Construction technology for grouted hollow anchor bars in undergroud powerhouse of Jinping Hydropower Station;

For construction of surge tank of Sangping hydropower station, the stepping and self-drilling hollow grout injection anchor rods are used in fractured rock at high slope and shallow landslide, resulting in good consolidation and anchorage in the surrounding rock.

The support anchorage rods all adopted 28/32 mm expanding-shell pre-stressed hollow pouring anchorage rods.

This paper expounds the geological structure in the tunnel of a certain engineering, analyzes the reasons why the self-advancing hollow grouting anchor construction is selected in the hydrous rockmass, and introduces in detail the scheme analysis, design, construction parameter, problems, and treatment measures, etc.