Abstract:Present situation of constructing technique of large diameter hollow pile is outlined. Based on investigation and analysis and using underground continuous wall technology for reference, a new type of annular hole drilling tool is presented. The structure, working principle, applying condition, and constructing procedure of the new drilling tool are elaborated in this paper.

Abstract:Ground settlement is discussed based on relevant conclusion of rheologic property of soil with intrinsic time theory in this paper. Calculating formula of variation of ground settlement with time is given and tested and verified. Comparison between the formula provided in the paper and other existing typical formulas of ground settlement indicates that the formula in this paper has higher precision.

Abstract:Using the lowtemperature (at the roomtemperature) electroplated technique to produce thermocompression impregnated diamond bits, that is to say, the impregnated diamond segments are set in the bit body, and then on the surface of them electroplate a layer of diamond composite coating, making them to be combined with the bit body and preventing diamond from the second heathurting for sliverwelding, and meanwhile the diamond bit has the advantage of good regulation of matrix property and well maintenance inside and outside diameter gage. This kind of bit has been received favorably by users.

Abstract:Multimedium reverse circulation composite drilling technique is a new geological drilling method effectively combined air reverse circulation continuous sample with hydraulic reverse circulation core drilling. Features of the technique, research course and field application as well as trial are discussed in detail.

Abstract:Based upon cavity effect of explosive, researching and manufacturing a tool breaking erratic in well and combining with wallscraper drilling resolved large diameter well completion technology in erratic stratum and improved drilling efficiency from several times to dozens times and quickened the speed of well completion. Principle, structure and application results of tool breaking erratic in well, and feature and points for attention of well completion process combined drilling and blasting are introduced in the paper.

Abstract:Based on pipe laying principle and penetrating soil mechanism of pneumatic piperammer, pipe laying features of piperammer in various strata are analyzed, and rammingability classification of strata is presented in this paper. Pipe laying process, rammer selection, pipe laying precision, grout lubricating and other applications of pneumatic piperammer are introduced.

Abstract:Communication pipe playing construction case with trenchless horizontal directional drilling technology in KaifengLuoyang express highway was studied. Field drilling experimental data were analyzed. That the borehole track of horizontal directional drilling is arc is concluded. Calculating formula of borehole arc curvature radius and inlet elevation angle assuring borehole outlet exactly are induced. Main technological points of horizontal directional drilling are summarized in the paper.