A processing method for large-diameter buried FRP sand-filled pipe

Abstract

The invention discloses a processing method for a large-caliber buried glass reinforced plastic sand inclusion pipe, and belongs to the technical field of composite pipes. The processing method includes the steps that modified steel fibers, modified carbon fibers and modified glass fibers are woven into a fiber mat, the fiber mat is subjected to plastic soaking treatment, and a fiber mat layer A is obtained; modified glass fibers and modified carbon fibers are woven into a fiber mat, the fiber mat is subjected to plastic soaking treatment, and a fiber mat layer B is obtained; then the fiber mat layer A is processed into a lining layer on a sand inclusion pipe mold, and the fiber mat layer B is processed into an inner protection layer on the lining layer; quartz sand, chopped glass fibers, magnesium borate whiskers and unsaturated polyester resin are mixed into sand strips, the sand strips are processed into a sand inclusion layer on the inner protection layer, then the fiber mat layer B is processed into an outer protection layer on the sand inclusion layer, then unsaturated polyester resin, and chopped glass fibers and magnesium borate whiskers are mixed on the outer protection layer to be processed into an outer surface layer till the designed wall thickness is completed; finally, finishing, demolding, cleaning and testing are carried out after solidifying, and the finished product can be obtained.

Description

technical field [0001] The invention belongs to the technical field of composite pipes and relates to the manufacture of FRP sand-filled pipes, in particular to a processing method for large-diameter buried FRP sand-filled pipes Background technique [0002] At present, the large-diameter drainage and sewage pipes used in China basically use traditional concrete pipes and glass fiber reinforced plastic sand pipes. The traditional concrete pipes cannot be quickly constructed because they need to be used as concrete bottom plates and have a rather long maintenance period when the pipes are drained. Concrete pipes are heavy, which seriously increases the difficulty of construction. Considering the above shortcomings, most of the urban road reconstruction designs use light-weight, high-strength FRP sand-filled pipes that do not require foundations. [0003] FRP sand-filled pipe is a new type of FRP composite pipe made of unsaturated polyester resin as a matrix material, glass f...

AI Technical Summary

Problems solved by technology

But there are still some deficiencies, such as the wear resistance of the inner lining is slightly poor, the inner lining has been washed by a large amount of water for a long time, the pipe wall has obvious delamination, fiber tensile damage, shedding, fracture and other phenomena have brought great safety hazards. Hidden dangers, and the cost is relatively high, and it is not environmentally friendly