A column anchor connecting structure

Abstract

The utility model relates to the field of building, concretely relates to a column foot anchor bolt connecting structure, including a plurality of anchor bolts, anchor bolt includes pre -buried section and screw section, the pre -buried section of anchor bolt is pre -buried in the foundation, and the screw section of anchor bolt exposes foundation surface, and the anchor bolt is screw -threaded with installation adjusting nut and gasket, and the gasket is located the upper installation adjusting nut, and the anchor bolt is provided with steel column bottom plate, and the gasket is located the steel column bottom plate below, and the steel column bottom plate is pressed to have the pressing plate, and the pressing plate top is provided with lock nut, and the lock nut is screw -threaded on the anchor bolt, and the foundation is provided with the anti -shear key hole, and the anti -shear key is installed in the anti -shear key hole, and the anti -shear key is fixedly connected with the steel column bottom plate, and the foundation and steel column bottom plate between cast have secondary cast layer, and the secondary cast layer covers installation adjusting nut, gasket and anti -shear key. The scheme can solve the problem that the traditional rigid column foot structure is poor in shearing capacity.

Description

Technical Field

[0001] This utility model relates to the field of buildings, specifically to a column base anchor bolt connection structure. Background Technology

[0002] In steel structure buildings, the column base, as a key node connecting the steel column and the foundation, directly affects the safety and stability of the entire structure. The steel column base needs to simultaneously transmit multiple forces, including vertical loads, horizontal shear forces, and torques. Among these, the effective transmission of horizontal shear forces is the core of ensuring the structure's resistance to lateral displacement. If shear force transmission fails, it can easily lead to shear failure of the column base, resulting in overall structural instability. Traditional steel column base structures often rely on the shear resistance of the anchor bolts themselves or the friction between the steel column base plate and the foundation concrete to transfer horizontal shear force. However, the primary function of anchor bolts is to withstand tensile forces, and their shear resistance is relatively weak. Under horizontal forces, they are prone to bending deformation or localized crushing at the contact surface with the concrete. Furthermore, relying solely on the friction between the steel column base plate and the foundation concrete for shear resistance is susceptible to factors such as the flatness of the foundation surface and the bolt preload, resulting in low shear force transfer efficiency. Under repeated loading (such as earthquakes), the shear resistance is also prone to decrease due to the attenuation of the friction coefficient. Utility Model Content

[0003] The present invention aims to provide a column base anchor bolt connection structure to solve the problem of poor shear resistance of traditional rigid column base structures.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A column base anchor bolt connection structure includes multiple anchor bolts, each anchor bolt comprising an embedded section and a threaded section. The embedded section of the anchor bolt is embedded within the foundation, while the threaded section protrudes from the foundation surface. An adjusting nut and a washer are threaded onto the anchor bolt, with the washer positioned above the adjusting nut. A steel column base plate passes through the anchor bolt, with the washer positioned below the steel column base plate. A pressure plate is pressed onto the steel column base plate, and a locking nut is positioned above the pressure plate. The locking nut is threaded onto the anchor bolt. A shear key cavity is provided in the foundation, and a shear key is installed within the cavity, fixedly connected to the steel column base plate. A secondary grouting layer is poured between the foundation and the steel column base plate, covering the adjusting nut, washer, and shear key.

[0005] Preferably, as an improvement, a locking nut is provided above the locking nut, and the locking nut is threaded onto the anchor bolt.

[0006] Preferably, as an improvement, the free end of the pre-embedded section of the anchor bolt is provided with a bend, the bend being perpendicular to the pre-embedded section, and the free end of the bend facing inward toward the foundation.

[0007] Preferably, as an improvement, the ratio of the diameter of the anchor bolt to the length of the bend is 1:4.

[0008] Preferably, as an improvement, the cross-section of the shear key opening is rectangular.

[0009] Preferably, as an improvement, the axis of the shear key opening is vertically aligned with the center of the steel column base plate.

[0010] Preferably, as an improvement, the thickness of the secondary grouting layer is 70mm.

[0011] Preferably, as an improvement, the shear key surface is provided with an anti-slip structure.

[0012] Preferably, as an improvement, the anti-slip structure is an anti-slip texture or a threaded anti-slip rib.

[0013] Preferably, as an improvement, the shear key has a horizontal through hole.

[0014] The beneficial effects of this plan are: 1. Anchor bolts are reliably anchored to the foundation via pre-embedded sections. The threaded sections, along with adjusting nuts and washers, allow for precise adjustment of the steel column base plate elevation and horizontal position, meeting construction accuracy requirements. Pressure plates and locking nuts further tighten the steel column base plate, forming a stable force transmission path. This effectively transfers the vertical and horizontal loads of the steel column to the foundation, ensuring the rigidity and load-bearing capacity of the column base connection. This results in precise positioning and stable stress distribution of the steel column after installation, providing reliable support for the superstructure.

[0015] 2. An anti-loosening nut is added above the locking nut to form a double anti-loosening mechanism. This can effectively suppress the risk of loosening of the anchor bolt thread connection due to vibration, load fluctuation, etc., avoid loosening of the column foot connection node, and maintain long-term stable force transmission performance.

[0016] 3. The anchor bolt's embedded section features a bend perpendicular to the embedded section, increasing the contact area and mechanical interlocking force between the anchor bolt and the foundation concrete, significantly improving the anchor bolt's pull-out and shear resistance. This makes it more difficult for the anchor bolt to be pulled out of the foundation or slip when subjected to tensile and shear forces transmitted from the steel column, enhancing the reliability of the column base anchorage. The anchor bolt diameter and bend length are matched in a 1:4 ratio, maximizing the anchoring advantage of the bend while ensuring the anchor bolt's own strength, thus balancing material usage and anchoring effect.

[0017] 4. The shear key opening adopts a rectangular cross-section, and its regular shape facilitates construction and shear key installation, providing a stable space for the shear key. The axis of the shear key opening is vertically aligned with the center of the steel column base plate, ensuring that the shear key is precisely aligned with the stress center of the steel column, making the horizontal shear force transmission more direct and uniform.

[0018] 5. A 70mm thick secondary grouting layer covers and installs adjusting nuts, washers, and shear keys. This serves two purposes: firstly, it fills the gap between the steel column base plate and the foundation, creating a unified load-bearing system and optimizing load transfer paths, allowing vertical pressure and horizontal shear force to be more evenly distributed to the foundation. Secondly, covering critical components effectively protects them, reducing the intrusion of moisture and corrosive media, delaying corrosion and aging, and improving the durability of the column base. Simultaneously, the strength of the secondary grouting layer itself assists the anchor bolts and shear keys in bearing load, enhancing the overall mechanical performance of the column base.

[0019] 6. The shear key surface is equipped with anti-slip textures or threaded anti-slip ribs, which increases the contact friction and mechanical interlocking force with the secondary grouting layer, preventing relative slippage between the shear key and the grouting layer and improving shear force transmission efficiency. In addition, horizontal through holes are provided on the shear key, allowing the secondary grouting layer material to fill them, forming a "pin" structure. This further strengthens the connection between the shear key and the grouting layer, making it more difficult for the shear key to shift under horizontal shear force.

[0020] In summary, this scheme significantly improves shear bearing capacity compared to traditional structures through a clear shear force transfer path, the synergistic effect of reinforced shear keys and grouting layers, and optimized anchoring and anti-loosening design. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of an embodiment of the present utility model.

[0022] Figure 2 This is a schematic diagram of the anchor bolt in an embodiment of the present invention.

[0023] The reference numerals in the accompanying drawings include: 1. Anchor bolt; 2. Installation and adjustment nut; 3. Washer; 4. Pressure plate; 5. Locking nut; 6. Anti-reverse nut; 7. Steel column base plate; 9. Shear key hole; 10. Shear key; 11. Secondary grouting layer; 12. Foundation; 14. Threaded section; 15. Embedded section; 16. Bending part. Detailed Implementation

[0024] The following detailed description illustrates the specific implementation methods: Example 1 like Figure 1 and Figure 2As shown, a column base anchor bolt connection structure includes multiple anchor bolts 1. Each anchor bolt 1 includes an embedded section 15 and a threaded section 14. The embedded section 15 is embedded in the foundation 12, and the threaded section 14 protrudes from the surface of the foundation 12. The free end of the embedded section 15 of the anchor bolt 1 has a bent portion 16, which is perpendicular to the embedded section 15 and faces inward towards the foundation 12. The ratio of the diameter of the anchor bolt 1 to the length of the bent portion 16 is 1:4. An adjusting nut 2 and a washer 3 are threadedly connected to the threaded section 14 of the anchor bolt 1. The washer 3 is located above the adjusting nut 2. A steel column base plate 7 passes through the anchor bolt 1, and the washer 3 is located below the steel column base plate 7. A pressure plate 4 is pressed on the steel column base plate 7, and a locking nut 5 is installed above the pressure plate 4. The locking nut 5 is threadedly connected to the anchor bolt 1. A stop nut 6 is provided above the locking nut 5 and threadedly connected to the anchor bolt 1.

[0025] A shear key opening 9 is pre-reserved in the foundation 12. The cross-section of the shear key opening 9 is rectangular, and its axis is vertically aligned with the center of the steel column base plate 7. A shear key 10, made of I-beam, is installed inside the shear key opening 9 and welded to the steel column base plate 7. A secondary grouting layer 11 is poured between the foundation 12 and the steel column base plate 7. The secondary grouting layer 11 covers and installs the adjusting nut 2, washer 3, and shear key 10. The thickness of the secondary grouting layer 11 is 70mm.

[0026] During construction, anchor bolts 1 with bent sections 16 are precisely pre-embedded during the foundation 12 construction stage, and rectangular shear key holes 9 are reserved in the foundation 12. Next, the threaded sections 14 of the anchor bolts 1 are cleaned, and adjusting nuts 2 and washers 3 are installed and leveled sequentially on the threaded sections 14. Then, the prefabricated steel column base plate 7, welded to the shear key 10, is hoisted into place, allowing the shear key 10 to insert into the shear key hole 9. The elevation and verticality of the steel column are finely adjusted by installing adjusting nuts 2. After achieving the required standards, pressure plates 4 are installed, and locking nuts 5 and anti-reverse nuts 6 are tightened sequentially. Finally, formwork is erected, and micro-expansion fine aggregate concrete is poured as the secondary grouting layer 11 and cured. This scheme, through the coordinated operation of multiple components, can significantly improve the shear resistance and anchoring performance of the column base, ensuring the stability and reliability of the column base.

[0027] Example 2 The difference between this embodiment and Embodiment 1 is that the surface of the shear key 10 is provided with an anti-slip structure. The anti-slip structure is either a directly machined anti-slip texture or a threaded anti-slip rib welded to the surface of the shear key 10. By providing the anti-slip structure, the interlocking force between the shear key 10 and the secondary grouting layer 11 can be enhanced, preventing relative slippage between the shear key 10 and the grouting layer, and improving the shear force transmission efficiency.

[0028] Example 3 The difference between this embodiment and Embodiment 1 is that multiple through holes are horizontally formed on the shear key 10. In this embodiment, multiple through holes are horizontally formed on the shear key 10, and the material of the secondary grouting layer 11 can fill the through holes to form a structure similar to a "pin", which can further strengthen the connection between the shear key 10 and the grouting layer.

[0029] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A column anchor connection structure, characterized by: The system includes multiple anchor bolts, each consisting of an embedded section and a threaded section. The embedded section is embedded within the foundation, while the threaded section protrudes from the foundation surface. An adjusting nut and a washer are threaded onto the anchor bolt, with the washer positioned above the adjusting nut. A steel column base plate passes through the anchor bolt, with the washer positioned below the base plate. A pressure plate presses onto the base plate, and a locking nut is positioned above the pressure plate, threaded onto the anchor bolt. A shear key cavity is provided in the foundation, and a shear key is installed within the cavity, securing it to the steel column base plate. A secondary grouting layer is poured between the foundation and the steel column base plate, covering the adjusting nut, washer, and shear key. The ratio of the anchor bolt diameter to the length of the bent portion is 1:

4. The shear key surface has an anti-slip structure. A horizontal through hole is provided on the shear key.

2. A column anchor connection structure according to claim 1, wherein: A locking nut is provided above the locking nut, and the locking nut is threaded onto the anchor bolt.

3. A column anchor connection according to claim 2, wherein: The anchor bolt has a bent section at its free end, which is perpendicular to the embedded section and faces inward toward the foundation.

4. A column anchor connection according to claim 3, wherein: The cross-section of the hole for the shear key is rectangular.

5. The column base anchor bolt connection structure according to claim 4, characterized in that: The axis of the shear key opening is vertically aligned with the center of the steel column base plate.

6. A column anchor connection according to claim 5, wherein: The thickness of the secondary grouting layer is 70mm.

7. A column anchor connection according to claim 6, wherein: The anti-slip structure consists of anti-slip patterns or spiral anti-slip ribs.

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