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【单选题】
钢丝绳的安全系数是___
A. 钢丝绳破断拉力与允许拉力的比
B. 钢丝绳允许拉力与破断拉力的比
C. 钢丝的破断拉力与允许拉力的比
D. 钢丝允许拉力与破断拉力的比
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相关试题
【单选题】
___主要用来夹紧钢丝绳末端或将两根钢丝绳固定在一起。
A. 卡环
B. 绳夹
C. 吊钩
D. 吊环
【单选题】
多次弯曲造成的___是钢丝绳破坏的主要原因之一。
A. 拉伸
B. 扭转
C. 弯曲疲劳
D. 变形
【单选题】
钢丝绳在卷筒上缠绕时,应___。
A. 逐圈紧密地排列整齐,不应错叠或离缝
B. 逐圈排列,不可以错叠但可离缝
C. 逐圈紧密地排列整齐,但可错叠或离缝
D. 随意排列,但不能错叠
【单选题】
在起重作业中广泛用于吊索、构件或吊环之间的连接的栓连工具是___。
A. 链条
B. 卡环
C. 绳夹
D. 钢丝绳
【单选题】
千斤顶工作时,放在平整坚实地面并要在其下面垫枕木、木板或钢板的目的是___。
A. 加大千斤顶的举升力
B. 扩大受压面积,防止塌陷
C. 缩小受压面积
D. 加大千斤顶的顶升高度
【单选题】
千斤顶是一种用比较小的力就能把重物升高、降低或移动的简单机具,结构简单,使用方便,承载能力可从1t~300t,顶升高度一般为___,顶升速度可达10~35mm/min。
A. 1200mm
B. 900mm
C. 600mm
D. 300mm
【单选题】
起重桅杆拉索与地面的夹角一般为___。
A. 10~30°
B. 30~45°
C. 45~60°
D. 60~75°
【单选题】
起重桅杆为立柱式,用绳索(缆风绳)绷紧立于地面。绷紧一端固定在起重桅杆的顶部,另一端固定在地面锚桩上。拉索一般不少于___根。
A. 2
B. 3
C. 4
D. 5
【单选题】
桅杆组装时,如倾斜于地面,其倾斜角一般不大于___。
A. 10°
B. 15°
C. 20°
D. 25°
【单选题】
起重作业中,除了___外均可用地锚来固定。
A. 拖拉绳
B. 缆风绳
C. 动滑轮
D. 卷扬机
【单选题】
使用滑轮的直径,通常不得小于钢丝绳直径的___倍。
A. 16
B. 12
C. 8
D. 4
【单选题】
履带式起重机用于双机抬吊重物时,分配给单机重量不得超过单机允许起重量的___,并要求统一指挥。抬吊时应先试抬,使操作者之间相互配合,动作协调,起重机各运转速度尽量一致。
A. 25%
B. 50%
C. 80%
D. 100%
【单选题】
汽车式起重机约70%以上的翻车事故是因___造成的,因此,在使用汽车起重机时应特别引起重视。
A. 大风
B. 超载或支腿陷落
C. 道路不平
D. 无人指挥
【单选题】
轮胎式起重机的行驶和起重操作同在一室,___为轮胎。
A. 回转装置
B. 变幅装置
C. 起升装置
D. 行走装置
【单选题】
汽车式起重机的支腿处必须坚实,在起吊重物前,应对支腿加强观察,看看有无陷落现象,有时为了保证安全使用,会增铺垫道木,其目的是___。
A. 加大承压面积
B. 减小承压面积
C. 减小对地面的压力
D. 增大对地面的压力
【单选题】
在起重作业中,___斜拉、斜吊和起吊地下埋设或凝结在地面上的重物。
A. 允许
B. 禁止
C. 应设专人监控
D. 采取措施后可以
【单选题】
在桅杆起重吊装过程中,工件绝对禁止碰撞___
A. 索具
B. 吊具
C. 桅杆
D. 卡环
【单选题】
大型吊车双吊车吊装时,溜尾最好采用___
A. 单吊点
B. 双吊点
C. 多吊点
D. 对称吊点
【单选题】
建筑拆除工程的施工方法有人工拆除、机械拆除、___三种。
A. 人力拆除
B. 工具拆除
C. 爆炸拆除
D. 爆破拆除
【单选题】
拆除工程的建设单位与施工单位在签订施工合同时,应签订___协议,明确双方的安全管理责任。
A. 质量
B. 安全生产管理
C. 资金拨付
D. 施工进度
【单选题】
拆除施工采用的脚手架、安全网,必须由___搭设,经有关人员验收合格后,方可使用。
A. 安全部门
B. 专业人员
C. 施工人员
D. 作业人员
【单选题】
拆除施工严禁___作业。水平作业时,各工位间应有一定的安全距离。
A. 高处
B. 混合
C. 立体交叉
D. 多工种
【单选题】
拆除作业人员必须配备相应的___用品,并正确使用。
A. 防毒
B. 安全
C. 防护
D. 个人劳动保护
【单选题】
装载机前轮应与沟槽边缘保持不少于___m的安全距离,并放置档木挡掩。
A. 2
B. 3
C. 4
D. 5
【单选题】
多台铲运机联合作业时,各机之间前后距离不得小于___m。
A. 2
B. 5
C. 7
D. 10
【单选题】
使用挖掘机拆除构筑物时,在挖掘机驾驶室与被拆除构筑物之间留有___空间。
A. 1m
B. 2m
C. 3m
D. 构筑物倒塌的
【单选题】
挖掘机作业时___不得在铲斗回转半径范围内停留。
A. 任何人
B. 非工作人员
C. 工程技术人员
D. 围观群众
【单选题】
高压线下,两侧___m以内不得安装打桩机。
A. 3
B. 15
C. 10
D. 20
【单选题】
雷电天气无___的桩机,应停止作业。
A. 缆风绳
B. 避雨棚
C. 避雷装置
D. 保险装置
【单选题】
桩机作业结束后,应将桩锤落下,切断___和电路开关、停机制动后人可离开。
A. 电源
B. 水源
C. 气源
D. 油路
【单选题】
桩机起落机架时,应设专人指挥,指挥旗语___ 准确、清楚。
A. 口语
B. 手语
C. 哨音
D. 喊声
【单选题】
桩锤在施打过程中,操作人员必须在距离桩锤中心___以外监视。
A. 2m
B. 3m
C. 4m
D. 5m
【单选题】
___以上大风时,桩机应停止作业。
A. 4级
B. 5级
C. 7级
D. 6级
【单选题】
振动器操作人员应掌握一般安全用电知识,作业时应穿绝缘鞋、戴___。
A. 绝缘手套
B. 帆布手套
C. 防护目镜
D. 线手套
【单选题】
木工机械距闸箱水平距离不得大于___m,以便发生故障时,迅速切断电源。
A. 1
B. 2
C. 3
D. 4
【单选题】
钢筋机械切料时,作业人员应在___握紧并压住钢筋以防末端弹出伤人。
A. 固定刀片一侧
B. 活动刀片一侧
C. 两侧
D. 左侧
【单选题】
钢筋弯曲机弯钢筋时,严禁在弯曲钢筋的作业半径内和机身不设___的一侧站人。
A. 防护装置
B. 漏电保护器
C. 固定销
D. 活动销
【单选题】
冷拉钢筋运行方向的端头应___,防止在钢筋拉断或夹具失灵时钢筋弹出伤人。
A. 固定
B. 夹牢
C. 设防护装置
D. 远离作业人员
【单选题】
钢筋切断机切短料时,手和切刀之间的距离应保持在150mm以上,如手握端小于___时,应采用套管或夹具。
A. 150mm
B. 200mm
C. 400mm
D. 500mm
【单选题】
木工机械应安装___开关。
A. 按扭
B. 倒顺
C. 闸刀
D. 负荷
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