The invention discloses a method for rapidly constructing anchor rods in a soft rock large-deformation tunnel through a
step method. The method comprises the following steps that S1, a tunnel upper step is excavated; S2, the lithological character of surrounding rock, strength, stress, the buried depth, the
layer thickness and occurrence structure characteristic information are obtained, and the tunnel large-deformation grade is judged; S3, according to the tunnel large-deformation grade, the types of the anchor rods are selected, and concrete is initially sprayed; S4, construction preparationis conducted, and setting-out is conducted at short anchor rod mounting hole sites; and S5, the short anchor rods are mounted, grouting is conducted, and after
grout reaches the strength, anchor baseplates are mounted. The construction method is suitable for a soft rock large-deformation
railway tunnel, a soft rock large-deformation highway tunnel and similar underground
engineering, according to the different construction procedures and space conditions of the
step method, the short anchor rods are constructed firstly, then the long anchor rods are constructed, it is ensured that the anchorrod supporting effect can be exerted in time, and occurring and developing of
large deformation are effectively controlled.