桩端桩侧组合后注浆桩现场试验研究

后注浆技术已经成为提高桩基承载力,控制桩基沉降的重要措施.本文以现场试验为主要手段,采用钻孔取芯试验、三轴剪切试验对桩端桩侧组合后注浆桩的承载特性进行研究,分析了浆液的扩散范围及组合后注浆技术对桩周土体的加固效果,结果表明,桩端桩侧组合后注浆技术能够显著提高桩周土体的力学参数,在相同注浆压力下,桩端浆液扩散范围大于桩侧浆液扩散范围.在加固土层中,浆液的渗透及压密作用显著.     

一桩一柱立柱桩垂直度控制技术

一桩一柱立柱桩垂直度控制技术采用一柱一桩结构设计形式,对垂直度偏差控制要求高,施工难度,成为工程施工的难点和重点。文章对一柱一桩结构立柱桩的结构设计进行了分析,并结合某建筑群对其垂直度控制技术进行研究,采用"导向架"校正系统进行立柱桩垂直度的调整是一次成功的尝试。     

岩溶区铁路桥梁桩端和桩侧联合注浆桩承载特性研究

本章基于有限元软件,分析了桩端桩侧联合后注浆桩的承载特性.数值计算结果表明,在同一荷载水平作用下,未注浆桩周围土体的沉降要明显大于桩端和桩侧后注浆桩桩周土体的沉降.桩端桩侧组合后注浆技术对桩基极限承载能力的提升幅度可达100％以上,相较于单一注浆模式,组合注浆模式下桩基极限承载力提升较为明显.后注浆桩的极限承载力的提升...     

静压桩的压桩力与承载力关系分析

本文根据多项工程的压桩力数据和承载力值,推导了桩端持力层为粘性土时静压桩的压桩力与承载力的关系,为根据压桩力来推测单桩承载力及据设计单桩承载力来预估终值压桩力提供了依据。     

预制桩沉桩的通病分析与防治对策

一、桩顶、桩身被打坏 1．现场状况 沉桩过程中，桩顶的边或角被打碎塌落或者桩顶面碎裂．甚至桩头钢筋网部分混凝土被打坏，几层钢筋网裸露，有的桩身混凝土崩裂碎落，甚至桩身折断。     

静压桩施工沉桩阻力及沉桩挤土效应研究

静压桩具有桩身质量易于保证和检查,价格相对较低,以及施工工效高、无泥浆和噪音污染等优点,目前已成为我国工业与民用建筑中,特别是软土地基上各类建筑中广泛采用的桩型之一。但静压桩也有其相对缺点,那就是它属于排土置换桩,容易对周边环境造成不利的影响。随着人们环保意识的不断增强,对静压桩施工沉桩挤土效应带来的各种问题也越来越引起人们的重视。     

预制桩沉桩的通病分析与防治对策

一、桩顶、桩身被打坏 1．现场状况 沉桩过程中，桩顶的边或角被打碎塌落或者桩顶面碎裂．甚至桩头钢筋网部分混凝土被打坏，几层钢筋网裸露，有的桩身混凝土崩裂碎落，甚至桩身折断。     

直桩式高桩防汛墙的优化设计

本文提出考虑土的弹性抗力直桩式高桩防汛墙的力学计算模型;且对方桩间距、方桩受力筋、板桩受力筋进行优化设计;自编程序,算例结果造价比原设计降低20％左右。     

客运专线站场PHC桩的合理沉桩顺序研究

采用圆孔扩张理论解析计算和有限元数值模拟计算对PHC管桩单桩和群桩的挤土效应进行了分析和研究,并同时研究了PHC管桩的挤土效应对CFG桩和搅拌桩的影响,在此基础上进行的不同桩型施工顺序的优化。     

浅析沉桩工艺

随着时代的发展和建筑领域技术工艺的不断更新,沉桩工艺和技术在建筑施工中也不断创造出新的工艺技术。钢筋混凝土预制桩的沉桩方法有锤击法、振动法、水冲沉桩法、钻孔锤击法、静力压桩法等。现就沉桩工艺做浅要分析。     

Urban Informality and the State: Geographical Translations and Conceptual Alliances

Understandings of informality commonly derive from research undertaken in states perceived as lacking the capacity to regulate the practices of their populations. This Interventions forum aims to expand the geographical parameters of empirical research on urban informality. A more global approach, we argue, also necessitates questioning assumptions that undergird this concept—in particular the underlying conception of the state. In this vein, this collection of papers aims to rethink theories of the state through the lens of informality, and vice versa, to inform and refine the concept of informality through a more thorough understanding of states. In so doing, the contributions engage with concepts that have been central both to theories of the state and to the study of informality, namely governance, agency, legitimacy, sovereignty and legality. Following this introduction setting out our theoretical approach, the Interventions forum unites five empirical studies that discuss the nexus of informality and states in contexts that have been researched less extensively from this perspective, each tackling one of the above‐mentioned concepts. Based on these different entry points, the papers provide novel angles on a state‐theoretical understanding of informality. A concluding essay brings these approaches together, reflecting on the possibilities of translating concepts to different sites.     

Experiencing a New Place as an Atmosphere: A Focus on Tours of Collaborative Spaces

In this article, we ethnographically explore how tour guides convey different embodied experiences of space and place during tours of collaborative spaces. These tours draw on participants’ embodied experience and emotions in order to reveal the invisible dimensions of everyday activities of collaborative spaces, in particular their different organizational atmospheres. By systematically coding 110 tours of such spaces, we identify four emotional registers – “initiation,” “commodification,” “selection,” and “gamification,” which are used by tour guides to produce a particular atmosphere. We feel that the concept of “atmosphere” is a powerful means of exploring the unbounded and fluid spatiality, the quasi-materiality, and the temporality of the work practices that individuals are likely to experience if they become members of these collaborative spaces. We conclude our analyses by considering the implications of this study for the management of collaborative spaces and new work practices more generally.     

TRIZ理论在价值优化中的应用

文章将TRIZ理论引入到价值优化中,通过对机械产品的价值分析,确定出价值优化对象,这时可运用TRIZ方法,把实际的问题转换为TRIZ问题,并通过相应途径增加价值优化对象的价值,提出创新方案,从而解决需要价值优化的实际问题,达到较好地完成产品价值优化的目的。     

Urbanization and the City Image in Lowry at Tate Britain: Towards a Critique of Cultural Cityism

This article explores cultural cityism at a time when a more expansive, ‘planetary’ urbanization is argued to have superseded ‘the city’ as the dominant urban form. It takes an essentially Lefebvrian problematic and works this through an examination of one aspect of contemporary metropolitan culture, the L.S. Lowry exhibition at Tate Britain, held in the summer of 2013. The article scrutinizes the juxtaposition of Lowry's images of the industrial city with the image of ‘global’, corporate London provided by Tate Britain itself. The exhibition is presented as evidence of Lefebvre's argument that although the urban core has imploded and exploded, through images the city ‘can perpetuate itself, survive its conditions’. Taking stock also of the preponderance of city images in culture more widely, it is argued such images make a fetish of the city, producing also an ‘urban pastoral’ that obscures the defining characteristics of urban life today. Finally, Benjamin's concept of the ‘dialectical image’ and Rancière's notion of the ‘sentence image’ are invoked to capture the flashing together of past and present city images and the opportunities for critical reflection this constellation presents.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

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.     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

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.     

Re-imagining the growth process: (co)-evolving metaphorical representations of entrepreneurial growth

We investigate the role and influence of the biological metaphor ‘growth’ in studies of organizations, specifically in entrepreneurial settings. We argue that we need to reconsider metaphorical expressions of growth processes in entrepreneurship studies in order to better understand growth in the light of contemporary challenges, such as environmental concerns. Our argument is developed in two stages: first, we review the role of metaphor in organization and entrepreneurship studies. Second, we reflect critically on three conceptualizations of growth that have drawn on biological metaphors: the growing organism, natural selection and co-evolution. We find the metaphor of co-evolution heuristically valuable but under-used and in need of further refinement. We propose three characteristics of the co-evolutionary metaphor that might enrich our understanding of entrepreneurial growth: relational epistemology, collectivity and multidimensionality. Through this we provide a conceptual means of reconciling an economic impetus for entrepreneurial growth with an environmental imperative for sustainability.     

Shenzhen: city of suspended possibility

This essay on Shenzhen, China, presents three vignettes addressing the question of home in a city of migrants. The first section explores the ubiquitous narratives of success forming the city's foundational myth. The second follows this myth into the world of a Shenzhen filmmaker and his characters, as they navigate the tension between the idea of home and the urge to start anew, resulting in the suspended possibility of the title. The last section looks at young architects who hope to preserve the city's heterotopic sites of migrants and original villagers through architectural innovations. The cases show how an economy of desire supplements the political economy of this export-driven city. The city appears as an urban desiring machine that produces itself as an object of desire for the migrants of all classes who flock to its factories, "urban villages", white-collar jobs, luxury villas and underground economy. The essay is an encounter with the mythology of success and failure, the intertwining of home as an end and home as the beginning, and with the manipulation of space that allows residents to control their own subjectivity.     

The Power of Group Stigmatization: Wealthy Roma,Urban Space and Strategies of Defence in Post‐socialist Romania

Recent research on Roma stigmatization has tended to focus on the marginal socio‐economic and spatial position of Roma people within European societies, with poverty, persistent inequalities and substandard housing conditions (for example, ghettoization) highlighting their differential treatment. Central to such accounts are group images and stereotypes of Roma as ‘benefit scroungers’ and/or ‘beggars’ lacking notions of self‐restraint and social responsibility. This body of research is hugely important in terms of its contribution to an understanding of the complex dynamics of marginalization and stigmatization of poor Roma households. Yet not all Roma are characterized by poverty and economic hardship. This article explores the neglected experiences of wealthy Roma within urban spaces in Romania. It draws on empirical evidence from interviews with Roma families, leaders and local authorities. Our analysis exposes the way in which Roma are vehemently stigmatized regardless of their economic position or housing circumstances and highlights deep underlying sentiments towards them within Romanian society. We critique Wacquant's concept of territorial stigmatization by applying it to wealthy groups outwith typical areas of relegation (for example, Roma ghettos) within the specific urban context of post‐socialist Romania. While our analysis points to the internalization of stigma, we also identify distinct defensive strategies wealthy Roma employ to counter and avoid stigmatization. We suggest that a focus on the neglected spaces of wealthy Roma groups can facilitate a more comprehensive understanding of the distinct urban power relations that shape Roma stigmatization, reveal how this long‐term process has recently been accentuated within Europe alongside a more overt populist and anti‐Roma political agenda, and contribute to the development and refinement of Wacquant's thesis.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

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.