Prefabricated concrete U-shaped side ditch and construction method

The invention discloses a prefabricated concrete U-shaped side ditch. The side ditch comprises a plurality of prefabricated U-shaped side ditch standard sections with the ends connected in sequence, and a plurality of embedded steel bars parallel to the axes of the U-shaped side ditch standard sections are arranged in the two ends of each U-shaped side ditch standard section in the circumferentialdirection of a U shape. The end parts of the embedded steel bars at the two ends of the U-shaped side ditch standard sections respectively extend out of the end parts of the corresponding U-shaped side ditch standard sections, and the outer walls of the U-shaped side ditch standard sections are provided with U-shaped convex edges or grooves arranged along the circumferential direction. The prefabricated U-shaped side ditch is formed by splicing the prefabricated standard sections, every two adjacent standard sections are in lap joint with each other through the embedded steel bars extending out of the ends and then a