Its biggest characteristic is that after the reinforcement cage is placed in the drilling hole and the conduit is poured, the bottom of the hole can be kept less or no sediment, and there is no need for secondary hole cleaning. It has good slag cleaning effect and less auxiliary equipment, which greatly improves the efficiency of pile formation. The high efficiency of the rotary excavator is brought into full play. This slag removal technology has been used in a number of rotary pile foundation construction sites such as Guoxin Financial Building, Alibaba Building, Aliyun Building and Life Building, and has achieved satisfactory results, which should be vigorously promoted. (6) There are a large number of rotary pile construction teams in Shenzhen, and the number of individuals is large. The performance, management level and operation ability of pile drivers are quite different. They are often hastily started, lack of training, and lack of mastery of rotary pile construction technology and operation skills, especially the mastery of drilling mud performance. It is often difficult to achieve the desired results. Therefore, in the specific operation of secondary hole cleaning, the hole cleaning process should be adjusted according to the actual situation. In particular,down the hole bit, if the drilling tool without mud circulation cleaning process is adopted, its practical application has a high technical content. If the sediment at the bottom of the hole cannot meet the design requirements after placing the reinforcement cage and pouring the guide pipe and before pouring the concrete, the mud positive circulation or reverse circulation must be used for secondary hole cleaning. Return to Sohu to see more Responsible Editor:. wt-dthtools.com