【安全誠行】Shenzhong Link – Immersed Tunnel Uncovers Potential of Prefabrication | 世界第一沉管隧道 深中通道突破預製潛能
The digitalisation of China's construction industry is advancing by leaps and bounds. The project team's innovative thinking combined with prefabrication techniques attributes the success of Shenzhen-Zhongshan Link, the world's largest steel-shell concrete immersed tunnel. Ir Albert CHENG, Executive Director of the Construction Industry Council (CIC), visited the tunnel and learnt how the electric smart trolleys, automatic intelligent pouring system and smart site safety system have contributed to the safety and efficiency of this "Project of the Century".
?
Electric Hydraulic Trolley and Intelligent Pouring System
The 24-kilometre-long Shenzhong Link is a world-class cluster of cross-harbour projects with interconnections between islands, tunnels and bridges. It is expected to be commissioned in 2024, which will reduce the travelling time from Shenzhen to Zhongshan from the original two hours to half an hour. The subsea tunnel, which runs from Shenzhen to the Western Artificial Island, has a total length of 6,845 metres. The immersed tube section, which consists of 32 immersed tube sections and one final joint, has a length of 5,035 metres, and is the world's first two-way eight-lane, steel-shelled concrete immersed subsea tunnel.
?
CCCC Fourth Harbour Engineering Co., Ltd. (CCCC4) has years of experience in the construction of immersed tunnels, and has previously been involved in the construction of the Hong Kong-Zhuhai-Macao Bridge project. This time, the project team is welcoming an even larger immersed tunnel project. While introducing the Shenzhong Link, Mr. CHEN Wei-bin, General Manager of the Technical Centre, said, "In every immersed tunnel project, we are improving the effectiveness of prefabrication. When it comes to the Shenzhong Link, the production capacity increases to 40 days for one tube section." He added that this was made possible by the creation of intelligent trolley technology after continuous practice and research.
?
Each intelligent trolley has a loading capacity of 800 tonnes. When the precast steel- shell arrives at the unloading area of the prefabrication factory, 200 sets of trolleys will run simultaneously to deliver it to the intelligent pouring area. By using big data, the system can automatically pour concrete within seconds and control the speed of concrete placement, which is more efficient than traditional pouring machines and can greatly reduce concrete wastage. Each steel-shell concrete immersed tube weighs up to 80,000 tonnes. After prefabrication, the steel-shell concrete immersed tubes will be transported by intelligent trolleys with a carrying capacity of 160,000 tonnes to the shallow dock area of the factory, ready for shipping and installation. The whole process of immersed tube prefabrication is carried out in the factory. Mr CHEN Wei-bin said that efficiency and quality are greatly enhanced, and the working environment is safe and comfortable without the need to be exposed under sun and rain.
"Yihang Jinping 2" Delivers Top Levelling Technology
The Shenzhong Link is a major national project and many different teams have been working on it for years. CCCC4 has been contributing prefabrication technology and different innovative technologies. CCCC First Harbor Engineering Co., Ltd (CCCC-FHEC) has also assisted the project in many ways, including the use of its self-developed "Yihang Jinping 2" to help in the seabed foundation work of the subsea tunnel. "The Yihang Jinping 2" is a self-elevating gravel laying and levelling vessel with a length of 98.7 metres and a width of 66.3 metres, which is close to the size of an international standard football pitch. It is capable of performing tasks such as positioning, pile lifting, gravel conveying and levelling, and quality checking, achieving integrated management throughout the construction process. It is also highly resistant to wind and waves, allowing high levelling speed and accuracy. With the help of "Yihang Jinping 2", levelling work for one standard tube section can be completed in 3 to 4 days.
?
Smart Site Safety System in Action
During his visit, Ir Albert CHENG commended the innovation of the Shenzhong Link, in particular the Smart Site Safety System. For instance, CCCC4 built a smart monitoring hall for the prefabrication factory, which provides an overview of construction processes on screens to effectively manage and ensure safety. CCCC-FHEC also uses smart helmets with BeiDou Navigation Satellite System and front camera to monitor the team's position, safety and health in real time during construction.
?
The main structure of the Western Artificial Island and the Lingdingyang Bridge were also completed in September 2017 and April 2023 respectively. In June 2023, the final joint of the subsea tunnel successfully connected to the last tube segment, bringing this mega project to the final stage. When it opens to traffic next year, it will definitely bring the Greater Bay Area closer together, promote development, and benefit the public in various aspects.
领英推荐
中國建造業數碼化發展一日千里，深中通道的海底沉管隧道早前順利合龍，背後成功之道實有賴團隊將創新思維配合預製技術。建造業議會執行總監鄭定寕工程師親身前往深中通道考察，了解當中的智能台車、智能澆置裝備及安全智慧工地系統，如何為這項「世紀工程」達至安全高效。
?
智能台車及智能澆置
深中通道全長24公里，是「島、隧、橋水下互通」的世界級跨海集群工程，預計在2024年通車，將令深圳往寸中山的車程由原本的兩小時大減至半小時。海底隧道由深圳通往西人工島，總長度6,845米，其中的沉管段由32個管節及1個最終接頭組成，長度為5,035米，更是世界上首個雙向八車道鋼殼混凝土沉管海底隧道。
?
中交第四航務工程局有限公司（中交四航局）有多年建造沉管隧道的經驗，此前亦有份建造港珠澳島隧工程。這次迎來更大型的深中通道沉管隧道工程，技術中心總經理陳偉彬表示：「每一個沉管隧道的工程中，都在推動組件進步和效益，來到深中通道，我們已經達到40天生產一個管節。」他又稱，當中有賴工程團隊經過不斷實踐及鑽研後，創出智能台車技術。
?
每輛智能台車承載力達到800噸，當預製鋼殼到達工廠卸駁區，200組台車會同時運行將它送到生產線的澆置區，並透過智能澆置系統澆置混凝土。系統利用大數據，能夠在數秒內準確地自動定位，並且控制澆置混凝土的速度，效率較傳統澆置機高，更能減少浪費混凝土。每節鋼殼混凝土沉管重量達到8萬噸，完成預製後會由承載力達16萬噸的智能台車，運送到工廠的淺塢區，準備出運安裝。沉管預製全程在工廠施工，陳偉彬總經理表示透過仔細分工，團隊工多藝熟，大大提升效率及及品質，更毋須日曬雨淋，工作環境安全舒適。
「一航津平2」頂尖整平技術
深中通道蔚為國家重大工程項目，多個不同團隊埋首苦幹多年，除了四航局貢獻預製技術及不同創新工藝，中交第一航務工程局有限公司（一航局）亦從多方面協助建設，當中包括使用自家研發、有「海底3D打印機」之稱的「一航津平2」，為海底隧道基礎施工獻一分力。「一航津平2」是自升式碎石鋪設整平船，船長98.7米，寬66.3米，面積接近一個國際標準足球場。「一航津平2」能夠做到定位、拋桩抬升、石料輸送、拋石整平還有質量檢測，施工全程達至一體化管理，而且抗風浪能力高，整平速度快兼精度高，三至四天就能為一個標準管節的完成整平。
?
安全智慧工地系統發揮功效
建造業議會執行總監鄭定寕工程師視察時，亦多次讚賞深中通道的數碼化技術，特別是當中的安全智慧工地系統（Smart Site Safety System，簡稱4S），例如四航局為沉管預製工廠設有智能監控大廳，關鍵工序在螢幕上一覽無遺，有效管理及確保安全。而一航局亦用上智能頭盔，設有北斗衛星定位系統及前置鏡頭，實時監測團隊施工時的位置、安全及健康情況。
?
深中通道沉管隧道已於2023年6月正式合龍，而西人工島早在2017年9月完成主體結構，伶仃洋大橋亦已於2023年4月合龍，意味這項超級工程幾近完成，明年通車後將可拉近大灣區距離，促進各方面發展，做到便民利民。
Sensational ????
Now this is what you call innovation! Sensational. When Isambard Kingdom Brunel was waist deep, tunnelling under the River Thames at Rotherhithe, he would have known that one day, engineers would achieve such remarkable results. ????
"?? ""The secret of change is to focus all of your energy, not on fighting the old, but on building the new."" - Socrates ??? The Shenzhong Link project exemplifies this by transforming construction through prefabrication and digitalisation. ?? By the way, did you know there’s an opportunity to be part of a Guinness World Record for Tree Planting? Imagine amplifying your impact on sustainability! Check it out here: https://bit.ly/TreeGuinnessWorldRecord"
?? "Innovation is taking two things that already exist and putting them together in a new way," Tom Freston once said ?? Your project, Shenzhong Link, is a powerful demonstration of this, merging safety and prefabrication to unlock new possibilities in construction. Keep pushing the boundaries! #Innovation #SafetyFirst ?????♂?
CSO at Guildhawk (UK) & Evernoon (H.K) 尚日（香港) Veteran, BBC commentator, Former Police Director of National Fraud Intelligence
1 年Thank you for sharing