CN108548713A - A kind of amendable mobile test device and its test method - Google Patents
A kind of amendable mobile test device and its test method Download PDFInfo
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- CN108548713A CN108548713A CN201810268811.8A CN201810268811A CN108548713A CN 108548713 A CN108548713 A CN 108548713A CN 201810268811 A CN201810268811 A CN 201810268811A CN 108548713 A CN108548713 A CN 108548713A
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- reinforcing bar
- groove
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- movable chuck
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- G—PHYSICS
- 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
- G01N3/02—Details
Abstract
The present invention relates to a kind of amendable mobile test device and its test methods.The device includes universal testing machine, universal testing machine includes the upper grip for fixing the first reinforcing bar vertically and the vertical lower collet for fixing the second reinforcing bar, upper and lower collet includes fixed chuck and movable chuck, movable chuck is mounted on the inside of fixed chuck, the installation region of reinforcing bar is constituted on the inside of movable chuck, fixed chuck is equipped with and carries out mobile track for movable chuck, the length direction of track and reinforcing bar it is axially vertical.The invention enables upper and lower collets when in use, can not only reinforcing bar be driven to move in above-below direction, reinforcing bar can also be driven to be moved in front-rear direction, the first clamped reinforcing bar and the second reinforcing bar is allow to keep axially coincident, so that reinforcement installation process more lightly facilitates, test efficiency is improved, while being also conducive to improve the accuracy of bar connecting performance test.The present invention to the amendment of test data by obtaining more accurate bar connecting performance curve.
Description
Technical field
The invention belongs to field of civil engineering, it is specifically related to a kind of amendable mobile test device and its experiment side
Method.
Background technology
In recent years, with the fast development of China's urban construction, general industry and civil buildings, high level and Super High are built
It builds, civil air defense constructions and installations and town road construction scale constantly expand so that it is increasing to the demand of reinforcing bar, and certainly for reinforcing bar
The quality requirement of body is also higher and higher, while in order to ensure safety and the durability of building, for the switching performance between reinforcing bar
Equal detections also become particularly important, such as binding, welding, sleeve connection.Switching performance test when being bound for reinforcing bar, existing rank
The universal testing machine of section can only be accomplished when detecting by two independent reinforcing bar bindings together, but can not be fixed on same axis
On line (as shown in Figure 1, 2), due to installation site of the reinforcing bar in upper grip and lower collet fix and upper grip and lower collet without
Method carries out position adjustment, therefore causes the error of test result and actual conditions larger.
For the curve of bar connecting performance test results output at present there are larger error, the reason of causing these errors, is more
It is kind various, such as two reinforcing bars dislocation put, it is end reinforced exist during force sliding etc. can not antigen because.These factors
Generated error can be embodied directly on the curve of final output so that related personnel can not be directly and accurate when observing curve
True recognizes compared with bar connecting performance.
Invention content
In order to solve the above technical problem, the present invention provides a kind of amendable mobile test device and its experiment sides
Method.
In order to achieve the object of the present invention, present invention employs following technical schemes：
A kind of amendable mobile test device, including universal testing machine, the universal testing machine include vertical fixed
The upper grip of first reinforcing bar and the vertical lower collet for fixing the second reinforcing bar, the upper grip, lower collet include fixed chuck
And movable chuck, the movable chuck are mounted on the inside of fixed chuck, and the installing zone of reinforcing bar is constituted on the inside of the movable chuck
Domain, the fixed chuck is equipped with to carry out mobile and makes first reinforcing bar and the second reinforcing bar axially weight for the movable chuck
The track of conjunction, the length direction of the track and reinforcing bar it is axially vertical.
Further technical solution, the fixed chuck medial surface offers the track of the first groove composition, described
First groove medial surface offers the second groove, and first groove is parallel with the second groove length direction, the movable chuck
Lateral surface is equipped with the hollow rib coincide with the first groove grafting and movable chuck is driven to be moved along the track, described convex
Edge side is equipped with threaded hole corresponding with second groove, and the movable chuck is inserted by bolt from the flange inner successively
Enter the threaded hole, second groove and be fixedly connected with the fixed chuck to realize, the bolt and the second groove are tight
With with.
Further technical solution, first groove, the second groove are square groove, the both sides cell wall of first groove
It is upper to offer second groove respectively；The flange is respectively equipped with institute on the face opposite with the both sides cell wall of the first groove
State threaded hole.
Further technical solution, the mobile test device further include data acquisition unit and data processing and show
Show that unit, the universal testing machine signal output end are connect with the data acquisition unit signal receiving end, the data acquisition
The signal output end of unit is connect with the signal receiving end of the data processing and display unit.
Further technical solution, the movable chuck are equipped with convenient for human hand push-and-pull driving movable chuck along the track
Mobile handrail.
A kind of test method based on the mobile test device, includes the following steps：
Step 1, the first reinforcing bar is fixed on upper grip, the second reinforcing bar is fixed on lower collet；
Step 2, movable chuck is made to be moved along track until the first reinforcing bar and the second reinforcing bar are in same axis；
Step 3, movable chuck and fixed chuck are fixedly connected by bolt；
Step 4, switching performance test is carried out after the first reinforcing bar and the binding of the second reinforcing bar, is collected and is tried by data acquisition unit
Data are tested, the test data is modified with display unit finally by data processing, to obtain required curve F- Δs；
The modification method includes the following steps：
Step 4-1 converts the test data to curve F '-Δ ', wherein F ' is the axial load applied to reinforcing bar,
Δ ' be reinforcing bar displacement, Δ is indicated with x-axis in coordinate system ', y-axis expression F '；
Step 4-2, using the maximum value F ' max of F ' as referential data, with F '=﹝ 40%F ' max, 70%F ' max ﹞ for section
In curve the F '-Δ ' on equidistantly choose n point, and calculate the slope k i for obtaining each point, n=4~6 successively；
Step 4-3 calculates slope average value as follows：
Step 4-4, using ka as slope, does straight line and is met at a bit with x-axis using F '=55%F ' max as intermediate point, this
The abscissa of point is slippage Δs；
0, the 55%F ' sections max ﹞ F '=﹝ are modified to using ka as slope and cross the straightway of origin, F '=﹝ by step 4-5
It is Δ=Δ '-Δ that curved section behind the sections 55%F ' max, F ' max ﹞, which is modified to abscissa,s, ordinate is still F=F '；
Step 4-6 finally obtains the F- Δ curves being corrected.
The beneficial effects of the present invention are：
1) present invention constitutes upper grip and lower collet in the form of fixed chuck, movable chuck combination so that upper folder
Head and lower collet when in use, can not only drive reinforcing bar is mobile in above-below direction to adjust, reinforcing bar can also be driven front and back
Direction movement is adjusted so that clamped the first reinforcing bar and the second reinforcing bar can keep axially coincident so that reinforcement installation mistake
Cheng Gengwei lightly facilitates, and improves test efficiency, while being also conducive to improve the accuracy of bar connecting performance test.
2) movable chuck of the present invention is made up of flange in the first groove gliding in tracks simultaneously realizes front-rear direction with this
Movement, the track and ledge surface are smooth, it is possible to reduce the frictional force in moving process.Geometrical clamp of the present invention
Head, movable chuck are convenient for being fixedly connected and dismantle, when reinforcing bar is clamped and the movable chuck is moved to the first reinforcing bar, the second steel
After muscle is axially coincident, the threaded hole, second groove from the flange inner are sequentially inserted by bolt to realize and institute
Being fixedly connected for fixed chuck is stated, which to may insure that dislocation, sliding will not occur for reinforcing bar during the test
And situations such as falling off, that is, it is firm to connect.
3) heretofore described movable chuck is equipped with handrail, convenient for users to the movement movable fixture, and is more conducive to
Positioning.
4) in test method of the present invention include error correction for test data, collect after data by analyzing simultaneously
Error component is corrected, finally directly output greatly improves the standard of test result compared with the more accurate F- Δs curve of virgin curve
True property.Test method of the present invention is easily understood, and is conducive to the operation of user.
Description of the drawings
Fig. 1 is the mounting structure schematic diagram of reinforcing bar in existing universal testing machine.
Fig. 2 is the lateral plan of reinforcing bar in Fig. 1.
Fig. 3 is upper grip, lower chuck structure schematic diagram.
Fig. 4 is upper grip sectional perspective structural schematic diagram.
Fig. 5 is the mounting structure schematic diagram of reinforcing bar in universal testing machine of the present invention.
Fig. 6 is the amendable mobile test device structural schematic diagram of the present invention.
Fig. 7 is curve F '-Δ before correcting ' schematic diagram.
Fig. 8 is the schematic diagram of curve F- Δs after correcting.
The meaning marked in attached drawing is as follows：
Collet 10- fixed chucks 11- the first groove the second grooves of 12- under a- upper grips b-
20- movable chuck 21- flange 22- threaded hole 23- handrail 30- data acquisition units
40- data processings and display unit 51- the first reinforcing bar the second reinforcing bars of 52-
Specific implementation mode
More specific detail is made to technical solution of the present invention with reference to embodiment：
As shown in Fig. 3,4,5：Amendable mobile test device of the present invention includes universal testing machine, described omnipotent
Testing machine includes the upper grip a and the vertical lower collet b for fixing the second reinforcing bar for fixing the first reinforcing bar vertically, the upper grip a,
Lower collet b includes fixed chuck 10 and movable chuck 20, and the movable chuck 20 is mounted on 10 inside of fixed chuck, described
20 inside of movable chuck constitutes the installation region of reinforcing bar, and the fixed chuck 10 is equipped with to be moved for the movable chuck 20
And the track for making first reinforcing bar and the second reinforcing bar axially coincident, the length direction of the track and the axial direction of reinforcing bar are vertical
Directly.
The present invention constitutes upper grip a and lower collet b in the form of fixed chuck 10, movable chuck 20 combine so that
Upper grip a and lower collet b when in use, can not only drive reinforcing bar is mobile in above-below direction to adjust, can also drive reinforcing bar
It moves and adjusts in front-rear direction so that clamped the first reinforcing bar and the second reinforcing bar can keep axially coincident so that reinforcing bar
Installation process more lightly facilitates, and improves test efficiency, while being also conducive to improve the accuracy of bar connecting performance test.
10 medial surface of the fixed chuck offers the track of the first groove 11 composition, first groove, 11 inside
Face offers the second groove 12, and first groove 11 is parallel with 12 length direction of the second groove, 20 outside of the movable chuck
Face is equipped with the hollow rib 21 coincide with 11 grafting of the first groove and movable chuck 20 is driven to be moved along the track, described
21 side of flange is equipped with threaded hole 22 corresponding with second groove 12, and the movable chuck 20 is by bolt from the flange
21 insides are sequentially inserted into the threaded hole 22, second groove 12 and are fixedly connected with the fixed chuck 10 to realize, institute
State bolt and 12 close-fitting of the second groove and, the diameter of the bolt is slightly larger than the width of second groove 12.
First groove 11, the second groove 12 are square groove, are opened up respectively on the both sides cell wall of first groove 11
There is second groove 12；The flange 21 is respectively equipped with the spiral shell on the face opposite with the both sides cell wall of first groove 11
Pit 22.
Gliding in tracks that movable chuck 20 of the present invention is made up of flange 21 in the first groove 11 is simultaneously realized front and back with this
The movement in direction, the track and 21 surface of flange are smooth, it is possible to reduce the frictional force in moving process.It is of the present invention solid
Clamp head 10, movable chuck 20 are convenient for being fixedly connected and dismantle, when reinforcing bar is clamped and the movable chuck is moved to the first steel
After muscle, the second reinforcing bar are axially coincident, the threaded hole 22, described second recessed is sequentially inserted into from the inside of the flange 21 by bolt
Slot 12 is fixedly connected to realize with the fixed chuck 10, which to may insure reinforcing bar not during the test
Situations such as misplacing, slide and falling off, that is, it is firm to connect.
The movable chuck 20 is equipped with the handrail 23 moved along the track convenient for human hand push-and-pull driving movable chuck 20.
Heretofore described movable chuck is equipped with handrail, convenient for users to the movement movable fixture, and is more conducive to position.
As shown in Figure 5：The mobile test device further includes that data acquisition unit 30 and data processing and display are single
Member 40, the universal testing machine signal output end is connect with 30 signal receiving end of the data acquisition unit, the data acquisition
The signal output end of unit 30 is connect with the data processing with the signal receiving end of display unit 40.I.e. by data processing with
The data-signal that data acquisition unit 30 acquires is processed into required curve and exported by display unit 40.
The present invention is based on the test methods of above-mentioned mobile test device to include the following steps：
Step 1, the first reinforcing bar is fixed on upper grip a, the second reinforcing bar is fixed on lower collet b；
Step 2, movable chuck 20 is made to be moved along track until the first reinforcing bar and the second reinforcing bar are in same axis；
Step 3, movable chuck 20 and fixed chuck 10 are fixedly connected by bolt；
Step 4, switching performance test is carried out after the first reinforcing bar and the binding of the second reinforcing bar, is collected by data acquisition unit 30
Test data is modified the test data with display unit 40 finally by data processing, to obtain required curve
F-Δ；
The modification method includes the following steps：
Step 4-1 converts the test data to curve F '-Δ as shown in Figure 7 ', wherein F ' is to apply to reinforcing bar
Axial load, Δ ' be reinforcing bar displacement, Δ is indicated with x-axis in coordinate system ', y-axis expression F '；
Step 4-2, using the maximum value F ' max of F ' as referential data, the coordinates of F ' max points be (16.93963,
176.57023), with F '=﹝ 40%F ' max, 70%F ' max ﹞ be section in curve the F '-Δ ' on equidistantly choose 5 points；
(7.91892,70.63265), (8.63515,83.86981), (9.35414,97.11991), (10.13451,
110.36763), (10.83914,123.5826), and the slope for obtaining each point is calculated successively：K1=18.48171677, k2=
18.42876813 k3=16.9762036, k4=18.75448108, k5=11.4015134
Step 4-3 calculates slope average value as follows：Ka=16.8085366；
Step 4-4, using ka as slope, does straight line and is met at a bit with x-axis using F '=55%F ' max as intermediate point, this
The abscissa of point is slippage Δs=3.576128961；
0, the 55%F ' sections max ﹞ F '=﹝ are modified to using ka as slope and cross the straightway of origin, F '=﹝ by step 4-5
It is Δ=Δ '-Δ that curved section behind the sections 55%F ' max, F ' max ﹞, which is modified to abscissa,s, ordinate is still F=F '；
Step 4-6 finally obtains the F- Δ curves as shown in Figure 8 being corrected.
Claims (6)
1. a kind of amendable mobile test device, including universal testing machine, the universal testing machine includes vertical fixing the
The upper grip (a) of one reinforcing bar and the vertical lower collet (b) for fixing the second reinforcing bar, it is characterised in that：The upper grip (a), under
Collet (b) includes fixed chuck (10) and movable chuck (20), and the movable chuck (20) is mounted on fixed chuck (10)
Inside, movable chuck (20) inside constitute the installation region of reinforcing bar, and the fixed chuck (10), which is equipped with, supplies the movement
Collet (20) carries out mobile and makes first reinforcing bar and the axially coincident track of the second reinforcing bar, the length direction of the track
It is axially vertical with reinforcing bar.
2. amendable mobile test device as described in claim 1, it is characterised in that：On the inside of the fixed chuck (10)
Face offers the track of the first groove (11) composition, and the first groove (11) medial surface offers the second groove (12),
First groove (11) is parallel with the second groove (12) length direction, and movable chuck (20) lateral surface is equipped with and described the
The hollow rib (21) that one groove (11) grafting coincide and movable chuck (20) is driven to be moved along the track, the flange (21)
Side is equipped with threaded hole (22) corresponding with the second groove (12), and the movable chuck (20) is by bolt from the flange
(21) inside is sequentially inserted into the threaded hole (22), second groove (12) to realize the fixation with the fixed chuck (10)
Connection, the bolt and the second groove (12) close-fitting and.
3. amendable mobile test device as claimed in claim 2, it is characterised in that：First groove (11),
Two grooves (12) are square groove, and second groove (12) is offered respectively on the both sides cell wall of first groove (11)；Institute
It states and is respectively equipped with the threaded hole (22) on flange (21) face opposite with the both sides cell wall of the first groove (11).
4. amendable mobile test device as described in claim 1, it is characterised in that：The mobile test device is also
Including data acquisition unit (30) and data processing and display unit (40), the universal testing machine signal output end with it is described
Data acquisition unit (30) signal receiving end connects, signal output end and the data processing of the data acquisition unit (30)
It is connect with the signal receiving end of display unit (40).
5. amendable mobile test device as described in claim 1, it is characterised in that：It is set on the movable chuck (20)
There is the handrail (23) moved along the track convenient for human hand push-and-pull driving movable chuck (20).
6. a kind of test method based on the amendable mobile test device of Claims 1 to 5 any one of them, feature
It is：Include the following steps：
Step 1, the first reinforcing bar is fixed on upper grip (a), the second reinforcing bar is fixed on lower collet (b)；
Step 2, movable chuck (20) is made to be moved along track until the first reinforcing bar and the second reinforcing bar are in same axis；
Step 3, movable chuck (20) and fixed chuck (10) are fixedly connected by bolt；
Step 4, switching performance test is carried out after the first reinforcing bar and the binding of the second reinforcing bar, is collected and is tried by data acquisition unit (30)
Data are tested, the test data is modified finally by data processing and display unit (40), to obtain required curve
F-Δ；
The modification method includes the following steps：
Step 4-1 converts the test data to curve F '-Δ ', wherein F ' is the axial load applied to reinforcing bar, Δ ' be
The displacement of reinforcing bar indicates Δ with x-axis in coordinate system ', y-axis indicates F '；
Step 4-2 is section in institute with F '=﹝ 40%F ' max, 70%F ' max ﹞ using the maximum value F ' max of F ' as referential data
State curve F '-Δ ' on equidistantly choose n point, and calculate successively obtain each point slope k i (i=1,2,3 ..., n), n=4~
6；
Step 4-3 calculates slope average value as follows：
Step 4-4, using ka as slope, does straight line and is met at a bit with x-axis using F '=55%F ' max as intermediate point, this point
Abscissa is slippage Δs；
0, the 55%F ' sections max ﹞ F '=﹝ are modified to using ka as slope and cross the straightway of origin, F '=﹝ 55% by step 4-5
It is Δ=Δ '-Δ that curved section behind the sections F ' max, F ' max ﹞, which is modified to abscissa,s, ordinate is still F=F '；
Step 4-6 finally obtains the F- Δ curves being corrected.
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| CN108548713B (en) | 2022-10-04 |
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