Abstract: A method for adjusting the tolerances, regarding shape and dimensions, of an elongated vibrated concrete article made in a mould after removing the article from the mould. The invention makes it possible to achieve close tolerances inspite of using a rather wet concrete composition, which is optimized as regards strength but which causes adhering and suction in the mould and alteration of the articles shape before hardening. According to the invention, the method is characterized in that the article, before hardening, is brought into engagement with one long side a straight-edge rule for being shaped thereby, in that the article on the end surfaces is pressed to a predetermined length, and in that the cross sectional shape of the article is adjusted into agreement with the desired shape while keeping the article in engagement with the rule and pressing it on the end surfaces.

Abstract: An apparatus for adjusting the tolerances regarding the shape and dimensions of an elongated vibrated concrete article made in a mold after removing the article from the mold, making it possible to achieve close tolerances even when using a rather wet concrete composition optimized as regards strength. According to the invention, the article, before hardening, is brought into engagement with one long side of a straight-edge rule for being shaped thereby, the article is pressed on its end surfaces to a predetermined length, and the cross-sectional shape of the article is adjusted to agree with the intended cross-sectional shape while keeping the article in engagement with the rule and pressing it on the end surfaces.

Abstract: A moulding tool for making curb stones from vibrated concrete having a rather high water content, the moulding tool being designed to offer good vibration properties and safe and simple removal of the curb stone from the moulding tool despite the fact that the concrete has a troublesome tendency of adhering to the moulding tool. According to the invention such a moulding tool is characterized in that the mould cavity is defined mainly by a main member of the moulding tool, said main member being a substantially rigid unit, and by two displacable end members, and that the moulded curb stone is removable from the main member in a direction parallel to the direction of displacement of the end members, the end members having means for exerting force on the curb stone when being displaced from the moulding position.

Abstract: Moulding tool for making an article from vibrated concrete optimized as regards strength, the article having embedded therein a tubular sleeve located by a pin during the moulding process. The moulding tool is designed to keep the interior of the sleeve free from concrete and to decrease wear and mechanical stress exerted on the pin during the moulding process. Such a moulding tool is characterized in that, during the moulding process, the pin extends through a sealing and dampening body made from an elastic or semi-hard material, the sealing and dampening body having sealing engagement with the pin. The sealing and dampening body is compressed by the sleeve so that a sealing engagement is achieved between one end of the sleeve and the sealing and dampening body and between the other end of the sleeve and a surface of the moulding tool.