The invention relates to a scraper, which comprises an elongated, at least tension transmitting flexible structure, which is formed of formed pieces (X), being coupled with each other one after the other in a longitudinal direction (s) and that are arranged to twist (w1) in respect with each other round an axis standing in a direction of height (h) by means of a joint arrangement (N), whereby the joint arrangement (N) comprises edge projections (N1), existing in a preceding formed piece one below the other in the direction of height (h) of the formed piece, and a cental projection (N2) existing in the following formed piece and that is to be placed between the above edge projections. A joint arrangement (N; N') is arranged to enable twisting (w2) of the successive formed pieces (X) in respect with each other round an essentially longitudinal axis (s).