Device for protecting screens in boilers, and in particular for garbage incinerators, and procedure for manufacture of this device

Manufacturing process for production of the boiler screen protective device wherein tubes (1, 14) are arranged parallel to each other in one plane;

• next, they are gathered together using joining ribs (17) welded between the adjacent tubes;
• then, parts of the auxiliary fastening ribs (2, 11;
• 3, 13) are welded onto the tubes, thus forming an angle of between 30.degree. and 60.degree. with the general plane of the axes of the tubes, at a height corresponding to a fraction of the height of a first series of fireproof bricks (4, 5) having vertical grooves matching up with the auxiliary ribs and having inner recesses (7, 8) which enlarge as they extend toward the furnace body and at intervals corresponding to at least the height of the bricks (6, 10) composing a second series, these latter not having vertical grooves but containing recesses (9, 10) which fit together with the recesses of the bricks in the first series;
• the process is also characterized by the fact that the surfaces of the tubes, of the joining ribs, and of the auxiliary ribs, on top of a first lower row of bricks making up the first series, are covered with a coating of fireproof cement;
• that a horizontal row of bricks composing the first series (4) is fastened onto the auxiliary ribs of this first row;
• that the surfaces of the tubes, of the joining ribs, and of the upper recesses (8) of the bricks of the first series thus laid down are covered with a coating of fireproof cement;
• that a horizontal row of bricks of the second series (6, 18) is placed above the bricks in this first row;
• that the surfaces of the tubes, of the joining ribs, of the auxiliary ribs of the upper horizontal row, and of the recesses of the bricks making up the second series thus laid down are covered with a coating of fireproof cement;
• that another horizontal row (5) of bricks composing the first series is fastened onto the auxiliary ribs of this upper horizontal row, and so on, until the top of the protective screen is reached.