The NPD4000 slurry balance pipe jacking machine has been successfully applied to the construction of the Henan Section of the Yangtze-to-Huaihe Water Diversion Project, a major national water conservancy infrastructure project. Equipped with super-large diameter tunneling capability and a stable slurry balance control system, the equipment fully meets the high-standard construction requirements of super-large diameter trenchless projects, providing solid equipment guarantee and technical support for the smooth progress of this national key water diversion project.
Project Overview
As a landmark strategic water conservancy project in central and eastern China, the Yangtze-to-Huaihe Water Diversion Project undertakes vital functions including optimal allocation of water resources, water ecological restoration and improvement of regional water systems. As an important part of the whole project, the Henan Section focuses on the laying of super-large diameter water conveyance pipelines, which puts forward extremely high requirements for pipe jacking equipment performance, tunneling stability and construction safety, with construction standards far exceeding conventional municipal pipe network projects.
Construction Scale and Project Characteristics
To meet the laying demands of large-scale water conveyance pipelines for the Yangtze-to-Huaihe Water Diversion Project, customized super-large specification jacking pipes are adopted in the construction, with an inner diameter of 4 meters and an outer diameter of 4.8 meters. During the construction period, the supporting NPD4000 slurry balance pipe jacking machine was the largest specification slurry balance pipe jacking equipment of its kind in China at that time. The construction of super-large diameter pipelines involves complex working conditions with great difficulties in tunnel face pressure control, tunneling accuracy management and stratum stability control, requiring professional large-diameter trenchless equipment to ensure efficient, safe and standardized construction.
Equipment Advantages and Construction Value
The NPD4000 slurry balance pipe jacking machine has demonstrated excellent working condition adaptability in the super-large diameter pipeline construction of the Henan Section of the Yangtze-to-Huaihe Water Diversion Project. The equipment realizes precise slurry pressure regulation and stable tunneling propulsion, effectively ensuring project quality and stratum stability during the construction of 4.8-meter outer diameter pipelines. The successful application of this domestically produced super-large specification slurry balance pipe jacking machine fully verifies the high-end manufacturing strength and super-large diameter construction technology level of domestic trenchless equipment, accumulating valuable practical experience and mature construction schemes for subsequent large-scale water conservancy and super-large diameter pipe jacking projects in China.