Large-tonnage multi-stage pressure-equalizing fatigue-resistant prestressed anchor device

Abstract

The utility model provides a big tonnage multistage equalizing anti -fatigue prestressed anchorage device, and its through multistage equalizing and anti -fatigue design, eliminate sudden anchorage failure, including connecting sleeve and center sleeve, the upper and lower end surface of the cylinder of connecting sleeve extends equalizing toroidal surface, be provided with a plurality of support block along the circular array of connecting sleeve lateral wall even distribution between two equalizing toroidal surfaces, still extend at least two pairs of symmetric distribution of cross section shows '' GONG '' type reinforcing beam from the outer edge of support block, wherein the top surface and bottom surface of reinforcing beam are coplanar with equalizing toroidal surface, center sleeve is sleeved in connecting sleeve, and the length of center sleeve is more than connecting sleeve, and uses first locking nut to lock center sleeve and steel bar pull rod in one end, uses second locking nut to lock center sleeve and connecting sleeve in the other end, uses third taper locking nut to lock center sleeve and steel bar pull rod.

Description

Technical Field

[0001] This utility model relates to the field of prestressed anchorages, specifically to a large-tonnage multi-stage equal pressure anti-fatigue prestressed anchorage. Background Technology

[0002] With the development of major projects such as large bridges, super high-rise buildings, and offshore wind power, prestressed anchorages, as core load-bearing components, face three major technical challenges: large tonnage loads, high-frequency dynamic load fatigue, and long-term stress concentration. Traditional anchorages exhibit the following key defects:

[0003] 1. Structural bottlenecks in heavy load-bearing: Existing anchorages mostly adopt single-layer sleeves or simple thickening designs, which have fatal problems under loads exceeding 10,000 tons, such as sleeve deformation failure, insufficient circumferential stiffness of the cylinder leading to elliptical deformation, and prestress loss; the support system is weak, and the ultimate load-bearing capacity is difficult to exceed 6,000 tons.

[0004] 2. Uneven stress transfer leads to a chain of risks. The load transfer path is singular and the pressure equalization capacity is seriously insufficient: local crushing, stress concentration on the concrete contact surface under the anchor, causing spalling of the bearing surface; thread engagement failure, single-point locking between the central sleeve and the tie rod, and the stress at the root of the thread under dynamic load accelerates the propagation of fatigue cracks.

[0005] 3. Systemic defects in fatigue resistance and sealing, loss of control of fretting wear, and micro-vibration between the steel tie rod and the sealing element cause the leakage rate of the rubber sealing cover to exceed 90% after repeated cycles. Utility Model Content

[0006] The purpose of this utility model is to provide a large-tonnage multi-stage equal pressure anti-fatigue prestressed anchor, which eliminates sudden anchorage failure through multi-stage equal pressure and anti-fatigue design, and is suitable for ultra-large tonnage and high dynamic load scenarios such as bridge cable stays, nuclear power containment vessels, and offshore wind power.

[0007] The embodiments of this utility model are implemented as follows:

[0008] A large-tonnage, multi-stage equipotential pressure fatigue-resistant prestressed anchorage includes:

[0009] A connecting sleeve has pressure-equalizing annular surfaces extending from the upper and lower end faces of the sleeve body. Between the two pressure-equalizing annular surfaces, multiple support blocks are evenly distributed in a circular array along the side wall of the connecting sleeve. At least two pairs of symmetrically distributed reinforcing beams with an "I"-shaped cross-section extend radially from the outer edge of the support blocks. The top and bottom surfaces of the reinforcing beams are coplanar with the pressure-equalizing annular surfaces.

[0010] A center sleeve is fitted inside the connecting sleeve. The length of the center sleeve is greater than that of the connecting sleeve. One end of the center sleeve and the reinforcing bar tie rod are locked together using a first locking nut, and the other end of the center sleeve and the connecting sleeve are locked together using a second locking nut. A third conical locking nut is used to lock the center sleeve and the reinforcing bar tie rod together.

[0011] In a preferred embodiment of this utility model, 8-12 support blocks are provided, and the support blocks have a structure that is wide and thick at both ends and thins in the middle.

[0012] In a preferred embodiment of this utility model, the above-mentioned reinforcing beam and the annular surface are rounded, and the connection between the flange and the web of the reinforcing beam is rounded.

[0013] In a preferred embodiment of the present invention, one or more slotted annular pressure distribution rings are provided between the outer wall of the central sleeve and the inner wall of the connecting sleeve.

[0014] In a preferred embodiment of this invention, a gasket is provided on the surface of the aforementioned pressure-equalizing annular surface.

[0015] In a preferred embodiment of the present invention, the anchor further includes a composite cover plate, which is a cylindrical body with a circular plate at one end. A through hole for the steel bar tie rod to pass through is provided in the middle of the composite cover plate. The circular plate and the pressure equalizing annular surface of the composite cover plate respectively bear pressure on the upper and lower end faces of the steel beam to be assembled.

[0016] In a preferred embodiment of the present invention, the interior of the circular plate is an annular thin steel plate with holes and serrated edges on its surface; the exterior of the thin steel plate is a rubber layer.

[0017] In a preferred embodiment of this utility model, two sealing lips are provided on the inner wall of the through hole of the above-mentioned cylindrical body, and the sealing lips are made of hydrogenated nitrile rubber.

[0018] In a preferred embodiment of this invention, a stainless steel spring ring is pre-embedded at the root of the sealing lip.

[0019] The beneficial effects of this utility model embodiment are:

[0020] 1. The newly designed anchor features a connecting sleeve with equipotential ring surfaces on its upper and lower ends. These ring surfaces are connected by multiple evenly distributed circular support blocks in conjunction with at least two pairs of I-beam reinforcing beams to form a ring truss structure, enabling multi-path load transfer. The flanges of the I-beams are coplanar with the equipotential ring surfaces, directly participating in bearing pressure, increasing bending stiffness by more than 50%, and achieving an ultimate bearing capacity exceeding 10,000 tons.

[0021] 2. The central sleeve adopts a first locking nut for fixing the reinforcing bar, a second locking nut for connecting the sleeve, and a third tapered nut for anchoring the tie rod, forming redundant locking to avoid single-point failure, which is especially suitable for dynamic load conditions;

[0022] 3. The pressure of the steel bar tie rod is sequentially transmitted to the third conical nut, the central sleeve, the annular pressure distribution ring, the connecting sleeve, the support block array, the pressure equalizing annular surface and the gasket, and then transmitted to the steel beam, forming a multi-stage pressure transmission chain to eliminate stress concentration. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the assembly structure of a prestressed anchorage according to an embodiment of the present invention;

[0025] Figure 2 This is a top view of the connecting sleeve structure according to an embodiment of the present utility model;

[0026] Figure 3 This is a three-dimensional structural diagram of the connecting sleeve according to an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the annular pressure distribution ring according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the composite cover plate structure according to an embodiment of the present utility model.

[0029] Icons: Connecting sleeve 1; Pressure equalizing annular surface 11; Support block 12; Reinforcing beam 13; Annular pressure distribution ring 2; Central sleeve 3; First locking nut 4; Second locking nut 5; Third conical locking nut 6; Washer 7; Composite cover plate 8; Circular plate 81; Thin steel plate 811; Rubber layer 812; Wear-resistant layer 813; Cylindrical body 82; Sealing lip 821; Spring ring 822; Rebar tie rod 9. Detailed Implementation

[0030] 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] 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., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 based on the specific circumstances.

[0036] First Embodiment

[0037] Please refer to Figure 1 This embodiment provides a large-tonnage multi-stage equal pressure fatigue-resistant prestressed anchor, which includes a connecting sleeve 1, an annular pressure distribution ring 2, a central sleeve 3, a first locking nut 4, a second locking nut 5, a third conical locking nut 6, a gasket 7, and a composite cover plate 8.

[0038] Please see below. Figure 2 and 3 The upper and lower end faces of the connecting sleeve 1 extend into pressure-equalizing annular surfaces 11, expanding the contact area with the steel beam. Multiple support blocks 12, evenly distributed in a circular array along the sidewall of the connecting sleeve 1, are arranged between the two pressure-equalizing annular surfaces 11 for pressure transmission and support, uniformly transferring the enormous pressure from the anchor to the bearing surface of the concrete / steel beam. In this embodiment, the support blocks 12 are variable cross-section support blocks 12, with a structure that is thicker at both ends and thinner in the middle, making its stress distribution more uniform. Eight to twelve support blocks 12 are provided; more support blocks 12 can more evenly distribute the load transmitted from the central sleeve 3, reducing the stress level of a single support block 12.

[0039] At least two pairs of symmetrically distributed reinforcing beams 13 with an "I"-shaped cross-section extend radially from the outer edge of the support block 12. In Figure 3, only one pair of reinforcing beams 13 is shown for clarity of the internal structure of the support block 12. The top and bottom surfaces of the reinforcing beams 13 are coplanar with the pressure-equalizing annular surface 11, significantly improving the circumferential stiffness and bending resistance of the entire connecting sleeve 1 under extremely heavy tonnage conditions, preventing elliptical deformation or buckling of the sleeve under extreme loads. In this embodiment, the reinforcing beams 13 have rounded transitions with the annular surface, and the flanges of the reinforcing beams 13 also have rounded transitions at the connection points with the web, reducing stress concentration.

[0040] The central sleeve 3 is made of ultra-high strength alloy steel and undergoes precision heat treatment, resulting in high strength and good toughness. It is fitted inside the connecting sleeve 1, and one or more slotted annular pressure distribution rings 2 are provided between the outer wall of the central sleeve 3 and the inner wall of the connecting sleeve 1. (See [link to relevant documentation]). Figure 4 The force from the central sleeve 3 is first transmitted to the pressure ring, which then transmits the force to the support block 12 array through its slots. Finally, the support blocks 12 transmit the force to the connecting sleeve 1. This is equivalent to adding a pressure diffusion layer between the central sleeve 3 and the support blocks 12, making the load transmission path longer, smoother, and more uniform.

[0041] The length of the central sleeve 3 is greater than that of the connecting sleeve 1. One end of the central sleeve 3 and the steel bar tie rod 9 are locked with the first locking nut 4, and the other end of the central sleeve 3 and the connecting sleeve 1 are locked with the second locking nut 5. The central sleeve 3 and the steel bar tie rod 9 are locked with the third conical locking nut 6.

[0042] In this embodiment, the first and second locking nuts 5 are high-strength, large-contact-surface bearing nuts. The contact surfaces with the central sleeve 3 and the connecting sleeve 1 should be precision machined to ensure flatness. The taper design of the third tapered locking nut 6 precisely matches the taper of the reinforcing bar tie rod 9 to ensure stable clamping and reasonable stress distribution. All thread roots adopt a large-radius fillet design to reduce fatigue sources.

[0043] In this embodiment, a gasket 7 is provided on the surface of the pressure equalizing annular surface 11, which can play the role of micro-leveling, absorbing minor impacts, and uniformly distributing contact pressure.

[0044] Please see Figure 1 and 5 A composite cover plate 8 is provided at the other end of the concrete layer or steel beam layer. The composite cover plate 8 is a cylindrical body 82 with a circular plate 81 at the end. A through hole for the steel tie rod 9 to pass through is provided in the middle of the composite cover plate 8. The circular plate 81 and the pressure equalizing annular surface 11 of the composite cover plate 8 respectively bear the upper and lower end faces of the steel beam to be assembled.

[0045] The circular plate 81 has an inner ring-shaped thin steel plate 811, with the thin steel plate 811 embedded inside. The outer layer of the thin steel plate 811 is a rubber layer 812, which improves compressive stiffness and disperses stress. The steel plate surface has openings and serrated edges to enhance the vulcanization bond strength with the rubber and prevent interlayer delamination.

[0046] In this embodiment, the main rubber component is a blend of high-damping natural rubber and neoprene rubber in a ratio of 70:30, with carbon nanotubes added to enhance tear resistance. Additionally, ozone inhibitors and UV absorbers are added to extend outdoor lifespan.

[0047] Furthermore, a hot-pressed composite polyurethane or ultra-high molecular weight polyethylene wear-resistant layer 813 can be provided on the bottom surface of the circular plate 81 to reduce frictional loss. A fan-shaped reinforcing rib is added at the connection between the cylinder and the circular plate 81, with a gradually changing thickness, thicker at the root and thinner at the end, to disperse bending stress.

[0048] The inner wall of the through hole of the cylindrical body 82 is provided with two sealing lips 821. The sealing lips 821 are made of hydrogenated nitrile rubber, forming a double-level sealing barrier to adapt to micro-vibrations. A stainless steel spring ring 822 is embedded at the root of the sealing lip 821 to provide continuous clamping force to compensate for wear.

[0049] The side wall of the cylindrical body 82 is designed with an "inwardly concave corrugated" shape, which produces pre-compression deformation after installation to enhance the initial sealing performance.

[0050] In summary, this utility model improves the overall load-bearing capacity and stiffness by increasing the number and strength of reinforcing beams 13, increasing the number of support blocks 12 and optimizing their cross-sections, using ultra-high strength materials and heat treatment, and optimizing the contact of the locking nuts. The support blocks 12 are optimized as a key pressure equalization layer, an intermediate pressure ring is introduced, and overall symmetry and manufacturing precision are ensured, constructing a more effective and reliable multi-stage pressure transmission path. Strict adherence to large rounded corner transitions, surface strengthening treatment, reliable nut anti-loosening measures, optimized conical surface fit and protection, selection of high-purity materials, rigorous non-destructive testing, and protection against fretting fatigue are implemented.

[0051] This specification describes examples of embodiments of the present invention, but does not imply that these embodiments illustrate and describe all possible forms of the present invention. It should be understood that the embodiments in the specification can be implemented in various alternative forms. The drawings are not necessarily drawn to scale; some features may be enlarged or reduced to show details of specific components. The specific structural and functional details disclosed should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to implement the present invention in various forms. Those skilled in the art will understand that multiple features illustrated and described with reference to any of the drawings can be combined with features illustrated in one or more other drawings to form embodiments not explicitly illustrated or described. The illustrated combinations of features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the present invention may be used as needed for specific applications or implementations.

[0052] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A large-tonnage, multi-stage equalizing pressure, fatigue-resistant prestressed anchor, characterized in that, include: A connecting sleeve is provided, wherein the upper and lower end faces of the connecting sleeve extend into pressure-equalizing annular surfaces, and a plurality of support blocks are evenly distributed in a circular array along the side wall of the connecting sleeve between the two pressure-equalizing annular surfaces. At least two pairs of symmetrically distributed reinforcing beams with "I"-shaped cross sections extend radially from the outer edge of the support blocks, wherein the top and bottom surfaces of the reinforcing beams are coplanar with the pressure-equalizing annular surfaces. A central sleeve is fitted inside the connecting sleeve. The length of the central sleeve is greater than that of the connecting sleeve. One end of the central sleeve and the reinforcing bar tie rod are locked with a first locking nut, and the other end of the central sleeve and the connecting sleeve are locked with a second locking nut. A third conical locking nut is used to lock the central sleeve and the reinforcing bar tie rod.

2. The large-tonnage multi-stage equalizing pressure fatigue-resistant prestressed anchorage according to claim 1, characterized in that, The support blocks are provided in 8-12 units, and the support blocks have a structure that is wide and thick at both ends and thins in the middle.

3. The large-tonnage multi-stage equalizing pressure fatigue-resistant prestressed anchorage according to claim 1, characterized in that, The reinforcing beam and the annular surface are rounded at the transition, and the flange of the reinforcing beam is rounded at the connection with the web.

4. The large-tonnage multi-stage equalizing pressure fatigue-resistant prestressed anchorage according to claim 1, characterized in that, One or more slotted annular pressure distribution rings are provided between the outer wall of the central sleeve and the inner wall of the connecting sleeve.

5. The large-tonnage multi-stage equalizing pressure fatigue-resistant prestressed anchorage according to claim 1, characterized in that, The surface of the pressure-equalizing annular surface is provided with a gasket.

6. The large-tonnage multi-stage equalizing pressure fatigue-resistant prestressed anchorage according to any one of claims 1-5, characterized in that, The anchor also includes a composite cover plate, which is a cylindrical body with a circular plate at one end. The middle of the composite cover plate is provided with a through hole for the steel tie rod to pass through. The circular plate of the composite cover plate and the pressure equalizing annular surface respectively bear pressure on the upper and lower end faces of the steel beam to be assembled.

7. The large-tonnage multi-stage equalizing pressure fatigue-resistant prestressed anchorage according to claim 6, characterized in that, The interior of the circular plate is a ring-shaped thin steel plate with holes on its surface and serrated edges; the exterior of the thin steel plate is a rubber layer.

8. The large-tonnage multi-stage equalizing pressure fatigue-resistant prestressed anchorage according to claim 6, characterized in that, The inner wall of the through hole of the cylindrical body is provided with two sealing lips, which are made of hydrogenated nitrile rubber.

9. The large-tonnage multi-stage equalizing pressure fatigue-resistant prestressed anchorage according to claim 8, characterized in that, A stainless steel spring ring is pre-embedded at the root of the sealing lip.

Images