Abstract:n order to speed up innovation of foundation construction equipment and technolgy the first thing is to introduce advanced foundation construction equipment and technology for these purpose. Relevant practice and experience are presended in conjunction with introduction of advanced equipment and technology in the company.

Abstract:escription is put on functions and parameters of GT wireless detector and GP-drill for drilling trenchless borehole mating test of them in trenchless pipeline installation technique, good performance has been got.

Abstract:ased on analysis of the first stage of the market aim for bored pile drill development and of the features of foreign auger drills, several views are presented on type selection of the domestic drill development,especially technical parameters and down-hole tools matching.

Abstract:A description is given to the survey of part of the foreign drill rig modular design and the use of the method in the enterprise. The drillrig of modular design offers modularity and can further meet the different demands of the market. For production with many sizes of products but on a small commercial scale, adoption of the modular design and management, in combination with grouping technology and CAD, can reduce the design and production cycle of the product, allowing the enterprise to gain economic benefit similar to that of commercial production.

Abstract:he authors have made an all-round, systematical study on the adaptability of the A. C. drive system, which consists of asynchronous electrical motor and frequency converter to the geological drill in the case of modelling rotation and hoisting. The experiment results indicate that the A. C. drive system provides a wide speed adjusting range, good drive performance, frequent starting under load; and many optional functions such as control of max. torque, setting up of speed-increasing or reducing time. It also has high performance reliability and high efficiency. Used with drill, it can simplify the drive device of the drilling rig, facilitate optimum and safety drilling; ease automization of the drilling equipment. Therefore, application of the A. C. drive on drillrig provides a good prospect, and is a major subject worthy of further study.