A PSB precision rolled threaded steel anti-buoyancy anchor structure

Abstract

This utility model relates to the field of foundation engineering technology, specifically a PSB precision-rolled threaded steel anti-buoyancy anchor structure, including a hollow threaded steel anchor. Guide grooves are formed around the lower part of the hollow threaded steel anchor. A pressure rod is slidably engaged in the center of each guide groove. Guide rods are fixedly installed around the center of each pressure rod. A base plate is fixedly installed at the lower center of the pressure rod. Placement grooves are formed around the center of each base plate. Connecting rods are rotatably connected above and below the center of multiple placement grooves. One end of each set of connecting rods is rotatably connected to a protruding plate. This utility model solves the problems of traditional anchors, which are usually straight rod structures, relying on the adhesion between the rod body and the grouting body and passive resistance at the ends for anchoring. This results in a single anchoring method and many shortcomings in practical use.

Description

Technical Field

[0001] This utility model relates to the field of foundation engineering technology, specifically to a PSB precision rolled threaded steel anti-buoyancy anchor structure. Background Technology

[0002] In the field of civil engineering, HRB steel bars are the primary material for anti-buoyancy anchors. However, HRB steel bars have low tensile strength, and using them as the reinforcement in anti-buoyancy anchors results in a large consumption of steel bars and a significant occupation of space. Using PSB precision-rolled threaded steel bars as the material for anti-buoyancy anchors can effectively improve the tensile strength of the anchor bar, thereby increasing its pull-out bearing capacity. The core of achieving anti-buoyancy with threaded steel anchors is to effectively connect the anchor bar to the ground, converting the buoyancy force of groundwater on the structure into the pull-out force of the anchor bar and transferring it to the deep, stable strata.

[0003] Traditional anchor bolts are typically straight rods, relying on the bond between the rod and the grout and passive end resistance for anchoring. This single anchoring method has several shortcomings in practical use. For example, their pull-out resistance is limited. In areas where the soil is mostly loose sand, the low cohesion of the loose sand makes it difficult to fully utilize the bond between the anchor bolt and the grout. This can lead to some anchor bolts being pulled out entirely under the buoyancy of groundwater, requiring rework and thus extending the construction period. Utility Model Content

[0004] One of the technical problems that this application aims to solve is that traditional anchor rods are usually straight rod structures that rely on the bonding force between the rod body and the grouting body and the passive resistance at the end for anchoring. The anchoring form is singular and has many shortcomings in practical use.

[0005] To address the aforementioned technical problems, this application provides a PSB precision-rolled threaded steel anti-buoyancy anchor structure, comprising a hollow threaded steel anchor. Guide grooves are formed around the lower center of the hollow threaded steel anchor. A pressure rod is slidably engaged in the center of each guide groove. Guide rods are fixedly installed around the center of each pressure rod. A base plate is fixedly installed in the center of the lower end of the pressure rod. Placement grooves are formed around the center of each base plate. Connecting rods are rotatably connected above and below the center of each of the placement grooves. One end of each set of connecting rods is rotatably connected to a protruding plate.

[0006] In some embodiments, connecting plates are fixedly installed around the lower center of the hollow threaded steel anchor rod, a sliding groove is formed between the middle of the multiple connecting plates, and an anchor head is fixedly installed at one end of the multiple connecting plates.

[0007] In some embodiments, baffles are fixedly installed around the lower center of the hollow threaded steel anchor rod, and the lower ends of the plurality of protruding plates abut against the corresponding baffles.

[0008] In some embodiments, the outer surfaces above and below the middle of the hollow threaded steel anchor rod are threaded with a bearing body, and notches are opened around the lower ends of the two bearing bodies.

[0009] In some embodiments, the guide rod and the guide groove are slidably engaged, and the surfaces of the plurality of protruding plates are provided with grooves.

[0010] In some embodiments, the plurality of protruding plates are slidably engaged in corresponding sliding grooves, and the inner diameter of the plurality of protruding plates in the unfolded state is larger than the inner diameter of the hollow threaded steel anchor rod.

[0011] This utility model has at least the following beneficial effects:

[0012] 1. When in use, this utility model has a strong anchoring force after fixing, which can achieve efficient anti-buoyancy. The expansion of the umbrella-shaped protruding plate forms an enlarged head, which stimulates passive earth pressure. In conjunction with the groove on the surface of the protruding plate and the toothed engagement of the grouting body, the mechanical force and the bonding force work together to achieve a synergistic effect. Compared with traditional anchor bolts, the pull-out resistance is greatly improved. It is especially suitable for anti-buoyancy in soft strata and has higher practicality.

[0013] 2. This utility model is convenient to use and has a short construction period. The hollow rod body can realize the simultaneous operation of drilling, anchoring and grouting, reducing the number of procedures. The guide rod and baffle design ensures the precise expansion of the protruding plate, avoids installation deviation, improves the overall construction efficiency, and can effectively shorten the project cycle. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the hollow threaded steel anchor rod of this utility model;

[0016] Figure 3 This is a schematic diagram showing the connection relationship between the pressure bar and the protruding plate of this utility model;

[0017] Figure 4 This is a schematic diagram of the unfolded structure of the protruding plate of this utility model.

[0018] In the figure: 1. Hollow threaded steel anchor rod; 11. Anchor head; 12. Connecting plate; 13. Sliding groove; 14. Bearing body; 15. Notch; 16. Baffle plate; 2. Guide groove; 21. Pressure rod; 22. Guide rod; 23. Base plate; 24. Placement groove; 25. Connecting rod; 26. Protruding plate; 27. Groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1: Please refer to Figures 1-4 This utility model provides a technical solution: a PSB precision-rolled threaded steel anti-buoyancy anchor rod structure, including a hollow threaded steel anchor rod 1. Guide grooves 2 are formed around the lower part of the hollow threaded steel anchor rod 1. A pressure rod 21 is slidably engaged in the middle of the guide grooves 2. Guide rods 22 are fixedly installed around the middle of the pressure rod 21. A base plate 23 is fixedly installed in the middle of the lower end of the pressure rod 21. Placement grooves 24 are formed around the bottom plate 23. Connecting rods 25 are rotatably connected to the upper and lower parts of the middle of the multiple placement grooves 24. Multiple sets of connecting rods 25... One end of each of the hollow threaded steel anchor rods 1 is rotatably connected to a protruding plate 26. Connecting plates 12 are fixedly installed around the lower middle part of the hollow threaded steel anchor rod 1. A sliding groove 13 is formed between the middle parts of the multiple connecting plates 12. An anchor head 11 is fixedly installed at one end of the multiple connecting plates 12. The guide rod 22 and the guide groove 2 are slidably engaged. The surface of the multiple protruding plates 26 is provided with a groove 27. The multiple protruding plates 26 are slidably engaged in the corresponding sliding groove 13. The inner diameter of the multiple protruding plates 26 in the unfolded state is larger than the inner diameter of the hollow threaded steel anchor rod 1.

[0021] In this embodiment, when the base plate 23 moves downward by the pressure rod 21, the connecting rod 25 pushes the protruding plate 26 to expand radially along the sliding groove 13, forming an umbrella-shaped expanded anchoring end with an inner diameter larger than that of the hollow threaded steel anchor rod 1. The expanded head resists the upward pull-out force through passive earth pressure. In soft strata such as sand and silt, the pull-out resistance can be significantly improved compared to traditional straight anchor rods. After grouting, the groove 27 on the surface of the protruding plate 26 forms a toothed interlocking structure with the cement grout. The mechanical interlocking force is superimposed with the bonding force, reducing the risk of slippage at the anchoring interface. The lower anchor head 11 provides the basic anchoring force, and the expanded head of the upper protruding plate 26 shares the load, forming a double anchoring section force system to avoid stress concentration in a single area. The hollow threaded steel anchor rod 1 can be directly used as a grouting channel to realize the synchronous operation of drilling, anchoring, and grouting. There is no need for the split installation process of traditional anchor rods, which can effectively shorten the construction period. The sliding engagement design of the guide rod 22 and the guide groove 2 ensures that the pressure rod 21 moves vertically, so that the protruding plate 26 expands evenly.

[0022] Example 2: As Figures 1-2As shown, baffles 16 are fixedly installed around the lower middle part of the hollow threaded steel anchor rod 1. The lower ends of multiple protruding plates 26 abut against the corresponding baffles 16. The outer surfaces above and below the middle part of the hollow threaded steel anchor rod 1 are threaded with bearing bodies 14. The lower ends of the two bearing bodies 14 are provided with notches 15 around their respective sides.

[0023] In this embodiment, the lower end of the protruding plate 26 abuts against the baffle 16, which can limit the position of the upper pressure rod 21 and multiple protruding plates 26 when not in use. When in use, pressing can break multiple baffles 16, allowing them to slide down, thus opening up multiple umbrella-like structures at the lower end. The upper and lower sets of bearing bodies 14 are distributed along the anchor rod axis, forming a three-dimensional anchoring structure of upper bearing body 14, enlarged head of protruding plate 26, and lower bearing body 14. Each set of bearing bodies 14 forms a toothed engagement with the grouting body through the notch 15. Under the action of upward pull force, the upper bearing body 14 resists the shear of shallow soil, and the enlarged head of lower protruding plate 26 provides deep anchoring force, which can effectively distribute the load and avoid overloading of a single anchoring section. The notch 15 increases the contact area between the bearing body 14 and the grouting body, and after grouting, a locking structure of boss and grout is formed, which inhibits the slippage between the bearing body 14 and the grouting body.

[0024] like Figures 1-4 As shown, before use, the hollow threaded steel anchor rod 1 and its internal components are in their initial state. At this time, the protruding plate 26 is folded into the sliding groove 13 at the lower end of the hollow threaded steel anchor rod 1, with an outer diameter consistent with the rod body, facilitating drilling. After drilling, the pressure rod 21 is pushed downward along the guide groove 2 by external force such as a hydraulic jack or mechanical wrench. During this process, the baffle 16 will break. Subsequently, the pressure rod 21 drives the bottom plate 23 to move downward synchronously. The bottom plate 23 pushes the protruding plate 26 radially along the sliding groove 13 through the connecting rod 25 in the placement groove 24, thereby forming an umbrella-shaped expanded anchoring end. At this time, multiple protruding plates... The inner diameter of the connecting rod 26 is larger than the diameter of the rod body. The connecting rod 25, the base plate 23, and the protruding plate 26 form a rigid triangular structure, which can be directly injected through the channel inside the hollow threaded steel anchor rod 1. After solidification, it will lock the expansion state of the protruding plate 26. The grout will overflow from the lower end of the rod body, fill the gap between the protruding plate 26 and the hole wall, and wrap the notch 15 of the bearing body 14. After the groove 27 on the surface of the protruding plate 26 is filled with grout, it forms a sawtooth interlocking structure. In soft strata such as sand and silt, the enlarged head will squeeze the surrounding soil after being compressed, stimulating passive earth pressure, thereby resisting the pull-out force caused by the buoyancy of groundwater. Compared with traditional straight rod anchor rods, the enlarged head significantly increases the lateral force-bearing area of ​​the anchoring section, and the pull-out resistance can be greatly improved. The notch 15 of the bearing body 14 forms an annular locking zone, which inhibits the relative slippage between the grout and the rod body.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A PSB finish-rolled threaded steel anti-floating anchor structure, comprising a hollow threaded steel anchor rod (1), characterized in that: The hollow threaded steel anchor rod (1) has guide grooves (2) around its lower middle section. A pressure rod (21) is slidably engaged in the middle of the guide groove (2). Guide rods (22) are fixedly installed around the middle of the pressure rod (21). A base plate (23) is fixedly installed in the middle of the lower end of the pressure rod (21). Placement grooves (24) are opened around the bottom plate (23). Connecting rods (25) are rotatably connected above and below the middle of the multiple placement grooves (24). One end of the multiple sets of connecting rods (25) is rotatably connected to a protruding plate (26).

2. The anti-floating anchor structure of the PSB finished rolled threaded steel according to claim 1, characterized in that: The hollow threaded steel anchor rod (1) has connecting plates (12) fixedly installed around the middle of the lower end. A sliding groove (13) is formed between the middle of the multiple connecting plates (12). An anchor head (11) is fixedly installed at one end of the multiple connecting plates (12).

3. The anti-floating anchor structure of the PSB finish rolled threaded steel according to claim 2, characterized in that: The hollow threaded steel anchor rod (1) is fixedly installed with baffles (16) around the middle of the lower end, and the lower ends of the multiple protruding plates (26) abut against the corresponding baffles (16).

4. The anti-floating anchor structure of the PSB finish rolled threaded steel according to claim 2, characterized in that: The hollow threaded steel anchor rod (1) has a bearing body (14) threadedly connected to the outer surface of the upper and lower parts of the middle part, and the two bearing bodies (14) have notches (15) around their lower ends.

5. The anti-floating anchor structure of the PSB finish rolled threaded steel according to claim 1, characterized in that: The guide rod (22) and the guide groove (2) are slidably engaged, and the surfaces of the multiple protruding plates (26) are provided with grooves (27).

6. The PSB precision-rolled threaded steel anti-buoyancy anchor structure according to claim 1, characterized in that: Multiple protruding plates (26) are respectively slidably engaged in corresponding sliding grooves (13), and the inner diameter of the multiple protruding plates (26) in the unfolded state is the inner diameter of the hollow threaded steel anchor rod (1).

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