Device for grouting treatment of multi-layer goaf and construction method thereof

摘要: The invention discloses a device for grouting treatment of multi-layer goaf and further construction method. comprises pipe, first hole sealing device, groutingpipe head second which sequentially communicate, one or more holes communicating with the exterior are distributed in pipe head, maximum outerdiameters variable. By adopting method, can be subjected to primary forming upgoing-type sectional grouting, position accurately controlled, fixed-point is conducted, drilling project amount greatly reduced, period shortened, characteristics easy convenient operation, low cost, high economic benefits like achieved, application range wide, method basically suitable all goaf-type reinforcement projects.