2. Design load: urban class A, crowd load 3.5kN/m 7. The upper part of this bridge is 27.6m prestressed or reinforced concrete hollow slab, the bridge deck is continuous, the lower pier is column pier, and the bored pile foundation is used; The abutment adopts gravity L-abutment expansion foundation. 8. The structural layer between the new bridge and the old bridge is disconnected, and a 2cm wide longitudinal joint is reserved, and the bridge deck is continuous. 9. One SSFB-D80 expansion joint is set at 0 # abutment, 3 # pier and 6 # abutment respectively. 10. Design flood frequency: 1/100. 11. Geological conditions: the riverbed section is covered with 1.5-4.2m thick pebble layer, 8-11.3 thick strongly weathered granite layer, and the following is slightly weathered granite layer; The allowable bearing capacity of the foundation is 400kpa.
