An example of the application of deep-hole springing blasting technology in pillar-stoping at Wu Daoling molybdenum mine is introduced in this paper,which choose the reasonable method of blasting parameter,adopt the accurate blasting network and strict safety management,in order to advance the safety and efficiency in the pinnar-stoping.

In view of Wulihe Stadium in Shenyang city its structure and around environment,especially it is the most largest of national buildings to be demolished so far,so millisecond in-site collapse blasting is adopted,and technology design consists of blasting pretreatment,blasting network choice and blasting safety test.

The restriction conditions for a kind of milli se cond blasting net are discussed, and the net consists of (m+1) kinds of millisec ond detonators.

The restriction conditions of parallel-series connection millisecond blasting net for single hole blasting of once each time point are discussed.

The demolition plan,the blasting parameters of the main explosive hole and pre-splitting hole,blasting network,blasting equipment and a series of safeguarding measures are detailed.

The blasting scheme,blasting parametes,hole assignment,blasting network,and blasting safety are introduced in demolishing a brick-concrete structure building.

By way of increasing the initiating network s reliability,the blasting network was adopted.

In this paper,on the basis of analyzing the exact explosion experiment of detonators in a series circuit,simplified exact explosion condition has been advanced,the check formula about exact explosion of detonators in series-in-parallel has been built,and computer method of optimum design to firing circuits have been given.

In this paper, on the basis of analyzing the exact explosion experiment of detonators in a series circuit, a simplified exact explosion condition has been put forward,the check formula on exact explosion of detonators in series-in parallel has been built, and a computer method of optimum design for firing circuit has been given.

According to the requirement for reliability of electric detonator and blasting circuit which the worker inspects on the spot,the low-power-consuming SCM MSP430F133 produced by American TI Company is adopted to design a pattern of intelligent blasting circuit inspecting instrument,which is as small as a mobile phone.

Because of its credibility,safety,briefness,thrift,and easy operation,the circular ignition of blasting circuit of NONEL tube detonators is designed.

A blasting circuit with non-electric bidirectional multi-loop grid is adopted to once-through blast 15 thousand cartridges and 686 kg blasting powder, a 3×10~4 m~2 workshop is successfully demolished with being fully disjointed, small vibration and a muckpile of 1～3 m.

The detonating network has many forms and its design shall conform the requirements of practical use and economy ,taking into consideration the objective of project and the conventions of construction.