Hollow anchor rod having functions of geological detection and anchoring and exhaust and grouting method of hollow anchor rod

Abstract

The invention discloses a hollow anchor rod having functions of geological detection and anchoring and an exhaust and grouting method of the hollow anchor rod. The hollow anchor rod comprises an expansion-shell anchor head, an anchor rod, an expansion shell piece, an expansion shell, a steel plug, a grouting stop plug, a grouting pipe, a cushion plate, a nut and a plug head. The exhaust and grouting method comprises the ways that (1) the hollow anchor rod having the functions of geological detection and anchoring is downwards placed in an anchor hole formed by a drill when the hollow anchor rod is used for a side wall or a part with a downwards-inclining anchor hole, the bottom of the anchor hole is jacked up by the expansion-shell anchor head, and a process of performing grouting in the anchor rod and exhausting grout and gas at the anchor hole is employed; and (2) a process of performing grouting at the anchor hole by the grouting pipe and exhausting grout and gas through the expansion-shell anchor head is employed when the hollow anchor rod is used for an arc part or a part with a downwards-inclining anchor hole having a pitching angle larger than 30 degrees. The hollow anchor rod has high anchoring function, and the strength required by tension can be instantaneously achieved; moreover, the hollow anchor rod is convenient and safe to operate, and the construction safety risk is reduced; and the anchor head is flexible in expansion size, a forecast induction chip is convenient to install, and the forecast function of measuring geological disaster is achieved.

Description

technical field [0001] The invention belongs to geological exploration and building support technology, in particular to a hollow bolt with geological detection and anchoring functions and an exhaust grouting method thereof. Background technique [0002] Traditional anchors are generally simple hollow rods with anchor holes. After the anchor hole is drilled through the drill bit on the rock or building, put the traditional anchor rod into the anchor hole, inject mortar through the anchor rod hole where the anchor rod exposes the outer end of the anchor hole, and exhaust the gas from the small hole of the grout plug. Grout, grouting mortar and cuttings around the anchor hole can easily block the small hole of the grout stopper, resulting in poor exhaust, increased grouting pressure, and difficulty for the grout to enter the anchor hole, resulting in the anchor bolt in the anchor hole and The rock formations around the inner wall of the anchor hole cannot be connected as a wh...

AI Technical Summary

Problems solved by technology

After the anchor hole is drilled through the drill bit on the rock or building, put the traditional anchor rod into the anchor hole, inject mortar through the anchor rod hole where the anchor rod exposes the outer end of the anchor hole, and exhaust the gas from the small hole of the grout plug. Grout, grouting mortar and cuttings around the anchor hole can easily block the small hole of the grout stopper, resulting in poor exhaust, increased grouting pressure, and difficulty for the grout to enter the anchor hole, resulting in the anchor bolt in the anchor hole and The rock strata around the inner wall of the anchor hole cannot be connected as a whole, grouting cannot be realized, and the full-length bonding required by the design cannot be achieved

[0003] In addition, due to the defect in the design of the expansion head of the traditional expansion bolt, it needs to be pulled repeatedly to open, and its instantaneous pull-out resistance cannot meet the design requirements; The strength required for tensioning requires a lot of manpower during operation. First, more than three people need to send the anchor rod into the anchor hole and press the anchor rod, and another person needs to grout with a grouting machine, and worry about it all the time. The anchor rod will fall from the anchor hole, which poses a great risk to construction safety; and the traditional anchor rod cannot automatically adjust the expansion shell when it reaches the bottom of the anchor hole, and the opening size of the anchor head is limited. The prediction chip cannot be tightly combined with the rock formation and cannot be measured Changes in geological disasters, as well as information such as the density of grouting and the length of the anchor will cause the anchor to fall off in weak strata, making it impossible to achieve tension and geological prediction.

Images