CN215727398U - Inhaul cable bending fatigue test device - Google Patents

Abstract

The utility model relates to a cable bending fatigue test device which comprises a moving end loading tool, a fixed end loading tool, a transverse loading device and a loading cross beam, wherein the two ends of a cable to be tested respectively move the end loading tool and the fixed end loading tool, the transverse loading device can apply external force to the middle position of the cable to be tested, so that the cable to be tested deviates to generate a bending angle with the angle deviation of 5mrad +/-5 mrad and periodic change, the bending fatigue test is carried out, the working state of a large-span stay cable can be truly simulated, and the stay cable, namely the failure reason of the cable to be tested, can be analyzed and researched.

Description

Inhaul cable bending fatigue test device

Technical Field

The utility model relates to the technical field of a cable bending fatigue test, in particular to a cable bending fatigue test device.

Background

The large-span stay cable is a main stress component of the cable-stayed bridge, can reduce the bending moment in a beam body, reduce the building height, lighten the structural weight and save materials. For example, the Wuhan Changjiang river second bridge and the Sutong bridge are cable-stayed bridges which are used as main stress structural members and have direct influence on the structural safety and the service life of the cable-stayed bridge. Due to the adverse factors such as corrosion degradation and earthquake-resistant fatigue attenuation, the problem that all cable-stayed bridges must face is to have to be replaced, and therefore how to realize a device convenient for performing a cable bending fatigue test is a technical problem to be solved urgently in the industry.

SUMMERY OF THE UTILITY MODEL

The utility model provides a stay cable bending fatigue test device aiming at the defects of the prior art.

The technical scheme of the stay cable bending fatigue test device is as follows:

the test device comprises a moving end loading tool, a fixed end loading tool, a transverse loading device and a loading cross beam, wherein the transverse loading device is connected to the middle position of the loading cross beam, the two ends of the loading cross beam are respectively connected with the moving end loading tool and the fixed end loading tool, the two ends of a to-be-tested cable are respectively connected with the moving end loading tool and the fixed end loading tool, the transverse loading device is connected with the to-be-tested cable to apply pressure to the to-be-tested cable, and the direction of the pressure applied by the transverse loading device is perpendicular to the extending direction of the to-be-tested cable.

The stay cable bending fatigue test device has the following beneficial effects:

the two ends of the stay cable to be tested are respectively provided with the end loading tool and the fixed end loading tool in a moving mode, the transverse loading device can apply external force to the middle position of the stay cable to be tested, the stay cable to be tested deviates to generate a bending angle with the angle deviation of 5mrad +/-5 mrad in periodic change so as to carry out bending fatigue resistance test, the working state of the large-span stay cable can be truly simulated, and therefore the stay cable to be tested, namely the failure reason of the stay cable to be tested, can be conveniently analyzed and researched.

On the basis of the scheme, the bending fatigue test device for the inhaul cable can be further improved as follows.

The movable trolley is characterized by further comprising a movable trolley provided with an air spring, wherein the movable trolley is respectively installed at the bottoms of the movable end loading tool and the fixed end loading tool, the axial direction of the air spring of the movable trolley corresponding to the movable end loading tool is perpendicular to the bottom of the movable end loading tool, and the axial direction of the air spring of the movable trolley corresponding to the fixed end loading tool is perpendicular to the bottom of the fixed end loading tool.

The beneficial effect of adopting the further scheme is that: the loading tool is kept horizontal by adjusting the weight of the air spring inflation pressure balance loading beam, the moving end loading tool and the fixed end loading tool clamp.

Furthermore, the transverse loading device comprises a servo oil cylinder and a transverse loading rod, one end of the transverse loading rod is connected with the stay cable to be tested, and the servo oil cylinder is used for driving the transverse loading rod to generate displacement.

Further, the movable end loading tool comprises a basic fixture and a transition fixture for connecting the stay cable to be tested, wherein the basic fixture is connected with the transition fixture through two oppositely arranged guide stand columns.

Further, the foundation clamp comprises a transition anchorage device base plate matched with the anchor ring of the inhaul cable to be tested, so that the inhaul cable to be tested is connected through the matching of the transition anchorage device base plate and the anchor ring of the inhaul cable to be tested.

Further, the test device also comprises an angle measuring device which is used for being installed on the stay cable to be tested.

Drawings

FIG. 1 is a front view of a cable bending fatigue testing apparatus according to an embodiment of the present invention;

FIG. 2 is a left side view of the cable bending fatigue testing apparatus of FIG. 1;

FIG. 3 is a front view of the lateral loading apparatus;

FIG. 4 is a top view of one of the lateral loading devices of FIG. 3;

FIG. 5 is a front view of the dolly;

FIG. 6 is a top view of the mobile cart of FIG. 5;

FIG. 7 is a front view of the mobile end loading fixture;

fig. 8 is a left side view of the moving end loading fixture of fig. 7.

In the drawings, the components represented by the respective reference numerals are listed below:

1. loading a tool at a mobile terminal; 2. moving the trolley; 3. a beam sliding base; 4. loading a beam; 5. a transverse loading device; 6. a cable to be tested; 7. an angle measuring device; 8. the beam is hinged with the base; 9. loading a tool at the fixed end; 10. a first gasket; 11. a guide connecting frame; 12. a horizontal roller; 13. a first screw; 14. a pin; 15. a cotter pin; 16. an upper hinge base; 17. a hinged base; 18. a first bearing housing; 19. a first tapered roller bearing; 20 a sliding guide shaft; 501. a sensor connecting frame; 502. a 200KN spoke sensor; 503. a locking pad; 504. a transverse loading rod; 505. a connecting member; 506. a clamp spring; 507. a first pin shaft; 508. guiding the movable cross beam; 509. a second screw; 511. a first guiding fixed cross beam; 512. a linear bearing; 513. a guide post; 514. a servo cylinder; 515. a third screw; 516. a wheel; 517. a second tapered roller bearing; 518. a second pin shaft; 519. a bearing gland; 520. a fourth screw; 521. a first spring washer; 522. a fifth screw; 523. a first nut; 524. a sixth screw; 525. a seventh screw; 526. a second guiding fixed beam; 527. an eighth screw; 528. a second spring washer; 201. a ninth screw; 202. a tenth screw; 203. a third spring washer; 204. a protective cover; 205. an air spring upper cover plate; 206. an eleventh screw; 207. an air spring; 208. a twelfth screw; 209. a first spring locking washer; 210. pressing the sleeve; 211. a rolling wheel; 212. a thirteenth screw; 213. a second spring locking washer; 214. a trolley assembly; 215. a fourteenth screw; 216. a second nut; 217. an anti-collision rubber pad; 101. a transition fixture; 102. a third nut; 103. a guide wheel bracket; 104. a horizontal stick; 105. a guide upright post; 106. a transition anchor backing plate; 107. a base fixture; 108. a third tapered roller bearing; 109. a bearing end cap; 110. a fifteenth screw; 111. a second gasket; 112. a roller support; 113. a second bearing housing; 114. a rolling bearing; 115. a roll axis;

the implementation, functional features and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

As shown in fig. 1 and 2, the bending fatigue test device for the guy cable according to the embodiment of the present invention includes a moving end loading tool 1, a fixed end loading tool 9, a transverse loading device 5 and a loading beam 4, wherein the transverse loading device 5 is connected to the middle position of the loading beam 4, two ends of the loading beam 4 are respectively connected to the moving end loading tool 1 and the fixed end loading tool 9, two ends of a guy cable 6 to be tested are respectively connected to the moving end loading tool 1 and the fixed end loading tool 9, the transverse loading device 5 is connected to the guy cable 6 to be tested to apply pressure to the guy cable 6 to be tested, and the direction of the pressure applied by the transverse loading device 5 is perpendicular to the extending direction of the guy cable 6 to be tested.

The two ends of the stay cable 6 to be tested are respectively moved by the end loading tool 1 and the fixed end loading tool 9, the transverse loading device 5 can apply external force to the middle position of the stay cable 6 to be tested, so that the stay cable 6 to be tested deviates to generate a bending angle with the angular deviation of 5mrad +/-5 mrad and periodic change, a bending fatigue resistance test is carried out, the working state of the large-span stay cable can be truly simulated, and the stay cable, namely the failure reason of the stay cable 6 to be tested, can be conveniently analyzed and researched.

Preferably, in the above technical solution, the device further includes a moving trolley 2 provided with an air spring 207, the moving end loading tool 1 and the fixed end loading tool 9 are respectively provided with one moving trolley 2 at the bottom, the axial direction of the air spring 207 of the moving trolley 2 corresponding to the moving end loading tool 1 is perpendicular to the bottom of the moving end loading tool 1, and the axial direction of the air spring 207 of the moving trolley 2 corresponding to the fixed end loading tool 9 is perpendicular to the bottom of the fixed end loading tool 9.

The weight of the clamp of the loading beam 4, the moving end loading tool 1 and the fixed end loading tool 9 is balanced by adjusting the inflation pressure of the air spring 207, so that the loading tool is kept horizontal.

Specifically, the method comprises the following steps: the bending fatigue test device for the stay cable comprises a moving end loading tool 1, a fixed end loading tool 9, a moving trolley 2, a cross beam sliding base 3, a loading cross beam 4, a transverse loading device 5, an angle measuring device 7, a cross beam hinging base 8, a first gasket 10, a guiding connecting frame 11, a horizontal roller 12, a first screw 13, a pin 14, a split pin 15, an upper hinging base 16, a hinging base 17, a first bearing seat 18, a first conical roller bearing 19 and a sliding guide shaft 20, wherein the moving trolley 2 is respectively installed at the bottoms of the moving end loading tool 1 and the fixed end loading tool 9, and two ends of the stay cable 6 to be tested are respectively connected with the moving end loading tool 1 and the fixed end loading tool 9 and used for measuring the bending fatigue test of the parallel steel wire stay cable with the large-span stay cable. Providing experimental conditions for the performance evaluation of the anti-bending fatigue life of the stay cable;

the utility model provides a cable bending fatigue test device can realize through horizontal loading device 5 that the cable body exerts force F to the intermediate position of the cable 6 of awaiting measuring and makes the central line of the cable 6 of awaiting measuring produce angular deflection, and 5mrad of angular deflection periodicity change to the actual operating mode of the cable 6 of awaiting measuring is promptly simulated to the load frequency of actual record, output load size. And analyzing and recording the data acquired by the sensors such as the vibration frequency, the deflection angle, the axial load, the transverse load and the like in real time to judge the aging of the stay cable.

The transverse loading device 5 comprises a sensor connecting frame 501, a 200KN spoke type sensor 502, a locking pad 503, a transverse loading rod 504, a connecting piece 505, a clamp spring 506, a pin shaft, a guide movable cross beam 508, a second screw 509, a first guide fixed cross beam 511, a linear bearing 512, a guide column 513, a servo oil cylinder 514, a third screw 515, a wheel 516, a second tapered roller bearing 517, a second pin shaft 518, a bearing gland 519, a fourth screw 520, a first spring gasket 521, a fifth screw 522, a first nut 523, a sixth screw 524, a seventh screw, a second guide fixed cross beam 526, an eighth screw 527 and a second spring gasket 528. The transverse loading rod 504 is connected with the 200KN spoke type sensor 502, the sensor connecting frame 501, the wheel 516, the pin shaft and the second tapered roller bearing 517 to apply external force to the middle position of the stay cable 6 to be tested. The second tapered roller bearing 517 rolls along with the deformation of the cable 6 to be tested, and the servo cylinder 514 resists the lateral force generated in the loading process through the linear bearing 512.

As shown in fig. 5 and 6, the movable trolley 2 mainly comprises a ninth screw 201, a tenth screw 202, a third spring washer 203, a protective cover 204, an air spring upper cover plate 205, an eleventh screw 206, an air spring 207, a twelfth screw 208, a first spring locking washer 209, a pressing sleeve 210, a rolling wheel 211, a thirteenth screw 212, a second spring locking washer 213, a trolley assembly 214, a fourteenth screw 215, a second nut 216, and a crashproof rubber pad 217, and the weight of the clamp of the loading cross beam 4, the movable end loading tool 1 and the fixed end loading tool 9 is balanced by adjusting the inflation pressure of the air spring 207, so that the loading tool is kept horizontal.

As shown in fig. 7 and 8, the moving end loading tool 1 includes a transition fixture 101, a third nut 102, a guide wheel bracket 103, a horizontal roller 104, a guide column, a transition anchor backing plate 106, a base fixture 107, a third conical roller bearing 108, a bearing end cover 109, a fifteenth screw 110, a second gasket 111, a roller bracket 112, a second bearing seat 113, a rolling bearing 114, and a rolling shaft 115. The movable end loading tool 1 connecting clamp is connected with an external loading device through a screw, and is connected with a basic clamp 107 through a third nut 102 and a guide wheel bracket 103. And the second gasket 111 is ground to adjust the fitting degree of the horizontal rod 104 and the guide upright post, so that the influence of lateral force on the execution oil cylinder in the bending fatigue test process is balanced, the reliability of the equipment is improved, and the service life of the equipment is prolonged.

Preferably, in the above technical solution, the transverse loading device 5 includes a servo cylinder 514 and a transverse loading rod 504, one end of the transverse loading rod 504 is connected to the cable 6 to be tested, and the servo cylinder 514 is used for driving the transverse loading rod 504 to generate displacement.

Preferably, in the above technical solution, the moving end loading fixture 1 includes a base fixture 107 and a transition fixture 101 for connecting the cable 6 to be tested, and the base fixture and the transition fixture 101 are connected through two oppositely arranged guide pillars.

Preferably, in the above technical solution, the base fixture 107 includes a transition anchor backing plate 106 adapted to the anchorage ring of the cable 6 to be tested, so as to connect the cable 6 to be tested through the adaptation of the transition anchor backing plate 106 to the anchorage ring of the cable 6 to be tested.

Preferably, in the above technical solution, the test device further comprises an angle measuring device 7 for being installed on the cable to be tested 6.

At present, the bending fatigue test of a large-span stay cable mainly comprises two modes, 1, a wedge-shaped base plate of 10mrad is adopted on the cross section of a cable anchor of a stay cable 6 to be tested, so that the center line of the stay cable 6 to be tested deviates from the center line of the anchor to form an angle of 10 mrad; 2. and applying an external force F to the middle position of the inhaul cable 6 to be tested to enable the inhaul cable 6 to be tested to deviate from the center line of the anchorage device, and the angle of the inhaul cable 6 to be tested deviates by 5mrad +/-5 mrad of bending angle which changes periodically. The experimental device adopts a second bending fatigue test method, counteracts the lateral force generated during transverse loading through structural design, and can measure and control the deflection bending angle of the stay cable 6 to be tested in real time.

In another embodiment, the bending fatigue test device for the parallel steel wire cable of the large-span stay cable comprises a moving end loading tool 1, a transition anchor base plate 106, a guide wheel, a moving trolley 2, a loading cross beam 4, a transverse loading device 5, a cross beam sliding base 3, a cross beam hinged base 17, a fixed end loading tool 9 and a bending angle measuring system, and is used for measuring the bending fatigue test device for the parallel steel wire cable of the large-span stay cable. Providing experimental conditions for the performance evaluation of the anti-bending fatigue life of the stay cable; the axial loading can be applied to the stay cable 6 to be tested, meanwhile, the force F is applied to the middle position of the stay cable 6 to be tested, so that the central line of the stay cable 6 to be tested generates angular deviation, the angular deviation is 5mrad +/-5 mrad in periodic change, and the actual loading frequency and the output load are actually recorded to simulate the actual working condition of the stay cable. And analyzing and recording the data acquired by the sensors such as the vibration frequency, the deflection angle, the axial load, the transverse load and the like in real time to judge the aging of the stay cable.

The transverse loading device 5 is fixed on the loading beam 4 through screws; one end of the loading beam 4 is hinged to the fixed end loading tool 9, the other end of the loading beam is fixed on the movable end loading tool 1 through the beam sliding base 3, and the position of the loading beam 4 relative to the fixed end loading tool 9 and the movable end loading tool 1 can be adjusted. The bottoms of the fixed end loading tool 9 and the movable end loading tool 1 are supported by the movable trolley 2, and the weight of the loading beam 4 and the transverse loading device 5 is balanced by an air spring 207 in the movable trolley 2.

The moving end loading tool 1 comprises a transition clamp 101, a third nut 102, a guide wheel bracket 103, a horizontal roller 104, a guide upright post, a transition anchor device base plate 106, a foundation clamp 107, a third conical roller bearing 108, a bearing end cover 109, a fifteenth screw 110, a second gasket 111, a roller bracket 112, a second bearing seat 113, a rolling bearing 114 and a rolling shaft 115. The transition clamp 101 of the moving end loading tool 1 is connected with an external loading device through a screw, and is connected with a base clamp 107 at the front end through a guide upright and a third nut 102. The foundation clamp 107 comprises a transition anchor backing plate 106 matched with the anchor ring of the cable to be tested 6, so that the cable to be tested 6 is connected through the matching of the transition anchor backing plate 106 and the anchor ring of the cable to be tested 6. The front end of the transition anchor device base plate 106 is provided with a guide angle, and the guide angle is automatically centered during axial loading, so that the measurement precision is improved.

The transverse loading device 5 comprises a sensor connecting support, a 200KN spoke type sensor 502, a displacement sensor, a locking pad 503, a transverse loading rod 504, a connecting piece 505, a pin shaft, a guide movable cross beam 508, a first guide fixed cross beam 511, a ground second guide fixed cross beam 526, a linear bearing 512, a guide seat, a servo oil cylinder 514, a roller, a second tapered roller bearing 517, a pin shaft, a bearing end cover 109, a cross beam, a hinged seat and a guide support seat. The servo oil cylinder 514 is installed on the upper end face of the loading beam 4 through a guide fixed beam, and is connected with the 200KN spoke type sensor 502 through a transition piece, and the sensor connecting bracket applies an external force F to the middle position to be tested through a first pin shaft 507, a second tapered roller bearing 517 and a roller. The second pin 518 tapered roller bearing rolls along with the deformation of the cable 6 to be tested, and the servo oil cylinder 514 resists the lateral force generated in the loading process through the linear bearing 512.

The movable trolley 2 mainly comprises a protective cover 204, a trolley assembly 214, an air spring 207, positioning screws, namely a tenth screw 202, an eleventh screw 206, a twelfth screw 208, a thirteenth screw 212, a fourteenth screw 215 and a crash pad 217. The weights of the air spring 207 inflation pressure balance loading beam 4, the moving end loading tool 1 and the fixed end loading tool 9 are adjusted, so that the moving end loading tool 1 and the fixed end loading tool 9 are kept horizontal. The whole moving trolley 2 moves along with the moving end loading tool 1 and the fixed end loading tool 9. When the loading device is used, the positioning screws are adjusted to enable the axis of the loading tool to be kept horizontal, and then the loading cross beam 4 and the transverse loading device 5 are installed.

The utility model discloses a bending fatigue test device for a stay cable, belongs to an experimental device, and particularly relates to a bending fatigue test device for a parallel steel wire stay cable of a long-span stay cable. The bending fatigue test device for the large-span inhaul cable parallel steel wire inhaul cable comprises a guide device, a moving end loading tool 1, a fixed end loading tool 9, a transition anchor device base plate 106, a transverse loading device 5, a loading cross beam 4, a moving trolley 2 and an air spring 207. The device provided by the utility model provides a set of bending fatigue test device suitable for a large-span stay cable parallel steel wire stay cable with an anchor ring diameter not more than 500mm, a stay cable length not more than 6500mm, an axial loading force not more than 10000KN and a transverse loading force not more than 200 KN.

In the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (6)

1. The utility model provides a cable bending fatigue test device, its characterized in that, is including removing end loading frock (1), stiff end loading frock (9), horizontal loading device (5) and loading crossbeam (4), and horizontal loading device (5) are connected the intermediate position of loading crossbeam (4), the both ends of loading crossbeam (4) are connected respectively remove end loading frock (1) with stiff end loading frock (9), the both ends of awaiting measuring cable (6) are connected respectively remove end loading frock (1) with stiff end loading frock (9), horizontal loading device (5) connect await measuring cable (6) in order to await measuring cable (6) applied pressure, just the direction of the pressure that horizontal loading device (5) was applied with the extending direction of awaiting measuring cable (6) is perpendicular.

2. The inhaul cable bending fatigue test device according to claim 1, further comprising a moving trolley (2) provided with an air spring (207), wherein the moving trolley (2) is respectively installed at the bottoms of the moving end loading tool (1) and the fixed end loading tool (9), the axial direction of the air spring (207) of the moving trolley (2) corresponding to the moving end loading tool (1) is perpendicular to the bottom of the moving end loading tool (1), and the axial direction of the air spring (207) of the moving trolley (2) corresponding to the fixed end loading tool (9) is perpendicular to the bottom of the fixed end loading tool (9).

3. A cable bending fatigue testing device according to claim 1 or 2, wherein the transverse loading device (5) comprises a servo cylinder (514) and a transverse loading rod (504), one end of the transverse loading rod (504) is connected with the cable (6) to be tested, and the servo cylinder (514) is used for driving the transverse loading rod (504) to generate displacement.

4. A cable bending fatigue testing device according to claim 1 or 2, wherein the moving end loading fixture (1) comprises a base fixture (107) and a transition fixture (101) for connecting the cable (6) to be tested, and the base fixture (107) and the transition fixture (101) are connected through two oppositely arranged guide columns (105).

5. A cable bending fatigue testing device according to claim 4, characterized in that the base clamp (107) comprises a transition anchor pad adapted to the anchorage ring of the cable (6) to be tested, so as to connect the cable (6) to be tested through the adaptation of the transition anchor pad to the anchorage ring of the cable (6) to be tested.

6. A cable bending fatigue testing device according to claim 1 or 2, further comprising an angle measuring device (7) for mounting on the cable (6) to be tested.

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