Anti-loosening adjustable anchor bolt assembly for power transmission tower foundation

Abstract

The utility model relates to the technical field of electric power engineering facility construction discloses a anti -loosening adjustable anchor bolt assembly for transmission tower foundation, including anchor bolt rod, rectangular steel sheet and set up on the multistage locking structure of anchor bolt rod, the anchor bolt rod outer wall is from top to bottom screw thread connection has first nut and second nut, the anchor bolt rod outer wall is below second nut and is sequentially equipped with first spring piece, second spring piece and second gasket, and first spring piece and second spring piece mutually adhere, the lower surface of second gasket and the rubber pad on the upper surface of rectangular steel sheet adhere, the rectangular steel sheet inside is equipped with screw hole for the anchor bolt rod screw thread connection. In the utility model, the three nut adjusting locking system of adjusting nut, main locking nut and auxiliary anti -loosening nut, the anchoring depth of anchor bolt rod in the concrete can realize accurate adjustment.

Description

Technical Field

[0001] This utility model relates to the field of power engineering facility construction technology, and in particular to an anti-loosening adjustable anchor bolt assembly for power transmission tower foundations. Background Technology

[0002] Transmission towers must withstand various complex loads, including wind loads, ice loads, and conductor tension, during long-term operation. The stability of their foundations directly affects the safety and durability of the overall structure. As a crucial component connecting the tower body and the foundation, anchor bolts not only need to provide reliable anchoring force but also require accurate positioning, verticality, and pre-set anchoring depth during installation to ensure uniform stress on the tower base and stability of the superstructure. With the expansion of transmission tower construction and the diversification of construction environments, higher requirements are placed on the installation precision and anti-loosening performance of anchor bolts.

[0003] Current technologies for anchor bolt assemblies in power transmission tower foundations typically employ an integral cast-in-place anchoring method. During construction, pre-embedded anchor bolts are connected to positioning steel plates, fixing frames, or templates via threaded ends to maintain their pre-defined geometric positions. The bolts are then fixed to the reinforcing cage or pre-embedded supports, and finally, concrete is poured to secure them within the foundation. This type of structure relies on the cast-in-place concrete to provide the primary anchoring force, while the threaded ends connect to the tower foot flanges to secure the tower body. Its structural design is mature and can meet the installation requirements of most conventional power transmission tower foundations.

[0004] However, in actual construction and under complex foundation conditions, traditional anchor bolts are usually fixed in the pre-set support position before pouring, and their anchoring depth and final posture cannot be adjusted after the concrete is poured. If there is deformation of the formwork, displacement of the reinforcing cage, or minor disturbances during the pouring process, the final position, verticality, or extension length of the bolts may deviate from the design value, thus affecting the stress uniformity and bearing capacity of the tower foundation to some extent.

[0005] Therefore, there is still room for further optimization in the existing structure, where the anchoring depth is difficult to adjust precisely according to the site conditions. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides an anti-loosening adjustable anchor bolt assembly for power transmission tower foundations, aiming to improve the problem that the anchoring depth in the existing anchor bolt structure is not adjustable, which makes it difficult to guarantee the final position and posture of the anchor bolt, thereby affecting the bearing capacity of the power transmission tower foundation.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an anti-loosening adjustable anchor bolt assembly for power transmission tower foundations, comprising an anchor bolt rod, a rectangular steel plate, and a multi-stage locking structure disposed on the anchor bolt rod; The outer wall of the anchor bolt rod is threaded with a first nut and a second nut from top to bottom; a first spring plate, a second spring plate, and a second washer are sequentially fitted on the outer wall of the anchor bolt rod below the second nut, and the first spring plate and the second spring plate are in contact with each other. The lower surface of the second washer is in contact with a rubber pad located on the upper surface of the rectangular steel plate. The rectangular steel plate has a threaded hole for threaded connection of the anchor bolt rod. The anchor bolt rod includes an upper part exposed on the foundation surface and a lower part anchored in the concrete. The lower part is threaded with a positioning adjustment nut, a first washer, a main locking nut, and an auxiliary anti-loosening nut, and the first washer is placed between the positioning adjustment nut and the main locking nut.

[0008] Furthermore, both the first and second spring plates are annular elastic elements, surrounding the outer wall of the anchor bolt rod, to provide elastic buffering and vibration absorption for the second nut.

[0009] Furthermore, the second gasket is a metal gasket, used to evenly transmit the pressure of the first spring sheet and the second spring sheet to the rubber pad.

[0010] Furthermore, the rubber pad is used to enhance the fit between the rectangular steel plate and the second pad, and to absorb micro-vibrations during the pouring and vibration process, thereby stabilizing the position of the rectangular steel plate.

[0011] Furthermore, the positioning adjustment nut is used to adjust the height position of the rectangular steel plate on the anchor bolt rod to achieve precise setting of the anchoring depth.

[0012] Furthermore, the main locking nut and the auxiliary anti-loosening nut are locked together by a reverse tightening method to eliminate thread clearance and improve vibration resistance and anti-loosening capability.

[0013] Furthermore, the first nut and the second nut are used to provide axial preload to the spring plate assembly located in the upper region of the foundation to prevent the rectangular steel plate from shaking during use.

[0014] Furthermore, the rectangular steel plate is made of low-alloy high-strength structural steel, and its central threaded hole is tightly fitted with the external thread of the anchor bolt rod to enhance the displacement resistance of the entire component during the concrete pouring process.

[0015] This utility model has the following beneficial effects: 1. In this utility model, the anchoring depth of the anchor bolt rod inside the concrete can be precisely adjusted by the three-nut adjusting and locking system consisting of the adjusting nut, the main locking nut, and the auxiliary anti-loosening nut, so that the L2 dimension can strictly correspond to the design value, which significantly improves the accuracy of pre-embedded positioning. Among them, the double-nut reverse locking structure formed between the main locking nut and the auxiliary anti-loosening nut can provide a strong axial clamping force, effectively resisting the impact and disturbance generated during concrete pouring and vibration, thereby ensuring that the anchor plate, i.e., the rectangular steel plate, remains stable during construction. Based on the synergistic effect of the above structures, the anchor bolt can accurately maintain the predetermined posture after final solidification, thereby improving the bearing capacity and overall safety and reliability of the power transmission tower foundation from the source.

[0016] 2. In this utility model, the anchor bolt rod, rectangular steel plate, three-nut adjusting and locking system, as well as spring plates, washers, and other components are all assembled as a whole through threaded connections, sleeve fits, and mechanical clamping. This eliminates the need for welding anchor plates in the existing anchor bolt pre-embedding process. Since the installation process only requires a regular wrench to complete the locking operations of the positioning adjusting nut, main locking nut, auxiliary anti-loosening nut, and the upper first and second nuts, the entire assembly process is unaffected by on-site environmental factors such as rain, snow, humidity, and wind. Compared with the traditional method that relies on welding, this solution simplifies the assembly steps, has high repeatability, and strong reliability. It significantly reduces the skill requirements for construction personnel, which can significantly shorten the construction cycle of the transmission tower foundation and improve the overall installation efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of an anti-loosening adjustable anchor bolt assembly for power transmission tower foundations proposed in this utility model. Figure 2 This is a schematic diagram of the rectangular steel plate portion of an anti-loosening adjustable anchor bolt assembly for power transmission tower foundations proposed in this utility model. Figure 3 This is a schematic diagram of the positioning and adjusting nut part of an anti-loosening adjustable anchor bolt assembly for power transmission tower foundations proposed in this utility model.

[0018] Legend: 1. Anchor bolt rod; 2. Threaded hole; 3. First nut; 4. Second nut; 5. Rectangular steel plate; 6. Positioning and adjusting nut; 7. First washer; 8. Main locking nut; 9. Auxiliary anti-loosening nut; 10. First spring plate; 11. Second spring plate; 12. Second washer; 13. Rubber pad. Detailed Implementation

[0019] Reference Figure 1 - Figure 3An embodiment of this utility model is provided: an anti-loosening adjustable anchor bolt assembly for power transmission tower foundation, including an anchor bolt rod 1, a rectangular steel plate 5, and a multi-level locking structure set on the anchor bolt rod 1; The outer wall of the anchor bolt rod 1 is threaded with a first nut 3 and a second nut 4 from top to bottom. The anchor bolt rod 1 serves as the main load-bearing component of the entire anti-loosening adjustable structure, penetrating the rectangular steel plate 5 and forming an anchoring connection with the foundation concrete. It also provides threaded installation positions for the upper adjusting nut and the lower locking nut. Below the second nut 4, the outer wall of the anchor bolt rod 1 is sequentially fitted with a first spring plate 10, a second spring plate 11, and a second washer 12. The first spring plate 10 and the second spring plate 11 are in close contact with each other. The first spring plate 10 and the second spring plate 11 also serve as part of a composite elastic buffer assembly, enhancing the upper structure's resistance to impact vibrations. The absorption capacity enhances the shock absorption and anti-loosening performance of the steel plate area. The lower surface of the second gasket 12 is in contact with the rubber gasket 13 located on the upper surface of the rectangular steel plate 5. The rectangular steel plate 5 has a threaded hole 2 for threaded connection of the anchor bolt rod 1. The anchor bolt rod 1 includes an upper part exposed on the foundation surface and a lower part anchored in the concrete. The outer wall of the lower part of the anchor bolt rod 1 is threaded with a positioning adjustment nut 6, a first gasket 7, a main locking nut 8, and an auxiliary anti-loosening nut 9. The first gasket 7 is located between the positioning adjustment nut 6 and the main locking nut 8. The main locking nut 8 and the auxiliary anti-loosening nut 9 work together to provide strong compression and stable anchoring effect.

[0020] Specifically, in this anchor bolt assembly, the anchor bolt rod 1 serves as the main load-bearing component, reliably transferring the tower base load to the concrete foundation and providing an installation carrier for the entire multi-stage anti-loosening structure; the rectangular steel plate 5 and threaded hole 2 are used to achieve anchoring and position and evenly distribute the tension to the foundation; the first nut 3 and the second nut 4 form the upper anti-loosening locking unit, ensuring the long-term stability of the tower foot connection; the first spring plate 10 and the second spring plate 11 constitute a composite elastic buffer structure, used to absorb vibration and improve the anti-loosening and shock absorption effect in the upper area; the second washer 12 and the rubber pad 13 together enhance the uniformity of force distribution and provide buffer compensation; the positioning adjustment nut 6 is used to adjust the anchoring depth; the first washer 7 is used to distribute the lower locking pressure; the main locking nut 8 provides anchor plate clamping force; and the auxiliary anti-loosening nut 9 further enhances the long-term anti-loosening stability of the lower locking system.

[0021] Reference Figure 1 - Figure 3The first spring plate 10 and the second spring plate 11 are both annular elastic elements, surrounding the outer wall of the anchor bolt rod 1, and are used to provide elastic buffering and vibration absorption for the second nut 4. The second washer 12 is a metal washer, used to evenly transmit the pressure of the first spring plate 10 and the second spring plate 11 to the rubber pad 13. The rubber pad 13 is used to enhance the fit between the rectangular steel plate 5 and the second washer 12, and to absorb the micro-vibrations during the pouring and vibration process, thereby stabilizing the position of the rectangular steel plate 5. The positioning adjustment nut 6 is used to adjust the position of the rectangular steel plate 5 on the anchor bolt rod 1. The height position is set to achieve precise setting of the anchoring depth. The main locking nut 8 and the auxiliary anti-loosening nut 9 are locked by reverse tightening to eliminate thread gaps and improve vibration resistance and anti-loosening ability. The first nut 3 and the second nut 4 are used to provide axial preload to the spring plate assembly located in the upper part of the foundation to prevent the rectangular steel plate 5 from shaking during use. The rectangular steel plate 5 is made of low alloy high strength structural steel. The threaded hole 2 in its center is tightly engaged with the external thread of the anchor bolt rod 1 to enhance the displacement resistance of the entire assembly during the concrete pouring process.

[0022] Specifically, the first spring plate 10 and the second spring plate 11, as annular elastic elements, provide elastic buffering and vibration absorption for the second nut 4; the second washer 12 is used to evenly transmit the pressure generated by the spring plate to the rubber pad 13 and improve the stress stability; the rubber pad 13 is used to enhance the fit between the rectangular steel plate 5 and the upper component and absorb the micro-vibrations generated by the pouring and vibration to stabilize the spatial position of the rectangular steel plate 5; the positioning adjustment nut 6 is used to adjust the height of the rectangular steel plate 5 on the anchor bolt rod 1 to ensure accurate anchoring depth; the main locking nut 8 and the auxiliary anti-loosening nut 9 are used to form the lower anti-loosening locking unit to improve the reliability of vibration resistance; the first nut 3 and the second nut 4 are used to provide axial preload to the upper spring plate assembly to prevent the rectangular steel plate 5 from shaking; the threaded hole 2 is used to achieve stable positioning of the anchor bolt rod 1, thereby improving the displacement resistance of the entire assembly during the concrete pouring process.

[0023] Working Principle: When the anti-loosening adjustable anchor bolt assembly for power transmission tower foundations is put into use, the entire structure is first connected to the pre-embedded position via the anchor bolt rod 1. The anchor bolt rod 1 consists of an upper part L1 exposed above the foundation surface and a lower part L2 fixed inside the concrete. The lower part of the anchor bolt rod 1 is threaded to a rectangular steel plate 5 through a threaded hole 2, allowing the rectangular steel plate 5 to be adjusted in height along the thread direction on the anchor bolt rod 1. Before construction, the position of the anchor bolt rod 1 relative to the rectangular steel plate 5 can be adjusted by rotating the positioning adjustment nut 6 located at the lower part of the anchor bolt rod 1, thereby achieving the rectangular... The fine adjustment of the depth of the steel plate 5 ensures that the bolt embedment length can accurately meet the designed L2 dimension. The first washer 7 is located between the positioning adjustment nut 6 and the main locking nut 8 to distribute the clamping force, prevent damage to the steel plate, and improve locking stability. Subsequently, the main locking nut 8 presses and fixes the rectangular steel plate 5 in the upward direction. The main locking nut 8 and the auxiliary anti-loosening nut 9 form a double nut anti-loosening structure at the lower end. The auxiliary anti-loosening nut 9 below it locks in the opposite direction to the main locking nut 8, so that the main locking nut 8 remains stable under long-term vibration conditions and will not loosen, thereby keeping the anchor plate position and the posture of the entire bolt fixed. At the upper part of the anchor bolt rod 1 exposed above the foundation surface, the first nut 3 and the second nut 4 are fixed to the outer wall of the bolt rod by threads to define the upper position of the elastic buffer assembly. The first spring plate 10 and the second spring plate 11 are sleeved below the second nut 4. The two are fitted together to form a composite elastic element to provide elastic absorption for possible vibrations in the upper part. The second washer 12 below the spring plate assembly evenly transmits the elastic force to the rubber pad 13. The rubber pad 13 is in contact with the upper surface of the rectangular steel plate 5. Through the flexible properties of the rubber material, it further absorbs construction disturbances and micro-vibrations, so that the rectangular steel plate 5 maintains a stable position during the pouring process. Throughout the construction process, the fine-tuning function achieved by the lower positioning adjustment nut 6 ensures that the length of the anchoring section is consistent with the design value; the double nut structure of the main locking nut 8 and the auxiliary anti-loosening nut 9 can keep the bolt axis stable during the pouring vibration, preventing the bolt from floating, tilting or twisting, and the first nut 3 and the second nut 4 at the upper end form a second anti-loosening lock, so that the bolt remains stable and reliable during tower foot installation and long-term operation.

Claims

1. An anti-loosening adjustable anchor bolt assembly for power transmission tower foundation, comprising an anchor bolt rod (1), a rectangular steel plate (5), and a multi-stage locking structure disposed on the anchor bolt rod (1); Its features are: The outer wall of the anchor bolt rod (1) is threaded with a first nut (3) and a second nut (4) from top to bottom; the outer wall of the anchor bolt rod (1) is fitted with a first spring plate (10), a second spring plate (11) and a second washer (12) in sequence below the second nut (4), and the first spring plate (10) and the second spring plate (11) are in contact with each other, and the lower surface of the second washer (12) is in contact with the rubber pad (13) located on the upper surface of the rectangular steel plate (5). The rectangular steel plate (5) has a threaded hole (2) for the anchor bolt rod (1) to be threaded. The anchor bolt rod (1) includes an upper part exposed on the foundation surface and a lower part anchored in the concrete. The lower part is threaded with a positioning adjustment nut (6), a first washer (7), a main locking nut (8) and an auxiliary anti-loosening nut (9), and the first washer (7) is set between the positioning adjustment nut (6) and the main locking nut (8).

2. The anti-loosening adjustable anchor bolt assembly for power transmission tower foundations according to claim 1, characterized in that: The first spring plate (10) and the second spring plate (11) are both annular elastic elements, which surround the outer wall of the anchor bolt rod (1) and are used to provide elastic buffering and vibration absorption for the second nut (4).

3. The anti-loosening adjustable anchor bolt assembly for power transmission tower foundations according to claim 1, characterized in that: The second gasket (12) is a metal gasket used to uniformly transmit the pressure of the first spring sheet (10) and the second spring sheet (11) to the rubber pad (13).

4. The anti-loosening adjustable anchor bolt assembly for power transmission tower foundations according to claim 1, characterized in that: The rubber pad (13) is used to enhance the fit between the rectangular steel plate (5) and the second pad (12) and to absorb the micro-vibrations during the pouring and tamping process, thereby stabilizing the position of the rectangular steel plate (5).

5. The anti-loosening adjustable anchor bolt assembly for power transmission tower foundations according to claim 1, characterized in that: The positioning adjustment nut (6) is used to adjust the height position of the rectangular steel plate (5) on the anchor bolt rod (1) so as to achieve precise setting of the anchoring depth.

6. The anti-loosening adjustable anchor bolt assembly for power transmission tower foundations according to claim 1, characterized in that: The main locking nut (8) and the auxiliary anti-loosening nut (9) are locked by a reverse tightening method to eliminate thread gaps and improve vibration resistance and anti-loosening ability.

7. The anti-loosening adjustable anchor bolt assembly for power transmission tower foundations according to claim 1, characterized in that: The first nut (3) and the second nut (4) are used to provide axial preload to the spring plate assembly located in the upper region of the base to prevent the rectangular steel plate (5) from shaking during use.

8. The anti-loosening adjustable anchor bolt assembly for power transmission tower foundations according to claim 1, characterized in that: The rectangular steel plate (5) is made of low alloy high strength structural steel. The threaded hole (2) in its center is closely matched with the external thread of the anchor bolt rod (1) to enhance the displacement resistance of the entire component during the concrete pouring process.

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