Its a waste box which works to collect waste coming from different sides of a sanitary sewer system
Drawing labels, details, and other text information extracted from the CAD file (Translated from Spanish):
Upper slab, concrete, bed, both senses, central, both senses, Perimeter protection, Protection slab, both senses, Concrete f’c, concrete, Template, Partition wall, Cm. Esp., reinforcing steel, Prop., Flattened with mortar, with, Street level, Concrete dala, Block wall, Valve operating box, Registration section, Esc., Foundation slab, Top cover, Of fo Fo., Concrete dala, Block wall, with, Deck slab, Operating box, Upper slab, Of valves, Pend., ground, natural
