【判断题】
接头螺栓以抗拉强度划分为10.9级与8.8级两种高强度螺栓
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相关试题
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改道时，木枕地段应使铁垫板外肩靠贴轨底边
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铺设非标准长度钢轨或再用轨，无特制缩短轨时，钢轨接头可采用相错式，其相错量不得小于3m
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轨端或轨顶面剥落掉块，其长度超过15mm，深度超过4mm判定为重伤
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采用相错式时个别插入的短轨，宜铺设在曲线两端的直线上，在困难条件下，可铺设在曲线内股
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钢轨锈蚀，除锈后轨底边缘处厚度不足5mm或轨腰厚度不足8mm时，判定为重伤
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钢轨顶面上有长大于50mm，深大于8mm的掉块，判定为折断
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在钢轨上钻螺栓孔时必须倒棱，两螺栓孔的净距，不得小于孔径的两倍，直径不同时按小孔径计算
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杭州地铁正线及试车线上曲线实设超高最大不得大于120mm
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道岔后直向连接曲线半径不得小于该道岔曲线半径；
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辙叉心、辙叉翼轨面剥落掉块，长度超过15mm，深度超过3mm，判定为轻伤标准
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第一牵引点（分动外锁闭）或者连接杆（联动内锁闭）之后，尖轨侧面磨耗达到7mm时需进行更换
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实际锁定轨温不在设计锁定轨温范围内，或左右股长轨条的实际锁定轨温相差超过5℃时，需进行应力放散或调整
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在道口处的道路上应设置道口标志和护桩，道口标志设在通向道口、距道口最外股钢轨不小于3m处的道路右侧，护桩设在道口附近的道路两侧
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线路标志在单线上顺计算里程设于轨道线路右侧，在双线上各设于本线地铁列车运行方向右侧
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一般情况下，警冲标设在会合轨道线路两线间距为2.5m的起点处中间
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混凝土枕地段捣固时，应在钢轨两侧各450mm范围内均匀捣实道床。靠近捣固范围的枕下道床，应填充饱满
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碎石道床线路直线地段轨向不良，不可用目测方法拨正
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木枕地段无缝线路作业轨温按表和表规定减5℃，当轨温在实际锁定轨温减20℃以下时，伸缩区和缓冲区禁止进行维修作业
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放散应力时，应每隔50～100m设一位移观测点观测钢轨位移量，及时排除影响放散的障碍，达到放散均匀
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每千米轨道线路动态评定标准为，扣分总数在100分以内为优良，扣分总数在101～300分之间为合格，扣分总数在300分以上为失格
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一般情况下，正线开通初期5个月内每24小时巡道一次，5个月后视情况可改为每48小时巡道一次
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我国螺栓划分为8.8和10.9两个等级，其抗拉强度相就应为830和1040MPa
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杭州地铁4号线正线主要采用扣件的型号为DTⅥ2-1型扣件
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混凝土枕的高度在整个轨枕上是不一致的,轨下部分高些,中间部分矮些
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混凝土枕纵向通裂，包含挡肩顶角缝宽1.5mm或纵向水平裂缝基本贯通（缝宽大于0.5mm），判定为失效
【判断题】
混凝土枕横裂或斜裂接近环状裂纹（残余裂缝宽度超过0.5mm或长度超过2/3枕高），判定为失效
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931木枕受机械磨损，经削平或除去腐朽木质后，容许速度大于120km/h的线路，其厚度不足140mm，其他线路不足100mm，判定为失效
【判断题】
桥梁上道砟槽内道床厚度不应小于250mm，与两端的道床厚度差应在桥台外不小于10m范围内递减
【判断题】
正线、辅助线、出入段（场）线和试车线应采用一级道砟。车场线可采用二级道砟
【判断题】
轨下部位混凝土道床厚度，直线地段不宜小于130mm、曲线地段不宜小于110mm
【判断题】
整体道床应设铺轨基标，基标宜设在排水沟内，并宜每隔15~24m保留一个供维修用的永久基标
【判断题】
为了满足车辆检修库内检修工作的需要，轨下结构设计为坑道式的结构，称为检查坑
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铺设混凝土枕的线路、道岔，使用弹条扣件时，因扣件的技术性能好，能保持较大的防爬阻力，可不安装防爬设备
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钢轨波浪型磨耗谷深超过0.5mm时属轻伤
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在双线曲线地段实设最大超高不得大于150mm
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起道在20mm左右时，扒道砟应扒至和轨枕底成水平
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50kg/m钢轨轨端至第一螺栓孔中心距离为66mm
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60kg/m钢轨第一螺栓孔至第二螺栓孔中心距离为140mm
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