共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
为探索航道维护施工中耙吸挖泥船艕带泥驳工艺应用的可行性及工效,以某回淤量较大的深水航道为例,在结合工程实际选择疏浚工艺的基础上进行了不同疏浚方式工效的计算与比较;进而对包括船舶选型、艕靠、挖泥装驳、离泊等在内的工艺要点展开分析,对耙吸船装驳施工工效、作业条件及经济效益进行分析总结。分析过程及结果可为深水航道疏浚维护提供借鉴参考。 相似文献
5.
滨州港3万吨级航道工程土质具有颗粒细、密实、极硬等特点,绞吸船施工该土质时,存在绞刀电机电流波动幅度大、正刀施工容易跑刀、横移锚容易走锚、生产率较低等问题。为有效解决上述问题,通过对比分析绞吸船不同绞刀形式、调整挖掘进尺、优化施工关键参数、查找排泥管线额外阻力等方法,使绞吸船绞刀电机电流波动幅度下降,改善了正刀施工容易跑刀现象,横移锚不再走锚,生产率提高了约15%,节约施工成本的同时也缩短了工期。 相似文献
6.
在分析评价长江口不同疏浚吹填工艺的特点及适用性的基础上,结合疏浚土资源供需关系和圈围工程现状条件,提出"十三五"期长江口深水航道疏浚土造地利用的初步技术方案。结果表明:1)长江口航道常用的"挖运抛+挖吹"和"挖运吹"工艺仅适用于较短运距的疏浚吹填工程;新研制的"耙吸装驳"工艺能适用于长运距的疏浚吹填工程,"十三五"投入应用后可显著拓展深水航道疏浚土的利用空间。2)"十三五"期间,横沙东滩七、八期圈围工程可利用深水航道北槽段疏浚土,采用"挖运抛+挖吹"和"耙吸装驳"的"挖+运+吹"工艺实施疏浚吹填;南汇东滩圈围工程N1库区可部分使用深水航道疏浚土,采用"耙吸装驳"工艺实施吹填;其他零星建设用地圈围工程可使用深水航道南港圆圆沙段疏浚土,采用"挖运吹"工艺吹泥上滩。 相似文献
7.
8.
重型绞吸船多为上、下双耳轴设计,使用下耳轴时最大挖深普遍达到35 m左右。当今世界最大的绞吸船极限挖深达到45 m,绞吸船开挖岩石使用下耳轴时受到最小挖深的限制,采用普通横移锚抛锚方法会造成横移缆在坡顶边缘反复摩擦引起缆绳断丝、断股,因此需要寻求一种新的抛锚方式,防止这种情况的发生。通过研究耳轴自行更换方案,采用现场试验和计算的方法,总结出一套上下耳轴快速切换、并采用横移锚抛开锚加浮桥的施工工艺。采用该施工工艺进行深槽基岩开挖,生产效率大幅提高,顺利、高效地完成了基槽开挖任务。 相似文献
9.
10.
针对钦州港东航道扩建工程中耙吸挖泥船施工存在水深不足、施工效率低等问题,采用抓斗船绞吸船联合施工工艺,通过抓斗船疏浚后由泥驳将疏浚土装运至蓄泥坑抛卸,再由绞吸船将其二次吹填上岸.结果表明,该工艺有效规避了水深不足的安全风险,并通过半幅施工半幅通航措施,降低了施工对航道通航的影响,提高了施工效率和经济效益,可为类似工程提... 相似文献
11.
《船舶与海洋工程学报》2014,(1):126-126
正San Francisco,California,June 8-13,2014.OMAE 2014 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;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field. 相似文献
12.
《船舶与海洋工程学报》2014,(2)
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. 相似文献
14.
联合作战计划和执行系统 总被引:2,自引:1,他引:1
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。 相似文献
15.
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. 相似文献
16.
《船舶与海洋工程学报》2014,(1)
正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014. 相似文献
17.
《船舶与海洋工程学报》2014,(2)
正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas. 相似文献
18.
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). 相似文献
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
19.
Gunnar Alexandersson Staffan Hultén Frode Longva 《Research in Transportation Economics》2010,29(1):212-218
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. 相似文献