The Longfeng Avenue project in Tongzi County starts from Liaoyuan North Road (Tongzi County Civic Fitness Center) and ends at the intersection of Heping Road and Fengming Road, with a total length of approximately 3.073 kilometers, including a 280-meter-long Maoshan Tunnel. The entire road is 24 meters wide with four lanes allowing for two-way traffic, designed for a speed limit of 40 kilometers per hour.

　　The Longfeng Avenue project aims to improve the urban road network structure. Once completed, the travel time from Liaoyuan North Road to Fengming Road will be reduced to about 5 minutes, effectively alleviating traffic pressure in the county and making travel more convenient for residents. This project is crucial for promoting regional economic development and urbanization.

　　The LanHi LDJ400A Multifunctional Tunneling Machine is specifically designed for non-explosive tunnel excavation. It utilizes high-frequency hammers or breakers to impact and break rocks, or uses bucket teeth or rod wedges to crush rocks, while also utilizing the gravity below the surrounding rock to automatically break rocks. This machine can be operated locally or wirelessly controlled and is suitable for excavating tunnels with diameters ranging from 6 to 9.5 meters.

 　　It integrates functions such as high-frequency rock breaking, rapid excavation in soft soil, profile trimming, and spray dust removal, suitable for construction in areas where blasting is restricted, such as airports, residential areas, and wildlife reserves. This machine is highly adaptable, capable of handling various types of surrounding rocks, and can reduce excessive or insufficient excavation, as well as prevent collapse and other issues.

　　The Li Jiawan Tunnel Road Project is located in Binjiang New Town, Jiangjin District, Chongqing Municipality. It starts at Songlin Road and extends north to the planned Level 10 Road level crossing, with a total length of 505 meters. The tunnel has two bores, each with three lanes, totaling 265 meters in length and 36 meters in width, making it a major urban thoroughfare. Once completed, it will better improve the urban construction and transportation infrastructure of Jiangjin District, greatly facilitating the travel of surrounding residents, effectively alleviating the transportation difficulties for residents, and significantly improving the quality of life for surrounding people.

　　The LanHi Multifunctional Tunneling Machine is a specialized equipment used for tunnel excavation. It primarily uses high-frequency hammers or breakers to break rocks, or utilizes bucket teeth or rod wedges to crush rocks, while also leveraging the gravity below the surrounding rock to automatically break rocks. This machine can be operated through local control or wireless remote control and is suitable for excavating tunnels with diameters ranging from 6 to 9.5 meters. It integrates functions such as high-frequency rock breaking, rapid excavation in soft soil, profile trimming, and spray dust removal, suitable for construction in areas where blasting is restricted, such as airports, residential areas, and wildlife reserves. This machine exhibits strong adaptability, capable of meeting various rock construction requirements while also minimizing issues such as over-excavation, under-excavation, and collapse.

　　In August 2023, the excavation of the Li Jiawan Tunnel began. In October 2023, the project continued tunneling work, with the investment completion rate exceeding 91%. By March 25, 2024, both bores of the Li Jiawan Tunnel project were successfully connected.

　　Since the start of the project, the engineering department has organized and arranged meticulously, overcoming adverse factors such as the flood season, high temperatures, narrow sites, and discontinuous construction periods. While ensuring safety and quality, efforts were made to ensure the rapid progress of the construction, successfully achieving the milestone objectives of this phase.

　　The Shazi Gou Tunnel in the Fomen Township of Gaoping District connects the Songjiagou Tunnel and the Wanjiagou Bridge, serving as a vital transportation hub. This tunnel is divided into two lines, with lengths of 1075 meters and 1085 meters respectively, making it the first bidirectional long tunnel in the entire project.

　　The Chengnan Expressway Expansion Project is currently the largest and longest expansion project in the province, directly connecting Chengdu and Nanchong, serving as a major transportation artery. Among them, both the Shazi Gou Tunnel and the Shengxing Tunnel are categorized as weakly gassy tunnels and construction began in September 2022 and March 2023 respectively. Recently, the left tunnel of the Shazi Gou Tunnel and the left tunnel of the Shengxing Tunnel were both successfully penetrated on the same day, marking significant progress in the tunnel project and laying the foundation for the project's opening.

　　The surrounding rock of the Shazi Gou Tunnel mainly consists of fine sandy mudstone, with poor mechanical properties and low stability, making construction prone to problems such as collapse, roof caving, water leakage, deformation, and cracking, posing significant construction challenges and safety risks. The project leader explained that during the construction process, the construction unit implemented a series of measures to address these issues, such as adopting standardized construction methods including short advance drilling, weak blasting, rapid closure, and frequent measurements, and introducing intelligent mechanized equipment such as arches and anchors to accelerate tunnel construction progress. Additionally, by installing a tunnel access control monitoring system and a safety information monitoring and alarm platform, control over the construction process was strengthened, significantly reducing safety risks.

　　The LanHi LDJ400A  multifunctional tunnel boring machine is specifically designed for non-explosive excavation in tunnels. Its working principle involves using high-frequency hammers or hydraulic breakers to impact and fracture rocks, or using bucket teeth or rod wedges to break rocks, while utilizing gravity beneath the surrounding rock to automatically crush rocks. This machine employs local control and wireless remote control methods, suitable for excavating tunnels with diameters ranging from 6 to 9.5 meters. It features high-frequency rock breaking, rapid excavation of soft soil, profile finishing, and spray dust removal, making it highly suitable for construction in restricted blasting areas such as airports, residential areas, and wildlife protection zones. Its adaptability allows it to handle various types of surrounding rocks while minimizing over or under excavation and occurrences of collapses.

LanHi helps the construction of 11 standard projects along the Yangtze River Expressway!