The invention relates to a flexible base layer
asphalt pavement splicing and widening construction method. The construction method is characterized in that old road pavement structure
layers are milled and planed, and then connecting steps are arranged at the interfaces of the old road structure
layers; then an old road splicing widening connecting joint and the road
bed outer edge of a widening pavement are each provided with a road
bed solidifying beam, and a
steel bar mesh grid is laid on the top surface of each road
bed solidifying beam; materials generated after the upper face layer of an old pavement structure and the other structure
layers of the old pavement structure are milled are used for new road base layers; in construction, a
glass fiber geogrid is laid on the top surface of a two-ash gravel recycling layer, a connecting grid and joint filling
slurry are arranged at the connecting joint of a new pavement and an old pavement, and a crack partition plate is laid at a pavement splicing widening connecting joint on the top surface of a
lower face layer; and finally, paving construction of pavement upper face layers of the new pavement and the old pavement are conducted simultaneously. The old road building materials can be recycled, the integrality of an
asphalt pavement splicing widening structure can be improved, and the solidifying cost of the pavements in the later period can further be reduced.