重力式老码头前沿PHC桩沉桩施工的影响

坦桑尼亚某水工改扩建工程的1#~3#泊位原结构为重力式方块码头,新建外扩部分为宽11.54 m的墩式结构。对1#和2#泊位PHC桩打桩过程原重力式方块码头的位移进行监控,并总结出沉桩规律。结果表明,将重力式方块海侧珊瑚礁石垫层疏浚后施打PHC桩,对原重力式码头结构的位移影响较大,码头面及附近建筑物地面均出现了裂缝;打桩过程中,方块不同结构形式交界面的水平位移最大;采用外凸型十字桩尖桩靴,PHC桩穿透性能最强,原码头方块结构水平位移最小,码头更稳定。     

The future of trucking technology in Brazil: results of a technology forecasting model

Abstract

The aim of this article is to identify a set of technological events related to the Brazilian truck fleet that are well placed hierarchically regarding their possibility of occurrence and pertinence for the horizon year of 2021. For this we propose and apply a Technology Forecasting Model for trucks (called TFM/Trucks) based on the Delphi technique, considering 28 technological events associated with six internal forecasting dimensions: safety, efficient use of energy and alternative fuels, materials technology, operational schemes, comfort and environment. The ranking of the technological events, considering hypothetical situations for analysis, indicate significant concern over the safety dimension, with four of the five events (passive safety and active safety) classified among the 10 events with the greatest chance of occurring and pertinence, irrespective of the panelists' degree of specialization. The environmental dimension, with respect to the predominance of electric powered trucks with lower level of atmospheric pollutants, was always in one of the first two positions, regardless of the situation studied. In the final ranking, the five best-classified events represented the dimensions of safety, environment, materials technology and comfort, with environment and passive safety predominating.     

Energy efficiency,technological change and the dieselization of agriculture in the United States

This study focuses on the increase in the relative importance of diesel fuel consumption on farms in the United States over the 1971–1989 period. Four factors are identified as being central to the observed trend. These include the relative efficiency of diesel powered equipment versus gasoline powered equipment, technological changes that have impacted energy efficiency, the trend towards larger farms, and the enhanced energy conservation by farmers as a result of the adoption of reduced tillage practices.     

客运枢纽车站改造施工方案研究

客运枢纽车站改造施工是一个复杂的综合性工程项目,涉及路基、桥涵、轨道、接触网、通信、信号、电力等专业,技术复杂、相互干扰多、安全风险高,且天窗内施工要在有限的时间和空间内按计划完成施工任务,施工方案必须成熟可靠、思虑周全,具有可操作性才能确保行车安全、施工安全、设备安全。本文结合银川站站场改造实践经验,对客运枢纽站场改造的设计方案优化进行研究,从保障运输秩序、降低安全风险、提高营业线及邻近营业线施工工效等方面考虑,为后期类似的站改施工可以安全、高效、有序地进行,并将行车干扰降至最低提供了可借鉴的技术和经验。     

数值仿真技术在汽车涂装工艺中的应用

针对某款新开发车型其发罩外板内表面前端电泳效果差的问题,利用数值仿真技术对其进行分析。发现主要是由于前端设计不合理,在电泳时形成死腔,产生大的气泡从而导致电泳不上的问题。在增加一个简单的排气工艺孔后,结果大为改善。     

论造船企业科技管理的深层推进与成果体现

科技管理在造船企业中的作用显而易见。从科研项目管理、专利申请、成果鉴定、科技创新和技术进步等几方面着手,多角度分析了科技管理深层推进与成果体现的重要性与必要性,反映了如何精心谋划、全面把握、综合平衡的各项举措,并从全过程管理、可行性运作、支撑点辐射和中长期发展上提出了相应的建议及对策。     

青岛港董家口40万t矿石码头施工关键技术与工艺创新

青岛港董家口40万t矿石码头工程中使用深水抛石基床整平船、液压式胶囊台车、三维千斤顶、6000t超大椭圆沉箱、混凝土套箱、基床升浆等大量的新工艺、新设备、新材料。文章介绍了工程施工关键技术与工艺创新,对大型开敞式码头工程施工具有借鉴意义。     

100 t矿石/矿粉/钢材运输专用车中梁制造工艺

根据100 t矿石/矿粉/钢材运输专用车中梁结构复杂、焊后变形大、450钢焊接难度大以及C级钢焊接、拉铆钉等特点,有针对性地编制制造工艺方案,并顺利完成该车中梁的制造。     

和谐型电力机车检修基地检修工艺布局的研究

对和谐型大功率电力机车检修基地的3种检修工艺布局，即车体定位修检修工艺布局、车体流水修检修工艺布局和车体定位和流水相结合的检修工艺布局的优缺点及其适应性进行了研究，得出了电力机车检修基地应采用车体流水修的结论。     

复合锚杆桩施工成本分析

复合锚杆桩是利用锚杆技术及其机理而衍生出的一种新的基础加固技术，以其工艺简单、加固效果好、经济合理等特点，被广泛应用在市政工程中。但在工程造价管理上，尚无相应定额可直接套用．个别项目简单地借用“锚杆”子目，价格与实际相差甚远。为此，此文以北京地铁十号线国贸站桥桩保护采用的复合锚杆桩施工为例，对复合锚杆桩的工艺流程、成本构成和价格水平作简要分析。以期为同类工程的施工及工程造价的确定提供参考。