Manufacture and installation process of air duct of silicate fireproof board

1. Acceptance of board entry

After the fiber reinforced silicate board enters the field, the appearance inspection shall be carried out first. The surface shall be smooth and the phenomenon of missing edge and Angle shall not be allowed. Secondly, the fiber reinforced silicate board should have the manufacturer's certificate and test report, and the performance indicators of the board meet the requirements of design and JT6-00.

2. Air duct production

A. According to the design requirements, draw the air duct processing diagram and compile the sheet material cutting table combined with the measured data of field lost-out. The inner side length of the air duct shall be subject to the specifications. The sheet material must be rechecked before cutting, and the cut shall be carried out according to the line shape after the recheck is correct.

B. The four inner corners of the rectangular air duct are made of equilateral Angle steel as the inner Angle keel, which is fastened with hexagonal flange surface self-drilling and self-tapping screw. The Angle steel on the four sides of the flange of the air duct is welded, and the length of the inner side of the welded flange shall not be greater than the length of the inner side of the air duct when drawing the material.

Angle steel keel and air pipe flange are brushed with heat-resistant paint twice. Cut the Angle steel with a shearing machine, straighten the material and punch the hole with a bench drill. The space between the rivet hole and bolt hole of the air pipe flange shall not be greater than 150mm. The four corners of the rectangular flange are provided with bolt holes. The section steel after drilling is welded on the welding platform, and the mold is clamped tightly during welding.

C. When assembling the four sides of the air duct, the Angle steel flange at both ends of the air duct shall be used as the main support keel at the same time. According to the size of the air duct, the end face Angle steel flange and the four side Angle steel keel are made respectively, and the four corners of the Angle steel flange and the Angle steel keel are welded to form the inner dragon skeleton of the air duct.

First fix the bottom plate and Angle steel flange, and before installing the side plate, apply sealant at the seam on both sides of the bottom keel, then install the two sides of the panel and fix with the keel and flange, and then apply sealant at the seam on the outer side of the inner keel at the top of the side plate before installing the roof plate, and finally install the roof and flange and keel.

D. The side plate and flange are fixed with hexagonal flange surface self-drilling and tapping screws, and the screw spacing shall not be greater than 150mm; The edge plate and the inner Angle steel keel are fixed with hexagonal flange surface self-drilling and self-tapping screws, and the screw spacing shall not be greater than 230mm.

E. The production of air ducts should minimize the stitches. The longitudinal stitches of the plates should avoid the midline position of the long side, and the stitches of the relative plate should be staggered.

The joint section is coated with waterproof sealer, the length of both sides is clamped with 6:mm galvanized steel plate, the width of galvanized steel plate is 100mm, and the silicate plate is fixed with self-drilling and self-tapping screws, and the longitudinal spacing of screws shall not be greater than 150mm. The spliced air duct is reinforced by Angle steel internal support points, and the Angle steel spacing is 600mm in vertical and horizontal directions.

F. The production of air duct tees is divided into two forms: integral normal tees and intubated tees. The integral type is made according to the size of the three direct cutting board, the method is made with the air duct.