Blog-Chenxing supplier of shield machine cutterhead sealing brushes

2025/12/24

Multiple sensitive areas to be traversed with stringent protection requirements: The tunnel boring machine (TBM) needs to sequentially pass beneath National Highway 318, the Changhu-Shen Class III waterway, the historic Qitang Canal Heritage Area, and the World Cultural Heritage Site of Nanxun Ancient Town. During construction, settlement and vibration must be strictly controlled. At the same time, leveraging the “Quan Zhiyun” intelligent monitoring and early-warning system, real-time monitoring of both the tunnel structure and its surrounding environment will be conducted to ensure the safety of cultural relics and scenic-area buildings. Significant geological and construction technical challenges: The tunnel passes through predominantly silty clay, silty clayey soils, and粉土 layers, with overburden thickness ranging from only 6.2 to 17.9 meters. This presents technical difficulties such as launching and receiving in extremely shallow overburden conditions and tunneling along tight-radius curves. The project employs an 11.7-meter-diameter slurry shield TBM, which addresses the stability issues associated with long-distance tunneling in soft ground by dynamically adjusting excavation parameters and precisely calculating cutterhead pressure.

Section 3, South Line of the Hangzhou North Ring Road - Tianmushan Road Improvement and Renovation Project

2025/12/24

Section 3, South Line of the Hangzhou North Ring Road - Tianmushan Road Improvement and Renovation Project

High difficulty in geological adaptation to the surrounding environment: The southern route is located in the central urban area and passes through a mixed geological formation comprising soft, silty soil and portions of hard rock. At the same time, it runs in close proximity to dense urban buildings. During construction, it must also be coordinated with the renovation of the Zhonghe Elevated Ring-North Interchange and the reconstruction and restoration of non-motorized vehicle bridges—tasks that place extremely high demands on construction accuracy and the protection of nearby facilities. Significant pressure from pipeline and traffic coordination: The section includes the construction of a 174-meter-long parallel ramp on the south side, and the surrounding area is densely packed with underground pipelines. During construction, it is necessary to simultaneously coordinate pipeline relocation and traffic diversion. This requires not only avoiding multiple power, communication, and other pipelines but also minimizing disruptions to the flow of traffic on major thoroughfares such as Tianmu Mountain Road and North Ring City Road, making traffic management particularly challenging.

Section 2, North Line of the Hangzhou Ring City North Road - Tianmushan Road Improvement and Renovation Project

2025/12/24

Section 2, North Line of the Hangzhou Ring City North Road - Tianmushan Road Improvement and Renovation Project

High Construction Risks in the Core Urban Area: The project section is located in the Wulin Square commercial district, where buildings are densely packed and underground utility lines are intricately intertwined. The project involves relocating 13 power circuits of 35 kV and above, as well as 55 circuits of 10 kV. Additionally, the construction requires passing beneath multiple infrastructure elements, including Metro Line 2, Metro Line 10, and the Guxin River. In total, the project faces dozens of high-risk construction sites, making it extremely challenging to control ground settlement. High Equipment and Construction Difficulties: The transportation, assembly, and installation of the ultra-large tunnel boring machine—measuring 13.46 meters in diameter—pose significant challenges. The equipment bridge alone is 23 meters long and weighs 68 tons. Meanwhile, the project has required coordinating numerous traffic diversions, totaling more than 30 such diversions. During construction, it was essential to minimize disruptions to traffic flow in the city center. Highly Adaptable Construction Method: To address the complex and variable geological conditions along the route, the project innovatively adopted a slurry balance tunneling method. This method enables precise control over ground disturbance during excavation and, combined with advanced construction technologies, achieves an average daily advance rate of 4 meters, ensuring both construction progress and the safety of nearby facilities.

Pearl River Delta Intercity Railway Pazhou Branch Line

2025/12/24

Pearl River Delta Intercity Railway Pazhou Branch Line

High construction difficulty: The section between Pazhou Station and Beigang Shaft represents the first project in China to use a 13-meter-class large shield tunneling machine for tunneling through a complex geological formation with an extremely small curve radius of just 500 meters. At the same time, it achieved the world’s first successful reception of a 13-meter-class large shield tunneling machine using a steel casing, setting a new industry record for the reception of ultra-large-diameter steel casings measuring 14 meters. High risk-control pressure: The core section requires passing sequentially beneath rivers, wetlands, operating subway lines, highways, and other critical structures, involving more than 30 crossings of various risk points in total. Moreover, the project is located in the central business district of Guangzhou, where buildings are densely packed and underground utility networks are highly complex, placing extremely stringent demands on controlling ground settlement and ensuring the safety of surrounding facilities.

2025/12/24

Taiyuan Hub Loop Railway Tunnel

Strong technological innovation: This marks the first time in China that earth-pressure balanced tunnel boring machines have been applied to railway tunnel construction, breaking the limitations of traditional underground excavation methods for railway tunnels. The associated construction technology has been promoted across the entire national railway network by China State Railway Group, filling a significant gap in both research and application within the domestic field of large-diameter earth-pressure balanced tunnel boring machines. High geological and risk-control challenges: The tunneling route includes a 2,200-meter section characterized by a layer of coarse-grained pebbles with high content, where the largest pebble diameter exceeds 600 millimeters. At the same time, the tunnel must pass through 64 potential risk sources—including major urban thoroughfares, rivers, historic buildings, and residential structures—and the tunnel is buried at a depth of only 8 to 25 meters, placing extremely stringent demands on surface settlement control. Ultimately, the construction process managed to keep the maximum surface settlement within 10 millimeters.

Hangzhou North Ring Road Underground Passage

2025/12/24

Hangzhou North Ring Road Underground Passage

Record-breaking Construction of an Ultra-Shallow, Large-Diameter Shield Tunnel: This project marks Hangzhou’s first urban tunnel constructed using the large-diameter shield method. The cutterhead diameter of the shield machine employed in this project reaches 11.3 meters. Even more exceptional is that the shield’s launch point is just 3.4 meters above ground—a condition that ranks among the world’s rarest examples of ultra-shallow burial, placing extremely high demands on excavation accuracy and surface settlement control. Meanwhile, the tunnel’s maximum designed gradient reaches 5.5%, and the ground conditions at both the shield’s launching and receiving ends feature highly permeable strata with abundant groundwater, further complicating the construction techniques. Dense Crossing of Sensitive Structures: During construction, the tunnel must consecutively pass beneath several high-risk areas, including the Dong River, Tiesha River, the Shanghai-Hangzhou Railway, the Zhanlongkou Underpass, and the Bazi Bridge over the Dong River. High Coordination Challenges in Downtown Construction: The project route runs through numerous residential areas—including the Shuixingge Community and Zhanlongkou New Village—along with a dense network of underground pipelines. In addition to adopting phased construction methods and temporarily removing portions of the segregated pedestrian and bicycle green belts and bus stops, the construction team must also carefully manage the impact of construction noise and dust on nearby residents.

Hangzhou Metro and Phase III of Rail Transit Line 1

2025/12/24

Hangzhou Metro and Phase III of Rail Transit Line 1

Hangzhou’s First Metro Tunnel Under the Qiantang River—Built as Hangzhou’s first large-diameter shield tunnel crossing the Qiantang River, and also the city’s first single-tunnel, double-track metro tunnel to span the river—this project has accumulated crucial experience for future metro tunnel projects that cross the Qiantang River in Hangzhou. With a large cross-section featuring an outer diameter of 11.3 meters and an inner diameter of 10.3 meters, the tunnel design breaks through conventional metro tunnel construction standards. The construction poses extremely high risks and challenges: the tunnel must pass beneath the Qiantang River, along with major embankments on both the north and south banks, oil pipelines, and the Xiaoshan Nanyang Oil Depot—several high-risk structures. The geological strata encompass a variety of complex formations, including silty clay, clay,粉砂 (silt), and gravel-bearing layers. Among these, the 800-meter-long “old clay” layer becomes significantly more viscous when exposed to water, greatly increasing excavation difficulty. Meanwhile, the tunnel’s lowest point is buried at a depth of 34.3 meters; this ultra-deep burial combined with high groundwater pressure makes the tunnel prone to issues such as face instability. Additionally, an innovative disaster prevention and evacuation technology combining lateral smoke extraction with longitudinal ventilation has been adopted, eliminating the need for an intermediate ventilation shaft in the middle of the river. This approach not only reduces costs but also minimizes construction risks.

Hangzhou Xiangji Temple Road West Extension Project

2025/12/24

Hangzhou Xiangji Temple Road West Extension Project

High ecological and cultural preservation requirements: The tunnel passes beneath the World Heritage site section of the Beijing-Hangzhou Grand Canal, with the historic Doudou Road district located upstream nearby. The area also features culturally protected buildings such as the ancient Xiangji Temple Pagoda. During construction, measures were taken—including excavating at a depth of about 10 meters below the riverbed and reinforcing the Xiangji Temple Pagoda with ground-based supports—to both preserve the scenic beauty of the canal and ensure the safety of the protected cultural heritage sites. The construction presents significant technical challenges: This project marks Hangzhou’s first-ever shield tunneling operation using a large-diameter machine with an exceptionally small curve radius. The tunnel’s minimum curve radius is just 500 meters—far lower than the standard 600-meter curve radius typically seen in 11-meter-class shield machines. Moreover, the project requires closely passing alongside multiple buildings and dealing with the complex conditions of twin-tunnel shield driving under the canal, placing extremely high demands on the control of tunneling parameters.

2025/12/24

Zhoushan Lujiashi Submarine Tunnel

Geological construction risks are prominent: The tunnel boring machine (TBM) launch section has a minimum burial depth of only 6.2 meters, making it an ultra-shallow buried tunnel. The geological strata consist primarily of highly plastic, low-bearing capacity silty clay, which easily leads to issues such as TBM nose-down and uplift of tunnel segments. Additionally, the tunnel needs to pass beneath drainage boards and the Lujiashi seawall, crossing two areas where piles have been extracted. In the seawall section, PVC drainage boards penetrate the tunnel by 3 to 4.1 meters, posing a significant risk of entanglement with the cutterhead blades. This project is a benchmark transportation project within the province: it is Zhejiang Province’s first highway tunnel constructed using a shield tunneling method beneath the seabed.

Dalian Metro Line 5: Subway Tunnel Between Railway Station and Suoyuwan South Station

2025/12/24

Dalian Metro Line 5: Subway Tunnel Between Railway Station and Suoyuwan South Station

This project represents the world’s first large-diameter shield tunnel constructed in karst geology beneath the sea. The tunnel must traverse a 1,538-meter-long section characterized by highly developed karst features, where thousands of sinkholes of varying sizes are distributed, with the largest cavity reaching a height of 29.8 meters. At the same time, the tunnel must also contend with hard rock formations whose maximum compressive strength reaches 118 megapascals. Moreover, the tunnel faces a maximum hydrostatic head pressure of 0.5 megapascal—a high-pressure environment that poses significant challenges to the tunnel’s sealing and pressure-resistance capabilities. During shield tunneling, the tunnel will pass under several critical infrastructure facilities, including the Shugang Railway, Heizui Port, and Xianglu Reef Navigation Channel. Additionally, the surrounding area is marked by complex geological formations such as weathered zones and fault zones. It is essential not only to avoid any adverse impacts on these facilities during construction but also to address the difficulties in maintaining precise tunnel alignment caused by the uneven distribution of soft and hard strata.

2025/12/24

Bo'ao Tunnel

Geological construction poses high risks due to the complex geological conditions in the construction area. The confined water head in the gravel layer at the bottom of the working shaft’s excavation pit fails to meet the requirements for resisting sudden water bursts. Along the route, chaotic and irregularly distributed boulders are found within the overlying silty and sandy strata, and numerous hidden ponds remain filled with uncleaned backfill. Moreover, the tunnel section contains self-contained biogas pockets; in certain localized areas, gas reservoirs with large gas volumes and high gas pressures may develop, posing multiple threats to construction safety. As a key project for transportation support during the Asian Games, the tunnel is located between the Qianjiang Third Bridge and the Qingchun Road Cross-River Tunnel, connecting two major new urban centers—Qianjiang New City and Qianjiang Century City. Upon completion, the tunnel will enable commuters to cross the river from the north bank to the south bank in just three minutes, significantly enhancing connectivity and efficiency between the two sides of the Qiantang River and providing crucial support for traffic management during the Asian Games.

Changde City Huanjiang River Crossing Tunnel (PPP Project)

2025/12/24

Changde City Huanjiang River Crossing Tunnel (PPP Project)

The geological conditions pose significant construction challenges. In the tunnel section driven by shield machines, a full-face layer of gravel and pebbles stretches for as much as 3,000 meters. The largest gravel stones exhibit a compressive strength of up to 73 megapascals—exceeding the hardness of certain types of rock—and are highly abrasive, placing extremely high demands on both the cutter tools of the shield machine and the tunneling technology itself. As a benchmark for the localization of equipment technology, the “Yuan’an” is China’s first large-diameter, atmospheric-pressure, slurry-balanced shield machine capable of replacing cutterheads under normal pressure. It is a key project under the nation’s “863” Major Science and Technology Special Program and boasts completely independent intellectual property rights. Its successful application marks that China’s manufacturing of underwater shield tunneling machinery and construction technologies in complex geological conditions have reached world-class advanced levels. Moreover, it represents China Railway Construction Corporation’s first major livelihood project integrating surveying and design, equipment manufacturing, construction, and operational management into a single integrated undertaking.

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Contact Information

Address: No. 1 Tongsheng Road, South Area, Industrial Park, Gu'an County, Langfang City, Hebei Province

Phone: +86 3165927222

Email: chenxing@cxtunnel.com

Fax: +8603165927333

Mobile: +8615333366444

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