High-fatigue inhaul cable capable of stretching out and drawing back in large displacement mode

Abstract

The high-fatigue inhaul cable comprises a fork lug assembly and an inhaul cable body which are connected with each other, a shell comprising a cavity and an outlet is arranged between the fork lug assembly and the inhaul cable body, a telescopic device and a connecting rod are arranged in the cavity, the telescopic device is an elastic piece, and the connecting rod comprises a head portion and a rod portion. The maximum outer diameter of the head portion is larger than the maximum outer diameter of the rod portion and the maximum inner diameter of the outlet, the telescopic device is arranged between the head portion of the connecting rod and the outlet of the shell and connected to the outer side of the rod portion in a sleeving mode, and one end of the rod portion extends out of the outlet of the shell and then is connected with the inhaul cable. Various combinations suitable for the pulling force value and the deformation displacement of the inhaul cable can be configured, the requirements for various pulling force values and adjustable deformation of the inhaul cable are met, and the stress amplitude of the inhaul cable is improved on the premise that the anti-fatigue performance of the inhaul cable is not improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of suspension cables, in particular to a high fatigue cable structure with a large displacement and expansion amount. Background Art

[0002] Conventional cables usually use parallel steel wire bodies or steel strand bodies, and their two ends are anchored by fork ear assemblies and cable clamp ear plates, or by nut pressure-bearing methods, so that an integral force-bearing structure is formed between the cable and the cable clamp and the steel box girder. With the continuous innovation of bridge and building structural forms, as well as the influence of factors such as dynamic loads, wind loads and temperature effects, the overall force-bearing structure of bridges and buildings will undergo large displacement changes. The elastic modulus of the cable itself is large, and the deformation is small, which makes it difficult to meet the large displacement change requirements of the structure, resulting in fatigue failure. Therefore, there is an urgent need for a cable that can be extended and retracted with large displacements, which can adapt to the large displacement changes of the overall force-bearing structure of bridges and buildings through large displacement extension and retraction, and improve the fatigue performance of the cable.

[0003] In the prior art, a Chinese patent entitled "Large Telescopic Cable" (publication number CN107401119A, publication date 2017.11.28) provides a solution, including a cable body, two anchoring assemblies at both ends of the cable body, and a telescopic guide device composed of a pad, a telescopic member and a guide member, wherein the telescopic member is a disc spring group or an ordinary compression spring. The telescopic guide device is installed between the anchor nut and the anchor pad of the anchor assembly, the pad is close to one side of the anchor nut, and the cable is anchored on the pad by the anchor nut of the anchor assembly, that is, the telescopic guide device side needs to be anchored by the nut to achieve large telescopic deformation of the cable, the anchoring method has limitations, and the guide member has a complex structure and is difficult to install. Summary of the invention

[0004] The utility model aims to propose a high fatigue cable that can be extended and retracted with a large displacement. It is easy to install and has a simple guiding structure. Various combinations suitable for the cable tension value and the cable deformation displacement can be configured to meet the needs of various cable tension values ​​and adjustable deformation amounts. The stress amplitude of the cable is increased without improving the fatigue resistance of the cable itself.

[0005] In order to achieve the above objectives, the utility model adopts the following scheme:

[0006] A high fatigue cable capable of large displacement and extension, comprising a fork ear assembly and a cable connected to each other, wherein:

[0007] A shell including a cavity and an outlet is arranged between the fork ear assembly and the cable, and a telescopic device and a connecting rod are arranged in the cavity. The telescopic device is an elastic member, and the connecting rod includes a head and a rod. The maximum outer diameter of the head is greater than the maximum outer diameter of the rod and the maximum inner diameter of the outlet. The telescopic device is located between the head of the connecting rod and the outlet of the shell and is sleeved on the outside of the rod. One end of the rod extends out of the outlet of the shell and is connected to the cable.

[0008] As an option, the telescopic device is a cylindrical spring or a butterfly spring, and the inner diameter of the cylindrical spring or the butterfly spring is smaller than the maximum outer diameter of the head of the connecting rod but larger than the maximum outer diameter of the rod of the connecting rod.

[0009] As an option, a plurality of the butterfly springs are coaxially stacked or aligned.

[0010] As an option, the shell is a connecting sleeve threadedly connected to the fork ear assembly, the connecting sleeve includes an outer shell and a stepped through hole that passes through the two axial end faces of the outer shell along the axis of the outer shell to form a cavity, the stepped through hole corresponding to the hole at one end of the fork ear assembly is processed with an internal thread, and the stepped through hole corresponds to the hole at one end of the cable to form an outlet for the rod portion of the connecting rod to extend.

[0011] As another option, the housing is a part of the fork ear assembly, and a blind hole forming a cavity is opened on the end surface of the fork ear away from the fork ear of the fork ear assembly, and an internal thread is processed on the inner wall of the blind hole;

[0012] The outer side of the connecting rod is also sleeved with a connecting tube, the outer surface of the connecting tube is processed with an external thread, the inner hole of the connecting tube forms the outlet of the shell, and the connecting tube is connected to the internal thread of the blind hole through the external thread so that the telescopic device is located between the head of the connecting rod and the outlet.

[0013] As an option, the inner hole of the connecting cylinder is a tapered through hole, and the small inner diameter end of the tapered through hole is close to the telescopic device.

[0014] As an option, the outer surface of one end of the rod extending out of the outlet is processed with an external thread, and the rod is connected to the anchor at the end of the cable through the external thread.

[0015] Compared with the prior art, the utility model provides a high fatigue cable that can be extended and retracted with a large displacement. The extension device of the cable is located inside the connecting sleeve or the fork ear assembly, and is connected to the fork ear assembly at the upper end through the thread of the connecting sleeve or the thread of the connecting tube located on the connecting rod, and then connected to the cable anchor at the lower end through the thread on the connecting rod. The cable is then anchored to the cable clamp ear plate or the steel box girder through a pin (the connection method of the lower end of the cable is not drawn in the attached drawings of the specification, which generally adopts thread or pin connection, and the utility model selects pin connection), that is, the extension device side can realize anchor connection through the fork ear assembly, replacing the existing anchor nut and anchor pad structure. The utility model mainly meets the large displacement requirements of the bridge caused by load changes through the large displacement of the extension device, and improves the stress amplitude of the combined cable without improving the fatigue resistance of the cable itself, and the guide structure is simple and easy to install.

[0016] Compared with the prior art, the utility model has the following characteristics:

[0017] (1) The use of a telescopic device located between the fork ear assembly and the cable solves the problems of large displacement telescopic and high fatigue. The telescopic device is sleeved in the inner cavity formed by the connecting sleeve or the connecting tube and the fork ear assembly. The outer wall of the telescopic device is matched with the inner cylindrical surface of the connecting sleeve or the fork ear assembly, and the inner wall is matched with the outer cylinder of the connecting rod (that is, the outer diameter of the telescopic device is smaller than the inner diameter of the inner cylindrical surface of the connecting sleeve or the fork ear assembly, and the inner diameter of the telescopic device is larger than the outer diameter of the outer cylinder of the rod of the connecting rod). It plays a role in positioning and guiding the telescopic device. The telescopic device includes a disc spring combination or an ordinary spring assembly and has a large telescopic amount. The cable mainly meets the large displacement requirements of the bridge caused by load changes through the large displacement of the telescopic device. Under the premise of not improving the fatigue resistance of the cable itself, the stress amplitude of the combined cable is increased;

[0018] (2) The telescopic device is located inside the inner cavity formed by the connecting sleeve or the connecting tube and the fork ear assembly, and is connected to the fork ear assembly at the upper end through the thread of the connecting sleeve or the thread of the connecting tube on the connecting rod, and is also connected to the cable anchor at the lower end through the thread on the connecting rod. The cable is then connected to the cable clamp ear plate or the steel box girder through a pin. That is, the telescopic device side can be anchored through the fork ear assembly, and the guide structure is simple and easy to install.

[0019] (3) By selecting the telescopic device, including the selection of specifications, such as the number of overlapping or matching disc springs or the selection of the elastic force of the ordinary compression spring, various combinations suitable for the cable tension value and the cable deformation displacement can be configured to meet the needs of various cable tension values ​​and adjustable deformation amounts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the high fatigue cable capable of large displacement and extension designed in Example 1;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of the middle connecting sleeve and the connecting rod;

[0022] Figure 3 for Figure 1 Schematic diagram of the state of the high fatigue cable with large displacement and extension in the initial installation position, the position under constant load and the position under ultimate load respectively;

[0023] Figure 4 This is a schematic diagram of the structure of the high fatigue cable capable of large displacement and extension designed in Example 2;

[0024] Figure 5 for Figure 4 A schematic diagram of the structure of the middle connecting tube, the fork ear assembly and the connecting rod;

[0025] Figure 6 for Figure 4 Schematic diagram of the state of the high fatigue cable with large displacement and extension in the initial installation position, the position under constant load and the position under ultimate load respectively;

[0026] In the figure, 1. fork ear assembly, 11. inner cavity cylindrical surface, 2. connecting sleeve, 21. inner cavity cylinder, 22. inner cavity boss surface, 3. telescopic device, 4. connecting rod, 41. outer cylinder, 42. boss surface, 5. cable, 6. connecting tube, 61. upper end surface of connecting tube. DETAILED DESCRIPTION

[0027] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0028] Example 1

[0029] like Figure 1 , Figure 2 and Figure 3 As shown, a high fatigue cable capable of large displacement and expansion and contraction includes a fork ear assembly 1, a connecting sleeve 2, an expansion and contraction device 3, a connecting rod 4 and a cable 5. The expansion and contraction device 3 is installed in the inner cavity of the connecting sleeve 2, and the expansion and contraction device 3 includes a disc spring combination or a common spring assembly, and has a large expansion and contraction amount; the connecting rod 4 passes through the inner cavity of the connecting sleeve 2 and the inner hole of the expansion and contraction device 3 from the upper end, and the lower end is connected to the cable 5 anchor by a thread. The connecting sleeve 2 is connected to the external thread at one end of the fork ear assembly 1 by an internal thread, and the fork ear assembly 1 is connected to the ear plate by a pin shaft. The large deformation of the expansion and contraction device 3 realizes the large displacement change of the cable 5 under overload and no-stress conditions.

[0030] The inner cylinder 21 of the connecting sleeve 2 and the outer cylinder 41 of the connecting rod 4 are matched with the size of the telescopic device 3, that is, the upper end surface of the telescopic device 3 and the boss surface 42 of the connecting rod 4, and the lower end surface of the telescopic device 3 and the inner cavity boss surface 22 of the connecting sleeve 2 are matched and connected, so that the telescopic device 3 can be positioned and guided for telescopic movement. Figure 1 First, the telescopic device 3 and the connecting rod 4 are installed in the connecting sleeve 2 in a certain direction. The upper fork ear assembly 1 and the connecting sleeve 2 and the lower connecting rod 4 and the cable 5 are connected by threaded connection. The telescopic device 3 can reciprocate along the outer cylinder 41 of the connecting rod 4 and the inner cylinder 21 of the connecting sleeve 2. The deformation of the telescopic device 3 during loading is as follows: Figure 3 As shown, Figure 3 In the figure, h is the initial length of the telescopic device 3, f1 and f2 are different displacements, which are the initial installation position, the position at constant load (displacement f1) and the position at ultimate load (displacement f2) from left to right. The large deformation of the telescopic device 3 is used to realize the large displacement change of the cable 5. This high fatigue cable with large displacement telescopic function not only has a simple structure and is easy to install, but also meets the cable force design requirements. In addition, it can realize the high stress amplitude requirement of the cable 5 without increasing the cable force of the cable 5.

[0031] The installation and construction method of the above-mentioned high fatigue cable capable of large displacement and extension is as follows:

[0032] (1) Lubricating oil is evenly applied to the surface of the telescopic device 3;

[0033] (2) After the fork ear assembly 1, the connecting sleeve 2, the telescopic device 3, the connecting rod 4 and the cable 5 are ready, the telescopic device 3 is installed inside the connecting sleeve 2 in a certain order and combination, and the outer cylinder 41 of the connecting rod 4 is inserted into the disc spring assembly from the large end (internal thread) of the hole of the connecting sleeve 2 to the small end (exit) of the hole of the connecting sleeve 2, and is anchored and connected with the cable 5;

[0034] (3) The lower end of the fork ear assembly 1 is connected to the upper end of the connecting sleeve 2 through a thread, and the upper end of the fork ear assembly 1 is connected to the cable clamp ear plate through a pin;

[0035] (4) After installation, the telescopic device 3 should be pre-tightened to increase the service life of the telescopic device 3.

[0036] Example 2

[0037] like Figure 4 , Figure 5 and Figure 6As shown, another type of high fatigue cable capable of large displacement and expansion and contraction includes a fork ear assembly 1, a connecting tube 6, an expansion device 3, a connecting rod 4 and a cable 5. The expansion device 3 and the connecting rod 4 are located in the inner cavity of the fork ear assembly 1 (the blind hole on the end face of the fork ear assembly 1). The expansion device 3 includes a disc spring combination or a common spring assembly, and has a large expansion and contraction amount; the connecting tube 6 is sleeved on the outer cylinder 41 of the connecting rod 4, and the connecting tube 6 is connected to the inner cavity cylindrical surface 11 of the fork ear assembly 1 through a thread, so as to ensure that the connecting rod 4 can reciprocate up and down through the expansion device 3 and the inner hole of the connecting tube 6. The lower end of the connecting rod 4 is connected to the anchor of the cable 5 through a thread. The large deformation of the expansion device 3 realizes the large displacement change of the cable 5 under overload and no-stress conditions.

[0038] The inner cavity cylindrical surface 11 of the fork ear assembly 1, the outer cylinder 41 of the connecting rod 4 and the size of the telescopic device 3 are matched, that is, the upper end surface of the telescopic device 3 and the boss surface 42 of the connecting rod 4, and the lower end surface of the telescopic device 3 and the upper end surface 61 of the connecting tube are all matched and connected, so that the positioning and telescopic guidance of the telescopic device can be performed. During installation, the connecting rod 4 and the telescopic device 3 are first inserted into the inner cavity of the fork ear assembly 1 in a certain direction, and the connecting tube 6 is inserted on the surface of the outer cylinder 41 of the connecting rod 4 and connected to the inner cavity cylindrical surface 11 of the fork ear assembly 1 through threads. The outer cylinder 41 at the lower end of the connecting rod 4 is connected to the cable 5 through threaded anchoring. The telescopic device 3 can reciprocate along the outer cylinder 41 of the connecting rod 4 and the inner cavity cylindrical surface 11 of the fork ear assembly 1. The deformation of the telescopic device 3 during loading is shown as follows. Figure 6 As shown, Figure 6 In the figure, h is the initial length of the telescopic device 3, f1 and f2 are different displacements, from left to right, they are the initial installation position, the position under constant load (displacement f1), and the position under ultimate load (displacement f2). The large displacement of the cable 5 is achieved through the large deformation of the telescopic device 3. This high fatigue cable with large displacement is not only simple in structure and easy to install, but also meets the cable force design requirements. In addition, it can meet the high stress amplitude requirements of the cable 5 without increasing the cable force of the cable 5.

[0039] The specific installation and construction method of the above-mentioned high fatigue cable capable of large displacement and extension is as follows:

[0040] (1) The surface of the telescopic device 3 should be evenly coated with lubricating oil;

[0041] (2) After the fork ear assembly 1, the connecting tube 6, the telescopic device 3, the connecting rod 4 and the cable 5 are ready, the telescopic device 3 is mounted on the surface of the outer cylinder 41 of the connecting rod 4 in a certain order and combination, the connecting rod 4 and the telescopic device 3 are installed into the inner cavity of the fork ear assembly 1, and the connecting tube 6 passes through the outer cylinder 41 of the connecting rod 4;

[0042] (3) The connecting tube 6 is connected to the inner cylindrical surface 11 of the fork ear assembly 1 through a thread, and the lower end of the connecting rod 4 is anchored to the cable 5 through a thread, and it is necessary to ensure that the connecting rod 4 can reciprocate up and down through the telescopic device 3 and the inner hole of the connecting tube 6. That is, the lower end of the connecting rod 4 (the external thread of the rod) is anchored to the cable 5 through a thread, and the upper end of the fork ear assembly 1 is connected to the cable clamp ear plate through a pin shaft.

[0043] (4) After installation, the telescopic device 3 should be pre-tightened to increase the service life of the telescopic device 3.

[0044] Although the utility model has been described in detail above with specific implementation methods, it is obvious to those skilled in the art that modifications or improvements can be made based on the utility model. Therefore, modifications or improvements made without departing from the concept of the utility model belong to the scope of protection claimed by the utility model.

Claims

1. A high fatigue cable capable of large displacement and extension, comprising a fork ear assembly (1) and a cable (5) connected to each other, characterized in that: A shell including a cavity and an outlet is arranged between the fork ear assembly (1) and the cable (5), and a telescopic device (3) and a connecting rod (4) are arranged in the cavity. The telescopic device (3) is an elastic member, and the connecting rod (4) includes a head and a rod. The maximum outer diameter of the head is greater than the maximum outer diameter of the rod and the maximum inner diameter of the outlet. The telescopic device (3) is located between the head of the connecting rod (4) and the outlet of the shell and is sleeved on the outside of the rod. One end of the rod extends out of the outlet of the shell and is connected to the cable (5).

2. The high fatigue cable capable of large displacement and expansion according to claim 1, characterized in that: The telescopic device (3) is a cylindrical spring or a butterfly spring, and the inner diameter of the cylindrical spring or the butterfly spring is smaller than the maximum outer diameter of the head of the connecting rod (4) but larger than the maximum outer diameter of the rod of the connecting rod (4).

3. The high fatigue cable capable of large displacement and expansion according to claim 2, characterized in that: A plurality of butterfly springs are coaxially stacked or aligned.

4. The high fatigue cable capable of large displacement and expansion according to claim 1, characterized in that: The shell is a connecting sleeve (2) threadedly connected to the fork ear assembly (1), the connecting sleeve (2) comprising an outer shell and a stepped through hole extending through the two axial end faces of the outer shell along the axis of the outer shell to form a cavity, the stepped through hole corresponding to the hole at one end of the fork ear assembly (1) is processed with an internal thread, and the stepped through hole corresponding to the hole at one end of the cable (5) forms an outlet for the rod portion of the connecting rod (4) to extend.

5. The high fatigue cable capable of large displacement and expansion according to claim 1, characterized in that: The shell is a part of the fork ear assembly (1), and a blind hole forming a cavity is formed on the end surface of the fork ear away from the fork ear assembly (1), and an internal thread is processed on the inner wall of the blind hole; The outer side of the rod portion of the connecting rod (4) is also sleeved with a connecting tube (6), the outer surface of the connecting tube (6) is processed with an external thread, the inner hole of the connecting tube (6) forms the outlet of the shell, and the connecting tube (6) is connected to the internal thread of the blind hole through the external thread so that the telescopic device (3) is located between the head of the connecting rod (4) and the outlet.

6. The high fatigue cable capable of large displacement and expansion according to claim 5, characterized in that: The inner hole of the connecting cylinder (6) is a tapered through hole, and the small inner diameter end of the tapered through hole is close to the telescopic device (3).

7. The high fatigue cable capable of large displacement and expansion according to claim 1, characterized in that: An outer surface of one end of the rod extending out of the outlet is processed with an external thread, and the rod is connected to an anchor at the end of the cable (5) via the external thread.

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