Patent ID: 7763201
Filing Date: 2010-07-27
Classification: B28B

Abstract:
1. A method for the production of a multi-layer concrete pipe, comprising the following steps: producing an outer layer by filling a mold mantle which stands essentially vertically, with a first concrete mixture by means of a first charging system and compacting said first concrete mixture in the mold mantle; producing at least one inner layer by filling said outer layer within said mold mantle, which stands essentially vertically, with a second concrete mixture, which is an acid-resistant concrete mixture different from said first concrete mixture, by means of a second charging system; compacting the inner concrete layer with compacting rollers that act essentially radially and with a smoothing tool; and removing the concrete pipe formed from the first and second concrete mixtures from the mold; wherein said at least one inner layer is applied directly to said outer layer before said outer layer is cured.