CN104316407A - Fatigue test device and test method of steel stranded wire in bending state - Google Patents
Fatigue test device and test method of steel stranded wire in bending state Download PDFInfo
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- CN104316407A CN104316407A CN201410643231.4A CN201410643231A CN104316407A CN 104316407 A CN104316407 A CN 104316407A CN 201410643231 A CN201410643231 A CN 201410643231A CN 104316407 A CN104316407 A CN 104316407A
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Abstract
The invention discloses a fatigue test device and a test method of a steel stranded wire in a bending state. The fatigue test device comprises a fatigue tester and a cable saddle device connected with the fatigue tester, wherein the fatigue tester is connected with the cable saddle device via a screw rod; an elastic support is arranged below the cable saddle device; bending holes for placing the tested steel stranded wire are formed in the cable saddle device; and the two ends of the tested steel stranded wire are fixed on limiting supports via connecting components. The fatigue test device of the steel stranded wire in the bending state achieves a fatigue test of the steel stranded wire in the bending state, and ensures test quality, test efficiency and test data reliability; and the test method is easy and simple to operate, good in test quality and reliable in test data.
Description
Technical field
The present invention relates to steel strand wires fatigue experimental device and test method under a kind of case of bending, relate to the fatigue test method evaluating bridge construction steel strand wires fatigue lifetime, be specially adapted to a kind of dragline anchorage fatigue test method with cable saddle evaluating suspension bridge construction steel hinge line fatigue lifetime.
Background technology
In actual industrial production process, torture test is the process measuring material or structural fatigue stress or number of strain cycles.Fatigue is under CYCLIC LOADING condition, occurs in that material point place is local, permanent damage increasing process, and after enough stress or Cyclic Strain, damage accumulation can make material generation crackle, or crackle extends further to and ruptures completely.Torture test has now become a requisite link in cable production line process.
Prestressing technique has been widely used in science of bridge building.Wherein, steel strand wires are as component most important in prestressing technique, and its mechanical property change, has very important effect to whole prestress system.Therefore, be necessary to the mechanical property research of suspension bridge steel strand wires under actual condition.
At present, domestic steel strand wires fatigue test method is mainly based on the tensile fatigue test of steel strand wires under linear state.Test method is for fix tested steel strand wires and torture test machine clamp, and steel strand wires linear state, carries out the tension test of specified number of times, observes steel strand wires with or without fatigue breakdown, to judge whether the mechanical property of this batch of steel strand wires meets relevant criterion.But, trystate is not identical with the actual condition of steel strand wires, use classic fatigue test method cannot simulate the mechanical property of steel strand wires under actual condition, under actual condition, steel strand wires are many in arch, so pass judgment on the mechanical property of suspension bridge steel strand wires with classic fatigue test the data obtained and improper.
In order to inquire into the fatigue resistance being used for the steel hinge line that suspension bridge is built further, simulation actual condition is needed to carry out torture test to steel hinge line, the conclusion of reality more can be met.In order to the steel hinge line fatigue resistance built for suspension bridge better can be reflected, and be applied in the middle of Practical Project, be badly in need of a kind of steel hinge line fatigue test method of simulating actual condition, make conclusion (of pressure testing) more closer to reality situation.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides steel strand wires fatigue experimental device and test method thereof under a kind of case of bending, solves the problem of carrying out steel strand wires torture test in the bent state; And solve the problem of warranty test quality, efficiency and test figure reliability.
Technical scheme: for solving the problems of the technologies described above, steel strand wires fatigue experimental device under a kind of case of bending of the present invention, the cable saddle device comprise fatigue tester, being connected with fatigue tester, fatigue tester is connected by screw rod with cable saddle device, elastic support is provided with below cable saddle device, the inside of cable saddle device is provided with the bent hole placing tested steel strand wires, and the two ends of tested steel strand wires are fixed on spacing bearing by coupling assembling, and coupling assembling is connected with pre-tightening apparatus.
As preferably, described coupling assembling comprises ground tackle, intermediate plate and nut, and the paired composition self-locking chuck of described intermediate plate is for clamping tested steel strand wires, and ground tackle inside has through hole, and self-locking chuck is positioned at through hole, and ground tackle is connected with nut.
As preferably, described through hole is back taper through hole, and the profile of self-locking chuck is suitable coniform with back taper through hole.
As preferably, the center of the medial surface of described intermediate plate, in the vertical direction have the groove of the tested steel strand wires of one clamping, intermediate plate inwall have draw-in groove tooth.
As preferably, described cable saddle device comprises several arch steel pipes and the back up pad for supporting arch steel pipe, and arch steel pipe inner wall is smooth, by being welded to form an entirety between arch steel pipe, back up pad is uniformly distributed, and with arch steel-pipe welding for it provides enough anchorage forces.
A test method for steel strand wires fatigue experimental device under the case of bending of any one of application rights requirement described in 1 to 5, comprises the following steps:
Step one, is passed the corresponding arch through hole of cable saddle device according to the radical of tested steel strand wires;
Step 2, according to test length, the position of adjustment stop means and the height of elastic support are also fixed;
Step 3, the corresponding through hole of ground tackle is passed in its two ends by the radical according to tested steel strand wires;
Step 4, merges into self-locking intermediate plate by corresponding respectively for two pairs of intermediate plates and be enclosed within the end of tested steel strand wires, penetrating the corresponding through hole of ground tackle (21);
Step 5, by tested steel strand wires pre-tightening apparatus pretension to test load section, and ensures that the pretightning force on the tested steel strand wires of every root is identical;
Step 6, is connected fatigue tester with cable saddle device by power transferring structure;
Step 7, after checking each connecting link, starts fatigue tester, carries out steel strand wires torture test, and record test figure.
Beneficial effect: steel strand wires fatigue experimental device and test method thereof under a kind of case of bending of the present invention, have the following advantages:
1, instant invention overcomes the shortcoming that conventional steel twisted wire can only carry out linear state torture test, solve the technical matters of carrying out steel strand wires torture test in the bent state, improve the reliability of test mass, efficiency and test figure.
2, the present invention is achieved by cable saddle device and tested steel strand wires is placed in the object that case of bending carries out torture test, ensure that the curvature of steel strand wires in process of the test is consistent with suspension bridge actual curvature, so that can the anti-fatigue performance of accurate tested steel twisted wire, improve the accuracy of test, whole test unit structure be simple, be easy to processing, convenient disassembly, reusable, and also test method is simple, simple operation, improves test efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of test unit of the present invention;
Fig. 2 is the cross-sectional view of ground tackle of the present invention;
Fig. 3 is the structural representation of coupling assembling of the present invention;
Fig. 4 is the main TV structure schematic diagram of intermediate plate of the present invention;
Fig. 5 is the cross-sectional view of self-locking chuck of the present invention;
Fig. 6 is the structural representation of self-locking chuck of the present invention;
Fig. 7 is the cross-sectional view of nut of the present invention;
Fig. 8 is the structural representation of cable saddle device of the present invention;
Fig. 9 is the diagrammatic cross-section of cable saddle device of the present invention;
Figure 10 is the structural representation of pre-tightening apparatus of the present invention.
The tested steel strand wires of Reference numeral: 1-, 2-coupling assembling, 21-ground tackle, 22-intermediate plate, 23-nut, 24-groove, 3-cable saddle device, 4-fatigue tester, 5-elastic support, 6-stop means, 7 pretightening jacks.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figures 1 to 10, the cable saddle device 3 comprising fatigue tester 4 and be placed on elastic support 5, there is bending through hole the inside of cable saddle device 3, pass for tested steel strand wires 1, and making it present case of bending, the stop means 6 at elastic support 5 and two ends can according to the convenient change height of the test length of tested steel strand wires 1 and span.Tested steel strand wires 1 are fixed on the stop means 6 at two ends by coupling assembling 2, described coupling assembling is made up of ground tackle 21, intermediate plate 22 and nut 23, described intermediate plate 22 in pairs composition self-locking clip head-clamp is held in tested steel strand wires 1 two ends, through the through hole of ground tackle 21, nut 23 makes coupling assembling 2 and stop means 6 close contact, with pre-tightening apparatus, tested steel strand wires 1 are tightened to test load in advance, fatigue tester 4 is connected by bolt jointing part with cable saddle device 3.Pre-tightening apparatus comprises pretightening jack 7 and fixture, and fixture is connected with ground tackle 21, pulls fixture thus the tested steel strand wires 1 of pretension by pretightening jack 7.
As shown in Figure 2 and Figure 3, ground tackle 21 is cylindrical-shaped structure, there is screw thread on the face of cylinder, to be connected with nut 23, its end face has 7 back taper through holes, back taper through hole and self-locking chuck agrees with and surface of contact is smooth, ensure that self-locking chuck can slippage freely under the pretightning force of tested steel strand wires drives, slippage darker, then the holding force of self-locking chuck is larger, thus ensures that tested steel strand wires can not slippage in process of the test.
As shown in Figure 4, Figure 5 and Figure 6, self-locking chuck is made up of two symmetrical intermediate plates 22, two intermediate plates 22 are combined into the chuck of back taper, agree with the back taper through hole of ground tackle 21, the center of the medial surface of intermediate plate 22, in the vertical direction have the groove 24 of the tested steel strand wires 1 of one clamping, tested steel strand wires 1 can be encased, intermediate plate 22 inwall has draw-in groove tooth, larger holding force can be provided.
As Fig. 8, Fig. 9, cable saddle device is made up of arch steel pipe and supporting plate structure, and arch steel pipe is according to specifically using curvature design, inner wall smooth, by being welded to form an entirety between arch steel pipe, back up pad is uniformly distributed, and with arch steel-pipe welding for it provides enough anchorage forces.
Apply a test method for steel strand wires fatigue experimental device under described case of bending, concrete steps are as follows:
Step one, is passed the corresponding arch through hole of cable saddle device 3 according to the radical of tested steel strand wires 1;
Step 2, according to test length, the position of adjustment stop means 6 and the height of elastic support 5 are also fixed;
Step 3, the corresponding through hole of ground tackle 21 is passed in its two ends by the radical according to tested steel strand wires 1;
Step 4, merges into self-locking intermediate plate by corresponding respectively for two pairs of intermediate plates 22 and be enclosed within the end of tested steel strand wires 1, penetrating the corresponding through hole of ground tackle 21;
Tested steel strand wires 1 are used pre-tightening apparatus pretension to test load section, and are ensured that the pretightning force on the tested steel strand wires of every root 1 is identical by step 5;
Step 6, is connected fatigue tester 4 with cable saddle device 3 by screw rod;
Step 7, after checking each connecting link, starts fatigue tester 4, carries out steel strand wires torture test, and record test figure.
Embodiment
Be 140mm with xsect
27 epoxy steel hinge lines be processed into the long test specimen 8 ~ 12 of 10m, therefrom random selecting 4 is tested.Utilize hydraulic oil pump by tested steel hinge line pretension, and utilize ground tackle 21, intermediate plate 22 and nut 23 to fix tested steel strand wires 1, make elastic support 5 can provide 40T acting force straight up.Be connected with cable saddle device 3 by fatigue tester 4 and test, the output of setting fatigue tester 4 is the load of Sine distribution, and wherein maximum load is 14t, and minimum load is 1t, and real time record cycle index and running status.Through the test of 110 hours, cycle index reaches 2,000,000 times, off-test.This time there is not fatigure failure in test steels hinge line, illustrates that it meets the requirement of suspension bridge construction.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. steel strand wires fatigue experimental device under a case of bending, it is characterized in that: the cable saddle device comprise fatigue tester, being connected with fatigue tester, fatigue tester is connected by screw rod with cable saddle device, elastic support is provided with below cable saddle device, the inside of cable saddle device is provided with the bent hole placing tested steel strand wires, the two ends of tested steel strand wires are fixed on spacing bearing by coupling assembling, and coupling assembling is connected with pre-tightening apparatus.
2. steel strand wires fatigue experimental device under case of bending according to claim 1, it is characterized in that: described coupling assembling comprises ground tackle, intermediate plate and nut, the paired composition self-locking chuck of described intermediate plate is for clamping tested steel strand wires, ground tackle inside has through hole, self-locking chuck is positioned at through hole, and ground tackle is connected with nut.
3. steel strand wires fatigue experimental device under case of bending according to claim 2, is characterized in that: described through hole is back taper through hole, and the profile of self-locking chuck is suitable coniform with back taper through hole.
4. steel strand wires fatigue experimental device under case of bending according to claim 3, it is characterized in that: the center of the medial surface of described intermediate plate, in the vertical direction have the groove of the tested steel strand wires of one clamping, the circular groove of paired composition, intermediate plate inwall has draw-in groove tooth.
5. steel strand wires fatigue experimental device under case of bending according to claim 1, it is characterized in that: described cable saddle device comprises several arch steel pipes and the back up pad for supporting arch steel pipe, arch steel pipe inner wall is smooth, by being welded to form an entirety between arch steel pipe, back up pad is uniformly distributed, and with arch steel-pipe welding for it provides enough anchorage forces.
6. application rights requires a test method for steel strand wires fatigue experimental device under the case of bending of any one described in 1 to 5, and it is characterized in that, concrete steps are as follows:
Step one, is passed the corresponding arch through hole of cable saddle device according to the radical of tested steel strand wires;
Step 2, according to test length, the position of adjustment stop means and the height of elastic support are also fixed;
Step 3, the corresponding through hole of ground tackle is passed in its two ends by the radical according to tested steel strand wires;
Step 4, merges into self-locking intermediate plate by corresponding respectively for two pairs of intermediate plates and be enclosed within the end of tested steel strand wires, penetrating the corresponding through hole of ground tackle (21);
Step 5, by tested steel strand wires pre-tightening apparatus pretension to test load section, and ensures that the pretightning force on the tested steel strand wires of every root is identical;
Step 6, is connected fatigue tester with cable saddle device by power transferring structure;
Step 7, after checking each connecting link, starts fatigue tester, carries out steel strand wires torture test, and record test figure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410643231.4A CN104316407A (en) | 2014-11-13 | 2014-11-13 | Fatigue test device and test method of steel stranded wire in bending state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410643231.4A CN104316407A (en) | 2014-11-13 | 2014-11-13 | Fatigue test device and test method of steel stranded wire in bending state |
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| CN104316407A true CN104316407A (en) | 2015-01-28 |
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| CN201410643231.4A Pending CN104316407A (en) | 2014-11-13 | 2014-11-13 | Fatigue test device and test method of steel stranded wire in bending state |
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Cited By (3)
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| CN105403454A (en) * | 2015-12-21 | 2016-03-16 | 中国船舶重工集团公司第七○二研究所 | Jaw vice anchorage anchor device used for single-hole steel strand fatigue test |
| CN109001060A (en) * | 2018-07-18 | 2018-12-14 | 西南交通大学 | A kind of drawing hoist cable pulling force width and the two-way index fatigue experimental device of anchored end corner and method |
| CN113640096A (en) * | 2021-06-30 | 2021-11-12 | 哈尔滨工业大学（深圳） | Device for auxiliary measurement of nonlinear rigidity of steel wire rope |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105403454A (en) * | 2015-12-21 | 2016-03-16 | 中国船舶重工集团公司第七○二研究所 | Jaw vice anchorage anchor device used for single-hole steel strand fatigue test |
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| CN109001060A (en) * | 2018-07-18 | 2018-12-14 | 西南交通大学 | A kind of drawing hoist cable pulling force width and the two-way index fatigue experimental device of anchored end corner and method |
| CN113640096A (en) * | 2021-06-30 | 2021-11-12 | 哈尔滨工业大学（深圳） | Device for auxiliary measurement of nonlinear rigidity of steel wire rope |
| CN113640096B (en) * | 2021-06-30 | 2023-10-24 | 哈尔滨工业大学（深圳） | Device for assisting in measuring nonlinear rigidity of steel wire rope |
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Application publication date: 20150128 |