The invention relates to an advanced grouting method of a small
pipe roofing, comprising the following steps of: slope protection
processing; inserting a double guide
pipe; closing the working surface of a side slope; grouting to
adit section through the double guide
pipe; preserving core soil for driving by a short
step method; mounting an arch part bracket, mounting a
single row pipe roofing pipe on the arch part bracket,
welding and hanging a
metal mesh on the arch part bracket and mesh-spurting concrete so as to form an arch part support; grouting to a driving section through the
single row pipe roofing pipe; continuing to excavate a lower step, mounting bracket legs of the arch part bracket and mesh-spurting the concrete so as to form a wall part support; and adopting the concrete to carry out permanent masonry for the excavated laneway, adopting the method to continue digging at the front and masonry at the back until the
engineering of the driving section is completed. The method carries out advanced grouting through the small guide pipe and increases the adhesion of a loose layer; an outer support formed by a
metal mesh-spurting concrete and the pipe roofing ensures the stability and the safety of the excavated laneway before the permanent support is carried out; the cost of the
engineering is low; the construction speed is fast; the safe effect is good; and the construction quality can be ensured.