Underground powerhouse blasting construction anti-vibration anchor rod tail structure

Abstract

The utility model relates to underground powerhouse construction technical field, proposes an underground powerhouse blasting construction anti -vibration anchor rod tail structure, including anchor rod, the expansion sleeve is connected with the anchor rod upper end, the anchor rod lower extreme is equipped with support plate and anti -loosening nut in proper order, and the support plate is butt joint with reinforced structure surface, and the anti -loosening nut is connected with anchor rod screw thread and forms the axial locking to support plate. The side wall of anti -loosening nut is provided with the pole along the radial direction, and the pole is butt joint with the outer surface of anchor rod to restrict the rotation of anti -loosening nut. The inboard of anti -loosening nut is equipped with annular connecting groove, and the connecting groove is communicated with threaded connection area through through -hole, and is equipped with the pouring mouth that communicates with connecting groove on the side wall of anti -loosening nut, makes the glue can even enter the thread gap between anti -loosening nut and anchor rod and solidifies, forms cemented anti -loosening structure. The utility model can effectively improve the anti -loosening ability and the connection stability of anchor rod tail under the blasting vibration working condition, is applicable to the anchoring construction of high vibration environment such as underground powerhouse.

Description

Technical Field

[0001] This utility model relates to the field of underground powerhouse construction technology, and in particular to a vibration-damping anchor bolt tail structure for underground powerhouse blasting construction. Background Technology

[0002] Underground powerhouses are typically located within rock or concrete structures, and their excavation is mostly carried out using drilling and blasting methods. Compared to mechanical excavation, blasting significantly improves excavation efficiency and shortens the construction period, and is therefore widely used in underground powerhouses, underground caverns, and similar projects. However, while blasting releases a large amount of energy instantaneously, it also generates strong impact loads and continuous vibrations within the surrounding rock and the structure.

[0003] During underground powerhouse blasting construction, to ensure the stability of the surrounding rock and prevent local rock mass or structure from loosening or collapsing, anchor bolts are typically installed in key stress areas to reinforce the surrounding rock or structure. Existing anchor bolt structures used in underground engineering often employ a tail-locking method where a nut and support plate engage. Tightening the nut presses the support plate firmly against the surface of the surrounding rock or structure, forming a stable load-bearing system. However, in the blasting environment, the periodic vibrations and impact loads generated by blasting easily act on the anchor bolt tail connection, causing the nut to gradually loosen under long-term vibration. This reduces the clamping force of the support plate, affecting the overall reinforcement effect of the anchor bolt.

[0004] The existing anchor tail structure has limited ability to resist vibration and loosening, making it difficult to maintain a stable connection state for a long time under blasting construction conditions. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of the existing technology by providing a vibration-resistant anchor bolt tail structure for underground power plant blasting construction, thereby solving the problem mentioned in the background technology that vibrations generated during blasting construction can easily cause anchor bolt connections to loosen, leading to connection reinforcement failure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A vibration-damping anchor bolt tail structure for blasting construction of an underground powerhouse includes: an anchor bolt, an expansion sleeve fitted at the upper end of the anchor bolt, a support plate fitted at the lower end of the anchor bolt, and an anti-loosening nut threadedly connected to the outer surface of the anchor bolt below the support plate; the upper surface of the support plate abuts against the surface of the structure being reinforced; and the upper surface of the anti-loosening nut abuts against the lower surface of the support plate. At least one abutment is provided through the side wall of the anti-loosening nut, and the abutment passes through the anti-loosening nut radially and abuts against the outer surface of the anchor rod; The inner side of the anti-loosening nut is provided with an annular connecting groove, and the side wall of the anti-loosening nut is provided with a filling port communicating with the connecting groove. The connecting groove is connected to the inner wall of the anti-loosening nut through several through holes.

[0007] Preferably, a connecting block is fixedly connected to the inner wall of the anti-loosening nut, the connecting block is located on the radial through-path of the abutment rod along the anti-loosening nut, and the abutment rod passes through the connecting block and abuts against the outer surface of the anchor rod.

[0008] Preferably, the connecting groove has a circular structure, and the through holes are evenly distributed circumferentially along the inner wall of the anti-loosening nut.

[0009] Preferably, the injection port is disposed through the side wall of the anti-loosening nut in an inclined manner relative to the axis of the anti-loosening nut.

[0010] Preferably, the injection ports are evenly distributed in multiple locations along the circumferential direction of the connecting groove.

[0011] This utility model discloses a vibration-damping anchor bolt tail structure for underground powerhouse blasting construction, which has the following beneficial effects.

[0012] This utility model includes: an anchor rod, an expansion sleeve for in-hole anchoring at the upper end of the anchor rod, and a support plate and an anti-loosening nut sequentially arranged at the lower end of the anchor rod. The support plate abuts against the surface of the reinforced structure, and the anti-loosening nut is threadedly connected to the anchor rod and forms an axial lock on the support plate. A radially arranged abutment rod is provided on the side wall of the anti-loosening nut, which abuts against the outer surface of the anchor rod to restrict the rotation of the anti-loosening nut. An annular connecting groove is provided on the inner side of the anti-loosening nut, which communicates with the threaded connection area through a through hole. An injection port communicating with the connecting groove is provided on the side wall of the anti-loosening nut, allowing adhesive to uniformly enter the threaded gap between the anti-loosening nut and the anchor rod and cure, forming an adhesive anti-loosening structure. This utility model, through a combination of mechanical limiting and adhesive reinforcement, effectively improves the anti-loosening ability and connection stability of the anchor rod tail under blasting vibration conditions, and is suitable for anchoring construction in high-vibration environments such as underground power plants. Attached Figure Description

[0013] Figure 1 This is a schematic diagram showing the result after the present invention is installed.

[0014] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the structure of the abutment and anchor bolt of this utility model.

[0016] Figure 4 This is a cross-sectional schematic diagram of the anti-loosening nut of this utility model.

[0017] In the attached diagram: 1. Anchor bolt; 2. Expansion sleeve; 3. Support plate; 4. Anti-loosening nut; 41. Abutment rod; 42. Connecting block; 43. Injection port; 44. Connecting groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Example 1 Reference Figures 1 to 3 As shown, a tail structure of an anti-vibration loosening anchor rod 1 for blasting construction of an underground powerhouse includes: an anchor rod 1, an expansion sleeve 2 sleeved on the upper end of the anchor rod 1, a support plate 3 sleeved on the lower end of the anchor rod 1, and an anti-loosening nut 4 threadedly connected to the outer surface of the anchor rod 1 located below the support plate 3. The upper surface of the support plate 3 abuts against the surface of the reinforced structure; the upper surface of the anti-loosening nut 4 abuts against the lower surface of the support plate 3; In the installed state, the upper surface of the support plate 3 is in close contact with the surface of the surrounding rock or concrete structure to be reinforced, and the anti-loosening nut 4 is located on the lower side of the support plate 3, with its upper end face in contact with the lower surface of the support plate 3. Thus, the anti-loosening nut 4 applies an axial locking force to the support plate 3, so that the anchor rod 1 forms a reliable end constraint on the reinforced structure.

[0021] At least one abutment rod 41 is provided through the side wall of the anti-loosening nut 4. The abutment rod 41 passes through the anti-loosening nut 4 radially and abuts against the outer surface of the anchor rod 1. The abutment rod 41 applies a radial tightening force to the anchor rod 1, thereby limiting the rotation tendency of the anti-loosening nut 4 relative to the anchor rod 1, forming a mechanical anti-loosening limiting structure. The inner side of the anti-loosening nut 4 is provided with an annular connecting groove 44, and the side wall of the anti-loosening nut 4 is provided with a filling port 43 that communicates with the connecting groove 44. The connecting groove 44 is connected to the inner wall of the anti-loosening nut 4 through several through holes. When glue is injected into the filling port 43, the glue can first enter the connecting groove 44, and then evenly penetrate into the thread gap between the anti-loosening nut 4 and the anchor rod 1 through the through holes, so that the glue is fully distributed and cured in the circumferential direction, thereby forming a continuous adhesive layer between the threaded pairs to improve the vibration resistance and loosening ability between the anti-loosening nut 4 and the anchor rod 1.

[0022] Preferably, in this embodiment, to further improve the anti-loosening effect, the connecting groove 44 has a circular structure, and the through holes are evenly distributed along the inner circumference of the anti-loosening nut 4 to ensure that the glue can flow evenly and fully fill the threaded connection area.

[0023] In this embodiment, during actual use, drilling is first performed on the surrounding rock or concrete structure of the underground powerhouse to form an installation hole matching the size of the anchor rod 1. Then, the expansion sleeve 2 is fitted onto the upper end of the anchor rod 1, and the anchor rod 1, together with the expansion sleeve 2, is inserted into the installation hole. The expansion sleeve 2 expands within the hole and forms a radial compression fit with the hole wall, thus forming a stable anchoring section. After the lower end of the anchor rod 1 extends out of the hole, the support plate 3 is fitted onto the outside of the anchor rod 1, with its upper surface abutting against the surface of the reinforced structure. Then, the anti-loosening nut 4 is screwed onto the external thread of the anchor rod 1, causing the anti-loosening nut 4 to tighten against the support plate 3, achieving axial locking of the tail end of the anchor rod 1.

[0024] After the threaded locking is completed, the abutment rod 41 is screwed in, so that the inner end of the abutment rod 41 is tightly abutted against the outer surface of the anchor rod 1, further restricting the rotational freedom of the anti-loosening nut 4. Then, glue is injected into the connecting groove 44 through the injection port 43, so that the glue enters the thread gap between the anti-loosening nut 4 and the anchor rod 1 through the through hole. After the glue cures, it forms a multi-restraint structure, which can effectively suppress the loosening of the connection part at the tail of the anchor rod 1 under blasting vibration conditions.

[0025] Example 2 like Figure 3 and Figure 4 As shown, based on Embodiment 1, this embodiment further optimizes the injection structure and the anti-loosening structure. The injection port 43 is installed through the side wall of the anti-loosening nut 4 in an inclined manner relative to the axis of the anti-loosening nut 4. This makes it easier for the glue to flow circumferentially along the connecting groove 44 during the injection process, reducing local stagnation or the generation of cavities, and improving the uniformity of glue injection.

[0026] Preferably, in this embodiment, the injection ports 43 are evenly distributed in multiple locations along the circumferential direction of the connecting groove 44, so that the glue can enter the connecting groove 44 from different positions, thereby shortening the injection path and improving the glue filling efficiency, which is especially suitable for application scenarios where the anchor rod 1 has a large diameter or a long thread length.

[0027] Preferably, in this embodiment, a connecting block 42 is fixedly connected to the inner wall of the anti-loosening nut 4. The connecting block 42 is located on the radial penetration path of the abutment rod 41 along the anti-loosening nut 4. The abutment rod 41 passes through the connecting block 42 and abuts against the outer surface of the anchor rod 1. The connecting block 42 guides and supports the abutment rod 41, which can improve the stability of the abutment rod 41 when it contacts the anchor rod 1, prevent the abutment rod 41 from tilting or local stress concentration under vibration conditions, and thus further enhance the overall anti-loosening reliability.

[0028] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Substitutions may include replacements for some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the scope of protection of this utility model.

Claims

1. A vibration-damping anchor bolt tail structure for underground powerhouse blasting construction, comprising an anchor bolt, characterized in that: An expansion sleeve is fitted to the upper end of the anchor rod, and a support plate is fitted to the lower end of the anchor rod. An anti-loosening nut is threadedly connected to the outer surface of the anchor rod below the support plate. The upper surface of the support plate abuts against the surface of the reinforced structure. The upper surface of the anti-loosening nut abuts against the lower surface of the support plate. At least one abutment is provided through the side wall of the anti-loosening nut, and the abutment passes through the anti-loosening nut radially and abuts against the outer surface of the anchor rod; The inner side of the anti-loosening nut is provided with an annular connecting groove, and the side wall of the anti-loosening nut is provided with a filling port communicating with the connecting groove. The connecting groove is connected to the inner wall of the anti-loosening nut through several through holes.

2. The anti-vibration loosening anchor bolt tail structure for blasting construction of an underground powerhouse according to claim 1, characterized in that, A connecting block is fixedly connected to the inner wall of the anti-loosening nut. The connecting block is located on the radial penetration path of the abutment rod along the anti-loosening nut. The abutment rod passes through the connecting block and abuts against the outer surface of the anchor rod.

3. The anti-vibration loosening anchor bolt tail structure for blasting construction of an underground powerhouse according to claim 1, characterized in that, The connecting groove has a circular structure, and the through holes are evenly distributed circumferentially along the inner wall of the anti-loosening nut.

4. The anti-vibration loosening anchor bolt tail structure for blasting construction of an underground powerhouse according to claim 1, characterized in that, The injection port is installed through the side wall of the anti-loosening nut in an inclined manner relative to the axis of the anti-loosening nut.

5. The anti-vibration loosening anchor bolt tail structure for underground powerhouse blasting construction according to claim 4, characterized in that, The injection ports are evenly distributed in multiple locations along the circumferential direction of the connecting groove.

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