CRTSⅢ型轨道板快速封锚砂浆施工技术

封锚砂浆的质量直接决定了CRTSⅢ型轨道板的质量,而快速封锚砂浆是一种新型的封锚材料,在CRTSⅢ型轨道板中采用快速封锚砂浆,能有效改善CRTSⅢ型轨道板的质量,进而为CRTSⅢ型无砟轨道的运行提供安全保障。     

浅析无砟轨道轨道板铺设CA砂浆灌注施工工艺

总体论述了CRTSI型无砟轨道轨道板铺设CA砂浆选定和配制及CA砂浆灌注等施工工艺，并结合设计及相关技术资料仔细分析和总结了CA砂浆灌注整个过程和注意事项，以指导实践。     

高速铁路CRTS Ⅰ型轨道板快速封锚技术研究

针对高速铁路CRTS I型轨道板传统封锚工艺效率低、工序繁琐、质量差、易脱落等问题,提出了一种全新的快速封锚施工技术.该工艺具有封锚材料生产工厂化和封锚施工操作标准化的特点,采用半机械化施工,可将轨道板封锚施工时间缩短为传统工艺的1/6,且能确保封锚质量,满足轨道板快速生产工艺要求.工程应用情况表明,该技术能大幅提高轨道板封锚施工效率,缩短轨道板生产周期,保证轨道板封锚施工的标准化.     

高速铁路板式无砟轨道用CA砂浆搅拌车

通过对高速铁路板式无砟轨道用水泥乳化沥青砂浆(简称CA砂浆)材料技术及搅拌装备的研究,开发了CA砂浆的专用搅拌车.     

高速铁路板式无砟轨道用CA砂浆搅拌车

通过对高速铁路板式无砟轨道用水泥乳化沥青砂浆(简称CA砂浆)材料技术及搅拌装备的研究,开发了CA砂浆的专用搅拌车。     

板式无砟轨道板铺设施工技术

无砟轨道施工质量在铁路客运专线建设中具有重要意义,本文结合哈大铁路客运专线CRTSⅠ型板式无砟轨道现场施工情况,对轨道板铺设施工工艺和施工方法进行总结,指出CRTSI型无砟轨道铺设技术要点。     

高速铁路CRTSⅠ型无砟轨道板施工技术

作为一种新型的高速铁路建筑材料,CRTS-Ⅰ型无砟轨道板具有结构截面尺寸小、自重轻、机械化程度高、易于辅装、便于维护、产品通用性好、造价较低等特点.在哈大高速铁路上获得成功运用,能确保轨道板铺设质量、精度和耐久性,为高速铁路的舒适性和平顺性提供了保证.     

水泥乳化沥青砂浆与无砟轨道

板式无碴轨道是由长钢轨、扣件系统、轨道板、水泥乳化沥青砂浆、混凝土底座及凸形挡台组成的一种新型轨道结构.为了使板式轨道具有一定的弹性,并固定轨道结构的位置,在混凝土底座和轨道板之间,以及凸形挡台周围填充缓冲材料层,同时消除混凝土构件施工误差.     

无砟轨道板制造技术

结合中铁二十局集团石武项目部CRTSⅡ型轨道板生产的实际情况,总结轨道板建厂规划的原则、要点,重点介绍CRTSⅡ型轨道板的生产工艺及注意事项,为CRTSⅡ型轨道板的建厂和生产提供参考。     

板式无砟轨道CA砂浆层维修技术

板式无砟轨道是我国目前高速铁路所采用的主要结构形式之一,已在国内多条高速铁路上广泛使用。作为轨道板和底座板之间的CA砂浆层,其主要作用就是将轨道板传递过来的列车荷载均匀分散后,传递到底座板上,起到缓冲、承载、分散和传递的作用。但是在CA砂浆灌注过程中,由于一些不可避免的因素,比如操作过程或者作业时间控制不当,以及气温变化过大、风因素,造成CA砂浆层与轨道板和底座板之间出现离缝的情况,并随着列车荷载和温度力的反复作用下,CA砂浆层会出现离缝程度增大,最后破碎的情况,对列车行车安全造成很大威胁,文章以武广、成渝、石太等高速铁路为载体,通过对板式无砟轨道CA砂浆现场维修作业总结而成,对以后该类型作业能提供一定的参考。     

无砟轨道长轨铺设施工技术

从理论和实践上对无砟轨道的施工技术进行了初步探讨,对无砟轨道长轨铺设中的铺轨基地建设、长轨铺设技术等进行阐述,阐明了无砟轨道长轨铺设时各个环节的施工技术,重点对基地布置、长钢轨装卸及运输作了详细的论述,进一步探讨长轨铺设中使用的铺设技术。     

Identification of ballast grading for rail track

Grading has long been recognised to critically influence the mechanical behaviour of ballast.To identify the ballast grading for heavy-haul rail track,monotonic and cyclic triaxial tests are conducted to assess the performances of different gradings.Permanent deformations,aggregates degradation,resilience,shear resistance,maximum and minimum densities are recorded and analysed.The grading is found to affect the behaviour of ballast in that coarser gradings exhibit relatively better strength,resilience and therefore less permanent deformation.However,ballast degradation increases with the overall aggregate size.Therefore,to identify the grading for ballast with different performance objectives,a grey relational theory is used to convert the multi-objective into single-objective,i.e.grey relational grade.A relatively optimal grading that provides the highest grey relational grade is thus suggested for the improved ballast performance.     

后张预应力结构管道压浆密实度的控制

介绍了后张预应力结构孔道压浆的重要作用，结合孔道压浆不密实的症状表现，从设计和施工方面，分析了造成孔道不密实的原因，提出了相应的防治措施。     

Fracture toughness estimation of ballast stone used in Iranian railway

Ballast is a layer composed of crushed stone basically with diameters of 20-60 mm,on which sleepers and rails are set.Ballast is used to withstand vertical,horizontal and lateral forces applied on sleepers and to hold the line in operative conditions.Ballast deterioration induced by crashed stones is a major issue of track instability as the ballast layer quality depending on the materials used and their densities should be focused on.Therefore,ballast should be resistant against loads applied,and the fracture toughness of ballast stone is of great importance.For this purpose,the fracture toughness of two kinds of ballast stones used in Iranian railway,i.e.Gaduk(limestone) and Anjylavnd(andesite),is investigated experimentally in this paper.The quality of ballast stone is evaluated in different weather conditions.Numerical results shown that the Anjylavnd stone is more appropriate for rainy and cold weather when there is a probability of fracturing due to frozen water captured in ballast.     

水泥基自流平砂浆的配制

本文从保证水泥基自流平砂浆的流动度、砂浆的强度出发,通过调整减水剂、消泡剂、可再分散乳胶粉、纤维素醚的掺入量,调整胶凝材料、骨料、矿物填料等组成材料的比例,研究它们对砂浆性能的影响,经过试验调整得到优化配比。     

Study of the flow between the train underbody and the ballast track

The purpose of this work is to study the flow between the underbody of a high speed train and the ground, which consists of both ballast and sleepers. The flow is approximated by a turbulent Couette flow. An analytical solution of the turbulent Couette flow is proposed. Comparisons of the analytical results against wind tunnel and on track tests experiments and results of other classical models for turbulent Couette flows are made in order to validate the obtained solution. The analytical velocity profile is also compared with the corresponding one calculated with the commercial code Fluent for an idealized two-dimensional configuration.Another objective of this work is to obtain an equivalent roughness of the track made of sleepers and ballast. The results obtained enable stationary RANS simulations to be undertaken by substituting the track made of sleepers and ballast with an equivalent rough plate. This steady state analysis is not possible if the sleepers are retained. Taking into account the energy conservation, and comparing with the analytical solution, the equivalent roughness of the ballast track is obtained. The influence of the following parameters on the obtained values of the equivalent surface roughness is analyzed: height of the gap, Reynolds number and roughness of the upper wall.     

碳纤维板加固预应力空心板受力性能分析

采用MIDAS/FEA建立了预应力碳纤维板和普通碳纤维板加固后预应力空心板有限元分析模型,并考虑二次受力的影响,对其加固效果进行了对比分析,依据分析结果给出了工程中使用碳纤维板加固类似桥梁的建议。     

路基上合成轨枕有砟轨道动力学特性研究

基于有限单元法与多体动力学理论,根据合成轨枕在有砟轨道上实际应用情况建立车辆—轨道耦合动力学模型,对时速200 km/h工况下路基上合成轨枕有砟轨道结构进行动力学计算分析,重点研究合成轨枕密度变化对轨道结构力学特性的影响规律。研究结果表明:当合成轨枕密度增大时,钢轨的垂向位移变化不明显,垂向加速度显著增大;合成轨枕的垂向位移变化较小,垂向加速度减小;车体的垂向加速度增大,横向加速度减小;脱轨系数和轮重减载率显著减小。     

外墙外保温用粘结砂浆和抹面砂浆质量控制要点

干粉砂浆质量控制可从原材料选择、生产过程控制以及施工过程控制三个方面入手。只有合理选择原材料，恰当配比，对生产过程进行严格控制，在施工过程中严格按照施工工艺操作，才能保证粘结效果。     

纤维素醚性能及在普通干粉砂浆中的应用

研究纤维素醚对砂浆保水性的影响,分析纤维素醚粘度、细度、掺加量和砂浆温度对砂浆保水率的影响规律。结果表明,纤维素醚可显著提高普通干粉砂浆的保水性,并随纤维素醚粘度的增加而提高,纤维素醚的细度、掺加量和砂浆温度对砂浆的保水性也有一定的影响。