Views: 0 Author: Site Editor Publish Time: 2021-07-14 Origin: Site
1) Firstly, the mold surface of Shandong glass fiber winding sand pipe was coated with release agent (or coated with transparent cellophane);
2) After fully drying, the magnesium oxychloride cement added with initiator (or curing agent), accelerator and other additives is evenly brushed on the molding surface of the mold;
3) Then the cut glass cloth is laid on the sand pipe of Shandong fiberglass winding;
4) Then apply magnesium oxychloride cement on the paved glass cloth, and pay attention to remove bubbles.
5) After applying magnesium oxychloride cement slurry, the cut glass cloth is laid;
6) Repeat the above operation until the design and specification thickness of Shandong glass fiber winding sand pipe is reached.
1) Shandong glass fiber winding sand pipe duct is reinforced. When the side length of rectangular air duct is more than 900mm and the length of pipe section is greater than 1250mm, it should be reinforced. The reinforcement should be made of bulk material (fiber reinforced rubber) and the reinforcing plate should be set at the maximum stress to improve the section modulus, so as to improve the overall strength of the pipe. The reinforcement of Shandong glass fiber winding sand pipe can also be strengthened by using metal parts or other corrosion-resistant materials with anti-corrosion treatment after the air pipe is made. The reinforcement shall be integrated with Shandong glass fiber winding sand clamp pipe channel, and the cracks shall be sealed with the same cementitious material as the pipe body.
2) The thickness of the slurry on the surface of the Shandong glass fiber winding sand pipe channel is suitable for flattening the glass fiber mesh fabric (visible fabric). Dense pores and slurry leakage are not allowed on the surface of pipe wall to avoid stress concentration when it is subjected to bending tensile stress (positive wind pressure) and bending pressure stress (negative wind pressure).
3) There should be transition half arc at the corner of pipe body and flange of Shandong glass fiber winding sand pipe. The radius of transition half arc should be 0.8-1.2 times of wall thickness, so as to improve the bearing capacity of cantilever flange and avoid stress concentration. Fiberglass mesh at duct flange is required to extend to duct body.
4) If the length and width of glass fiber mesh are not enough, the lap method must be adopted to improve the transverse bearing capacity of the lap, so as to effectively overcome the radial tensile stress, bending joint stress and bending shear stress. The lap length of glass fiber cloth at the joint is generally 50-100mm; And the joints of each layer of fiberglass cloth shall be at a certain distance from the joints of adjacent layers. The distance between the longitudinal and transverse joints between adjacent layers shall be greater than 300mm, and the distance between the joints of the same layer shall not be less than 500mm.
5) When the round air duct is pasted, the glass cloth can be cut into cloth belt along the direction of 45 degree radial direction; When paste the conical products, the cloth can be cut according to the sector.