Yangzhou Dilong 2800*2600 rectangular pipe jacking machine has officially entered the construction site of the Sichuan Road and Bridge Chengdu Tengfei 6th Road Shuangliu Water Affairs project in Chengdu and commenced underground jacking operations. Boasting excellent adaptability to complex strata, stable overall operation status and precise jacking control capability, the equipment perfectly adapts to the local special pebble stratum conditions, steadily advances project construction and completes scheduled construction tasks with high standards. It fully demonstrates the robust strength of our large-section rectangular pipe jacking equipment in municipal water affairs projects with complex geological conditions.
As an important municipal water supporting infrastructure project in Chengdu, the Sichuan Road and Bridge Chengdu Tengfei 6th Road Shuangliu Water Affairs project plays a vital role in improving the regional drainage system, optimizing the urban water environment and enhancing the bearing capacity of municipal pipe networks. The project features highly complex and unique geological conditions. The stratum crossing consists of cohesive soil and pebbles, with a pebble content of approximately 30-55% and the grain size mainly ranging from 5.0 to 12.0 cm. Such strata are characterised by loose structure, poor cementation and high water permeability, combining the adhesion of clay and the high hardness and wear resistance of pebbles. During construction, common challenges including cutterhead clay bonding, pebble jamming, poor mucking efficiency, tunnelling attitude deviation and stratum disturbance frequently occur. This imposes stringent requirements on the equipment’s rock breaking and impurity removal capacity, anti-blocking and anti-adhesion performance, tunnelling stability and settlement control level.
Targeting the complex geological challenges of cohesive soil and pebble composite strata, the Yangzhou Dilong 2800*2600 rectangular pipe jacking machine presents outstanding adaptive advantages for special working conditions. Specially optimized and upgraded for pebble and cohesive soil composite strata, the machine features a large-section body with high structural rigidity and stable bearing capacity, effectively resisting impact resistance generated by pebble tunnelling. Equipped with an optimized cutterhead structure and an efficient mucking system, the equipment can efficiently break and screen large-diameter pebbles to avoid common risks such as cutterhead jamming and pipe blockage, while alleviating clay adhesion and blockage to ensure smooth tunnelling and mucking. Supported by a precise attitude control system, the machine dynamically adjusts tunnelling parameters in real time, accurately controls stratum disturbance and construction deviation, and fully meets the high-standard construction requirements of local special composite strata.
Throughout the construction process, the Yangzhou Dilong 2800*2600 rectangular pipe jacking machine operated stably with a low failure rate and continuous and efficient tunnelling performance, perfectly adapting to the construction characteristics of cohesive soil and pebble strata. The entire jacking process maintained controllable tunnelling attitude and regular tunnel forming quality, effectively solving common problems in composite stratum construction such as delayed progress, quality deviation and potential safety hazards. With safe, controllable and standard-compliant construction throughout the whole process, the equipment efficiently and high-quality completed the jacking tasks of this municipal water affairs project, fully reflecting its unique adaptive advantages in complex pebble stratum working conditions.
The smooth construction of this Chengdu water affairs project fully verifies the excellent performance and reliable stability of the 2800*2600 rectangular pipe jacking machine in cohesive soil and pebble composite strata. It further enriches the practical application cases of our large-section rectangular pipe jacking equipment in complex geological and municipal water affairs projects in Southwest China, accumulates mature and valuable construction experience for trenchless pipe jacking construction in similar alternating pebble and cohesive soil strata nationwide, and continuously supports the efficient, green and high-quality construction of urban municipal water infrastructure.