Shell-expanding type hollow anchor rod

Abstract

The invention discloses a shell-expanding type hollow anchor rod comprising a hollow anchor rod body, an anchor head, an expanded shell and a steel plug. The hollow anchor rod body is in threaded connection with the tail end of the anchor head, and a mortar discharge port communicating with the interior of the hollow anchor rod body is formed in the front end of the anchor head. One end of the expanded shell is a fixed end, and the other end of the expanded shell is a clamp piece with an expanding-cracking seam. The fixed end of the expanded shell is fixed to the tail end of the anchor head, the steel plug is fixed to the hollow anchor rod body, and the front end of the steel plug is matched with the clamp piece of the expanded shell. Compared with the prior art, the shell-expanding type hollow anchor rod can be directly fed into the hole bottom to achieve the strength needed for tensioning, and the strength needed for tensioning is achieved without reciprocating pulling. By means of the method that the shell-expanding type hollow anchor rod is directly fed into the hole bottom, automatic mortar and gas discharging can be achieved, and the mortar and gas discharging effects are achieved without returning, so that the construction time is saved, and operation is more convenient and rapider. The problems that a traditional shell-expanding anchor rod does not automatically return and is prone to falling off when fed to the hole bottom, tensioning cannot be achieved, and as for a traditional mortar injecting mode, mortar cannot be fully injected, so that the engineering quality and strength are lowered are solved.

Description

technical field [0001] The invention relates to a grouting tool, in particular to a shell-expanding hollow bolt. Background technique [0002] The existing traditional shell-expanding hollow bolt is to fix the shell on the hollow anchor, and fix the steel plug to the anchor head, such as: CN 101054901A, a casing-expanding self-drilling hollow anchor, which After the anchor rod goes in, it is necessary to hold the anchor head against the bottom of the hole, and then turn the anchor rod clockwise or apply a pre-tightening force, so that the shell can expand and the hole is pressed to death, but there is a fatal problem, the anchor head is pressed to death Post-grouting will be difficult to carry out, so the anchor rod will be withdrawn by one grid for grouting, which is cumbersome, and the release of the anchor rod will cause loosening of the originally fastened expansion shell. In addition, the retraction force of the shell itself will also rebound the anchor rod, resulting ...

AI Technical Summary

Problems solved by technology

[0002] The existing traditional shell-expanding hollow bolt is to fix the shell on the hollow anchor, and fix the steel plug to the anchor head, such as: CN 101054901A, a casing-expanding self-drilling hollow anchor, which After the anchor rod goes in, it is necessary to hold the anchor head against the bottom of the hole, and then turn the anchor rod clockwise or apply a pre-tightening force, so that the shell can expand and the hole is pressed to death, but there is a fatal problem, the anchor head is pressed to death Post-grouting will be difficult to carry out, so the anchor rod will be withdrawn by one grid for grouting, which is more cumbersome, and the push-out of the anchor rod will cause loosening of the originally fastened expansion shell

In addition, the retraction force of the shell itself will also rebound the anchor rod, resulting in loose connection

Moreover, direct grouting from the hollow anchor rod to the bottom of the hole is likely to cause the inability to fill the mortar and lead to a decrease in the quality and strength of the project

There are also some hand-twisted shell-expanding hollow anchors, which need to be pushed and pulled back and forth many times, so many times idling wastes manpower

Moreover, the grouting of the traditional expansion shell anchor is grouted from the inside of the anchor, and the grout cannot be fed from the grouting machine.

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