1, small bridges and culverts (including overflow bridges, water pavements, inverted siphons and aqueducts) shall be surveyed, and data shall be collected in accordance with regulations, and the drainage system, farmland irrigation and drainage system, topography, geology, hydrology and subgrade comprehensive drainage system in this area shall be investigated on the spot, and the location of small bridges and culverts shall be reasonably determined.
2. Elevation and section measurement of small bridges, flood control bridges, complex culverts, ditch modification projects, artificial irrigation and drainage channels, etc. Should comply with the relevant provisions of the specification.
3. Use paper to locate and determine the line position, and draw the intersection angle of the small bridge and culvert, as well as the structural type, aperture, culvert length and import and export form. , should be on-site inspection.
4. When rebuilding small highway bridges and culverts, we should find out the location, structural form, load standard, span, height, length, foundation form, buried depth, construction year, damage and repair of the original bridges and culverts, and conduct on-site appraisal to determine their utilization.
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