CN219220466U - Hollow grouting anchor rod - Google Patents

Abstract

The utility model discloses a hollow grouting anchor rod, which relates to the technical field of coal mining roadway support and comprises an anchor rod main body, wherein a check valve is arranged at the top end thread of the anchor rod main body, two spherical protrusions are arranged on the outer surface of the anchor rod main body, two mounting rings are sleeved on the outer side of the anchor rod main body, four expansion steel sheets are fixedly arranged at the top of each mounting ring at equal intervals in circumference, and a connecting ring is fixedly arranged between the four expansion steel sheets at the top of each mounting ring. According to the utility model, after the anchor rod main body is inserted into the hole, the spherical protrusion enters the extrusion sleeve by rotating the anchor rod main body, the extrusion sleeve is separated and drives the connecting ring and the expansion steel sheet to deform, the connecting ring plays a role of continuously supporting the expansion steel sheet, and the expansion steel sheet tightly abuts against the inner wall of the hole, so that surrounding rocks on the inner wall of the hole are restrained rapidly, stress arches are formed on the surrounding rocks, and deformation of the surrounding rocks is controlled timely.

Description

A hollow grouting anchor

technical field

The utility model relates to the technical field of roadway support in coal mining, in particular to a hollow grouting bolt.

Background technique

At present, the mining depth of my country's coal mines is increasing, the rock burst is obvious, the rock mass is severely broken, more and more geological fracture zones are encountered, and roadway bolt support is becoming more and more difficult. The increase has put forward higher requirements for the roadway support means and the support strength of the anchor rod.

Some existing grouting bolts are inserted into the holes drilled in the roadway, and the anchoring effect needs to be solidified after the grout reaches a certain strength. If the front deforms, the anchor will easily lose its supporting effect. Therefore, we propose a hollow grouting anchor.

Utility model content

The purpose of the utility model is to solve the defects in the prior art, and propose a hollow grouting anchor.

In order to achieve the above object, the utility model adopts the following technical solutions:

A hollow grouting anchor, comprising an anchor body, a check valve is threadedly mounted on the top end of the anchor body, two spherical protrusions are arranged on the outer surface of the anchor body, and the outer surface of the anchor body There are two installation rings, the tops of the two installation rings are fixedly installed with four expansion steel sheets equidistant from the circumference, and the four expansion steel sheets at the top of each installation ring are fixedly installed with a connection ring;

Extrusion sleeves are installed inside the four expansion steel sheets at the top of each installation ring, and the two extrusion sleeves are sleeved on the outer surface of the main body of the anchor rod.

Further, a backing plate is sheathed above the outer surface of the main body of the anchor rod, and a nut is threadedly mounted on the outer surface of the main body of the anchor rod, and the nut is located on the top of the backing plate.

Further, the outer surface of the anchor rod body is provided with threads.

Further, one side of the connecting ring is provided with a notch for expansion.

Further, the inner diameters of the two extrusion sleeves are gradually reduced from bottom to top, and both sides of the two extrusion sleeves are provided with through grooves for separation.

Further, a plurality of inclined non-return plates are fixedly installed on the sides of the eight expanded steel sheets away from the main body of the anchor rod.

Compared with the prior art, the utility model has the beneficial effects of:

1. After inserting the main body of the anchor rod into the hole, rotate the main body of the anchor rod so that the spherical protrusion enters the inside of the extrusion sleeve, the extrusion sleeve separates and drives the deformation of the connecting ring and the expansion steel sheet, and the connection ring will press the expansion steel sheet It plays the role of continuous support, and the expanded steel sheet will be in close contact with the inner wall of the hole, so as to quickly restrain the surrounding rock on the inner wall of the hole, make the surrounding rock form a stress arch, and then control the deformation of the surrounding rock in time.

2. When grouting, it is necessary to screw the grouting anchor rod into the hole, and use the backing plate to block the hole, fix the backing plate with nuts, and finally connect the grouting pipe to the check valve, and then it can The grouting operation is carried out to the inside of the hole, and the set check valve can play the role of grouting non-return, so as to avoid the backflow of the grout inside the main body of the bolt.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, and are used to explain the utility model together with the embodiments of the utility model, and do not constitute a limitation to the utility model.

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is the enlarged structural schematic diagram of place A in Fig. 1 of the present utility model;

Fig. 3 is a partial structural schematic diagram of the utility model.

In the figure: 1. Bolt main body; 2. Backing plate; 3. Check valve; 4. Nut; 5. Squeeze sleeve; 6. Spherical protrusion; 7. Expansion steel sheet; Ring; 10, non-return plate.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention;

Referring to Figures 1-3, a hollow grouting anchor includes an anchor body 1, the outer surface of the anchor body 1 is provided with threads, the outer surface of the anchor body 1 is provided with two spherical protrusions 6, the anchor body The outer side of 1 is provided with two mounting rings 9, the two mounting rings 9 are respectively above the two spherical protrusions 6, and the tops of the two mounting rings 9 are fixedly installed with four expansion steel sheets 7 equidistant from the circumference, each Connecting rings 8 are fixedly installed between the four expansion steel sheets 7 at the top of the installation ring 9; extrusion sleeves 5 are installed inside the four expansion steel sheets 7 at the top of each installation ring 9, two extrusion sleeves 5 They are all sleeved on the outer surface of the main body 1 of the anchor rod. The side of the eight expansion steel sheets 7 away from the main body 1 of the anchor rod is fixedly installed with a plurality of inclined non-return plates 10. The inner diameters of the two extrusion sleeves 5 are from bottom to top. Gradually shrinking, both sides of the two extrusion sleeves 5 are provided with through grooves for separation, and one side of the connecting ring 8 is provided with a gap for expansion.

When grouting is required after the hole is drilled in the roadway, the main body of the anchor rod 1 can be inserted into the hole. Difficulty moving out of the hole;

Afterwards, the staff rotates the main body of the anchor rod 1, so that the spherical protrusion 6 moves backward, and the spherical protrusion 6 will enter the inside of the extrusion sleeve 5, so that the extrusion sleeve 5 is separated and drives the deformation of the connecting ring 8 and the expansion steel sheet 7, The connecting ring 8 will continue to support the expansion steel sheet 7, and the expansion steel sheet 7 will be in close contact with the inner wall of the hole, so as to quickly restrain the surrounding rock on the inner wall of the hole, make the surrounding rock form a stress arch, and then control the deformation of the surrounding rock in time .

A check valve 3 is installed on the top thread of the anchor rod body 1, a backing plate 2 is sleeved above the outer surface of the anchor rod main body 1, and a nut 4 is installed on the top thread of the outer surface of the anchor rod body 1, and the nut 4 is located at the bottom of the backing plate 2. top;

When grouting, the grouting anchor rod 1 needs to be screwed into the hole, and the backing plate 2 is used to block the hole, the backing plate 2 is fixed by the nut 4, and finally the grouting pipe is connected with the check valve 3 , the grouting operation can be carried out to the inside of the hole, and the installed check valve 3 can play the role of grouting non-return, so as to avoid the backflow of the grout inside the bolt main body 1 .

Claims (6)

1. A hollow grouting bolt, comprising a bolt body (1), characterized in that a check valve (3) is installed on the top thread of the bolt body (1), and the bolt body (1) Two spherical protrusions (6) are provided on the outer surface of the anchor rod main body (1), and two mounting rings (9) are sheathed on the outer side of the anchor rod body (1), and the tops of the two mounting rings (9) are equidistantly fixed on the circumference Four expansion steel sheets (7) are installed, and connecting rings (8) are fixedly installed between the four expansion steel sheets (7) at the top of each installation ring (9); Extrusion sleeves (5) are installed inside the four expansion steel sheets (7) at the top of each installation ring (9), and the two extrusion sleeves (5) are sleeved on the anchors. The outer surface of the rod body (1). 2. A hollow grouting anchor according to claim 1, characterized in that a backing plate (2) is sheathed above the outer surface of the anchor main body (1), and the anchor main body (1) A nut (4) is threadedly installed on the upper surface of the outer surface, and the nut (4) is located on the top of the backing plate (2). 3. A hollow grouting anchor according to claim 1, characterized in that, the outer surface of the anchor main body (1) is provided with threads. 4. A hollow grouting anchor according to claim 1, characterized in that, one side of the connecting ring (8) is provided with a notch for expansion. 5. A hollow grouting anchor according to claim 1, characterized in that the inner diameters of the two extrusion sleeves (5) gradually decrease from bottom to top, and the inner diameters of the two extrusion sleeves (5) There are through grooves for separation on both sides. 6. A hollow grouting anchor according to claim 1, characterized in that, the sides of the eight expanded steel sheets (7) away from the anchor main body (1) are all fixedly installed with a plurality of inclined the non-return plate (10).

Images