同层排水技术

同层排水技术在我国应用日益广泛,预计同层排水技术将成为排水管道敷设方式的主流.本文就同层排水三种类型最具代表性的隐蔽式安装系统作一扼要介绍.     

同层排水技术

同层排水技术在我国应用日益广泛，预计同层排水技术将成为排水管道敷设方式的主流。对同层排水三种类型最具代表性的隐蔽式安装系统作了扼要介绍。     

超高层钢结构竖向鱼腹式组合桁架塔冠施工技术

以高达333 m的深圳城建大厦项目为例，介绍了塔楼67～72层鱼腹式组合桁架结构的安装方法，通过方案比选、地面拼装、吊装工况的分析对塔冠鱼腹式组合桁架结构的安装进行了深入研究，采用“地面拼装、高空散拼、双机配合”的施工工艺，结合midas Gen等有限元软件分析、分段分节优化等一系列措施，可精确实现鱼腹式组合桁架结构的安装作业，保证施工的安全性，为类似项目施工提供借鉴。     

浅谈提升式操作平台与筒模结合在建筑工程中的应用

在高层建筑结构施工中,电梯井壁大多都是钢筋混凝土结构,结构统一。传统电梯井模板安装大多是采用钢管扣件脚手架搭设支模平台,再在其上进行模板拼装作业,电梯井整体提升式操作平台则是省去繁琐的架体搭设步骤,安装定型式提升平台,可跟随作业层逐层提升,再在其上安装电梯井筒模,整体实现电梯井定型化施工,即方便快捷,又安全可靠。     

Z80折臂式塔式起重机拆卸方案

Ｚ８０折臂式塔式起重机拆卸方案史耀平（江苏省宜兴市建筑安装工程总公司三公司）宜兴市青云大厦为框架剪力墙筒体结构，其中地下室２层，地上２４层，建筑高度８３．５ｍ。该工程使用的垂直运输设备是上海建工机械厂生产的２８０固定折臂式塔式起重机，安装总高度９３ｍ...     

浅谈卫生间隐蔽式安装系统同层排水技术

同层排水指接纳卫生器具的排水支管均在设置设备的同一层接至排水立管,即排水支管不需要穿越楼板的一种排水方式。同层排水三种型式中,隐蔽式安装系统使用效果及环境卫生条件最好,在有条件的公共建筑及住宅卫生间提倡采用这种同层排水的方式。     

FM(富米)MI1550K型内爬式塔机安装中心线位移及倾斜的纠正

广东省佛山国际商业中心工程地上60层，楼高228m，地下3层，-11．4m，总建筑面积11万m^2。该工程施工中安装的其中一台塔吊是FM(富米)MI1550K型可转换内爬或外附着式，由意大利原装整机进口，在该工地是首次安装使用。     

同层排水技术

同层排水技术在我国应用日益广泛，预计同层排水技术将成为排水管道敷设方式的主流。本文就同层排水三种类型最具代表性的隐蔽式安装系统作一扼要介绍。     

分装式永磁直流力矩电机的安装及固定方法

介绍分装式永磁直流力矩电机的安装方法.详细阐述安装要求、安装步骤及安装工装的设计思路.该方法安全、方便、快捷,被广泛应用于分装式永磁直流力矩电机的安装.     

高速铁路插板式声屏障施工技术

插板式声屏障因其吸音效果明显、安装方便快捷、且美观挡风被广泛应用于当今城际、客专、高铁施工中。但因其安装在线路两侧,受列车通过真空风压反复作用,疲劳强度受损,安装稍有不慎,极可能影响列车运营安全。为此,结合京沪高速铁路插板式声屏障施工实践,介绍预留基础检查、立柱安装与调整、重力式砂浆灌注、单元板安装、接地线安装等工序施工要点、对策措施,为今后类似工程施工提供借鉴经验。     

开孔板连接件相对滑移机理试验研究

为研究组合结构桥梁中开孔板连接件的相对滑移机理,以开孔板厚度、孔中钢筋直径、开孔板孔径为变化参数,进行了21个开孔板连接件抗剪性能模型试验。通过理论分析与试验结果比较,揭示了开孔板连接件相对滑移量主要由孔中钢筋剪切变形量、孔中混凝土压缩变形量和剪切变形量三部分组成,以及抗剪承载力对应相对滑移量随板厚增加而减小,随孔径、孔中钢筋直径增加而增大的滑移机理。     

横向流动土体作用下的群桩反应性状

借助FLAC3D程序,分析了基坑开挖后土体横向流动作用下坑内群桩的反应性状。研究了两桩、四桩、五桩、六桩群桩中基桩的反应性状,并与相同位置的单桩反应进行了比较,得到了受横向流动土体作用的群桩相互作用规律:桩基连线平行于边坡布置的两桩,相互影响并不明显;而在其它情况下,前排桩对后排桩遮拦、后排桩对前排桩阻挡,均使受影响的桩基内力分布改变,桩身最大变形量减小;受周围越多、越近桩基的影响,基桩的内力和变位减少得越多。根据桩间土体的成拱特征,定性解释了群桩相互作用的机理与规律,具体工程的现场量测结果也验证了此结论。     

Time to build options in construction processes

Time to build is a very important factor in a real estate development venture. Delay in completion of a project not only affects the financing costs and the rental revenue but also it may, on a more strategic note, determine the success or failure of a project. A time to build option model consisting of a stochastic rate of completion and a stochastic net project payoff is applied to the sequential construction process of a large scale construction project. The results of the sensitivity analysis show that the optimal payoff value, that triggers the exercise of the option to invest at a maximum rate, increases positively with the increases in cash flow volatility, input cost uncertainty, excess asset return per unit risk and maximum rate of investment. However, it has a negative relationship with the rental yield. In a case study involving a commercial project, the premium for hedging the payoff risks by pre-leasing a project was estimated at 11.29%, whereas the additional cost incurred for shielding a project against input cost risks in a design and build contract was estimated at 7.80%, where each is given as a percentage of the total construction costs.     

Development of a shrouded wind turbine with a flanged diffuser

We have developed a wind turbine system that consists of a diffuser shroud with a broad-ring flange at the exit periphery and a wind turbine inside it. The flanged-diffuser shroud plays a role of a device for collecting and accelerating the approaching wind. Emphasis is placed on positioning the flange at the exit of a diffuser shroud. Namely, the flange generates a low-pressure region in the exit neighborhood of the diffuser by vortex formation and draws more mass flow to the wind turbine inside the diffuser shroud. To obtain a higher power output of the shrouded wind turbine, we have examined the optimal form of the flanged diffuser, such as the diffuser open angle, flange height, hub ratio, centerbody length, inlet shroud shape and so on. As a result, a shrouded wind turbine equipped with a flanged diffuser has been developed, and demonstrated power augmentation for a given turbine diameter and wind speed by a factor of about 4-5 compared to a standard (bare) wind turbine. In a field experiment using a prototype wind turbine with a flanged diffuser shroud, the output performance was as expected and equalled that of the wind tunnel experiment.     

J型烟囱的设计

为满足燃油锅炉的烟气排放要求，设计了Ｊ型烟囱，它由斜三通，直管，膨胀节，防爆门，雨漏、落水管道组成；给出了烟囱高度计算公式，指出烟囱设计中应注意的几个问题。实际运行表明，这种烟囱烟气排放指标符合当地环保要求。     

Life-cycle social analysis of motorway bridges

User costs of a bridge are the costs incurred by the users of the bridge, which result from any construction and/or maintenance activity being performed in the bridge. Typically, these costs encompass the additional time lost due to incurred congestion, the additional costs of vehicle operation and the costs of additional accidents. Usually, such costs are not considered in the procedures leading to the formulation of strategies for bridge construction, maintenance and repair, despite their relevance in comparison with the costs incurred by the agency or owner of the bridge. Moreover, in a life-cycle perspective of a bridge, with a time span over 100 years, the quantification of user costs is affected by a large number of uncertainties. Therefore, it is the purpose of this paper to introduce a life-cycle analysis for the quantification of typical user costs, in a probabilistic approach. For this purpose, the analysis of a motorway bridge in Portugal is performed. The results of the case study demonstrate that user costs can be much more important than costs supported by the concessionaire, in a life-cycle perspective, and thus, a much higher importance should be given to these costs apart from the scientific community.     

Energy landscape: Los Angeles Harbor and the establishment of oil-based capitalism in Southern California, 1871–1930

In the first three decades of the twentieth century, the Los Angeles metropolitan area emerged as the fastest growing urban–industrial economy on the Pacific Coast. This was a significant achievement for a city without a natural harbour. Despite formidable barriers presented by physical geography, the gradual development of a deep-water harbour in Los Angeles was fundamental to the emergence of oil-based capitalism in Southern California. In the first three decades of the twentieth century, under the municipal governance of a Board of Harbor Commissioners, private oil companies developed Los Angeles Harbor into a modern transhipment facility comprising infrastructures and technologies dedicated to the efficient transportation, storage, and refining of petroleum and petroleum-based products. From this perspective, Los Angeles Harbor needs to be understood as a long-term, fixed-capital investment into oil-based energy as fuel for industry and transportation. As a transhipment facility, Los Angeles Harbor also functioned as a critical outlet for surplus energy after the discovery of several large fields in the Los Angeles Basin in the early 1920s. By focusing on a particular built landscape, this paper aims to contribute insight into how geographies of fixed-capital investment play a role in the regional dynamics of energy transition and establishment.     

Nonlinear analysis and reliability of metallic truss structures

The present study goes into the search for the safety domain of civil engineering structures. The objective is to show how a reliability-evaluation brought by a mechanical sizing can be obtained. For that purpose, it is necessary to have a mechanical model and a reliability model representing correctly the behavior of this type of structure.It is a question on one hand, to propose a formulation for the nonlinear calculation (mechanical nonlinearity) of the spatial structures in trusses, and on the other hand, to propose or to adapt a formulation and a modeling of the reliability. The principle of Hasofer-Lind can be applied, in first approach, for the reliability index estimation, scenarios and the probability of failure.The made check concerned metallic in truss structures. Finally, some structures are calculated using the method adapted by Hasofer-Lind to validate the probability approach of the reliability analysis.     

Choctaw Eco-Industrial Park: an ecological approach to industrial land-use planning and design

This project investigates the concepts of industrial ecology and eco-industrial parks and applies those concepts to the redesign of an existing industrial park in Choctaw, OK. The opportunity for developing an eco-industrial park on this site comes from the availability of waste water for non-potable water needs, and the abundance of waste tires as raw materials for products to drive a new set of industrial partnerships. These industrial partnerships include the City of Choctaw Waste Water Treatment Plant, a tire shredding company, a tire pyrolysis company, a hydroponics industry, a hard rubber tire manufacturer, a screen printer, a plastics manufacturer, a toner manufacturer, and a toner cartridge manufacturer. The nature of this relationship and the design of the eco-industrial park is contained within this report. The result of this investigation is a new, common sense, approach to industrial land use that combines economic growth and environmental protection.     

Management of bridges with shallow foundations exposed to local scour

Abstract

The Serbian road network includes a large portion of bridges with shallow foundations vulnerable to local scour as tragically demonstrated during the extreme flooding in May 2014. Currently, the bridge management procedures in Serbia and worldwide do not comprehensively account for a risk of bridge failure due to flooding and fail to provide sufficient information for the decision-making. Thus, a novel methodology for quantitative vulnerability assessment is suggested as a tool to identify the most vulnerable bridges in a network. Herein, the essential task is evaluation of the conditional probability of a bridge failure due to local scour in a flooding event of a certain magnitude. To apply this approach on a network level, there is a dire need to establish precise practice-ready guidelines on an optimal set of information to be used and/or collected in situ, which is discussed on an example of the Serbian bridge database. The vulnerability of a bridge to local scour may be used as a comprehensive indicator of a bridge performance in a flooding event. For a network level, the vulnerability maps with respect to flooding of different magnitudes will give road operators crucial information to apply adequate quality control plans to vulnerable bridges.