Small-pitch deformed steel bar anchor rod

Abstract

The utility model discloses a small-pitch deformed steel bar anchor rod, which belongs to the technical field of anchor rods and comprises a hollow anchor rod, an anchor head is fixedly connected to one end of the hollow anchor rod, a hexagon nut is in threaded connection with the outer surface of the hollow anchor rod, a base plate is sleeved on the outer surface of the hollow anchor rod, and a conical stop-grouting plug is sleeved on the outer surface of the hollow anchor rod. The outer surface of the hollow anchor rod is sleeved with a gasket, the gasket, the base plate and the conical stop-grouting plug are fastened, extruded and fixed to the outer wall of rock soil by rotating the hexagon nut, the spring is tightly extruded through the gasket, and the gap between the hollow anchor rod and the rock soil is tightly blocked by the base plate and the conical stop-grouting plug through resistance generated by extruding the spring. The conical stop-grouting plug is limited on one side of the base plate through the cooperation of the groove, the base plate can be automatically driven to move through the spring to ensure the tightness of the conical stop-grouting plug, and the conditions of filler backflow and leakage are avoided when the hexagon nut is loosened.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor rods, and more specifically to a small-pitch threaded steel anchor rod. Background Art

[0002] Threaded steel anchor rod is a component that uses a rod body processed from threaded steel and is used in rock or concrete structures to provide anchoring force. It is widely used in tunnel support, slope stabilization, deep foundation pit support, foundation reinforcement, mining support and other fields.

[0003] Existing threaded steel anchor rods are mostly made of high-strength threaded steel. The thread design on the surface can increase the friction with the surrounding medium and improve the anchoring effect. When in use, the anchor head is drilled into the rock and soil. The end of the anchor rod is enlarged by the pad and fixed by the nut to prevent loosening. After the anchor rod is installed, cement slurry or other anchoring materials are injected to enhance the combination of the anchor rod and the hole wall and improve the overall stability.

[0004] In actual use of the prior art, the pad at the tail end of the anchor rod is fixed by a nut. Since the nut is prone to loosening when subjected to vibration or external force collision, the tightness of the pad is reduced, resulting in backseepage and leakage of the injected filler. Therefore, a small-pitch threaded steel anchor rod is proposed. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] In view of the problems existing in the prior art, the utility model provides a small-pitch threaded steel anchor rod, which fastens and extrudes a gasket, a pad and a conical grouting plug on the outer wall of rock and soil by rotating the hexagonal nut, and tightly squeezes the spring through the gasket. The resistance force generated by the squeezing spring enables the pad and the conical grouting plug to tightly block the gap between the hollow anchor rod and the rock and soil. The conical grouting plug is limited to one side of the pad by a groove. When the hexagonal nut becomes loose, the pad can be automatically driven to move by the spring to ensure the tightness of the conical grouting plug, thereby avoiding backflow and leakage of the filler.

[0007] 2. Technical solution

[0008] To solve the above problems, the utility model adopts the following technical solutions.

[0009] A small pitch threaded steel anchor comprises a hollow anchor, one end of the hollow anchor is fixedly connected to an anchor head, the outer surface of the hollow anchor is threadedly connected to a hexagonal nut, the outer surface of the hollow anchor is sleeved with a pad, the outer surface of the hollow anchor is sleeved with a conical slurry stopper, and the outer surface of the hollow anchor is sleeved with a gasket.

[0010] Furthermore, an injection hole is provided on the outer surface of the anchor head, and the injection hole is communicated with the inner cavity of the hollow anchor rod.

[0011] Furthermore, the conical slurry stopper is made of elastic material, and a groove is provided on one side of the pad.

[0012] Furthermore, one side of the conical slurry stopping plug is located inside the groove, and one side of the pad is fixedly connected with a spring.

[0013] Furthermore, one end of the spring is fixedly connected to the gasket, and the spring is sleeved on the outer surface of the hollow anchor rod.

[0014] Furthermore, one side of the hexagonal nut is in contact with the gasket, and a plug is movably connected to the inner cavity of one end of the hollow anchor rod.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) This scheme fastens the gasket, pad and conical stop plug to the outer wall of the rock and soil by rotating the hexagonal nut, and tightly squeezes the spring through the gasket. The resistance generated by the squeezing spring makes the pad and conical stop plug tightly block the gap between the hollow anchor rod and the rock and soil. The conical stop plug is limited to one side of the pad by the groove. When the hexagonal nut becomes loose, the spring can automatically drive the pad to move to ensure the tightness of the conical stop plug, thereby avoiding the backflow and leakage of the filling material.

[0018] (2) In this scheme, the thread pitch of the outer surface of the hollow anchor rod is 3-6 mm, and the pitch is small, which can increase the contact area between the outer surface of the hollow anchor rod and the surface and the hole wall, thereby improving the friction resistance. It is suitable for use in loose, broken or low-strength rocks and soils. The plug is inserted into the tail of the hollow anchor rod to close the tail end of the hollow anchor rod to prevent the filling material from flowing out and prevent moisture and impurities from entering. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the overall structure of the utility model from a side view;

[0021] Figure 3 This is a half-section schematic diagram of the internal structure of the utility model;

[0022] Figure 4 It is a schematic diagram of the partial structure disassembly of the utility model.

[0023] Description of the numbers in the figure:

[0024] 1. Hollow anchor rod; 2. Anchor head; 3. Injection hole; 4. Conical slurry stop plug; 5. Pad; 6. Groove; 7. Spring; 8. Gasket; 9. Hexagonal nut; 10. Plug. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model without making creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] Example 1

[0029] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 , which is the first embodiment of the utility model, and provides a small pitch threaded steel anchor rod, including a hollow anchor rod 1, one end of the hollow anchor rod 1 is fixedly connected to an anchor head 2, the outer surface of the hollow anchor rod 1 is threadedly connected to a hexagonal nut 9, the outer surface of the hollow anchor rod 1 is sleeved with a backing plate 5, the outer surface of the hollow anchor rod 1 is sleeved with a conical grout stopper 4, and the outer surface of the hollow anchor rod 1 is sleeved with a gasket 8;

[0030] Specifically, an injection hole 3 is provided on the outer surface of the anchor head 2, and the injection hole 3 is connected to the inner cavity of the hollow anchor rod 1. The conical grout stopper 4 is made of elastic material, and a groove 6 is provided on one side of the backing plate 5. One side of the conical grout stopper 4 is located inside the groove 6. A spring 7 is fixedly connected to one side of the backing plate 5, and one end of the spring 7 is fixedly connected to the gasket 8. The spring 7 is sleeved on the outer surface of the hollow anchor rod 1, and one side of the hexagonal nut 9 abuts against the gasket 8. A plugging head 10 is movably connected to the inner cavity of one end of the hollow anchor rod 1.

[0031] Furthermore, the thread pitch of the outer surface of the hollow anchor rod 1 is 3-6mm, and the spacing is small, which can increase the contact area between the outer surface of the hollow anchor rod 1 and the surface and the hole wall, thereby improving the friction resistance. The anchor head 2 is umbrella-shaped and can better contact with the rock hole wall and the injected material. The hexagonal nut 9 is turned to fasten the gasket 8, the pad 5 and the conical grouting plug 4 to the outer wall of the rock and soil, and the spring 7 is tightly squeezed by the gasket 8. The conical grouting plug 4 is limited to one side of the pad 5 by the groove 6. The conical grouting plug 4 can prevent the slurry from flowing back. The plugging head 10 is inserted into the tail of the hollow anchor rod 1 to close the tail end of the hollow anchor rod 1 and prevent the filling material from flowing out.

[0032] Working principle: During the use of the device, the operator drills the hollow anchor rod 1 and the anchor head 2 into the rock and soil of the designated project through a drilling rig. The thread pitch of the outer surface of the hollow anchor rod 1 is 3-6mm, and the spacing is small, which can increase the contact area between the outer surface of the hollow anchor rod 1 and the surface and the hole wall, thereby improving the friction resistance. It is suitable for use in loose, broken or low-strength rocks and soils. The anchor head 2 is umbrella-shaped and can better contact with the rock and soil hole wall and the injected material, thereby improving the firmness of the hollow anchor rod 1. Then turn the hexagonal nut 9 to tighten the gasket 8, the pad 5 and the conical grouting plug 4 on the outer wall of the rock and soil, and squeeze the spring 7 tightly through the gasket 8. The resistance generated by squeezing the spring 7 makes the pad 5 and the conical grouting plug 4 tightly block the hollow. The conical grouting plug 4 is limited on one side of the pad 5 by the groove 6 in the gap between the anchor rod 1 and the rock and soil. When the hexagonal nut 9 becomes loose, the pad 5 can be automatically driven to move by the spring 7 to ensure the tightness of the conical grouting plug 4 and avoid the backflow and leakage of the filler. Then, cement slurry, resin or other anchoring materials are injected into the hollow anchor rod 1, and enter the hollow anchor rod 1 and the hole wall through the injection hole 3 to enhance the combination of the anchor rod and the surrounding rock and soil. The conical grouting plug 4 can prevent the slurry from flowing back and ensure that the slurry can fully fill the gap around the anchor rod. After the injection is completed, the plug 10 is inserted into the tail of the hollow anchor rod 1 to close the tail end of the hollow anchor rod 1 to prevent the filling material from flowing out and prevent moisture and impurities from entering.

[0033] The above is only a preferred specific implementation of the utility model; however, the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and improved ideas of the utility model within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model.

Claims

1. A small pitch threaded steel anchor rod, comprising a hollow anchor rod (1), characterized in that: One end of the hollow anchor rod (1) is fixedly connected to an anchor head (2); the outer surface of the hollow anchor rod (1) is threadedly connected to a hexagonal nut (9); the outer surface of the hollow anchor rod (1) is sleeved with a pad (5); the outer surface of the hollow anchor rod (1) is sleeved with a conical grouting stopper (4); the outer surface of the hollow anchor rod (1) is sleeved with a gasket (8); the conical grouting stopper (4) is made of elastic material; one side of the pad (5) is provided with a groove (6); one side of the conical grouting stopper (4) is located inside the groove (6); one side of the pad (5) is fixedly connected to a spring (7); one end of the spring (7) is fixedly connected to the gasket (8); the spring (7) is sleeved on the outer surface of the hollow anchor rod (1).

2. A small pitch threaded steel anchor according to claim 1, characterized in that: An injection hole (3) is provided on the outer surface of the anchor head (2), and the injection hole (3) is connected to the inner cavity of the hollow anchor rod (1).

3. The small pitch threaded steel anchor according to claim 1, characterized in that: One side of the hexagonal nut (9) is in contact with the gasket (8), and a plug (10) is movably connected to the inner cavity of one end of the hollow anchor rod (1).

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