CN104690665A - Double-layer jig for fatigue elongation test of ordinary steel bar and prestressed steel bar, as well as mounting technique for double-layer jig - Google Patents
Double-layer jig for fatigue elongation test of ordinary steel bar and prestressed steel bar, as well as mounting technique for double-layer jig Download PDFInfo
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Abstract
The invention provides a double-layer jig for a fatigue elongation test of an ordinary steel bar and a prestressed steel bar, as well as a mounting technique for the double-layer jig, and aims to improve the test efficiency and prolong the service life of a test machine. The jig includes a jig head formed by a load reducing jig and a load holding jig, wherein the jig head is connected with the test machine through a connecting device. The double-layer jig for the steel strand fatigue test adopts the double anchoring technology, so that compared with the traditional jig, the double-layer jig achieves less clamping damage at the ends of a steel strand. Therefore, the difficult problem of end clamping damage in the steel strand fatigue test is successfully solved.
Description
Technical field:
The present invention relates to a kind of regular reinforcement and presstressed reinforcing steel tired tension test double-deck fixture and mounting process, concrete finger in the tired tension test of steel strand wires by arranging off-loading fixture to reduce the load held lotus fixture and bear, reduce the fatigue damage caused by occlusion defect of steel strand wires end, and then reduce the risk causing test failure because steel strand wires end destroys.
Background technology: along with the development of prestressing technique, prestressed structure is widely used in large scale structure engineering or science of bridge building.Because these structures frequently stand the effect of cyclic reverse loading in-service, the research of the fatigue behaviour of prestressed structure is made to become a large hot issue of current field of civil engineering.Current, prestress wire fatigue test way is generally that the long section fixture of hydraulic pressure that provides in producer is carried out.Utilize long section fixture effectively can solve steel strand wires slippage problems in test, but also increase the Clamping damage of steel strand wires end simultaneously, accelerate the broken end speed of steel strand wires, reduce success of the test probability.In addition, because the hardness of steel strand wires is higher, hydraulically operated fixture directly clamps steel strand wires and easily causes holder contacts face to occur bite mark phenomenon, affects the service life of machine.In sum, traditional experiment fixture is utilized not only to affect the reliability of test data, also can accelerated test equipment aging.
Summary of the invention
Goal of the invention: the invention provides a kind of regular reinforcement and presstressed reinforcing steel tired tension test double-deck fixture and mounting process, its objective is the problem that efficiency is low and service life is inadequate existing for solution equipment in the past.
Technical scheme: the present invention is achieved through the following technical solutions:
A kind of regular reinforcement and the double-deck fixture of the tired tension test of presstressed reinforcing steel, is characterized in that: this fixture comprises by by off-loading fixture and the clamp head of holding lotus fixture and forming, and clamp head is connected with testing machine by jockey.
Off-loading fixture comprises off-loading clip jaw, off-loading clamp base and off-loading fixture bottom; Off-loading clip jaw is arranged on inside off-loading clamp base, and off-loading clamp base is connected with jockey, and off-loading fixture bottom is arranged on one end that off-loading clamp base is connected with jockey; Holding lotus fixture is common steel strand tension moveable anchor, comprise and hold lotus clamp base and hold lotus clip jaw, hold lotus clip jaw and be arranged on innermost layer, hold lotus clip jaw and be arranged on the inner side of holding lotus clamp base, hold the inner side that lotus clamp base is arranged on off-loading clamp base.
Off-loading clip jaw comprises aluminium cover, steel bushing and the large intermediate plate of steel taper.
The face that off-loading clamp base contacts with off-loading clip jaw is the inclined-plane adapted with the tapered slope of off-loading clip jaw, and the inclination alpha on its inclined-plane gets 30 °, and aluminium cover thickness Τ 2 gets 3mm, and aluminium cover length L2 should not be less than 8mm.
Jockey comprises double-deck fixture branch sleeve, connecting rod, pre-load nut one, pre-load nut two and testing machine connecting base plate; Connecting rod one end is connected with testing machine connecting base plate with pre-load nut two by pre-load nut one, and other end cover has double-deck fixture branch sleeve; Off-loading clamp base injects in double-deck fixture branch sleeve; Testing machine connecting base plate is connected with testing machine.
Contact surface between double-deck fixture branch sleeve and connecting rod is sphere, and spheric curvature is identical, and double-deck fixture branch sleeve is concave spherical surface, and connecting rod is convex spherical, and its spherical diameter D is not less than 2m.
Regular reinforcement described above and the tired tension test mounting process of double-deck fixture of presstressed reinforcing steel, is characterized in that: need to carry out jockey installation before formal installation, pretension installs and pretension loads, its key step is as follows:
(1) installing and connecting apparatus on testing machine;
(2) pretension is installed, and steel strand wires first will be assisted to load in clamp head, be then installed on jockey by clamp head;
(3) pretension loads, first firing test machine, with the speed of 2kN/s at the uniform velocity extended steel twisted wire, until pulling force exceedes 20% of the experimental design load upper limit, then stopping loading and holding carrying a 5min, holding in year process by tightening pre-load nut one and pre-load nut two completes pretension work, finally unloading, take off clamp head, close testing machine;
(4) formal test is installed, and changes auxiliary steel strand wires, first from clamp head, takes out auxiliary steel strand wires, and is replaced with test steels twisted wire, then reinstall clamp head by installation steps.
(1) the inner surface thread depth L3 of off-loading clamp base outer surface thread height L1, double-deck fixture branch sleeve and the specification of pre-load nut one and pre-load nut two need be determined according to the anti-extrusion computing formula of screw thread pair by peak load and pretension load, and meet shear strength check, self-locking property check requirement simultaneously;
(2) wall thickness T 1 of off-loading clamp base, the wall thickness T 3 of double-deck fixture branch sleeve and the diameter T5 of connecting rod determine according to the axle center hot strength formula of peak load by steel;
(3) the minimum thickness T6 of the double-deck minimum thickness T4 of fixture branch sleeve concave spherical surface, the convex spherical of connecting rod determines according to the axial compression strength formula of peak load by steel.
9, regular reinforcement according to claim 7 and the tired tension test mounting process of double-deck fixture of presstressed reinforcing steel, is characterized in that: the step of the method is as follows:
(1) step concrete grammar is as follows: connecting rod is inserted in sleeve by (one); (2) pre-load nut one and pre-load nut two are screwed on connecting rod; (3) utilize the screw thread of connecting rod, connecting rod is connected with testing machine connecting base plate.
(2) in step, method is as follows: the first step, installs auxiliary steel strand wires; First, auxiliary steel strand wires are inserted in off-loading clamp base; Secondly, aluminium cover, steel bushing and the large intermediate plate of steel taper to be bonded together sequentially successively composition off-loading clip jaw with adhesive; Again, utilize adhesive tape that the off-loading clip jaw pasted is fixed on auxiliary steel strand wires outer surface, afterwards off-loading intermediate plate is pushed into off-loading base bottom; Finally, lotus clamp base will be held and hold lotus clip jaw and be arranged on off-loading intermediate plate rear end successively, and screwing bottom simultaneously and off-loading intermediate plate is closed in off-loading clamp base with holding lotus clamp base and hold lotus clip jaw; Second step, installs double-deck fixture; The double-deck fixture that will install steel strand wires is by be placed in shown in Figure 11 in the middle of jockey and to be rotationally connected sleeve, and what make off-loading base is threaded in sleeve, is connected by double-deck fixture with testing machine;
(3) step is specific as follows: (one) firing test machine, adopts power control mode to stretch to auxiliary steel strand wires; (2) at the uniform velocity load with the speed of 2kN/s, until after exceeding 20% of the experimental design load upper limit, stop loading; (3) holding a year 5min, holding in the process of carrying, with spanner, pre-load nut two, pre-load nut one being tightened successively; (4) be offloaded to 0kN, the screw thread unclamping sleeve takes off double-deck fixture, then closes testing machine.
Advantage and effect:
The invention provides a kind of regular reinforcement and presstressed reinforcing steel tired tension test double-deck fixture and mounting process, object is the service life of improving test efficiency and extending testing machine.
Advantage of the present invention and good effect as follows:
The first, reduce the risk that test specimen fatigue damage is destroyed, significantly improve success of the test probability.Double-deck fixture of the present invention, on the one hand share load action in fatigue test owing to adding off-loading fixture, decrease and act on the single load held on lotus fixture, effectively reduce the Clamping damage of steel strand wires end, on the other hand owing to using aluminium cover to carry out flexible clamping to steel strand wires in off-loading fixture, improve the stress concentration phenomenon of gripping place steel strand wires, success of the test probability is significantly improved;
The second, extend the service life of testing machine.Pretension mounting process of the present invention, namely, before formal installation, connecting rod applies precompression, the screw thread of testing machine terminal pad can be made to be in pressured state all the time, effectively prevent owing to directly loading the screw thread fatigue damage that may cause, extend the life-span of test terminal pad.
The double-deck fixture of steel strand wires fatigue test of the present invention adopts suspension cable anchorage technology, compared with conventional brace, alleviates the Clamping damage of steel strand wires end, successfully solves a difficult problem for steel strand wires fatigue test medial end portions Clamping damage.
Accompanying drawing illustrates:
Fig. 1 double-deck fixture head unit figure
Fig. 2-1 off-loading clamp base detail drawing
Fig. 2-2 are the top view of Fig. 2-1
Fig. 3-1 off-loading clip jaw detail drawing
Fig. 3-2 are the top view of Fig. 3-1
Fig. 4 off-loading fixture bottom detail drawing
The jockey figure of the double-deck fixture of Fig. 5
Fig. 6-1 double-deck fixture branch sleeve detail drawing
Fig. 6-2 are the top view of 6-1
Fig. 7-1 connecting rod detail drawing
Fig. 7-2 are the top view of Fig. 7-1
Fig. 8-1 pre-load nut detail drawing
Fig. 8-2 are the top view of 8-1
Fig. 9 installation steps one (installing connecting rod and double-deck fixture branch sleeve)
The double-deck fixture installation diagram of Figure 10
Figure 11 installation steps two, three (pretension is installed and formally installed)
Label and symbol description
1, off-loading clip jaw; 2, off-loading clamp base; 3, lotus clamp base is held; 4, lotus clip jaw is held; 5, off-loading fixture bottom; 6, aluminium cover; 7, steel bushing; 8, the large intermediate plate of steel taper; 9, double-deck fixture branch sleeve; 10, connecting rod; 11, pre-load nut one; 12, pre-load nut two; 13, testing machine connecting base plate; 14, auxiliary steel strand wires; 15, steel strand wires are tested.
L1-off-loading base outer surface thread depth; L2-steel taper large intermediate plate height/aluminium (copper) cover height; The inner surface thread depth of L3-branch sleeve.
The wall thickness of T1-off-loading base; ; Τ 2-aluminium cover thickness; The wall thickness of T3-branch sleeve; The minimum thickness of T4-branch sleeve 9. concave spherical surface; The diameter of T5-connecting rod; The minimum thickness of the convex spherical of T6-connecting rod.
D-connecting rod and joint sleeve contact surface diameter; α-off-loading base inclination angle of inclined plane.
Detailed description of the invention: the present invention will be further described below in conjunction with accompanying drawing:
As illustrated in fig. 1 and 2, the invention provides the double-deck fixture of the tired tension test of a kind of regular reinforcement and presstressed reinforcing steel, it is characterized in that: this fixture comprises by by off-loading fixture and the clamp head of holding lotus fixture and forming, and clamp head is connected with testing machine by jockey.
Off-loading fixture comprises off-loading clip jaw 1, off-loading clamp base 2 and off-loading fixture bottom 5; Off-loading clip jaw 1 is arranged on inside off-loading clamp base 2, and off-loading clamp base 2 is connected with jockey, and off-loading fixture bottom 5 is arranged on one end that off-loading clamp base 2 is connected with jockey; Holding lotus fixture is common steel strand tension moveable anchor, comprise and hold lotus clamp base 3 and hold lotus clip jaw 4, hold lotus clip jaw 4 and be arranged on innermost layer, hold lotus clip jaw 4 and be arranged on the inner side of holding lotus clamp base 3, hold the inner side that lotus clamp base 3 is arranged on off-loading clamp base 2.
Off-loading clip jaw 1 comprises aluminium cover 6, steel bushing 7 and the large intermediate plate 8 of steel taper.
The face that off-loading clamp base 2 contacts with off-loading clip jaw 1 is the inclined-plane adapted with the tapered slope of off-loading clip jaw 1, and the inclination alpha on its inclined-plane gets 30 °, and aluminium cover thickness Τ 2 gets 3mm, and aluminium cover length L2 should not be less than 8mm.
Jockey comprises double-deck fixture branch sleeve 9, connecting rod 10, pre-load nut 1, pre-load nut 2 12 and testing machine connecting base plate 13; Connecting rod 10 one end is connected with testing machine connecting base plate 13 with pre-load nut 2 12 by pre-load nut 1, and other end cover has double-deck fixture branch sleeve 9; Off-loading clamp base 2 injects in double-deck fixture branch sleeve 9; Testing machine connecting base plate 13 is connected with testing machine.
Contact surface between double-deck fixture branch sleeve 9 and connecting rod 10 is sphere, and spheric curvature is identical, and double-deck fixture branch sleeve 9 is concave spherical surface, and connecting rod 10 is convex spherical, and its spherical diameter D is not less than 2m.
This device adopts engagement thread to connect in the design process completely, should be noted following some: the inner surface thread depth L3 of (1) off-loading base outer surface thread depth L1, branch sleeve and the specification of pre-load nut one, two need be determined according to the anti-extrusion computing formula of screw thread pair by peak load (pretension load), and meet simultaneously shear strength check, self-locking property check requirement; (2) the diameter T5 of the wall thickness T 1 of off-loading base, the wall thickness T 3 of branch sleeve and connecting rod need determine according to the axle center hot strength formula of peak load by steel; (3) the minimum thickness T6 of the minimum thickness T4 of branch sleeve 9 concave spherical surface, the convex spherical of connecting rod need determine according to the axial compression strength formula of peak load by steel.
Regular reinforcement described above and the presstressed reinforcing steel tired tension test mounting process of double-deck fixture, formal install before need to carry out jockey installation, pretension installs and pretension loads, its key step is as follows:
(1) installing and connecting apparatus on testing machine;
(2) pretension is installed, and first loads in clamp head by auxiliary steel strand wires 14, is then installed on jockey by clamp head;
(3) pretension loads, first firing test machine, with the speed of 2kN/s at the uniform velocity extended steel twisted wire, until pulling force exceedes 20% of the experimental design load upper limit, then stopping loading and holding carrying a 5min, holding in year process by tightening pre-load nut 1 and pre-load nut 2 12 completes pretension work, finally unloading, take off clamp head, close testing machine;
(4) formal test is installed, and changes auxiliary steel strand wires, first from clamp head, takes out auxiliary steel strand wires, and is replaced with test steels twisted wire, then reinstall clamp head by installation steps 2.
(1), the inner surface thread depth L3 of off-loading clamp base 2 outer surface thread height L1, double-deck fixture branch sleeve 9 and the specification of pre-load nut 1 and pre-load nut 2 12 need be determined according to the anti-extrusion computing formula of screw thread pair by peak load and pretension load, and meet that shear strength is checked, self-locking property checks requirement simultaneously;
(2), the wall thickness T 1 of off-loading clamp base 2, the wall thickness T 3 of double-deck fixture branch sleeve 9 and the diameter T5 of connecting rod determine according to the axle center hot strength formula of peak load by steel;
(3), the minimum thickness T6 of the double-deck minimum thickness T4 of fixture branch sleeve 9 concave spherical surface, the convex spherical of connecting rod 10 determines according to the axial compression strength formula of peak load by steel.
See Fig. 1-Figure 11, steel strand wires fatigue test of the present invention is with mainly comprising double-deck grip device (Fig. 1), double-deck fixture jockey (Fig. 5) and mounting process (Fig. 9, Figure 11) thereof in the enforcement figure shown in double-deck fixture and mounting process thereof.
Concrete operations are as follows: 1) installing and connecting apparatus, and its step is as follows: connecting rod 10 is inserted in sleeve 9 by (1); (2) pre-load nut 1 and pre-load nut 2 12 are screwed on connecting rod 10; (3) utilize the screw thread of connecting rod 10, connecting rod is connected (see Fig. 9) with testing machine connecting base plate 13.
2) pretension is installed, and its step is as follows: the first step, installs auxiliary steel strand wires 14.First, auxiliary steel strand wires 14 are inserted in off-loading clamp base 2; Secondly, aluminium cover 6, steel bushing 7 and the large intermediate plate 8 of steel taper to be bonded together sequentially successively composition off-loading clip jaw 1 with adhesive; Again, utilize adhesive tape that the off-loading clip jaw 1 pasted is fixed on auxiliary steel strand wires 14 outer surface, afterwards off-loading intermediate plate 1 is pushed into bottom off-loading base 2; Finally, lotus clamp base 3 will be held and hold lotus clip jaw 4 and be arranged on off-loading intermediate plate 1 rear end successively, and screw bottom 5 simultaneously and off-loading intermediate plate 1 is closed in off-loading clamp base 2 with holding lotus clamp base 3 and hold lotus clip jaw 4.Second step, installs double-deck fixture.The double-deck fixture (Figure 10) that will install steel strand wires is by be placed in shown in Figure 11 in the middle of jockey 5 and to be rotationally connected sleeve 9, and what make off-loading base 2 is threaded in sleeve 9, is connected by double-deck fixture with testing machine.
3) pretension loads, and its step is as follows: (1) firing test machine, adopts power control mode to stretch to auxiliary steel strand wires 14; (2) at the uniform velocity load with the speed of 2kN/s, until after exceeding 20% of the experimental design load upper limit, stop loading; (3) holding a year 5min, holding in the process of carrying, with spanner, pre-load nut 2 12, pre-load nut 1 being tightened successively; (4) be offloaded to 0kN, unclamp sleeve screw thread 9. and take off double-deck fixture, then close testing machine.
4) formal test is installed, and change auxiliary steel strand wires, take out from fixture, be replaced with test steels twisted wire, its installation steps install 2 with pretension) identical.
The present invention is relative to the superiority of the hydraulically operated fixture that classic fatigue is tested: the first, reduces the risk that test specimen fatigue damage is destroyed, and improves success of the test probability.Because traditional experiment fixture is the clamping action that the snap-in force utilizing biting teeth to produce realizes to steel strand wires, but this method of clamping can cause bite mark phenomenon to the retaining part of steel strand wires, especially in fatigue test, the bite mark degree of depth increases gradually with the increase of times of fatigue, to such an extent as to there is phenomenon of rupture in steel strand wires end, cause fatigue test failure.According to above-mentioned experimental phenomena, double-deck fixture proposed by the invention is mainly shared by off-loading fixture and is held fractional load suffered by lotus fixture, also can produce flexible gripping effect to steel strand wires by arranging smooth aluminum cover in off-loading intermediate plate simultaneously, so greatly can reduce the Clamping damage of steel strand wires end, significantly improve the chance of success of fatigue test.The second, the service life of testing machine is extended.Pretension mounting process of the present invention, namely, before formal installation, connecting rod applies precompression, the screw thread of testing machine terminal pad can be made to be in pressured state all the time, effectively prevent owing to directly loading the screw thread fatigue damage that may cause, extend the life-span of test terminal pad.Three, reduce costs.Conventional hydraulic fixture need by testing machine producer custom-made, and fixture introduces hydraulic control, and fatigue test is simultaneously also comparatively serious to the damage of fixture, and therefore, experimentation cost and maintenance cost are all higher.The present invention, only by the acting in conjunction of holding lotus fixture and off-loading fixture, both greatly can reduce and buy test equipment equipment needed thereby funds, and can reduce again steel strand wires to the maintenance cost that damage produces holding lotus fixture, reach good economic benefit.
Claims (9)
1. the double-deck fixture of the tired tension test of regular reinforcement and presstressed reinforcing steel, is characterized in that: this fixture comprises by by off-loading fixture and the clamp head of holding lotus fixture and forming, and clamp head is connected with testing machine by jockey.
2. regular reinforcement according to claim 1 and the double-deck fixture of the tired tension test of presstressed reinforcing steel, is characterized in that: off-loading fixture comprises off-loading clip jaw (1), off-loading clamp base (2) and off-loading fixture bottom (5); Off-loading clip jaw (1) is arranged on off-loading clamp base (2) inner side, off-loading clamp base (2) is connected with jockey, and off-loading fixture bottom (5) is arranged on one end that off-loading clamp base (2) is connected with jockey; Holding lotus fixture is common steel strand tension moveable anchor, comprise and hold lotus clamp base (3) and hold lotus clip jaw (4), hold lotus clip jaw (4) and be arranged on innermost layer, hold lotus clip jaw (4) and be arranged on the inner side of holding lotus clamp base (3), hold the inner side that lotus clamp base (3) is arranged on off-loading clamp base (2).
3. regular reinforcement according to claim 2 and the double-deck fixture of the tired tension test of presstressed reinforcing steel, is characterized in that: off-loading clip jaw (1) comprises aluminium cover (6), steel bushing (7) and the large intermediate plate of steel taper (8).
4. regular reinforcement according to claim 3 and the double-deck fixture of the tired tension test of presstressed reinforcing steel, it is characterized in that: the face that off-loading clamp base (2) contacts with off-loading clip jaw (1) is the inclined-plane adapted with the tapered slope of off-loading clip jaw (1), the inclination alpha on its inclined-plane gets 30 °, aluminium cover thickness (Τ 2) gets 3mm, and aluminium cover length (L2) should not be less than 8mm.
5. regular reinforcement according to claim 3 and the double-deck fixture of the tired tension test of presstressed reinforcing steel, is characterized in that: jockey comprises double-deck fixture branch sleeve (9), connecting rod (10), pre-load nut one (11), pre-load nut two (12) and testing machine connecting base plate (13); Connecting rod (10) one end is connected with testing machine connecting base plate (13) with pre-load nut two (12) by pre-load nut one (11), and other end cover has double-deck fixture branch sleeve (9); Off-loading clamp base (2) injects in double-deck fixture branch sleeve (9); Testing machine connecting base plate (13) is connected with testing machine.
6. regular reinforcement according to claim 5 and the double-deck fixture of the tired tension test of presstressed reinforcing steel, it is characterized in that: the contact surface between double-deck fixture branch sleeve (9) and connecting rod (10) is sphere, and spheric curvature is identical, double-deck fixture branch sleeve (9) is concave spherical surface, connecting rod (10) is convex spherical, and its spherical diameter D is not less than 2m.
7. the tired tension test mounting process of double-deck fixture of regular reinforcement and presstressed reinforcing steel as claimed in claim 1, is characterized in that: formal install before need to carry out jockey installation, pretension installs and pretension loads, its key step is as follows:
(1) installing and connecting apparatus on testing machine;
(2) pretension is installed, and steel strand wires (14) first will be assisted to load in clamp head, be then installed on jockey by clamp head;
(3) pretension loads, first firing test machine, with the speed of 2kN/s at the uniform velocity extended steel twisted wire, until pulling force exceedes 20% of the experimental design load upper limit, then stopping loading and holding carrying a 5min, holding in year process by tightening pre-load nut one (11) and pre-load nut two (12) completes pretension work, finally unloading, take off clamp head, close testing machine;
(4) formal test is installed, and changes auxiliary steel strand wires, first from clamp head, takes out auxiliary steel strand wires, and is replaced with test steels twisted wire, then reinstall clamp head by installation steps (2).
8. regular reinforcement according to claim 7 and the tired tension test mounting process of double-deck fixture of presstressed reinforcing steel, is characterized in that:
(1) the inner surface thread depth (L3) of off-loading clamp base (2) outer surface thread height (L1), double-deck fixture branch sleeve (9) and the specification of pre-load nut one (11) and pre-load nut two (12) need be determined according to the anti-extrusion computing formula of screw thread pair by peak load and pretension load, and meet shear strength check, self-locking property check requirement simultaneously;
(2) diameter (T5) of the wall thickness (T1) of off-loading clamp base (2), the wall thickness (T3) of double-deck fixture branch sleeve (9) and connecting rod is determined according to the axle center hot strength formula of peak load by steel;
(3) minimum thickness (T6) of the double-deck minimum thickness (T4) of fixture branch sleeve (9) concave spherical surface, the convex spherical of connecting rod (10) is determined according to the axial compression strength formula of peak load by steel.
9. regular reinforcement according to claim 7 and the tired tension test mounting process of double-deck fixture of presstressed reinforcing steel, is characterized in that: the step of the method is as follows:
(1) step concrete grammar is as follows: connecting rod (10) is inserted in sleeve (9) by (one); (2) pre-load nut one (11) and pre-load nut two (12) are screwed on connecting rod (10); (3) utilize the screw thread of connecting rod (10), connecting rod is connected with testing machine connecting base plate (13).
(2) in step, method is as follows: the first step, installs auxiliary steel strand wires (14); First, steel strand wires (14) will be assisted to be inserted in off-loading clamp base (2); Secondly, with adhesive aluminium cover (6), steel bushing (7) and the large intermediate plate of steel taper (8) bonded together sequentially successively and form off-loading clip jaw (1); Again, utilize adhesive tape that the off-loading clip jaw (1) pasted is fixed on auxiliary steel strand wires (14) outer surface, afterwards off-loading intermediate plate (1) is pushed into off-loading base (2) bottom; Finally, lotus clamp base (3) will be held and hold lotus clip jaw (4) and be arranged on off-loading intermediate plate (1) rear end successively, and screw bottom (5) simultaneously and off-loading intermediate plate (1) is closed in off-loading clamp base (2) with holding lotus clamp base (3) and hold lotus clip jaw (4); Second step, installs double-deck fixture; The double-deck fixture installing steel strand wires be placed in jockey (5) centre and be rotationally connected sleeve (9), making being threaded in sleeve (9) of off-loading base (2), double-deck fixture is connected with testing machine;
(3) step is specific as follows: (one) firing test machine, adopts power control mode to stretch to auxiliary steel strand wires (14); (2) at the uniform velocity load with the speed of 2kN/s, until after exceeding 20% of the experimental design load upper limit, stop loading; (3) holding a year 5min, holding in the process of carrying, with spanner, pre-load nut two (12), pre-load nut one (11) being tightened successively; (4) be offloaded to 0kN, the screw thread unclamping sleeve (9) takes off double-deck fixture, then closes testing machine.
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| CN201510084675.3A CN104690665B (en) | 2015-02-16 | 2015-02-16 | Double-layer jig for fatigue elongation test of ordinary steel bar and prestressed steel bar, as well as mounting technique for double-layer jig |
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| CN201510084675.3A CN104690665B (en) | 2015-02-16 | 2015-02-16 | Double-layer jig for fatigue elongation test of ordinary steel bar and prestressed steel bar, as well as mounting technique for double-layer jig |
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| CN105508357A (en) * | 2015-12-22 | 2016-04-20 | 湖南大学 | Assembly device capable of reducing axial eccentricity of tensile sample, and operation method |
| CN108362536A (en) * | 2018-02-09 | 2018-08-03 | 广东省韶关市质量计量监督检测所 | A kind of processing method of Ribbed Bar axial tension fatigue test sample |
| CN114965025A (en) * | 2022-05-13 | 2022-08-30 | 哈尔滨工业大学 | Test fixture for nondestructive compression test of double-layer hollow thin plate |
| CN116429573A (en) * | 2023-04-17 | 2023-07-14 | 北京工业大学 | Welding type IGBT module bonding wire tensile testing device and method |
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| CN103630443A (en) * | 2013-12-20 | 2014-03-12 | 济南东测试验机技术有限公司 | Anchorage clip for steel strand fatigue test |
| CN103835318A (en) * | 2012-11-26 | 2014-06-04 | 昆山市建设工程质量检测中心 | Quick connecting piece in pile foundation static load test |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105508357A (en) * | 2015-12-22 | 2016-04-20 | 湖南大学 | Assembly device capable of reducing axial eccentricity of tensile sample, and operation method |
| CN108362536A (en) * | 2018-02-09 | 2018-08-03 | 广东省韶关市质量计量监督检测所 | A kind of processing method of Ribbed Bar axial tension fatigue test sample |
| CN114965025A (en) * | 2022-05-13 | 2022-08-30 | 哈尔滨工业大学 | Test fixture for nondestructive compression test of double-layer hollow thin plate |
| CN116429573A (en) * | 2023-04-17 | 2023-07-14 | 北京工业大学 | Welding type IGBT module bonding wire tensile testing device and method |
| CN116429573B (en) * | 2023-04-17 | 2023-12-08 | 北京工业大学 | Welding type IGBT module bonding wire tensile testing device and method |
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| CN104690665B (en) | 2017-04-19 |
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