Aiming at the problem that the coal bodies of the two sides of the roadway were loosened and destroyed to cause the coal body to be compressed and the deformation of the roof and the two sides during the advancing process of roadway 43222 in the fourth panel area of Changping Coal Mine. Through the analysis of the grouting reinforcement mechanism of the surrounding rock of the roadway... https://allfixelectricales.shop/product-category/tub-centre-bush/