FRP(fiberglass reinforced plastic) anchor rod capable of bearing high pretightening force and manufacture method thereof

Abstract

The invention relates to an FRP(fiberglass reinforced plastic) anchor rod capable of bearing a high pretightening force and a manufacture method thereof. The anchor rod comprises a glass fiber yarn bundle rope-shaped rod body, bulk glass fiber yarns are twisted in a grouped manner to form glass fiber yarn bundles, and then are twisted in a sinistral manner to form the glass fiber yarn bundle rope-shaped rod body, thread grooves in the surface of the glass fiber yarn bundle rope-shaped rod body are wound by bulk glass fiber yarns which fill and level up the thread grooves, and after being bonded by a resin, the bulk glass fiber yarns are molded and cured. The bulk glass fiber yarns are twisted in the grouped manner to form several glass fiber yarn bundles, and then the glass fiber yarn bundle rope-shaped rod body is formed, the thread grooves in the surface of the glass fiber yarn bundle rope-shaped rod body are wound by the bulk glass fiber yarns which fill and level up the thread grooves, and then are impregnated with the resin, after the bulk glass fiber yarns are bonded by the resin, the rod body of the uncured anchor rod which is bonded with the glass fiber yarns is made to traverse a guide hole of a forming die head, and the uncured anchor rod is shaped into a dextral FRP anchor rod by means of an internal screw thread. By means of the sinistral winding manner of the glass fiber yarns, the tensile strength of the glass fiber yarns can be fully utilized, the torsional strength of the rod body is improved, the high pretightening force of the FRP anchor rod can be guaranteed, the problem that a relatively-large pretightening force cannot be applied to the FRP anchor rod can be well solved, and the usage effect of the FRP anchor rod is excellent.

Description

technical field [0001] The invention relates to a method for manufacturing a glass fiber reinforced plastic bolt, and is especially suitable for a glass fiber reinforced plastic bolt capable of withstanding high pre-tightening force in underground coal mines and a manufacturing method thereof. Background technique [0002] With the development of mine bolt support technology, the amount of bolt used in the underground is gradually increasing. In order to improve work efficiency, in the two lanes of the working face near the side of the mining face and the coal side of the working face, the rod body of the anchor rod is required to be cuttable. Among the cuttable anchor rods, there are wooden anchor rods, Bamboo anchors and fiberglass anchors. [0003] In recent years, FRP bolts have been popularized in coal mine support at home and abroad, but the existing FRP bolts are produced by ordinary pultrusion technology. Although the tensile strength of the rod is relatively high, ...

AI Technical Summary

Problems solved by technology

Insufficient torsional strength of FRP bolts in actual production is also a major obstacle restricting the use of FRP bolts

Images