A Three-Stage Anchor Combined Hollow Grouting Anchor

Abstract

The invention relates to a three-stage anchoring combined type hollow anchor rod for grouting. The anchor rod comprises anchor heads, a metal pressure ring (4), a front connector (5), a solid twisted steel rod body (6), a rear connector (8), a hollow grouting anchor rod body (9), a stop-grouting plug (10) provided with an exhaust porous channel and an flexible exhaust pipe (7). The anchor heads comprise the main anchor head (1) and the subsidiary anchor head (2), the main anchor head (1) is provided with a helical blade with the diameter increased gradually, and the rear end of the subsidiary anchor head (2) is provided with a thread; the anchor heads rotationally penetrate through the metal pressure ring (4) and then are fixedly connected with the solid twisted steel rod body (6) through the front connector (5); the rear connector is used for fixedly connecting the solid twisted steel rod body (6) with the hollow grouting anchor rod body (9), a grout outlet is formed in the side face of the rear connector, and the grout outlet is communicated with the interior of the hollow grouting anchor rod body (9). By means of the three-stage anchoring combined type hollow grouting anchor rod, the three-stage anchoring effect with the novel anchor heads, an anchoring agent, the anchor rod and mortar acting in a combined mode can be achieved.

Description

technical field [0001] The invention relates to a hollow grouting bolt supporting device, which is aimed at reinforcing and supporting surrounding rocks of building structures such as roads, railway tunnels and mines. Background technique [0002] With the rapid development of my country's economic construction, the demand for infrastructure construction such as transportation and energy development continues to increase. Tunnels and underground caverns are the main structural forms of roads, railway tunnels and mining projects, and their construction quality and safety are of great importance to the overall The safety, quality, schedule and economic benefits of the project have a decisive impact. [0003] In our country, the design and construction of tunnels and underground caverns generally adopt the New Austrian Method theory. This method is based on the existing tunnel engineering experience and rock mechanics theory. Shotcrete, bolting and on-site measurement are the t...

AI Technical Summary

Problems solved by technology

[0005] 1. When the anchoring agent anchors the bolt, because the anchoring agent still has fluidity in the initial stage, it is easy to cause the anchor to sink due to factors such as gravity, and cannot be anchored in the middle, and the thickness of the mortar protection layer does not meet the specification requirements

[0006] 2. Since it takes a certain amount of time for the anchoring agent to form strength, for weak and broken rock formations, the bolt cannot immediately work together with the anchoring agent to form the initial anchoring force, and the purpose of preventing the deformation of the rock mass and strengthening the support cannot be achieved in the first place

[0007] 3. The non-grouting section at the outer end of the hollow bolt is the anti-corrosion blind area of ​​the bolt body, which cannot guarantee the stable and effective work of the bolt body in the later stage

[0008] 4. After the anchoring agent is crushed by the anchor rod, it is difficult to fully stir and compact it, and it cannot be fully bonded with the surrounding rock mass, which affects the effective anchoring length of the anchoring agent section in the mid-term

[0009] 5. The contact surface between the backing plate at the outer end of the hollow anchor rod and the wall is too limited and direct, which is not conducive to the uniform force of the backing plate and the wall and the buffering of rock vibration.

[0010] 6. The grout stopper cannot guarantee good air tightness during grouting of anchor bolts, and it will leak air or even mortar, which cannot guarantee the effect of full pressure grouting

[0011] Based on the above defects in the existing hollow bolt support, it affects the long-term stable and effective support effect of the hollow bolt to the surrounding rock, and it needs to be improved to achieve higher technical and economic benefits

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