A compact four-bundle anchor bolt suitable for space-constrained anchoring systems

Abstract

This invention relates to a compact four-strand anchor bolt suitable for space-constrained anchoring systems, comprising a web, a bearing plate, a locking plate, a stiffening plate, and flanges. The web includes a slotted web section with symmetrical slots along its centerline. The bearing plate is fixedly connected to both sides of the middle portion of the web. The locking plate is located below the bearing plate and fixedly connected to the middle portion of the web. One side of the stiffening plate is fixed to the bearing plate, and the other side is fixedly connected to the slotted web section. Flanges are fixedly located on both sides of the bearing plate. The advantages of this invention are: 1. By slotting the web and using a single stiffening plate for fixation, the overall load-bearing capacity is good and there is no stress concentration; 2. This invention can reduce the number of anchor bolts and the amount of steel used in the anchoring system when there are many main cable strands; 3. By welding, the use of high-strength bolts is avoided, increasing the service life of the anchor bolts.

Description

Technical Field

[0001] This invention relates to the field of bridge anchor technology, and in particular to a compact four-bundle anchor suitable for space-constrained anchoring systems. Background Technology

[0002] With the rapid development of modern suspension bridge technology, bridge spans and self-weights are increasing, leading to a corresponding increase in the diameter and number of main cable strands. The cable force of the entire suspension bridge's main cable is transmitted to the anchorage foundation through an anchoring system embedded in the anchorages. The size of the anchoring system directly determines the dimensions of the anchorage structure. Anchoring systems consist of various types of anchor bolts and rear anchor beams. Currently, the two main types of anchor bolts, single-strand anchor bolts and double-strand anchor bolts, have the following six problems: 1. The weld between the web plate and the stiffening plate is a critical force-transfer weld, which must be beveled or fully penetrated. Traditional anchor bolts have stiffening plates and flanges at the ends, limiting the welding space. Furthermore, the web plate is not grooved, so welding can only be done from the end of the stiffening plate with a single-sided bevel, making it difficult to guarantee weld quality and easily creating weak points in the structure; 2. When the number of main cable strands is large, the limited number of anchor bolts required by single and double-strand anchor bolts increases, directly leading to increased steel consumption and poor economic efficiency; 3. Due to the increased number of anchor bolts, the lateral and longitudinal dimensions of the anchoring system increase. 4. The increased number of anchor bolts leads to a longer production cycle, increased construction period and temporary support requirements, thus increasing construction costs. 5. Due to the special nature of some bridge sites, the scarcity of site resources restricts the size of anchor bolts. In such cases, the traditional single or double-bundle anchor bolt system can no longer meet the structural space requirements, hindering the feasibility of suspension bridge designs to some extent. 6. Traditional anchor bolt connections use high-strength bolts, but high-strength bolts inevitably have a delayed fracture phenomenon. Furthermore, because the anchor bolts are embedded inside the anchor bolt, they are permanent and cannot be replaced, thus leaving safety hazards. Summary of the Invention

[0003] This invention provides a compact four-strand anchor bolt suitable for space-constrained anchoring systems, addressing the following issues in related technologies: 1. Traditional anchor bolts have stiffening plates and flanges at the ends, limiting welding space; 2. Traditional single and double-strand anchor bolts have limitations in the number of anchor strands, requiring more anchor bolts, increasing steel consumption, raising manufacturing costs, and extending production and construction cycles, making them unsuitable for large-scale deployment; 3. Due to the special characteristics of some bridge sites, the scarcity of site resources restricts the size of anchor bolts, and traditional single and double-strand anchoring systems cannot meet structural space requirements, reducing the feasibility of suspension bridge designs; 4. Traditional anchor bolt connections use high-strength bolts, but high-strength bolts inevitably have a delayed fracture phenomenon, and the anchor bolts are embedded inside the anchor bolts, posing safety hazards.

[0004] On one hand, embodiments of the present invention provide a compact four-bundle anchor bolt suitable for space-constrained anchoring systems, comprising a web, a bearing plate, a locking plate, a stiffening plate, and flanges. The web includes a slotted web section, which has symmetrical slots along its centerline. The bearing plate is fixedly connected to both sides of the middle portion of the web. The locking plate is located below the bearing plate and fixedly connected to the middle portion of the web. One side of the stiffening plate is fixed to the bearing plate, and the other side is fixedly connected to the slotted web section. The flanges are fixedly located on both sides of the bearing plate.

[0005] In some embodiments, the pressure plate is provided in two parts and is fixed to the middle two sides of the web plate respectively.

[0006] In some embodiments, two pressure-bearing slots are formed on the two pressure plates, and the pressure-bearing slots are located on the side away from the web.

[0007] In some embodiments, the locking plate comprises four pieces, which are fixed in pairs to the middle two sides of the web plate.

[0008] In some embodiments, a locking slot is provided on each of the four locking plates, and the locking slot is located on the side close to the web plate.

[0009] In some embodiments, the stiffening plate includes a first stiffening plate, which is fixedly disposed on the web groove of the slotted web section. The section of the first stiffening plate near the bearing plate is a stiffening plate of equal width, and the section away from the bearing plate is a stiffening plate of varying width.

[0010] In some embodiments, the stiffening plate includes a second stiffening plate, which is fixed to the middle of the slotted web section. The section of the second stiffening plate near the bearing plate is a constant-width section, and the section away from the bearing plate is a variable-width section.

[0011] In some embodiments, the web further includes a standard web segment located below the slotted web segment, and a section at the bottom of the flange is a flange widening segment, which is fixedly connected to the slotted web segment.

[0012] In some embodiments, the web plate is connected to the pressure plate, locking plate, stiffening plate and flange by welding.

[0013] The beneficial effects of the technical solution provided by this invention include:

[0014] 1. By slotting the web and using a single stiffening plate for fixing, the overall load-bearing performance is good and there is no stress concentration. 2. This application can reduce the number of anchor bolts and the amount of steel used in the anchoring system when there are many main cable strands. 3. By welding, the use of high-strength bolts is avoided, increasing the service life of the anchor bolts. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a compact four-bundle anchor bolt suitable for space-constrained anchoring systems according to the present invention;

[0017] Figure 2 This is a schematic diagram of the locking plate of a compact four-bundle anchor bolt applicable to a space-constrained anchoring system according to the present invention;

[0018] Figure 3 This is a schematic diagram of the web of a compact four-bundle anchor bolt suitable for space-constrained anchoring systems according to the present invention.

[0019] Figure 4 This is one of the structural diagrams of a two-bunch anchor head construction in the existing technology;

[0020] Figure 5 This is the second structural diagram of a two-bunch anchor head construction in the existing technology.

[0021] In the figure: 1. Web plate; 11. Grooved web plate section; 12. Grooved web plate; 13. Standard web plate section; 2. Bearing plate; 21. Bearing groove; 3. Locking plate; 31. Locking groove; 4. Stiffening plate; 41. First stiffening plate; 42. Second stiffening plate; 43. Stiffening plate with constant width section; 44. Stiffening plate with variable width section; 5. Flange; 51. Flange with variable width section; 52. Flange with constant width section. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See Figures 1 to 3 As shown, this embodiment of the invention provides a compact four-bundle anchor bolt suitable for space-constrained anchoring systems, including a web plate 1, wherein the web plate 1 includes a slotted web plate segment 11, and the slotted web plate segment 11 is symmetrically provided with web plate slots 12 along the centerline;

[0024] The pressure plate 2 is fixedly connected to both sides of the middle part of the web plate 1;

[0025] Locking plate 3 is located on the lower side of the pressure plate 2 and is fixedly connected to the middle of the web plate 1;

[0026] The stiffening plate 4 is fixed on one side to the bearing plate 2 and fixedly connected to the slotted web section 11 on the other side;

[0027] Flange 5 is fixedly disposed on both sides of the pressure plate 2.

[0028] In this embodiment, the web plate 1 and the stiffening plate 4 are fixedly connected by welding. The weld between the web plate 1 and the stiffening plate 4 is a key force-transmitting weld, and it is welded by beveling or full penetration. In this application, a groove is cut in the web plate 1, and the entire stiffening plate 4 is embedded into the web plate groove 12 of the web plate 1 and welded, which is equivalent to the web plate 1 being broken. Since the stiffening plate 4 is a whole plate, welding can only be performed at the bevel of the web plate 1. Even if a single-sided beveling weld is performed, since the most critical force-transmitting plate (equivalent to the stiffening plate 4) is a defect-free whole plate, the overall stress performance is good, and there is no stress concentration phenomenon, which greatly improves the safety of the component.

[0029] Meanwhile, the welding method of this application completely eliminates the delayed fracture phenomenon caused by traditional high-strength bolt connections. The two key welds are staggered by 200mm, and a 30mm radius through-weld hole is opened at the junction to avoid welding defects and stress concentration. Furthermore, since no hole is opened in the cross section, there are no weak points in the entire anchor rod.

[0030] This application provides a four-strand anchor head that can simultaneously anchor four cable strands. Due to the advantage of the number of anchors, the new four-strand anchor head of this application greatly reduces the space occupied, shortens the construction period, and reduces costs, resulting in extremely high economic benefits.

[0031] See Figures 4 to 5 As shown, in traditional technology, the ends of anchor bolts are equipped with stiffening plates and flanges, which restricts the welding space. Furthermore, the web plate is not slotted, and welding can only be done from the end of the stiffening plate with a single-sided bevel, making it difficult to guarantee the quality of the weld and easily creating weak points in the structure. In addition, the high-strength bolts in the existing technology have an unavoidable delayed fracture phenomenon. High-strength bolts must be drilled, and since anchor bolts are purely tension members, the strength calculation uses the net area (member area - drilled area × number), which greatly reduces the stress area and lowers the safety of the structure.

[0032] Meanwhile, in traditional techniques, the web plate is not grooved, and two stiffening plates are welded to both sides of the web plate. In this case, the web plate is a single piece, and the two stiffening plates are essentially disconnected at the web plate. Welding can only be done by beveling at the stiffening plates on both sides. However, because the distance between the two stiffening plates on the same side is too small, beveling at the stiffening plates cannot be achieved. In this situation, it is impossible to bevele and weld on both sides simultaneously, and the integrity of the stiffening plates is compromised.

[0033] Because at the anchor head, the force transmission path is: the enormous pressure is transmitted through the bearing plate to the stiffening plate, then from the stiffening plate to the web plate, and finally from the web plate to the two flanges. At this point, the stiffening plate is the most critical force-transmitting component. Traditional anchor head welding methods, due to the beveled edges on the stiffening plate, introduce inherent defects to the plate, and since the stiffening plate is not a single, complete plate, the overall load-bearing capacity is reduced.

[0034] Secondly, when the number of main cable strands is large, the number of anchor bolts required increases due to the limitation of the number of single and double bundle anchor bolt strands. This directly leads to an increase in the amount of steel used in the anchoring system, resulting in excessively high production costs and hindering its promotion.

[0035] Traditional anchoring systems only have two types: single-strand and double-strand. A single-strand system can only anchor one strand, while a double-strand system can only anchor two strands.

[0036] Optionally, the pressure plate 2 is provided in two pieces, and is fixed on both sides of the middle part of the web plate 1 respectively.

[0037] Optionally, two pressure-bearing slots 21 are provided on the two pressure-bearing plates 2, and the two pressure-bearing slots 21 are located on the side away from the web plate 1.

[0038] Optionally, the locking plate 3 has four pieces, and each piece is fixed in pairs to the middle two sides of the web plate 1.

[0039] Optionally, each of the four locking plates 3 has a locking slot 31, and the locking slot 31 is located on the side close to the web plate 1.

[0040] Optionally, the stiffening plate 4 includes a first stiffening plate 41, which is fixedly disposed on the web groove 12 of the slotted web section 11. The first stiffening plate 41 is a stiffening plate equal width section 43 near the pressure plate 2 and a stiffening plate variable width section 44 away from the pressure plate 2.

[0041] Optionally, the stiffening plate 4 includes a second stiffening plate 42, which is fixed in the middle of the slotted web section 11. The section of the second stiffening plate 42 near the pressure plate 2 is a stiffening plate equal width section 43, and the section away from the pressure plate 2 is a stiffening plate variable width section 44.

[0042] Optionally, the web 1 further includes a standard web segment 13, which is located below the slotted web segment 11.

[0043] Optionally, a section at the bottom of the flange 5 is a flange widening section 51, which is fixedly connected to the slotted web section 11, and a section at the top of the flange 5 is a flange equal-width section 52, which is fixedly connected to the lower section of the web 1.

[0044] Optionally, the web plate 1 is connected to the pressure plate 2, locking plate 3, stiffening plate 4 and flange 5 by welding.

[0045] The beneficial effects of this invention are as follows:

[0046] 1. By slotting the web and using a single stiffening plate for fixing, the overall load-bearing performance is good and there is no stress concentration. 2. This application can reduce the number of anchor bolts and the amount of steel used in the anchoring system when there are many main cable strands. 3. By welding, the use of high-strength bolts is avoided, increasing the service life of the anchor bolts.

[0047] In the description of this invention, it should be noted that the terms "upper," "lower," 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 the invention 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 the invention. Unless otherwise expressly specified and limited, the terms "set," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0048] It should be noted that, in this application, relational terms such as "first" and "second" are used merely 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 term "comprising," or any other variation thereof, is 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 a process, method, article, or apparatus.

[0049] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A compact quad bundle anchor rod suitable for use in a space-restricted anchoring system, characterized by, It includes web (1), the web (1) includes slotted web section (11), the slotted web section (11) is provided with web slot (12) along the midline symmetry; Pressure plate (2), fixedly connected to the middle two sides of the web (1); Locking plate (3), is located in the lower side of the pressure plate (2), and is fixedly connected to the middle of the web (1); Stiffening plate (4), one side is fixed on the pressure plate (2), the other side is fixedly connected to the slotted web section (11); Flange (5), fixedly provided on both sides of the pressure plate (2); The web (1) and the stiffening plate (4) are welded and fixed by open groove welding or penetration welding, and welding is carried out at the cut groove of the web (1); The two welds of the web (1) and the stiffening plate (4) are staggered by 200mm, and a welding hole with a radius of 30mm is formed at the junction. The whole stiffening plate (4) is embedded into the web slot (12) of the web (1) and welded.

2. A compact quad bundle anchor rod suitable for use in a space-restricted anchoring system as claimed in claim 1, characterized in that, The pressure plate (2) is provided with two, and is fixed on the middle two sides of the web (1) respectively.

3. A compact quad bundle anchor rod suitable for use in a space-restricted anchoring system as claimed in claim 2, wherein, Two pressure slots (21) are formed on the two pressure plates (2), and the two pressure slots (21) are located away from the web (1).

4. A compact quad bundle anchor rod for use in a space-restricted anchoring system as defined in claim 1, wherein, The locking plate (3) is provided with four, and two are fixed on the middle two sides of the web (1).

5. A compact quad bundle anchor rod suitable for use in a space-restricted anchoring system as claimed in claim 4, wherein, One locking slot (31) is formed on the four locking plates (3), and the locking slot (31) is located close to the web (1).

6. A compact quad bundle anchor rod suitable for use in a space-restricted anchoring system as defined in claim 1, wherein, The stiffening plate (4) includes a first stiffening plate (41), which is fixedly provided on the web slot (12) of the slotted web section (11), and the first stiffening plate (41) is close to the pressure plate (2) One section is a stiffening plate equal width section (43), and the other section away from the pressure plate (2) is a stiffening plate variable width section (44).

7. A compact quad bundle anchor rod suitable for use in a space-restricted anchoring system as defined in claim 6, wherein, The stiffening plate (4) includes a second stiffening plate (42), which is fixed in the middle of the slotted web section (11), and the second stiffening plate (42) is close to the pressure plate (2) One section is a stiffening plate equal width section (43), and the other section away from the pressure plate (2) is a stiffening plate variable width section (44).

8. A compact quad bundle anchor rod for use in a space-restricted anchoring system as defined in claim 1, wherein, The web (1) further includes a standard web section (13), which is located below the slotted web section (11).

9. A compact quad bundle anchor rod suitable for use in a space-restricted anchoring system as defined in claim 1, wherein, A section of the bottom of the flange (5) is a flange variable width section (51), which is fixedly connected with the slotted web section (11), and a section of the top of the flange (5) is a flange equal width section (52), which is fixedly connected with the lower section of the web (1).

10. A compact quad bundle anchor rod suitable for use in a space-restricted anchoring system as defined in claim 1, wherein, The web (1) and the pressure plate (2), locking plate (3), stiffening plate (4) and the flange (5) are connected by welding.

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