Abstract:Types, features and selection criteria of retaining walls are introduced.

Abstract:Based on field information of bored piles, an analysis is made on factors effecting filling coefficient; with a method of calculating sectional filling coefficients and drawing histogram by computer proposed.

Abstract:A brief introduction is given to the present state of underreaming technology and features ofunderreamed piles in bed rock both at home andabroad. An analysis is made on the use of MRR 1000bit with reference to field cases.

Abstract:Based on fluid mechanics, rheologic theory, method, and field data, a mathematic expressions was formed for burial depth of the underwater grouting tremie and the relationship between flow resistance of the concrete in the grouting system and theadditional concrete head are established to guide underwater grouting to be carried out by optimum grouting parameters.

Abstract:Bored piles braced together by anchorsto constuct the retaining wall is one of the main methods applied in deep foundation pit retaining supportfor high-rise buildings. The design method of anchor-braced bored piles is described with reference to thedeep fondation pit retaining support for Yantai Longjing Building.

Abstract:From the view point of corrosion mechanisms, the present state of corrosion protection techniques are described with proposals on the development trend put forward.

Abstract:airl ideal technical parameters are obtained based on analysis of pulse electro-plating theory andstudy on effects of the technical parameters on hardness and abrasiveness of Ni coating, creating a base for manufacture of diamond products with pulse electro-plated Ni matrix.

Abstract:DL-93 sealing agent is a greyish white fabric powder which is formulated with limestone powder as the major material. Lab appraisal and field application has proved that it provides high acid dissolution, efficient sealing and easy handling band it can be removed by acidation, hence reduce damage to reserves.

Abstract:Properties, test and study methodology of the compound colloidal drilling fluid, as well as effects of the foaming agent and colloidal fluid on foaming and foam stabilization are described. Productionand uses of it are also introduced.

Abstract:Design features, structural parameters and uses of HBT-50 concrete pump are introduced.