Rock cover-weighted consolidation grouting construction method

The invention provides a rock cover-weighted consolidation grouting construction method, and belongs to a dam foundation consolidation grouting method for hydraulic and hydroelectric engineering. When a dam foundation is excavated, a rock layer with the thickness being 5 m is reserved above the elevation of a foundation surface to be used as a rock cover weight, consolidation grouting is conducted, and the direction of grouting holes is perpendicular to the foundation surface; one-time pore-forming grouting is conducted on the rock cover weight layer, the grouting pressure is not larger than 0.5 MPa, segmented hole drilling and segmented grouting are conducted on the rock mass below the cover weight, the grouting pressure reaches 3 MPa, excavating and stripping are conducted on the rock cover weight layer after grouting ends and passes examination, shallow-layer quality inspection is then conducted on the foundation surface, and draft pipe grouting is conducted on unqualified parts. By means of the consolidat