Bag grouting type foundation pit supporting structure

The invention relates to a bag grouting type foundation pit supporting structure, and belongs to the field of building engineering construction. The bag grouting type foundation pit supporting structure comprises a supporting steel pipe, a grouting channel is formed in the supporting steel pipe, a filling bag is arranged at the end part of the supporting steel pipe, a grouting pipe communicating with the grouting channel is arranged at the end part of the supporting steel pipe, the end, away from the grouting channel, of the grouting pipe is connected with the filling bag, and a protection piece used for protecting the filling bag and the grouting pipe is further arranged at the end of the supporting steel pipe. According to the through the bag grouting type foundation pit supporting structure, the arrangement of the filling bag, cement paste is injected into the filling bag along the grouting channel, the filling bag is pressed to expand, surrounding soil is compacted in the expansion process, finally, the f