Research on Combined Construction Technology for Cross-Subway Tunnels in Underground Spaces

Given the increasingly notable segmentation of underground space by existing subway tunnels, it is dif- ficult to effectively and adequately develop and utilize underground space in busy parts of a city. This study presents a combined construction technology that has been developed for use in underground spaces; it includes a deformation buffer layer, a special grouting technique, jump excavation by compart- ment, back-pressure portal frame technology, a reinforcement technique, and the technology of a steel portioning drum or plate. These technologies have been successfully used in practical engineering. The combined construction technology presented in this paper provides a new method of solving key techni- cal problems in underground spaces in effectively used cross-subway tunnels. As this technology has achieved significant economic and social benefits, it has valuable future applications.

Identifying critical factors that affect the application of information technology in construction management: A case study of China

The new mode for managing construction projects with information technology(IT)has attracted worldwide attention because it can help managers and workers perform tasks and bring potential benefits,such as high-quality products and accident-free production,effectively.However,the application of IT in site have not achieved expected results because it is faced with many constraints caused by internal factors from enterprises and projects and external factors from the government and environment.Although many relevant studies have discussed the constraints of implementing different IT and devices in the construction industry or site,few articles have specifically focused on identifying and analyzing the indicator system.In this work,we took China as the background,scientifically identified 23 influential factors that affect the implementation of IT in construction management through literature review and expert interviews.Subsequently,questionnaires were issued,and Delphi method was used to obtain empirical data that aimed at four different management fields.Then,an efficient and convenient method called DEMATEL was used to deal with these data.Afterward,the factors were divided into four categories,namely,core,diving,independent,and impact factors.Finally,the similarities and differences of the analysis results from the four fields were compared,and the key factors were identified.Results show that the cross-domain talent ability,concept and value cognition,and organization structure are core factors in all management fields that should be managed first along with the IT innovation ability in the enterprise.The formulation of technical standards and related device and training input are also critical in specific fields.Strategic planning plays a role in macro control and promotion.Data management and application,platform construction,solution,and collaboration have direct impacts on information management.The research results provide suggestions not only for the government to formulate effective policies for IT application and promotion in construction industry,but also for enterprises to take measures in improving management efficiency in the construction site and realizing its substantial benefits.

An Empirical Study on Project Management Maturity in Human Resources

The assessment of the Project Management Maturity （PMM） level shows the company how good it is at managing projects. This measurement can be performed in different domains of expertise. In the article, the issue of PMM in the human resources （HR） area is examined. The discussion is based on a world-wide empirical research project conducted in more than 400 companies. The study was mostly focused on the machinery industry as there is a dearth of research on project management topics in this branch of the economy. Therefore, by investigating the PMM level in the HR area, a picture of the state of project management in the machinery industry will be created. For the purposes of comparison, a study was conducted on the construction （CONS） and information technology （IT） industries which, in contradistinction, are very well recognized in the scientific literature related to project management issues. This approach will help to better contextualize and understand the results from the machinery industry. The PMM level measurement was done using the author＇s model which assesses maturity on a scale of one to five, where one is the lowest and five, the highest level of maturity. The results of the study revealed that there were differences among the industries in PMM levels and between Polish and foreign companies.

Analysis of Geotechnical Engineering Safety Technology in Urban Underground Space Construction

With the accelerating pace of urbanization,the development and application of urban underground space has attracted much attention.In the construction of urban underground space,geotechnical engineering safety is the key point for construction.Based on this,this paper analyzes the application of geotechnical engineering safety technology in urban underground space construction,in hope that this analysis can provide a scientific reference for the rational application of geotechnical engineering safety technology as well as the construction and development of urban underground space.

COMPARISON OF EMITTED EMISSIONS BETWEEN TRENCHLESS PIPE REPLACEMENT AND OPEN CUT UTILITY CONSTRUCTION

Currently,there is a worldwide trend towards reducing emissions into the environment generated by human activities.Pollutant emissions into the atmosphere are a major measure of the impact on environment.The construction indus-try is a major producer of such emissions due in part to the magnitude of operations and the vast array of equipment.Increased urbanization has resulted in a need for the installation of an expanded underground network of infrastruc-ture that includes gas,water,wastewater,pipelines,power,and communications systems.Today,engineers are faced with engaging the construction option that not only provides the best cost advantage,but also considers environmental sensitivities to create the most sustainable solution.Reduction of pollutants such as carbon dioxide(CO_(2)),carbon monoxide(CO),nitrogen oxide(NO_(X)),total organic compounds(TOC),and sulfur oxide(SO_(X))have been identified by the United States Environmental Protection Agency as critical to sustainable development.This paper describes an approach for quantifying airborne emissions that is demonstrated through a comparison of two construction methods for installing a wastewater line.It was discovered that the option involving a traditional open cut method resulted in an overall average of about 80%greater emissions compared to trenchless pipe replacement.Thefindings of this paper should assist the utility construction industry in technology selection to minimize environmental impacts.

Technical Development and Safety Risk Analysis of Urban Underground Engineering

With the rapid development of China's urban construction, the acceleration of urbanization and the rapid expansion of population, the effective development and utilization of urban underground space have attracted great attention. Therefore, it is inevitable to study the comprehensive technology of deep underground engineering, and the research results will play an important guiding role in the design and construction of middle and shallow space of underground engineering in the future. This paper analyzes several common construction techniques and methods in the current construction process of urban underground engineering, summarizes the main construction methods of underground engineering, forecasts the development of urban underground engineering construction, and analyzes the safety risks of urban underground engineering construction.

丁二烯技术进展及市场分析

介绍了丁二烯生产工艺开发进展,分析了国内丁二烯的生产消费情况,对发展趋势进行了分析及预测,并对国内丁二烯行业发展提出了几点建议。

近接运营地铁的城市地下工程施工安全韧性评估方法研究

为提出一种用于评估近接运营地铁的城市地下工程施工安全韧性的方法,首先,通过对近接施工的3个方面(新建地下工程、地层、既有地下结构)以及2个维度(技术和管理)的分析,建立一个较为完整的韧性指标体系;其次,结合层次分析法、熵权法和博弈论,提出韧性指标体系的权重组合分析方法;同时,基于集对分析理论,提出研究体系复合性能Q的连续评估方法;最后,从“最大损伤”和“累计损伤”2个角度提出韧性R的综合评估计算公式,并将其应用于具体工程案例的分析。研究结果表明:1)新提出的韧性评估方法与传统的风险评估方法可以相互印证,且新的韧性评估方法考虑因素更为全面;2)提出的系统复合性能Q包含3个维度,即既有地下结构(Q_(A))、地层(Q_(B))、新建地下工程(Q_(C)),比传统的评估理论更全面;3)随着既有地下结构的动态指标限值越来越严格,系统复合性能Q的评估结果对应有所下降。

房建工程地下结构无缝防水施工技术

为了提高房屋建筑工程的质量与施工水平,减小房建工程地下结构施工中的缝隙,提高防水效果,以山西晋中寇村整村改造项目为例,开展了房建工程地下结构无缝施工技术的研究。选择EUA-Ⅱ品牌的混凝土补偿材料开展地下收缩结构混凝土补偿施工,同时在地下施工区域的裂缝结构内,增设膨胀加强带。以竖向垂直的方式对钢筋结构进行固定,避免浇筑混凝土时出现流向偏差的问题。采用整体浇筑方式,并依据闭水试验,对细部裂缝进行填补。实践证明,该技术可降低由于温度变化导致混凝土收缩的发生概率,可达到预期防水效果。

基于复合材料建筑模板的地下综合管廊施工技术研究

针对当前地下综合管廊施工存在混凝土结构质量差、模板施工精度低等问题,基于复合材料建筑模板,开展对地下综合管廊施工技术的研究。根据地下综合管廊施工特点及要求,对复合材料建筑模板结构进行设计;采用外操作架结合盘扣式脚手架的方式,实现复合材料建筑模板水平转运;根据施工图纸,完成模板安装与拆除施工。应用实例证明,新的施工技术应用后,地下综合管廊混凝土结构质量显著提升,同时模板的结构精度也能够充分满足施工要求,促进工程整体施工水平的提高。

基于BIM的市政道路与道桥工程中应用价值分析

BIM技术在道路工程设计施工阶段应用价值随着经济的快速发展和城市化进程的加速,道路工程已经成为城市建设中不可或缺的一部分。在道路工程的设计和施工阶段,如何确保工程质量、提高效率、降低成本是道路工程管理中的一大难题。BIM技术的应用为提高道路工程质量、效率和降低成本提供了一条可行的途径。BIM技术在桥梁施工行业,传统施工方式往往存在规划效率低、沟通成本高、安全风险大等问题。而随着BIM技术在桥梁施工阶段的应用,解决了上述问题,并取得了显著的效果。本文主要探讨BIM技术在桥梁施工全过程中的应用点,以BIM技术的应用价值为切入点,分析其优势与局限性,并提出应用价值分析和未来发展方向。

BIM技术在导截流工程中的应用研究

该文研究建筑信息模型(BIM)技术在水利水电导截流工程中的应用。通过对BIM技术的理论分析和实际案例研究,探讨水利水电导截流工程中BIM技术在提高工程设计效率、优化施工方案、降低工程风险等方面的积极作用,可为相关工程实践提供参考和借鉴。

TBM施工技术在金属矿山长距离运输巷掘进的应用

金属矿山长距离运输巷采用钻爆法施工时出渣运输困难、安全管理难度大、施工进度慢,采用TBM施工能有效克服以上不利因素。以某金属矿山长距离运输巷施工为例,结合项目自身特点,确定TBM设备从辅助斜坡道运输至施工中段进行地下组装,然后开始中段运输巷道施工;TBM施工完成一个中段巷道后,再向上施工措施巷道至上部中段,施工完成后拆机经斜坡道运出至地表。采用TBM施工后巷道断面为规整的圆形,围岩未受到爆破震动影响,工作面安全状况较好。TBM施工每月进尺450~500 m,施工进度大幅度提高;同时,采用铺轨电瓶车牵引梭车出渣,不使用铲车、无轨出渣车等燃油设备,工作面环境得到极大的改善。

水工筒井式超深地下连续墙施工关键技术研究

为提高软土、中风化泥质粉砂岩和高地下水位地层的水工筒井式超深地下连续墙施工技术水平,通过对超深地下连续墙的重点如成槽、钢筋笼吊放及对接、混凝土绕流等3个关键环节进行技术把控,找到各环节的技术难点,根据施工中遇到的实际问题,分析原因并提出对应防控改进措施。通过实践证明这些措施操作简便、行之有效,可为类似超深地下连续墙项目提供指导和借鉴。

我国城市地下空间盾构法隧道工程技术新进展

基于盾构施工特点,对盾构法施工技术的发展过程和创新进展进行调查研究,总结盾构法施工技术在地铁、市政公路、城市铁路、城市水工隧洞、城市综合管廊等工程中的最新应用,阐述城市盾构法隧道在地质条件多样化、越江跨海常态化、结构断面多元化、地面条件复杂化、隧道结构耐久性等方面面临的技术挑战。介绍超大直径盾构装备、大直径泥水盾构常压换刀、多模盾构、类矩形盾构隧道建造、联络通道机械法施工、软硬极端悬殊地层掘进、富水砂卵石地层土压平衡盾构、地下高地震烈度盾构隧道减隔震抗震和超长距离综合施工等技术创新成果;总结不良地质识别、设备状态实时感知、同步推拼连续掘进、盾构自动驾驶技术、盾构智能化管控平台等盾构智能掘进技术进展;指出城市地下空间建设盾构法隧道工程的发展趋势,地铁隧道、城市道路、综合管廊、城市给排水等设施需要不断更新,并网络化,盾构法隧道技术需要不断发展,盾构法隧道智能化施工需日趋精益。未来盾构装备将朝着“多模式、无刀化、外星化”等多元化,多源信息感知、管片智能拼装、地质探测预报、自主感知掘进决策等智能化以及特大直径、超长距离、超大埋深、超高水压等方向发展。

装配式新型绿色生态挡土墙施工技术研究

传统的挡墙在施工时,大多数采用的是现场进行浇筑的方法进行,该种方法能够较好地适应现场施工的环境,但存在建设周期长,整体造价高以及景观效果呈现差等特点。因此预制化、绿色生态是挡墙发展的趋势。本文以四川某新型绿色生态挡墙的施工为例,介绍一种装配式绿色挡土墙,首先对其在实际案例中的构件尺寸和规模进行阐述,随后讨论其在施工过程中的安装工艺和施工要点并对主要施工控制技术进行研究。

GIS+BIM技术在地下综合管廊管理中的应用

综合管廊作为城市道路地下空间开发利用的重要组成部分,在保障城市供应、优化城市规划和市政管线间的布局、提升城市整体发展增速方面起到了重要作用。但由于地下综合管廊涉及单位多、专业技术性强、数据信息量大等特点,采用传统的管理手段很难满足需求。基于此,本文以广西南宁市地下综合管廊建设为例,研究GIS+BIM技术在管廊项目全生命周期应用与管理中的优势及特点,以期提升管廊建设、运维的水平。

探索非煤矿山副井马头门施工技术改进措施

马头门是矿井工程中的重要节点,但也因其结构复杂、掘进断面大、支护面积大等原因存在多个施工难点。针对马头门施工进度迟缓对矿山整体投资建设产生负面影响的问题,保证马头门在计划时间内完工,节省人工成本、设备成本和其他相关成本,提高施工效率,以本钢矿业花岭沟铁矿副井马头门为研究对象进行探索改进。结合现有工程技术条件、从施工工艺及组织安排等方面开展科学论述,主要从掘进和支护两方面提出整改措施,现场的实践证明可提高工作效率50%,实现安全增效的施工目标。

地铁车站暗挖隧道穿越既有线的施工技术研究

针对地铁车站暗挖隧道穿越既有线的施工技术进行了深入探讨,以确保施工安全并减少对既有线路运营的影响。通过精确操控盾构机姿态、同步注浆与二次注浆压力控制,以及后期沉降的严格监测,可有效控制隧道施工精度和稳定性。在支护结构设计中,采用复合衬砌支护方式,强化了隧道的基础承载作用力。通过综合运用优化后的施工技术和管理策略,地铁车站暗挖隧道能够成功穿越既有线路,且对既有线路的运营影响最小化。在施工过程中,严格控制各项参数,将隧道变形量控制在3.2 mm以内,确保了施工质量和既有线路的安全,并为类似工程提供了宝贵的经验。

地铁施工中地下车站防水施工技术研究

地下车站作为城市地铁系统的重要组成部分,其防水性能对地铁的安全运行和持久耐用性具有至关重要的意义。首先,阐述了地下车站防水的重要性,包括防止地下水渗漏、保证使用安全和延长使用寿命。其次,介绍了地铁施工中地下车站防水的主要技术,如墙体防水、地面防水和结构接缝防水等。最后,讨论了保障防水施工质量的关键措施,目的是为地铁地下车站的防水施工提供专业的分析和实用的解决方案。