The present invention relates to a bottom seal for engineer structures, comprising a trough which is introduced in a constructional component and a lining applied to the trough of steel sheet, which has a contour corresponding to the contour of the trough and a plurality of passage openings, in the region of each passage opening of a fastening means in the trough is introduced and with the surrounding the through opening region of the lining is welded, wherein the attachment means of a rod-like, in the trough, as well as an anchoring part is introduced at the end of the anchoring part designed and transversely with respect to a longitudinal axis of the anchoring member extending plate-like fastening plate, which comprises as a support between the tub and the surrounding the through opening region of the lining is arranged and the passage opening is covered and, along the edge region of the through opening with the surrounding region of the lining is sealingly welded.
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