Anchored footing mounting device and anchored footing assembly with protective sleeve

Abstract

The utility model relates to steel structure column foot anchor bolt construction technical field discloses a kind of anchor bolt type column foot mounting device and anchor bolt assembly with protective sleeve, anchor bolt type column foot mounting device includes: sleeve, with anchor bolt one-to-one corresponding cooperation, the diameter of sleeve is greater than anchor bolt diameter and less than anchor bolt nut diameter;Anchor bolt includes threaded portion, sleeve length covers threaded portion and extends along the direction away from anchor bolt and forms guide portion.Sleeve with diameter greater than anchor bolt stem but less than nut is set, the threaded portion of anchor bolt can be completely wrapped, effectively avoid the mechanical collision of bottom plate hole wall and threaded segment when column bottom plate falls, prevent plastic deformation even local defect of thread tooth shape, ensure that nut is smoothly installed in later period.Simultaneously, the guide portion formed by sleeve extension can guide anchor bolt to accurately pass through anchor bolt hole of column bottom plate when column foot is installed, reduce artificial adjustment time, improve construction efficiency, and reduce the thread abrasion risk caused by repeated alignment.

Description

Technical Field

[0001] This utility model relates to the field of steel structure column base anchor bolt construction technology, specifically to an anchor bolt type column base installation device and an anchor bolt assembly with a protective sleeve. Background Technology

[0002] Anchored column bases are a widely used column base connection method in steel structure engineering. The design typically requires at least six anchors, which, along with precision-machined threaded anchors, matching nuts, and the column base plate, form a fixed connection system. During construction, the anchors must first be precisely embedded and positioned in the concrete foundation. After the concrete is poured, the pre-drilled steel column base plate is aligned with the anchor positions and vertically inserted. Finally, the nuts are tightened to secure the steel column.

[0003] In related technologies, because anchor bolts have threaded sections at the top for nut tightening, and the clearance between the anchor bolt and the hole in the column base plate is limited, mechanical collisions between the hole wall and the threaded section are highly likely during the descent of the column base plate. Such collisions can cause plastic deformation or even localized damage to the thread profile. This can range from minor issues like difficulty screwing in the nut requiring manual thread repair to severe problems like anchor bolt failure necessitating re-installation of reinforcement bars. This not only significantly increases installation and adjustment time but also reduces the efficiency of the tower crane due to repeated lifting and adjustments. Furthermore, thread damage can affect the uniformity of the tightening preload, potentially compromising the load-bearing capacity of the connection joint. Utility Model Content

[0004] In view of this, the present invention provides an anchor bolt type column base installation device and an anchor bolt assembly with a protective sleeve to solve the problem of easy damage to the threads when connecting the column base plate and the anchor bolt.

[0005] This utility model provides an anchor bolt type column base installation device, including:

[0006] The sleeve is matched one-to-one with the anchor bolt. The diameter of the sleeve is larger than the diameter of the anchor bolt but smaller than the diameter of the anchor bolt nut.

[0007] The anchor bolt includes a threaded portion, and the sleeve length covers the threaded portion and extends in a direction away from the anchor bolt to form a guide portion.

[0008] Beneficial effects: By using a sleeve with a diameter larger than the anchor bolt shaft but smaller than the nut, the threaded portion of the anchor bolt can be completely enclosed. This effectively prevents mechanical collision between the base plate hole wall and the threaded section when the column base plate is lowered, preventing plastic deformation or even local damage to the thread profile and ensuring smooth installation of the nut later. Simultaneously, the guide portion formed by the extended sleeve can guide the anchor bolt accurately through the anchor bolt hole in the column base plate during column foot installation, reducing manual adjustment time, improving construction efficiency, and lowering the risk of thread wear caused by repeated alignment.

[0009] In one alternative implementation, the end of the guide portion away from the anchor bolt is chamfered.

[0010] Beneficial effects: The chamfer at the end of the guide section can reduce the frictional resistance when the sleeve is inserted into the anchor bolt hole of the column base plate, making the installation process smoother and avoiding the anchor bolt from shifting due to excessive resistance, thereby damaging the thread and further improving construction quality and efficiency.

[0011] In one alternative embodiment, the sleeve length extends beyond the threaded portion by a predetermined length range, the predetermined length range being 250mm-350mm.

[0012] Beneficial effects: By setting the sleeve length to be 250-350mm longer than the thread, it ensures that the sleeve completely covers the entire threaded section, preventing any section of the thread from being exposed to the outside space, while also providing sufficient guide length to correct for installation deviations that may occur during construction. This preset length range is optimized to avoid wasting materials or affecting operation due to excessive length, and to avoid reducing the protective or guiding effect due to excessive shortness.

[0013] In one alternative implementation, the sleeve is made of a rigid material.

[0014] Beneficial effects: The rigid material used in the sleeve effectively resists lateral pressure during installation misalignment, preventing deformation of the sleeve and subsequent thread jamming. The rigid material also ensures the sleeve maintains its shape stability after multiple uses, extending its service life and reducing replacement frequency and construction costs.

[0015] In one alternative implementation, the inner wall of the sleeve is polished.

[0016] Beneficial effects: Polishing the inner wall of the casing significantly improves surface smoothness, reducing the friction coefficient with the anchor bolt threads. This makes it easier for the anchor bolt to rotate and be installed within the casing, preventing disassembly difficulties caused by threads jamming against the casing's inner wall. Polishing also prevents rust and scale buildup on the inner wall of the casing, maintaining smooth performance over the long term.

[0017] Secondly, this utility model also provides an anchor bolt assembly with a protective sleeve, including the aforementioned anchor bolt type column foot mounting device sleeved on the threaded portion, and further including that the bottom of the sleeve abuts against the stepped surface at the root of the threaded portion.

[0018] Beneficial effects: By abutting the bottom of the casing against the stepped surface at the root of the thread, the axial displacement of the casing can be restricted, ensuring that the casing always fully covers the threaded section that needs protection. This avoids the problem of thread exposure caused by casing displacement and improves the reliability and consistency of construction.

[0019] In one alternative embodiment, the column base plate is provided with multiple anchor bolt holes, which are fitted with anchor bolts for installation.

[0020] Beneficial effects: Pre-drilling multiple anchor bolt holes on the column base plate to match the anchor bolts enables simultaneous positioning and installation of multiple anchor bolts, improving assembly efficiency. The matching design of the anchor bolt holes and sleeves ensures accurate alignment of each anchor bolt, reducing on-site adjustment time and improving the overall structural stability.

[0021] In one alternative implementation, the outer diameter of the sleeve is smaller than the diameter of the anchor bolt hole.

[0022] Beneficial effects: The outer diameter of the sleeve is smaller than the diameter of the anchor bolt hole, which can avoid interference between the sleeve and the anchor bolt hole caused by processing errors or installation deviations, and ensure that the sleeve is inserted smoothly.

[0023] In one alternative embodiment, the anchor bolt is provided with a double nut and a leveling nut, the leveling nut being located on the side of the double nut away from the threaded portion.

[0024] Beneficial effects: The double nuts securely lock the anchor bolts, ensuring the long-term stability of the structure. The leveling nuts facilitate fine-tuning of the column base plate's levelness during installation, eliminating installation errors.

[0025] In one alternative implementation, the top of the sleeve extends above the column base plate.

[0026] Beneficial effect: Depending on the installation direction of the column base plate, the top of the sleeve extends above the column base plate, which can guide the connection when the column base plate is aligned with the anchor bolt, and prevent the thread profile from being damaged. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the anchor bolt type column base installation device and the anchor bolt of this utility model.

[0029] Figure 2 This is a schematic diagram of an anchor bolt;

[0030] Figure 3 This is a schematic diagram of the anchor bolt type column base installation device of this utility model after being installed with the anchor bolt;

[0031] Figure 4 This is a schematic diagram showing the connection between the anchor bolt and the column base plate of this utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Sleeve; 11. Guide section; 12. Chamfer; 2. Anchor bolt; 21. Threaded section; 22. Body section; 3. Column base plate. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] Anchored column bases are a common rigid connection method in steel structure engineering, and their design must meet strict structural requirements. Typically, at least six precision-machined threaded anchors (2) are used, along with high-strength nuts and a column base plate of calculated thickness, to form a stable fixed connection system. Construction must be completed in stages: First, before pouring the concrete foundation, the anchor group is precisely pre-embedded using a dedicated positioning bracket, ensuring that its planar position, elevation, and verticality meet design requirements; after the concrete reaches strength, the pre-drilled steel column base plate (3) is hoisted to the anchor (2) position, and initial positioning is achieved through alignment between the holes and the anchor (2); finally, the steel column is fixed by tightening the nuts. In this process, the threaded section of the anchor (2) is a key part for force transmission, and its machining accuracy and integrity directly affect the mechanical properties of the joint.

[0039] In actual construction, the design gap between the hole in the column base plate 3 and the anchor bolt 2 is usually only 2-3mm, while the threaded section at the top of the anchor bolt 2 has obvious tooth protrusions. Even slight misalignment during steel column hoisting can easily cause mechanical collision between the hole wall and the threaded teeth. This collision can cause plastic deformation of the threaded teeth, forming barbs, leading to increased frictional resistance or even jamming when the nut is screwed in; or local thread breakage and damage, resulting in a reduction in the effective load-bearing section. This reduces construction efficiency, requiring work stoppage to repair the threads or replace the anchor bolt 2. Furthermore, thread damage can lead to uneven preload on each group of anchor bolts 2, causing stress concentration at the column base joint under long-term loads, affecting the overall reliability of the structure.

[0040] The following is combined with Figures 1 to 4 The following describes embodiments of the present invention.

[0041] According to an embodiment of the present invention, an anchor bolt type column base installation device is provided, comprising: a sleeve 1, which corresponds to and cooperates with an anchor bolt 2, wherein the diameter of the sleeve 1 is larger than the diameter of the anchor bolt 2 and smaller than the diameter of the nut of the anchor bolt 2; the anchor bolt 2 includes a threaded portion 21, and the sleeve 1 extends in a direction away from the anchor bolt 2 to form a guide portion 11.

[0042] By using a sleeve 1 with a diameter larger than the anchor bolt 2 shaft but smaller than the nut, the threaded portion 21 of the anchor bolt 2 can be completely enclosed. This effectively prevents mechanical collision between the base plate hole wall and the threaded section when the column base plate 3 is lowered, preventing plastic deformation or even local damage to the thread profile and ensuring smooth installation of the nut later. Simultaneously, the guide portion 11 formed by the extension of the sleeve 1 guides the anchor bolt 2 to accurately pass through the anchor bolt hole of the column base plate 3 during column foot installation, reducing manual adjustment time, improving construction efficiency, and lowering the risk of thread wear caused by repeated alignment.

[0043] As one feasible form, the guide part 11 can be a conical sleeve. The conical surface expands the range of guiding angles, adapting to the sleeve requirements of anchor bolt holes with different inclination angles and reducing installation difficulty. The cone angle is controlled within the range of 15°-20°, which can maximize the fault tolerance while ensuring guiding accuracy.

[0044] Optionally, the sleeve 1 is made of a rigid material. A rigid sleeve 1 can effectively resist lateral pressure during installation misalignment, preventing deformation of the sleeve 1 that could cause the threaded portion 21 to jam. The rigid material also ensures that the sleeve 1 maintains its shape stability after multiple uses, extending its service life and reducing replacement frequency and construction costs.

[0045] In terms of material selection, sleeve 1 is made of high-strength Q235 steel through precision cold rolling, with a yield strength exceeding 235MPa, capable of withstanding various mechanical stresses during construction. To further enhance performance, sleeve 1 undergoes a tempering heat treatment process, ensuring both sufficient rigidity and appropriate toughness. The inner surface of sleeve 1 is mirror-polished using a CNC machine tool, with a surface roughness controlled below Ra0.8. This ultra-precision machining process ensures that the anchor bolt 2 moves smoothly within sleeve 1 without damaging the threads.

[0046] It is worth noting that the inner wall of sleeve 1 is polished. Polishing significantly improves the surface smoothness of the inner wall of sleeve 1, reducing the coefficient of friction with the threads of anchor bolt 2. This makes it easier for anchor bolt 2 to rotate and be fitted inside sleeve 1, avoiding disassembly difficulties caused by the threads jamming against the inner wall of sleeve 1. Polishing also prevents rust or scale buildup on the inner wall of sleeve 1, maintaining smooth performance over the long term.

[0047] Furthermore, combined Figure 1 As shown, the end of the guide portion 11 furthest from the anchor bolt 2 has a chamfer 12. The chamfer 12 at the end of the guide portion 11 reduces the frictional resistance when the sleeve 1 is inserted into the anchor bolt hole of the column base plate 3, making the installation process smoother and preventing the anchor bolt 2 from shifting due to excessive resistance, thus damaging the threads and further improving construction quality and efficiency. The chamfer 12 is 2-3 mm wide, which significantly reduces insertion resistance. More notably, the inner wall of the guide portion 11 has a spiral guide groove structure, which is aligned with the thread direction of the anchor bolt 2, automatically correcting the rotation angle of the anchor bolt 2 during the guiding process.

[0048] In some embodiments, combined with Figure 1As shown, the length of the sleeve 1 extends beyond the length of the threaded portion 21 by a predetermined length range, which is 250mm-350mm. By setting the length of the sleeve 1 to be 250-350mm longer than the threaded portion 21, it is ensured that the sleeve 1 completely covers the entire threaded portion 21, preventing any section of the thread from being exposed to the outside space, while also providing sufficient guiding length to correct for installation deviations that may occur during construction. This predetermined length range is optimized so that it is neither too long, which would waste materials or affect operation, nor too short, which would reduce the protective or guiding effect.

[0049] According to an embodiment of the present invention, another aspect is provided: an anchor bolt 2 assembly with a protective sleeve, including the aforementioned anchor bolt type column foot mounting device sleeved on the threaded portion 21, and further including that the bottom of the sleeve 1 abuts against the stepped surface at the root of the threaded portion 21.

[0050] By abutting the bottom of the sleeve 1 against the stepped surface at the root of the threaded portion 21, the axial displacement of the sleeve 1 can be restricted, ensuring that the sleeve 1 always fully covers the threaded section that needs protection. This avoids the problem of thread exposure caused by the displacement of the sleeve 1, and improves the reliability and consistency of construction.

[0051] In some embodiments, combined with Figure 2 and Figure 3 As shown, the column base plate 3 is provided with multiple anchor bolt holes, which are fitted with anchor bolts 2 for installation. The pre-set anchor bolt holes on the column base plate 3, matching the anchor bolts 2, enable simultaneous positioning and installation of multiple anchor bolts 2, improving assembly efficiency. The design of the anchor bolt holes and sleeve 1 ensures accurate alignment of each anchor bolt 2, reducing on-site adjustment time and improving the overall structural stability.

[0052] Furthermore, the top of the sleeve 1 extends above the column base plate 3. Depending on the installation direction of the column base plate 3, the extension of the top of the sleeve 1 above the column base plate 3 can guide the connection when the column base plate 3 is aligned with the anchor bolt 2, preventing damage to the thread profile.

[0053] In some embodiments, combined with Figure 3 and Figure 4 As shown, the outer diameter of sleeve 1 is smaller than the diameter of the anchor bolt hole. This smaller outer diameter avoids interference between sleeve 1 and the anchor bolt hole caused by machining errors or installation deviations, ensuring smooth insertion of sleeve 1.

[0054] In some embodiments, the anchor bolt 2 is provided with a double nut and a leveling nut, with the leveling nut located on the side of the double nut away from the threaded portion 21. The double nut securely locks the anchor bolt 2, ensuring the long-term stability of the structure. The leveling nut facilitates fine-tuning of the levelness of the column base plate 3 during installation, eliminating installation errors.

[0055] The sleeve 1 can also be treated with anti-corrosion measures. The outer surface of the sleeve 1 is first sandblasted and then hot-dip galvanized; the inner surface is treated with a special anti-rust oil seal. This differentiated anti-corrosion solution not only meets the anti-corrosion requirements of the external environment, but also ensures the lubrication performance of the internal threads.

[0056] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. An anchor bolt type column base installation device, characterized in that, include: The sleeve (1) is matched with the anchor bolt (2) in a one-to-one correspondence. The diameter of the sleeve (1) is larger than the diameter of the anchor bolt (2) and smaller than the diameter of the nut of the anchor bolt (2). The anchor bolt (2) includes a threaded portion (21), and the sleeve (1) extends in length covering the threaded portion (21) and extends in a direction away from the anchor bolt (2) to form a guide portion (11).

2. The anchor bolt type column base installation device according to claim 1, characterized in that, The guide portion (11) has a chamfer (12) at the end away from the anchor bolt (2).

3. The anchor bolt type column base installation device according to claim 1, characterized in that, The length of the sleeve (1) extends by a predetermined length range compared to the length of the threaded portion (21), and the predetermined length range is 250mm-350mm.

4. The anchor bolt type column base installation device according to claim 3, characterized in that, The sleeve (1) is made of a rigid material.

5. The anchor bolt type column base installation device according to claim 4, characterized in that, The inner wall of the sleeve (1) is polished.

6. An anchor bolt assembly with a protective sleeve, characterized in that, The anchor bolt type column base mounting device according to any one of claims 1-5, which is sleeved on the threaded portion (21), further includes that the bottom of the sleeve (1) abuts against the root step surface of the threaded portion (21).

7. The anchor bolt assembly with protective sleeve according to claim 6, characterized in that, Includes a column base plate (3), which is provided with multiple anchor bolt holes, which are installed in conjunction with the anchor bolts (2).

8. The anchor bolt assembly with protective sleeve according to claim 7, characterized in that, The outer diameter of the sleeve (1) is smaller than the diameter of the anchor bolt hole.

9. The anchor bolt assembly with protective sleeve according to claim 8, characterized in that, The anchor bolt (2) is provided with a double nut and a leveling nut, the leveling nut being located on the side of the double nut away from the threaded portion (21).

10. The anchor bolt assembly with protective sleeve according to claim 8, characterized in that, The top of the sleeve (1) extends above the column base plate (3).

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