A viaduct structure, consisting of
- steel bridge columns (1),
- steel plate girders (2),
- a bridge deck bottom steel plate (3),
- bridge deck side steel plates (4) and
- cement-gravel concrete (5), wherein the steel bridge columns (1), the steel plate girders (2), the bridge deck bottom steel plate (3) and the bridge deck side steel plates (4) are made of steel, the steel bridge columns (1) are lower portions of a viaduct, the steel bridge columns (1) support the steel plate girders and a bridge deck, the steel plate girders (2) are welded to upper portions of the steel bridge columns (1), a plurality of steel bridge columns (1) can be welded to a lower portion of one long steel plate girder (2), the steel plate girders (2) are long, the steel plate girders (2) have a length the same as that of the viaduct, the steel plate girders (2) support the bridge deck above, upper portions of the steel plate girders (2) are welded to the bridge deck bottom steel plate (3), two steel plate girders (2) are located on a left side and a right side of the viaduct, the two steel plate girders (2) are welded at bottoms of a left side and a right side of the bridge deck bottom steel plate (3) respectively, a width of the bridge deck bottom steel plate (3) is that of the bridge deck, a length of the bridge deck bottom steel plate (3) is that of the viaduct, the bridge deck bottom steel plate (3) is sealed under the bridge deck, and can prevent cement slurry from flowing down when the cement-gravel concrete (5) above the bridge deck bottom steel plate (3) is poured, the bridge deck bottom steel plate (3) is welded to the steel plate girders (2) and the steel bridge columns (1), to form a ceiling type steel architecture that is firm and can bear the pressure from the bridge deck and numerous vehicles above, the bridge deck side steel plates (4) are welded to upper portions of two sides of the bridge deck bottom steel plate (3), the bridge deck side steel plates (4) have a length the same as that of the viaduct, a groove-like structure is formed by the bridge deck side steel plates (4) on a left side and a right side and the bridge deck bottom steel plate (3), the cement-gravel concrete (5) is arranged in the groove-like structure above the bridge deck bottom steel plate (3), the bridge deck side steel plates (4) can prevent cement slurry from flowing out when the cement-gravel concrete (5) is poured, and the cement-gravel concrete (5), the bridge deck side steel plates (4) and the bridge deck bottom steel plate (3) are coagulated together and bonded firmly;
- wherein the steel bridge columns (1), the steel plate girders (2), the bridge deck bottom steel plate (3) and the bridge deck side steel plates (4) are of hollow bore structures.