共查询到19条相似文献,搜索用时 93 毫秒
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针对某国产盾构机4.8 m主轴承在轴向载荷与倾覆力矩联合作用产生的偏载荷下的安全性进行了研究.根据设计极限作用下的偏载荷与结构设计参数,计算了主推滚子和辅推滚子所受的最大接触载荷与接触应力以及主推和辅推滚子、主推和辅推滚道的安全系数.结果表明:所有的安全系数均符合安全使用要求,但主推滚道和主推滚子的安全系数相对较小,在... 相似文献
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土压平衡盾构机刀盘刀具布置方法研究 总被引:5,自引:0,他引:5
研究土压平衡(Earth pressure balanced,EPB)盾构机刀盘刀具的布置方法,目的是为了确保刀具结构布置的合理性和实用性。依据刀具磨损的等寿命原则,提出确定刀具数量的磨损系数法和掘进系数法;针对具体施工问题,可预测盾构在开挖区间,刀具的磨损量以及许用磨损情况下刀具的掘进距离,为保障工程的安全顺利进行提供参考。基于阿基米德螺旋线布置方法,计算以刀具磨损的等寿命原则下,主切削刀的布置曲线;提出刀具平面对称布局原则,分析刀具的切削过程,得到单把刀具的实际切深;建立EPB盾构刀盘上先行刀的立体布局方法,计算得到先行刀的超前量;结合南京地铁二号线TA07标段,验证了刀具布置方法的正确性。研究内容和研究方法可为EPB盾构机刀盘的选型和设计奠定理论基础。 相似文献
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在土压平衡盾构机制造过程中,对于刀盘、盾体等核心零部件,其结构复杂,制造难度大;整机零件种类多,组装复杂程度高。在分析总结整个制造工艺流程难点的基础上,成功开发出了一套完整的土压平衡盾构机制造工艺,对土压平衡盾构机制造工艺标准化及工艺进一步改进提供了依据。 相似文献
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采用有限元法对土压平衡盾构机的关键部件刀盘牛腿进行静力学分析,同时计算其在受力条件下的前6阶模态的固有频率、振型、相对位移的分布图。分析结果显示出受力薄弱区以及抗震薄弱区,为刀盘牛腿的静力学以及动力学优化提供必要的依据。 相似文献
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盾构掘进机异形断面隧道切削机构的奇异性分析 总被引:1,自引:0,他引:1
首次选择五杆机构作为盾构掘进机(TBM)异形断面隧道切削机构,较全面地分析了切削机构的奇异性条件,并指出了切削机构的瞬时运动不确定位置,为今后实际工程应用时,提供了理论上的指导. 相似文献
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隧道掘进机大数据研究进展:数据挖掘助推隧道挖掘 总被引:1,自引:0,他引:1
随着传感与智能化技术不断发展,隧道掘进机的运行监测日趋完善,所记录的海量实测数据不仅包含了装备作业过程的重要信息,也蕴含了装备内部及其与外部环境的相互作用机理,通过一定方法对这些数据进行深度挖掘与分析对于提升装备设计、分析、运行与维护水平具有十分重要的意义。为总结和分析隧道掘进机实测数据研究方法与应用状况,首先概述隧道掘进机实测数据的来源、构成与特点,从数据驱动的装备状态识别与性能预测、地质识别与地表改变预测、隧道健康监测与预警三个方面综述国内外相关文献,总结和归纳当前研究的难点、优点与不足,最后从隧道掘进机实测数据预处理方法、多源异构数据建模方法、模型泛化能力提升方法、数据计算平台等方面对未来研究方向进行初步分析与展望,为后续隧道掘进机大数据研究提供参考与借鉴。 相似文献
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Wear is a major factor of disc cutters’ failure. No current theory offers a standard for the prediction of disc cutter wear yet. In the field the wear prediction method commonly used is based on the excavation length of tunnel boring machine(TBM) to predict the disc cutter wear and its wear law, considering the location number of each disc cutter on the cutterhead(radius for installation); in theory, there is a prediction method of using arc wear coefficient. However, the preceding two methods have their own errors, with their accuracy being 40% or so and largely relying on the technicians’ experience. Therefore, radial wear coefficient, axial wear coefficient and trajectory wear coefficient are defined on the basis of the operating characteristics of TBM. With reference to the installation and characteristics of disc cutters, those coefficients are modified according to penetration, which gives rise to the presentation of comprehensive axial wear coefficient, comprehensive radial wear coefficient and comprehensive trajectory wear coefficient. Calculation and determination of wear coefficients are made with consideration of data from a segment of TBM project(excavation length 173 m). The resulting wear coefficient values, after modification, are adopted to predict the disc cutter wear in the follow-up segment of the TBM project(excavation length of 5621 m). The prediction results show that the disc cutter wear predicted with comprehensive radial wear coefficient and comprehensive trajectory wear coefficient are not only accurate(accuracy 16.12%) but also highly congruous, whereas there is a larger deviation in the prediction with comprehensive axial wear coefficient(accuracy 41%, which is in agreement with the prediction of disc cutters’ life in the field). This paper puts forth a new method concerning prediction of life span and wear of TBM disc cutters as well as timing for replacing disc cutters. 相似文献
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