Grouting anchor rod assembly for reinforcing middle clamping rock pillar

Abstract

The grouting anchor rod assembly comprises a hollow anchor rod, threads are arranged on the peripheral side of the hollow anchor rod, a threaded cylinder is connected to the outer side of the hollow anchor rod in a threaded mode, a centering chuck is installed on the side face of the end, inserted into an end anchor rod hole, of the threaded cylinder, and a discharging outer hole is formed in the side face, close to the centering chuck, of the threaded cylinder. A discharging inner hole is formed in the position, corresponding to the discharging outer hole, of the hollow anchor rod. According to the grouting anchor rod assembly for reinforcing the sandwiched rock pillar, centering operation can be conducted on the hollow anchor rod, grouting can be conducted on the side edge and the bottom of the hollow anchor rod, the grouting speed can be increased, and therefore the working efficiency is improved, operation is easy, and use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a grouting anchor rod assembly for reinforcing a rock column. Background Art

[0002] One of the keys to overall safety in close-spacing tunnel construction is ensuring the stability of the central rock pillar. This is especially true in geological environments with weak surrounding rock. Even if the distance between the left and right tunnel faces of a close-spacing tunnel meets regulatory requirements, the central rock pillar still requires reinforcement to ensure tunnel safety. Numerous studies have shown that hollow anchor grouting is the most effective method for reinforcing the central rock pillar in Class V surrounding rock, significantly enhancing its overall stability.

[0003] Grouting reinforcement is to inject slurry with certain strength and cementing properties into the cracks or pores of the rock column through a certain pressure and path, expel the filled air and water, cement the loose or cracked rock into a whole, improve the mechanical indicators of the rock, and thus enhance the bearing capacity of the rock column.

[0004] The existing hollow grouting anchor cannot be kept in the middle of the anchor hole when inserted into the anchor hole, and grouting can only be done from the tail of the hollow grouting anchor, so that the slurry can only move slowly upward from the bottom of the anchor hole, resulting in slow grouting speed, low work efficiency and inconvenience in use. Utility Model Content

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a grouting anchor rod assembly for reinforcing the rock column in the middle. The hollow anchor rod can be centered and grouting can be performed from the side and bottom of the hollow anchor rod, which can increase the grouting speed and thus improve work efficiency. The operation is simple and easy to use, and can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a grouting anchor assembly for reinforcing a rock column, comprising a hollow anchor with a thread on the outer peripheral side, the outer thread of the hollow anchor being connected to a threaded barrel, a centering chuck being installed on the side of one end of the anchor hole inserted into the threaded barrel, and an outer discharge hole being provided on the side of the threaded barrel close to the centering chuck, and an inner discharge hole being provided at a position of the hollow anchor corresponding to the outer discharge hole.

[0007] As a preferred technical solution of the present invention, the size of the outer discharge hole is larger than the size of the inner discharge hole.

[0008] As a preferred technical solution of the present invention, threads are provided on the outer circumference of the threaded barrel, and the centering chuck is threadedly connected to the outer side of the threaded barrel.

[0009] As a preferred technical solution of the present invention, a sealing plug is threadedly connected to the side of the threaded barrel near the opening of the anchor hole.

[0010] As a preferred technical solution of the present invention, a threaded vent hole is provided on the sealing plug.

[0011] As a preferred technical solution of the present invention, a pad is provided on the side movable sleeve of the hollow anchor rod located outside the anchor rod hole.

[0012] As a preferred technical solution of the present invention, the side surface of the hollow anchor rod is threadedly connected with a nut for locking the base plate.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The grouting anchor rod assembly for reinforcing the rock column in the example of the utility model can perform centering operations on the hollow anchor rod, and can also perform grouting from the side and bottom of the hollow anchor rod, which can increase the grouting speed, thereby improving work efficiency, and is simple to operate and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a right side structural schematic diagram of the present utility model;

[0017] Figure 3 This is a schematic structural diagram of the hollow anchor rod and the threaded barrel in the utility model;

[0018] Figure 4 It is a structural diagram of the utility model when in use.

[0019] In the figure: 1 hollow anchor rod, 2 threaded barrel, 3 inner discharge hole, 4 outer discharge hole, 5 centering chuck, 6 sealing plug, 61 threaded vent hole, 7 pad, 8 nut. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1-4The utility model provides a technical solution: a grouting anchor assembly for reinforcing a rock column, comprising a hollow anchor 1 with a threaded outer circumference, a threaded barrel 2 connected to the outer thread of the hollow anchor 1, a centering chuck 5 installed on the side of one end of the anchor hole where the threaded barrel 2 is inserted, and a discharge outer hole 4 is opened on the side of the threaded barrel 2 close to the centering chuck 5, a discharge inner hole 3 is provided at the position corresponding to the discharge outer hole 4 of the hollow anchor 1, and the hollow anchor 1 and the threaded barrel 2 are inserted into the anchor hole, at which time the discharge inner hole 3 is offset from the discharge outer hole 4. A fixed angle is set so that the two are not connected, the grouting pipe is connected to the hollow anchor rod 1, and the cement mortar is injected into the anchor rod hole through the insertion end of the hollow anchor rod 1 using a grouting pump; after a certain amount of cement mortar is injected, the threaded barrel 2 is rotated to make the outer discharge hole 4 correspond to the inner discharge hole 3, and the cement mortar is now injected into the anchor rod hole through the inner discharge hole 3 and the outer discharge hole 4. In this state, cement slurry sand enters the anchor rod hole from the middle and bottom at the same time, which can improve work efficiency. During the grouting process, the air in the anchor rod hole is discharged through the threaded vent hole 61.

[0022] Furthermore, the size of the outer discharge hole 4 is larger than the size of the inner discharge hole 3, which facilitates the grouting operation.

[0023] Furthermore, a thread is provided on the outer peripheral side of the threaded barrel 2, and the centering chuck 5 is threadedly connected to the outside of the threaded barrel 2. The threaded barrel 2 with the centering chuck 5 and the sealing plug 6 is threadedly connected to the hollow anchor rod 1. The centering chuck 5 can have a centering effect on the threaded barrel 2 and the hollow anchor rod 1.

[0024] Furthermore, a sealing plug 6 is threadedly connected to the side of the threaded barrel 2 near the opening of the anchor hole.

[0025] Furthermore, a threaded vent hole 61 is provided on the sealing plug 6. When cement slurry flows out of the threaded vent hole 61, it indicates that the grouting inside the anchor hole is completed. The threaded vent hole 61 is cleaned and sealed by an external screw.

[0026] Furthermore, a side movable sleeve of the hollow anchor rod 1 located outside the anchor rod hole is provided with a pad 7, and a nut 8 for locking the pad 7 is threadedly connected to the side of the hollow anchor rod 1. The pad 7 is put on the outside of the hollow anchor rod 1, and the nut 8 is threadedly connected to the hollow anchor rod 1 to lock the pad 7.

[0027] When using:

[0028] like Figure 4 As shown, the threaded barrel 2 with the centering chuck 5 and the sealing plug 6 is threadedly connected to the hollow anchor rod 1, and the hollow anchor rod 1 and the threaded barrel 2 are inserted into the anchor rod hole. At this time, the inner discharge hole 3 and the outer discharge hole 4 are offset by a certain angle so that the two are not connected;

[0029] Connect the grouting pipe to the hollow anchor rod 1, and use a grouting pump to inject cement mortar into the anchor rod hole through the insertion end of the hollow anchor rod 1;

[0030] After a certain amount of cement mortar is injected, the threaded barrel 2 is rotated so that the outer discharge hole 4 corresponds to the inner discharge hole 3. At this time, the cement mortar is injected into the anchor hole through the inner discharge hole 3 and the outer discharge hole 4. In this state, the cement mortar enters the anchor hole from the middle and bottom at the same time, which can improve work efficiency. During the grouting process, the air in the anchor hole is discharged through the threaded vent hole 61.

[0031] When cement slurry flows out of the threaded vent hole 61, it indicates that the grouting inside the anchor hole is completed, the threaded vent hole 61 is cleaned and sealed with an external screw;

[0032] Then, the backing plate 7 is put on the outside of the hollow anchor rod 1, and the nut 8 is threadedly connected to the hollow anchor rod 1, so as to lock the backing plate 7.

[0033] The utility model can perform centering operation on the hollow anchor rod 1, and can also perform grouting from two positions, the side and the bottom of the hollow anchor rod 1, which can increase the grouting speed, thereby improving work efficiency, and is simple to operate and easy to use.

[0034] The undisclosed parts of the present invention are all prior art, and their specific structures, materials and working principles will not be described in detail. Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A grouting anchor assembly for reinforcing a rock column, comprising a hollow anchor (1) with a threaded outer circumference, characterized in that: The outer side of the hollow anchor rod (1) is connected to a threaded barrel (2), a centering chuck (5) is installed on the side of one end of the threaded barrel (2) inserted into the anchor rod hole, and a discharge outer hole (4) is provided on the side of the threaded barrel (2) close to the centering chuck (5), and a discharge inner hole (3) is provided at a position of the hollow anchor rod (1) corresponding to the discharge outer hole (4).

2. The grouting anchor assembly for reinforcing a rock column according to claim 1, characterized in that: The size of the outer discharge hole (4) is larger than the size of the inner discharge hole (3).

3. The grouting anchor assembly for reinforcing a rock column according to claim 1, characterized in that: The outer peripheral side of the threaded barrel (2) is provided with threads, and the centering chuck (5) is threadedly connected to the outer side of the threaded barrel (2).

4. The grouting anchor assembly for reinforcing a rock column according to claim 1, characterized in that: The side surface of the threaded barrel (2) close to the opening of the anchor hole is threadedly connected with a sealing plug (6).

5. The grouting anchor assembly for reinforcing a rock column according to claim 4, characterized in that: The sealing plug (6) is provided with a threaded vent hole (61).

6. The grouting anchor assembly for reinforcing a rock column according to claim 1, characterized in that: A lateral movable sleeve of the hollow anchor rod (1) located outside the anchor rod hole is provided with a pad (7).

7. The grouting anchor assembly for reinforcing a rock column according to claim 6, characterized in that: The side surface of the hollow anchor rod (1) is threadedly connected to a nut (8) for locking the backing plate (7).

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