GMA material design and construction quality control for asphalt pavement of steel box girder: Case study of the Hong Kong–Zhuhai–Macao Bridge

To improve the quality of the Hong Kong–Zhuhai–Macao Bridge paving project,a new paving layer material,Guss-mastic asphalt(GMA),was proposed in this paper by combining the advantages of two types of cast asphalt mixtures:mastic asphalt(MA)and Guss asphalt(GA).Based on the characteristics of GMA,to simulate its actual production process,this study developed a small-simulated cooker mixing equipment.Moreover,the flow degree,60C dynamic stability,and impact toughness were proposed to be used to evaluate the construction and ease,high temperature stability,and fatigue resistance of GMA cast asphalt mixtures,respectively.Moreover,the quality control standards for GMA paving materials by indoor tests,field trial mix GMA material performance tests,and accelerated loading tests were finalized.The study showed that the developed simulated cooker yielded consistent mixing results in the same working environment as the engineering cooker device.Increasing the coarse aggregate incorporation rate,coarsening the mastic epure(ME)gradation composition,and using a smaller oil to stone ratio can reduce the flowability of the GMA materials to varying degrees.The four-point bending fatigue life and impact toughness of the different GMA materials are correlated well.A mobility of<20 s,60C dynamic stability of 400–800 times/mm,15C impact toughness of400 N⋅mm,and cooker car mixing temperature control standard of 210C–230C form an appropriate control index system for the design and production of GMA cast asphalt mixtures.Simultaneously,accelerated loading tests verified the accuracy and reliability of the quality control index system that has been used in the GMA paving project of the Hong Kong–Zhuhai–Macao Bridge deck and has achieved good application results.

Analysis on Construction Quality Control Technology of Reinforced Concrete Shear Wall Structure

In the process of continuous development of construction enterprises, new requirements have been put forward for construction projects. By strengthening the construction quality control of reinforced concrete shear wall structure, the construction level of reinforced concrete can be continuously improved, the construction quality can be guaranteed, and the construction project can be successfully completed, which is worthy of extensive application and promotion in construction enterprises, thus providing a broader development space for construction enterprises.

Construction Management and Installation Quality Control Strategy of Steel Bridges

At present,China’s bridges are mostly made of concrete,which contain a large amount of cement,sand and gravel and other materials,which can easily cause environmental pollution.At the same time,China’s total steel production continues to rank first in the world.The construction and development of steel bridges have sufficient basic support.At the same time,steel is more environmental-friendly than concrete,with higher strength,lower weight,and can reduce construction waste significantly,so the development of steel bridges has been on the rise.To optimize the application effect of steel structure bridges,it is necessary to analyze the construction management and installation quality control strategies of steel bridges for reference.

A Virtual Erection Simulation System for a Steel Structure Based on 3-D Measurement Data

he virtual erection simulation system was explained for a steel structure including ship and ocean plant blocks. The simulation system predicted the erection state to optimize any gap or overlap of blocks based on 3-D measurement data. The blocks were modified （cut） on the basis of the simulation result on the ground before erecting them by crane. The re-cutting process was not required and the blocks were erected into a mother ship speedily. Therefore, the erection time is reduced, increasing the dock turnover.

Microstructures and Mechanical Properties of a New Multi-functional 460 MPa Grade Construction Structural Steel

This article reports a new generation of Q460 multi-functional construction structural steel,which has high strength(yield strength larger than 460 MPa),excellent toughness(higher than 110 J/cm^(2) at-60 ℃),lower yield ratio(lower than 0.8),good fire resistance(yield strength at 600 ℃ larger than two-thirds of its room-temperature yield strength)and better corrosion resistance.The eff ects of finish cooling temperature(FCT)on the microstructure and properties were studied by scanning electron microscopy(SEM),transmission electron microscopy(TEM),emission electron probe micro-analysis(EPMA),electron backscattering diff raction(EBSD),tensile tester,impact tester,periodic immersion cycle acceleration test and electrochemical experiment.The results show that the strength and toughness are simultaneously improved by decreasing the FCT due to more lath-like bainite with large number of dislocations,refined martensite/austenite(M/A)with higher carbon concentration and increased high angle boundaries.In addition,the fire resistance of the newly developed Q460 steel is obviously better than the conventional one,which is mainly due to non-recrystallized lath-like bainite with high dislocation density at elevated temperature.The corrosion resistance of the new Q460 steel is also improved due to the addition of Cu and Cr.

新质生产力背景下装配式钢结构建筑标准化施工策略研究

随着新质生产力的快速发展,装配式钢结构建筑作为一种绿色、高效的建筑方式,正逐渐受到广泛关注。本文在分析了其优势与面临的挑战后,提出了新质生产力背景下装配式钢结构建筑的标准化施工策略,为相关领域的实践和研究提供参考。

深基坑支护结构设计与施工质量控制研究

在社会经济不断发展背景下,轨道交通工程项目也日渐增多。深基坑支护作为轨道交通基础工程的重要构成部分,其施工好坏会直接影响到轨道交通运行的稳定与安全。因此,需要结合实际对深基坑支护结构进行科学设计,对于整个支护施工过程也要实施严格控制,避免发生质量问题。围绕深基坑支护结构设计的主要内容,对深基坑支护施工需要注意的要点进行详细阐述。以实际工程案例为例,从前期工程勘查分析、确定支护结构形式、组织开展施工作业、强化支护施工管理等方面入手,详尽探讨深基坑支护结构设计与施工过程,以及取得的效果,为类似工程作业提供借鉴。

基于点云数据的大型复杂钢结构智能化施工方法

大型复杂钢结构施工过程中,常面临施工尺寸质量难以把控、构件提升变形监测困难和合拢段现场配切效率低等问题。三维激光扫描技术可全覆盖地、快速精准地获取复杂构部件在施工过程中的点云数据,这为解决上述问题提供了新方法。为此,该文以重庆两江新区寨子路钢拱桥为工程背景,开展基于点云数据的大型复杂钢拱桥智能化施工方法的全流程研究。基于标靶球检测算法、快速四点一致集算法、迭代最近邻算法等实现标靶球点云数据的自动检测及多站点云数据之间的自动配准;通过BIM点云化技术、kNN算法等完成目标点云数据的半自动化提取,实现拱肋尺寸的智能化检测;基于八叉树算法、区域增长算法等实现拱肋提升变形的智能检测;为缩短拱肋的合拢工期,基于BIM模型焊缝信息提取技术、主成分分析算法、Canny边界检测算法、霍夫变换算法等提出数字化预拼装算法,得到合拢段的配切量。工程应用表明,该文所提出的智能施工方法效率高、自动化程度好,研究成果可为大型复杂钢结构的施工质量和安装效率的提升提供理论和算法支撑。

高墩大跨径钢结构桥梁施工技术及质量控制要点探析

结合某跨江大型钢桁架景观桥,分析高墩大跨径钢结构桥梁施工技术及质量控制要点。从钢桥面板安装、主梁安装、紧固件及附件的安装3方面对高墩大跨径钢结构桥梁施工技术进行详细介绍,并对高墩大跨径钢结构桥梁施工质量控制要点进行探讨。

钢结构厂房建设质量管理与优化策略研究——以某新能源汽车产业园项目为例

为解决钢结构厂房跨度大、施工作业安全风险高,所建地环境保护和文明施工要求严苛,项目建设过程中风险控制面广和管理难度大等难题。该文通过文献综述、理论研究、案例分析等方法,深入研究钢结构厂房建设中的质量管理问题,提出一系列优化策略和措施,包括强化设计阶段的质量控制、加强施工过程的监督管理、提高技术人员素质和加强培训等。合理的质量管理与优化策略可以提高钢结构厂房建设的质量水平,增强工程的安全性和可靠性。

钢混组合结构梁柱节点施工工艺与质量控制

研究了钢混组合结构梁柱施工节点施工工艺与质量控制措施,在掌握结构特点与节点结构类型的基础上,从焊接钢筋、穿孔钢筋结构、套筒连接、钢梁搭接钢筋等多个方面,分析了钢混组合结构梁柱节点的主要施工工艺,同时,提出了原材料、施工调查、型钢件的安装、钢筋绑扎、牛腿板加工等方面的施工质量控制措施。

大跨度斜拉桥锚固构造焊接技术研究

新市金沙江大桥主塔上采用钢锚梁和钢牛腿结构锚固斜拉索,钢梁上采用钢锚箱结构焊接在上弦杆上,由于受力大,锚固构造部位多为厚板焊接,熔透焊缝多,焊接填充量大,局部操作空间狭小,施工操作、焊接变形控制难度较大。通过对钢锚梁、钢牛腿及钢桁梁锚箱构造组装施焊顺序及焊接变形控制进行分析研究,采取相应的控制措施,制定合理的焊接工艺,保证新市金沙江大桥锚固构造的焊接质量和制造精度。

BIM技术在钢结构工程施工中的应用探讨

总结了钢结构工程施工的难点与常见问题,详细介绍了BIM技术在可视化、信息共享、方案调整等方面的特点,探讨BIM技术在钢结构工程施工中的应用,分析了BIM技术在钢结构工程施工中的优势与局限,旨在解决施工中的难点问题,提高施工效率和质量。

外包钢壳混凝土异形索塔及其施工临时支撑研究

斜拉桥外包钢壳混凝土异形索塔结构受力复杂,在施工阶段存在变形和应力过大等问题。为保障该类索塔的施工安全和线形标准,设计了三种支撑方案以减小索塔的应力和变形,并利用有限元法对不同支撑方案的技术性能进行分析。分析结果表明,异形索塔的拱形轴线对塔柱应力和变形影响很大,不同建模方法计算的索塔应力和变形差异较大;三种方案的支撑均可显著减小索塔变形和腔内混凝土拉应力,而四道双管方案对降低施工难度和误差最有效;塔柱变形及混凝土拉应力对风压很敏感,施工时应加强塔柱抗风措施设计。

结合几何控制的预应力混凝土连续钢构梁公路桥施工技术

针对预应力混凝土连续钢构梁公路桥建设中施工质量控制的问题,研究提出了一种结合几何控制的施工技术。使用有限元软件对桥梁进行三维建模,通过对施工参数的跟踪和几何控制,实现对施工质量的把控,解决了桥梁施工时缺少有效质量控制手段的问题,实现了对桥梁施工过程的全程控制。

站房大跨度屋盖钢桁架拼装施工技术研究

大跨度屋盖钢桁架拼装施工具有较高的施工难度,难以把控施工质量,为此提出站房大跨度屋盖钢桁架拼装施工技术研究。根据相关规范对钢桁架外观及力学性能进行检验,采用两点吊装方式对屋盖钢桁架进行整体提升吊装施工,应用导向器件对吊装过程中对钢桁架位置进行微调,并监测提升架及钢柱。采用二哈夫组装连接,在站房大跨度屋盖钢桁架外框柱四周布设钢柱焊接工具式操作平台,进行钢桁架焊接施工,完成站房大跨度屋盖钢桁架拼装施工。实例分析结果表明,对钢桁架拼装施工质量控制后,钢桁架跨中垂直度和侧向弯曲矢高偏差均在允许范围内,符合规范要求,该施工技术能够有效控制站房大跨度屋盖钢桁架拼装施工质量,具有良好的应用前景。

现浇钢筋混凝土框架结构节点施工质量控制分析

随着社会经济的不断发展,我国建筑工程数量逐渐增多,框架结构作为建筑工程的重要部分,对于保障建筑质量具有重要意义。而在现浇钢筋混凝土框架结构中,节点属于施工重要位置,能够起到承受板、柱、梁的作用,节点施工质量对于整体结构的稳定性、安全性和耐久性具有重要影响。然而,由于多种因素的影响,节点施工质量控制存在一定的难度。基于此,本文主要结合具体工程案例,分析现浇钢筋混凝土框架结构在节点施工质量控制方面的不足与控制要点,以期保证梁柱节点的施工质量,促进建筑行业的长久以及稳定发展。

型钢混凝土组合结构梁板柱施工质量控制要点分析

型钢混凝土组合结构梁板柱是一种目前应用广泛的新型建筑结构,具有高刚度、高强度和抗震性能好等优点。但施工中也会存在一些质量问题,如型钢混凝土梁板柱的连接、型钢混凝土界面黏结等,型钢混凝土梁板柱施工质量控制对结构性能和整体稳定性具有较大影响。通过对型钢混凝土组合结构梁板柱的施工质量控制要点的分析,从型钢与混凝土界面的黏结性能、型钢混凝土梁板柱连接的方式等方面进行了论述,为型钢混凝土组合结构梁板柱的施工质量控制提供了一定的理论参考。

大跨度梁拱组合钢结构桥梁施工技术研究

大跨度梁拱组合钢结构技术工艺成熟,且易于实现,能满足钢结构桥梁项目建设要求。为实现桥梁工程的安全性、经济性,文章对大跨度梁拱组合钢结构桥梁施工技术进行了研究,从钢梁分段优化、钢箱梁施工、支撑系统施工、吊装施工等环节阐述了该技术施工要点,结合大跨度梁拱组合钢结构桥梁施工问题,提出了施工期间的技术保障策略,旨在提高桥梁结构施工质量,建设高质量精品工程。

Tekla Structures软件在油气田地面工程加工设计中的应用

为提高油气田地面工程建设质量和效率,工程详细设计完成后进行加工设计十分必要。文章结合中石化胜利油建工程有限公司在伊朗和加纳的油气田地面工程项目,详细介绍了应用Tekla Structures软件进行钢结构加工设计的优越性和具体做法。该软件能快捷、准确地创建结构3D模型,且自动生成所需的图纸和各种精确报表,便于发现加工设计中的问题从而进一步优化设计,对节约工程成本和缩短工期具有重要意义。