The Application Research Of The Rotating Drill In The Pile Foundation Construction In DalianArea

At present, the rotating drill has become the main force of pile foundation construction in China’s bridge construction.The rotating drill are not only widely used in high iron construction, in the municipal bridge, highway bridge pile foundation construction in also get a wide range of application, it achieved very good results, so that construction can obviously improve, the speed of construction cost greatly reduced, the construction quality is obviously improved. At present, Due to the rotating drill it is only by a large number of applications in recent years, our country is lack of the corresponding product standards, not prepared the rotating drill construction standard,and no systematic research methods, so the rotating drill that application of the basic theory research remains to be further.The paper first introduces the rotating drill of the basic components and the rotating drill hole pile construction of the basic working principle, the rotating drill different components in the operation function and role; The paper through the study of different kinds of rock physical properties and chemical composition, and analysis the rock mechanics properties and mechanical effect, and research of rock drillability and its influencing factors.This paper mainly studies the rock under external force broken three basic theory(" compact nuclear "theory," leap forward type "rock crushing theory, free surface rock crushing theory),and analyzes theoretically the rotating drill into rock mechanism. And analyzes the rotating drill into the rock in the process of rock applied static load and dynamic load and dynamic coupling loading under the action of stress principle, in order to further study the rotating drill in different intensity rock construction methods, and provides theoretical basis. This paper from engineering geological drillability, the rotating drill pipe selection, the rotating drill bit selection and different geological conditions and the rotating drill the selection of construction methods and so on four aspects introduces the rotating drill in different formation pore forming construction methods of the compilation basis.Finally, this paper to Dalian Gannan Road and Qinan Road BT project for bored pile construction as the backing, standard in the region for a hard rock in weathering limestone formation, through choosing south car group TR360D and TR400C2sets of different types of the rotating drill, through technology and combining than previous formation drilling pile construction experience, pile diameter is2.2m bored pile as the research object, has formulated the6kinds of test pile scheme. Through the analysis of two sets of different schemes according to drill into the hole the technical parameters and economic indicators, the rotating drill in the formation by different methods and the advantages and disadvantages of the construction, and comprehensive consideration of the engineering quality, safety and time limit for a project and cost and other factors, and finally determine the engineering drilling pile construction scheme, then forms the rotating drill in the rock drilling pile construction construction methods.