大跨度箱梁桥悬浇挂篮施工技术研究

为了提高大跨度箱梁桥施工的安全性,以国道205线南平市曲港大桥为例,对挂篮施工预压、0#块及合龙施工、钢筋、模板、混凝土工程等方面进行探讨研究,分析各环节中的重点与难点及保证措施,梳理出预应力连续梁桥悬臂挂篮施工技术体系,以期为同类型施工提供参考。     

公路大桥上部箱梁滑移模架施工

介绍了滨州徒骇河大桥上部连续箱梁滑移模架施工,结合工程实际阐述了移动支撑系统的功能、原理、工艺流程及施工过程中控制要点。     

钢护筒处理岩溶地区大型溶洞桩基施工探讨

文章结合贵州省六威高速公路第LWTJ-11合同段箐沟大桥K69+690左12-2#、右12-1#桩基溶洞处理工程实例,探究钢护筒在岩溶地区桩基施工中的应用。钢护筒在岩溶发育、地下暗河、地质条件复杂的桩基施工过程中可有效降低施工安全风险,提高成桩基施工质量,节约施工成本,加快桩基施工进度。     

受限空间条件下大吨位桥梁安装技术探讨

由临时墩、轨道梁及重型桁车等组拼成的T梁安装系统,安全、方便、快捷地实现了下穿贵广高铁的三江至柳州高速公路的泗里口寻江大桥左线1#、2#跨的40m T梁吊装。文章结合该工程实例,介绍了采用跨墩桁车解决作业空间受限条件下的大吨位T梁安装施工要点和注意事项。     

高墩大跨刚构桥0#块托架设计与施工技术

依托铜旬高速公路中吕村大桥工程实例,针对0#块120 m高空作业的特点,对高墩托架施工设计方案进行了必选,提出了"锚固三角架法"托架施工和设计方案;通过有限元建模对0#块托架进行了受力分析,并对其结构关键部位给出了分析验算,在此基础上提出相应施工控制措施。     

预制箱梁钢筋安装系统技术应用

文章依托平石江大桥、茅墩大桥预制梁钢筋安装工程,针对箱梁预制施工过程中存在的问题,提出预制箱梁钢筋安装系统技术,介绍了该技术的特点及系统组成,并评述了该技术应用的优势。     

隆纳铁路沱江特大桥水中基础施工

隆纳铁路沱江特大桥全长581．03m，主桥为一联(48 80 48)m预应力混凝土连续箱梁，5#、6#水中墩为大桥主墩，本文介绍了5#墩和6#墩水中基础施工方案的选择，并介绍了5#墩基础采用的万能杆件格架编织袋围堰施工及6#墩采用的双壁钢围堰环形封底施工。     

浅析悬浇梁0#块托架反力预压技术的应用

本文以福寿高速公路西浦大桥工程为实例,对悬浇梁0#块托架采用反力预压的施工技术进行了研究和应用,经过实践证明该技术安全可靠、操作性强,有效缩短预压周期,降低施工成本,具有较好经济效益和应用前景。     

叠合梁施工在桥梁工程中的技术要点分析

本文结合遵余湘江大桥工程建设实例,从0#、1#、2#梁段施工、桥面架梁吊机的安拆、标准梁段施工、中跨合拢段施工、压重梁段施工、桥面板施工以及预应力施工等方面对叠合梁施工在桥梁工程中的技术要点进行了归纳和分析。     

池州长江公路大桥北边跨现浇箱梁施工关键技术

文章以池州长江公路大桥工程为依托,分析了混凝土现浇箱梁施工关键技术,从钢管桩少支点支架系统、混凝土配合比、模板系统、索导管定位及混凝土浇筑等方面,介绍了现浇箱梁设计与施工优化方法。     

大吨位汽车吊少支架安装钢管拱施工技术探讨

汽车吊安装以其施工工艺简单、施工快速、费用低等优点广泛应用于梁拱组合桥的钢管拱安装施工中。文章结合百色市百林大桥工程实例,介绍大吨位汽车吊少支架安装钢管拱施工技术,为今后类似工程提供借鉴。     

索吊式扫床设备在航道疏浚工程中的应用

文章通过对索吊式扫床设备和普通扫床架的对比,分析了素吊式扫床设备的优点,并结合龙圩水道水下炸礁补钻爆破工程实例,介绍了索吊式扫床设备在水下炸礁补钻爆破中的应用原理、方法及使用范围,阐述了其在航道疏浚检测工程中的实用性、安全性与准确性。     

大型贝雷主梁龙门吊的结构设计与拼装

针对飞龙岛大桥钢箱梁的长距离吊运与安装实际,文章设计出承重标准值200 t的贝雷主梁钢管支腿龙门吊,并通过有限元模拟分析及稳定性验算,对龙门吊主体结构杆系的反力、应力、挠度及稳定性进行分析。同时,文章阐述了龙门吊主体结构的拼装工艺,为大吨位贝雷片主梁龙门吊设计与拼装提供了依据。     

贝雷片拼装水上浮式门吊的设计与施工探讨

文章结合厄瓜多尔巴巴奥约河大桥工程实例,介绍一种由浮船、贝雷桁架组装的大型水上浮式门吊起重设备的设计和施工技术要点,为类似桥梁工程提供参考。     

轨道龙门吊安装大吨位钢箱梁施工工艺

文章结合飞龙大桥钢箱梁安装施工实例,介绍了轨道龙门吊安装钢箱梁的工艺原理和流程,提出了工艺操作的要点及质量控制方法,并通过工程实践验证了该工艺的技术经济优势。     

A comparison of different container sorting systems in modern rail-rail transshipment yards

Rail-rail transshipment yards act as central hub nodes within a railway network and enable a rapid consolidation of containers between different freight trains. To avoid an excessive movement of gantry cranes when transferring a container from one train to another, modern yards apply sorting systems where shuttle cars move containers horizontally along the spread of the yard. This paper compares four elementary sorting systems. Specifically, we compare rubber-tired and rail-mounted shuttles and differentiate whether a pure shuttle system or a lift & shuttle system is applied. In pure shuttle systems, a shuttle receives a container from a crane and transports it towards the destination crane, where it serves as a storage device until being unloaded. A lift & shuttle system applies shuttles with an integrated lifting platform, so that they are able to autonomously store and receive containers from a separate storage rack. Both alternatives exist in rubber-tired and rail-mounted versions. As the shuttles are the main driver of the investment costs, we compare the required fleet size for timely supplying given gantry crane schedules within all four systems. For this purpose, we derive suited scheduling procedures. This way, decision support for yard managers having to identify a suited sorting system and to layout a new terminal is provided.     

两种港口起重机轨道固定系统的比较研究

轨道固定系统是起重机平稳安全运行的基础,文章从轨道的受力分析出发,比较说明有缝轨道鱼尾板硬式固定系统和无缝轨道柔性固定系统的优缺点。     

Cranes scheduling in frame bridges based automated container terminals

This paper investigates crane scheduling problems for a new type of automated container terminal system, which is based on multi-storey frame bridges. For the new design concept, this paper studies how to schedule two types of cranes, i.e., quay cranes and bridge cranes that transfer containers between different storeys. The schedules of these two types of cranes impact the operation efficiency of the terminal system. Mathematical models are proposed for the two scheduling problems. Meta-heuristics are developed to solve them. Numerical experiments are conducted to validate the effectiveness of the proposed models and the efficiency of the proposed solution method.     

Gantry crane operations to transfer containers between trains: A simulation study of a Spanish terminal

Freight transfer operations are critical in combined transport networks. In this paper a simulation model and modelling approach to the transfer of cargo between trains at rail terminals is presented. The model is used to study the Port-Bou terminal, the main intermodal terminal at the Spanish-French frontier. Four different gantry crane operation modes to interchange containers between trains are evaluated. These operation rules are tested in several scenarios to examine the critical factors of the system and the best operation rule for each situation. Latest generation software is used to develop the model that incorporates modular programming and enhanced graphic systems for output representation. It allows a dynamic display of the simulated system and, likewise, the possibility of developing modules that can be reused in other studies. The research shows how simulation can be a useful planning tool in the rail transportation context.     

防城港20万吨级矿石码头大圆筒浮游稳定分析

防城港20万吨级矿石码头圆筒直径20m,高21·7m,是讫今世界上最大的坐床式圆筒码头结构。文章针对防城港作业没有大型起重船设备原因,介绍采用在圆筒底部加设临时底板的海上浮运安装方案,该方案通过螺栓与圆筒内趾连接,并设置止水形成封闭底板,施工期用以承受浮托力,圆筒安装就位后松脱螺母,使其不参与使用期受力,维持原结构受力模式的效果,同时可以节约可观的大型起重船调遣安装费,供同类工程参考。