Large Diameter Oil Crushed Stone Gravel Combined Drill And Its Technology Study

With the development of civil engineering in China, bored pile foundations in China's roads, railways, ports, power, civil engineering and other fields enjoy a wide range of popularity. But in gravel strata, because of hole collapse, existing equipment has a limited effect on the ground breaking, drilling gravel formation drilling therefore becomes the bottlenecks affecting the progress of construction.Through extensive research in this article related to domestic and foreign large diameter drilling in gravel strata on the basis of documents, existing drilling equipment and construction technology, and engineering geological characteristics of gravel strata, from both large diameter drilling machinery and pore-forming technology study them in detail are analyzed and summarized.By absorbing the achievements of predecessors, analysis of energy transfer losses, calculation of oil pressure, pump and other related parameters, the combined oil crushed stone works for feasibility, and oil crushed stone rock advantages into full play, casing wall protection maintenance hole wall stability design of combined large-diameter oil crushed stone working principle and structure of oil distribution agency, bit map. And based on the engineering geological characteristics of gravel strata, select compatible with drilling, overcome the challenges of large-diameter gravel strata to footage, significantly improve the efficiency of large diameter drilling in gravel strata. On the premise of ensuring security, reduction of construction time, reduce costs, improve the quality of drilling, create a better social and economic benefits.Application and practice in the future continues to be optimized, improved in the process, practice, and improve, constantly improving, and finally developed into a field of the advanced drilling to solve practical problems in the future work, promote the development of large diameter drilling equipment and technology in China.