首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 234 毫秒
1.
李万有  陈立龙 《民营科技》2011,(4):333-333,93
基坑支护的挡土桩在建设工程的地下部分建设完成后就不起作用了,成为废料。而且挡土桩的经济成本比较高,在地下工程中所占比例也很大。对于挡土桩的利用,现根据工程实例具体的介绍了挡土桩作为地下室外墙的一部分及工程桩在工程中的应用。通过应用将很大程度上降低地下部分的建设成本。  相似文献   

2.
本文应用系统分析的方法,综合考虑影响挡土结构安全、经济的因素和施工对挡土结构的要求,提出一种求得经济上最优的挡土结构设计方法。建立了挡土结构的优化数学模型,研制了相应的计算机程序。本文还根据挡土结构优化数学模型的特点,提出了一种含有离散变量的约束非线性规划问题的附加约束算法,并在挡土结构优化设计中实现了这个算法。  相似文献   

3.
《价值工程》2017,(20):131-133
桩板墙是一种新型的支挡结构,其原理是将钢桩插入到稳定地层中或者通过钢筋混凝土挖孔桩作为主要侧向受力构件,桩间再安装挡土板,利用挡土板后填土并通过挡土板将侧向荷载传递至桩身的直立板条状构件形成的挡土结构物。近些年来,钢筋混凝土桩板墙已广泛应用于铁路路堑高边坡防护中。本文介绍了铁路路堑高边坡桩板墙的施工工艺工法以及施工中的一些体会,可作为同类工程的经验借鉴。  相似文献   

4.
深基坑工程在各项施工项目中应用广泛,是一项综合性很强的系统工程。支护是深基坑施工的重要组成部分,其关系到基坑工程成功与否的关键。地下连续墙支护是应用较多的挡土、挡水结构,本文对其施工工艺和主要施工方法进行介绍。  相似文献   

5.
曾莉 《基建优化》2006,27(3):95-96,107
从优化设计节约投资的目的出发讨论了挡土结构的常用型式、选型方法,并着重推荐了锚杆式挡土墙和加筋土挡土墙。介绍了采用加筋土挡土墙的工程实例。  相似文献   

6.
高层建筑的深基础开挖,尤其是闹市区的开挖,因四周建筑密集,场地十分狭窄.无法放坡.为了降低工程成本.减少土方工程量和对周边建筑的影响.绝大多数高层建筑都采用垂直开挖。这样给挡土支护技术带来了革命性的发展.采用大直径灌注桩加土层锚杆的挡土支护技术以及土钉支护技术在深基坑开挖工程中广泛应用.且经济效果和社会效果十分可观。但是在实际应用中.不管是采用大直径灌注桩加土层锚杆的挡土支护方式.还是采用土钉支护的方式.施工中因各方面的原因而出现了一系列的问题和矛盾,急需解决、提高。  相似文献   

7.
《价值工程》2013,(8):81-83
将整体现浇式预应力锚索桩板墙运用在混凝土连续浇筑施工中,虽然可以缩短工期,减少成本投入,但其设计计算方法还不成熟。通过对云南某山区高速公路上整体现浇预应力锚索桩板墙结构形式实体工程系统的原型试验研究,实测锚索桩板墙在不同工况下的内力及填土土压力,以此为基础分析了该支挡结构在各工况下的力学特征,为设计计算方法的改进提供参考依据。本文选取工后工况下桩板墙的力学特征分析进行阐述。  相似文献   

8.
土工格栅柔性挡墙应用于膨胀土路堑边坡防护在我国是一种新型的路堑边坡加固防护支挡结构。文章结合工程实例,介绍土工格栅柔性挡墙的试验研究及施工工艺,为同类工程提供参考。  相似文献   

9.
地下连续墙是水利工程基坑支护应用较多的挡土、挡水结构,其施工是深基坑支护成功与否的关键。为此研究地下连续墙支护结构的施工方法,对保证深基坑开挖安全有重要的指导意义。  相似文献   

10.
支护结构可分为挡土结构和支撑结构两类。基坑支护结构的作用是支挡土水压力与截水防渗,使基坑开挖和地下工程能给安全顺利施工。在施工期间,须保证基坑与围护结构的安全可靠,以免支护结构破坏、土体失稳或过大变形对基坑周边环境及地下结构施工造成严重的破坏后果。为此,现对建筑基坑钢板支护结构的施工进行简要的分析。  相似文献   

11.
This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.  相似文献   

12.
Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.  相似文献   

13.
Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.  相似文献   

14.
NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.  相似文献   

15.
There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.  相似文献   

16.
A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.  相似文献   

17.
We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.  相似文献   

18.
杨明 《价值工程》2012,31(7):16-17
物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。  相似文献   

19.
丛广英  乔炜君 《价值工程》2010,29(6):245-245
大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。  相似文献   

20.
This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号