平潭海峡公铁两用大桥大跨度简支钢桁梁架设的监理控制

平潭海峡公铁两用大桥三标深水高墩区共有26孔跨度80m和8孔跨度88m的简支钢桁梁。钢梁为全焊接结构,在工厂一次焊接成型,通过船舶运输至待架墩位进行整体吊装架设。大桥处复杂海域,施工环境恶劣,大跨度简支钢桁梁整体吊装工艺先进、工序衔接紧、安装精度要求高、高空作业安全风险高,施工过程控制点多。监理通过对船舶准备就位、简支钢桁梁整体吊装架设、平面位置精调、支座安装及灌浆等四个主要工序的质量控制,和对物的不安全状态、人的不安全行为、安全管理制度的安全监理控制,确保了工程施工质量安全有序可控。     

同三特大桥64m下承式钢桁梁施工技术

介绍了同三特大桥64m下承式钢桁梁拼装和拖拉架设施工方法，拖拉架设过程中膺架、杆件内力、悬臂挠度检算。     

提速对44m半穿式钢桁梁桥动力影响分析

本文按车作用动力体系分析了客车车速提高后对４４ｍ半穿式钢桁梁动力影响，并对提高车速后的行车质量做出评价。     

反比函数极值几何意义在钢桥节点板套料优化中的应用

正一、引言现代铁路钢桥对跨度大、三桁、多线和公铁两用等特点日益重视,而整体节点钢桁梁是适合这类大载荷的主要桥型。整体节点相对于散拼节点有两个突出的优点,一是承受载荷大,节省全桥钢材用量,减少建设成本;二是施工效率高,缩短桥位施工工期。但整体节点相对于工厂而言,属于异形结构,其材料套料料耗显著增大,相对于散拼节点而言反而是增加了工厂制造成本。材料料耗占据了工厂制造成本的绝大部分,其中整体节点大节点板板厚一     

Train-induced vibration on elevated railway station

Results of in-situ vibration measurement carried out at Tianjin West Elevated Railway Station which has the trains running on the station structure were reported. The main excitation source is the train passing through the station. Vibration measurements were recorded in the vertical direction of the supporting track beam, the platform and the steel truss beam of the waiting hall, as well as in the vertical, longitudinal and transverse directions of the roof arch base of the station. Acceleration time responses were obtained. The maximum value, vibration level and one-third octave band RMS spectra of the measured accelerations were studied. The propagation of vibration in different structural floors was discussed. The influence of train speed, distance to the vibration source and the type of train on the structural vibration were analyzed. Results show that the vibration level increases with the train speed, while it attenuates with the distance to the track. Furthermore, the vibration responses of different structural floors were compared, and it is noted that the vertical vibration of the bottom slab of the platform is most severe and the transverse vibration of the roof arch base is the smallest. The results provide reference on the vibration characteristics and vibration energy distribution of this type of ＂Train on building frame＂ system used as an elevated railway station.     

合肥南环铁路某钢桁梁大桥测量监测控制

详细介绍新建合肥铁路枢纽工程南环线某钢桁梁大桥测量监控控制网的布设及施测。利用GPS对原有控制点进行复核、加密,再用全站仪进行校核,保证测量监控质量。     

山河智能旋挖钻机助力世界第二悬索桥

正近日,位于洞庭湖入长江交汇口处岳阳市七里山处,目前世界第2、国内第1的大跨径钢桁梁悬索桥——大岳高速公路洞庭湖大桥正在热火朝天的建设当中。其中负责承建A2标段——大岳高速洞庭湖大桥君山段建设的中交路桥建设有限公司凭借SWDM42型旋挖钻机的强力助推,施工质量和速度得到了充分的保证。大岳高速洞庭湖大桥是杭瑞国家高速公路临湘至岳阳段     

铁路大跨径钢桁梁步履式顶推施工技术的探讨

漠阳江特大桥134m钢桁梁是目前国内铁路跨径最大的双线有砟简支钢桁梁,由于跨径较大,且漠阳江为四级航道,使用步履式顶推施工工艺避免了航道对施工的影响,且拼装场地较为固定,提高了设备利用率,缩短了工期,提高了施工安全系数。     

沙坪河大桥钢桁梁施工安装方案

本文章主要讲解了64米钢桁梁施工过程中的工艺、流程及重难点控制，为今后同类型桥梁施工提供一些可借鉴的经验。