CN208607136U - Test the experimental rig of major diameter double limb reinforcing bars and Concrete Bond Strength - Google Patents
Test the experimental rig of major diameter double limb reinforcing bars and Concrete Bond Strength Download PDFInfo
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- CN208607136U CN208607136U CN201820487470.9U CN201820487470U CN208607136U CN 208607136 U CN208607136 U CN 208607136U CN 201820487470 U CN201820487470 U CN 201820487470U CN 208607136 U CN208607136 U CN 208607136U
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- 238000012360 testing method Methods 0.000 title claims abstract description 133
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 71
- 239000004567 concrete Substances 0.000 title claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 230000004308 accommodation Effects 0.000 claims abstract description 8
- 210000003205 muscle Anatomy 0.000 claims description 4
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 239000011374 ultra-high-performance concrete Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000003776 cleavage reaction Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 150000002738 metalloids Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000007586 pull-out test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses the experimental rigs of a kind of test major diameter double limb reinforcing bars and Concrete Bond Strength, its test specimen includes double limb reinforcing bars outside concrete block and stretching concrete block, it is characterized in that the experimental rig includes upper plate, lower plate, upper plate is connect with lower plate by screw rod, and the test specimen main body accommodation space that can be placed in concrete block is formed between upper plate and lower roof plate；The upper plate is equipped with top load bar, and the top load bar is for being clamped at the top of testing machine；Lower plate opens up test specimen reinforced steel bar perforation, and concrete block is placed in test specimen main body accommodation space, after double limb reinforcing bars of test specimen lower end are passed through the test specimen reinforced steel bar perforation, and double limb reinforcing bars lower end of the lower fixture clamping test pieces using testing machine.The utility model is easy to operate, test it is convenient, it can be achieved that major diameter double limb reinforcing bars and Concrete Bond Strength test, convenient for promoting the use of.
Description
Technical field
The utility model belongs to material property testing field, and in particular to a kind of double limb reinforcing bars of test major diameter and concrete
The experimental rig and method of adhesion strength.
Background technique
Prefabricated bridge structure have construct it is convenient, quality is stable, it is small to environment and traffic impact, it is good energy conservation with
The advantages that environmentally friendly, has become one of the Main Trends of The Development of world's bridge structure at present.Ultra-high performance concrete is super due to having
The advantages that high compressive strength, superelevation tensile strength, metalloid deformation characteristic, superelevation durability, good workability, using this
It is one of principal mode that bridge substructure is connect that material connection Precast Pier Columns are increasingly becoming with cushion cap, bent cap.
The adhesion strength of ultra-high performance concrete and reinforcing bar is its basic mechanical characteristics, may be used to determine reinforcing bar in superelevation
Anchorage length and the lap of splice in performance concrete, and then can determine the connection joint size of Precast Pier Columns and cushion cap, bent cap,
It has great significance in engineering practice.
Currently, having done more research to the bonding strength test of minor diameter list limb reinforcing bar and normal concrete both at home and abroad.
Sample dimensions are the cube of 150mm, and used reinforcing bar is minor diameter list limb reinforcing bar (diameter 12mm ~ 20mm).And bridge pier
The building structure of the form of reinforcement of column and routine makes a big difference, due to the needs of stress, the vertical muscle diameter of bridge pier column compared with
(generally 32mm) greatly, and double limb reinforcing bars are relatively conventional.Preliminary studies have shown that due to ultra-high performance concrete adhesion strength compared with
The anchorage length of height, double limb reinforcing bars and ultra-high performance concrete is between 6d ~ 9d.Therefore, when anchorage length is 6d (with 32mm
It is 192mm for reinforcing bar), original sample dimensions and universal testing machine have been not suitable for.Simultaneously original experimental rig no matter
Device height, intensity, rigidity are not applicable, are hinged between upper part load bar and upper plate using universal, and stress is also simultaneously
Unevenly, the small sircle hole that lower plate is opened also is unfavorable for double limb reinforcing bars and passes through.
Therefore it need to specially be set for the experimental rig and method of the double limb reinforcing bars of test major diameter and Concrete Bond Strength
Meter, accurately to test its adhesion strength.
Utility model content
The purpose of this utility model is that design a kind of simple structure, double limb reinforcing bars of the test major diameter of convenient test and mixed
The experimental rig of solidifying soil adhesion strength.
To achieve the above object, the technical solution of the utility model is as follows: a kind of double limb reinforcing bars of test major diameter and coagulation
The experimental rig of native adhesion strength, test specimen include double limb reinforcing bars outside concrete block and stretching concrete block, it is characterised in that
The experimental rig includes upper plate, and lower plate, upper plate is connect with lower plate by screw rod, between upper plate and lower roof plate
Form the test specimen main body accommodation space that can be placed in concrete block；The upper plate is equipped with top load bar, the top load
Bar is for being clamped at the top of testing machine；Lower plate opens up test specimen reinforced steel bar perforation, and concrete block is placed in test specimen main body accommodation space,
After double limb reinforcing bars of test specimen lower end are passed through the test specimen reinforced steel bar perforation, and double limb steel of the lower fixture clamping test pieces using testing machine
Muscle lower end.
Further, the joint face of the top load bar and upper plate is spherical surface, is suitable for test machine clamping direction
Deviation, and keep stress more uniform.
Further, the test specimen reinforced steel bar perforation of the lower plate is the flat round hole for being provided with lower plate center, big to adapt to
The double limb reinforcing bars of diameter pass through, while aperture should not be too big, avoid weakening lower plate too many.
Further, upper plate and bottom plate spacing are preferably 440 ~ 460mm, meet test specimen obliquely through minimum it is high
Degree.
Further, implosion guard shield is installed with guarantee test safety around the experimental rig.
Further, the test specimen includes the cuboid concrete block of 350 mm of 250mm*250 mm *, the cuboid
Double limb reinforcing bars of diameter 32mm are equipped in concrete block, double limb reinforcing bars lower part is loading end, and top is free end, wherein
Lower part extension elongation is 240mm, and the upper plate and lower plate that top extension elongation is experimental rig described in 30mm are having a size of 400mm
× 280mm × 60mm, to guarantee the strength and stiffness of device.
Further, the testing machine uses universal testing machine, and load range is not less than 1500kN, vertical to stretch space not
Less than 900mm, the lower fixture of the testing machine clamps double limb reinforcing bars using steel plate fixture.
Technical solution advantage provided by the utility model are as follows:
(1) experimental rig size used by the utility model can meet the upper limit (double limb steel of diameter 32mm of the test
Muscle, anchorage length 9d), it is suitable for the bar diameter of test and the variation of anchorage length, reaches test objective.
(2) joint face between experimental rig upper plate and top load bar used by the utility model is spherical surface, can
Adequacy test machine clamps the deviation in direction, keeps stress more uniform.
(3) experimental rig lower plate used by the utility model opens flat round hole and is suitable for the demand that double limb reinforcing bars pass through,
It can conveniently make test specimen is oblique to be put into device simultaneously.
(4) universal testing machine parameter used by the utility model can meet the double limb reinforcing bar pull-out tests of major diameter and vertically draw
The demand in space is stretched, provides condition for the implementation of the test.
(5) experimental rig and test method of major diameter provided by the utility model double limb reinforcing bars and Bond Performance Between Concrete
Easy to operate, it is convenient to test, safe and reliable, convenient for promoting the use of.
Detailed description of the invention
Fig. 1 is the test specimen signal of a kind of double limb reinforcing bars of major diameter provided by the utility model and Concrete Bond Strength test
Figure.
Fig. 2 is provided by the utility model a kind of for measuring the test of major diameter double limb reinforcing bars and Concrete Bond Strength
Device and universal testing machine schematic diagram.
In figure: 1 is concrete, and 2 be major diameter pair limb reinforcing bars, and 3 be test specimen, and 4 be top load bar, and 5 be upper plate, and 6 are
Lower plate, 7 be connecting screw, and 8 be bolt, and 9 be implosion guard shield, and 10 be contact spherical surface, and 11 be universal testing machine, and 12 be ten thousand
It can testing machine downside steel plate fixture.
Specific embodiment
Below according to FIG. 1 to FIG. 2, the preferred embodiment of the utility model is illustrated.
Fig. 1 is the test specimen signal of a kind of double limb reinforcing bars of major diameter provided by the utility model and Concrete Bond Strength test
Figure, as shown, the test specimen includes the cuboid concrete block of 350 mm of 250mm*250 mm *, the cuboid coagulation
Double limb reinforcing bars of diameter 32mm, the PVC of double limb reinforcing bars and the bottom setting 35mm long of cuboid concrete block are equipped in soil block
Casing off reinforcing bar and concrete, double limb reinforcing bars lower part are loading end, and top is free end, and middle and lower part extension elongation is
240mm, top extension elongation are 30mm.
The experimental rig of the utility model is considered as following technical problem:
(1) anchorage length of the double limb reinforcing bars (diameter 32mm) of major diameter can reach 288mm in 9d, and in order to prevent
Test specimen cleavage fracture, protective layer thickness can not be too small, therefore the planar dimension of experimental rig and height are larger.
(2) the test stress is larger, therefore experimental rig should have biggish intensity, does not occur that it during the test by force
Degree destroys, and influences the progress of test.
(3) planar dimension of the test stress and test specimen is larger, therefore experimental rig should have biggish rigidity, make its
It is not deformed during test, influences the measurement of test data.
(4) stress and vertical height of test specimen are larger, therefore the range of the universal testing machine used and the vertical space that stretches are answered
It meets the requirements.
Therefore, as shown in Fig. 2, the examination of a kind of test major diameter of the utility model double limb reinforcing bars and Concrete Bond Strength
Experiment device, including upper plate 5, lower plate 6, upper plate is connect with lower plate by screw rod 7, between upper plate 5 and lower roof plate 6
Form the test specimen main body accommodation space that can be placed in concrete block；The upper plate 5 is equipped with top load bar 4, and the top adds
Bar 4 is carried for being clamped at the top of testing machine；Lower plate 6 opens up test specimen reinforced steel bar perforation, and concrete block merging test specimen main body is accommodated
Space after double limb reinforcing bars of test specimen lower end are passed through the test specimen reinforced steel bar perforation, and utilizes the lower fixture clamping test pieces of testing machine
Double limb reinforcing bars lower end.
The joint face of its middle and upper part load bar 4 and upper plate 5 is contact spherical surface 10, is suitable for the inclined of test machine clamping direction
Difference, and keep stress more uniform.Four connecting screws 7 are set between upper plate 5, lower plate 6, and 7 end of screw rod is twisted using bolt 8
Tightly, so that forming the test specimen main body accommodation space that can be placed in test specimen main body between upper plate 5 and lower roof plate 6.Lower plate 6 is in center
Flat round hole is opened, is passed through with adapting to the double limb reinforcing bars of major diameter, aperture should not be too big, avoids weakening lower plate too many.Upper plate with
Bottom plate spacing is answered as small as possible meeting on the basis of test specimen is oblique to be put into device, avoid exceeding the vertical of universal testing machine
Stretch space.The implosion guard shield 9 that makes a circle in week can prevent test specimen from bursting apart, guarantee test safety.
Used universal testing machine 11, load range are not less than 1500kN, and the vertical space that stretches should be not less than
900mm clamps fixture used in double limb reinforcing bars and uses steel plate fixture 12.The vertical space that stretches should be not less than 900mm, it is ensured that straight
Double limb reinforcing bars that diameter is 32mm enough test spaces in 9d meet the upper limit requirement of test.The lower fixture of universal testing machine
Double limb reinforcing bars are clamped, using steel plate fixture to guarantee uniform force, it is desirable that test specimen production answers the double limb reinforcing bars of strict guarantee flat
It is accurately positioned on face, reinforcing bar is vertical with template in vertical direction, and guarantees the longitudinal rib of reinforcing bar in non-clamping direction.
The test method of the utility model the following steps are included:
Firstly, production test test specimen 3.According to the bar diameter and anchorage length of experimental study, the ruler of test component 3 is determined
Very little, planar dimension should meet the requirement that cleavage fracture does not occur for test specimen during the test, and vertical dimension should meet reinforcing bar anchor
Gu the requirement of length.It is vertical with template in vertical direction to should ensure that reinforcing bar 2 in test specimen production, and guarantees that the longitudinal rib of reinforcing bar 2 exists
Non-clamping direction can make double limb reinforcing steel bar bears balanced, and test process does not slide；While it in the reinforcing bar of test specimen loading end and mixing
The PVC casing off reinforcing bar and concrete of solidifying soil junction setting 35mm long, to guarantee that the test of adhesion strength can exclude to load
Hold the influence of complicated applied force；
Secondly, production experimental rig.Upper plate 5 is connect with lower plate 6 using four screw rods 7 of diameter 45mm, screw rod 7
It is tightened using bolt 8 end.Having a size of 400mm × 280mm × 60mm, the setting of planar dimension guarantees for upper plate 5 and lower plate 6
Maximum place of test specimen requires, and the setting of thickness guarantees the strength and stiffness of device.Then, by top load bar 4 and upper plate 5
Connection, contact surface make uniform force for spherical surface 10 to meet the deviation in test machine clamping direction.The setting of 6 flat round hole of lower plate
Double limb reinforcing bars can be made to pass through.
Then, experimental rig is mounted on universal testing machine 11 (the vertical space that stretches is not less than 900mm).Top load
Bar 4 is clamped at the top of universal testing machine, by test specimen obliquely through the flat round hole of lower plate 6.The spacing of upper plate 5 and lower plate 6
For 450mm, meet test specimen obliquely through minimum constructive height.After the completion of to be installed, the double limb reinforcing bars 2 of the major diameter of test specimen 3 are clamped
In the steel plate fixture 12 of universal test motor spindle.
The implosion guard shield 9 finally, installation makes a circle in week, can be tested., test force when reinforcing bar is broken can reach
500 kN, test specimen may be popped up out of experimental rig, have certain risk, and implosion guard shield can play a protective role,
Test loading scheme takes first power to load the Combined Loading mode for being displaced load again.(1) power loads: loading speed 9kN/s, load
To 550 kN；(2) displacement load: loading speed 2.4mm/min is loaded into 120 mm, entire test period about 1200s.Early period
Precompressed and reinforcing bar stretch section, which load control mode using power, can accelerate test rate, and later period reinforcement yielding section is using power load control
Mode can effectively capture the descending branch of loading curve.
The concrete used when the utility model describes is not limited to the material for ultra-high performance concrete, any common
The complex cements such as concrete, modified concrete, fiber concrete, high performance concrete sill all should be in the utility model technology
In protection scope.
It is discussed in detail although the content of the utility model has passed through above preferred embodiment, but it should be appreciated that on
The description stated is not considered as limitations of the present invention.After those skilled in the art have read above content, for
A variety of modifications and substitutions of the utility model all will be apparent.Therefore, the protection scope of the utility model should be by appended
Claim limit.
Claims (7)
1. a kind of experimental rig of test major diameter double limb reinforcing bars and Concrete Bond Strength, test specimen include concrete block and stretch
Double limb reinforcing bars outside concrete block out, it is characterised in that the experimental rig includes upper plate, lower plate, upper plate and lower plate
It is connected by screw rod, forms the test specimen main body accommodation space that can be placed in concrete block between upper plate and lower roof plate；On described
Top plate is equipped with top load bar, and the top load bar is for being clamped at the top of testing machine；Lower plate opens up test specimen reinforcing bar and wears
Concrete block is placed in test specimen main body accommodation space by hole, after double limb reinforcing bars of test specimen lower end are passed through the test specimen reinforced steel bar perforation, and
Utilize double limb reinforcing bars lower end of the lower fixture clamping test pieces of testing machine.
2. the experimental rig of a kind of test major diameter double limb reinforcing bars and Concrete Bond Strength as described in claim 1, special
Sign is that the joint face of the top load bar and upper plate is spherical surface.
3. the experimental rig of a kind of test major diameter double limb reinforcing bars and Concrete Bond Strength as described in claim 1, special
Sign is that the test specimen reinforced steel bar perforation of the lower plate is the flat round hole for being provided with lower plate center, to adapt to the double limb steel of major diameter
Muscle passes through.
4. the experimental rig of a kind of test major diameter double limb reinforcing bars and Concrete Bond Strength as described in claim 1, special
Sign is, upper plate and bottom plate spacing are preferably 440 ~ 460mm, meet test specimen obliquely through minimum constructive height.
5. the experimental rig of a kind of test major diameter double limb reinforcing bars and Concrete Bond Strength as described in claim 1, special
Sign is, implosion guard shield is equipped with around the experimental rig.
6. the experimental rig of a kind of test major diameter double limb reinforcing bars and Concrete Bond Strength as described in claim 1, special
Sign is, the test specimen includes the cuboid concrete block of 350 mm of 250mm*250 mm *, in the cuboid concrete block
Double limb reinforcing bars of diameter 32mm are equipped with, double limb reinforcing bars lower part is loading end, and top is free end, and length is stretched out in middle and lower part
Degree be 240mm, top extension elongation be 30mm, the upper plate and lower plate of the experimental rig having a size of 400mm × 280mm ×
60mm, to guarantee the strength and stiffness of device.
7. the experimental rig of a kind of test major diameter double limb reinforcing bars and Concrete Bond Strength as described in claim 1, special
Sign is that the testing machine uses universal testing machine, and the vertical space that stretches is not less than 900mm, and the lower fixture of the testing machine is adopted
Double limb reinforcing bars are clamped with steel plate fixture.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820487470.9U CN208607136U (en) | 2018-04-08 | 2018-04-08 | Test the experimental rig of major diameter double limb reinforcing bars and Concrete Bond Strength |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820487470.9U CN208607136U (en) | 2018-04-08 | 2018-04-08 | Test the experimental rig of major diameter double limb reinforcing bars and Concrete Bond Strength |
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| CN208607136U true CN208607136U (en) | 2019-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060649A (en) * | 2018-04-08 | 2018-12-21 | 上海市政工程设计研究总院（集团）有限公司 | Test the experimental rig and method of major diameter double limb reinforcing bars and Concrete Bond Strength |
-
2018
- 2018-04-08 CN CN201820487470.9U patent/CN208607136U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060649A (en) * | 2018-04-08 | 2018-12-21 | 上海市政工程设计研究总院（集团）有限公司 | Test the experimental rig and method of major diameter double limb reinforcing bars and Concrete Bond Strength |
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