Karst grouting reinforcement water-stop constructing method

Abstract

The invention discloses a karst grouting reinforcement water-stop constructing method, which is to construct according to sizes of karst caves by adopting a principle of from big to small regarding a certain area, construct by adopting a principle of from outside to inside for the karst caves with the same size, and construct by adopting a principle of from the bottom to the top in a vertical direction. On the basis of the construction principles, the method comprises the following steps of: (1) forming grouting holes by adopting a core drill; (2) forming construction exhaust and drainage pressure relief holes; (3) inserting grouting pipes into the grouting holes, wherein the grouting pipes comprise steel pipes, grouting shock pipes and sleeve valve pipes; (4) cleaning the holes, wherein when the step (3) is completed, the grouting pipes are cleaned with clean water; (5) grouting; and (6) drawing out the grouting pipes after the grouting is completed, and blocking the grouting holes with cement mortar or concrete. By adopting the constructing method, the pertinence to karst caves is strong, the grouting quantity is small, the engineering work amount is small, the cost is low, and the effect of filling and reinforcing is good.

Description

technical field

[0001] The invention relates to a method for strengthening and stopping water by karst grouting. Background technique

[0002] At present, in covered karst areas, the existing karst grouting reinforcement technologies at home and abroad mainly use sleeve valve pipe grouting method, high-pressure rotary spraying method or riprap sand filling method. For open caves such as karst caves that have been excavated and are visible to the naked eye, riprap is used to fill them with sand or backfill them with plain concrete. For complex karst caves and karst cavities systems below the surface, the holes are arranged at equal intervals throughout the site and treated with sleeve valve pipe grouting. The grouting pressure is 0.3~3.0MPa. The grouting material is mainly cement slurry, followed by cement slurry and water. Glass combined double slurry. For some fully-filled karst caves that have been identified, single-pipe or double-pipe high-pressure rotary spraying meth...