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674.以下温度中,无缝线路地段当轨温大于实际锁定轨温___时,不允许作业?
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675.以下接头错牙数值中,需要及时进行整改的是___?
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676.拆垫垫片作业时需要带的工具包括___?
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677.下列属于防止线路爬行的措施有___?
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678.关于圆曲线的最小长度,以下说法错误的是___
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679.关于缓和曲线的最小长度,以下说法错误的是___
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680.关于正线一般情况最小曲率半径,以下说法错误的是___
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681.关于正线困难情况最小曲率半径,以下说法错误的是___
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683.关于辅助线困难情况最小曲率半径,以下说法错误的是___
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684.关于车场线一般情况最小曲率半径,以下说法错误的是___
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685.关于车场线困难情况最小曲率半径,以下说法错误的是___
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686.更换钢轨作业的目的是维持线路良好状态,确保地铁列车行车安全。___
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687.当钢轨伤损达到重伤标准,应及时更换。___
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689.换入钢轨与换出钢轨类型不同时,需配备异型夹板及异型垫板。___
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690.切割钢轨时要用电锯全断面锯轨,并使轨顶面与轨头断面垂直,钻眼时要倒棱。___
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691.换轨段为混凝土枕时,应按规定拆卸扣件及接头夹板。拆卸完应整体摆放到相应位置。___
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692.换轨时,轨下大胶垫不得缺少,压溃或缺损的不用换掉。___
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693.换轨段为混凝土枕时,应按规定拆卸扣件及接头夹板。___
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694.钢轨接头错牙不得超过4㎜。___
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695.轨道线路的三大薄弱环节为:道床、曲线、接头。___
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696.接头通常面临的问题是:错牙,松动,轨缝过大,瞎缝,螺栓用力不均等。___
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697.普通钢轨接头鱼尾板安装作业时应在施工区域前后100m设置红闪灯,进行线路封锁。___
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698.普通钢轨接头鱼尾板安装前应将润滑油脂涂在钢轨接头和轨头表面。___
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699.安装鱼尾板时应逐个的拧紧单个螺栓。___
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700.普通钢轨接头鱼尾板螺栓扭一般需要达到500-700N.m。___
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701.更换铁垫板时,不同轨底坡的铁垫板可混合使用。___
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702.更换铁垫板时,更换的铁垫板要与既有的钢轨类型一致。___
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703.测量轨距时,将轨距尺的固定端紧贴一条钢轨的非工作边,另一端放置在另一股钢轨工作边上,并左右移动,直至到最小间距,此时刻度就是准确轨距值。___
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704.轨距尺垂直线路中心线架设在钢轨顶面,读取水平尺的气泡靠近末端相对应的值则为准确水平值。___
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705.轨道巡视的最终目标为维持一个既安全又可靠的地铁列车服务。___
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706.正线开通初期3个月内每24小时巡查一遍。___
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707.人工巡道的周期间隔不应超过48小时。___
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708.车辆段、停车场所有线路每周巡查1遍。___
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709.巡道时应以5km/h左右的速度全面查看线路、道岔。___
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710.巡查时如线路、道岔发生影响行车故障,应立即排查处理并按汇报制度规定向上汇报。___
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712.当钢轨伤损被发现,检查及评估对地铁列车行驶安全的影响后,会帮助及时更换、临时维修、定期检查伤损情况以便日后做出更换的决定。___
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713.线路巡查人员巡经伤损钢轨时,要小心检视,比对伤损的资料,如发现有伤损发展情况,根据钢轨伤损现场标记规定用油漆进行标记,且必须立即通知线路工班长。___
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714.道岔因其构造特点和行车条件都比较复杂,零配件也比较多,是线路的薄弱环节之一,提高道岔的维修质量是保证地铁列车安全平稳通过的必要条件。___
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715.起道地段要有足够的道砟,全面起道,起道量超过40mm时一般应用仪器测量并设置起道标桩,按标桩起道。___
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