Abstract:High Pressure swing-jet grouting is a new technique which is developed basing on high pressure directional grouting. Some parmeters and new suggestions of single directional grouting are proposed through investigation, research,laboratory and field tests.These parameters,gained from above tests were used inconsolidating the foundation of a rotay tan house in Datong Coal Mine ,the expected good result was reached.

Abstract:This monitor is equipped with double drum,bicable houble piece and double piece and quardruple corearmored cable and is put down into the hole through the orientation of a double-pulley-racl. Its basic principle is combining uttrasonic distance measuring theory with comprter and comprehensive scientific monitoring technology,to execute quality inspection of large diameter foundation pile hole ;that is to monitor hole diameter,inxlination and the thickness of downhole cuttings sediment.

Abstract:This article analyses the properties and requiremrnts of large diameter rock embedding pile hole ,and believes thas the hard rock embedding pile hole is a difficult problem.Traditional hard rock drilling methods are still being used though they are far from adequate .This article details newly-developed large-diameter wet reverse circulation closed hollow DTH hammer drilling system and its core ponding equipment,tools.drilling parameters and its application results.

Abstract:Rooer bits and pump suction reverse circulation teehnique are applied in completion of 2.0mand2.2m diameter bridge bored pile hole in construction of Zhuhai bridge paramerers technical requirements onoperating large diameter, mechanical equipment on off-shore platform,accidental remedying and feasibility of drillingwith bits in soft formations are discussed.

Abstract:Soldier pile wall technology has become an important mean of supporting structure in soft soil deep-foundation excavation. Combining with construction practice,design of soldier pile pattern,development of corresponging technology,and quality control are demonstrated.

Abstract:ＧＮＪ－２Ａ型泥浆净化机采用振动筛，旋流器组成三级净化集中式循环系统；正反循环泥浆净化工艺流程设计合理。该机处理泥浆量可达１０８ｍ￣３／ｈ，满足中小型工地施工时泥浆处理的需要；处理后的泥浆性能完全符合要求。

Abstract:By using of water table reduction technology at basic well points at construction site water table is reduced,specific difficult is solved in deep foundation ekcavation in coastal areas,In this article, construction and de-sign of basic well water table reduction technology are briefly introduced combining with geological properties hydrogeological conditions in coastal areas.

Abstract:Combined arched powder jetting piles,a Kind of latest,economical and effective support structure which is used in sewage disposal in construction of deep foundation pit in Shanghai,is introduced from se-lection of support project,form of support structure and result of support,etc.

Abstract:The connotation,principle,essence,characteristices,software,hardware,prupose and developing orientof comprehensive drilling technology are discussed.

Abstract:Plastic casing is used to protect borehole wall cooperating with steel casing at some shallow loose orcemented layers, that is,plastic casing,is put into use as exterior casing in upper part of hole and steel casing is still used as inner tube for isolating protection.It reduces cost,and accumulates experiences for treating comples for-matiors with plastic instead of steel.

Abstract:on the base of tests ,the influence of osmotic pressure,confined pressure and axle pressure to permeability of coal seams are discussed combining with rock mechanics,and theortical aralyses are conducted onthem,and the meaming of evaluating permeability of coal seams by using simulated test is demonstrated.

Abstract:This article intriduce a torque and revolution speed sensor which is used in drilling rig power testing,and discusses the basic principle of the basic principle of the operation, calibration,checking method and compositton of testing system etc.

Abstract:controlled explosion demolishing technology of bricks and concrete buildings is introduced by some cases,explosive parameters and safety measures are analysed and discussed.