Anchor rod construction process for sandy gravel stratum under water level of foundation pit engineering

The invention provides an anchor rod construction process for a sandy gravel stratum under the water level of a foundation pit project. The anchor rod construction process comprises the steps that S10, a plugging device is installed at a hole opening; s20, drilling the casing pipe in advance; s30, cement paste is injected through a drill rod until the cement paste flows out of a hole opening; s40, the drill rod is pulled out section by section; step S50, assembling a steel strand assembly; step S60, inserting a steel strand assembly into the sleeve; s70, the casing pipe is pulled out section by section, and plugging and grouting are conducted; s80, the hole opening is blocked through cement gum; s90, after the cement paste is finally set, pressure grouting is conducted through a pressure grouting pipe; s100, after a preset number of days, the steel strand assembly is tensioned; and S110, filling and grouting are conducted through the filling and grouting pipe. By the adoption of the technical scheme, the prob