What is the pressure injection method and the drug pack method in the consolidation method?

The pressure injection method is to measure the liquid passing through the two sets of pumps and send it to the mixer. The mixed material is continuously injected through the pipeline under pressure to a certain depth of the rock foundation. After the prescribed injection volume is completed, it is closed. The method of sealing the plug to allow the grouting material to complete the process of infiltration, reaction, re-permeation and diffusion until complete consolidation within a predetermined foundation area.

The bag-type consolidation method is to pack two-component liquids in plastic bags of different sizes, and then pack the two packages in a long cylindrical bag. In general, the drug pack is made from a plastic film of 0.05 to 0.07 mm. The typical drug package has an outer diameter of about 43 mm and a length of about 30 cm. The inner layer of the package is an isocyanate, the outer layer is a polyether polyol having a molecular weight of 400 to 2000, 10% to 20% of a plasticizer, 0.3% to 5.0% of water, and an appropriate catalyst. When the underground working area requires reinforcement of the rock formation, a suitable location can be selected. Vertically to the rock wall, a hole with an aperture of 5 cm is drilled, and the interval between the hole and the hole can be generally 2 meters. According to the coal seam or rock wall stratification, crushing cracks and development conditions, put 1 to 2 cartridges in each hole, use an electric drill with a connection sleeve of about 200 mm long to drive the hardwood square bolts with sharpened heads , prick the packet and stir for 20 to 30 seconds. Then seal the hole with a cork, allow the slurry to react, foam and anchor the hardwood rod, and allow the slurry to penetrate to the broken rock wall under the foaming pressure. In the crack, consolidation is completed.

The above is a detailed introduction of the working principle of the injection method and the drug pack method. It is not clear to quickly collect it!