Laogou Canal Bridge is located G244 National Road K2+498 in Baoji City, Shaanxi Province. It is a straight bridge, and it’s superstructure is prestressed concrete hollow slab with a span of 13 m and width of 12 m. And the bridge deck is paved with 9 cm asphalt concrete, ATR-1 type waterproof layer and 10 cm C40 concrete. Rigid anti-collision railings are provided on both sides of the bridge. At both ends of the bridge, a grade flat approach slab with a length of 5 meters is provided. This bridge is a semi-integral bridge, the end girders on the abutment are rigidly connected to the main girders, and the lower part of the abutment is connected to the superstructure through bearings, thus eliminating the expansion joints and deck expansion devices at the abutment, avoiding the maintenance and repair of the deck expansion devices, and improving the usability and durability of the bridge. At the same time, because the main girders are connected to the abutments through bearings, neither bending moment nor shear force is transferred, which makes the additional forces on the bridge caused by temperature changes, concrete shrinkage creep and settlement differences of piers and abutments smaller compared to the overall bridge. Drainage pipes are installed in the lower part of the end girders to facilitate drainage, and foam filler is installed between the end girders and the wingwalls to accommodate the deformation of the main girders and prevent water from eroding the main girders.
The Laogou Canal Bridge was constructed by Baoji Highway Administration and designed by Xi'an Highway Research Institute. The School of Civil Engineering of Fuzhou University is responsible for the horizontal scientific research project with the bridge as the background, and has guided the design of the bridge and carried out research on the bridge structure. The bridge was completed and opened to traffic in June 2020.
(a) Side view of the bridge
(b) Pavement