DRA series multifunctional casing spiral drilling rig is a new type of drilling rig product with independent intellectual property rights, which is innovatively developed by Shangong Machinery on the basis of absorbing advanced technology at home and abroad. DRA series double power head drilling rig is mainly composed of detachable double power head and electric control system. It is equipped with combination drilling tools such as casing spiral drill pipe and down-the-hole hammer, which can perform multi-functional and multi-purpose construction, especially in pebbles. High-efficiency drilling is completed in complex formations such as boulder layers and hard rock layers. It has the characteristics of regular pile hole diameter, hole wall shape, good quality, high vertical accuracy, and no mud pollution during construction. It is an environmentally friendly new product of pile machinery, which meets the national requirements for energy conservation and emission reduction and green construction. Economic and social benefits and broad market prospects.