A stepped anti-slip pad and a stay cable saddle

Abstract

The present invention discloses a stepped anti-slip pad and a stay cable saddle, which are used for being cooperatively installed with the end of a wire dividing tube saddle. The pad includes steps having the same number as the number of layers of the wire dividing tubes. Each step is provided with a duct corresponding to the wire dividing tube, and the lengths of the prestressing tendon ducts formed by each wire dividing tube and its corresponding duct are equal. The stepped anti-slip pad and the stay cable saddle disclosed by the present invention compensate for the length difference between adjacent wire dividing tube layers through the stepped anti-slip pad, so that the lengths of the prestressing tendon ducts of each layer are the same, that is, the distances between the anti-slip keys at both ends of the prestressing tendons installed on the same saddle are the same. The prestressing tendons with anti-slip keys can be prefabricated in a factory. During on-site construction, the sizes and specifications of the prestressing tendons are the same, and they are not prone to being confused or making mistakes.

Description

Technical Field

[0001] The present invention relates to an anti-slip structure for a cable saddle of a cable-stayed bridge, and particularly to a stepped anti-slip cushion plate and a cable saddle of a stay cable. Background Art

[0002] At present, in order to prevent the wear of the steel strands of the stay cables inside the cable saddle, anti-slip keys are often installed at both ends of the steel strands and are respectively matched with the cushion plates at both ends of the cable saddle. Through a tensioning device for tensioning, the prestress of the steel strands inside the cable saddle is made greater than the prestress of the steel strands outside the cable saddle. In this way, during the vibration of the stay cables, the steel strands inside the cable saddle are in a static state and the steel strands will not be worn. However, due to the structure of the cable saddle having a certain curvature and the lengths of each layer of wire dividing pipes being different, therefore, the anti-slip keys on each steel strand need to be processed and manufactured according to the shape of the cable saddle and the specific installation position on site, and the distances between the anti-slip keys at both ends of each steel strand need to be customized differently, resulting in multiple sizes for one stay cable and being very prone to confusion and errors during construction.

[0003] In the prior art, Chinese Patent CN109778698A discloses a cable saddle of a cable-stayed bridge with an anti-slip key device, which includes a connecting piece, a protection cylinder, an anti-slip key device, a cable saddle, and a stay cable composed of multiple steel strands. The cable saddle is connected to the protection cylinder through the connecting piece, the anti-slip key device is installed inside the protection cylinder, the anti-slip key device is composed of a first anti-slip pressing plate, an open-type anti-slip key, and a second anti-slip pressing plate. The first anti-slip pressing plate and the second anti-slip pressing plate are provided with through holes for passing the steel strands. A notch is provided along the pipe wall of the open-type anti-slip key, and the steel strands are placed inside the open-type anti-slip key through the notch, and the two ends of the open-type anti-slip key are locked and limited by the first anti-slip pressing plate and the second anti-slip pressing plate. In this prior art, anti-slip keys are provided at the end faces of both ends of the cable saddle for each steel strand, and the anti-slip keys are matched with the cushion plates at both ends of the cable saddle to achieve the anti-slip effect. However, the cushion plates at both ends of the cable saddle are both flat structures, resulting in different distances between the anti-slip keys at both ends of each steel strand and needing to be customized differently. Summary of the Invention

[0004] In view of the above problems, the present invention provides a stepped anti-slip cushion plate and a cable saddle of a stay cable, aiming to solve the problems such as different distances between the anti-slip keys at both ends of each steel strand caused by the existing anti-slip structure, the need for different customizations, and being prone to confusion and errors during construction.

[0005] The present invention adopts the following technical solutions to achieve the above object:

[0006] A stepped anti-slip cushion plate is used for being cooperatively installed with the end of a wire dividing pipe cable saddle. The cushion plate includes steps having the same number as the number of layers of the wire dividing pipes. Each layer of the steps is provided with a hole channel corresponding to the wire dividing pipe, and the length of the prestressed tendon channel formed by each wire dividing pipe and its corresponding hole channel is equal.

[0007] The stepped anti-skid pad in the present technical solution is installed at the end of the saddle, and the anti-skid system includes two technical solutions: first, the two ends of the saddle respectively include a stepped anti-skid pad and a conventional pad (that is, a pad with flat end surfaces). In this solution, the height difference between adjacent steps of the stepped anti-skid pad is the length difference between the two layers of wire tubes matched with the above steps, so that the length of the prestressed tendon pipeline formed by each wire tube and its corresponding channel is equal; second, the two ends of the saddle respectively include a first stepped anti-skid pad and a second stepped anti-skid pad. In this solution, the sizes of the two stepped anti-skid pads can be the same or different. Similarly, the sum of the height difference of adjacent steps of the first stepped anti-skid pad and the height difference of adjacent steps corresponding to the second stepped anti-skid pad is equal to the length difference of the corresponding two layers of wire branching tubes. Similarly, the length of the prestressed tendon pipeline formed by each wire branching tube and its corresponding channel can be equal; the above scheme can compensate for the length of adjacent wire branching tube layers so that the length of each layer of prestressed tendon pipeline is the same, that is, the spacing between the anti-skid keys at both ends of the prestressed tendons installed on the same saddle is the same, and the prestressed tendons with anti-skid keys can be prefabricated in the factory. During on-site construction, the size and specifications of the prestressed tendons are the same, which is not easy to be confused or make mistakes.

[0008] A further technical solution is that the pad is an integral structure.

[0009] A cable saddle comprises at least one of the above-mentioned stepped anti-skid pads, and also comprises prestressed tendons and wire distribution tubes; the prestressed tendons are passed through the prestressed tendon pipes, and the prestressed tendons are provided with anchoring structures at both ends of the prestressed tendon pipes.

[0010] In the technical solution, prestressed tendon anchoring structures are arranged at both ends of the prestressed tendon pipeline, and the prestressed tendon cable force F1 in the prestressed tendon pipeline is made greater than the cable forces F2 and F3 at both ends outside the prestressed tendon pipeline by a tensioning device. When the cable force F1 in the prestressed tendon pipeline reaches the target force, the anchoring structures at both ends are used for anchoring to maintain the state of F1>F2 / F3. When the cable force F2 / F3 changes, F1 remains unchanged, and the prestressed tendons in the prestressed tendon pipeline will never slip relatively, thereby achieving the purpose of higher anti-slip force (greater than the designed cable force) and zero wear.

[0011] A further technical solution is that the anchoring structure includes an anti-slip key fixed on the prestressed tendon, a threaded sleeve threadedly connected to the outer ring of the anti-slip key, and the threaded sleeve is clamped on the outer end of the anti-slip pad channel.

[0012] In this technical solution, a prefabricated anti-slip key is consolidation on the prestressed tendon. The anti-slip key is a hollow cylindrical body, which is formed by cold extrusion of metal components through mechanical equipment. The anchoring force between the anti-slip key and the prestressed tendon is not less than 50% of the breaking force of the prestressed tendon. The surface of the consolidation anti-slip key is designed with external threads. The prestressed tendon will stretch after tensioning. After reaching the target cable force, the threaded sleeve is clamped on the end face of the saddle by adjusting the thread to adjust and lock, so as to keep the prestressed tendon cable force in the channel unchanged. The anchoring structure in this technical solution can realize cable force adjustment during construction or application. Among them, the anti-slip system can be an anchoring structure with cable force adjustment at one end, and the other end is an anchoring structure in the following technical solution or a conventional anchoring structure such as a clip and a tapered hole, or both ends can be anchoring structures with cable force adjustment. In addition, the outer diameter of the anti-slip key is smaller than the inner diameter of the anti-slip pad channel, which can meet the requirements of prefabrication of prestressed tendons in the factory and facilitate on-site installation and tensioning.

[0013] A further technical solution is that the anchoring structure includes an anti-slip key and a gasket fixed on the prestressed tendon; the gasket is provided with a through hole for penetrating the prestressed tendon, the first end face of the gasket is clamped to the outer end of the anti-slip pad channel, and the end face of the anti-slip key is clamped to the second end face of the gasket.

[0014] In the present technical scheme, the method in the above technical scheme can be used to fix the anti-slip key on the prestressed tendon. After the prestressed tendon is stretched to reach the target cable tension after being tensioned, the gap between the anti-slip key and the stepped anti-slip pad caused by the elongation of the prestressed tendon is filled with a gasket. In addition, the outer diameter of the anti-slip key is smaller than the inner diameter of the anti-slip pad hole, which can meet the requirements of prefabrication of the prestressed tendon in the factory and facilitate on-site penetration, tensioning and other construction.

[0015] The beneficial effects of the present invention are:

[0016] 1. The length difference of adjacent wire pipe layers is compensated by stepped anti-slip pads, so that the length of each layer of prestressed tendon pipes is the same, that is, the spacing between the anti-slip keys at both ends of the prestressed tendons installed on the same saddle is the same. The prestressed tendons with anti-slip keys can be prefabricated in the factory. During on-site construction, the size and specifications of the prestressed tendons are the same, which is not easy to be confused or make mistakes.

[0017] 2. The adjustable anchoring structure can realize the adjustment of cable force during the construction or application process.

[0018] 3. The prestressed tendons in the prestressed tendon pipeline will never slide relative to each other, thus achieving higher anti-slip force and zero wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 : A schematic structural diagram of the first stepped anti-slip pad of the present invention.

[0020] Figure 2 It is: the sectional view of the first stepped anti-slip pad of the present invention.

[0021] Figure 3 It is: the structural schematic diagram of the stay cable saddle of the present invention.

[0022] Figure 4 It is: the sectional view of the wire dividing tube of the present invention.

[0023] Figure 5 It is: the structural schematic diagram of the anchoring structure with threaded adjustment of the present invention.

[0024] Figure 6 It is: the structural schematic diagram of the anchoring structure with gasket ring of the present invention.

[0025] In the figure:

[0026] 11. The first stepped anti-slip pad; 12. The second stepped anti-slip pad; 101. The first layer of steps; 102. The second layer of steps; 103. The third layer of steps; 104. The fourth layer of steps; 105. The fifth layer of steps; 106. The sixth layer of steps; 107. The seventh layer of steps; 10. The duct; 2. The wire dividing tube; 201. The first layer of wire dividing tube; 202. The second layer of wire dividing tube; 203. The third layer of wire dividing tube; 204. The fourth layer of wire dividing tube; 205. The fifth layer of wire dividing tube; 206. The sixth layer of wire dividing tube; 207. The seventh layer of wire dividing tube; 31. The first anchor plate; 32. The second anchor plate; 4. The prestressed tendon; 51. The first anti-slip key; 52. The threaded sleeve; 61. The second anti-slip key; 62. The gasket ring. Specific embodiments

[0027] The following combines the attached Figures 1 to 6 The present invention will be described in detail. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0028] As Figures 1 to 2 shown, the present embodiment provides a stepped anti-slip pad for being cooperatively installed with the end of the wire dividing tube saddle. The pad is of an integral structure and includes steps having the same number as the number of layers of the wire dividing tube. A duct 10 corresponding to the wire dividing tube is provided on each layer of the steps, and the length of the prestressed tendon duct formed by each wire dividing tube and its corresponding duct is equal;

[0029] Specifically, taking the case where stepped anti-slip pads are used at both ends of the saddle as an example for description, as Figures 3 to 4As shown in the figure, the saddle includes a wire dividing pipe 2 embedded inside the cable tower, a first anchor plate 31 and a second anchor plate 32 located inside both sides of the cable tower, a first stepped anti-slip plate 11 and a second stepped anti-slip plate 12 located outside both sides of the cable tower. The first stepped anti-slip plate 11 and the second stepped anti-slip plate 12 have the same size and shape. The wire dividing pipe 2, from high to low (length from long to short), is successively the first-layer wire dividing pipe 201, the second-layer wire dividing pipe 202, the third-layer wire dividing pipe 203, the fourth-layer wire dividing pipe 204, the fifth-layer wire dividing pipe 205, the sixth-layer wire dividing pipe 206, and the seventh-layer wire dividing pipe 207. The first stepped anti-slip plate 11 and the second stepped anti-slip plate 12 are respectively provided with steps matching the above-mentioned wire dividing pipe layers. Taking the first stepped anti-slip plate 11 as an example, it includes the first step 101, the second step 102, the third step 103, the fourth step 104, the fifth step 105, the sixth step 106, and the seventh step 107 that match the above-mentioned wire dividing pipe layers from low to high. Each step is provided with a hole 10 matching the corresponding wire dividing pipe. Taking the height difference L between the second step 102 and the first step 101 as an example, the length difference between the first-layer wire dividing pipe 201 and the second-layer wire dividing pipe 202 is H. The first stepped anti-slip plate 11 and the second stepped anti-slip plate 12 have the same size and shape. Therefore, L = H / 2, so that the lengths of adjacent wire dividing pipe layers can be compensated, making the lengths of each layer of prestressed tendon ducts (wire dividing pipe + hole) the same; that is, the distances between the anti-slip keys at both ends of the prestressed tendon 4 installed on the same saddle are the same. The prestressed tendon 4 with anti-slip keys can be prefabricated in the factory. During on-site construction, the sizes and specifications of the prestressed tendons are the same, and they are not easy to be confused or make mistakes.

[0030] Each prestressed tendon 4 in the above-mentioned embodiment is provided with an anchoring structure at both ends of the prestressed tendon duct; as Figures 5 to 6 shown, the specific anchoring structure in this embodiment adopts the following method:

[0031] The anchoring structure of the first stepped anti-slip pad end includes a first anti-slip key 51 fixed on the prestressed tendon 4, a threaded sleeve 52 threadedly connected to the outer ring of the first anti-slip key 51, and the threaded sleeve 52 is clamped to the outer end of the anti-slip pad channel; the anchoring structure of the second stepped anti-slip pad end includes a second anti-slip key 61 fixed on the prestressed tendon 4, and a gasket 62, the gasket 62 is provided with a through hole for penetrating the prestressed tendon 4, and the first end face of the gasket 62 is clamped to the hole of the second stepped anti-slip pad 12 The outer end of the channel, the end face of the second anti-sliding key 61 is clamped to the second end face of the gasket 62, and the outer diameter of the second anti-sliding key 61 is smaller than the inner diameter of the channel of the second stepped anti-sliding pad 12; the first anti-sliding key 51 and the second anti-sliding key 61 are prefabricated and consolidated on the prestressed tendon 4, the above-mentioned anti-sliding key is a hollow cylindrical body, and the metal component is cold-extruded by mechanical equipment. The anchoring force between the above-mentioned anti-sliding key and the prestressed tendon 4 is not less than 50% of the breaking force of the prestressed tendon 4, and the surface of the first anti-sliding key 51 is designed with an external thread, and the prestressed tendon 4 is prefabricated with a first anti-sliding key 51. The stress tendon 4 will stretch after being tensioned. After reaching the target cable force, the threaded sleeve 52 is clamped on the outer end surface of the first stepped anti-skid pad 11 by adjusting the thread to adjust and lock it. At the same time, the gasket 62 is used to fill the gap between the second anti-skid key 61 and the outer end surface of the second stepped anti-skid pad 12 caused by the elongation of the prestressed tendon 4. The gasket 62 is a Haversian structure. The specific parameters such as thickness and quantity can be set according to actual working conditions to keep the cable force of the prestressed tendon 4 in the channel unchanged. The specific installation process is: through the tensioning device, the prestressed tendon cable force F1 in the prestressed tendon pipeline is made greater than the cable forces F2 and F3 at both ends outside the prestressed tendon pipeline. When the cable force F1 in the prestressed tendon pipeline reaches the target force, it is anchored with the anchoring structures at both ends to maintain the state of F1>F2 / F3. When the cable force F2 / F3 changes, F1 remains unchanged, and the prestressed tendons in the prestressed tendon pipeline will never have relative slippage, that is, a higher anti-skid force (greater than the designed cable force) and zero wear are achieved. In addition, the use of the above-mentioned adjustable anchoring structure can realize the adjustment of cable force during the construction process or the application process.

[0032] The saddle structure of two stepped anti-slip pads with the same size and shape is exemplarily shown in the above embodiments. In other embodiments or practical applications, a stepped anti-slip pad and a conventional pad (i.e., a pad with flat end faces) can also be used. In this embodiment, the height difference between adjacent steps of the stepped anti-slip pad is the length difference between two layers of wire dividing pipes that match the above steps, so that the length of the prestressed tendon duct formed by each wire dividing pipe and its corresponding duct is equal. Or two first stepped anti-slip pads 11 and second stepped anti-slip pads 12 with different sizes and shapes can also be used. The sum of the height differences between adjacent steps of the first stepped anti-slip pad 11 and the corresponding height differences between adjacent steps of the second stepped anti-slip pad 12 is equal to the length difference between the corresponding two layers of wire dividing pipes. Similarly, the length of the prestressed tendon duct formed by each wire dividing pipe and its corresponding duct can be made equal, that is, the effect of the above embodiment can be achieved. In addition, the integral pad structure of the above embodiment can also be a split structure. For example, each step is spliced to form a stepped anti-slip pad.

[0033] The above embodiments exemplarily show the specific anchoring structures at the ends of the first stepped anti-slip pad and the second stepped anti-slip pad. According to other embodiments or practical applications, the above anchoring structure including the first anti-slip key 51 and the threaded sleeve 52 can also be used at both ends, or the above anchoring structure including the second anti-slip key 61 and the gasket 62 can be used at both ends, or the anchoring structures such as clamping pieces and tapered holes in the prior art can be used.

[0034] A stepped anti-slip pad and a stay cable saddle provided by the present invention compensate for the length difference between adjacent wire dividing pipe layers through the stepped anti-slip pad, so that the length of each prestressed tendon duct is the same, that is, the distance between the anti-slip keys at both ends of the prestressed tendons installed on the same saddle is the same. The prestressed tendons with anti-slip keys can be prefabricated in the factory. During on-site construction, the sizes and specifications of the prestressed tendons are the same, and they are not easy to be confused or make mistakes; an adjustable anchoring structure is adopted, which can realize the cable force adjustment during the construction process or application process; the prestressed tendons in the prestressed tendon duct will never slip relative to each other, that is, the purpose of achieving a high anti-slip force and zero wear is achieved.

Claims

1. A stepped anti-skid pad, It is characterized in that Used to cooperate with the end of the wire dividing tube saddle for installation, the pad includes steps with the same number of wire dividing tube layers, each layer of the steps is provided with a channel corresponding to the wire dividing tube, and the length of the prestressed tendon pipe formed by each wire dividing tube and its corresponding channel is equal.

2. A stepped anti-slip pad according to claim 1, It is characterized in that The backing plate is an integral structure.

3. A stay cable saddle, Features It comprises at least one stepped anti-skid pad as described in claim 1, and also comprises prestressed tendons and wire branching tubes; the prestressed tendons are passed through the prestressed tendon pipes, and the prestressed tendons are provided with anchoring structures at both ends of the prestressed tendon pipes.

4. A stay cable saddle according to claim 3, It is characterized in that The anchoring structure includes an anti-sliding key fixed on the prestressed tendon and a threaded sleeve threadedly connected to the outer ring of the anti-sliding key. The threaded sleeve is clamped on the outer end of the anti-sliding pad channel. The outer diameter of the anti-sliding key is smaller than the inner diameter of the anti-sliding pad channel.

5. The cable saddle according to claim 3, It is characterized in that The anchoring structure includes an anti-slip key and a gasket fixed on the prestressed tendon; the gasket is provided with a through hole for penetrating the prestressed tendon, the first end face of the gasket is clamped on the outer end of the anti-slip pad channel, and the end face of the anti-slip key is clamped on the second end face of the gasket; the outer diameter of the anti-slip key is smaller than the inner diameter of the anti-slip pad channel.

Images