Poor foundation reinforcement system and reinforcement method based on underground concealed arch structures

A poor foundation reinforcement system based on underground concealed arch structures, comprising:

• a plurality of columns of pile foundations, arranged along a bridge direction;
• wherein each two adjacent columns of pile foundations of the plurality of columns of pile foundations are provided therebetween with a plurality of arch sheets in parallel, and each of the plurality of arch sheets comprises high-pressure rotary jet piles arranged along the bridge direction;
• wherein each two adjacent arch sheets of the plurality of arch sheets are connected by a micro-bending slab disposed on the two adjacent arch sheets, the plurality of arch sheets are connected by micro-bending slabs to together form an arch ring for bearing a load on the arch ring, and a construction joint is disposed between each two adjacent micro-bending slabs of the micro-bending slabs;
• wherein the plurality of arch sheets are arranged in parallel along a transverse bridge direction, lengths of the high-pressure rotary jet piles of the plurality of arch sheets at a same position along the transverse bridge direction are the same, lengths of the high-pressure rotary jet piles of each of the plurality of arch sheets along the bridge direction are different from each other, and an arch axis of the high-pressure rotary jet piles along the bridge direction is a catenary;
• wherein the two adjacent columns of pile foundations of the plurality of columns of pile foundations and the arch ring are connected in an embedded manner, and the high-pressure rotary jet piles on both sides of the arch ring are driven into and connected rigidly to the two adjacent columns of pile foundations of the plurality of columns of pile foundations;
• wherein the micro-bending slab is a prefabricated reinforced concrete slab, and a lower part of the micro-bending slab facing toward the two adjacent arch sheets is arched;
• and
• wherein the micro-bending slab is provided with longitudinal load-bearing steel bars and stirrups.