Ship Maintenance and Repair Services in the Tema Drydock and Shipbuilding Yard in Ghana: Some Challenges, Opportunities and Prospects

This article explored existing policies (if any) and current management structure which govern operations within the yard, examine some major challenges facing the ship maintenance and repair services in Tema Drydock and Shipbuilding Yard, Ghana, identified few drivers that impact positively on the ship repair market with particular reference to the Tema Shipyard. It concludes by proposing sustainable management and maintenance strategies for improved repair services of the yard as well as analyzing the findings obtained in the data presentation and discussion sections during the research project. The main finding is that the PSC Tema Shipyard’s ship maintenance and repair services are really overwhelmed with major challenges, representing 55% after summing up four (4) out of the seven (7) captured in the study and are threatening its sustainability, if not properly researched and addressed once and for all. As already stated, carefully analysed conclusions were drawn to effectively address these challenges, followed by suggestions for future research to forestall its cascading effects on the Ghanaian economy as a whole.

沉管隧道管节预制方法综述

沉管隧道工法是水下隧道建设的主要工法之一。文中对混凝土沉管管节预制的几种主要方法进行了简单介绍,总结了各自特点,并介绍了采用各种方法的典型工程案例。

浅谈巨型总段造船法

巨型总段造船法是韩国近几年采用的几种新造船方法的基础和代表,它可以方便地与平地造船法、浮船坞造船法结合使用,具有提高造船效率和产量、减少投资费用、较快形成产能等优点。本文主要介绍了巨型总段造船法的特点、发展历程、应用现状、相对于大型分段造船法的创新突破,以及巨型总段的运输、吊装、精度控制等相关设备和技术。

自升式钻井平台水下检验代替坞检实践与认识

自升式钻井平台水下部分检验是船级社法定检验项目,在海.上进行水下检验代替坞检,可以减少进坞费用,节约检验时间,是经济高效的检验方法。该文以“勘探六号”平台用水下检验代替坞检为例,阐述了“勘探六号”平台实施水下检验的程序,分析和总结了本次水下检验的经验和教训,提出了对今后类似平台进行水下检验的建议,可为今后类似海上装置进行水下检验作业提供借鉴。

关于大型造船坞设计的初探

论述了大型造船坞的主要工艺设计要素。

易淤船坞推水式清淤装置的水动力数值仿真研究

地处长三角地区的修船厂,沿岸海水的含沙量大,每次船舶进出坞都会造成较严重的坞内泥沙淤积,若采用传统高压水冲洗清淤方法,会因耗时较长而影响船坞使用效率。开展易淤船坞高效水动力清淤的数值仿真研究具有较好的实际工程应用价值。该文根据高含沙水体基本特性,基于光滑粒子动力学法和非牛顿沙相流变模型,考虑运动推板与积水和沉沙间的联动作用,实施推水式清淤装置对易淤船坞水动力清淤效果数值仿真研究。系统分析折弯角度等结构参数对折线形推水板的清淤面积、体积、速率、推板阻力及单位功率清淤体积的影响。研究表明,推板的推动作用可有效促进板前高浓度流质以波浪形式向外侧扩散,推水式水动力清淤方法可大幅提高水体的携沙能力,促进淤沙随水体迅速排出船坞,有效解决了船坞的快速清淤问题。直推水板具有最佳清淤效果,但其消耗功率亦最大;100°折弯角度的折线形推水板具有95%以上的有效清淤面积,且单位功率清淤体积高于其他推板,是适合船坞清淤的折线推水板构型。