Full-thread glass fiber composite hollow grouting anchor rod

Abstract

The invention discloses a full-thread glass fiber composite hollow grouting anchor rod which comprises a hollow grouting anchor rod which stretches into a rock-soil anchoring hole, wherein a grouting hole is formed in the hollow grouting anchor rod; the outer wall of the hollow grouting anchor rod is of a full-thread section; a slurry stopping plug and a locking nut, corresponding to the anchoring hole, are screwed on the hollow grouting anchor rod respectively; a taper body section is arranged at the front part of the locking nut; a support disc is matched on the taper body section; and the front end of the support disc is arranged on the rear end face of the slurry stopping plug in a compression mode. During the grouting of the anchor rod, slurry is fed back from the bottom of the anchor rod to an orifice, so that the slurry is grouted fully, fractures are filled better, rock and soil layers are combined, the high pressure grouting is realized so as to achieve the purposes of improving the surrounding rock and obstructing the ground water, and stress and pre-stress can be exerted conveniently.

Description

technical field [0001] The invention relates to the field of geotechnical anchoring engineering in the aspects of tunnel construction, side slope treatment, foundation pit arm protection, mining mining, etc., and specifically belongs to full-thread glass fiber composite hollow grouting anchor rods. Background technique [0002] With the intensification of infrastructure construction such as transportation and energy, in mining tunnels, basements and slopes, as an anchoring technology that can give full play to the self-stabilization ability of rock mass, it has developed rapidly, and the amount of anchor rods is increasing day by day, showing a broad development prospects. However, in the current anchor rod use process, there are the following problems: [0003] 1. Ordinary mortar anchors often adopt the process of grouting first and then inserting bars. Human factors have a great influence on the fullness of grouting. Especially when the construction is inclined upward...

AI Technical Summary

Problems solved by technology

[0003] 1. Ordinary mortar anchors often adopt the process of grouting first and then inserting bars. Human factors have a great influence on the fullness of grouting. Especially when the construction is inclined upward or the length is greater than 3.0m, the fullness of grouting is more difficult to guarantee. As a result, the actual effective anchorage area is far from the design requirements, and there is currently no effective method for testing the fullness of the mortar

The pullout test of the bolt cannot determine whether this kind of full-length bonded bolt meets the design requirements (because as long as the mortar is filled within a length not less than 25 to 35 times the diameter of the bolt body, under the action of the ultimate load There is always necking and damage to the rod steel)

Therefore, the currently widely used mortar bolts leave deep hidden dangers, and what is more dangerous is that usually this hidden danger is not noticed by people.

[0004] 2. Ordinary mortar anchors generally do not have backing plates and nuts (sometimes only backing plates are provided, but no nuts with threads), and cannot provide supporting plate force after the anchor is installed. The role of the anchor is completely passive. Only when the rock When the body is displaced, the anchor rod begins to play a sitting role.

This is not conducive to controlling the early loosening and displacement of the rock mass after excavation

[0005] 3. It is difficult to control the fullness of the mortar in the anchor rod construction. Pores, cavities, and exposed steel bars in boreholes are often unavoidable, providing a path for the intrusion of groundwater (especially groundwater containing corrosive media), resulting in corrosion of steel rods and seriously affecting the durability of anchors.

[0006] 4. When drilling in weak and broken rock mass and other unfavorable formations, after the drill pipe is pulled out, the hole collapse phenomenon often occurs, and the ordinary mortar bolt has poor coping ability

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