CN104690665B - 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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- CN104690665B CN104690665B CN201510084675.3A CN201510084675A CN104690665B CN 104690665 B CN104690665 B CN 104690665B CN 201510084675 A CN201510084675 A CN 201510084675A CN 104690665 B CN104690665 B CN 104690665B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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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 fatigue tension test double-deck fixture and mounting process, specifically
Refer to reduces holding the load that lotus fixture is undertaken in steel strand wires fatigue tension test by arranging off-loading fixture, reduces steel strand wires
Fatigue damage caused by the occlusion defect of end, and then reduce the destruction of invar twisted wire end and cause the risk of test failure.
Background technology
With the development of prestressing technique, prestressed structure is widely used in large scale structure engineering or science of bridge building.By
Frequently undergo the effect of cyclic reverse loading during service in these structures so that the fatigue behaviour research of prestressed structure becomes mesh
One big hot issue of front field of civil engineering.Currently, prestress wire fatigue test way is usually to provide in producer
Carry out on hydraulic pressure length section fixture.Slippage problems that can be with effectively solving steel strand wires in test using long section fixture, but while
Also the Clamping damage of steel strand wires end is increased, the broken end speed of steel strand wires is accelerated, success of the test probability is reduced.This
Outward, because the hardness of steel strand wires is higher, hydraulically operated fixture directly clamps steel strand wires and easily causes holder contacts face there is bite mark phenomenon,
Affect the service life of machine.In sum, the reliability of test data is not only affected using traditional experiment fixture, can be also accelerated
Testing equipment it is aging.
The content of the invention
Goal of the invention：The invention provides a kind of regular reinforcement and presstressed reinforcing steel fatigue tension test double-deck fixture and peace
Dress technique, its objective is to solve the problems, such as that the efficiency existing for conventional equipment is low inadequate with service life.
Technical scheme
The present invention is achieved through the following technical solutions：
A kind of regular reinforcement and presstressed reinforcing steel fatigue tension test with double-deck fixture, the fixture include by by off-loading fixture with
The clamp head of lotus fixture composition is held, clamp head is connected by attachment means with testing machine.
Off-loading fixture includes off-loading clip jaw, off-loading clamp base and off-loading fixture bottom；Off-loading clip jaw is arranged
On the inside of off-loading clamp base, off-loading clamp base is connected with attachment means, and off-loading fixture bottom is arranged on off-loading clamp base
The one end being connected with attachment means；It is common steel strand tension moveable anchor to hold lotus fixture, lotus clamp base and is held including holding
Lotus clip jaw, holds lotus clip jaw and is arranged on innermost layer, holds lotus clip jaw and is arranged on the inner side for holding lotus clamp base, holds lotus
Clamp base is arranged on the inner side of off-loading clamp base.
Off-loading clip jaw includes aluminium set, steel bushing and the big intermediate plate of steel taper.
The face that off-loading clamp base is contacted with off-loading clip jaw is to be adapted with the tapered slope of off-loading clip jaw
Inclined-plane, the inclination alpha on its inclined-plane takes 30 °, and aluminium set thickness Τ 2 takes 3mm, and aluminium set length L2 is not preferably less than 8mm.
Attachment means include double-deck fixture branch sleeve, connecting rod, pre-load nut one, pre-load nut two and testing machine connection
Chassis；Connecting rod one end is connected by pre-load nut one and pre-load nut two with testing machine connecting base plate, and the other end is cased with bilayer
Fixture branch sleeve；Off-loading clamp base is injected 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 connects
Female connector cylinder is concave spherical surface, and connecting rod is convex spherical, and its spherical diameter D is not less than 2m.
As mentioned above regular reinforcement and the presstressed reinforcing steel fatigue tension test mounting process of double-deck fixture, formally install it
Before need to be attached that device is installed, pretension is installed and pretension loading, its key step is as follows：
(1) installing and connecting apparatus on testing machine；
(2) pretension is installed, and auxiliary steel strand wires are fitted in clamp head first, then clamp head is installed to into attachment means
On；
(3) pretension loading, first firing test machine, with the speed of 2kN/s steel strand wires are at the uniform velocity stretched, until pulling force exceedes examination
The 20% of the design load upper limit is tested, then stops loading and holding load 5min, by tightening the He of pre-load nut one during load is held
Pre-load nut two completes pretension work, finally unloads, and removes clamp head, closes testing machine；
(4) formal test is installed, and changes auxiliary steel strand wires, and auxiliary steel strand wires are taken out first from clamp head, and is replaced with
Test steels twisted wire, then reinstalls clamp head by installation steps.
The regular reinforcement as described above and presstressed reinforcing steel fatigue tension test mounting process of double-deck fixture, it should be noted
Following 3 points：(1) off-loading clamp base outer surface thread height L1, the inner surface thread depth L3 of double-deck fixture branch sleeve and
The specification of pre-load nut one and pre-load nut two need to be that pretension load is true according to the anti-extrusion computing formula of screw thread pair by peak load
It is fixed, and require while meeting shear strength check, self-locking property and checking；
(2) the wall thickness T1 of off-loading clamp base, the double-deck wall thickness T3 of the fixture branch sleeve and diameter T5 of connecting rod according to
Peak load is determined by the axle center tensile strength formula of steel；
(3) the double-deck minimum thickness T4 of fixture branch sleeve concave spherical surface, the minimum thickness T6 of the convex spherical of connecting rod according to
Peak load is determined by the axial compression strength formula of steel.
The regular reinforcement as described above and presstressed reinforcing steel fatigue tension test mounting process of double-deck fixture, the step of the technique
It is rapid as follows：
(1) step concrete grammar is as follows：(1) connecting rod is inserted in sleeve；(2) by pre-load nut one and pre-load nut
Two screw in connecting rod；(3) using the screw thread of connecting rod, connecting rod is connected with testing machine connecting base plate.
(2) method is as follows in step：The first step, installs auxiliary steel strand wires；First, auxiliary steel strand wires are inserted in into off-loading fixture
In base；Secondly, aluminium set, steel bushing and the big intermediate plate of the steel taper composition that sequentially bonds together successively is subtracted with binding agent
Lotus clip jaw；Again, the off-loading clip jaw for pasting is fixed on into auxiliary steel strand wires outer surface using adhesive tape, afterwards
Off-loading intermediate plate is pushed into into off-loading base bottom；Finally, lotus clamp base will be held and lotus clip jaw is held and is sequentially arranged at off-loading
Intermediate plate rear end, while screw bottom is closed in off-loading clamp base by off-loading intermediate plate with holding lotus clamp base and holding lotus clip jaw
In；Second step, installs double-deck fixture；The double-deck fixture for installing steel strand wires is placed in the middle of attachment means as shown in Figure 11 and is turned
Dynamic branch sleeve, makes being threaded in sleeve for off-loading base, and double-deck fixture is connected with testing machine；
(3) step is specific as follows：(1) firing test machine, using power control mode to aiding in steel strand wires to stretch；
(2) at the uniform velocity loaded with the speed of 2kN/s, until after more than the 20% of the EXPERIMENTAL DESIGN load upper limit, stopping loading；(3) load is held
5min, during load is held, is successively tightened pre-load nut two, pre-load nut one with spanner；(4) 0kN is offloaded to, set is unclamped
The screw thread of cylinder removes double-deck fixture, is then shut off testing machine.
Advantage and effect：
The present invention provides a kind of regular reinforcement and presstressed reinforcing steel fatigue tension test double-deck fixture and mounting process, purpose
It is the service life for improving test efficiency and its extending testing machine.
Advantages of the present invention is as follows with good effect：
First, the risk of test specimen fatigue damage destruction is reduced, significantly improve success of the test probability.The Double-layer clamp of the present invention
Tool, has on the one hand shared load action in fatigue test due to increased off-loading fixture, reduces to act on and single holds lotus folder
Load on tool, effectively reduces the Clamping damage of steel strand wires end, on the other hand due to the aluminium set pair used in off-loading fixture
Steel strand wires carry out flexible clamping, improve the stress concentration phenomenon of steel strand wires at gripping, significantly improve success of the test probability；
Second, extend the service life of testing machine.The pretension mounting process of the present invention, i.e., before formal installation, even
Apply precompression on extension bar, the screw thread of testing machine terminal pad can be made all the time in pressured state, effectively prevent due to directly adding
The screw thread fatigue damage that load may cause, extends the life-span of test terminal pad.
Steel strand wires fatigue test of the present invention adopts suspension cable anchorage technology with double-deck fixture, 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.
Description of the drawings
Fig. 1 bilayer clamp head installation drawings
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 drawings
The attachment means figure of Fig. 5 bilayer fixtures
Fig. 6-1 bilayer fixture branch sleeve detail drawing
Fig. 6-2 are 6-1 top view
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 8-1 top view
Fig. 9 installation steps one (install connecting rod and double-deck fixture branch sleeve)
Figure 10 bilayer fixture installations diagram
Figure 11 installation steps two, three (pretension is installed and formal installation)
Label and symbol description
1st, off-loading clip jaw；2nd, off-loading clamp base；3rd, lotus clamp base is held；4th, lotus clip jaw is held；5th, off-loading folder
Tool bottom；6th, aluminium set；7th, steel bushing；8th, the big intermediate plate of steel taper；9th, double-deck fixture branch sleeve；10th, connecting rod；11st, pretension spiral shell
Female one；12nd, pre-load nut two；13rd, testing machine connecting base plate；14th, steel strand wires are aided in；15th, steel strand wires are tested.
L1-off-loading base outer surface thread depth；Big intermediate plate height/aluminum (copper) the set height of L2-steel taper；L3-company
The inner surface thread depth of female connector cylinder.
The wall thickness of T1-off-loading base；；Τ 2-aluminium set thickness；The wall thickness of T3-branch sleeve；T4-branch sleeve is 9. recessed
The minimum thickness of sphere；The diameter of T5-connecting rod；The minimum thickness of the convex spherical of T6-connecting rod.
D-connecting rod and connection sleeve pipe contact surface diameter；α-off-loading base inclination angle of inclined plane.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention will be further described：
As depicted in figs. 1 and 2, the present invention provides a kind of regular reinforcement and presstressed reinforcing steel fatigue tension test Double-layer clamp
Tool, the fixture includes passing through attachment means and testing machine phase with the clamp head that lotus fixture is constituted, clamp head is held by by off-loading fixture
Even.
Off-loading fixture includes off-loading clip jaw 1, off-loading clamp base 2 and off-loading fixture bottom 5；Off-loading clip jaw 1
The inner side of off-loading clamp base 2 is arranged on, off-loading clamp base 2 is connected with attachment means, off-loading fixture bottom 5 is arranged on off-loading folder
One end that tool base 2 is connected with attachment means；It is common steel strand tension moveable anchor to hold lotus fixture, including holding lotus fixture bottom
Seat 3 and holds lotus clip jaw 4, holds lotus clip jaw 4 and is arranged on innermost layer, holds lotus clip jaw 4 and is arranged on and holds lotus clamp base 3
Inner side, hold the inner side that lotus clamp base 3 is arranged on off-loading clamp base 2.
Off-loading clip jaw 1 includes the big intermediate plate 8 of aluminium set 6, steel bushing 7 and steel taper.
The face that off-loading clamp base 2 is contacted with off-loading clip jaw 1 is to be adapted with the tapered slope of off-loading clip jaw 1
Inclined-plane, the inclination alpha on its inclined-plane takes 30 °, and aluminium set thickness Τ 2 takes 3mm, and aluminium set length L2 is not preferably less than 8mm.
Attachment means include double-deck fixture branch sleeve 9, connecting rod 10, pre-load nut 1, pre-load nut 2 12 and examination
Test machine connecting base plate 13；The one end of connecting rod 10 is connected by pre-load nut 1 and pre-load nut 2 12 with testing machine connecting base plate 13
Connect, the other end is cased with double-deck fixture branch sleeve 9；Off-loading clamp base 2 is injected in double-deck fixture branch sleeve 9；Testing machine connects
Connect chassis 13 to be connected with testing machine.
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, and connecting rod 10 is convex spherical, and its spherical diameter D is not less than 2m.
This device in the design process completely using engagement thread connect, should be noted it is following some：(1) off-loading base appearance
The specification of face thread depth L1, the inner surface thread depth L3 of branch sleeve and pre-load nut one, two need to be by peak load (pretension
Load) determined according to the anti-extrusion computing formula of screw thread pair, and require while meeting shear strength check, self-locking property and checking；
(2) the diameter T5 of the wall thickness T1 of off-loading base, the wall thickness T3 of branch sleeve and connecting rod need to according to peak load by steel axle
Heart tensile strength formula determines；(3) the minimum thickness T6 of the minimum thickness T4 of the concave spherical surface of branch sleeve 9, the convex spherical of connecting rod
Need to be determined by the axial compression strength formula of steel according to peak load.
As mentioned above regular reinforcement and the presstressed reinforcing steel fatigue tension test mounting process of double-deck fixture, formally install it
Before need to be attached that device is installed, pretension is installed and pretension loading, its key step is as follows：
(1) installing and connecting apparatus on testing machine；
(2) pretension is installed, and auxiliary steel strand wires 14 are fitted in clamp head first, then clamp head is installed to into attachment means
On；
(3) pretension loading, first firing test machine, with the speed of 2kN/s steel strand wires are at the uniform velocity stretched, until pulling force exceedes examination
The 20% of the design load upper limit is tested, then stops loading and holding load 5min, by tightening pre-load nut 1 during load is held
Pretension work is completed with pre-load nut 2 12, is finally unloaded, remove clamp head, close testing machine；
(4) formal test is installed, and changes auxiliary steel strand wires, and auxiliary steel strand wires are taken out first from clamp head, and is replaced with
Test steels twisted wire, then reinstalls clamp head by installation steps 2.
The regular reinforcement as described above and presstressed reinforcing steel fatigue tension test mounting process of double-deck fixture, it should be noted
Following 3 points：(1), the outer surface thread height L1 of off-loading clamp base 2, the inner surface thread depth of double-deck fixture branch sleeve 9
The specification of L3 and pre-load nut 1 and pre-load nut 2 12 need to be pretension load according to the anti-extrusion meter of screw thread pair by peak load
Calculate formula to determine, and require while meeting shear strength check, self-locking property and checking；
(2), the diameter T5 roots 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
Determined by the axle center tensile strength formula of steel according to peak load；
(3), minimum thickness T4, the minimum thickness T6 of the convex spherical of connecting rod 10 of the double-deck concave spherical surface of fixture branch sleeve 9
Determined by the axial compression strength formula of steel according to peak load.
Referring to Fig. 1-Figure 11, enforcement figure of the steel strand wires fatigue test of the present invention shown in double-deck fixture and its mounting process
In main include double-deck grip device (Fig. 1), double-deck fixture attachment means (Fig. 5) and its mounting process (Fig. 9, Figure 11).
Concrete operations are as follows：1) installing and connecting apparatus, its step is as follows：(1) connecting rod 10 is inserted in sleeve 9；(2) will
Pre-load nut 1 and pre-load nut 2 12 are screwed in connecting rod 10；(3) using the screw thread of connecting rod 10, by connecting rod and test
Machine connecting base plate 13 is connected (referring to Fig. 9).
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
In off-loading clamp base 2；Secondly, with binding agent by the big intermediate plate 8 of aluminium set 6, steel bushing 7 and steel taper sequentially bonding successively
Off-loading clip jaw 1 is constituted together；Again, the off-loading clip jaw 1 for pasting is fixed on into auxiliary steel using adhesive tape
The outer surface of twisted wire 14, is pushed into the bottom of off-loading base 2 by off-loading intermediate plate 1 afterwards；Finally, lotus clamp base 3 will be held and lotus folder is held
Tool intermediate plate 4 be sequentially arranged at the rear end of off-loading intermediate plate 1, while screw bottom 5 by off-loading intermediate plate 1 with hold lotus clamp base 3 and hold lotus
Clip jaw 4 is closed in off-loading clamp base 2.Second step, installs double-deck fixture.The double-deck fixture of steel strand wires will be installed
(Figure 10) it is placed in as shown in Figure 11 in the middle of attachment means 5 and rotates branch sleeve 9, make off-loading base 2 is threaded into sleeve 9
In, double-deck fixture is connected with testing machine.
3) pretension loading, its step is as follows：(1) firing test machine, using power control mode to aiding in steel strand wires 14 to carry out
Stretching；(2) at the uniform velocity loaded with the speed of 2kN/s, until after more than the 20% of the EXPERIMENTAL DESIGN load upper limit, stopping loading；(3) hold
5min is carried, during load is held, is successively tightened pre-load nut 2 12, pre-load nut 1 with spanner；(4) 0kN is offloaded to, pine
Open sleeve screw thread 9. and remove double-deck fixture, be then shut off testing machine.
4) formal test is installed, and changes auxiliary steel strand wires, is taken out from fixture, is replaced with test steels twisted wire, its installation
Step installs 2) identical with pretension.
The present invention is advantageous in that relative to the hydraulically operated fixture of classic fatigue test：First, reduce test specimen fatigue damage
The risk of destruction, improves success of the test probability.Due to traditional experiment fixture be realized using the gmatjpdumamicss produced by biting teeth it is right
The clamping action of steel strand wires, but this method of clamping can cause bite mark phenomenon to the retaining part of steel strand wires, especially in fatigue
In test, bite mark depth gradually increases with the increase of times of fatigue, so that there is phenomenon of rupture in steel strand wires end, causes
Fatigue test fails.According to above-mentioned experimental phenomena, double-deck fixture proposed by the invention is mainly shared by off-loading fixture
Fractional load suffered by lotus fixture is held, while also steel strand wires can be produced with flexible gripping by arranging smooth aluminium set in off-loading intermediate plate
Effect, can so substantially reduce the Clamping damage of steel strand wires end, significantly improve the chance of success of fatigue test.Secondth, prolong
The service life of testing machine is grown.The pretension mounting process of the present invention, i.e., before formal installation, apply precompressed in connecting rod
Power, can make the screw thread of testing machine terminal pad all the time in pressured state, effectively prevent the spiral shell due to being loaded directly into causing
Stricture of vagina fatigue damage, extends the life-span of test terminal pad.3rd, reduces cost.Conventional hydraulic fixture need to be special by testing machine producer
Door customization, and fixture introduces hydraulic control, while fatigue test is also more serious to the damage of fixture, therefore, experimentation cost with
Maintenance cost is higher.The present invention can both substantially reduce purchase only by the collective effect for holding lotus fixture and off-loading fixture
Test equipment equipment needed thereby funds, can reduce steel strand wires to maintenance cost produced by holding the damage of lotus fixture again, reach very well
Economic benefit.
Claims (8)
1. a kind of regular reinforcement and presstressed reinforcing steel fatigue tension test are with double-deck fixture, it is characterised in that：The fixture is included by subtracting
Lotus fixture is connected by attachment means with the clamp head for holding lotus fixture composition, clamp head with testing machine；
Off-loading fixture includes off-loading clip jaw (1), off-loading clamp base (2) and off-loading fixture bottom (5)；Off-loading clip jaw
(1) off-loading clamp base (2) inner side is arranged on, off-loading clamp base (2) is connected with attachment means, and off-loading fixture bottom (5) sets
Put the one end being connected with attachment means in off-loading clamp base (2)；It is common steel strand tension moveable anchor to hold lotus fixture, bag
Include 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) inner side for holding lotus clamp base (3) is arranged on, the inner side that lotus clamp base (3) is arranged on off-loading clamp base (2) is held.
2. regular reinforcement according to claim 1 and presstressed reinforcing steel fatigue tension test are with double-deck fixture, it is characterised in that：
Off-loading clip jaw (1) includes aluminium set (6), steel bushing (7) and the big intermediate plate of steel taper (8).
3. regular reinforcement according to claim 2 and presstressed reinforcing steel fatigue tension test are with double-deck fixture, it is characterised in that：
The face that off-loading clamp base (2) is contacted with off-loading clip jaw (1) is to be adapted with the tapered slope of off-loading clip jaw (1)
Inclined-plane, the inclination alpha on its inclined-plane takes 30 °, and aluminium set thickness (T2) takes 3mm, and aluminium set length (L2) is not preferably less than 8mm.
4. regular reinforcement according to claim 2 and presstressed reinforcing steel fatigue tension test are with double-deck fixture, it is characterised in that：
Attachment means include double-deck fixture branch sleeve (9), connecting rod (10), pre-load nut one (11), pre-load nut two (12) and examination
Test machine connecting base plate (13)；Connecting rod (10) one end is connected by pre-load nut one (11) and pre-load nut two (12) with testing machine
Chassis (13) connects, and the other end is cased with double-deck fixture branch sleeve (9)；Off-loading clamp base (2) injects double-deck fixture adapter sleeve
In cylinder (9)；Testing machine connecting base plate (13) is connected with testing machine.
5. regular reinforcement according to claim 4 and presstressed reinforcing steel fatigue tension test are with double-deck fixture, it is characterised in that：
Contact surface between double-deck fixture branch sleeve (9) and connecting rod (10) is sphere, and spheric curvature is identical, double-deck fixture connection
Sleeve (9) is concave spherical surface, and connecting rod (10) is convex spherical, and its spherical diameter D is not less than 2m.
6. the regular reinforcement as claimed in claim 1 and presstressed reinforcing steel fatigue tension test mounting process of double-deck fixture, it is special
Levy and be：Need to be attached device installation, pretension installation and pretension loading before formal installation, its key step is as follows：
(1) installing and connecting apparatus on testing machine；
(2) pretension is installed, and during steel strand wires (14) will be aided in be fitted into clamp head first, then clamp head is installed to into attachment means
On；
(3) pretension loading, first firing test machine, at the uniform velocity stretch steel strand wires, until pulling force sets more than test with the speed of 2kN/s
Meter the load upper limit 20%, then stop load and hold load 5min, hold carry during by tighten pre-load nut one (11) and
Pre-load nut two (12) completes pretension work, finally unloads, and removes clamp head, closes testing machine；
(4) formal test is installed, and changes auxiliary steel strand wires, and auxiliary steel strand wires are taken out first from clamp head, and is replaced with test
With steel strand wires, then clamp head is reinstalled by installation steps (2).
7. the regular reinforcement according to claim 6 and presstressed reinforcing steel fatigue tension test mounting process of double-deck fixture,
It is characterized in that：
(1) off-loading clamp base (2) outer surface thread height (L1), the inner surface thread depth of double-deck fixture branch sleeve (9)
And the specification of pre-load nut one (11) and pre-load nut two (12) need to be that pretension load resists according to screw thread pair by peak load (L3)
Extruding computing formula determines, and requires while meeting shear strength check, self-locking property and checking；
(2) diameter 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
(T5) determined by the axle center tensile strength formula of steel according to peak load；
(3) minimum thickness (T4), the minimum thickness of the convex spherical of connecting rod (10) of double-deck fixture branch sleeve (9) concave spherical surface
(T6) determined by the axial compression strength formula of steel according to peak load.
8. the regular reinforcement according to claim 6 and presstressed reinforcing steel fatigue tension test mounting process of double-deck fixture,
It is characterized in that：The step of technique, is as follows：
(1) step concrete technology is as follows：(1) connecting rod (10) is inserted in sleeve (9)；(2) by pre-load nut one (11) and
Pre-load nut two (12) is screwed in connecting rod (10)；(3) using the screw thread of connecting rod (10), connecting rod is connected with testing machine
Chassis (13) is connected；
(2) technique is as follows in step：The first step, installs auxiliary steel strand wires (14)；First, auxiliary steel strand wires (14) is inserted in into off-loading
In clamp base (2)；Secondly, with binding agent by aluminium set (6), steel bushing (7) and the big intermediate plate of steel taper (8) sequentially successively
Bond together composition off-loading clip jaw (1)；Again, it is using adhesive tape that the off-loading clip jaw (1) for pasting is fixed
In auxiliary steel strand wires (14) outer surface, afterwards off-loading intermediate plate (1) is pushed into into off-loading base (2) bottom；Finally, lotus fixture will be held
Base (3) and hold lotus clip jaw (4) and be sequentially arranged at off-loading intermediate plate (1) rear end, while screw off-loading fixture bottom (5) will subtract
Lotus intermediate plate (1) is closed in off-loading clamp base (2) with holding lotus clamp base (3) and holding lotus clip jaw (4)；Second step, peace
The double-deck fixture of dress；The double-deck fixture for installing steel strand wires is placed in the middle of attachment means and branch sleeve (9) is rotated, off-loading bottom is made
Being threaded in sleeve (9) for seat (2), double-deck fixture is connected with testing machine；
(3) step is specific as follows：(1) firing test machine, using power control mode to aiding in steel strand wires (14) to stretch；
(2) at the uniform velocity loaded with the speed of 2kN/s, until after more than the 20% of the EXPERIMENTAL DESIGN load upper limit, stopping loading；(3) load is held
5min, during load is held, is successively tightened pre-load nut two (12), pre-load nut one (11) with spanner；(4) it is offloaded to
0kN, the screw thread for unclamping sleeve (9) removes double-deck fixture, is then shut off testing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104690665A CN104690665A (en) | 2015-06-10 |
| CN104690665B true CN104690665B (en) | 2017-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510084675.3A Expired - Fee Related 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 |
Country Status (1)
| Country | Link |
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| CN105508357B (en) * | 2015-12-22 | 2018-06-12 | 湖南大学 | It is a kind of to reduce the axially eccentric assembling device of tensile test specimen and operating 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 |
| CN114965025B (en) * | 2022-05-13 | 2023-04-14 | 哈尔滨工业大学 | Test fixture for nondestructive compression test of double-layer hollow thin plate |
| 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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| CN87205634U (en) * | 1987-03-25 | 1988-03-16 | 西南交通大学 | Clamping apparatus for reinforcing bar fatigue test |
| CN201320727Y (en) * | 2008-12-21 | 2009-10-07 | 大庆油田有限责任公司 | Assembly device for PCCP pipelines |
| CN201331464Y (en) * | 2008-12-30 | 2009-10-21 | 江阴法尔胜钢铁制品有限公司 | Circular fixture for prestress steel strand detection |
| CN202705897U (en) * | 2012-07-06 | 2013-01-30 | 安徽金星预应力工程技术有限公司 | High strength low retracting anchorage device |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT412564B (en) * | 2003-12-22 | 2005-04-25 | Burtscher Stefan L Dipl Ing Dr | Anchoring for pre-tensioned and/or stressed tensile elements comprises a wedge and anchoring body formed by at least two wedge-shaped layers lying over each other |
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| CN87205634U (en) * | 1987-03-25 | 1988-03-16 | 西南交通大学 | Clamping apparatus for reinforcing bar fatigue test |
| CN201320727Y (en) * | 2008-12-21 | 2009-10-07 | 大庆油田有限责任公司 | Assembly device for PCCP pipelines |
| CN201331464Y (en) * | 2008-12-30 | 2009-10-21 | 江阴法尔胜钢铁制品有限公司 | Circular fixture for prestress steel strand detection |
| CN202705897U (en) * | 2012-07-06 | 2013-01-30 | 安徽金星预应力工程技术有限公司 | High strength low retracting anchorage device |
| 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 |
| 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 |
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