System and method for on-site mixed loading of emulsion explosives in tunnel blasting peripheral holes

Abstract

The invention discloses a system for on-site mixed loading of emulsion explosives in tunnel blasting peripheral holes. The system comprises an emulsion matrix storage tank, an emulsion matrix conveying pipe, a sensitizing agent storage tank, a sensitizing agent conveying pipe, a mixed loading emulsion explosive pumping system, an explosive conveying pipe, a rapid curing foam material storage tank, a buffering foam material conveying pipe and a mixing generator. The invention discloses a method for filling mixed emulsion explosives into tunnel blasting peripheral holes. The method comprises the following steps: (1) respectively adding an emulsion matrix, a sensitizer and a foam buffer material; (2) conveying the emulsion matrix and the sensitizer to a mixed emulsion explosive pumping system; (3) pumping the emulsion matrix and the sensitizer into a mixing generator, and fully mixing to generate an emulsion explosive; meanwhile, the foam buffer material is conveyed into a mixing generator; and (IV) directly and simultaneously injecting the emulsion explosive and the foam buffer material into the blast hole. According to the invention, obstacles are cleared away for the application of an on-site emulsion explosive mixed loading technology in tunnel blasting.

Description

technical field [0001] The invention relates to the technical field of engineering blasting for tunnel construction, in particular to a system and method for on-site mixing of emulsion explosives in tunnel blasting peripheral holes. Background technique [0002] In tunnel blasting, the existing on-site mixed emulsion explosive charging technology can quickly fill undercut holes, caving holes, floor holes, etc., which greatly improves the charging efficiency compared with manual charging of finished explosives. On-site mixed emulsion explosive technology has the requirements of safety, efficiency, economy and environmental protection, and has been widely used in open-pit mines. With the maturity of this technology, it has been gradually applied in blasting and excavation of traffic tunnels, especially in operating conditions. In projects with harsh and high construction efficiency requirements, the need for this technology is more urgent. However, for tunnel blasting, smooth...

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Problems solved by technology

[0003] To ensure the effect of smooth blasting, it is necessary to adopt the structure of non-coupling charges in the peripheral holes, and the characteristic of mixed emulsion explosives is coupled charges, so it is difficult to achieve the effect of smooth blasting in the peripheral holes

This technology cannot meet the technical requirements of charge in peripheral holes, and cannot achieve the purpose of good smooth blasting. Some solutions proposed cannot solve this problem well. Only the conventional way of filling finished explosives in rolls at intervals can be used, which affects Charge efficiency, so the advantages of on-site mixed emulsion explosive technology cannot be fully reflected

[0004] At present, there is a way to adjust the output of explosives by controlling the pull-out speed of the charge tube, so as to realize that the charge is not coupled in the hole. This method requires very precise control of the tube pull-out speed and spraying speed, and the current technology is still difficult to perfect. If it is achieved, there will often be cases of multiple charges or broken charges, the blasting effect is not ideal, and there may even be blast rejections, which will affect the promotion of on-site mixed emulsion explosive technology, so this method is still in the exploratory stage

Another method is to install a PVC pipe in the hole first, then fill the hole with a mixed emulsion explosive, and make the explosive and the hole wall have a certain interval through the PVC pipe, so as to achieve the purpose of not coupling the charge, but the method The main disadvantages of this method are as follows: one is that an extra PVC pipe needs to be added in each hole, which greatly increases the construction cost; the other is that the PVC material will generate a large amount of toxic and harmful gases under the action of the high temperature and high pressure gas of the explosive explosion, which seriously affects the health of construction workers. healthy

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