膺架拼装高位落梁法在大跨度钢桁梁架设施工中的应用

通过介绍卫运河钢桁梁架设施工方法,详细的介绍了卫运河特大桥利用膺架拼装高位落梁法架设大跨度钢桁梁的施工技术,总结出大跨度钢桁梁架设施工经验。     

铁路钢桁梁顶推架设方案及工程造价分析

铁路钢桁梁跨度大、刚性强、耐久性好,在我国应用广泛。铁路钢桁梁顶推架设作为钢桁梁架设的新方法,在钢桁梁架设施工中运用前景广阔。本文详细介绍刚桁梁顶推架设施工方案及造价分析,以资类似工程参考借鉴。     

大跨度悬索桥钢桁梁架设方法对比分析

结合金安金沙江大桥架设条件及钢桁梁结构特点,介绍山区钢桁梁架设的两种主要施工方法,即桥面吊机架设法和缆索吊架设法。通过对两种架设方法的对比分析,提出适合本工程的架设方法。     

超高位大跨度128m钢桁梁拼装及横移施工技术

以具体工程为背景,介绍并探讨了超高位跨既有线架设钢桁梁的临时支墩体系施工、滑道梁安装、钢桁梁高空拼装施工技术、钢桁梁横移施工技术、落梁施工技术以及超高位大跨度钢桁梁施工监测技术,以供参考。     

连续钢桁梁双悬臂对称架设快速施工的施工技术研究

基于银川机场黄河特大桥工程背景,针对钢桁梁快速、高效完成施工,确定了合理的施工方法和架设工艺。分别从临时支墩、初始节间及双悬臂对称架设的施工出发,对施工的各个步骤进行了详细的论述。同时对施工步骤进行阐述,详细介绍了架设、调落梁的施工工艺。该施工方法有效的大大缩短了工期,实现的钢桁梁快速施工的目标,为今后同类型工程施工提供了宝贵的经验。     

大跨度钢桁梁-拱组合结构拱肋架设关键技术

为解决大跨度钢桁梁-拱组合结构中拱肋架设存在的问题,本文以清水坪乌江大桥大跨度钢桁梁-拱组合结构拱肋的架设为例,通过介绍钢桁梁-拱组合结构特点,分析了拱肋架设关键施工技术、总体思路,提出通过控制柔性拱在架设、提升、合龙过程中结构体系转换,可以实现大跨度钢桁梁-拱组合结构拱肋架设的可行性和稳定性的观点。     

青阜二线64m大跨度钢桁梁架设成功

不久前,青阜铁路增建二线工程涡河大桥64m单线下承式道碴桥面钢桁梁架设到位。该64m大跨度钢桁梁是一种新型钢桁梁,钢结构部分自重达425t,属全国首例,技术要求高,从拼装到移位,都是一个严峻的考验。钢桁梁架设采用浮托拖拉到位的施工方法。     

杭瑞洞庭大桥钢桁梁架设施工技术要点分析

杭瑞洞庭大桥为双塔双跨钢桁架梁悬索桥,其主缆跨径布置为460m+1480m+491m,主梁跨径布置为1480m+453.6m,主梁结构为板桁结合钢桁加劲梁结构,其钢桁梁架设工程量大,施工现场环境十分复杂。本文基于杭瑞洞庭大桥钢桁梁架设施工实践(以岳阳侧为例),分析了钢桁梁架设施工工艺,总结了大桥钢桁梁架设施工要点,能为以后类似工程施工提供借鉴。     

公铁双层四线桥连续钢桁梁架设施工技术

郑州黄河特大桥北引桥为公铁双层四线桥,设计采用(73+139+73)m连续钢桁梁跨越黄河大堤.以此为例,介绍了采用全回转吊机悬臂架设钢桁梁的施工工艺.通过采用合理的施工、监控方案和精度控制措施,最终的钢桁梁成桥内力状态及变形情况符合设计要求,确保了连续钢桁梁架设施工的顺利完成.     

浅谈如何通过有效力学分析做好钢梁桥保护工作

阐述了在128 m简支钢桁梁上利用TJ165型架桥机架设简支T梁施工过程中,对钢桁梁的安全性、稳定性进行验算,制定钢桁梁加固方案,成功解决了钢桁梁在架梁过程中的安全隐患。     

橡胶膜密封气柜侧壁与顶盖同步安装法

橡胶膜密封气柜由于自身的结构特点,其施工方法与稀油密封气柜的施工方法有很大的区别,施工的重点和难点是侧壁和顶盖。目前常用的两种施工方法都是安装完侧壁后再提升安装顶盖。这种方法不仅费工费时、难度大,而且安装精度难以保证。还有一种方法虽然是侧壁与顶盖同步施工,但仍然还有不少缺点。新的施工方法是利用鸟形钩和手拉葫芦,同时将气柜的顶盖用作施工安装平台,实施侧壁和顶盖同步施工。这种安装方法不仅简单可靠,省时省力,而且有利于整个气柜安装质量的提高。     

地铁高架预制节段拼装梁的施工

介绍了节段拼装梁施工工艺,详细阐述了三种节梁段拼装架设方法,包括上行式整孔拼装架设法、下行式整孔拼装架设法和平衡悬臂拼装架设法三种方法,以推广地铁高架预制节段拼装法的应用。     

插装法安装转炉技术

插装法安装转炉是不同于一般承运台架拖运或水平液压推移的安装方法,是在钢结构厂房施工完成,施工空间狭窄的特定条件下的施工方法。该方法主要涉及吊点的设置、行车与卷扬机的配合、空间尺寸计算等问题。适用于旧厂房内转炉改造或增加新转炉的施工。     

Formation of the spherical reticulated mega-structure and its stabilities in construction

The spherical reticulated mega-structure, an innovative structure, is presented and studied in this paper. The formation method, form parameters and support style are first investigated. Based on the traditional construction methods of spatial structure, the feasible construction and erection method of this kind of structure is analyzed, and different erection sequences of the structure as well as the settings of temporary supports are proposed. The stabilities of the structure in the process of erection are then studied by both linear and nonlinear methods in detail. The effective settings of the temporary supports and reasonable erection sequence of the substructures are obtained, and some recommendations on erection are presented. This work will provide guidance in theory for construction and erection of this kind of structure.     

Investigations on influence of erection process on buckling of large span structures by a novel numerical method

The erection process of long-span spatial structures is significantly nonlinear which is often accompanied by variations in boundary condition and material property. Many researchers have conducted investigations on construction simulation of complex structures. But few investigate influence of erection process on buckling behavior of structures in service. A method for estimating the influence was proposed. The reliability and accuracy of this method was validated. Then three kinds of structures were analyzed to estimate influence of erection process. The results indicate that some kinds of structures are sensitive to erection process. Influence of erection process on buckling capacity should be considered appropriately.     

Investigation on aerodynamic stability of long-span suspension bridges under erection

The aerodynamic stability of long-span suspension bridge under erection, particularly at early erection stage, is more problematic than in the final state. It is influenced by the deck erection sequence and the nonlinear effects of wind-structure interactions. Considering the geometric nonlinearity of bridge structures and the nonlinear effects of wind-structure interactions, a method of nonlinear aerodynamic stability analysis is presented to predicate the aerodynamic stability limit (flutter speed) of long-span suspension bridges during erection. Taking the Yichang Bridge over the Yangtze River as example, evolutions of flutter speeds with the deck erected by different sequences are numerically generated. The sequences of pylons to midspan and the non-symmetrical deck erection are confirmed analytically to be aerodynamically favorable for the deck erection of long-span suspension bridges, particularly at early erection stages. The flutter speeds of long-span suspension bridges under erection are greatly decreased by the nonlinear effects of wind-structure interactions.     

狭小空间下小箱梁架设施工方法探讨

详细讨论了在狭小空间环境下，岷江一号大桥1号孔、2号孔小箱梁架设条件以及小箱梁架设施工过程，为岷江一号大桥的顺利架设奠定了良好的基础，并指出使用该方法既简化了架设设备又达到了架设效果，值得推广应用。     

浅谈如何把好安装工程费用结算关

针对安装工程造价在整个建设工程费用中比重越来越大的现状,介绍了安装工程的特点,分析了安装工程费用结算中存在的问题,阐述了把好安装工程费用结算关的具体方法,从而使安装工程的造价客观、如实地体现出来,维护甲乙双方的经济利益.     

体内预应力钢屋架结构的设计思路

体内预应力钢屋架是一种新的预应力钢结构形式,其设计方法有待完善.作者在该类结构成型过程内力分布和成型后承载力的参数研究工作基础上,提出了体内预应力钢屋架结构的总体设计思路,建立了关键结构参教的经验公式.     

多跨连续猫道的设计与架设--卢浦大桥水平索安装的辅助猫道

本文介绍了卢浦大桥猫道的构造和架设方法，并解决了设计和架设过程中的技术难点问题。