High-fatigue inhaul cable anchored in hot and cold grading mode

Abstract

The high-fatigue inhaul cable comprises an anchor cup, a wire dividing plate, a cable body, a cold casting anchoring material and a hot casting anchoring material, the anchor cup adopts a cold and hot grading anchoring mode, a hot casting anchor is arranged at the front end of the anchor cup, a cold casting anchor is arranged at the rear end of the anchor cup, and a hot casting anchor inner cavity and a cold casting anchor inner cavity which are different in taper are formed in the anchor cup. Wherein a hot casting anchoring material and a cold casting anchoring material which are different in strength and rigidity are poured into the hot casting anchor inner cavity and the cold casting anchor inner cavity respectively, so that a cable body steel wire is connected with the anchor cup in an anchoring mode, the effect of reducing the stress of the anchoring material and the steel wire at the front end of the anchor cup is achieved, and meanwhile on the premise that the inner cone angle of the anchor cup is not reduced, the steel wire break angle in the anchor cup is reduced; bending stress of the steel wires is reduced, and fatigue life of the inhaul cable is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridges, and in particular relates to a high fatigue cable with cold and hot graded anchoring. Background Art

[0002] At present, the cable body steel wire is mainly anchored in the anchor cup by hot cast anchor or cold cast anchor. When making the cable, the cable body steel wire passes through the conical inner cavity of the anchor cup, diverges through the wire dividing plate, and then is poured with cold cast or hot cast anchoring material to be anchored and connected with the anchor cup. When the cable is subjected to force, the tension of the cable body steel wire is transmitted from the front end to the rear end of the anchor cup. Therefore, the stress is mainly concentrated on the anchoring material at the front end of the anchor cup and the cable body steel wire, that is, the front anchoring material and steel wire of the anchor cup have stress concentration problems, and are prone to the risk of fatigue failure. At the same time, the inner cavity structure of the anchor cup is compact, and the steel wires are densely arranged, which is prone to problems such as uneven casting of anchoring materials and insufficient density, which affects the anchoring performance of the cable and causes major safety hazards to the bridge.

[0003] Existing improved technology 1, in Chinese patent CN216739278U, the anchor cup of the patent adopts a conical inner cavity with multiple levels of taper, which reduces the angle of the prestressed tendons in the anchor cup without reducing the cone angle in the anchor cup, making it difficult for the prestressed tendons to be damaged, thereby improving the fatigue life of the cable. However, the front anchor material and steel wire of the anchor cup still have stress concentration problems, and the problem of uniform force on the steel wire in the anchor cup is not solved, and there is still a risk of fatigue failure.

[0004] Existing improved technology 2, in Chinese patent CN102051856A, the anchor cup of the patent adopts a single conical inner cavity structure, and the cold cast anchoring material is poured at the 1 / 4 conical inner cavity at the front end of the anchor cup, and the hot cast anchoring material is poured at the 3 / 4 conical inner cavity at the rear end of the anchor cup. The cone slope of the inner cavity of the anchor cup is enlarged, that is, the taper is increased, so as to improve the anchoring performance of the anchoring material. This method has the following limitations: 1. The cold cast anchoring material is poured at the front end of the anchor cup, and the hot cast anchoring material is poured at the rear end. The cold cast anchoring material is an epoxy iron sand composite material with high rigidity and small plastic deformation, while the hot cast anchoring material is a zinc-copper alloy with low rigidity and large plastic deformation. The cold cast anchoring material at the front end cannot transfer the tension of the cable body to the hot cast anchoring material at the rear end through plastic deformation. The front anchoring material and the steel wire of the anchor cup still have stress concentration problems; 2. The inner cavity taper of the anchor cup increases, which increases the bending angle of the cable body steel wire in the anchor cup, which is easy to generate bending stress.

[0005] The information disclosed in the above background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as admitting or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0006] In view of the above shortcomings, the utility model provides a high fatigue cable with cold and hot graded anchoring, in which the anchor cup is provided with a cold cast anchor inner cavity and a hot cast anchor inner cavity with different tapers. The stress of the hot cast anchor material at the front end can be quickly and evenly transmitted to the rear end, thereby achieving the effect of reducing the stress of the anchor material and the steel wire at the front end of the anchor cup. At the same time, without reducing the inner cone angle of the anchor cup, the folding angle of the steel wire in the anchor cup can be reduced, thereby reducing the bending stress of the steel wire and improving the fatigue life of the cable.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A high fatigue cable with hot and cold graded anchoring, comprising an anchor cup, a wire dividing plate, a cable body, a cold cast anchoring material and a hot cast anchoring material, wherein the cable body is composed of prestressed tendons, a hot cast anchor inner cavity and a cold cast anchor inner cavity are arranged inside the anchor cup, and both the hot cast anchor inner cavity and the cold cast anchor inner cavity are conical structures, the prestressed tendons pass through the hot cast anchor inner cavity and the cold cast anchor inner cavity in sequence and are dispersedly fixed on the wire dividing plate, and the hot cast anchoring material and the cold cast anchoring material are respectively arranged in the hot cast anchor inner cavity and the cold cast anchor inner cavity.

[0009] When the cable is subjected to stress, the tension of the cable wire is transmitted from the front end to the rear end of the anchor cup, and the stress is mainly concentrated at the front end of the anchor cup. The hot-cast anchor material at the front end has the characteristics of small stiffness and large plastic deformation. The stress can be quickly and evenly transmitted to the rear end, thereby achieving the effect of reducing the stress concentration of the anchor material and steel wire at the front end of the anchor cup.

[0010] Specifically, the taper angle α of the inner cavity of the hot cast anchor is greater than the taper angle β of the inner cavity of the cold cast anchor.

[0011] Since the strength and hardness of cold cast anchoring materials are higher than those of hot cast anchoring materials, under the standard stress requirements, the recommended angle of the hot cast anchor cavity needs to be larger than that of the cold cast anchor cavity to achieve better anchoring. By setting the cone angle of the hot cast anchor cavity at the front end of the anchor cup to be larger than the cone angle of the cold cast anchor cavity at the rear end of the anchor cup, the anchoring function of the front end is strengthened, and the bending angle of the steel wire is reduced without reducing the anchoring function.

[0012] Specifically, the large opening end of the hot cast anchor inner cavity and the small opening end of the cold cast anchor inner cavity are interpenetratingly arranged, and the wire dividing plate is cooperatively installed at the large opening end of the cold cast anchor inner cavity.

[0013] Specifically, the wire dividing plate is provided with wire dividing holes, casting holes and petal-shaped notches. The wire dividing holes are arranged at even intervals and are used to disperse and position the prestressed tendons. The casting holes are located at the center of the wire dividing plate, and the petal-shaped notches are arranged on the outer circle of the wire dividing plate.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The anchor structure of this scheme adopts hot-cast anchor cavities and cold-cast anchor cavities with different tapers, in which the hot-cast anchor cavities and cold-cast anchor cavities are respectively poured with hot-cast anchor materials and cold-cast anchor materials with different strengths and stiffnesses, so that the cable body steel wire is anchored and connected with the anchor cup. When the cable is subjected to force, the tension of the cable body steel wire is transmitted from the front end to the rear end of the anchor cup, and the stress is mainly concentrated at the front end of the anchor cup. The hot-cast anchor material at the front end has the characteristics of low stiffness and large plastic deformation. The stress can be quickly and evenly transmitted to the rear end, achieving the effect of reducing the stress concentration of the anchor material and steel wire at the front end of the anchor cup.

[0016] 2. This scheme adopts a two-stage inner cavity structure with different tapers, which can make the bending angle of the cable wire in the anchor cup smaller without reducing the inner cone angle of the anchor cup, reduce the bending stress of the steel wire in the anchor cup, and improve the fatigue life of the cable.

[0017] 3. The wire dividing plate of this scheme is provided with petal-shaped notches and casting hole structures, which can not only meet the positioning and divergent wire division of the cable body steel wire, but also improve the uniformity and density of the poured cold cast anchor material and hot cast anchor material, and improve the anchoring performance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the high fatigue cable structure of the utility model with cold and hot graded anchoring.

[0019] Figure 2 This is a schematic diagram of the anchor cup structure of the utility model.

[0020] Figure 3 It is a schematic diagram of the structure of the wire dividing plate of the utility model.

[0021] In the figure, 1-anchor cup; 11-rear end inner cavity; 12-cold cast anchor inner cavity; 13-hot cast anchor inner cavity; 14-front end inner cavity; 2-wire dividing plate; 21-wire dividing hole; 22-casting hole; 23-petal-shaped notch; 3-cable body; 31-prestressed tendon; 4-cold cast anchor material; 5-hot cast anchor material. DETAILED DESCRIPTION

[0022] In order to explain the technical content, purpose and effect of the utility model in detail, the following is explained in combination with the embodiments and the accompanying drawings. In the description of this embodiment, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the utility model.

[0023] This embodiment discloses a high fatigue cable with cold and hot graded anchoring, referring to Figure 1 As shown, it includes a cable body 3, an anchor cup 1 and a wire dividing plate 2, wherein the cable body 3 is composed of prestressed tendons 31.

[0024] refer to Figure 2 As shown in the anchor cup, a hot cast anchor inner cavity 13 and a cold cast anchor inner cavity 12 are arranged inside the anchor cup 1. The hot cast anchor inner cavity 13 and the cold cast anchor inner cavity 12 are both conical structures. The large end of the hot cast anchor inner cavity 13 and the small end of the cold cast anchor inner cavity 12 are arranged to penetrate each other. The front end of the anchor cup 1 is provided with a front end inner cavity 14 connected with the small end of the hot cast anchor inner cavity 13, which is used to fix the cable body 1 through a sealing ring; the rear end of the anchor cup 1 is provided with a rear end inner cavity 11 connected with the large end of the cold cast anchor inner cavity 12, which is used to provide a channel for the wire dividing plate 2 to be installed to the large end of the cold cast anchor inner cavity 12, as well as a channel for subsequent filling.

[0025] When making the cable, the prestressed tendons 31 of the cable body 3 pass through the conical inner cavity of the anchor cup 1 from the front end of the anchor cup 1 in sequence, and after diverging through the wire dividing plate 2, the hot cast anchor material 5 and the cold cast anchor material 4 are respectively poured into the hot cast anchor inner cavity 13 and the cold cast anchor inner cavity 12. The hot cast anchor material 5 can be made of zinc-copper alloy, and the cold cast anchor material 4 can be made of a mixture of epoxy resin and steel shots. The prestressed tendons 31 are anchored in the anchor cup 1 through the hot cast anchor material 5 and the cold cast anchor material 4.

[0026] This embodiment adopts a hot and cold graded anchoring form through the structure, with the front end being a hot cast anchor and the rear end being a cold cast anchor. The hot cast anchor inner cavity 13 and the cold cast anchor inner cavity 12 are respectively poured with hot cast anchoring materials 4 and cold cast anchoring materials 5 of different strengths and stiffnesses, so that the prestressed tendon 31 is anchored and connected with the anchor cup 1. During the stress process, the tension of the cable body steel wire 31 is transmitted from the front end to the rear end of the anchor cup 1, and the stress is mainly concentrated at the front end of the anchor cup 1. The hot cast anchoring material 4 at the front end has the characteristics of small stiffness and large plastic deformation, and the stress can be quickly and evenly transmitted to the rear end, so as to achieve the effect of reducing the stress concentration of the anchoring material and steel wire at the front end of the anchor cup 1, and thus achieve the purpose of this embodiment.

[0027] As a preferred technical solution of this embodiment, the taper angle α of the hot cast anchor cavity 13 is greater than the taper angle β of the cold cast anchor cavity 12. The hot cast anchor cavity 13 and the cold cast anchor cavity 12 with different tapers are provided in the anchor cup 1, which solves the problem that the overall taper of the anchor cavity is reduced due to the increase in the anchoring length, thereby affecting the anchoring reliability of the cable wire bundle. For a long-span cable-stayed bridge, the prestressed tendons 31 can have a smaller fold angle than the prior art under the cable made of the prestressed tendons 31 with higher strength.

[0028] As a preferred technical solution of this embodiment, the large end of the hot cast anchor inner cavity 13 is connected to the small end of the cold cast anchor inner cavity 12 by setting a step in the hole, and the maximum inner diameter of the hot cast anchor inner cavity 13 is greater than the maximum inner diameter of the cold cast anchor inner cavity 12. The length and taper of the two cavities can be calculated to reach the optimal value through different cable stress requirements.

[0029] refer to Figure 3The wire dividing plate shown in the figure has the wire dividing plate 2 installed in cooperation with the large end of the inner cavity 12 of the cold cast anchor, and the prestressed tendons 31 are dispersedly fixed on the wire dividing plate 2. The wire dividing plate 2 is provided with wire dividing holes 21, casting holes 22 and petal-shaped notches 23. The wire dividing holes 2 are arranged at even intervals for dispersing and positioning the prestressed tendons 31. The casting hole 22 is located at the center of the wire dividing plate 2, and the petal-shaped notches 23 are arranged on the outer circle of the wire dividing plate 2.

[0030] The specific steps of the method for manufacturing the high fatigue cable with hot and cold graded anchoring in this embodiment are as follows.

[0031] 1: Processing the wire dividing plate 2 and anchor cup 1 of the cable;

[0032] 2: Making the cable body 3 of the cable;

[0033] 3: After the cable body 3, anchor cup 1, hot cast anchor material 5, cold cast anchor material 4 and wire dividing plate 2 are ready, the prestressed tendons 31 of the cable body 3 are sequentially inserted into the front end inner cavity 14 of the anchor cup 1, the hot cast anchor inner cavity 13, the cold cast anchor inner cavity 12 and the wire dividing plate 2. After each prestressed tendon 31 is inserted into the wire dividing plate 2 for divergence and positioning, part of the prestressed tendons 31 are headed, and the wire dividing plate 2 is installed on the large end of the cold cast anchor inner cavity 12 through the rear end inner cavity 11;

[0034] 4: Casting of hot cast anchor: Use special tooling to ensure that the cable body 3 of the cable is perpendicular to the anchor cup 1, preheat the cable anchor, and then pour high-temperature hot cast anchor material 5 into the hot cast anchor cavity 13 from the rear end of the anchor cup 1; let it stand until the hot cast anchor material 5 solidifies;

[0035] 5: Casting of cold cast anchor: pour the prepared cold cast anchor material 4 from the rear end of the anchor cup 1 into the inner cavity 12 of the cold cast anchor, and vibrate to make the inner cavity evenly filled with the cold cast anchor material 4; after pouring, solidify the cold cast anchor.

[0036] 6: Carry out top pressure test or super tension test as required.

[0037] Although the present invention has been described in detail above with specific implementation methods, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A high fatigue cable with hot and cold graded anchoring, characterized in that: The invention comprises an anchor cup (1), a wire dividing plate (2), a cable body (3), a cold cast anchor material (4) and a hot cast anchor material (5); the cable body (3) is composed of a prestressed tendon (31); a hot cast anchor inner cavity (13) and a cold cast anchor inner cavity (12) are arranged inside the anchor cup (1); the hot cast anchor inner cavity (13) and the cold cast anchor inner cavity (12) are both conical structures; the prestressed tendon (31) passes through the hot cast anchor inner cavity (13) and the cold cast anchor inner cavity (12) in sequence and is dispersedly fixed on the wire dividing plate (2); the hot cast anchor material (5) and the cold cast anchor material (4) are respectively arranged in the hot cast anchor inner cavity (13) and the cold cast anchor inner cavity (12).

2. The high fatigue cable with cold and hot graded anchoring according to claim 1 is characterized by: The cone angle α of the hot cast anchor inner cavity (13) is greater than the cone angle β of the cold cast anchor inner cavity (12).

3. The high fatigue cable with cold and hot graded anchoring according to claim 1 is characterized by: The large opening end of the hot cast anchor inner cavity (13) and the small opening end of the cold cast anchor inner cavity (12) are interpenetratingly arranged, and the wire dividing plate (2) is cooperatively mounted on the large opening end of the cold cast anchor inner cavity (12).

4. The high fatigue cable with cold and hot graded anchoring according to claim 1 is characterized in that: The wire dividing plate (2) is provided with a wire dividing hole (21), a casting hole (22) and a petal-shaped notch (23); the wire dividing holes (21) are arranged at even intervals and are used to disperse and position the prestressed tendons (31); the casting hole (22) is located at the center of the wire dividing plate (2); and the petal-shaped notch (23) is arranged on the outer circle of the wire dividing plate (2).

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