CN2926509Y - A grouting anchor - Google Patents

Abstract

The utility model relates to a grouting bolt, which is most suitable for the support of high-stress soft rock broken roadways affected by mining pressure. It includes a steel pipe rod body in the borehole, a grouting port at the end of the rod body, and a plurality of axially non-uniformly distributed radial grouting holes with large inner diameter and smaller outer diameter. The drill bit has a flat mouth and is in the shape of a duckbill, which is easy to push out the small gravel in the drill hole, so that the anchor rod can easily enter the drill hole. There is a tray at the end, and a threaded thread and nut to fix the tray. The entrance of the inner rod body is provided with a cement medicine roll and a retaining ring. The grouting holes are distributed non-uniformly in the axial direction of the rod body. They are processed in a tapered manner, narrow on the outside and wide on the inside. The grout is sprayed under pressure to improve the strength of the surrounding rock of the roadway and the anchoring force of the bolt, so that the grout is distributed more evenly. The bolt has high tensile strength, good sealing effect, good grouting effect, no increase in cost, simple structure, easy processing, convenient use, and wide practicability.

Description

A grouting anchor

technical field

The utility model relates to a grouting anchor rod, which is especially suitable for the grouting anchoring of the high-stress soft rock broken roadway whose surrounding rock of the mine underground roadway is affected by the mining pressure.

Background technique

With the improvement of the degree of mechanization of coal mines, the coal output continues to increase, the mining range and mining depth are also increasing, and the damage of the roadway section is becoming more and more serious, especially the roadway is arranged in high-stress soft rock and is affected by the mining stress. Mine construction and production bring more difficulties and pose a greater threat to the safety of underground operators. Practice has proved that using grouting bolts to grout the surrounding rock of the roadway is a reasonable and effective support method and a safe and reliable repair and reinforcement method. As a whole, it improves the strength of the surrounding rock; on the other hand, it provides a strong foundation for the rock mass through the full-length anchoring of the bolt. So as to achieve the purpose of controlling the stability of the roadway surrounding rock. Although the existing grouting bolts also have a certain anchoring effect, due to the disadvantages of the same grouting hole distance, flat hole opening, difficult construction in the broken rock mass drilling, low anchoring force, and poor sealing effect, etc., It affects the use effect of the grouting anchor.

Contents of the invention

Technical problem: The purpose of this utility model is to provide a grouting anchor rod with simple structure, good sealing effect, good grouting effect, and no increase in cost.

Technical solution: The utility model is a grouting anchor rod, which includes a steel pipe rod body set in the borehole, and a grouting port at the end of the rod body. A radial grouting hole with a large inner diameter and a smaller outer diameter. The solid drill bit of the rod body is flat and duckbill-shaped. There is a tray at the tail, and threaded screws and nuts for fixing the tray. The rod body in the drill hole A cement roll and a retaining ring are arranged at the entrance; the ratio of the inner diameter to the outer diameter of the non-uniformly distributed grouting holes along the axial direction is 1.1-1.5:1.

Beneficial effects: the utility model is a grouting bolt, which is most suitable for the support of high-stress soft rock broken roadways affected by mining pressure. Improvement on the basis of traditional grouting bolts, the grouting holes are distributed unevenly in the axial direction of the rod body, processed in a tapered manner, narrow on the outside and wide on the inside, using grout spraying under pressure to improve the strength of the surrounding rock of the roadway and enhance the anchoring of the bolt Compared with the existing technology: it is easy to construct in the drilling of broken surrounding rock, the distribution of grout is more uniform, the tensile strength is high, the sealing effect is good, the spraying effect is good, and the cost is not increased. Its structure is simple, easy to process, and it can be used Convenience and wide applicability.

Description of drawings

Fig. 1 is the utility model grouting bolt structural diagram.

Fig. 2 is a schematic diagram of the included angle of the grouting hole of the utility model.

Fig. 3 is a drill bit top view of the utility model grouting anchor.

Rod body 1; tray 2; nut 3; threaded thread 4; retaining ring 5; grouting hole 6; drill hole 7;

Detailed ways

An embodiment of the present utility model is further described below in conjunction with accompanying drawing:

The utility model is a grouting anchor rod, which is composed of a hollow rod body 1, a tray 2, a nut 3 and a drill bit 10. The tail of the hollow rod body 1 is processed with a screw thread 4, and the end is a grouting port 9. The hollow rod body 1 is There are multiple radial grouting holes 6 distributed unevenly in the axial direction. The inner diameter of the grouting holes 6 is larger than the outer diameter. If the ratio of the inner diameter to the outer diameter is 1.1:1, then when the outer diameter is 6mm , the diameter of the inner hole is 6.6mm, and so on, the ratio of the inner and outer holes can be adjusted according to the size of the slurry pressure. The solid drill bit 10 of the hollow rod body 1 is a flat mouth and is in the shape of a duckbill. The solid drill bit 10 and the rod body can be welded, or directly cold-worked and flanged on the steel pipe foundation of the anchor rod body. The tray 2 is arranged at the tail of the rod body 1, the nut 3 for fixing the tray 2 is arranged at the rear of the tray 2, the whole anchor rod is arranged in the borehole 7, and the entrance of the rod body 1 is provided with a cement medicine roll 8 and a retaining ring 5 to prevent injection. When slurrying, the slurry overflows.

Claims (2)

1. A kind of grouting bolt, it comprises the steel pipe rod body (1) that is located in borehole (7), is located at the grouting port (9) of hollow rod body (1) end, is characterized in that: described The rod body (1) is drilled with a plurality of radial grouting holes (6) that are axially non-uniformly distributed and have a large inner diameter and a smaller outer diameter. The solid drill bit (10) of the rod body (1) is flat and duckbill-shaped. The tail is provided with a tray (2), and is provided with a screw thread (4) and a nut (3) for fixing the tray (2), and a cement medicine roll ( 8) and retaining ring (5). 2. The grouting anchor according to claim 1, characterized in that: the ratio of the inner diameter to the outer diameter of the grouting holes (6) distributed non-uniformly in the axial direction of the rod body is 1.1-1.5:1.

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