Yangzhou Dilong YD2000 Rock Pipe Jacking Machine has been successfully deployed for a pipe jacking project in Chongqing and completed all jacking works. Featuring the extreme working condition with an excavation depth of 86 meters for the foundation pit, the project set a national record for the deepest launching shaft for pipe jacking at that time. It fully demonstrates the outstanding performance and industry-leading technical strength of our rock pipe jacking equipment in handling ultra-deep and highly challenging extreme working conditions.
The Chongqing project presented extremely demanding construction conditions. The launching shaft foundation pit reaches an excavation depth of 86 meters, representing a rarely seen ultra-deep pipe jacking scenario nationwide. Ultra-deep foundation pit construction is characterised by high water and soil pressure, complex underground working environment and great difficulties in equipment installation and launching. Extremely stringent requirements are imposed on pipe jacking equipment in terms of structural strength, sealing performance, tunnelling stability, attitude control accuracy and overall pressure-bearing capacity. Conventional pipe jacking equipment cannot adapt to such ultra-deep extreme working conditions, making the project one of the most challenging undertakings in the industry.
To tackle the special construction challenges of the 86-meter ultra-deep launching shaft, our YD2000 Rock Pipe Jacking Machine exhibits remarkable adaptability to extreme working conditions. With specially reinforced structures and optimised sealing systems, the machine can effectively adapt to the high-pressure environment inside ultra-deep foundation pits and delivers stable pressure resistance and reliable underground operability. Equipped with a precise attitude regulation system, it maintains stable tunnelling attitude under complex deep-shaft conditions and effectively avoids risks including axis deviation, equipment disturbance and sealing failure induced by ultra-deep construction, fully meeting the high-standard technical specifications for jacking from ultra-deep launching shafts.
Throughout construction, the YD2000 Rock Pipe Jacking Machine operated stably with excellent pressure resistance and controllable tunnelling attitude. It successfully completed the whole construction workflow including equipment lowering, assembly and commissioning, launching and jacking within the ultra-deep foundation pit. Construction proceeded safely and smoothly with compliant quality, effectively overcoming difficulties associated with launching from an ultra-deep shaft and accomplishing this high-difficulty project, renewing the national record for the maximum depth of pipe jacking launching shafts.
The successful completion of the ultra-deep foundation pit project in Chongqing fully verifies the stability and reliability of the YD2000 Rock Pipe Jacking Machine under ultra-deep foundation pit and extremely complex working conditions, highlighting the core competitive advantages of our pipe jacking equipment in high-end, high-difficulty trenchless projects. The national record for the deepest pipe jacking launching shaft set by this project accumulates valuable practical experience for domestic ultra-deep foundation pit pipe jacking construction, fills the application gap of long-distance tunnelling from ultra-deep shafts in the industry, and provides mature and reliable equipment solutions for domestic underground pipeline projects under similar extreme working conditions.