Stay cable beam end protection structure

Abstract

The utility model provides a stay cable beam end protection structure. The stay cable beam end protection structure comprises a cable body, a cable guide pipe, a sheath, a polyurethane foaming material, a waterproof cover and non-drying sealant. The cable body is sleeved with the cable guide pipe; the cable guide pipe is sleeved with the sheath. The polyurethane foaming material is filled in a gap between the sheath and the cable conduit; one end of the waterproof cover is sleeved on the cable guide pipe, the other end of the waterproof cover is sleeved on the sheath, and the waterproof cover is welded on the sheath; and the non-drying sealant is filled in a gap between the sheath and the cable conduit and is positioned at one end, close to the waterproof cover, of the polyurethane foaming material. The non-drying sealant has good flowability and relatively strong adhesion, can keep stable sealing performance under long-term vibration of a cable body, and is not easy to crack, so that long-term omnibearing isolation and protection of the interior of the cable conduit are realized; and the waterproof cover and the sheath are integrally welded, so that the bonding performance of the welding part under the vibration of the cable body and the external force is remarkably improved, and the protection performance of the structure is further improved.

Description

Technical Field

[0001] This utility model relates to the field of cable-stayed beam end protection technology, specifically to a cable-stayed beam end protection structure. Background Technology

[0002] As a key load-bearing component of long-span bridges, cable-stayed cables face the primary challenge of environmental corrosion, which can severely lead to component failure and significantly shorten the bridge's service life. Early-built bridges have gradually revealed corrosion of the steel wires inside and around the lower anchor heads, mainly caused by rainwater intruding through the cable ducts or PE sheaths. Therefore, establishing an effective protective system at the cable-stayed beam ends is crucial for extending the bridge's service life.

[0003] Currently, the design of protective systems for cable-stayed bridge ends typically involves installing a waterproof cover at the end of the cable guide tube and filling it with polyurethane foam to achieve waterproofing and sealing. Commonly used waterproof covers include rubber, cast iron, and stainless steel covers. Rubber covers suffer from low durability; cast iron and stainless steel covers are prone to bolt loosening during use, leading to gaps at the contact point between the cover and the cable's PE sheath, affecting their sealing performance. The polyurethane foam filling inside the cable guide tube has high hardness and is prone to cracking under long-term cable vibration, providing channels for rainwater infiltration and potentially causing protection failure in the anchor head area. Furthermore, the porous structure of this material means that once rainwater seeps in, it remains trapped in the internal voids, causing long-term and continuous corrosion to the steel structure of the cable guide tube and the anchor head area below the cable, further weakening the structure's durability and safety. Therefore, a low-cost and simple protective method is urgently needed. Utility Model Content

[0004] In view of the above-mentioned problems in the existing technology, the technical problem to be solved by this utility model is: how to prevent rainwater from entering the cable conduit.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a cable-stayed beam end protection structure, comprising:

[0006] Cable body;

[0007] A cable guide tube is fitted onto the cable body;

[0008] A sheath is fitted over the cable guide tube;

[0009] Polyurethane foam material is used to fill the gap between the sheath and the cable guide.

[0010] A waterproof cover, one end of which is fitted onto the cable guide tube, and the other end of which is fitted onto the sheath, and the waterproof cover is welded to the sheath; and

[0011] A non-drying sealant is used to fill the gap between the sheath and the cable guide, and is located at the end of the polyurethane foam material near the waterproof cover.

[0012] Preferably, the sheath and waterproof cover are made of HDPE.

[0013] Preferably, it also includes a liquid waterstop; the liquid waterstop fills the gap between the sheath and the cable guide, and is located on the side of the non-drying sealant away from the polyurethane foam material.

[0014] Preferably, a rubber shock absorber is installed in the gap between the sheath and the cable guide, and the rubber shock absorber is located on the side of the liquid waterstop away from the polyurethane foam material.

[0015] Preferably, the waterproof cover includes: a conical portion, a first sleeve portion and a second sleeve portion; the first sleeve portion and the second sleeve portion are respectively installed at both ends of the conical portion; the first sleeve portion is sleeved on the sheath and the second sleeve portion is sleeved on the cable guide.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] 1. In this utility model, a non-drying sealant is injected onto the upper surface of the polyurethane foam material inside the cable conduit. This non-drying sealant has good fluidity and strong adhesion, and can maintain stable sealing performance under long-term vibration of the cable body, making it less prone to cracking, thereby achieving long-term all-round isolation and protection of the inside of the cable conduit.

[0018] 2. In this utility model, the integrated welding design between the waterproof cover and the sheath significantly improves the bonding performance of the welded part under the vibration of the cable body and the action of external forces, thereby giving the waterproof cover excellent reliability and durability, effectively preventing rainwater from seeping into the cable guide tube, and further improving the protective performance of the structure.

[0019] 3. In this invention, a liquid waterstop is applied on top of the non-drying sealant, thereby forming a flexible water-proof barrier between the cable guide tube and the sheath. The liquid waterstop has excellent aging resistance and water immersion resistance, exhibiting high stability and maintaining good elasticity under harsh environments and long-term vibration of the cable body, ensuring the water-proof sealing effect of the cable guide tube port.

[0020] 4. In this utility model, the middle section of the waterproof cover is set in a conical shape, which can effectively reduce the residence time of rainwater and further prevent rainwater from seeping in; and the first sleeve is fitted on the outside of the sheath, which can further prevent rainwater from seeping in, and can also increase the contact area between the first sleeve and the sheath, which facilitates the welding between the sheath and the first sleeve; the second sleeve is fitted on the cable guide, which increases the contact area between the cable guide and the cable guide, so as to further prevent rainwater from seeping in. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1 This is a schematic diagram of a cable-stayed beam end protection structure provided in an embodiment of this utility model.

[0023] Reference numerals: 1-Cable body, 2-Cable guide tube, 3-Sheath, 4-Polyurethane foam material, 5-Waterproof cover, 51-Conical part, 52-First socket part, 53-Second socket part, 6-Non-drying sealant, 7-Liquid waterstop, 8-Rubber shock absorber. Detailed Implementation

[0024] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0025] In this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 this utility model and simplifying the description, and are not intended to 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 this utility model.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] See Figure 1 The present invention provides an embodiment of a cable-stayed beam end protection structure, comprising: a cable body 1, a cable guide 2, a sheath 3, polyurethane foam material 4, a waterproof cover 5, and a non-drying sealant 6; the cable guide 2 is sleeved on the cable body 1; the sheath 3 is sleeved on the cable guide 2; the polyurethane foam material 4 fills the gap between the sheath 3 and the cable guide 2; one end of the waterproof cover 5 is sleeved on the cable guide 2, and the other end of the waterproof cover 5 is sleeved on the sheath 3, and the waterproof cover 5 is welded to the sheath 3; the non-drying sealant 6 fills the gap between the sheath 3 and the cable guide 2, and is located at the end of the polyurethane foam material 4 near the waterproof cover 5.

[0028] In specific implementation, a non-drying sealant 6 is injected into the upper surface of the polyurethane foam material 4 inside the cable conduit 2. This non-drying sealant 6 has good fluidity and strong adhesion, and can maintain stable sealing performance under long-term vibration of the cable body 1, and is not easy to crack, thereby achieving long-term all-round isolation and protection of the inside of the cable conduit 2. In addition, the integrated welding design between the waterproof cover 5 and the sheath 3 significantly improves the bonding performance of the welded part under the vibration of the cable body 1 and the action of external force, thereby giving the waterproof cover 5 excellent reliability and durability, effectively preventing rainwater from seeping into the inside of the cable conduit 2, and further improving the protective performance of the structure.

[0029] See Figure 1 In other embodiments, the sheath 3 and the waterproof cover 5 are made of HDPE. This makes it easier to weld and fuse the sheath 3 and the waterproof cover 5 together.

[0030] See Figure 1 In other embodiments, a liquid waterstop 7 is also included; the liquid waterstop 7 fills the gap between the sheath 3 and the cable guide 2, and is located on the side of the non-drying sealant 6 away from the polyurethane foam material 4; the liquid waterstop 7 is applied on top of the non-drying sealant 6, thereby forming a flexible water-proof barrier between the cable guide 2 and the sheath 3. The liquid waterstop 7 has excellent aging resistance and water immersion resistance, exhibits high stability, and can maintain good elasticity under harsh environments and long-term vibration of the cable body 1, ensuring the water-proof sealing effect of the cable guide 2 port.

[0031] See Figure 1 In other embodiments, a rubber shock absorber 8 is installed in the gap between the sheath 3 and the cable guide 2. The rubber shock absorber 8 is located on the side of the liquid stop 7 away from the polyurethane foam material 4. This effectively reduces vibration inside the sheath 3.

[0032] See Figure 1 In another embodiment, the waterproof cover 5 includes: a conical portion 51, a first sleeve portion 52 and a second sleeve portion 53; the first sleeve portion 52 and the second sleeve portion 53 are respectively installed at both ends of the conical portion 51; the first sleeve portion 52 is sleeved on the sheath 3 and the second sleeve portion 53 is sleeved on the cable guide 2.

[0033] In specific implementation, the middle section of the waterproof cover 5 is set into a cone shape, which can effectively reduce the residence time of rainwater and further prevent rainwater from seeping in; and the first sleeve part 52 is fitted on the outside of the sheath 3, which can further prevent rainwater from seeping in and also increase the contact area between the first sleeve part 52 and the sheath 3, making it easier to weld the sheath 3 and the first sleeve part 52; the second sleeve part 53 is fitted on the cable guide 2, thereby increasing the contact area between the cable guide 2 and the cable guide 2, so as to further prevent rainwater from seeping in.

[0034] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A cable-stayed beam end protection structure, characterized in that, include: Cable body; A cable guide tube is fitted onto the cable body; A sheath is fitted over the cable guide tube; Polyurethane foam material is used to fill the gap between the sheath and the cable guide. A waterproof cover, one end of which is fitted onto the cable guide tube, and the other end of which is fitted onto the sheath, and the waterproof cover is welded to the sheath; and A non-drying sealant is used to fill the gap between the sheath and the cable guide, and is located at the end of the polyurethane foam material near the waterproof cover.

2. The cable-stayed beam end protection structure according to claim 1, characterized in that, The sheath and waterproof cover are made of HDPE.

3. The cable-stayed beam end protection structure according to claim 1, characterized in that, It also includes a liquid waterstop; the liquid waterstop fills the gap between the sheath and the cable guide, and is located on the side of the non-drying sealant away from the polyurethane foam material.

4. The cable-stayed beam end protection structure according to claim 3, characterized in that, A rubber shock absorber is installed in the gap between the sheath and the cable guide, and the rubber shock absorber is located on the side of the liquid waterstop away from the polyurethane foam material.

5. The cable-stayed beam end protection structure according to claim 1, characterized in that, The waterproof cover includes: a conical part, a first sleeve part, and a second sleeve part; the first sleeve part and the second sleeve part are respectively installed at both ends of the conical part; the first sleeve part is sleeved on the sheath, and the second sleeve part is sleeved on the cable guide.

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