How does a long guide rail design improve the axis stability and attitude control accuracy of large-diameter pipe jacking machines during long-distance excavation?
Publish Time: 2025-08-13
In modern urban underground space development and infrastructure construction, trenchless technology has become a key solution to traffic, environmental, and construction disturbance challenges. The large-diameter long guide rail rear soil discharge spiral pipe jacking machine, a high-end trenchless equipment, integrates mechanical, hydraulic, electrical, guidance, and geological adaptability technologies, making it an "underground traverser" capable of traversing complex strata such as roads, rivers, and railways. It not only represents the pinnacle of engineering machinery manufacturing, but also, with its deep system integration and technological innovation, is driving the evolution of urban underground pipeline construction towards greater efficiency, safety, and intelligence.The depth of the large-diameter long guide rail rear soil discharge spiral pipe jacking machine is primarily reflected in its systematic response to the challenges of "large diameter" and "long distance" construction. Traditional pipe jacking equipment often faces challenges such as difficult attitude control, increased frictional resistance, and poor soil discharge when the diameter exceeds 3 meters or the advance distance exceeds hundreds of meters. The equipment's extended guide rail design significantly improves the guiding stability between the main machine and the rear jacking device, effectively dissipating eccentric load stresses during jacking and ensuring millimeter-level axial accuracy even during long tunneling distances. Its large diameter enables the laying of large drainage pipes, utility corridors, or power tunnels in a single operation, avoiding the repeated disturbance of the ground during multiple construction runs, significantly improving project efficiency and structural integrity. This breakthrough in scale is the result of the coordinated optimization of structural mechanics, material strength, and engineering control.The equipment's innovation lies in the design of its core soil discharge mechanism, the rear soil discharge auger. Unlike front-mounted auger conveying or slurry balance systems, the rear soil discharge auger places the auger at the rear or mid-rear section of the pipe jacking machine. The internal auger shaft continuously and stably transports the removed soil from the excavation face to the rear receiving shaft. This layout optimizes the equipment's internal space, reduces the complexity of the front structure, and enhances its adaptability to soft soil, sand, and even gravelly formations. The continuous nature of the auger conveying ensures precise matching of the soil discharge rate and jacking speed, effectively controlling face pressure and preventing ground subsidence or heave. Furthermore, the auger shaft's speed and torque can be adjusted in real time. Combined with earth pressure sensors, this allows for dynamic response to varying geological conditions, demonstrating the advanced level of mechatronic control.Further innovation lies in the integration of an intelligent guidance system and long-distance power transmission. Equipped with high-precision laser guidance or inertial navigation systems, the equipment monitors jacking posture (pitch, yaw, and roll) in real time and automatically corrects deviation by adjusting the thrust distribution of the correction cylinders. This data is transmitted back to the ground control center in real time, enabling operators to accurately assess equipment status and make informed decisions. To address the degradation of hydraulic and electrical transmission associated with long-distance jacking, the equipment utilizes a distributed power unit and high-pressure, long-distance pipelines to ensure consistent power support for the front-end cutterhead, auger conveying, and rear-end thrust systems. Furthermore, the introduction of remote monitoring and fault diagnosis systems further enhances equipment reliability and operational efficiency.The value of the large diameter long guide rail rear soil discharge spiral pipe jacking machine lies in its powerful technical integration capabilities, which solves the "deep, long, large and difficult" problems in urban underground construction. It can safely pass through sensitive areas without disrupting ground transportation and buildings, reducing interference with the environment and residents' lives. Its high precision, high efficiency and high adaptability make it widely used in major projects such as urban drainage system upgrades, underground integrated pipeline corridor construction, and cross-river tunnel leads. This equipment is not only a masterpiece of engineering machinery, but also an important support for the sustainable development of modern cities. With its silent advancement, it is writing the future of infrastructure deep in the stratum, demonstrating the wisdom and power of mankind in controlling underground space.
