A kind of inner pressure installation structure of finish rolling screw steel anchor rod anchor head

Abstract

The utility model relates to the technical field of anti -floating anchor rod, concretely is a kind of fine rolled threaded steel anchor rod anchor head internal pressure installation structure, including threaded steel anchor rod main body, the middle part threaded connection of threaded steel anchor rod main body one end is equipped with locating nut, the one end of the locating nut is equipped with metal backing plate, the one end fixed mounting of metal backing plate has conical plug, the one end threaded connection of threaded steel anchor rod main body has end anchor head, the periphery of the lower end of the middle part of end anchor head is all equipped with split groove, the middle part of the lower end of end anchor head is equipped with conical slot, the one end of conical slot is equipped with abutting slot, the one end threaded connection of threaded steel anchor rod main body is equipped with limiting nut.The utility model has solved the traditional anchor head, such as mortar bonding type, shell type relies on grouting solidification or knocking extrusion and generates anchoring force, internal pressure forms hysteresis and cannot be actively adjusted, there are many problems in actual use.

Description

Technical Field

[0001] This utility model relates to the field of anti-buoyancy anchor technology, specifically to an internal pressure installation structure for the anchor head of a precision-rolled threaded steel anchor. Background Technology

[0002] The anchor head of a precision-rolled threaded steel anchor bolt is a key component of the anchor bolt. Located at the exposed, non-anchored end of the anchor bolt, its main function is to transfer the tension of the anchor bolt to the supported structure, such as retaining walls and foundation pit retaining piles, and to achieve the fixing, tensioning, and locking of the anchor bolt. Its design and construction directly affect the load-bearing capacity of the anchor bolt and the safety of the project. In anti-buoyancy anchor bolt projects in buildings, precision-rolled threaded steel bars can not only improve construction efficiency, but also make full use of their high strength to reduce the total amount of steel bars used, thus saving materials.

[0003] Traditional anchor heads, such as mortar-bonded and expansion-shell types, rely on grouting solidification or hammering to generate anchoring force. The internal pressure formation is delayed and cannot be actively adjusted, leading to numerous shortcomings in practical use. For example, in emergency rescue projects following tunnel collapses, mortar-bonded anchor heads require waiting for the cement grout to solidify to its design strength before they can provide anchoring. During this period, the surrounding rock may continue to deform or even collapse secondary, missing the optimal support opportunity. Furthermore, expansion-shell anchor heads rely on manual hammering for expansion. Inconsistent worker strength makes precise control of the anchoring force difficult, resulting in large fluctuations in the actual anchoring force of the same batch of anchor heads. Some anchor heads may not expand sufficiently due to insufficient hammering, resulting in a small contact area with the borehole wall, loosening during excavation, and causing localized soil slippage. This necessitates re-installing anchor bolts, increasing material and labor costs. Utility Model Content

[0004] One of the technical problems this application aims to solve is that traditional anchor heads, such as mortar-bonded and expansion-shell types, rely on grouting solidification or hammering and squeezing to generate anchoring force. The internal pressure formation is delayed and cannot be actively adjusted, resulting in many shortcomings in practical use.

[0005] To address the aforementioned technical problems, this application provides an internal pressure installation structure for a precision-rolled threaded steel anchor head, comprising a threaded steel anchor body, a positioning nut threadedly connected to the middle of one end of the threaded steel anchor body, a metal washer provided at one end of the positioning nut, a tapered plug fixedly installed at one end of the metal washer, an end anchor head threadedly connected to one end of the threaded steel anchor body, a split groove formed around the lower part of the middle of the end anchor head, a tapered slot formed in the middle of the lower part of the end anchor head, an abutment groove formed at one end of the tapered slot, and a limit nut threadedly connected to one end of the threaded steel anchor body.

[0006] In some embodiments, the surface of the threaded steel anchor bolt body is uniformly threaded with multiple load-bearing sleeves.

[0007] In some embodiments, the bearing sleeve includes a bearing plate, a sleeve is fixedly installed at the center of the lower end of the bearing plate, and multiple notches are provided around the bearing plate.

[0008] In some embodiments, multiple reinforcing ribs are uniformly fixedly installed at the connection between the bearing plate and the sleeve.

[0009] In some embodiments, the end anchor head is slidably engaged with the middle of the conical slot, the smaller opening of the conical plug abuts against the abutment slot, and the split slot and the conical slot are connected.

[0010] In some embodiments, the metal pad is sleeved on the outer side of the middle part of the threaded steel anchor rod body and abuts against one end of the positioning nut; the larger opening of the conical plug abuts against one end of the metal pad; the upper end of the middle part of the end anchor head is threadedly connected to the threaded steel anchor rod body; and the limiting nut abuts against one end of the end anchor head.

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

[0012] 1. When in use, this utility model can achieve precise and controllable high-efficiency anchoring. The end anchor head is radially expanded by tightening the thread, and the internal pressure is directly related to the torque, realizing quantitative adjustment of the anchoring force. The symmetrical design of the split groove makes the anchor head uniformly squeeze the hole wall, reducing stress concentration. Compared with the traditional method, the anchoring efficiency and reliability are significantly improved.

[0013] 2. When this utility model is used, the multiple bearing sleeves on the surface of the threaded steel anchor rod can be adjusted in position as needed along the anchor rod body to form a multi-layer bearing interface, distributing the load to different strata; the notch design combined with grouting forms a toothed interlocking structure, and the reinforcing ribs enhance the rigidity, which can not only adapt to complex rock and soil layers, but also effectively improve the overall pull-out resistance. 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 three-dimensional structure of the bearing sleeve of this utility model;

[0016] Figure 3 This is a schematic diagram showing the connection relationship between the conical plug and the end anchor head of this utility model;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the conical plug and the end anchor head of this utility model.

[0018] In the diagram: 1. Main body of threaded steel anchor bolt; 11. Positioning nut; 12. Metal washer; 13. Conical plug; 14. End anchor head; 15. Limiting nut; 16. Split groove; 17. Conical slot; 18. Abutment groove; 2. Bearing sleeve; 21. Bearing plate; 22. Sleeve; 23. Reinforcing rib; 24. Notch. 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: an internal pressure installation structure for a precision-rolled threaded steel anchor head, comprising a threaded steel anchor body 1, a positioning nut 11 threadedly connected to the middle of one end of the threaded steel anchor body 1, a metal washer 12 provided at one end of the positioning nut 11, a conical plug 13 fixedly installed at one end of the metal washer 12, an end anchor head 14 threadedly connected to one end of the threaded steel anchor body 1, a split groove 16 formed around the lower part of the middle of the end anchor head 14, a conical slot 17 formed in the middle of the lower part of the end anchor head 14, and a stop provided at one end of the conical slot 17. The groove 18 is threaded to one end of the threaded steel anchor rod body 1, with a limiting nut 15 connected to it. The end anchor head 14 is slidably engaged in the middle of the conical slot 17. The smaller opening of the conical plug 13 abuts against the groove 18. The split groove 16 is connected to the conical slot 17. The metal pad 12 is sleeved on the outer side of the middle of the threaded steel anchor rod body 1 and abuts against one end of the positioning nut 11. The larger opening of the conical plug 13 abuts against one end of the metal pad 12. The upper end of the middle of the end anchor head 14 is threaded to the threaded steel anchor rod body 1, and the limiting nut 15 abuts against one end of the end anchor head 14.

[0021] In this embodiment, the positioning nut 11, the metal pad 12, and the conical plug 13 work together to quickly position the anchor rod. The limiting nut 15 is threadedly connected to the end anchor head 14, which facilitates adjustment of the installation depth and fixation. The limiting nut 15 can limit the position of the end anchor head 14 to prevent the end anchor head 14 from shifting when the conical plug 13 squeezes the conical slot 17. When the threaded steel anchor rod body 1 is tightened, the smaller opening of the conical plug 13 will push into the conical slot 17 and eventually abut against the slot opening. Its conical slope will squeeze the conical slot 17, forcing the end anchor head 14 to expand radially along the split groove 16, actively applying internal pressure to the borehole wall. The magnitude of the internal pressure can be controlled by the torque of tightening the threaded steel anchor rod body 1, realizing the quantitative adjustment of the anchoring force. The split groove 16 is evenly opened around the end anchor head 14. After expansion, it will form a uniform and symmetrical annular internal pressure, making the anchor head and the opened borehole wall fit tightly around the entire circumference, reducing local stress concentration, and improving the overall friction and mechanical interlocking force of the anchoring interface. The internal pressure is generated by the mechanical force of thread tightening rather than traditional hydraulic or hammering. No additional equipment is required. It is suitable for drilling environments with limited space or complex geological conditions, such as narrow tunnel areas and fractured rock strata.

[0022] Example 2: As Figures 1-2 As shown, the surface of the threaded steel anchor rod body 1 is uniformly threaded with multiple bearing sleeves 2. The bearing sleeve 2 includes a bearing plate 21. A sleeve 22 is fixedly installed in the middle of the lower end of the bearing plate 21. Multiple notches 24 are opened around the bearing plate 21. Multiple reinforcing ribs 23 are uniformly fixedly installed at the connection between the bearing plate 21 and the sleeve 22.

[0023] In this embodiment, multiple bearing sleeves 2 are evenly distributed along the main body 1 of the threaded steel anchor rod, forming a multi-layer bearing interface within the borehole. When the anchor rod is under stress, each bearing plate 21 engages with the surrounding soil and rock through notches 24, distributing the load to strata at different depths, avoiding stress concentration in a single anchoring section, and improving overall pull-out resistance. The sleeve 22 is threadedly connected to the main body 1 of the threaded steel anchor rod, and the sleeve position can be adjusted to adapt to different soil and rock layer distributions, enabling the bearing layer to be set as needed and optimizing the anchoring force distribution. The notches 24 of the bearing plate 21 are designed to increase the contact area with the grouting body or soil and rock, forming a toothed interlocking structure after grouting, which significantly improves the interface bonding strength. The reinforcing ribs 23 connect the bearing plate 21 and the sleeve 22, enhancing the overall rigidity of the sleeve, preventing the bearing plate 21 from bending and deforming under high loads, and ensuring the reliability of load transfer.

[0024] like Figures 1-4As shown, during use, the tapered plug 13 is fixed to the end of the threaded steel anchor rod body 1 by the abutment of the positioning nut 11 and the metal pad 12. When inserted into the drill hole, the guiding effect of the tip of the tapered plug 13 can quickly align with the hole position, ensuring that the anchor rod is installed in the center. Then, the limiting nut 15 is rotated to adjust its relative position with the end anchor head 14, controlling the installation depth of the anchor head in the drill hole. When the positioning nut 11 is tightened, the smaller opening of the tapered plug 13 will push into the tapered slot 17 and force the end anchor head 14 to expand radially along the split groove 16, actively squeezing the drill hole wall to form an annular internal pressure. By controlling the thread tightening torque, the pushing distance of the tapered plug 13 can be precisely adjusted, thereby controlling the expansion degree of the end anchor head 14 and realizing the quantitative control of the anchoring force. The even distribution of the split groove 16 makes the anchor head expand to form symmetrical internal pressure, avoiding local stress concentration. The bearing sleeve 2, which is evenly distributed along the anchor rod body, forms a multi-layer bearing interface with the surrounding rock and soil or grout through the bearing plate 21. When the anchor rod is under stress, the notch 24 of each bearing plate 21 engages with the grouting body or is directly embedded in the soil and rock, distributing the load to different depths of the strata and avoiding overloading of a single anchoring section.

[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 finishing screw steel anchor rod anchor head inner pressure installation structure, comprising a screw steel anchor rod body (1), characterized in that: A positioning nut (11) is threadedly connected to the middle of one end of the threaded steel anchor rod body (1). A metal pad (12) is provided at one end of the positioning nut (11). A conical plug (13) is fixedly installed at one end of the metal pad (12). An end anchor head (14) is threadedly connected to one end of the threaded steel anchor rod body (1). Split grooves (16) are provided around the lower part of the middle of the end anchor head (14). A conical slot (17) is provided in the middle of the lower part of the end anchor head (14). An abutment groove (18) is provided at one end of the conical slot (17). A limit nut (15) is threadedly connected to one end of the threaded steel anchor rod body (1).

2. The inner pressure installation structure of the finished rolled threaded steel anchor head according to claim 1, characterized in that: The surface of the threaded steel anchor body (1) is uniformly threaded with multiple bearing sleeves (2).

3. The inner pressure installation structure of the finished rolled threaded steel anchor head according to claim 2, characterized in that: The bearing sleeve (2) includes a bearing plate (21), and a sleeve (22) is fixedly installed in the middle of the lower end of the bearing plate (21). Multiple notches (24) are opened around the bearing plate (21).

4. The internal pressure installation structure for the anchor head of a precision-rolled threaded steel anchor bolt according to claim 3, characterized in that: Multiple reinforcing ribs (23) are uniformly fixed at the connection between the bearing plate (21) and the sleeve (22).

5. The internal pressure installation structure for the anchor head of a precision-rolled threaded steel anchor bolt according to claim 1, characterized in that: The end anchor (14) is slidably engaged in the middle of the conical slot (17), the smaller opening of the conical plug (13) abuts against the abutment slot (18), and the split slot (16) and the conical slot (17) are connected.

6. The internal pressure installation structure for the anchor head of a precision-rolled threaded steel anchor bolt according to claim 1, characterized in that: The metal pad (12) is fitted on the outer side of the middle part of the threaded steel anchor rod body (1) and abuts against one end of the positioning nut (11). The larger opening of the conical plug (13) abuts against one end of the metal pad (12). The upper end of the middle part of the end anchor head (14) is threadedly connected to the threaded steel anchor rod body (1). The limiting nut (15) abuts against one end of the end anchor head (14).

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