In September 2023, the Yangzhou Dilong 7700 × 4500 rectangular pipe jacking machine (variable 7500 × 4300) officially entered the Shenzhen project site and was successfully put into on-site jacking construction. As a large-size adjustable-section pipe jacking equipment, the machine can flexibly switch between two construction sections of 7700×4500 and 7500×4300 according to actual construction demands. Featuring unique variable-section adaptability, stable overall tunnelling performance and precise attitude control capability, the equipment efficiently adapts to complex urban construction conditions, steadily promotes project progress and completes phased construction tasks with high standards. It fully demonstrates the innovative technical strength of our super-large variable-section rectangular pipe jacking equipment.
Urban underground infrastructure projects in Shenzhen adopt stringent construction standards and face complex working conditions. The urban area features intricate underground pipelines, limited construction space and dense surrounding structures, imposing extremely high requirements on the working condition adaptability, construction flexibility, tunnelling stability and forming accuracy of pipe jacking equipment. Conventional fixed-section pipe jacking machines have single application scenarios and can hardly meet the variable section construction demands of urban projects. Centering on the construction requirements of super-large section tunnels, this project delivers rigorous tests on the equipment’s section adaptation capacity, overall structural strength and continuous jacking stability, representing a high-standard and high-flexibility trenchless construction project in the urban core area.
Targeting the variable construction demands and complex urban working conditions of the Shenzhen project, the Yangzhou Dilong 7700 × 4500 rectangular pipe jacking machine (variable 7500 × 4300) gives full play to its exclusive equipment advantages. Equipped with a self-developed variable-section adjustment structure, the machine can flexibly switch between 7700×4500 and 7500×4300 section sizes according to on-site construction environments and tunnel design parameters. With superior adaptability, it effectively solves the industry pain points of fixed section sizes and limited application scenarios of traditional pipe jacking equipment. Boasting high structural rigidity and stable bearing performance, the equipment is well suited for super-large section rectangular tunnel jacking operations. Combined with a high-precision attitude control system, it optimizes tunnelling parameters in real time and accurately controls tunnel alignment and construction settlement, fully satisfying the high-standard refined construction requirements of urban Shenzhen.
Throughout the construction process, the Yangzhou Dilong variable-section rectangular pipe jacking machine operated smoothly with flexible section switching and a low failure rate. It can rapidly complete section adaptation and adjustment according to on-site construction needs, maintaining controllable tunnelling attitude, regular tunnel forming and stable construction safety throughout the operation. Efficiently adapting to super-large section jacking operations in the narrow-space and complex pipeline environment of urban Shenzhen, the equipment advanced all construction procedures in an orderly manner and completed the trenchless jacking tasks with guaranteed quality, fully highlighting the core competitive advantages of variable-section pipe jacking equipment including flexible adaptability and multi-functional application.
The smooth construction of the Shenzhen project fully verifies the excellent performance and flexible adaptation capacity of the 7700 × 4500 rectangular pipe jacking machine (variable 7500 × 4300) in complex urban working conditions and super-large section tunnel construction. The innovative variable-section design breaks the application limitations of traditional rectangular pipe jacking equipment, further diversifies the engineering application scenarios of our large-section rectangular pipe jacking machines, and accumulates valuable practical experience for the construction of variable-section and large-size underground tunnels in urban core areas nationwide. It continuously supports the innovative and high-quality development of urban underground infrastructure construction.