Check anti-water-bursting grouting rock bolt

Abstract

A check anti-water-bursting grouting rock bolt comprises a grouting pipe, a hole wall plugging apparatus and a grout ejection hole which is arranged on the grouting pipe. A hole check valve is arranged in the grouting pipe and composed of a check valve screw, a spring adjustment nut, a compression spring stopping sheet, a compression spring, a locating check ring, a pin base, a fast screw pin, a closed sleeve and a closed ball. The grouting pipe is provided with a through hole, the closed sleeve is fixed on the grouting pipe through the fast screw pin, the pin base is arranged outside the closed sleeve and provided with a mounting hole, the locating check ring is arranged outside the mounting hole of the pin base, the check valve screw is connected with the closed ball through the mounting hole of the pin base and the locating check ring, the compression spring is arranged on the check valve screw, the compression spring stopping sheet is arranged outside the compression spring, and the spring adjustment nut is arranged outside the compression spring. The check anti-water-bursting grouting rock bolt is provided with pressure maintaining and anti-water-bursting functions, capable of being stored separately and machined and mounted rapidly, wide in source, low in cost and capable of performing grouting in a sectional and adjustable mode.

Description

technical field [0001] The invention relates to the field of drilling and grouting in mines and geotechnical engineering, and is suitable for waterproof grouting and high-pressure crack grouting that require rapid plugging and pressure maintaining and backstopping functions. Grouting anchor. Background technique [0002] Bolt grouting technology is widely used in engineering fields such as coal mine shafts, tunnels, slopes and building foundations, and has good technical and economic effects for strengthening surrounding rock and sealing cracks. In the installation of grouting bolts, there are mainly two types of plugging between the rod body and the hole wall: 1) Resin drug coil or cement drug coil anchoring, which not only seals the hole wall, but also positions the anchor rod. It is difficult to guarantee that if the hole wall is not well formed or there is water leakage, the material consumption will increase exponentially, and it will even be difficult to seal; 2) The ...

AI Technical Summary

Problems solved by technology

In the installation of grouting bolts, there are mainly two types of plugging between the rod body and the hole wall: 1) Resin drug coil or cement drug coil anchoring, which not only seals the hole wall, but also positions the anchor rod. It is difficult to guarantee that if the hole wall is not well formed or there is water leakage, the material consumption will increase exponentially, and it will even be difficult to seal; 2) The conical compression rubber sleeve is sealed, and the conical head is welded to the hole of the rod body. The rubber sleeve of the tapered hole is used to seal the hole, which is complicated to process and consumes a lot of materials

The grouting pipe itself does not have the function of stopping the grouting. Generally, after the grouting is completed, the grouting hole is closed with a plug or cotton thread. When the grouting is upward, high-pressure grouting or under the action of a large water pressure, the operation is difficult and there is a grouting injury. human danger

For some grouting bolts installed with check valve, the gasket slides on the guide shaft, and the effect of reverse grouting and pressure holding is limited. The installation requires cutting and welding of large and small pipes to limit the check valve. The welding process is complicated and the quality Unstable, which greatly weakens the rod body strength of the orifice section

Some bolts are stacked on the construction site for a long time, and the pressure spring in the check valve will lose its elasticity due to corrosion, which will affect its function

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