This paper analyzes explosive cavity pipe at present market,it′s craft size exists shortcomings aimed to features and safety targets of explosive cavity pipe,craft size of optimizing explosive cavity pipe are raised.

ABS tubes are a sort of common materials in the water system of air-conditioning Compared withgalvanized steel tubes, the economy of ABS tubes are pointed out in this paper.

It is stated by authors that the multiple drilling technology of shaped charge and normal drilling methods can be applied in practice of large diameter drilling in hard rock after analyzing the merits and defects of normal drilling methods in large diameter drilling in hard rock and discussion of the principle and influential factors of shaped charge.

In this paper the method combined with energizing blasting and hydrochloric acid well washing and its principle in elevating outflow of limestone well are discussed.

In this paper the effect method of energizing blasting is proposed to clean the ashsendimentary layers in the ash transport pipelines.

Study and application of accumulative blasting in open-pit mine;

The viewpoint that accumulative blasting is a feasible technology of improving current presplit blasting, and it can realize a meticulous excavation blasting, because the accumulative blasting is not based on experience design but fracture mechanics.