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通过某工程特殊位置的塔机拆卸实例,提出3个拆卸方案并对方案进行比选,最终确定用汽车起重机配合施工现场塔机对特殊位置塔机进行拆卸,文章介绍了工程施工的难点及解决方案,并叙述了塔机拆卸施工的过程. 相似文献
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拆卸设置在大面积、大跨度建筑物中间位置的塔式起重机时,汽车起重机不能靠近塔机完成拆卸.本文介绍了使用简易桅杆吊在屋面拆卸JS7022塔机的方案,节约了资金. 相似文献
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随着建筑业施工机械化程度的提高,高层建筑中固定附着自升式塔式起重机(以下简称塔机)的使用日趋广泛,对提高机械化程度起到不可低估的作用。然而,塔机的安装工作却是塔机使用过程中一项危险性较大的非常重要的工作,安装方案编制执行的质量,对安全作业有着重大的影响作用。为了使塔机安装工作能够安全地按期完成并投入正常使用,必须根据建筑物、塔机、施工方式和施工现场实际情况以及行业规定、技术规范要求编制切实可行的安装方案。1安装方案的编制依据11行业、企业对塔机安装、验收方面的政策法规、办法制度的规定,如建设部塔机的年… 相似文献
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为适应地铁施工进度计划不确定性大,易变性强的特点,使用蒙特卡罗仿真分析,对地铁围护结构及支护体系施工进行工期风险优化,以合理控制工期风险。使用Crystal Ball软件,以工序间的关系为基础建立模型,进行蒙特卡罗仿真分析,得出404d内完工概率大于85%;进行灵敏度分析,发现征地拆迁和管线改迁是影响工期的关键活动,可通过增加工期缓冲来保证总体目标的实现。对项目完工概率的容错性进行评估和修正,保证了如期完工。 相似文献
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随着我国经济的飞速发展,土木工程施工建设占有的位置越来越重要。其中土木工程施工进度风险是土木工程施工的重要影响因素。本文通过对土木工程施工进度风险影响因素的分析,提出一些关于控制土木工程施工进度风险因素的意见。 相似文献
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近年来,我国水电工程承包企业不断走出国门对外总承包工程,年均增长速度保持在20%左右。在分析识别国际水电EPC 项目风险因素的基础上,从环境、技术、财务、进度、管理等五个方面构建了风险评价指标体系。基于专家丰富经验的同时,利用层次分析法(AHP)建立判断矩阵,并用软件Matlab 6.5 计算出各判断矩阵的最大特征值及其特征向量,继而确定出各指标的权重,最后应用模糊数学方法(Fuzzy)对项目进行风险评价和分析,以期为水电工程企业进行国际EPC 项目风险评价和管理决策提供科学合理的依据。 相似文献
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Although multinational firms use risk mitigation measures when venturing into new international markets, there has been little research into identifying and evaluating the impact of these risks on project and multinational firm performance in the Arabian Gulf Region (AGR). Risks encountered in the AGR are identified through a data collection process from multinational architecture, engineering and construction (AEC) companies with work experience in the AGR. The impact of these risks on four performance metrics (i.e. project cost, schedule and performance; and company performance) is then evaluated using relative importance index (RII), significance score (SS) and principal component analysis (PCA) for validation. The results indicate that multinational firms are potentially exposed to a total of 27 external risks and 47 internal risks. Of the 27 external risks, war threat, political instability, price inflation, resources availability and quality, authorities and regulations requirements, and inclement climate have the most significant impact on the four performance metrics. Of the 47 internal risks, defective late design documents, constructive changes and insufficient scope definition have the most significant impact on the four performance metrics. These findings can guide multinational AEC firms in the AGR in establishing effective risk mitigation plans. 相似文献
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David Kelly Benedict Ilozor 《International Journal of Construction Education and Research》2019,15(1):3-18
This article reports the findings of a quantitative study on the relationship between various project performance outcomes and the use of Building Information Modeling (BIM), within the commercial construction industry. The literature review identified inconsistent results among prior qualitative and quantitative work concerning the relationships of key project performance measures and BIM use. Data on 13 variables from 93 completed construction projects were collected and examined through a causal comparative research design. Projects that used BIM (in design or construction) were not found to experience significant performance outcomes when controlling for the contribution of other independent variables and covariates at the 95% confidence level (CL). At the lower 90% CL, however, projects using BIM in construction experienced significantly higher levels of schedule growth than projects that did not use BIM in construction. Recommendations are made for training of construction management staff as a step to avoid unwanted schedule growth associated with BIM use during construction. This study is one of a very small group of rigorous quantitative analyses of BIM project performance outcomes conducted to date; additionally, it is the only study that has analyzed BIM in a multivariate context that controlled for the contribution of other project variables not directly related to BIM use. 相似文献
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Dynamic scheduling refers to the integration of three important phases in the life cycle of a project: baseline scheduling, schedule risk analysis and project control. In this paper, the efficiency of controlling a project is measured and evaluated using a Monte-Carlo simulation study on fictitious and empirical project data. In the study, the construction of a project baseline schedule acts as a point-of-reference for the schedule risk analysis and project control phases. The sensitivity information obtained by the schedule risk analyses (SRA) and the earned value management (EVM) information obtained during project control serve as early warning control parameters that trigger corrective actions to bring projects back on track in case of problems. The focus in this paper lies on the time performance of a project, and not on the prediction and controlling of the project costs. 相似文献