The invention relates to the technical field of
tunnel construction, in particular to an advanced small
pipe grouting structure and a construction method thereof. According to an advanced small
pipe,quick closure of a primary support can be ensured, a
grout stopping wall and the primary support form an integral stress structure and are tightly attached to a tunnel face, so that the stability of the tunnel face is increased, the
safety risk of the tunnel face is greatly reduced, and soft rock tunnels and special geological tunnels excavated by blasting are facilitated; and the grouting structure is simple, the application of the
grout stopping wall basically does not occupy the
application time of the primary support, the
grout stopping wall can be applied synchronously with the primary support, the construction speed is high, rapid grouting can be realized, a great deal of time is saved and the construction progress is speeded up compared with the set of the grout stopping wall alone,and grout stopping wall can be used as a part of the primary support without dismantling after the grouting of the advanced small
pipe is finished. The advanced small pipe is factory processed, and has convenient and quick installation and grouting. The grout stopping wall is of an integral structure, has good grout stopping effect, can bear large grouting pressure, and greatly ensures the grouting effect of the advanced small pipe.