The invention discloses a construction structure and a construction method for modifying and upgrading a road into a
sponge city. The invention comprises a tree
pool, a sidewalk, a non-
motorized vehicle lane, a concave greenbelt, open kerbs,
porous fiber cotton modules, seepage wells, grass planting ditches and rainwater gardens. The
porous fiber cotton modules are arranged between the tree poolson the two sides of the sidewalk and the non-
motorized vehicle lane; the seepage wells comprises rainwater wells, and
rammed earth layers, gravel water purification
layers and coarse sand
layers which are sequentially arranged around the rainwater wells from bottom to top; an overflow
pipe communicating with a catch basin is arranged in the middle of the catch basin; one end, not communicatingwith the catch basin, of the overflow
pipe is connected with a municipal rainwater
pipe network; a water guide pipe is arranged in a
rammed earth layer, one end of the water guide pipe communicates with the porous cellucotton module, the other end of the water guide pipe communicates with the rainwater wells and provided with a stainless steel
sewage intercepting cover, a rainwater garden is arranged on the sunken greenbelt, a blind pipe and an overflow well are arranged in the rainwater garden, the blind pipe communicates with the overflow well, and the overflow well is connected to a nearbymunicipal rainwater pipe network. According to the invention, the functions of unified storage, purification and
discharge are realized.