A bridge is designed at K33+568 of the contract section, which crosses the xx River and runs 295 °. The design mileage starts from K33+483 to K33+653m, with a total length of 170m, 4 spans in total, and the central stake is K33+568. The bridge is a single track double width bridge. Since the bridge is located on the acceleration and deceleration lane of the service area, the left and right sides are widened by 2.5 meters, the bridge deck width is 2 × 13.5 meters, and the starting abutment is 7 meters long and 29.5 meters wide; The end abutment is 3m long and 29.5m wide. This bridge is located on a straight line. The longitudinal slopes on the bridge are - 2.366% and 2.8%, and the cross slope of the bridge deck is ± 2%. The method of setting cross slope by capping beam is adopted for adjustment. The superstructure of the main bridge adopts (4 × 6 × 40+4 × 6 × 40) m continuous T-beam, which is constructed by the method of "simple support first and then continuous", and the pier of the substructure adopts three column and pile foundation.