“正力3500”顺利完成气囊下水—永泰气囊再创世界纪录
永泰气囊成功助力“正力3500”3万吨级风电安装平台顺利下水2025年4月30日，由上海振华重工集团自主研制、自重高达30,500吨的自航自升式海上风电安装平台 “正力3500” ，在江苏南通采用气囊工法顺利完成下水，创造了气囊下水方式下最大自重船舶的全新世界纪录。该风电安装平台型长143.8米、型宽56.6米、型深13米，配备 3500吨双主钩绕桩式回转起重机，主钩吊高160米、副钩吊高180米，各项性能指标均处于国际领先水平。平台下水后首、尾吃水均为5.0米。
永泰深度参与全流程——从设计咨询到最终下水工程服务作为国内外领先的船用气囊制造商及船舶工程承包商，青岛永泰自“正力3500”开工建造起便深度参与了本次工程：l 与振华重工签订气囊下水技术咨询合同l 提供 82条超高强度高压船用气囊l 承担平台最终下水的全流程工程服务永泰团队与振华重工团队紧密协作，在复杂条件下共同保障了该超大型平台的安全、平稳下水。下水工程的三大技术难点1. 船台改造难度大原船台为滑道结构：长200米、宽80米、坡比20.5:1，设有4条宽1.2米、高0.8米的滑道。为适应气囊工法，永泰团队采用混凝土块及碎石填充分隔区，并在表面铺设沙土并碾压整平，将其改造为适用于气囊下水的斜平面船台。2. 船体结构不利于气囊布置作为自升式平台，其船底设有4个桩靴，桩靴底部比船底面低50厘米；同时平台首部线型瘦削。这些结构特征均大幅增加了气囊布置与受力计算的难度。3. 下水水位不足有限的下水水深需要对气囊布置、船体姿态控制及下水节奏进行精确设计与动态调整。面对诸多难题，永泰技术团队通过现场建模、受力校核、风险评估等多项技术措施，与船厂共同将下水环境优化至最佳状态。同时本次采用的 永泰超级高压气囊安全系数超过8倍，极大提升了下水的冗余度与安全性。再次刷新行业纪录——推动气囊工法迈向更高水平“正力3500”的成功气囊下水，不仅刷新了气囊下水工法所能承载的最大船舶重量记录，更标志着中国在船用气囊制造与工程工法领域继续保持世界领先。气囊工法的发展离不开中国造船业的高速进步，也凝聚了几代中国气囊行业从业者的智慧与努力。中国自主研发的船用气囊技术正在持续改变世界造船方式，并为全球船舶工程领域贡献“中国方案”。永泰将继续以更高标准、更强技术力量服务全球客户，推动气囊工法向更大型、更复杂、更高安全性的方向发展。
QINGDAO EVERGREEN MARITIME Sets a New World Record with Successful Marine-Airbag Launch of a 30,500-Ton Wind Installation PlatformOn 30 April 2025, the self-propelled, self-elevating offshore wind turbine installation platform “Zhengli 3500”, independently built by Shanghai Zhenhua Heavy Industry Co., Ltd. (ZPMC), was successfully launched in Nantong, Jiangsu using Evergreen marine airbags. The platform, with a lightship weight of 30,500 tons, has now set a new world record for the heaviest vessel ever launched using the marine-airbag method.
“Zhengli 3500” measures 143.8 m in length, 56.6 m in breadth, and 13 m in depth. It is equipped with a 3,500-ton twin-main-hook revolving crane, featuring a main hook lifting height of 160 m and an auxiliary hook height of 180 m—performance parameters that place it among the most advanced in its class. After launch, the vessel achieved a forward and aft draft of 5.0 m.Full Technical Involvement from Design Stage to Final LaunchAs a global leader in marine airbag manufacturing and vessel-launch engineering,
QINGDAO EVERGREEN MARITIME played a critical role throughout the entire process:Signing a technical consultancy contract for the airbag launchSupplying 82 ultra-high-strength, high-pressure marine airbagsProviding complete engineering services for the final launch operationEVERGREEN’s engineering team collaborated closely with ZPMC to ensure a safe, smooth, and precisely controlled launch under challenging conditions.Key Technical Challenges of This Launch1. Conversion of the Existing Slipway
The original slipway was designed for skid-based launching:
200 m in length, 80 m in width, and a slope ratio of 20.5:1, featuring four skids (1.2 m wide, 0.8 m high).
To adapt it for marine-airbag launching, EVERGREEN engineered a full modification:Filling gaps between the skids with concrete blocks and crushed stonesLeveling and compacting the surface with sandConverting the slipway into a smooth inclined plane suitable for airbag deployment2. Complex Hull StructureAs a jack-up installation platform, the vessel features four spud cans extending 50 cm below the hull bottom, along with a slender bow section.
Both characteristics significantly increased the difficulty of airbag positioning, force distribution, and launch stability.3. Insufficient Water Depth at LaunchLimited water depth demanded precise control of vessel trim, airbag release sequence, and launch velocity, leaving minimal margin for error.Despite these challenges, EVERGREEN’s engineering team conducted detailed modeling, load analysis, and risk evaluations, optimizing every aspect of the launch conditions. The super high-pressure marine airbags supplied by EVERGREEN featured a safety factor exceeding 8, substantially enhancing overall safety and redundancy for this heavy-lift operation.A Breakthrough for the Global Marine-Airbag IndustryThe successful launch of the 30,500-ton “Zhengli 3500” marks a major milestone in the evolution of marine-airbag technology and sets a new benchmark for the global shipbuilding industry.The rapid development of this technology is driven not only by China’s booming shipbuilding industry, but also by decades of dedication from generations of marine-airbag specialists. China pioneered the development of marine airbags and the airbag-launching method, and continues to promote their application worldwide—offering an innovative and efficient solution for modern shipbuilding and offshore engineering.QINGDAO EVERGREEN MARITIME remains committed to advancing marine-airbag technology and delivering safe, reliable, and cost-effective engineering solutions to clients around the world.
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