磨耗+1/2侧面磨耗。___
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815.垂直磨耗在钢轨顶面宽1/2处___测量。___
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816.侧面磨耗在钢轨踏面___下16mm处测量。___
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817.目前我国线路直线地段采用的标准轨底坡为1/40。___
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818.在拨道作业时,一般在直线地段如两股方向大小相差不多时,应以里程方向左股为基本股。___
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819.作业未完,机具未全部下道,线路未恢复到放行列车的条件时,不得撤除防护。___
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820.更换夹板在来车前,最低限度上足2个螺栓。___
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821.线路施工作业时,须在符合规定的施工负责人领导下进行施工。___
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822.轨道由钢轨、轨枕、道床、联接零件、防爬设备和道岔等部件组成。___
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823.在视觉信号中,绿色信号的基本含义是按规定速度运行。___
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824.使用单轨载运钢轨时,一次不得超过2根。___
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825.混凝土轨枕扣件应经常保持位置正确,轨距挡板应靠贴轨底边。___
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826.在线路曲线地段,应根据曲线半径和实测行车速度,在外股钢轨合理设置超高。___
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827.温度应力式无缝线路,一般由固定区、伸缩区、缓冲区三部分构成。___
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828.缓和曲线与直线连接处不得有反弯或“鹅头”。___
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829.钢轨伤损分为重伤、轻伤和折断三类。___
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830.联结零件把钢轨联结起来,使钢轨接头部分具有与钢轨一样的整体性,以抵抗弯曲和位移。___
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831.作业休息时,不准坐钢轨、枕木头及道心。___
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832.异性接头的联结应使两钢轨工作面轨距线与轨顶最高点水平线都相吻合。___
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833.轨道维修贯彻“预防为主,防治结合,修养并重”的原则。___
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834.弹条扣件的弹条中部前端下颏应靠贴轨距挡板或扭矩保持在80~150 N•m。___
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835.复曲线应在正矢递减范围内,从较大超高向较小超高均匀顺坡。___
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836.轨距加宽值应在缓和曲线范围内递减,无缓和曲线时,在直线地段递减。递减率不宜大于2‰。___
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837.滑床板损坏、变形或滑床台磨耗大于5mm时,需及时更换。___
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838.信号标志顺地铁列车运行方向设于轨道线路左侧。___
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839.接触网地段需要拨道时,线路中心位置不得超过±30mm,一年单侧累计拨道量不得超过120mm,超过者需经接触网专业配合。___
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840.曲线两端直线轨向不良,一般应事先拨正,两曲线间直线段较短时,可与两线同时计算、拨正。___
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841.螺纹道钉改道时,应用木塞填满钉孔,钻孔后旋入道钉,可以锤击螺纹道钉___
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842.起、拨道机可以安放在铝热焊焊缝处。___
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843.混凝土枕无缝线路,当轨温在实际锁定轨温减30℃以下时,伸缩区和缓冲区禁止进行维修作业。___
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844.当发现线路连续出现3~5mm的碎弯时,必须加强巡查___,观测轨温和线路方向的变化。___
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845.正线缓冲区轨缝应保持在构造轨缝值范围内,最大不得超过20mm,如轨缝大于规定值,应进行插入短轨头调整。___
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846.为了满足上面对钢轨使用性能的要求,钢轨断面采用抗弯最佳的“H”字形。___
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847.为提高钢轨耐磨和抗压性能,应对钢轨进行全长淬火处理。___
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848.垂直磨耗一般情况下随着轴重和通过总重的增加而增大。___
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849.每块夹板上的螺栓孔6个,圆形孔与长圆形孔相间。___
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850.扣板式扣件主要由扣板、螺纹道钉、弹簧垫圈、铁座及绝缘缓冲垫板组成。___
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851.轨距挡板的作用是调整轨距,传递钢轨的横向水平推力。___
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