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In the context of pipeline reinforcement projects, bored cast-in-place piles have been applied in the Zhang Yuzhong Xiang Xiuping area under Sinopec Xiangfan Petroleum Company, located in Xiangfan City, Hubei Province. This project focuses on improving the structural integrity of an oil pipeline that crosses the Tangbai River, which has experienced significant degradation due to river erosion and sand dredging activities.
The engineering geological conditions reveal that the Wei Jing oil pipeline crossing the Tangbai River is at risk of deformation due to the dynamic forces of water flow and its own weight. According to a hydrological survey report submitted by the Xiangfan City Hydrographic and Water Resources Survey Bureau on August 28, 1998, the pipeline has a maximum suspended height of 1.5 meters, with some sections displaced by up to 0.33 meters. These displacements pose a serious threat to the pipeline’s stability, necessitating reinforcement to ensure continued safe operation.
The construction site is situated along the tributary of the Han River, where the riverbed exhibits significant fluctuations. The northern part of the riverbed consists of coarse sand and gravel, while the southern region contains silt-bearing clay. The strata are divided into six layers within a depth range of 30 meters, with the third layer being particularly suitable as a bearing layer for bored piles due to its high mechanical strength and stability.
Given the challenging conditions, including the presence of large pebbles and unstable soil, the use of steel piles or precast piles would be impractical. Instead, bored cast-in-place piles were chosen for their reliability and adaptability to the site's complex geology. The pile spacing was determined based on the allowable span of the pipeline, while the pile diameter and length were calculated using detailed engineering analysis.
The construction process involved the use of two barges as drilling platforms, anchored in place during the entire operation. Due to the high volume of river traffic, strict regulations were imposed, limiting the pile top to only 0.2 meters above the pipeline level. Most of the work was conducted underwater, presenting additional challenges.
Before commencement, a professional survey team accurately mapped the pipeline’s position and marked the pile locations. A mud retention system was employed during drilling, utilizing positive circulation slag removal to maintain hole stability. Reinforcement cages were fabricated and transported to the site, with special fasteners used instead of welding to facilitate assembly.
Throughout the drilling and pouring process, careful attention was given to controlling drilling speed, maintaining proper mud levels, and ensuring continuous concrete pouring to avoid defects such as broken piles. The protective casing was installed with precision, and all procedures followed established geotechnical and construction standards.
This project highlights the importance of adapting construction techniques to specific environmental and geological conditions, ensuring both safety and efficiency in pipeline reinforcement operations.