CN117147305A - Bridge cable wire corrosion fatigue test device - Google Patents

Abstract

A bridge cable steel wire corrosion fatigue testing device, including two opposite clamp bodies. The clamp body includes a connector. A disassembly bolt is provided at the center of the opposite side of the two clamp bodies on the connector, and a disassembly bolt is provided at the center of the other side of the connector. There is a connecting rod, a preload jack is provided on the inner wall of the connecting body corresponding to the connecting rod, and an anchor cup is provided on the inner wall of the side corresponding to the disassembly bolt. The clamping piece is arranged inside the anchor cup, and a pier head is arranged on the upper part of the clamping piece. In the force transmission component, the telescopic end of the preloading jack is in contact with the upper part of the pier head force transmission component. The steel wire passes through the pier head force transmission component, the clip, and the disassembly bolt in sequence. There is a corrosion device on the steel wire between the two clamp bodies; When used in conjunction with a fatigue testing machine, the invention can effectively reduce the impact of the clamp on the steel wire and avoid the problem of wire breakage at the clamping point, thereby ensuring the smooth progress of the cable wire fatigue test.

Description

Bridge cable wire corrosion fatigue test device

Technical field

The invention belongs to the technical field of bridge engineering, and particularly relates to the technical field of bridge engineering testing, specifically a bridge cable steel wire corrosion fatigue testing device.

Background technique

In the design of long-span bridges, cable load-bearing bridges are widely used because of their large span capacity, good technical and economic indicators and aesthetic value. The core stress-bearing component of the long-span cable load-bearing bridge is the cable, and some of the cables are composed of galvanized steel wires. Because the bridge is subjected to dynamic loads such as running vehicles and wind loads, the cables are under the action of a dynamic load of alternating high and low tensile stress. With the help of analysis of the causes of actual cable breakage accidents, it is necessary to conduct cable fatigue test research. To study the fatigue properties of cables, it is necessary to study the fatigue properties of steel wires in the cables. Therefore, it is crucial to carry out basic experimental research on the fatigue of bridge cable wires.

To carry out corrosion fatigue tests and corrosion fatigue crack growth tests on bridge cable steel wires, it is first necessary to clamp the steel wires reasonably and scientifically to prevent the steel wires from breaking in the clamping area and nearby areas during the test. However, the current steel wire fatigue test fixture is not suitable for clamping the steel wires. When the steel wire is used, uneven stress, clamping damage, stress concentration, slippage, etc. will occur, which will affect the clamping effect of the clamp. And simultaneously apply corrosion and fatigue effects on the steel wire to observe and analyze the damage of the steel wire under the coupling effect of corrosion and fatigue. Therefore, it is necessary to provide a bridge cable steel wire corrosion fatigue test device and a new steel wire fatigue test fixture to simulate the corrosion and fatigue coupling environment encountered by the steel wire during service, reduce the impact of the fixture on the steel wire, and avoid the occurrence of steel wire damage at the clamping end and its nearby area. fracture, thus improving the validity of the test.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a method that can be used in conjunction with a fatigue testing machine to effectively clamp the steel wire, reduce the impact of the clamp on the steel wire, and prevent the steel wire from being stuck at the clamping end and its A fracture occurs in the nearby area, and corrosion is applied to the steel wire simultaneously, thereby ensuring the smooth conduct of the steel wire fatigue test. It is a bridge cable steel wire corrosion fatigue test device that is easy to disassemble and can observe the steel wire clamping situation.

The technical solution adopted to solve the above technical problems is: a bridge cable steel wire corrosion fatigue test device, which includes two opposite clamp bodies. The clamp bodies include a connector, and a detachable device is provided at the center position of the opposite side of the two clamp bodies on the connector. bolt, a connecting rod is provided at the center of the other side of the connecting body, a preloading jack is provided on the inner wall of the side corresponding to the connecting body and the connecting rod, an anchor cup is provided on the inner wall of the side corresponding to the disassembly bolt, and the clip is provided on the anchor Inside the cup, the upper part of the clamp is equipped with a pier head force transmission component. The telescopic end of the preloading jack is in contact with the upper part of the pier head force transmission component. The steel wire passes through the pier head force transmission component, the clip, and the disassembly bolt in sequence. The two clamp bodies A corrosion simulation device is installed on the steel wire between them.

The cross-sectional shape of the connecting body of the present invention is a rectangular structure. A connecting hole is processed at the center of the upper surface of the connecting body. First threaded holes are processed on both sides of the connecting hole on the upper surface of the connecting body. A third threaded hole is processed at the center of the lower surface of the connecting body. , second threaded holes are processed on both sides of the third threaded hole on the lower surface of the connecting body.

The connector of the present invention is provided with rectangular through holes in the width direction.

The clip of the present invention is in the shape of an inverted truncated cone, with a circular threading hole processed at the center and a 2mm deep circular groove processed at the top. The diameter of the circular groove is adapted to the diameter of the force transmission component of the pier head, and the cone angle is 8.5±1°. The 360° phase is divided into three equal parts into three fan-shaped structures, and the gap between adjacent fan-shaped structures is 1mm.

The inner surface of the clip of the present invention is toothless, and the roughness is the same as the surface roughness of the steel wire. The bottom of the clip is copper-plated within a range of 20 mm upward.

The force transmission component of the pier head of the present invention is: the gasket is arranged in the gasket collar, the gasket collar and the gasket are processed with corresponding light holes in the radial direction, and the clamping pin is arranged in the light hole; the gasket is symmetrical It consists of two parts of a semicircular structure. The center of the gasket is processed with a wire hole, and the contact point between the wire hole and the steel wire pier head is processed into a spherical shape.

The anchor cup of the present invention is a cylindrical structure with a tapered hole processed in the center. The taper within 15mm of the bottom of the tapered hole is 8°, and the taper of the remaining parts is 8.5°±1°, which is consistent with the taper angle of the clip. The bottom of the anchor cup A fifth threaded hole is machined.

The base of the preloading jack of the present invention is processed with a sixth threaded hole, the telescopic end is provided with a preloading rod, and the lower part of the preloading rod is processed with a rectangular groove.

The steel wire of the present invention is a hot-dip galvanized steel wire for bridge cables, and both ends of the steel wire are treated with pier heads.

The corrosion simulation device of the present invention is: the corrosion container has a hollow cylindrical structure, and glands are provided at both ends of the corrosion container. The glands press the metal gaskets and sealing rings to the ends of the corrosion container to form a sealing structure. There are two sets of gaskets and sealing rings spaced apart, with a through hole processed in the middle for the steel wire to pass through, and the corrosion container contains the corrosion solution.

Compared with existing devices, the present invention has the following advantages:

1. The pre-pressure device in the present invention applies pre-pressure to the clip before the steel wire is stretched, effectively preventing slippage in the clamp when the steel wire is stretched.

2. The clip in the present invention adopts a toothless form and the surface roughness is consistent with the steel wire. When the steel wire is stretched, there is a relative movement tendency between the steel wire and the clip, but the static friction between the steel wire and the clip will hinder the steel wire. Relative movement occurs with the clip. This movement trend will increase the relative positive pressure between the contact surface of the clip and the anchor cup. As a result, the relative positive pressure between the clip and the steel wire will increase, eventually resulting in static friction on the steel wire. As the force increases, the above effect is called the cone angle effect of the clip and the anchor cup. The cone angle effect will increase the static friction force on the steel wire as the tension increases, ensuring that the steel wire is firmly clamped and will not slip. In addition, the inner surface of the clip adopts a toothless structure to reduce surface damage caused by the clip to the steel wire. This can not only achieve effective clamping of the steel wire, but also reduce clamping damage and avoid wire slippage.

3. In the present invention, the taper of the clip and the anchor cup is 8.5° through finite element analysis and calculation, and is reduced by 0.5° within the lowermost 15mm range. The change in taper makes the clamping pressure appropriately transition and reduces stress concentration.

4. The present invention makes the steel wire easy to disassemble and the corrosive solution easy to replace, and can conduct a large number of experiments with variable parameters conveniently and economically, and has broad application prospects.

5. The pier head measure for clamping the steel wire in the present invention can be used as a safety reserve for steel wire slippage. The pier head force transmission assembly not only allows the pier head to bear part of the tensile force of the steel wire but also facilitates the preloading jack to transmit the preload to the clamp.

6. The hollowed-out part of the preloading rod in the present invention not only ensures that the preloading rod does not conflict with the space occupied by the steel wire at the pier head when transmitting force, but also allows the observation of the condition of the pier head part during the test.

7. The corrosion device in the present invention has a simple structure and is lightweight. The corrosion container can be made of transparent material, and the corrosion fatigue coupling part of the steel wire can be visually observed during the test.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a cross-sectional view of the clamp body in FIG. 1 .

Figure 3 is a schematic three-dimensional structural diagram and a cross-sectional view of the connecting body 1 in Figure 1.

Figure 4 is a schematic three-dimensional structural diagram and a cross-sectional view of the clip 2 in Figure 1.

Figure 5 is a schematic three-dimensional structural diagram and a cross-sectional view of the anchor cup 9 in Figure 1.

Figure 6 is a three-dimensional structural diagram and cross-sectional view of the force transmission component of the pier head in Figure 1.

Figure 7 is a schematic three-dimensional structural diagram of the preloading jack 10 and the preloading rod 8 in Figure 1.

FIG. 8 is a three-dimensional schematic diagram and a cross-sectional view of the corrosion simulation device 14 in FIG. 1 .

Figure 9 is a three-dimensional schematic diagram and a cross-sectional view of the corrosion container 14-1 in Figure 8.

Figure 10 is a three-dimensional structural diagram and a top view of the metal gasket 14-2 in Figure 8.

Figure 11 is a three-dimensional schematic diagram and a top view of the sealing ring 14-3 in Figure 8.

Figure 12 is a three-dimensional structural diagram and cross-sectional view of the gland 14-4 in Figure 8.

In the picture: 1. Connector; 2. Clamp; 3. Pin; 4. Gasket collar; 5. Gasket; 6. Steel wire; 7. Disassembly bolt; 8. Preload rod; 9. Anchor cup; 10. Preloading jack; 11. Connecting rod; 12. Preloading jack fixing bolt; 13. Anchor cup fixing bolt; 14. Corrosion simulation device; 1-1. Connection hole; 1-2. Second threaded hole; 1- 3. First threaded hole; 1-4, third threaded hole; 2-1, sector structure; 9-1, fifth threaded hole; sixth threaded hole 10-1; 14-1, corrosion container; 14-2 , metal gasket; 14-3, sealing ring; 14-4, gland; 14-5, corrosive solution.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and examples, but the present invention is not limited to these examples.

Example 1

In Figures 1, 2, and 3, the present invention relates to a bridge cable steel wire corrosion fatigue test device, which includes two clamp bodies facing each other up and down. The clamp body includes a connecting body 1, and the two clamping bodies on the connecting body 1 are opposite to each other. A disassembly bolt 7 is provided at the center of the side, and a connecting rod 11 is provided at the center of the other side of the connecting body 1 . Specifically, the cross-sectional shape of the connecting body 1 in this embodiment is a rectangular structure. A connecting hole 1-1 is processed at the center of the upper surface of the connecting body 1. The connecting rod 11 is disposed in the connecting hole 1-1. The free end of the connecting rod 11 Connected to the fatigue testing machine, first threaded holes 1-3 are processed on both sides of the connecting hole 1-1 on the upper surface of the connecting body 1, and a third threaded hole 1-4 is processed on the center of the lower surface of the connecting body 1. The disassembly bolt 7 is installed on The third threaded hole 1-4 is used to push out the clip 2, and second threaded holes 1-2 are processed on both sides of the third threaded hole 1-4 on the lower surface of the connecting body 1. In order to facilitate observation, a rectangular through hole is processed in the width direction of the connecting body 1, making the entire device intuitively visible during installation, disassembly and operation. Further, the connector 1 is made of No. 45 steel (Rockwell hardness requirement is about 45). The external outline dimensions of the connector are 190mm long, 130mm wide, and 300mm high. The internal hollowed-out dimensions are 130mm long, 130mm wide, and 130mm high. 220mm.

The preloading jack 10 is installed on the inner wall of the side corresponding to the connecting body 1 and the connecting rod 11 through the preloading jack fixing bolts 12 installed in the first threaded hole 1-3 and the sixth threaded hole 10-1. The connecting body 1 and The anchor cup 9 is fixedly connected to the inner wall of the corresponding side of the disassembly bolt 7 through the anchor cup fixing bolts 13 provided in the second threaded hole 1-2 and the fifth threaded hole 9-1, and the clip 2 is provided on the anchor cup 9 middle part. The upper part of the clamp 2 is provided with a pier head force transmission component. The telescopic end of the preloading jack 10 is in contact with the upper part of the pier head force transmission component. The steel wire 6 passes through the pier head force transmission component, the clip 2 and the disassembly bolt 7 in sequence. Steel wire 6 is a hot-dip galvanized steel wire for bridge cables, with a diameter of 7mm and a strength of 1670MPa, 1770MPa, 1860MPa, 1960MPa, 2060MPa or 2160MPa, with pier head treatment at both ends.

In Figure 4, the clip 2 of this embodiment is in the shape of an inverted truncated cone, with a circular threading hole processed at the center. The diameter of the circular threading hole is 7mm. A 2mm deep circular groove is processed at the top. The diameter of the circular groove is the same as that of the pier head. The diameter of the force transmission component is suitable, and the bottom of the clip 2 is chamfered by 2 mm. In this embodiment, the diameter is 47 mm. It is divided into three sector structures 2-1 within a 360° phase. The gap between adjacent sector structures 2-1 is 1mm. It is suitable for clamping diameters of Wire within range. Clamp 2 is made of 40 angstrom (Rockwell hardness requirement is about 45). The height of clamp 2 is 80mm, the taper angle is 8.5°±1°, the diameter of the bottom circle is 32mm, and the diameter of the top circle can be adjusted according to the taper and height. It is estimated that the inner surface of the clip 2 is toothless, and the roughness is the same as the surface roughness of the steel wire 6 . And the height range of 20mm above the bottom is copper-plated to reduce the friction between the contact surface with the steel wire. The clip 2 is located in the hollowed out part of the anchor cup 9, and its outer surface needs to be smoothed.

In Figure 5, the anchor cup 9 of this embodiment is a cylindrical structure with a tapered hole processed in the center. The bottom of the anchor cup 9 is processed with two fifth threaded holes 9-1 with a diameter of 10 mm, and is connected with the connector. The two second threaded holes 1-2 with a diameter of 10mm in the lower part of 1 correspond to each other. The anchor cup fixing bolts 13 are screwed into the threaded holes of the anchor cup 9 and the connecting body 1, so that the anchor cup 9 can be installed on the connecting body 1 in a centered manner. . Anchor cup 9 is made of No. 45 steel (Rockwell hardness requirement is about 45), with a height of 75mm and a diameter of 110mm; the internal hollow part has a cone angle of 8° within 15mm from the bottom, and the remaining part has a cone angle of 8.5°. ±1°, which is consistent with the cone angle of clip 2. The bottom diameter of the hollowed out part is 32mm, and the top diameter is calculated based on the cone angle and height.

In Figure 6, the pier head force transmission component of this embodiment is composed of a clamping pin 3, a gasket collar 4, and a gasket 5, all of which are made of No. 45 steel. The gasket 5 is installed in the gasket collar 4. The gasket collar 4 and the gasket 5 are processed with light holes in the radial direction. The pin 3 is installed in the light hole. The height of the gasket 5 is 12mm, the diameter is 27mm, and the middle part is processed with The diameter of the wire hole is 7mm. The top 2mm of the wire hole is in direct contact with the steel wire 6 pier head and is processed into a spherical surface similar to the shape of the pier head. The gasket 5 is composed of a symmetrical two-part semicircular structure, and two circular holes with a diameter of 2 mm and a depth of 3 mm are symmetrically dug out in the middle of the side along the direction perpendicular to the central axis. The appearance of the gasket collar 4 is cylindrical, with a height of 12mm and a diameter of 47mm. A circular hole with a diameter of 27mm is processed in the middle. Two circular holes with a diameter of 2mm that penetrate the gasket collar 4 are symmetrically dug out in the middle of the side for convenience. Pin 3 passes through. The card pin 3 has a cylindrical structure with a diameter of 2mm and a length of 16mm. The gasket collar 4 tightens the gasket 5, and the clamping pin 3 connects the gasket 5 and the gasket collar 4 as a whole. The gasket 5 and the gasket collar 4 in the force transmission assembly of the pier head are located in the hollowed out part of the top of the clamp 2.

In Figure 7, the base of the preloading jack 10 of this embodiment is processed with a sixth threaded hole 10-1, and a preloading rod 8 is installed on the telescopic end. The preloading jack 10 uses a 10-ton small manual hydraulic jack, and the preloading rod 8 It is a cylindrical structure with a rectangular groove processed in the lower part, and the 6-wire pier head is located in the rectangular groove. The lowermost end of the preloading rod 8 is in contact with the force transmission component of the pier head.

In Figures 8 to 12, the corrosion device of this example is composed of a corrosion container 14-1, a metal gasket 14-2, a sealing ring 14-3, and a gland 14-4. The corrosion container 14-1 is a hollow cylindrical shape. Structure, the smooth hollow cylinder can be made of transparent materials, which is convenient for the operator to visually observe the corrosion situation. The outer diameter is 45mm, the inner diameter is 35mm, and the height is 50mm. Both ends of the corrosion container 14-1 are processed with 10mm high, The external thread with a pitch of 1mm has an outer diameter of 43mm and an inner diameter of 38mm. It forms a step with the 35mm inner diameter of the corrosion container 14-1. The step is used to place the metal gasket 14-2 and the sealing ring 14-3. Both ends of the corrosion container 14-1 are provided with glands 14-4 through threaded fasteners.

The gland 14-4 is a hollow cylindrical structure with an outer diameter of 50mm and a height of 15mm. A cylinder with a diameter of 35mm and a height of 5mm is cut out in the middle of the top surface, and a cylinder with a diameter of 45mm and a height of 10mm is cut out in the middle of the bottom. , and set an internal thread with a height of 6mm and a pitch of 1mm to facilitate the spiral connection with the corrosion container 14-1.

The gland 14-4 presses the metal gasket 14-2 and the sealing ring 14-3 against the end of the corrosion container 14-1 to form a sealing structure. The metal gasket 14-2 and the sealing ring 14-3 are processed with a through hole in the middle. The hole allows the steel wire 6 to pass through. In this embodiment, two sets of metal gaskets 14-2 and sealing rings 14-3 are provided at intervals. The metal gasket 14-2 is composed of two semi-cylinders, and the middle curve of the semi-cylinders is S-shaped. The sealing ring 14-3 has a diameter of 37mm and a thickness of 2mm. The sealing ring 14-3 has a diameter of 37mm and a thickness of 3mm. The corrosion container 14-1 contains the corrosion solution 14-5. Change the concentration of the corrosion solution by changing the NaCl content, and adjust the pH value of the corrosion solution by using glacial acetic acid or sodium hydroxide solution.

The installation process of the bridge cable steel wire corrosion fatigue test device of the present invention is as follows:

First, the corrosion simulation device 14 is passed through the steel wire 6 and placed in the steel wire corrosion fatigue coupling section. The corrosion simulation device 14 is assembled from bottom to top. After the assembly is completed, the contact point between the bottom of the corrosion simulation device 14 and the steel wire 6 is sealed with 704 silicone rubber. ; The connecting rod 11 and the disassembly bolt 7 are installed on the connecting body 1, and the fatigue testing machine clamps the connecting rod 11, which completes the connection with the fatigue testing machine. Secondly, fix the anchor cup 9 at the bottom of the connecting body 1 through the anchor cup fixing bolt 13, insert the steel wire 6 from the lower through hole of the connecting body 1 and through the anchor cup 9, and then put the clip 2 into Anchor cup 9, and the inner side of clip 2 clamps steel wire 6, and the outer side is in contact with anchor cup 9. Then place the gasket 5 at the lower part of the head end of the steel wire pier, and cover the gasket collar 4. Use the pin 3 to connect the gasket 5 and the gasket collar 4 together. Thereafter, the preloading jack 10 is fixed at the top inside the connecting body 1 through the preloading jack fixing device 12. The preloading rod 8 is installed below the preloading jack 10. The preloading jack 10 is connected to the steel wire 6 through the preloading rod 8. Before stretching, a pre-pressure is applied to the clamp 2 so that the device can clamp the steel wire 6 to prevent the steel wire 6 from slipping at the clamp when it is stretched. Two clamp bodies are set opposite each other at both ends of the steel wire 6 to complete the clamp body and steel wire test. After such connection, use an injection needle to fill the corrosion device 14 with corrosion solution, and the fatigue machine applies a fatigue load to perform a corrosion fatigue test and a corrosion fatigue crack growth test.

The disassembly process of the bridge cable steel wire corrosion fatigue test device of the present invention is as follows:

Use an injection needle to remove the corrosion solution in the corrosion simulation device 14, adjust the hydraulic device of the preload jack 10 to recover the preload, and remove the preload rod 8. Tighten the disassembly bolt 7 upward to push out the clip 2, take out the clip 2 from the connecting body 1, and screw the disassembly bolt 7 back to its original position. First take out the pin 3 on the gasket collar 4, then remove the gasket 5 and the gasket collar 4, take out the steel wire 6 and put it in place, then take out the bottom sealing silicone rubber of the corrosion simulation device 14, and finally remove the corrosion simulation device 14 . Remove the anchor cup fixing bolts 13 and then remove the anchor cup 9. Loosen the chuck of the fatigue machine, first remove the connecting body 1, and then remove the connecting rod 11. Disassembly is now complete.

Claims (10)

1. The utility model provides a bridge cable steel wire corrosion fatigue test device which characterized in that: including two relative anchor clamps bodies, the anchor clamps body include connector (1), two anchor clamps opposite sides central point put on connector (1) and be provided with dismantlement bolt (7), connector (1) another side central point put and be provided with connecting rod (11), be provided with pre-compaction jack (10) on the inner wall of one side that connector (1) corresponds with connecting rod (11), be provided with anchor cup (9) on the inner wall of one side that corresponds with dismantlement bolt (7), clamping piece (2) set up in anchor cup (9) inside, clamping piece (2) upper portion is provided with pier nose and passes power subassembly, the flexible end of pre-compaction jack (10) contacts with pier nose power subassembly upper portion, steel wire (6) pass pier nose power subassembly, clamping piece (2), dismantlement bolt (7) in proper order, be provided with on steel wire (6) between two anchor clamps body and corrode simulator (14).

2. The bridge cable steel wire corrosion fatigue test device according to claim 1, wherein: the cross-section shape of connector (1) be rectangular structure, connector (1) upper surface central point puts and processes there is connecting hole (1-1), and connector (1) upper surface connecting hole (1-1) both sides processing have first screw hole (1-3), connector (1) lower surface central point put and process there is third screw hole (1-4), connector (1) lower surface third screw hole (1-4) both sides processing have second screw hole (1-2).

3. The bridge cable steel wire corrosion fatigue test device according to claim 2, wherein: rectangular through holes are formed in the width direction of the connector (1).

4. The bridge cable steel wire corrosion fatigue test device according to claim 1, wherein: the clamping piece (2) is of an inverted truncated cone shape, a round threading hole is machined in the center, a round groove with the depth of 2mm is machined in the top, the diameter of the round groove is matched with the diameter of the pier head force transmission assembly, the cone angle is 8.5+/-1 degrees, three fan-shaped structures (2-1) are trisected in 360 degrees of phase, and the gap between every two adjacent fan-shaped structures (2-1) is 1mm.

5. The bridge cable steel wire corrosion fatigue test device according to claim 4, wherein: the inner surface of the clamping piece (2) is toothless, the roughness is the same as that of the steel wire (6), and copper plating treatment is carried out within the range of 20mm upwards at the bottom of the clamping piece (2).

6. The bridge cable steel wire corrosion fatigue test device according to claim 1, wherein the pier head force transmission assembly is: the gasket (5) is arranged in the gasket lantern ring (4), the gasket lantern ring (4) and the gasket (5) are correspondingly provided with unthreaded holes in the radial direction, and the clamping needle (3) is arranged in the unthreaded holes; the gasket (5) is composed of two symmetrical semicircular structures, a wire penetrating hole is formed in the center of the gasket (5), and the contact part of the wire penetrating hole and the pier head of the steel wire (6) is processed into a sphere.

7. The bridge cable steel wire corrosion fatigue test device according to claim 1, wherein: the anchor cup (9) is of a cylindrical structure with a conical hole machined in the center, the taper of the bottom end of the conical hole is 8 degrees within 15mm, the taper of the rest part of the conical hole is 8.5 degrees+/-1 degrees, the conical angle of the anchor cup is consistent with that of the clamping piece (2), and a fifth threaded hole (9-1) is machined in the bottom of the anchor cup (9).

8. The bridge cable steel wire corrosion fatigue test device according to claim 1, wherein: the base of the pre-pressing jack (10) is provided with a sixth threaded hole (10-1), the telescopic end of the base is provided with a pre-pressing rod (8), and the lower part of the pre-pressing rod (8) is provided with a rectangular groove.

9. The bridge cable steel wire corrosion fatigue test device according to claim 1, wherein: the steel wire (6) is a hot dip galvanized steel wire for bridge cables, and pier heads are processed at two ends of the steel wire (6).

10. The bridge cable steel wire corrosion fatigue test device according to claim 1, wherein: the corrosion simulation device (14) is as follows: the corrosion container (14-1) is of a hollow cylindrical structure, the two ends of the corrosion container (14-1) are respectively provided with a gland cover (14-4), the metal gasket (14-2) and the sealing ring (14-3) are tightly pressed on the end part of the corrosion container (14-1) by the glands (14-4) to form a sealing structure, 2 groups of metal gaskets (14-2) and the sealing ring (14-3) are arranged at intervals, the middle parts of the metal gaskets are provided with through holes to enable the steel wires (6) to pass through, and the corrosion container (14-1) is filled with the corrosion solution (14-5).