12.5-meter deep channel preliminary conditions for navigation in the lower reaches of the Yangtze River (map)

Pictured, AVIC II in what builders are installing large trapezoidal hollow Member beat photo
CNS, Wuhan, April 8 (reporters Xu Jinbo and and and)-8th reporters learned from the traffic Department of the Yangtze River, after nearly 2 years of comprehensive improvement of building, Yangtze River Nanjing, Nantong to 12.5 metres deep channel was about to enter the acceptance stage, now possess a certain amount of navigation conditions, the 50,000-ton ships can reach the port of Nanjing.
According to reports, the transport of freight traffic on the Yangtze River is the world's largest and busiest navigable river. In recent years, as the country "along the way", the strategies have been implemented, such as the construction of the Yangtze River economic belt, as the water channels and areas along the Yangtze River skeleton construction of the Yangtze River mainstream waterway of the integrated transport system by the national attention.
According to the "Twelve-Five" phase of the overall advance of the Yangtze Golden waterway construction programme, Yangtze River in Nanjing the following in accordance with the "overall plan, implemented in phases, from the bottom up, through prior to poor" governance thinking, implement the 12.5-meter deep channel construction phases. Among them, the first phase of construction of the project started in August 2012 July 2014 completion, achieve Taicang to Nantong section of channel depth of up to 12.5 m-building goals.
　　

Pictured here, the first digging long arm machine leveling job over photo
In June 2015, started the second phase of the 227 km long, after nearly 2 years of comprehensive renovation and construction, through the Yangtze to Nanjing Nantong navigation section implementation of key control project or channel regulation project and combining dredging and maintenance measures, realizing 12.5 metres below the deepwater channel construction in Nanjing, the current project has entered the closing stages.
"Channel construction regional near continues, security management challenge big; flow both deep and urgent, construction difficulty big, precision to control; construction construction forms, engineering volume big, but construction time limited (flood shutdown),", 8th, in Yangtze River yizheng waterways world industry Chau project standard paragraph, in the make two airlines Council Yangtze River deepwater channel II period engineering project manager Zhang Peisheng said, the standard paragraph in II period engineering of most upstream, depth flow urgent, exists with series of construction construction problem.

Pictured, yizheng waterway regulation engineering of the Yangtze River section of the way he beat photo
Just sub project tenders, Chau Tau in the engineering regulating structures including breakwater, Chau Tau breakwater South-North dike, groin on the right margin, Zuo Cha bottom band and Bank protection and so on. Projects need to lay soft mattress 1.346 million square meters, RIPRAP 1.564 million cubic metres of sand-bagged 178,800 cubic metres of Foundation bed leveling 1595 square ladder-shaped hollow unit prefabrication and installation of 319.
For the early completion of 12.5 meters deep water channel, to promote economic development along the Yangtze River, AVIC II in Project Builder and give full play the power of science and technology through research and development, technological innovation to overcome a series of problems. Chief Engineer introduced Yao Ping, for construction of regional water flow needs, water pollution, poor working conditions, control is difficult, traditional construction methods to ensure the quality of construction. Project Department has introduced a new kind of sonar detection techniques, and apply a type 3900 side-scan sonar and multi-beam echo sounder, visualization and construction of water hidden under control.
Foundation bed leveling is the key process of engineering construction, directly determines the overall progress of the implementation of the project and the quality of the components are installed. Leveling of the project depth of 18 meters, velocity, not manual leveling, traditional levelling ship is high cost, long construction time, or does not satisfy the conditions and so on, are not suitable for leveling operation of this project. Project Department and multidisciplinary experts, boldly attempting to dig long arm machine and 3000 tons barge combined, the use of domestic equipment manufacturing and advanced technology of measurement and control, was developed based on the Beidou navigation system underwater automatic leveling system for bed. The leveling system of excavator by manual operation automatic operation, solution manual operation problems of underwater leveling accuracy cannot be guaranteed and artificial leveling of leveling efficiency ratio increased, for domestic initiatives, and so on.
To in project construction process in the protection Yangtze River ecological, in the make two airlines Council project Department established environmental led group, and has ship oil recycling qualification of units signed oil water treatment service agreement, each week regularly collection ship garbage, and waste oil wastewater; and design units carried out ecological groin research, in groin set has ecological type groin, in guarantee original regulation effect of based Shang, will traditional throwing dam modified into more hole type hollow component, manufacturing artificial fish nest, improved water in the biological of survival environment; for should construction ship spill oil of risk, Project Department regularly carry out oil spill prevention environmental emergency exercise, equipped with emergency boats. Project start date, good for environmental protection, without the occurrence of any environmental incidents and environmental complaints.

Pictured, yizheng waterway regulation engineering of the Yangtze River section of the way he beat photo
On March 31, with the last ship completed stone filled, second Harbour Engineering Bureau section construction in completed, now 9 months earlier than originally planned to complete the task.
Yangtze River shipping administration officials said Nanjing 12.5 metres below the deepwater channel of the Yangtze River project is to implement State "along the way" strategy, building the Yangtze River economic belt, making the Golden waterway of Yangtze River project, China's inland water transport the largest and most complex State projects. Project involving the Yangtze River reaches a total length of about 280 km and 6 instability of the River through the Yangtze River waterway improvement and realization of Yangtze estuary channel butt seamlessly with deep-water channel in Nanjing, 50,000-ton ships can reach the port of Nanjing, a 100,000-ton ship might ride the tide and above load arrived.
According to estimates, Nanjing 12.5 metres below the deepwater channel of the Yangtze River after pass early, will play a significant economic and social benefits. Along the port's throughput average annual increases of about 130 million tons, directly along the business logistics cost 2.3 billion yuan. Annual marine fuel consumption savings of 216,000 tons, a corresponding reduction in carbon emissions of about 650,000 tons. While deep water coastline resource utilization can be improved, and further develop the Yangtze River water transport, less pollution, low cost, small footprint, and other advantages.
(Editors: Zhu Pengying UN603)
2017-04-08 20:55:17
China News Network

长江下游12.5米深水航道初步具备通航条件(图)

图为，中交二航局建设者正安装大型梯形空心构件 何战胜 摄
　　中新网武汉4月8日电  (徐金波 隋业辉 何战胜)记者8日从长江航务部门获悉，经过近2年综合整治建设，长江下游南通至南京12.5米深水航道即将进入验收阶段，目前初步具备了一定的通航条件，5万吨级海轮可直达南京港。
　　据介绍，长江目前是世界上货运量最大、运输最繁忙的通航河流。近年来，随着国家“一带一路”、建设长江经济带等战略相继实施，作为中国水运主通道和沿江地区综合运输体系主骨架的长江干线航道建设受到国家高度重视。
　　根据“十二五”期长江黄金水道建设总体推进方案，长江南京以下按照“整体规划、分期实施、自下而上、先通后畅”的治理思路，分期实施12.5米深水航道建设。其中，一期工程2012年8月开工建设，2014年7月竣工投产，实现太仓至南通河段航道水深达到12.5米的建设目标。
　　

图为，国内首创长臂挖机整平作业 何战胜 摄
　　2015年6月，全长约227公里的二期工程正式开工，经过近2年的综合整治建设，通过对长江南通至南京碍航河段实施关键控制工程或航道治理工程，并结合疏浚维护等措施，初步实现南京以下12.5米深水航道的建设目标，目前工程已经进入收尾阶段。
　　“航道建设区域靠近主航道，安全管理挑战大；水流既深且急，施工难度大，精度难以控制；建设施工形式多样，工程量大，但施工时间有限(汛期停工)等”，8日，在长江仪征水道世业洲项目标段，中交二航局长江深水航道二期工程项目经理张培生说，该标段处在二期工程的最上游，水深流急，存在着系列的建设施工难题。

图为，长江航道整治工程仪征标段铺排 何战胜 摄
　　仅仅世业洲项目标段，其工程整治建筑物包括洲头潜堤、洲头潜堤南北侧丁坝、右缘丁坝、左汊护底带以及护岸等组成。工程需要铺设软体排134.6万平方米，抛石156.4万立方米，袋装砂17.88万立方米，基床整平1595平方米，梯形空心构件预制及安装319件。
　　为早日建成12.5米深水航道，促进沿江经济发展，中交二航局项目建设者充分发挥科技的力量，通过科研开发、技术创新攻克了系列难题。项目总工姚平介绍，针对施工区域水深流急，江水浑浊，工况条件差，施工控制难度大，传统施工方法难以保证工程施工质量。项目部引进了新型的声呐实时检测技术，并应用了3900型旁扫声呐和多波束测深仪，将水下隐蔽施工做到可视化和可控化。
　　基床整平是工程建设的关键工序，直接决定项目整体进度的实现和构件安装的质量。本工程整平水深达18米，流速大，无法采用人工整平工艺，传统的整平船存在造价高、建造时间长或不满足现场工况条件等问题，均不适合本工程整平作业。项目部及专家多方论证，大胆尝试将长臂挖机和3000吨驳船结合起来，利用国内装备制造和测量控制的先进技术，成功开发了基于北斗导航系统的水下抛石基床自动化整平系统。该整平系统将挖机由人工操作变为自动化操作，解决了人工操作水下整平精度无法保证的难题，且整平工效比人工整平大幅提高，为国内首创等等。
　　为了在项目建设过程中保护长江生态，中交二航局项目部成立环保领导小组，与具有船舶油污回收资质的单位签订油污水处理服务协议，每个星期定期收集船舶垃圾、废油废水；与设计单位开展生态丁坝研究，在丁坝设置了生态型丁坝，在保证原有整治效果的基础上，将传统抛石坝改成多孔型空心构件，制造人工鱼巢，改善水中生物的生存环境；为应对施工船舶溢油的风险，项目部定期开展防溢油环保应急演练，现场配备了应急船只。工程开工至今，现场环境保护良好，未发生任何环保事故及环保投诉事件。

图为，长江航道整治工程仪征标段铺排 何战胜 摄
　　3月31日，随着最后一船石料抛填完成，中交二航局工程标段建设全部完工，至此比原定计划提前了9个月完成任务。
　　长江航务管理局相关负责人表示，长江南京以下12.5米深水航道建设工程是落实国家“一带一路”战略要求、建设长江经济带、打造长江黄金水道的重点项目，是中国内河水运投资规模最大、技术最复杂的国家重大工程。工程涉及长江河段全长约280公里，通过对长江6个河势不稳定的水道进行整治，实现长江口航道与南京以下深水航道无缝对接，5万吨级海轮可直达南京港，10万吨级及以上海轮也可乘潮减载抵达。
　　根据测算，长江南京以下12.5米深水航道初通后，将发挥显著经济社会效益。沿江港口吞吐量平均每年可递增约1.3亿吨，直接降低沿江企业物流成本23亿元。每年可节约海运油耗21.6万吨，相应减少碳排放量约65万吨。同时还可提高深水岸线资源的利用率，进一步发挥长江水运的运能大、污染小、成本低、占地少等优势。
(责任编辑：朱鹏英 UN603)
2017-04-08 20:55:17
中国新闻网