A high elongation composite anchor cable and its installation method

Abstract

The invention discloses a combined anchor cable with high elongation and a mounting method thereof. The combined anchor cable comprises a cable body, a high-elongation sleeve, a lockset, a tray, embedded cards, an annular spring and the like and has the characteristics of high overall elongation and reliable working state. The top end of the cable body is anchored in the deep part of a drill hole; the high-elongation sleeve sleeves the tail end of the cable body; the cable body and the high-elongation sleeve constitute a compact connection structure by virtue of the embedded cards; the annular spring ensures that the embedded cards are regularly arrayed on the cable body during installation, the lockset is fastened in the tail end of the high-elongation sleeve, so that the tray is clung to the surrounding rock. The extreme breaking force of the high-elongation sleeve is equal to 80% of that of the cable body; the outer side of the high-elongation sleeve is provided with a pawl structure matched with the drilling diameter of a shallow part. Meanwhile, a split installation method of the high-elongation sleeve and the cable body is adopted for the cable, so that the cable is convenient to install and fasten and has favorable promotion prospect.

Description

technical field [0001] The invention belongs to the technical field of large-deformation roadway (tunnel) surrounding rock control, and specifically relates to a high-elongation composite anchor cable with high overall elongation, reliable working state, and convenient separation and installation, and an installation method thereof. Background technique [0002] In recent years, with the continuous increase of mining depth and complex geological conditions, many disadvantages of anchor cables have been exposed. One of the most serious problems is that the elongation rate is too low. Taking coal mine roadway support as an example, it is inevitable to encounter areas with severe deformation of rock strata during construction. In engineering technology, anchor cables are mostly used for support, that is, anchor cables are driven in to control the deformation of surrounding rock. In the process of large deformation of the surrounding rock, although the anchor cable can withstand...

AI Technical Summary

Problems solved by technology

In the process of large deformation of the surrounding rock, although the anchor cable can withstand extremely high tensile force, the elongation rate of the anchor cable is also extremely high, while the standard elongation rate of the ordinary anchor cable is less than 3%, which is far from meeting the use requirements.

In the large deformation roadway, the anchor cable support often breaks or the anchorage fails due to poor elongation performance, resulting in frequent roof accidents

At present, the method of increasing the support strength to control the large deformation of the surrounding rock is not only a waste of material but also very unstable. For roadway (tunnel) support, increasing the elongation rate of anchor cables has become a hot issue

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