实例分析高速公路箱型桥顶进施工技术

XX高速公路台南互通简易辅道10+907.3941-11.5箱形框架桥工程正交与SS高速公路394+950处,采用对顶法施工。该框架桥采用东西两幅对顶,两幅长度分别为15.025m、16.135m,首先进行西半幅的试顶和顶进工作,而后进行东半幅施工。施工中采用9套千斤顶和油泵。千斤顶用中原预应力工艺设备厂的YDD3000台座式千斤顶,油泵用同厂配套的ZB2×2/50型电动油泵。     

综合管廊穿越施工方案造价研究

本文以综合管廊下穿高速公路立交桥工程为例,对综合管廊穿越常见的三种施工方案-明挖顺作、管道封闭顶进、预制管廊封闭顶进进行造价分析,为综合管廊穿越的造价提供指导。本文对影响穿越方案造价的因素进行了研究,定量分析了三种方案不同长度的造价,据此提出明挖顺作方案和顶进方案的经济平衡点观点。结果表明,当穿越长度小于经济平衡点时,明挖顺作方案造价经济;当穿越长度大于经济平衡点时,顶进方案造价经济;当穿越长度等于经济平衡点时,明挖顺作方案造价与顶进方案造价相当。经济平衡点的计算可为穿越方案的选择提供指导。     

大秦铁路2—14m框构桥顶进施工技术

大秦线为重载铁路，行车速度快，列车编组长，运力特别紧张，同源高速公路设计以2—14m框构下穿大秦铁路正线，如何在最短时间内安全优质完成框构顶进施工任务是一项比较复杂的技术难题，本文采用3—5—3扣轨及纵抬横挑工字钢加固线路、列车限速45km／h，实现了快速安全顶进施工。本文从路基防护桩、后靠背、顶进设备、线路加固及拆除、框构挖土顶进等方面详细介绍了下穿大秦铁路顶进框构的施工技术，为今后类似框构顶进施工提供了技术参考。     

铁路顶进框构桥两侧路基旋喷桩加固防护

本文通过沈阜开发大道穿越西部工业走廊铁路公铁立交桥工程框构桥施工,采用旋喷桩施工方案作为框构桥顶进施工时线路两侧土质不良路基固化处理和防护的主要方式加固施工,确保顶进施工中,顶进前、侧天窗悬空跨度在安全范围以内,确保施工过程中铁路行车安全。     

喀斯特地质浅埋大跨地铁车站挑顶转换施工关键技术——以贵阳地铁3号线北京路站为例

为解决喀斯特地质浅埋大跨地铁车站斜井进正洞施工难控制、易变形的问题，以贵阳地铁3号线北京路站斜井进正洞为例，提出了斜井进正洞的挑顶转换施工关键技术，对施工方案，施工流程和施工关键技术进行凝练；整个挑顶转换过程实现安全、有序、快速、优质，既保证了本工程的安全建设，也为其他类似工程提供借鉴方案。     

复杂条件下大跨度斜交框架顶进线路加固及顶进技术

本项目为下穿铁路的大跨度斜交框架顶进施工,且顶进框架两侧均紧邻既有涵洞,现场施工环境复杂,线路加固的施工技术难度高,铁路安全运营的压力非常大。通过采取安全可靠的D型施工便梁进行线路加固,且根据现场具体情况,设计了2阶段线路加固方案。并通过采取合理有效的基坑防护等安全措施,严格按安全规程进行现场顶进施工,顺利完成了本工程框架的顶进施工。     

太原市南内环框构桥顶进施工技术

本文结合石太客专太原枢纽工程实例,详细介绍了大跨度框构桥顶进施工组织设计。论文从总体施工方案、顶进计划及顶进工期控制、安全措施等方面详细阐述,通过严格的施工控制、精细的施工组织,保证了在既有线上顶进框构桥施工的安全、质量及施工进度。     

浅述下穿陇海线大跨度立交桥顶进施工监理

大跨度立交桥顶进施工工序复杂,安全风险较大。本文结合施工监理项目,从施工方案比选、施工程序、施工监控等方面对大跨度立交桥顶进进行介绍,总结监控措施。     

既有线箱形桥架空施工技术

随着我国铁路发展，现有平交道口已很大程度上影响了提速的需要，要改变这种现象，必须将平交道改为立交道，但是为了不影响铁路行车，只有采用线路架空的方式，对框架桥进行顶进施工。本文通过候西线某框架桥的施工，对架空方案的选择、顶进施工前应注意的安全事项等进行了阐述。     

顶进施工技术在下穿铁路框架桥中的应用

框架桥涵顶进施工技术是下穿既有铁路中工程施工的关键技术,广泛运用于增建或新建道路、铁路中。本文结合蓟汕高速公路中下穿北环铁路下的框架桥涵工程,简要介绍了顶进施工技术在下穿铁路工程中的施工步骤及关键技术。结果表明,顶进施工技术具有较好的经济效益和社会效益。     

Incumplimiento del salario mínimo en Europa central y oriental

En este estudio se analiza el incumplimiento del salario mínimo durante el periodo 2003–2012 en diez países de Europa central y oriental con salario mínimo obligatorio nacional. A partir de los datos de EU‐SILC y la metodología propuesta por Bhorat, Kanbur y Mayet (2013), se cuantifica la incidencia y magnitud del incumplimiento. Se realizan análisis de regresión sobre determinantes individuales, laborales y macroeconómicos. Aunque la incidencia permanece relativamente baja, los trabajadores a los que se dirigen las políticas de salario mínimo parecen los más expuestos a su incumplimiento. Con el tiempo, una mayor incidencia se asocia a una razón más alta entre salario mínimo y salario medio.     

Cultural Economy Planning in Creative Cities: Discourse and Practice

While a growing body of research analyses the functional mechanisms of the cultural or creative economy, there has been little attention devoted to understanding how local governments translate this work into policy. Moreover, research in this vein focuses predominately on Richard Florida's creative class thesis rather than considering the wider body of work that may influence policy. This article seeks to develop a deeper understanding of how municipalities conceptualize and plan for the cultural economy through the lens of two cities held up as model ‘creative cities’ — Austin, Texas and Toronto, Ontario. The work pays particular attention to how the cities adopt and adapt leading theories, strategies and discourses of the cultural economy. While policy documents indicate that the cities embrace the creative city model, in practice agencies tend to adapt conventional economic development strategies for cultural economy activity and appropriate the language of the creative city for multiple purposes.     

Input/output ranges and performance: an examination of US machine tool producers

Despite the establishment of high-tech multinational enterprises (MNEs) in Ireland since the late 1950s, the country did not succeed in closing the technological gap with most of its EU counterparts. The weak National System of Innovation (NSI), and in particular low business and government R&D levels, combined with a lack of research and technology linkages between MNEs and indigenous firms, explain these poor results. However, the Shannon region in the West of the country presents some specific institutional characteristics that could theoretically make the region a strong technological enclave. The various actors in the region - i.e. the administrative, financial, political and research institutions, as well as the business organizations - have indeed infused a new type of economic development. After a brief review of the available concepts and models articulated around these actors and their interrelationships, the paper analyses whether the Shannon region, taken as an illustrative example, mirrors a specific economic and technological localized setting. The study is based on a survey of indigenous and foreign firms.     

Sixty years of discrimination and diversity research in human resource management: A review with suggestions for future research directions

This article reviews discrimination and diversity research published in Human Resource Management (HRM) over the past 60 years. While discrimination and diversity are very different constructs, it is often informative to study them together, because when people recognize each other's diversity, this can result in bias, stereotyping, and discrimination. We conducted bibliographic searches for terms related to discrimination and diversity as well as a manual search through every title and abstract published in HRM over the last 60 years to assess article relevance. The search resulted in 135 research articles with 136 unique studies (i.e., samples) which are reviewed in this article. Sex and race are the demographics that have been examined the most in HRM, while religion has been examined the least. Moreover, the number of studies examining lesbian, gay, bisexual, transgender, and queer (LGBTQ) employees in the workplace in HRM has grown quickly within the past 10 years, culminating in a recent meta‐analysis. Our review looks at some of the earliest research published, the most recent research published, and the overall trends we identified in the research over the years for both discrimination and diversity articles. We then make future research suggestions and recommendations to advance the study of discrimination and diversity in the coming years.     

The Early History of the Cumulants and the Gram-Charlier Series

The early history of the Gram-Charlier series is discussed from three points of view: (1) a generalization of Laplace's central limit theorem, (2) a least squares approximation to a continuous function by means of Chebyshev-Hermite polynomials, (3) a generalization of Gauss's normal distribution to a system of skew distributions. Thiele defined the cumulants in terms of the moments, first by a recursion formula and later by an expansion of the logarithm of the moment generating function. He devised a differential operator which adjusts any cumulant to a desired value. His little known 1899 paper in Danish on the properties of the cumulants is translated into English in the Appendix.     

Capturing the Implications of Services Trade Liberalization

This paper evaluates the impact of service sector trade liberalization on the world economy by a ten-region, eleven-sector CGE model with import embodied technology transfer from developed countries to developing countries. Simulation results show that service sector trade liberalization not only directly affects world service production and trade, but also has significant implications for other sectors in the economy. The major channel of the impact is through inter-industry input-output relations and TFP growth induced from services imported by developing countries from developed countries, which may be embodied with new information and advanced technology.     

City Children and Genderfied Neighbourhoods: The New Generation as Urban Regeneration Strategy

Former industrial cities in the West are employing gentrification as urban policy. In these policies, women and families currently play an important role as gentrification pioneers. In my analysis of Rotterdam in the Netherlands, I propose the term genderfication to understand the gender dimensions of this process. Genderfication refers to the production of space for different gender relations. I analyse Rotterdam's urban planning program for becoming a ‘child‐friendly city’, which entails replacing existing urban dwellings with new, larger and more expensive ‘family‐friendly homes’ as a strategy for urban re‐generation. Urban re‐generation supplements regeneration in the form of material and economic restructuring, and refers to the replacement of part of the current population by a new and better suited generation. The ‘child‐friendly city program’ is considered in tandem with punitive ‘youth policies’.     

Hierarchical Models in Environmental Science

Environmental systems are complicated. They include very intricate spatio-temporal processes, interacting on a wide variety of scales. There is increasingly vast amounts of data for such processes from geographical information systems, remote sensing platforms, monitoring networks, and computer models. In addition, often there is a great variety of scientific knowledge available for such systems, from partial differential equations based on first principles to panel surveys. It is argued that it is not generally adequate to consider such processes from a joint perspective. Instead, the processes often must be considered as a coherently linked system of conditional models. This paper provides a brief overview of hierarchical approaches applied to environmental processes. The key elements of such models can be considered in three general stages, the data stage, process stage, and parameter stage. In each stage, complicated dependence structure is mitigated by conditioning. For example, the data stage can incorporate measurement errors as well as multiple datasets with varying supports. The process and parameter stages can allow spatial and spatio-temporal processes as well as the direct inclusion of scientific knowledge. The paper concludes with a discussion of some outstanding problems in hierarchical modelling of environmental systems, including the need for new collaboration approaches.