A Multi-point Yield Grouting Anchor Rod Used for Supporting Deep Sectional Fractured Roadway

Abstract

The invention discloses a multipoint yield grouting anchor rod used for deep partition rupture roadway supporting. The multipoint yield grouting anchor rod comprises a main anchor rod body, an auxiliary anchor rod body, a tail anchor rod body, yield grouting connecting pieces, constant-resistance yield rods, a telescopic slurry conveying hose and a grouting indicator. One end of the main anchor rod body is sequentially in fastening connection with an installation anchor rod base plate, a tray and a fastening nut. The other end of the main anchor rod body, one yield grouting connecting piece, one constant-resistance yield rod, one yield grouting connecting piece, the auxiliary anchor rod body, one yield grouting connecting piece, one constant-resistance yield rod, one yield grouting connecting piece and the tail anchor rod body are integrally connected in sequence through threads. The telescopic slurry conveying hose is used for connecting water holes in the yield grouting connecting pieces with water holes in the constant-resistance yield rods. According to the multipoint yield grouting anchor rod used for deep partition rupture roadway supporting, independent and multipoint constant-resistance yield control can be conducted on deep roadway surrounding rock with a partition rupture phenomenon, the anchor rod tensile failure phenomenon caused by stress concentration is not prone to occurring, and a good supporting effect on a partition rupture roadway is achieved.

Description

technical field [0001] The invention relates to a multi-point yielding grouting anchor rod, in particular to a multi-point yielding grouting anchor rod used for support of deep subregional cracked roadways. Background technique [0002] With the decrease of shallow resources and the gradual expansion of human living space, many underground projects under construction and planning continue to go deep; at present, underground roadways for mining resources at home and abroad, underground tunnels for transportation construction and underground caves for hydropower development Chambers and so on have reached a depth of more than one thousand meters. For the deep underground engineering of coal mines, with the increase of mining depth, the ground stress is getting bigger and bigger, and the surrounding rock of the roadway is under the harsh conditions of high stress, high osmotic pressure, high temperature and affected by mining, which leads to the destruction of deep caverns And...

AI Technical Summary

Problems solved by technology

[0005] 1. For general grouting anchors, such as the patent CN201520411862.3, the grouting anchor can perform multiple pressure yields but cannot perform zone yielding, and is not suitable for zoned cracked roadways; 2. Surrounding rock zoned cracks have a strong time effect, it is required to grasp the timing of grouting, too early or too late is unfavorable, but the current grouting bolts are difficult to accurately obtain the best time for surrounding rock support; 3, deep tunnel surrounding rock partition rupture The range is often wide, and it is difficult to meet the anchoring requirements in the general bolt reinforcement range

4. At present, for the grouting of partition rupture, long and short combined grouting pipes or hollow segmented spiral grouting anchors are mostly used, but the combination of long and short grouting pipes requires more drilling holes, and the hollow segmented spiral grouting anchors cannot Adjust the position of the grouting hole according to the specific situation on site

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