Evaluating the Impact of Workshop Management on the Progress of Road Construction Projects(Case Study:Road Construction Projects of Tehran Province)

Construction projects,including road construction,are very important.Therefore,a lot of money is spent on these projects every year.So,the lack of proper planning will increase the cost and cause irreparable damage to the country.The role of workshop management is one of the most important factors in increasing the cost of these types of projects.Generally,workshop management plays a very important role in improving the quality and quantity of projects and has an important place in the project implementation process.Therefore,this study evaluated the impact of workshop management on the progress of road construction projects on a case-by-case basis in road construction projects in Tehran province.According to the purpose of the research,this study was a descriptive-survey type.In addition,the tool used in this research was a questionnaire.The statistical population of this research included all experts and specialists in road construction projects,among whom 65 people were selected by snowball method.Then the collected data were analyzed using SPSS software.The results of this study showed that the management of the workshop and its role in the control and implementation of projects is a complex process,which can be implemented at high levels and effectively by combining scientific and experimental training.And a very important point in the discussion of workshop management is applying scientific management to the use of valuable experiences from others.Because management knowledge not only does not negate the use of these experiences,but also emphasizes the necessity of using them.In other words,improving the knowledge of workshop management is one of the requirements for the implementation of value engineering in construction projects,especially road construction,and it is very important.

Discussion on the Application of Pipe Jacking Construction Technology in Municipal Road Drainage Projects

In the construction of municipal road drainage projects,pipe jacking construction is a relatively common construction method.This construction technology can avoid a large amount of excavation work,improve drainage construction efficiency,avoid large-scale damage to the road surface,and exert small traffic impact.Therefore,it is currently widely used in drainage construction,but judging from the current actual application situation,there are still many problems that require further improvement.This article mainly analyzes the advantages of and current technical problems in pipe jacking construction technology in detail,explores corresponding solutions,and lays a foundation for the optimization of municipal road drainage engineering construction.

Key Points in the Supervision of Road Landscaping Project——A Case Study of the South 3^(rd) Ring Road in Yanta District of Xi'an City,China

Characteristics of road landscaping were analyzed,as a kind of "linear" landscaping,it could be classified into urban street landscaping,urban ring road and expressway landscaping.Differences between road landscaping projects and other garden landscaping projects or construction projects were analyzed.Landscaping project for the South 3rd Ring Road of Xi'an City(in Yanta District)was taken for an example to summarize construction experience,discuss present conditions and features of garden landscaping supervision in China.The artistic and physiological properties of garden landscaping,as well as the supervision during maintenance period were stressed,but it was also pointed out that garden landscaping supervision in China was actually not given sufficient attention.On this basis,key points in the supervision of road landscaping project were proposed:understanding design ideas,selection of landscape plants,quality control of concealed works,prevention and control of diseases and insects,construction safety management and overall image;only by effectively implementing these key points,a high-quality road landscaping project could be realized to improve the image of a city and beautify its environment.

Design of Aided Decision-Making Program for Prioritizing Construction Projects in Urban Road Network Planning

The importance and complexity of prioritizing construction projects (PCP) in urban road network planning lead to the necessity to develop an aided decision making program (ADMP). Cost benefit ratio model and stage rolled method are chosen as the theoretical foundations of the program, and then benefit model is improved to accord with the actuality of urban traffic in China. Consequently, program flows, module functions and data structures are designed, and particularly an original data structure of road ...

Landscape Network Approach to Assess Ecological Impacts of Road Projects on Biological Conservation

Awareness of the adverse ecological effects of road and other large construction projects has resulted in a rapidly growing demand to quantitatively predict and evaluate the effects on gene flow among plants and animals in natural habitats.In this study,we evaluated the effects of different road construction scenarios on animal species movement by using the methods of ecological landscape connectivity in the typical regions of Yunnan Province,China.The results showed landscape connectivity levels(Probability of Connectivity(PC))decreased after road construction and species with lower dispersal abilities were more affected to the subsequent habitat fragmentation.First level roads affected landscape connectivity most significantly.At a distance of 100 m,the PC index decreased more than 50%.Further analysis suggested that the use of landscape connectivity to assess landscape processes revealed the adverse effects on the species movement more effectively compared with the traditional landscape pattern analysis.In addition,we conducted a graph theory and a least-cost modeling discussion,it is obvious that they are powerful tools to represent and analyze landscape networks with respect to related species movement.Network analysis offers a quantitative and simple but effective tool for ecological process assessment and biological conservation on large scales.

Perceived Benefits of Using Value Engineering on Road Projects in Ghana

The need for Optimum Value benefit realization on Road Projects in developing countries has become topical. While the traditional Cost Control project management process only aligns actual costs with budgeted costs, Value Engineering (VE) is a sustainable and systematic innovative methodology for establishing the best functional balance among desired features of a project. A Value Engineering (VE) study was conducted with the aim of examining the benefits associated with its use on Road Projects in Ghana. This study employed a two-stage research procedure: desk study and field research. The literature review identified the Optimum Value benefits associated with VE road project management technique as increased Confidence Level in Contract Compliance, reliable Implementation Level of Construction Delivery and enhanced Effectiveness Level of Project Sustainability. A quantitative survey research design based on a purposive sampling technique of selecting respondents was adopted. Employing closed-ended questions, 40 sets of questionnaires were issued to professionals in Road Infrastructure and Support Agencies (RISA) under the Ministry of Roads and Highways (MRH) in the Eastern Region of Ghana. At a response rate of 85%, descriptive statistical analysis (Means, Standard Deviations and Variances) and inferential statistical analysis of variance (ANOVA) test were used to process the data and determine whether there was any significant difference between VE benefit parameters and the groups of respondents. The results revealed that road professionals are familiar with the VE process but solely use Cost Control project management technique. Road professionals recognized the high Optimum Value benefits of professionally ethical Contract Compliance, efficient Construction Delivery and functionally viable Project Sustainability on VE road project management process.

Research on Government Compensation for Toll Road Public-Private Partnerships (PPP) Projects

With the continuous implementation of the PPP projects,due to the imperfection of relevant policies,the blindness of government subsidy is constantly emerging.Thus,it is important to put forward a practical approach for valuing the subsidies and risk.In this paper,the revenue subsidies model and traffic subsidies model are established.Then combined with practical cases,Monte Carlo simulation is used to get the value and probability of government subsidies under different compensation ways.On this basis,the influence of initial traffic volume and traffic growth rate on government subsidies and net present value of investors is analyzed.The research findings can provide theoretical guidance for the government to choose a reasonable way of subsidies,balance the risk of compensation,and formulate subsidies policies.

Support Vector Machine Cost Estimation Model for Road Projects

A cost estimate is one of the most important steps in road project management. There are ranges of factors that mostly affect the final project cost. Many approaches were used to estimate project cost, which took into consideration probable project performance and risks. The aim is to improve the ability of construction managers to predict a parametric cost estimate for road projects using SVM （support vector machine）. The work is based on collecting historical road executed cases. The 12 factors were identified to be the most important factors affecting the cost-estimating model. A total of 70 case studies from historical data were divided randomly into three sets： training set includes 60 cases, cross validation set includes three cases and testing set includes seven cases. The built model was successfully able to predict project cost to the AP （accuracy performance） of 95%.

Evaluating Contractors’ Safety Record and Its Influence on Performance of Road Infrastructural Projects

A number of studies conducted in Kenya and internationally indicated that most of the construction firms and contractors do not seem to strictly observe safety administration in construction industry, hence compromised performance at implementation stage of projects and even later in the post implementation or post-delivery stage. The study aimed to examine the influence of contractors’ safety record on road performance. This is to create better understanding of how the safety record of contractors could either positively or negatively influence performance of roads during post-delivery stage. The study used both descriptive survey research design and correlation design based on a pragmatic mixed method approach. Through stratified sampling and proportionate sampling, a sample of 210 was drawn from a population of 460 comprising of registered contractors and Public Service Vehicles (PSV) drivers within Nairobi County in Kenya. Questionnaires were distributed using simple random sampling. The questionnaires returned were 153 in total representing 72.8% of all questionnaires distributed to the respondents. Data was descriptively analyzed using percentages, frequencies, means and standard deviations for measuring central tendency and variability. Inferential analysis was done by use of correlation and regression. The descriptive analysis revealed that safety policy management system, insurance policy, and adequacy of standards in addressing safety outcome are to some extent practiced and adhered to. However, compliance behavior to safety procedures is still weak and requires improvement. The null hypothesis was tested and the results obtained from a simple linear regression indicated that, R = 0.657, R2 = 0.431, B = 0.359, t = 10.703, F (1,151) = 114.558, p = 0.000 < 0.05. This means that contractors’ safety record has a strong positive and significant relationship with road performance and that 43.1% of variation in performance is explained by safety record. This study recommends that contractors’ safety record should be part, and parcel of the evaluation criteria used in selection of a suitable road contractor to ensure road performance is achieved even after construction is completed. The study is significant in that it contributes to the body of knowledge by providing empirical data on the need for safety procedures in urban road construction and beyond.

Cultural Aspect of Belt and Road Initiative and Project Mausam: Strategy for Engagement

The paper seeks to examine the cultural aspects of the two initiatives to justify the fact that enhancing cultural connections is a two way process and would certainly enable both civilizations to learn from each other. B&R's people-to-people bond strategy and Mausam's initiative to revive cultural linkages are not contradictory in nature but supplement each other. In the backdrop of Doklam Stand-off, the shaken mutual trust between the two neighbors can be healed by further increasing cultural and people-to-people contacts.

Analysis on Factors Causing Project Delays in Road and Highways Sector in India Using Relative Ranking Index Technique

On-time completion of road infrastructure projects is a critical goal.When projects were not completed on schedule and real construction progress is slower than expected,the inconvenience and disruption to business access increases.On time completion is linked to economic and social welfare,as well as safety.Construction delays continue to be a typical occurrence,despite the need of prompt completion.A literature study is conducted in this context in order to learn more about the causes and factors that contribute to delays.Following a thorough review of the literature,it was determined that a questionnaire survey is the most effective and trustworthy way for gathering information about the causes and quantifying delays caused by emergent factors.The Relative Importance Index(RII)method was used to analyze the data,and the reasons for the delay were prioritized according to their importance.This study focuses on the emergent concerns/causes and reasons of concern in road infrastructure projects,as well as how to priorities these issues sequentially during the planning stage.This study survey can assist construction companies doing business in India in understanding the essential or sensitive issues that require special attention in order to conduct their businesses smoothly in this country while employing appropriate project management practices.

中国对外承包工程对共建“一带一路”国家产业结构升级的影响研究

对外承包工程是中国同共建“一带一路”国家开展产能合作的重要形式。文章采用2011-2021年37个共建“一带一路”国家产业结构升级与中国对外承包工程的面板数据,实证检验中国对外承包工程对共建国家产业结构升级的影响及作用机制。研究发现:中国对外承包工程能够显著促进共建“一带一路”国家产业结构升级,但促进作用具有异质性,作用效果因国家收入水平、是否与中国签订自由贸易协定等而存在显著差异。中国对外承包工程对共建“一带一路”国家产业结构升级的促进作用存在单门槛效应,当跨过门槛值后,促进作用将会减弱。中国对外承包工程能够通过促进共建“一带一路”国家经济增长、扩大进出口贸易、吸引外商直接投资等路径,促进共建国家产业结构升级。

基于车载视频抖动矢量的路面平整性评估方法

针对路面平整性评估流程繁琐、效率低、周期长等问题,提出基于车载视频抖动矢量的路面平整性评估方法,实现常态化场景下对路面状态的初步快速筛选评估。使用车载采集设备获取的行车视频作为评估数据基础,对车载图像进行预处理,增强行车视频图像的对比度,降低行车环境变化对视频图像对比度的影响。利用分块灰度投影算法对视频图像进行相似性判定,去除大偏差的抖动矢量和运动目标干扰,提取行车视频的主要抖动矢量特征。采用粒子群优化算法改进投影相关性曲线的搜索模式,通过使用行(列)方向的灰度投影曲线相关性作为适应度函数来提高算法的搜索效率。建立基于遗传算法(genetic algorithm,GA)优化的K-means聚类分析算法,实现了自主采集路段中不同车速条件下的路面平整性分级评估。通过自主采集数据实验验证,基于粒子群优化的灰度投影算法在检测平整路面时,耗时0.148 s,算法效率比原算法提高了91.41%;在检测粗糙路面时,耗时0.123 s,算法效率比原算法法提高了87.58%,且检测出的抖动矢量数值一致。本文提出的基于车载视频抖动矢量的GA-K-means路面平整性分级评估方法能够有效降低初始聚类中心的干扰。

道路新建工程跨线桥的施工技术研究

结合上海沔北路新建工程跨线桥工程,深入探讨了新建道路跨越既有快速道路的跨线桥施工技术。总结了在各种条件制约下,如何充分应用技术手段,将施工面临的安全风险降到最低、将施工对交通带来的影响降到最小、将施工效率提升至最大,以期为类似工程提供参考。

市政道路工程项目全过程造价控制研究

市政道路工程项目全过程造价控制关乎项目的经济效益和可持续发展。文章以贵州省交通规划勘察设计研究院股份有限公司为单位,深入分析了其在市政道路工程项目的全过程造价控制,旨在提出科学的模型和策略。通过研究项目前期、施工阶段和项目后期的关键环节,结合外部环境、内部管理和技术工艺因素进行分析,建立了全过程造价控制的模型,明确了控制目标、建立了控制指标,并制定了相应的控制策略。

基于BIM的路桥项目管理与协调应用研究

随着信息技术的快速发展,建筑信息模型(Building Information Modeling,BIM)在建筑行业中的应用日益广泛。本论文针对路桥项目的特殊性,以解决实际问题为目标,探讨了BIM在路桥项目管理与协调中的应用[1]。通过对实际项目的案例研究,提出了一套基于BIM的路桥项目管理与协调的方法和工具,以优化项目的生命周期管理和提高项目的整体效率。本研究为路桥项目的实际应用提供了有益的参考和指导。

市政道路工程关键技术研究

文中以新合肥西站周边市政道路工程为例,结合新合肥西站、合肥市综合交通规划等,服务于新合肥西站的地下隧道、地面道路、高架桥、市政管网及附属设施等工程建设需要,以满足城市交通快速进出新合肥西站综合交通枢纽的需求。临近、上跨、下穿运营铁路的施工,需紧密结合运营铁路临时过渡施工组织方案,并满足铁路防护相关要求。

某国际公路工程预制梁吊装施工技术研究

在尼泊尔Narayanghat-Butwal Road项目预制梁吊装施工过程中,面临因场地有限、道路无法进行运梁工作及当地无大型起重设备的难题,为顺利完成预制梁吊装施工提出了相应应对措施,并详细叙述了关键施工技术、工艺流程与控制要点等,包括临时道路铺设、预制梁转运、预制梁吊装等,同时分别针对单跨、双跨、三跨及以上预制梁吊装就位进行研究。通过采用相关技术实现缩短工期、降低成本、提高工程质量的目的。

国际工程EPC项目风险识别和应对

文中以项目风险管理流程为切入点,全面分析评估国际工程EPC项目在实际执行中主要面临的政治、合同、设计、人力资源管理等风险类型,阐述在风险管理过程中如何运用科学方法进行风险识别,探讨了规避、转移、减轻和接受等风险应对策略,为相关人员提供技术参考,也为灰岩区等特定水土地形风险区的基础设施项目建设、安全运营提供借鉴。

掺钢渣再生沥青混合料路用性能研究

为探究钢渣再生沥青混合料路用性能,保障公路沥青路面养护质量,延长道路服役年限,文中采用钢渣作为粗集料制备沥青混合料,通过试验对不同再生沥青掺量下钢渣沥青混合料路用性能实施综合评定。研究表明,与常规SMA-13相比,钢渣再生SMA-13高温性能更加优良,动稳定度增加幅度为24.0%~32.0%,车辙深度减小0.02~0.04 mm;再生沥青用量越大,混合料高温稳定性越好,低温及水稳性能降低,抗滑性能基本不变。