High-strength, constant-resistance extender for anchorage cables and usage thereof

Abstract

The invention discloses a high-strength, constant-resistance extender for anchorage cables and usage thereof. The extender comprises a cylindrical sleeve, a wire-drawing die and a cold-drawn rod; the wire-drawing die is a taper die, and is connected with the sleeve through screw threads or high-strength bolts; the cold-drawn rod is a section of reducing metal rod, one end of the cold-drawn rod is a thick section, the other end of the cold-drawn rod is a thin section, a taper section is between the thick section and the thin section, the taper of the taper section is matched with the taper of the wire-drawing die, the thick end of the cold-drawn rod is inserted in the sleeve, and the end of the thin section of the cold-drawn rod passes through the hole of the wire-drawing die; the tail of the sleeve is provided with an external thread which is used for mounting a tray and a locknut, and the end of the thin section of the cold-drawn rod is provided with an external thread which is used for connecting an anchorage cable, or is provided with an external thread which is used for connecting an anchorage cable body; and the tail of the sleeve is provided with an end plug which is used for connecting another anchorage cable body. Besides constant-resistance deformation, the other advantage of drawing is that after the rod passes through the die hole, the strength is greatly increased.

Description

technical field [0001] The invention relates to an anchor cable used for support in engineering fields such as mines, tunnels, water conservancy and hydropower, and more particularly relates to an extension device for the anchor cable. Background technique [0002] When supporting in engineering fields such as mines, tunnels, water conservancy and hydropower, anchor cables are widely used supporting equipment. With the continuous increase of mining depth and the construction of large-scale underground engineering, the geological conditions are becoming more and more complex, and the surrounding rock often shows the characteristics of large deformation. When the deformation of the surrounding rock is large and exceeds the range that the anchor cable can bear, it will lead to the failure of the anchor cable, and then cause the instability and destruction of the underground engineering. In this case, it is required that the anchor cable used can be stretched without being dama...

AI Technical Summary

Problems solved by technology

The allowable deformation of the above-mentioned devices is generally small and cannot adapt to the characteristics of large deformation. However, the device with a large allowable deformation can provide insufficient effective resistance and unstable performance, and cannot meet the support needs of modern underground engineering.

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