浅插法大直径钢圆筒在换砂振沉施工中的应用

大直径钢圆筒凭借其特有的优势被应用在大型人工岛护岸项目中.以某大型人工岛项目为例,针对浅插法大直径钢圆筒施工中遇到的一些实际问题进行方案比选.通过对振沉方法、纠偏方式、振沉顺序等技术方案的分析对比,总结出浅插法大直径钢圆筒在换砂基础中应用的主要工艺:点振法振沉工艺、起重船纠偏工艺和顺、跳打振沉顺序.     

港珠澳大桥西人工岛围护结构正式施工

5月15日,港珠澳大桥岛隧工程西人工岛首个钢圆筒顺利振沉,标志着人工岛围护结构正式开始施工。首个钢圆筒直径22 m,高40.5 m,振沉插入泥面21 m,为目前国内直径最大、高度最高的钢圆筒结构,也是世界上体量最大的钢圆筒结构。这也是全世界第一次采用8台液压振动锤联动振沉体系进行钢圆筒的振沉。     

深中通道项目西人工岛首个钢圆筒顺利振沉

正4月29日,中交水运规划设计院有限公司(水规院)设计的深圳至中山跨江通道项目西人工岛首个钢圆筒顺利振沉,标志着深中通道项目进入了实质性的实体工程施工阶段。钢圆筒作为西人工岛围护结构,为人工岛内隧道干地施工提供重要保障。西人工岛轴线长度为625 m,横向最大宽度为456 m,岛体面积13.7万m~2,岛壁结构长度为1 622 m。西人工岛整体呈菱形,57个钢圆筒和116个副格勾勒出"海上风筝"的素描画。钢圆筒直径28 m,高35~39.5 m,筒质量653 t。深中通道西人工岛采用12台进口APE600型液压振动锤联动振沉方案,以保证钢圆筒振沉顺利。     

广州番禺南沙蒲洲海堤护岸工程大直径钢圆筒振动下沉设备及工艺的研究与应用

本文以广州番禺南沙蒲洲海堤护岸工程为例，介绍了大直径钢圆筒的新结构、振沉钢圆筒的新设备和多台液压振动锤同步振沉的新工艺，可供类似工程参考。     

深中通道西人工岛钢圆筒成岛应用及稳定性分析

深中通道西人工岛采用大直径钢圆筒插入海床围闭岛体的快速成岛工艺.目前,采用钢圆筒快速成岛的案例相对较少,对钢圆筒施工期倾斜及简体稳定性的研究尚待进一步深化.文中以深中通道西人工岛为例,针对钢圆筒振沉直至人工岛陆域形成各施工工况,就简体在岛内外荷载综合作用下发生倾斜超限的成因进行分析,得出具体成因与地质条件及施工期简体内...     

大直径钢筋混凝土圆筒振沉试验结果分析

简要介绍了大直径钢筋混凝土圆筒振沉试验概况和试验结果分析。     

膨润土泥浆改变砂性土振动密实特性的室内试验研究

钢圆筒结构具有施工工期短、经济、耐久性好、施工便捷等特点，目前已在粤港澳大湾区某工程和国内某跨江通道工程中应用。当地基中存在较硬的夹砂层时，钢圆筒在打设过程中会使砂层发生振密效应，造成砂层板结，给钢圆筒振沉带来了很大的困难，强行打设会导致钢圆筒结构产生破坏。因此有必要对夹砂层和砂层地基进行改性，改变砂层土体振动密实特性，使钢圆筒顺利振沉。通过室内膨润土改性砂样的试验研究发现：1）膨润土可以很好地降低砂土的抗剪强度，改性后的黏聚力c有一定的提升，但是内摩擦角φ降低较为明显。2）水土比对砂土抗剪强度的影响较小，膨润土掺量对泥浆改性砂土的抗剪强度有很大的影响。3）膨润土改性砂土选用的泥浆配合比，建议膨润土掺量为5%、水土比选择在8～20。     

深中通道西人工岛大直径钢圆筒拆除施工技术

基于深中通道西人工岛海上大直径薄壁钢圆筒吊装工程实践,对钢圆筒拆除工况及各作业阶段稳定性和受力安全进行了分析,并制定相应的技术安全保障措施.实践结果表明,采用等效计算方式对各施工工况进行分析十分必要,制定的拆除技术安全措施合理可行,可为后续类似工程施工提供借鉴.     

港珠澳大桥西人工岛钢圆筒及岛内回填砂成岛技术

港珠澳大桥西人工岛钢圆筒及副格围护结构振沉完成后，为确保其整体稳定性，采用定点、接力、分层抛填的方案对钢圆筒及副格内回填砂施工，有效控制了钢圆筒围护结构在回填砂施工期间的结构稳定性，防止了不利工况的出现。人工岛围闭前，采取设置龙口直接抛填以及泵送等方式进行水下回填；人工岛围闭后，采取水上抛填加陆上倒运的方案快速实现了人工岛陆域形成，为外海人工岛快速成岛积累了经验。     

番禺南沙港大直径圆筒结构码头施工技术

介绍番禺南沙港大直径圆筒结构施工中的沉放能力估算，沉放计算结果、施工流程、沉放顺序、施工方法和主要机械设备、典型纠偏等情况。     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support;     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

桥梁防撞设施物理模型试验

物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。     

印尼某电厂码头水工建筑物设计

印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.     

开放式数据挖掘系统模型

目前国内已经出现了少量的数据挖掘相关产品。国内数据挖掘软件无论从数量还是质量上比较，都与国外软件存在着较大的差距。随着数据仓库技术的普及，数据挖掘应用的需求越来越强烈，如何缩短这种差距，研发数据挖掘软件产品成为国内业界的一个重要问题。通过引用目前国际通用数据挖掘标准技术来构建开放式的数据挖掘系统模型，该系统模型从可扩展性、可重用性、易用性等方面得到了加强。