【判断题】
滑床板损坏、变形或滑床台磨耗大于3mm时,需及时更换
A. 对
B. 错
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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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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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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
A. 对
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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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起、拨道机可以安放在铝热焊焊缝处
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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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当发现线路连续出现3~5mm的碎弯时,必须加强巡查(可跟车巡查),观测轨温和线路方向的变化
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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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巡道作业时应以3km/h左右的速度全面查看线路及道岔相关设备
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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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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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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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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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地面正线宜采用木枕碎石道床
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车场库内线应采用短枕式整体道床。根据检修工艺要求,可采用检查坑整体道床或立柱式道床结构
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正线、出入线、试车线的整体道床与碎石道床间应设轨道弹性过渡段。同一曲线地段宜采用一种道床型式
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正线、联络线、出入线和试车线无缝线路地段碎石道床道砟肩宽不应小于400mm,非无缝线路地段道砟肩宽不应小于300mm
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在曲线半径较小的混凝土枕地段,如采用保持轨距能力较强的弹性扣件,则可不安装轨距杆和轨撑
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