METHOD OF MANUFACTURING A TUBE FOR MICROTONALING Russian patent published in 2018 - IPC F16L9/12 B29C53/74 

FIELD: instrument making.

SUBSTANCE: invention relates to the production of fiberglass pipes for microtunneling by continuous winding. Quartz sand is loaded into a storage bin with a pneumatic conveying system. Pre-accelerated resin and the catalyst are piped through a pipe to a plant for the manufacture of fiberglass pipes in pneumatic mixers where they are mixed. Resulting binder composition is fed through the dosing tray to the surface of the strip to form a composite. Strip is a cylindrical surface formed by means of an endless steel strip with a width of 30 to 60 mm wound on the joint frame at the junction. As a result of mixing the resin and the catalyst, an exothermic chemical polymerization reaction takes place. For the formation of the first liner layer of the tube, simultaneously with the binder, a glass fiber cloth of "C" type and a chopped glass-roving are fed to the surface of the strip. Axial displacement of its surface occurs over the width of the tape for the complete rotation of the strip. Number of layers of the formed composite in the liner layer of the pipe corresponds to the ratio of the width of the feed zone to the width of the strip. Polymerization of these layers occurs simultaneously. When forming the structural layer simultaneously with the supply of the binder, quartz sand, chopped roving and winding roving are fed to the surface of the liner layer. Uniform impregnation of all components with a binder and removal of air from the formed composite is ensured by maintaining a constant tension of the winding threads and the work of the roll shafts on the surface of the pipe body being formed. Formed mother pipe moves along with the surface of the strip in the axial direction. To form an outer protective layer, a fiberglass of type "C" or type "E" impregnated with a structural resin is fed onto the formed structural layer. After leaving the strip, matching site for joint are cut and fiddled the pipe.

EFFECT: in the method for manufacturing the pipe, the resin with the accelerator is loaded into the mixing tanks, in which uniform mixing and thermostating is ensured.

1 cl