The expressway from Zhangye to Wenchuan is an important fast road connecting Zhangye City in Gansu Province and Wenchuan County in Aba Prefecture, Sichuan Province. It is also part of China's National Expressway Network from Beijing to Lhasa.

　　The Saierlong No. 1 Tunnel is located in Saierlong Township, Henan Mongolian Autonomous County, Huangnan Tibetan Autonomous Prefecture, Qinghai Province. It is a separated dual carriageway tunnel, with the left line measuring 840 meters and the right line 793 meters. Construction of the tunnel began on May 24, 2022.

　　The geological conditions of the Saierlong No. 1 Tunnel are quite complex, with surrounding rocks prone to looseness and fragmentation, high soil moisture content, and high risks of collapse. To ensure project quality and construction safety, all participating units continuously optimized processes and methods, strictly controlled safety production, detailed safety measures, and completed the full line tunneling on schedule.

　　The LanHi LGM312C intelligent arch anchor integrated trolley adopts an engineering chassis and is equipped with a single anchor rod system. The entire machine features four-wheel steering, four-wheel drive, and bidirectional driving functions, with a dual power system of diesel and electric, electric construction, and diesel emergency backup. With three-arm remote control, it meets the requirements for prefabricated arch frame installation, various step-by-step operations, and arch frame positioning adjustments. During arch frame installation, it can handle excavation and welding operations, demonstrating strong adaptability to tunnel conditions.

　　The LanHi LGM312U intelligent integrated arch anchor trolley features an engineering chassis and is equipped with a single anchor system. The machine features four-wheel steering, four-wheel drive, two-way driving and other functions. Its diesel-electric dual power system supports electric construction and diesel-powered emergency operations. The three-arm remote control can meet the requirements for prefabricated arch frame installation, operation of various benching methods and precise positioning adjustment of the arch frame. The arch frame can handle under-excavation and welding operations during installation, and the tunnel itself is very flexible.

　　In the early morning of August 8, 2023, the left line of the Saierlong No. 1 Tunnel on the G0611 Zhangye to Wenchuan Expressway project was successfully completed. Subsequently, on September 14, the right line was also successfully completed, marking the completion of the dual-line construction of the tunnel.

　　The Yuku High-Speed Railway is part of China's national "Eight Vertical and Eight Horizontal" railway network, and the Laifu Tunnel is a double-track tunnel in the Sichuan-Chongqing section of the Yuku High-Speed Railway, with a total length of 4616 meters. This tunnel is located at the junction of Xuzhou District in Yibin City and Gao County, with mostly low mountains and large undulations, and a maximum burial depth of approximately 314 meters. 

　　The geological strata traversed by the tunnel are mainly mudstone interlayered with sandstone and sandstone interlayered with mudstone, and the tunnel also passes through one fault of the Fojie Mountain, one goaf area, and two fractured zones, with numerous rock fissures. Facing challenges such as coal seam gas, goaf areas, and gradients, this is a challenging project.

　　On September 12, 2021, construction officially started on the Laifu Tunnel of the Yuku High-Speed Railway Sichuan-Chongqing section Station Front Lot Six. China Railway Third Engineering Bureau undertook the construction task and introduced various large-scale mechanical equipment, including multifunctional drilling rigs, rock breaking trolleys, and arch assembly trolleys, to cope with the complex geological conditions.

　　The LanHi Intelligent Drilling and Arch Integrated Trolley is suitable for full-section and step-by-step tunnel construction. It adopts a sturdy integrated chassis engineering platform equipped with dual rock drilling arms and a stand, with features such as four-wheel steering, four-wheel drive, and bidirectional driving. It is easy to operate, with low failure rates and high reliability, effectively improving the efficiency and safety of tunnel construction.

　　The large-scale mechanized construction of the Laifu Tunnel has achieved normalized operations, providing valuable experience for improving the level of railway tunnel construction, overcoming quality issues, reducing construction costs, and enhancing safety.

　　The Dazhou Beltway West Expressway project is one of the beltway loops around 18 prefecture-level cities in Sichuan Province, providing a fast connection between various development clusters in the Dazhou urban area. On September 26, 2022, important projects such as the Anyun Hub Interchange and the Xianpodeng Tunnel of the Dazhou Beltway Expressway officially commenced construction.

　　The Xianpodeng Tunnel is located in Shixiahu Village, Shuanglong Town, Tongchuan District, and is one of the key projects of the west section of the beltway expressway. The tunnel has a maximum burial depth of 202.5 meters, with a length of 2864 meters for both the left and right lines. The net width of the tunnel is 10.75 meters, and the net height is 5 meters. The entrance of the tunnel is located in a landslide area, crossing two water diversion tunnels, and the surrounding rocks are classified as Grade IV and V. The tunnel type is a small net distance + separated long tunnel, with extremely complex geological conditions and poor surrounding rock properties.

　　The LanHi intelligent integrated drilling and arch trolley is a dual rock drilling and vertical arch integrated trolley that meets the needs of tunnel full-section construction and the benching method. The machine features a rigid integrated frame engineering chassis and dual rock drilling arms. The standing arch frame features a dual arm design, with three grippers and two hanging baskets. It provides four-wheel steering, four-wheel drive, and two-way driving, and supports electric construction and dieselpowered emergency response. It is easy to operate, has a low failure rate, high reliability, compact structure and convenient maintenance.

　　At 9:00 a.m. on March 26, 2024, construction of the Xianpodeng Tunnel on the west section of the Dazhou Beltway Expressway officially commenced. Currently, the right line of the tunnel has smoothly entered the tunnel, and the excavation face construction has been fully initiated, while the left line has already excavated 256 meters.

　　The Chengnan Expressway is a 215-kilometer highway connecting Chengdu and Nanchong. It starts from the Nanchong Dongguan interchange, passing through Hanjiawan, Gaoping, Jialing, Pengxi, Tangjia, Daying, Cangshan, Huaikou, Qingquan, and finally connecting to the Chengdu Ring Expressway at the Luosiban interchange. The entire road is constructed according to highway standards, including two 1482-meter twin-tube tunnels and three extra-large bridges totaling 4344 meters in length.

　　The Songjiagou Tunnel is located in Qinglian Village, Dangliang Street Office, Bazhou District, with a total length of 815 meters. It passes through various formations such as mudstone and sandstone, presenting complex geological conditions. The tunnel mainly passes through alternating layers of mudstone and sandstone in the Lower Cretaceous Bai Long Formation, with nearly horizontal bedding and relatively tight structure.

　　LanHi's LG312M intelligent arch integrated trolley integrates multiple processes such as measurement point setting, under-excavation operation, arch installation, welding mesh, and connecting bars. It can complete the excavation and arch installation of a double-track tunnel without moving. The entire vehicle adopts an engineering chassis, with a dual-power system of diesel and electricity, a bidirectional cab structure, good driving performance, and adaptation to various complex tunnel road conditions. The arm uses wireless remote control and manual control operation, making it easy to control the movement of the mechanical arm, with features such as speed, efficiency, and energy saving.

　　The Chengnan Expressway expansion project started in September 2022 and is expected to be completed and opened to traffic by 2025.

　　The expressway from Lin'an to Jinhua in Zhejiang, abbreviated as Linjin Expressway, starts at the border of Zhejiang and Anhui, called Qianqiuguan, which is a major road connecting these two provinces. This road passes through Lin'an, Tonglu, Jiande, and finally reaches the Jiande section of Hangzhou Xinjing. This section of the road is 85.5 kilometers long, with a designed speed of 100 kilometers per hour. Once completed, it will greatly shorten the distance from central and western Zhejiang to Hangzhou, and also serve as a new passage for the northern Lixi region.

　　Because it is a highway built in mountainous areas, there are a total of 70 bridges and 30 tunnels on Linjin Expressway. Among them, Yinggong Tunnel is the longest mountain highway tunnel in Hangzhou. The tunnel on the right is 4412 meters long, and the one on the left is 4452 meters long, making it the longest tunnel on Linjin Expressway. Due to the long length of the tunnel passing through the mountain, ventilation, drainage, dust reduction, and other works are very difficult during construction.

　　In order to ensure the smooth progress of this project, Hangzhou Transportation made advance plans and supervised and guided the project team to develop scientific construction plans. At the same time, people working on Yinggong Tunnel actively responded to the call of Linjin Expressway and introduced some advanced mechanical equipment, such as double-arm rock drilling platform carts, waterproof board laying platform carts, and arch bridges. They have created a mechanized construction assembly line from excavation to support, improving construction efficiency.

　　The LanHi LCG312A multi-functional platform is a device that integrates functions such as steel arch installation, welding mesh and connecting bars, and excavation surface measurement. This equipment uses a car chassis, so it can move and relocate flexibly to deal with various situations, with high efficiency. Its three arms adopt remote control for the middle arm and local remote control for the side arms, enabling simultaneous operation. This not only reduces labor costs and construction risks but also achieves the standardization and industrialization of tunnel arch erection.

　　On January 17, 2022, an important part of Linjin Expressway—Yinggong Tunnel was successfully penetrated, marking the completion of the main line of Linjin Expressway.

　　The Sichuan Along-the-River Expressway starts from Xinshi Town in Yibin City and extends to the Jinjiang Interchange of G5 Beijing-Kunming Expressway on the east side of Panzhihua City. This route passes through four world-class hydroelectric stations and crosses several strong seismic fault zones. There are 219 bridges on the route, including 37 extra-large bridges, and 93 tunnels, including 35 particularly long tunnels.

　　The Qingping Tunnel No.1 is located in Qingping Yi Autonomous Township, Pingshan County, Yibin City, with a total length of 2616 meters, and is a two-way four-lane separated tunnel. The terrain and geological conditions of this tunnel are extremely complex. The rocks inside the tunnel are mainly carbonaceous mudstone and medium sandstone, with some coal seams interspersed. These rocks have poor cohesion, are thinly layered, and pose a high risk of gas control, making construction very difficult.

　　The Qingping Tunnel No.2 is also located in Qingping Yi Autonomous Township, Pingshan County, Yibin City, with a total length of 1634 meters, and is also a two-way four-lane separated tunnel. The terrain and geological conditions of this tunnel are similarly complex. The terrain at the entrance of the tunnel is extremely steep, with a slope of up to 80 degrees and a height difference of nearly 100 meters. The construction process requires traversing more than ten winding gravel roads from the provincial road to the construction site, with local slopes reaching 16% and a vertical rise of nearly 200 meters. The entrance road is very steep. The gravel soil at the entrance of the tunnel is loose, and the space of the construction platform at the entrance of the tunnel is extremely limited, making the site conditions very harsh. Inside the tunnel, there are mainly strongly weathered sandstone, karst filling material, and gravel soil, with many large karst caves and a daily water inflow of up to 13,000 cubic meters, posing high construction difficulty and safety risks.

　　The LanHi LDG312A intelligent arch frame integrated trolley adopts a lightweight design solution, with light weight and small size. The trolley integrates multiple processes such as measurement point setting, under-excavation operation, arch frame installation, welding mesh, and connection bars, and can complete the excavation and arch frame installation of a double-line tunnel at one go without moving the machine. The whole vehicle adopts an engineering chassis, diesel-electric dual-power system, bidirectional driving platform structure, good driving performance, and can adapt to various complex tunnel road conditions. The boom adopts wireless remote control operation, which is easy to accurately control the action of the mechanical arm and has the characteristics of fast, efficient, energy-saving, and safe.

　　The Chongqing-Kunming High-Speed Railway, abbreviated as the Chongqing-Kunming High-Speed Rail, is a rapid railway connecting Chongqing and Kunming, passing through Sichuan, Guizhou, and Yunnan. It spans approximately 698.96 kilometers, with 21 stations along its route, and has a design speed of 350 kilometers per hour.

　　The Zhaotong Tunnel is part of the Chongqing-Kunming High-Speed Railway, stretching approximately 16.2 kilometers, including a 4.2-kilometer section through coal seams. The third horizontal shaft of this tunnel is located in Suoye Village, Luozhe River Town, Yilang County, Zhaotong City, Yunnan Province, at an altitude of about 1700 meters. The climate here is cold and humid, with more rainy days than sunny ones throughout the year, making construction conditions extremely challenging. The geological formation primarily consists of limestone, with abundant underground karst water resources.

　　The LanHi LGM312U intelligent integrated arch anchor trolley features an engineering chassis and is equipped with a single anchor system. The machine features four-wheel steering, four-wheel drive, two-way driving and other functions. Its diesel-electric dual power system supports electric construction and diesel-powered emergency operations. The three-arm remote control can meet the requirements for prefabricated arch frame installation, operation of various benching methods and precise positioning adjustment of the arch frame. The arch frame can handle under-excavation and welding operations during installation, and the tunnel itself is very flexible.

　　Construction of the Chongqing-Kunming High-Speed Railway in the Chongqing and Sichuan sections began on September 29, 2019. By February 20, 2022, the first horizontal shaft of the Zhaotong Tunnel achieved smooth breakthrough. As of February 2024, excavation of the Zhaotong Tunnel has exceeded 7 kilometers, with the third horizontal shaft expected to enter formal excavation by the end of April. The Chongqing-Kunming High-Speed Railway's Chongqing-Sichuan section is scheduled to be completed and opened to traffic by the end of 2024.

　　The Yun-Kun High-Speed Railway is a high-speed railway connecting Chongqing and Kunming in Yunnan Province. It spans nearly 700 kilometers, with 21 stations and a design speed of up to 350 kilometers per hour. Construction of the Yun-Kun High-Speed Railway began on September 29, 2019, in the Chongqing and Sichuan sections, and the Yunnan section officially commenced on December 20, 2019.

　　The Junlian Tunnel in the Chongqing-Sichuan section of the Yun-Kun High-Speed Railway is being constructed by China Railway Eighth Bureau and is located at the border of Junlian County in Yibin City, Sichuan Province, and Yanjin County in Yunnan Province. This is a single-hole double-track tunnel with a total length of 7,888 meters, featuring one crosscut divided into two working areas with three construction faces. The longest excavation face measures approximately 4,015 meters, with a total construction period of 43 months.

　　The Junlian Tunnel is a challenging engineering project along the entire railway line, passing through the Datianba anticline area. The geological conditions here are extremely complex, with karst landforms, coal seam gas, rock strata under pressure, and high ground stress, among other adverse geological conditions. As a result, the construction difficulty is significant, with high safety risks.

　　The LanHi intelligent integrated arch anchor trolley adopts an engineering chassis and is equipped with a dual anchor system. The machine features four-wheel steering, four-wheel drive, two-way driving and other functions. Its diesel-electric dual power system supports electric construction and diesel-powered emergency operations. The threearm remote control can meet the requirements for prefabricated arch frame installation, operation of various benching methods and precise positioning adjustment of the arch frame. The arch frame can handle under-excavation and welding operations during installation, and the tunnel itself is very flexible.

　　As of June 12, 2023, the excavation work of the key Junlian Tunnel in the Chongqing-Sichuan section of the Yun-Kun High-Speed Railway has surpassed the milestone of two kilometers, completing 29% of the total length.

　　The Westward Extension High-Speed Railway, abbreviated as the Westward Extension High-Speed Rail, is a high-speed railway connecting Xi'an and Yan'an. The line starts from the north end of Xi'an East Station, passes through a series of cities and regions, and ultimately extends to Yan'an New District Station. With a total length of approximately 291.7 kilometers and a total investment of 60 billion yuan, it is designed for a speed of 350 kilometers per hour.

　　The New Yan'an Tunnel is an important tunnel on the Westward Extension High-Speed Railway, with a total length of 16 kilometers, making it the first long tunnel to be completed along the entire line. It is located between Baota District in Yan'an City and Ganquan County, and is a single-bore double-track tunnel. Due to its location in the loess hilly and gully region, the geological conditions are complex, making it one of the tunnels with the highest safety risks and construction difficulties on the Westward Extension High-Speed Railway.

　　The LanHi LGM312H intelligent integrated arch anchor trolley adopts an engineering chassis and is equipped with a dual anchor system. The machine features four-wheel steering, four-wheel drive, two-way driving and other functions. Its diesel-electric dual power system supports electric construction and diesel-powered emergency operations. The threearm remote control can meet the requirements for prefabricated arch frame installation, operation of various benching methods and precise positioning adjustment of the arch frame. The arch frame can handle under-excavation and welding operations during installation, and the tunnel itself is very flexible.

　　On December 9, 2024, the New Yan'an Tunnel of the Xi'an to Yan'an High-Speed Railway was successfully completed. This milestone event marks that 50% of the tunneling along the entire Westward Extension High-Speed Railway has been completed, laying a solid foundation for the timely opening of the railway.

　　The BaoYin High-Speed Railway connects Baotou City in Inner Mongolia Autonomous Region with Yinchuan City in Ningxia Hui Autonomous Region. This is China's first high-speed railway connecting two autonomous regions of ethnic minorities. The railway stretches from Baotou Station to Yinchuan Station, with a total length of 519 kilometers and 13 stations, designed for a speed of 250 kilometers per hour.

　　The Gandershan Tunnel is the only tunnel project on the BaoYin High-Speed Railway and is one of the key projects in the entire project. It has a total length of 12,095 meters and is a double-line long tunnel, with a maximum burial depth of about 294.4 meters. This tunnel is constructed by China Railway Tenth Group Co., Ltd. The geology of Gandershan Mountain is complex, with varied terrain, including mountainous ravines and dense fault structures. The tunnel crosses 17 fault fracture zones, and the overall stability of the surrounding rock mass is poor. It is also close to the remains of the Qin and Han Great Wall. It must pass through lead mine goaf areas and a national-level Four-Unity Wood Nature Reserve, making construction highly risky and difficult.

　　The LanHi LGM312H intelligent arch anchor integrated trolley adopts an engineering chassis, equipped with a double anchor rod system. The whole machine has functions such as four-wheel steering, four-wheel drive, two-way driving, diesel-electric dual-power system, electric construction, and diesel-driven emergency operation. The three-arm remote control meets the requirements of prefabricated arch installation, various benching operations, arch positioning adjustment, and can handle excavation and welding operations during arch installation, showing strong adaptability to tunnel construction.

　　On April 29, 2023, the first incline well of the Gandershan Tunnel, undertaken by China Railway Tenth Group, successfully reached the top. The plan is to complete the entire tunnel's penetration by December 2024 and lay the ballastless track by May 2025.