An expandable anchor rod with an anchor head and its construction method

Abstract

The invention discloses an expandable anchor head anchor rod and a construction method thereof. The anchor head expandable anchor rod comprises an anchor head and a rod body. The anchor head is connected with the rod body through a bearing. The rod body can rotate with the bearing. It is connected with the support rod, the support rod is connected with the expandable framework, the expandable framework is connected with the bearing, and a spring is arranged on the rod body between the sleeve and the bearing. The construction method comprises the following steps: a. Drilling anchor holes with an anchor screw drilling rig; b. Prefabrication of anchor rods; c. Inserting anchor rods; d. Filling the anchor holes with grout and completing the anchor rod installation; Install it at the end of the rod body so that it is squeezed on the slope of the rock and soil body where the anchor rod is inserted; f, install bolts on one end of the rod body exposed at the end of the tray, tighten it, and the construction is completed. The invention is convenient to operate, firm and reliable; it can continuously enhance its own pull-out resistance during the tension process; it can effectively prevent the anchor rod from detaching from the soil body of the slope, and is beneficial to maintaining the stability of the slope.

Description

technical field [0001] The invention relates to geotechnical and geotechnical engineering equipment and a construction method thereof, in particular to an expandable anchor rod with an anchor head and a construction method thereof. Background technique [0002] Anchor is the main support form of roadway engineering, underground engineering, mining engineering and other foundation pits, and it is also the main support form in the process of slope excavation. In order to avoid the collapse or instability caused by the deformation of the formation, bolt reinforcement is usually used. In the bolt support process, the self-stability of the original soil and rock mass is fully utilized to obtain the reinforcement effect, and the high-strength tensile capacity of the bolt makes the stability of the rock-soil mass stronger. [0003] The authorized notification number is "CN 105822331 A", which discloses a resistance-increasing and pressure-increasing anchor rod. In this invention, ...

AI Technical Summary

Problems solved by technology

But the problem is: (1) the rod body cannot ensure that the force with the rock and soil body is sufficient to make the rod body elongated; (2) the uneven force on both sides of the bolt will cause the rod body to tilt, which is not conducive to the function of the anchor rod structure

[0004] In the current engineering application, the application of anchors has not achieved the desired effect. There is no good solution to the displacement caused by the sliding problem of rock and soil slopes. The current anchors cannot be adjusted in time according to the changes of the slope.

There are certain defects in the anchor rods currently used: (1) the deformation of the soil leads to the loosening of the anchor rods, which reduces its anchoring effect; (2) the ability to resist slippage is insufficient; (3) the ability to resist pullout is poor

Images