Abstract:Technical parameters, structural features and performance of PZ modular roller cone bit are presented. Theoretical value of the lowest bit pressure and value of highest rotary speed are put forward with the analysis on bit pressure acted on single roller cone, thereby theoretical basis is achieved for the proper use of the bit.

Abstract:All hydraulic multi functional anchor drill consists of angle shift, top drive rotary and feeding mechanisms with hydraulic drive. The overall plan, mechanism design and main parameters of the rig are introduced. The prototype rig shows good results in industrial tests.

Abstract:There are the functional relations among the flow parameters of air in the air reverse circulation drilling piplie, including volume of flow, velocity of flow, pressure and pressure difference which have a great effect on carrying solid phase. It is of significance of quidance to test movement parameters, find their regularity and study movement mechanism of air carrying solid phase during the reverse circulation drilling. The test items and purpose are introduced and the test results are analyzed in this paper.

Abstract:This paper introduces the design and application method of a new simplified steel lining device that applied in tunnel of smaller ratio of height and width This device designed by authors uses lifting mechanisms separately and can be replaced by outer screw jack for satisfying the condition of excavating and lining in a tunnel at the same time The device had been successfully applied in a road tunnel in Zhuji City

Abstract:In this paper, the engineering geological condition of crossing the Changjiang River Tunnel along the Beijing Shanghai high speed railway is studied, and merits and demerits of ground treatment methods of all kinds are checked and compared, and jet grouting plan is put forward

Abstract:According to the engineering geological and hydrogeological and enviromental conditions in jobsite, the selection of groundwater treatment method in foundation pit of Wuhan Changjiang Square is discussed, and the construction technology of curtain grouting as well.

Abstract:This paper discusses mechanism and classification, parameter selection, material selection and mixture ratio of pre-grouting during tunnelling in less or no self stable surrounding rock and presents the application prospect of grouting in engineering.

Abstract:The deviation and pilot drilling mechanism and drilling technology of the horizontal cable bolt hole are analyzed and discussed in this paper The application of the horizontal pilot drilling theory and drilling technology to the cable bolt hole drilling for the perpetual ship gate at the Changjiang Three Gorges achieves good results

Abstract:According to the strata relalionship of the building fundation, soil texture, mechanical properties and characteristics of structural forces, the cost and constructional method are considered. Based on the analysis and comparison between large diameter impact bored hole construction and other methods, basis for the choice of large diameter impact bored pile and calculating method for the design of the typical frictional end supporting pile are described.

Abstract:１概况桩基础是各类建筑物、桥梁、港口、高架路等构筑物的基础形式之一。由于桩深埋于地下，能将上部结构的荷载传到深层稳定的地方，可减少基础的沉降，并有较好的均匀沉降性能及抗震性能因而被大量采用。据９０年代初的不完全统计，我国每年用桩量已超过１００万根，根...

Abstract:In the manufacturing process of PDC rock bits, PDC cutters of the bits will not be negatively affected by high temperature, so that better performance can be expected. This kind of bits has been well received by users.

Abstract:根据钢筋砼的特性，从理论分析结合实践经验合理选择了金刚石钻头的主要性能参数。ＧＷ２号配方对钢筋砼的适用性较好，胎体性能稳定，并选用了粒度为４０～５０目、浓度为４５％的较高品级金刚石与该胎体相匹配，在生产使用中取得了较好的钻进效果。

Abstract:Summary and analysis are made on the design and construction of water well in China with existing problems. Some questions such as completion technique and well pipe corrosion are deeply discussed. In accordance with the practice in China, concrete suggestions are put forward on project design, well pipe selection, anti corrosion, normalization of engineering management and so on.

Abstract:This paper discusses principle of water split by detonating fuse blasting,drilling and blasting parameters for quarrying hard granite, and technology methods enhancing rock material utilization ratio and other application of water split by detonating fuse blasting in the future.

Abstract:The drilling technology on lake is discussed with the conditions and the types of lake floor deposit of Daihai Lake, municipality of Inner mongolia, china The problems, encountered in four typical formations drilled, was solved By evaluating the performance of coring tools, authors made some improving suggestions The drilling process is summarized A simple drilling platform is constructed and the performance of drilling rigs is listed At the end, the further development of lake drilling technology is considered

Abstract:１宝马博览会简介和印象“Ｂａｕｍａ９８博览会”于１９９８年３月３０日～４月５日在德国慕尼黑举行。宝马博览会每三年举行一次。本届是第２５届国际施工机械、建筑材料、施工车辆及设备博览会。这次博览会是在郊区新建的贸易中心进行。新贸易中心一期工程全部完成，包...