End anchor plate type anchor rod device for precisely-rolled twisted steel for super-large raft

Abstract

The utility model belongs to the technical field of anchor rod devices, and particularly relates to a precisely-rolled twisted steel end anchor plate type anchor rod device for an oversized raft, which comprises an anchor rod main body, an anchor head end anchor plate arranged at the top end of the anchor rod main body, and an anchor tail end anchor plate arranged at the bottom end of the anchor rod main body. Fixing nuts are arranged on the two sides of the anchor head end anchor plate and the two sides of the anchor tail end anchor plate, the anchor rod body is of a single finish-rolled threaded steel bar structure, the diameter of the steel bar is 40 mm, and the fixing nuts arranged on the two sides of the anchor head end anchor plate and the two sides of the anchor tail end anchor plate can improve the rigidity, so that the anchor rod device can be suitable for a deep foundation pit with a thick and large bottom plate, the integrity is improved, and the service life of the anchor rod device is prolonged. And the internal force and deformation of the bottom plate raft are reduced, the efficient, stable and reliable anchoring effect is achieved, and a powerful guarantee is provided for the stability and safety of the oversized raft structure.

Description

Technical Field

[0001] This utility model belongs to the technical field of anchor bolt devices, specifically relating to an anchor bolt device for the end of finely threaded steel bars used in ultra-large raft foundations. Background Technology

[0002] With the increasing area of ​​building basements, buoyancy often causes localized bulging and cracking of the basement raft slab, resulting in building uplift and even cracking of the piles. Traditional basement surcharge or anti-buoyancy design methods involve spot welding four 25m diameter hot-rolled ribbed steel bars onto 32mm diameter steel pipes, grouting through a grouting pipe placed in the center of the pipes, and anchoring the bars into the bottom slab section at a 90-degree bend according to the basic anchorage length of the hot-rolled ribbed steel bars, with the included angle between the four anchor bars being 90 degrees. Existing pull-out anchors, made of steel strands or ordinary steel bars, welded or bent, have relatively low stiffness, which is limiting for deep foundation pits with large slab areas, numerous pull-out anchors, and large rock penetration. The overall structural requirements are high, and the operation is difficult. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a precision-rolled threaded steel bar end-anchor plate type anchor bolt device for ultra-large raft foundations. The anchor bolt body uses precision-rolled threaded steel bars, with a single bar structure and a steel bar diameter of 40mm. The anchor plates at the anchor head end and the anchor tail end are equipped with fixing nuts on both sides, which can improve rigidity. This allows the anchor bolt device to be applied to deep foundation pits with thick and large bottom slabs, improving overall integrity, reducing the internal forces and deformation of the bottom slab and raft foundation. It solves the problems of existing pull-out anchor bolts, which are made of steel strands or ordinary steel bars, welded or bent, and have low rigidity. These anchor bolts are limited for deep foundation pits with large slab areas, a large number of pull-out anchor bolts, and large rock penetration of anchor bolts, and the overall structural requirements and operational difficulties are high.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: an anchor bolt device for the end anchor plate of finely threaded steel bars for ultra-large raft foundations, comprising an anchor bolt body, an anchor head end anchor plate provided at the top of the anchor bolt body, an anchor tail end anchor plate provided at the bottom of the anchor bolt body, and fixing nuts provided on both sides of the anchor head end anchor plate and the anchor tail end anchor plate.

[0005] Preferably, the anchor plate at the anchor head end is a square steel plate structure, and two fixing nuts are provided on each side of the anchor plate at the anchor head end.

[0006] Preferably, the fixing nut disposed on the side of the anchor plate at the anchor head end near the top of the anchor rod body has at least 3 loose threads between it and the top of the anchor rod body.

[0007] Preferably, the anchor plate at the anchor head end is provided with a grouting hole for pouring concrete.

[0008] Preferably, the anchor plate at the tail end is a circular steel plate structure, and the anchor plate at the tail end is provided with reserved holes for secondary grouting.

[0009] Preferably, the overall height of the fixing nut is 100 mm.

[0010] Preferably, the anchor rod body is made of prestressed threaded steel bar with a diameter of 40 mm.

[0011] Preferably, a number of tie rods are welded to the upper end of the anchor bolt body.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: The utility model proposes a precision-rolled threaded steel bar end anchor plate type anchor rod device for ultra-large raft foundations. The anchor rod body adopts precision-rolled threaded steel bars, with a single bar structure and a steel bar diameter of 40mm. The anchor plates at the anchor head end and the anchor plates at the anchor tail end are equipped with fixing nuts on both sides, which can improve rigidity and make the anchor rod device applicable to deep foundation pits with thick and large bottom plates. It improves the overall integrity, reduces the internal force and deformation of the bottom plate and raft foundation, and achieves efficient, stable and reliable anchoring effect, providing a strong guarantee for the stability and safety of ultra-large raft foundation structures.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of an end anchor plate type anchor bolt device for ultra-large raft foundations using finely threaded steel bars.

[0015] Figure 2 This is an exploded three-dimensional structural diagram of a type of anchor bolt device for the end of finely threaded steel bars used in ultra-large raft foundations.

[0016] Figure 3 This is a cross-sectional view of an end anchor plate type anchor bolt device for finely threaded steel bars used in ultra-large raft foundations.

[0017] Figure 4 This is a three-dimensional structural diagram of an anchor plate for a type of anchor bolt device with end anchor plate for finely threaded steel bars used in ultra-large raft foundations.

[0018] In the diagram: 1. Anchor bolt body; 2. Anchor head end anchor plate; 3. Anchor tail end anchor plate; 31. Reserved hole; 4. Fixing nut; 5. Grouting hole; 6. Tie bar. Detailed Implementation

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0020] Combination Figure 1 , Figure 2 and Figure 3 As shown, an anchor bolt device for the end of finely threaded steel bars used in ultra-large raft foundations includes an anchor bolt body 1, an anchor head end anchor plate 2 at the top of the anchor bolt body 1, an anchor tail end anchor plate 3 at the bottom of the anchor bolt body 1, and fixing nuts 4 on both sides of the anchor head end anchor plate 2 and the anchor tail end anchor plate 3.

[0021] This invention proposes a high-strength, corrosion-resistant, precision-threaded steel bar end-anchor plate type anchor bolt device for ultra-large raft foundations, providing strong anchoring force to ensure the stability and safety of the raft foundation structure. It mainly includes an anchor bolt body 1, which serves as the core support structure of the entire anchor bolt device. The anchor bolt body 1 is made of high-strength, corrosion-resistant precision-threaded steel bars to ensure the stability and durability of the structure under extreme load conditions. The length of the anchor bolt body 1 is customized according to the specific dimensions and design requirements of the ultra-large raft foundation to meet the anchoring needs in different engineering scenarios.

[0022] An anchor head plate 2 is installed at the top of the anchor bolt body 1. The anchor head plate 2 is made of high-quality alloy steel plate, possessing excellent mechanical properties and fatigue resistance. Its design shape is typically circular or square to adapt to different installation environments and stress conditions. The anchor head plate 2 is securely connected to the top of the anchor bolt body 1 by high-strength bolts, ensuring that it will not loosen or fall off under enormous tensile forces.

[0023] The bottom end of the anchor bolt body 1 is equipped with an anchor tail plate 3. The structure of the anchor tail plate 3 is similar to that of the anchor head plate 2, and it is also made of high-strength alloy steel plate and is connected to the bottom end of the anchor bolt body 1 by bolts. The presence of the anchor tail plate 3 not only enhances the overall stability of the anchor bolt device, but also facilitates fixed connection with the foundation structure (such as a concrete foundation), thereby improving the anchoring effect.

[0024] On both sides of the anchor plate 2 at the anchor head end and the anchor plate 3 at the anchor tail end, a fixing nut 4 is provided. The fixing nut 4 is made of high-strength, corrosion-resistant alloy material, and has excellent thread fit and anti-loosening performance. By tightening it on the threaded section of the anchor body 1, the anchor plate 2 at the anchor head end and the anchor plate 3 at the anchor tail end are firmly locked in their respective positions on the anchor body 1, thereby ensuring that the entire anchor device can maintain stability and integrity when under stress.

[0025] This type of anchor bolt device for the end of finely threaded steel bars used in ultra-large raft foundations achieves efficient, stable, and reliable anchoring through carefully designed anchor bolt body, anchor plate, and fixing nut, providing strong protection for the stability and safety of ultra-large raft foundation structures.

[0026] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the anchor plate 2 at the anchor head end is a square steel plate structure, and two fixing nuts 4 are provided on each side of the anchor plate 2 at the anchor head end.

[0027] Specifically, the anchor plate 2 at the anchor head end is crucial for ensuring the stability and durability of the entire structure. The anchor plate 2 is designed as a square steel plate structure, providing a larger contact area and a more uniform stress distribution, thereby enhancing its stability and reliability under enormous tensile forces. The square steel plate structure also facilitates precise docking and secure connection with the top of the anchor body 1, ensuring that the connection strength between the two meets design requirements.

[0028] Two fixing nuts 4 are installed on each side of the anchor plate 2 at the anchor head end. These four fixing nuts 4 not only ensure sufficient connection strength in quantity, but also achieve symmetrical distribution in position, further enhancing the connection stability and torsional resistance between the anchor plate 2 at the anchor head end and the anchor body 1. The fixing nuts 4 are made of high-strength, corrosion-resistant alloy material to ensure good thread fit and anti-loosening performance even in extreme environments.

[0029] Combination Figure 1 , Figure 3 and Figure 4 As shown, the fixing nut 4 disposed on the side of the anchor plate 2 near the top of the anchor body 1 has at least 3 loose threads between it and the top of the anchor body 1.

[0030] Furthermore, the anchor plate 2 at the anchor head end is directly related to the stability and safety of the entire structure. The fixing nut 4, located on the side of the anchor plate 2 near the top of the anchor body 1, has at least three loose threads between it and the top of the anchor body 1. By retaining a certain number of loose threads, additional adjustment space and buffer allowance are provided for the connection between the anchor plate 2 and the anchor body 1. During the installation of the anchor bolt device, various factors (such as unevenness of the foundation structure, slight bending of the anchor body, etc.) may cause the connection between the anchor plate 2 and the anchor body 1 to be less than ideal. In this case, if the fixing nut 4 is fully tightened, excessive prestress may be generated due to inaccurate connection, even leading to connection failure. Leaving three loose threads can absorb these connection errors to a certain extent, ensuring that the fixing nut 4 can gradually adjust and reach the optimal tightening state during tightening. This not only improves the stability and reliability of the connection but also reduces potential safety risks caused by installation errors.

[0031] Under dynamic loads, anchor bolt devices may experience minor deformations and displacements. Leaving some threads loose provides necessary buffer space for these deformations and displacements, preventing damage to the connection due to excessive stress. Simultaneously, temperature changes may cause thermal expansion and contraction between the anchor bolt body 1 and the anchor plate 2 at the anchor head end. Leaving some threads loose can accommodate this thermal expansion and contraction to a certain extent, maintaining the stability and durability of the connection.

[0032] Combination Figure 1 , Figure 2 and Figure 4 As shown, the anchor plate 2 at the anchor head end is provided with a grouting hole 5 for grouting concrete.

[0033] Specifically, the injection hole 5 is provided on the anchor plate 2 at the anchor head end. This not only enhances the bonding force between the anchor device and the surrounding concrete foundation but also improves the stability and durability of the entire structure. The injection hole 5 is primarily designed to achieve a tight connection between the anchor device and the concrete foundation. After the anchor device is installed, high-strength concrete is injected into the gap between the anchor plate 2 at the anchor head end and the concrete foundation through the injection hole 5, forming a strong mechanical anchor. This effectively resists horizontal and vertical forces and maintains the stability of the structure under extreme load conditions such as earthquakes.

[0034] Secondly, to ensure that the concrete fully fills the gap between the anchor plate 2 at the anchor head end and the concrete foundation, the grouting holes 5 are usually designed with appropriate size and shape so that the concrete can flow in smoothly and be evenly distributed. At the same time, the number and location of the grouting holes 5 also need to be rationally arranged according to the specific size and installation requirements of the anchor bolt device to ensure the smooth progress of the grouting process.

[0035] The injection hole 5 also serves as a channel for inspection and maintenance. During the use of the anchor bolt device, its connection status and performance may need to be checked periodically. Through the injection hole 5, the connection between the anchor plate 2 at the anchor head end and the concrete foundation can be easily observed and inspected, as well as for potential problems such as cracks and corrosion. Furthermore, if maintenance or repair of the anchor bolt device is required, it can also be performed through the injection hole 5.

[0036] The design of the injection hole 5 also needs to consider its sealing performance. After injection, measures must be taken to ensure the sealing of the injection hole 5 to prevent harmful substances such as moisture and corrosive media from entering the anchor bolt device and causing damage. This can usually be achieved by installing a sealant or using sealing material at the injection hole 5.

[0037] Combination Figure 1 , Figure 2 and Figure 4 As shown, the anchor plate 3 at the anchor tail end is a circular steel plate structure, and a reserved hole 31 for secondary grouting is provided on the anchor plate 3 at the anchor tail end.

[0038] The anchor plate 3 at the anchor tail end is directly related to the connection stability between the anchor rod and the foundation structure and the overall anchoring effect. The anchor plate 3 at the anchor tail end adopts a circular steel plate structure and is equipped with a reserved hole 31 for secondary grouting, which reflects the engineer's profound understanding of structural safety and construction convenience.

[0039] First, the circular steel plate anchor plate 3 at the anchor tail end possesses excellent mechanical properties and resistance to deformation. Compared to other shapes, the circular structure can distribute stress more evenly under pressure, thereby effectively reducing structural damage caused by stress concentration. Furthermore, the circular steel plate is easy to process and install, ensuring precise alignment and a secure connection between the anchor tail end anchor plate 3 and the anchor rod body.

[0040] The pre-drilled hole 31 is designed to facilitate the crucial secondary grouting step. After the initial installation and concrete pouring of the anchor bolt device, the bond between the anchor bolt and the concrete may gradually weaken over time and with changes in load. At this point, secondary grouting through the pre-drilled hole 31 can refill the tiny gaps between the anchor bolt and the concrete, enhancing the bond and friction between them, thereby improving the anchoring effect of the anchor bolt device.

[0041] The reserved holes 31 for secondary grouting are typically designed to be of appropriate size and number to ensure that the grouting material can be fully filled and evenly distributed. At the same time, the location of the reserved holes 31 also needs to be rationally arranged according to the specific dimensions and installation requirements of the anchor bolt device to avoid damaging the structural integrity of the anchor bolt body.

[0042] The selection of grouting materials is also crucial during secondary grouting. The grouting material needs to have good fluidity and permeability to fully fill the pre-drilled holes 31 and the surrounding micro-voids. Simultaneously, the grouting material also needs to possess high strength and durability to ensure stable anchoring performance during long-term use.

[0043] Finally, it is worth noting that after the secondary grouting is completed, the reserved hole 31 needs to be properly sealed. This not only prevents the grouting material from leaking out, but also prevents harmful substances such as moisture and corrosive media from entering the anchor bolt device and causing damage. Sealing can usually be achieved using sealing materials or specialized sealing devices.

[0044] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the overall height of the fixing nut 4 is 100 mm.

[0045] Furthermore, the fixing nut 4, as a key component connecting the anchor head plate 2, the anchor tail plate 3, and the anchor rod body 1 in the anchor rod device, has dimensions that are crucial for ensuring the stability and durability of the entire structure. The overall height of the fixing nut 4 is set at 100mm, a size choice that reflects multiple considerations.

[0046] First, the overall height of 100mm provides sufficient strength and rigidity for the fixing nut 4. When the anchor bolt device is subjected to huge tensile or shear forces, the fixing nut 4 needs to be able to resist these external forces and maintain the stability and reliability of the connection. By setting a reasonable height, it can be ensured that the fixing nut 4 will not undergo plastic deformation or breakage under stress, thereby effectively ensuring the safety performance of the entire anchor bolt device.

[0047] Secondly, the 100mm height also takes into account the ease of construction and operability. During the installation of the anchor bolt device, the fixing nut 4 needs to be precisely matched with the threaded section of the anchor bolt body 1, and the anchor plate is locked by tightening. If the height of the fixing nut 4 is too low, it may increase the difficulty of construction, making it difficult to accurately align and tighten during installation. The 100mm height provides sufficient operating space for construction personnel, making the installation process smoother and more efficient.

[0048] During long-term use, the fixing nut 4 may be exposed to harsh environmental conditions, such as humidity, high temperature, or corrosive media. By setting an appropriate height, the surface area of ​​the fixing nut 4 can be increased, thereby providing it with more protective layer, reducing the contact area with corrosive media, and extending its service life.

[0049] Combination Figure 1 , Figure 2 and Figure 3 As shown, the anchor body 1 is made of prestressed threaded steel bar with a diameter of 40 mm.

[0050] Combination Figure 1 , Figure 2 and Figure 3 As shown, several tie rods 6 are welded to the upper end of the anchor rod body 1.

[0051] Specifically, the anchor body 1 is made of prestressed threaded steel bars with a diameter of 40 mm. Anchor body 1 not only possesses high strength and excellent toughness, but also maintains structural integrity and stability when subjected to enormous tensile forces. The selection of prestressed threaded steel bars is based on their unique mechanical properties and construction advantages. Prestressing treatment significantly improves the tensile strength and yield strength of the steel bars, thereby enhancing the load-bearing capacity of the anchor body 1. Simultaneously, the threaded design increases the bond strength between the steel bars and concrete, allowing the anchor body 1 to be more firmly fixed in the concrete, reducing the likelihood of pull-out or slippage.

[0052] Several tie rods 6 are welded to the upper end of the anchor bolt body 1. The arrangement and number of these tie rods 6 are determined according to the specific stress conditions and design requirements of the anchor bolt device. The tie rods 6 can enhance the overall rigidity and stability of the upper end of the anchor bolt body 1. When the anchor bolt device is subjected to tensile force, the tie rods 6 can work together with the anchor bolt body 1 to resist the action of external force and prevent the anchor bolt body 1 from bending or deforming.

[0053] During the manufacturing process of the anchor bolt assembly, strict control must be exercised over the material selection, welding process, and quality inspection of the anchor bolt body 1 and the tie rod 6. This ensures that the materials of the anchor bolt body 1 and the tie rod 6 meet design requirements, that the welded joints are strong and reliable, and that the overall structure is free from obvious defects and damage.

[0054] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A type anchor bolt device for the end of finely threaded steel bars used in ultra-large raft foundations, comprising an anchor bolt body (1), characterized in that, The top of the anchor body (1) is provided with an anchor head end plate (2), and the bottom of the anchor body (1) is provided with an anchor tail end plate (3). Both sides of the anchor head end plate (2) and the anchor tail end plate (3) are provided with fixing nuts (4).

2. The anchor plate type anchor bolt device for the end of finely threaded steel bars used in ultra-large raft foundations according to claim 1, characterized in that, The anchor plate (2) at the anchor head end is a square steel plate structure, and two fixing nuts (4) are provided on each side of the anchor plate (2).

3. The anchor plate type anchor bolt device for the end of finely threaded steel bars used in ultra-large raft foundations according to claim 2, characterized in that, At least three loose threads are left between the fixing nut (4) of the anchor plate (2) at the anchor head end and the top of the anchor body (1).

4. The end anchor plate type anchor bolt device for precision-stretched threaded steel bars used in ultra-large raft foundations according to claim 3, characterized in that, An anchor plate (2) at the anchor head end is provided with a grouting hole (5) for grouting concrete.

5. The anchor plate type anchor bolt device for the end of finely threaded steel bars used in ultra-large raft foundations according to claim 1, characterized in that, The anchor plate (3) at the tail end is a circular steel plate structure, and a reserved hole (31) for secondary grouting is provided on the anchor plate (3) at the tail end.

6. A type anchor bolt device for the end anchor plate of finely threaded steel bars for ultra-large raft foundations according to any one of claims 1 or 2, characterized in that, The overall height of the fixing nut (4) is 100 mm.

7. A type anchor bolt device for the end anchor plate of finely threaded steel bars for ultra-large raft foundations according to any one of claims 1-5, characterized in that, The anchor body (1) is made of prestressed threaded steel bar with a diameter of 40 mm.

8. A type anchor bolt device for the end anchor plate of precision-stretched threaded steel bars for ultra-large raft foundations according to claim 7, characterized in that, Several tie rods (6) are welded to the upper end of the anchor rod body (1).

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