Recently, the scientific and technological achievement "Research on Micro-disturbance Control for Construction of Rectangular Pipe Jacking with Variable Slope Undercrossing Water-rich Soft Strata" by the Urban Construction Company of China Railway 15th Bureau passed the scientific and technological achievement evaluation meeting organized by China Railway Construction Corporation, and was rated as reaching the international advanced level.

This achievement was developed in the Yangtze River Avenue Utility Tunnel Project. This project is an important component of the Jiangnan Ring Trunk Utility Tunnel. The pipe jacking construction area is located on the Yangtze River floodplain, where groundwater is extremely abundant. In particular, within 65 meters of the launching shaft, the pipe jacking tunnel passes through silty clay interbedded with silty sand, and the remaining 145.5 meters mainly passes through mucky clay, resulting in complex geological conditions for excavation.

In response to the construction challenges of large-section rectangular pipe jacking crossing dense pipeline clusters in water-rich soft soil geology, the project team actively carried out scientific research. They conducted technological research through multiple approaches including theoretical analysis, modeling verification, laboratory tests, finite element simulation, and on-site verification, covering aspects such as "Key Technology Research on Seepage Prevention Process and Effect Evaluation for Working Shaft Foundation Pits in Water-rich Deep Sand Strata in Riverside Areas," "Research on Construction Technology of Rectangular Pipe Jacking Undercrossing Dense Pipeline Clusters under Water-rich Conditions," "Research on Settlement Control Standards for Rectangular Pipe Jacking Undercrossing Dense Pipeline Clusters under Water-rich Conditions," and "Key Technology Research on Risk and Safety Assessment of Rectangular Pipe Jacking under Water-rich Conditions."

They developed the variable-slope jacking technology for large-section rectangular pipe jacking, proposed a calculation method for variable-slope jacking force, and realized the construction of rectangular pipe jacking with vertical curves, expanding the application scope of rectangular pipe jacking. By studying the components and performance indicators of thixotropic slurry, they proposed the optimal mix ratio and grouting volume for variable-slope jacking, ensuring the smooth implementation of curved pipe jacking. At the same time, they revealed the surface deformation patterns under different jacking slopes and grouting densities, achieving micro-disturbance control for rectangular pipe jacking undercrossing pipeline clusters in water-rich soft soil environments. The evaluation committee unanimously agreed that the research results have significant social and economic benefits and good prospects for promotion.

It is reported that the company attaches great importance to scientific and technological innovation. In 2023, it established a doctoral studio, BIM studio, model worker innovation studio, and expert studio at the Xinyang CAZ Dual-Innovation Industrial Park Project, and regularly holds science and technology forums. Through "going out and inviting in," they continuously improve the level of technical services for construction and production, and transform scientific and technological achievements and innovation results into visible "productivity" and tangible "benefits."