These are the questions that the traditional hole method is unable to be solved,but the pneumatic counter-circulation technology can solve the questions.

Airlift Loop Bioreactor and the Design of Automatic Control System for the Reacror;

According to the technical problems in positive circulation construction,a new derived system of reverse circulation DTH was developed,which has been applied in the construction of water well and alluvial exploration with remarkable effect.

The paper introduced the use of airlifting reverse circulation rotary drilling techniques in practice of major diameter socket pile operation at Xiangfan city s Hanjiang No.

Hole Clearing by air-lift reverse circulation method in bored piles

The application of the air-lift reverse circulation technology to the construction of the deep-drawn pile has the advantages of the high boring efficiency,high quality of hole formation,and impossible occurrence of hole wall collapse accidents in the unconsolidated ground.

The paper introduces the typical examples for resolving these problems by air-lift reverse circulation drilling technology.

This paper introduces the suction principle of the airlift reverse circulation system composed of the air-bag, air-intake pipe and conduct pipe, expounds the design and processing of the suspended air-bag, and describes the application of the air-bag in the underwater pile foundation.

The author has made an exposition of the theory of airlift reverse circulation machines and tools,and its making way as well,which has solved the construction technical difficulty.