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井筒工作面预注浆一般需在井底浇筑混凝土止水垫,若含水层上部覆有一定厚度的隔水岩层时,亦可以利用该段岩帽、埋设孔口管代替混凝土垫,其技术经济效益更高。而当注浆工作面以下有隔水性能较好的岩层,或经上次注浆改造已具有隔水性的原含水岩层,其厚度和强度足以封水和抗压时,亦可作岩帽,埋设孔口管作承压止浆垫。淮北童亭副井在井深355.5～394米和411～441.4米两井段作工作面预注浆时,就是利用岩帽作止浆垫,取得良好的效果。
Pre-grouting of wellbore face usually requires placing concrete sealing pad at the bottom of the well. If the upper aquifer is covered with a certain thickness of aqueduct, the rock cap can also be used to replace the concrete pad by laying the orifice pipe. More effective. When the grouting below the face with good performance of the rock or rock grouting by the last grouting has modified the original water-bearing rock formation, its thickness and strength sufficient to seal and compressive, but also for rock caps, Buried orifice tube for pressure pad. Tong Ting auxiliary wells in Huaibei wells 355.5 ~ 394 m and 411 ~ 441.4 m two wells for pre-grouting work surface, is the use of rock caps for the pad, and achieved good results.