CN208043559U - A kind of device of test compression and cyclic bending concrete durability - Google Patents
A kind of device of test compression and cyclic bending concrete durability Download PDFInfo
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- CN208043559U CN208043559U CN201820175249.XU CN201820175249U CN208043559U CN 208043559 U CN208043559 U CN 208043559U CN 201820175249 U CN201820175249 U CN 201820175249U CN 208043559 U CN208043559 U CN 208043559U
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- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000005452 bending Methods 0.000 title claims abstract description 50
- 230000006835 compression Effects 0.000 title claims abstract description 50
- 238000007906 compression Methods 0.000 title claims abstract description 50
- 125000004122 cyclic group Chemical group 0.000 title claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 150000003839 salts Chemical class 0.000 claims abstract description 26
- 238000010257 thawing Methods 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 239000002689 soil Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000003628 erosive effect Effects 0.000 claims description 9
- 239000012267 brine Substances 0.000 claims description 8
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 8
- 230000008014 freezing Effects 0.000 claims description 7
- 238000007710 freezing Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000012669 compression test Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Abstract
The utility model discloses the devices of a kind of test compression and cyclic bending concrete durability, including：Testing stand；The reaction frame being fixed on testing stand, reaction frame sidewall symmetry are equipped with two pieces of fixed blocks, the load bar moved up and down along reaction frame are equipped with below fixed block；Compressibility, it is divided into compression piece and lower compression piece, upper compression piece upper end is fixed at the top of reaction frame, and lower compression piece lower end is fixed with lateral load bar, upper compression piece lower end is equipped with fixing steel clamp with lower compression piece upper end, and jack is arranged between testing stand and lateral load bar；The cyclic bending system being fixed on reaction frame side wall；The condition test circulatory system, for providing concrete sample experimental enviroment；Data acquisition controller.Tested using the device of the utility model, there is the features such as true and accurate, simple operable, cheap, to greatest extent close to electric power pylon concrete pipe base salt lose or freezing-thawing under bear the operating mode of compression and reciprocal wind action simultaneously.
Description
Technical field
The utility model is related to concrete strengths and durability test field, more particularly, to a kind of test compression and back and forth
It is bent the device of concrete durability.
Background technology
There is the soil of the length and breadth of land and abundant wind resource, transmission line of electricity to pass through gobi, oasis, the energy is transported in Xinjiang
Local huge numbers of families are also transported to interior ground big city small town.The conveying of electric power energy be unable to do without electric power pylon, supports electric power pylon
The long-term security of concrete-pile is directly related to the safety of electric power pylon and entire transmission line of electricity.Support the concrete-pile of steel tower
The reciprocating (cyclic bending) of wind is born, while concrete-pile bears to be compressed axially effect under the huge dead weight of steel tower, i.e.,
The concrete-pile of steel tower is supported to bear to be compressed axially simultaneously and the coupling of cyclic bending.Moreover, Xinjiang earth's surface salination is tight
Weight, annual salt erosion cause a large amount of infrastructure to be damaged.
In addition to this, Xinjiang belongs to seasonal frost region, and winter surface temperature is below the freezing point, and the water in concrete voids becomes ice crystal
Volume expansion, while the ice crystal into concrete of the non-freeze water outside concrete migrates, and leads to the ice crystal in concrete hollow gap
Volume increased dramatically, and ice crystal volume increased dramatically generates huge splitting power in inside concrete, show that macroscopic view is improved quality damage
It loses, integrality declines, and strength reduction, summer temp warms, and ice crystal disappears, in cycles, research shows that moisture supplement is frost heave
The main reason for, every year since freeze thawing causes a large amount of infrastructure to be damaged.
It is many to can be used for testing coagulation earth salt erosion durability instrument and equipment both at home and abroad at present, the equipment for testing concrete strength
Also it has been reported that.But for the loading characteristic of Xinjiang special region condition and column foot, that is, tests under salt erosion or freezing-thawing and bear
It is compressed axially and but rarely has people's research with the experimental rig of cyclic bending coupling concrete durability and method.
Utility model content
The utility model provides a kind of device of test compression and cyclic bending concrete durability, have true and accurate,
It is simple operable, it is cheap the features such as, approach electric power pylon concrete pipe base to greatest extent under salt erosion or freezing-thawing
Compression and the operating mode of reciprocal wind action are born simultaneously, to bear larger wind load and salinized soil or frozen soil blazon the defeated of area
The research of ferroelectric tower concrete pipe base provides technical support and theoretical direction.
A kind of device of test compression and cyclic bending concrete durability, including：
Testing stand；
Reaction frame is fixed on testing stand；The reaction frame is equipped with the transverse direction moved up and down along reaction frame both sides side wall and adds
Carry bar；
Compressibility is divided into compression piece and lower compression piece, and the upper compression piece upper end is fixed at the top of reaction frame, described
Lower compression piece lower end is fixed with lateral load bar, and the upper compression piece lower end is equipped with fixing steel clamp with lower compression piece upper end, institute
It states and jack is set between testing stand and lateral load bar；
Cyclic bending system is fixed on reaction frame side wall, for providing cyclic bending load to concrete sample；
The condition test circulatory system, the experimental enviroment for providing concrete sample；
Data acquisition controller is electrically connected with compressibility and cyclic bending system.
The utility model is by compressibility, the effect of cyclic bending systematic collaboration so that it can act on concrete simultaneously
On test specimen with reach simulation concrete and meanwhile bear compression, cyclic bending operating mode.
Preferably, the upper compression piece upper end is by fixed at the top of flexural pivot and reaction frame, the lower compression piece lower end is logical
Flexural pivot is crossed to fix with load bar.
Preferably, the fixing steel clamp inner surface is equipped with rubber pad.Fixing steel clamp makes the active force being compressed axially more
It is uniform to act on concrete surface, and play cushioning effect by the way that rubber pad is arranged, and to concrete sample compression.Both it can protect
Effective transmission of card power can prevent concrete sample caused by Stress non-homogeneity from destroying again.
Preferably, being equipped with first pressure sensor between the jack and lateral load bar, the first pressure passes
Sensor is electrically connected with data acquisition controller.
By adjusting jack, so that lateral load bar moving up and down is moved up, concrete sample is generated axial
The action intensity that is compressed axially of compression, concrete sample is measured by first pressure sensor.
In utility model device, the cyclic bending system includes：Electric cylinder；It is fixed on electric cylinder bottom and reaction frame
Second pressure sensor between side wall；It is connect with the telescopic rod at the top of electric cylinder, the test specimen for fixing concrete test specimen is solid
Determine ring；The electric cylinder, second pressure sensor are electrically connected with data acquisition controller.
The utility model provides power, electric cylinder using the linear reciprocating motion of electric cylinder for concrete sample cyclic bending
Test specimen fixed ring is acted on, effective transmission of power has not only been can guarantee but also can prevent electric cylinder from directly acting on concrete sample and caused to answer
Concrete sample caused by power is concentrated destroys.
Preferably, being equipped with load adjusting gasket between the telescopic rod at the top of the electric cylinder and test specimen fixed ring.
Since the displacement of electric cylinder is fixed, the bending of concrete is made to adjust electric cylinder by load adjusting gasket
With gasket is more, and load is bigger.Size is acted on to calculate by the second pressure sensor values between electric cylinder and reaction frame
It obtains.
In utility model device, the condition test circulatory system can be that salt loses system, and the salt loses system packet
It includes：
Rubber sleeve is wrapped on the outside of concrete sample, the gap between being used in combination sandy soil to fill；
Sealing rubber ring is located at concrete sample end and seals concrete sample and rubber sleeve；
Markov bottle is equipped with brine, is connected with rubber sleeve, and it is not high in invading for concrete sample to adjust brine by air inlet pipe
Degree.
Concrete sample upper and lower ends prevent brine from leaking out using seal with elastometic washer, and Markov bottle fills for use brine and rubber
Set is connected, and providing constant salt to concrete sample loses water level, and concrete sample salt loses the capillary that water level above section utilizes sandy soil
Effect carries out salt erosion, and true environment is simulated to greatest extent with this.
Preferably, the condition test circulatory system can also be freezing and thawing system, the freezing and thawing system includes：
Rubber sleeve is wrapped on the outside of concrete sample, the gap between being used in combination sandy soil to fill；
Sealing rubber ring is located at concrete sample end and seals concrete sample and rubber sleeve；
Markov bottle is equipped with pure water, is connected with rubber sleeve, and it is not high in invading for concrete sample to adjust pure water by air inlet pipe
Degree；
Freezing-thawing chamber wraps up the testing stand, reaction frame, compressibility and cyclic bending system to provide freeze thawing
Environment.
A kind of device losing durability using test compression described in any of the above-described technical solution and cyclic bending coagulation earth salt
The method tested, includes the following steps：
Step 1, compressibility, cyclic bending system and the condition test circulatory system cooperate, and concrete sample is consolidated
It is scheduled in reaction frame；
Step 2, jack in compressibility is adjusted, pushes lateral load bar to move up and forces its longitudinal extruded concrete
Test specimen stops load when data acquisition controller collects when pulling force reaches setting numerical value, and at this moment concrete axial tension stress is：
Wherein, σ1For concrete sample axial tension stress, F1Pulling force is collected for data acquisition controller, A tries for concrete
Part area of section；
Step 3, the linear motion reciprocating frequence that cyclic bending system is controlled by data acquisition controller tries concrete
Part applies cyclic bending load, and by data acquisition controller record load F2, then cyclic bending system concrete sample is applied
The moment added is：
Wherein, M is the cyclic bending Maximum bending moment that concrete sample is born, F2For the pressure of data acquisition controller acquisition
Force value, L are concrete sample length；
Step 4, concrete sample is completed in experiment to take out, is placed on omnipotent concrete compression test and obtains concrete examination
Part axial compressive strength standard value, then calculates cubic compressive strength standard value, and calculation formula is：
Wherein, fcu,kFor cubic compressive strength standard value, fckFor axial compressive strength standard value, αc1For prism intensity
With the ratio of cube strength, αc2For Brittleness of Concrete coefficient.
The utility model loses the synergistic effect of system so that it can simultaneously by compressibility, cyclic bending system and salt
It acts on concrete sample, electric power pylon concrete pipe base bears to compress simultaneously in approaching to reality environment to greatest extent, past
The operating mode of the effects that multiple wind load, salt loses；The apparatus structure is simple, is conveniently operated, by adjusting jack and load spacer
Piece, can the large range of size for adjusting compressing force and cyclic bending active force, acquisition mass data for researching and analysing,
Research to bear the electric power pylon concrete pipe base that larger wind load and salinized soil blazon area provides technical support and theory
Guidance.
Description of the drawings
Fig. 1 is the structural schematic diagram that utility model device loses system with salt；
Fig. 2 is the structural schematic diagram of the utility model compressibility；
Fig. 3 is the structural schematic diagram of the utility model cyclic bending system；
Fig. 4 is the structural schematic diagram that the utility model salt loses system；
Fig. 5 is structural schematic diagram of the utility model device with freezing and thawing system.
Specific implementation mode
The utility model is further described with reference to the accompanying drawings and detailed description：
As shown in Figure 1, the device of a kind of test compression and cyclic bending concrete durability, including testing stand 1, reaction frame
2, compressibility, cyclic bending system 3, the condition test circulatory system and data acquisition controller 5.In the present embodiment, condition examination
It tests the circulatory system and system 4 is lost using salt.Reaction frame 2 is mounted on testing stand 1, and 2 side wall of reaction frame is equipped with one piece of fixed block 6, Gu
Determining that the lower section of block 6 is equipped with can be along the lateral load bar 7 that 2 side wall of reaction frame moves up and down.Compressibility includes upper compression piece, pushing
Contracting part, jack 8 and first pressure sensor 9.Upper compression piece upper end is fixed by flexural pivot 10 and 2 top of reaction frame, pushes
9 lower end of contracting part is fixed by flexural pivot 10 and lateral load bar 7, and 8 bottom of jack is mounted on testing stand 1, top installation first
It offsets with lateral load bar 7 after pressure sensor 9.First pressure sensor 9 is electrically connected with data acquisition controller 5.
As shown in Fig. 2, in compressibility, upper compression piece is symmetrical arranged with lower compression piece, upper compression piece lower part and lower compression
Part top is respectively and fixedly provided with fixing steel clamp 11, and 11 inner surface of fixing steel clamp is equipped with rubber pad 12, when being compressed to concrete sample from
To cushioning effect.
As shown in figure 3, cyclic bending system includes electric cylinder 31, test specimen fixed ring 32 and second pressure sensor 33,
Be fixed on 2 side wall of reaction frame after 31 bottom of electric cylinder installation second pressure sensor 33, the telescopic rod at 31 top of electric cylinder with
Load adjusting gasket 34 is equipped between test specimen fixed ring 32.Electric cylinder 31, second pressure sensor 33 all with data acquisition control
Device 5 is electrically connected.
Power is provided for concrete sample cyclic bending using the linear reciprocating motion of electric cylinder 31, electric cylinder 31 acts on
The test specimen fixed ring 32 being fixed in the middle part of test specimen not only can guarantee that the effective of power transmitted but also can to prevent electric cylinder 31 from directly acting on mixed
Solidifying soil test specimen causes stress concentration to cause concrete destruction, since the displacement of electric cylinder 31 is fixed, passes through load spacer
Piece 34 acts on the opposite of concrete sample to adjust electric cylinder 31, and gasket is more, and load is bigger.The size of load is by being located at
Second pressure sensor 33 between electric cylinder 31 and reaction frame 2 measures.
As shown in figure 4, salt erosion system 4 includes sandy soil 42, rubber sleeve 43 and Markov bottle 44；Concrete sample is placed in rubber sleeve
Symmetrically filling gap, upper and lower ends are sealed using the rubber pad 12 of sealing in 43 and with sandy soil 42, and Markov bottle 44 fills for use salt
Water is connected with rubber sleeve 43.Brine is adjusted by the air inlet pipe 45 in Markov bottle 44 and invades no height in concrete sample, to mixed
Solidifying soil test specimen provides constant salt and loses water level, and concrete sample salt loses water level above section and carries out salt using the capillarity of sandy soil 42
Erosion, simulates true environment to greatest extent.
As shown in figure 5, the condition test circulatory system in the experimental rig can also use freezing and thawing system, lost with using salt
The device of system is compared, and what Markov bottle 44 filled is pure water, and whole for wrapping up equipped with freezing-thawing chamber 13 outside device
A experimental rig is to provide freezing-thawing.44 Markov bottle 44 of Markov bottle is filled for use pure water with rubber sleeve 43 to be connected.Pass through horse
Air inlet pipe 45 on family name's bottle 44 adjusts pure water and invades no height in concrete sample, provides constant water level to concrete sample, mixes
Solidifying soil test specimen water level above section is supplemented using the capillarity of sandy soil 42, and operation freezing-thawing chamber 13 reduces experiment
The temperature of environment simulates true freezing-thawing to greatest extent.
Using the device for losing system with salt, the method for test compression and cyclic bending concrete durability, including following step
Suddenly：
(1) concrete sample to be measured is put into rubber sleeve 43, and is tamped therebetween with 2cm thickness sandy soil compression；
(2) first pressure sensor 9 and jack 8 are placed between moveable lateral load bar 7 and testing stand 1；
(3) concrete sample of periphery package rubber sleeve 43 is fixed with test specimen fixed ring 32, fixed position is concrete
The intermediate position of test specimen；
(4) sealing rubber pad 12 is placed on concrete both ends and is fixed with fixing steel clamp 11；
(5) adjusting jack 8 pushes up moveable lateral load bar 7 and moves up fixing concrete test specimen；
(6) load adjusting gasket 34 is added in test specimen fixed ring 32 according to the needs of cyclic bending load and is installed
Electric cylinder 31 and second pressure sensor 33；
(7) it will seal and connect with rubber sleeve 43 after perfusion brine in Markov bottle 44, adjusting air inlet pipe 45, which makes to invade, does not have coagulation
Invading for native test specimen does not reach specified altitude assignment highly, invades and does not have above section to carry out moisture supplement by 42 capillarity of sandy soil, completes
Salt erosion is acted on more approaching to reality environment.
(8) jack 8 in compressibility is adjusted, pushes lateral load bar 7 to move up and forces its longitudinal extruded concrete
Test specimen stops load when first pressure sensor 9 reaches setting numerical value, and at this moment concrete axial tension stress is：
Wherein, σ1For concrete sample axial tension stress, F1Show that pressure value, A are tried for concrete for first pressure sensor
Part area of section；
(9) the linear motion reciprocating frequence that electric cylinder is controlled by data acquisition controller applies back and forth concrete sample
Bending load, and load F is recorded by second pressure sensor 332, then the moment that electric cylinder applies concrete sample is：
Wherein, M is the cyclic bending Maximum bending moment that concrete sample is born, F2The pressure shown for second pressure sensor
Force value, L are concrete sample length；
(10) concrete sample is completed in experiment to take out, is placed on omnipotent concrete compression test and obtains concrete sample
Axial compressive strength standard value, and suggest that relational expression obtains cubic compressive strength standard value used in engineering practice by specification,
The cubic compressive strength standard value calculation formula is：
Wherein, fcu,kFor cubic compressive strength standard value, fckFor axial compressive strength standard value, αc1For prism intensity
With the ratio (Code for design of concrete structures GB 50010-2010) of cube strength, αc2For Brittleness of Concrete coefficient (concrete
Code for structural design GB 50010-2010).
Claims (8)
1. the device of a kind of test compression and cyclic bending concrete durability, which is characterized in that including：
Testing stand；
Reaction frame is fixed on testing stand；The reaction frame is equipped with the lateral load bar moved up and down along reaction frame both sides side wall；
Compressibility is divided into compression piece and lower compression piece, the upper compression piece upper end and fixed at the top of reaction frame, the pushing
Contracting part lower end is fixed with lateral load bar, and the upper compression piece lower end is equipped with fixing steel clamp, the examination with lower compression piece upper end
It tests between platform and lateral load bar and jack is set；
Cyclic bending system is fixed on reaction frame side wall, for providing cyclic bending load to concrete sample；
The condition test circulatory system, the experimental enviroment for providing concrete sample；
Data acquisition controller is electrically connected with compressibility and cyclic bending system.
2. the device of test compression according to claim 1 and cyclic bending concrete durability, which is characterized in that described
By fixed at the top of flexural pivot and reaction frame, the lower compression piece lower end is solid by flexural pivot and lateral load bar for upper compression piece upper end
It is fixed.
3. the device of test compression according to claim 1 and cyclic bending concrete durability, which is characterized in that described
Fixing steel clamp inner surface is equipped with rubber pad.
4. the device of test compression according to claim 1 and cyclic bending concrete durability, which is characterized in that described
First pressure sensor, the first pressure sensor and data acquisition controller electricity are equipped between jack and lateral load bar
Connection.
5. the device of test compression according to claim 1 and cyclic bending concrete durability, which is characterized in that described
Cyclic bending system includes：Electric cylinder；The second pressure sensor being fixed between electric cylinder bottom and reaction frame side wall；With electricity
Telescopic rod connection at the top of dynamic cylinder, is used for the test specimen fixed ring of fixing concrete test specimen；The electric cylinder, second pressure sensor
It is electrically connected with data acquisition controller.
6. the device of test compression according to claim 5 and cyclic bending concrete durability, which is characterized in that described
Load adjusting gasket is equipped between telescopic rod at the top of electric cylinder and test specimen fixed ring.
7. the device of test compression according to claim 1 and cyclic bending concrete durability, which is characterized in that described
The condition test circulatory system is that salt loses system, and salt erosion system includes：
Rubber sleeve is wrapped on the outside of concrete sample, the gap between being used in combination sandy soil to fill；
Sealing rubber ring is located at concrete sample end and seals concrete sample and rubber sleeve；
Markov bottle is equipped with brine, is connected with rubber sleeve, and adjust brine by air inlet pipe invades no height in concrete sample.
8. the device of test compression according to claim 1 and cyclic bending concrete durability, which is characterized in that described
The condition test circulatory system is freezing and thawing system, and the freezing and thawing system includes：
Rubber sleeve is wrapped on the outside of concrete sample, the gap between being used in combination sandy soil to fill；
Sealing rubber ring is located at concrete sample end and seals concrete sample and rubber sleeve；
Markov bottle is equipped with pure water, is connected with rubber sleeve, and adjust pure water by air inlet pipe invades no height in concrete sample；
Freezing-thawing chamber wraps up the testing stand, reaction frame, compressibility and cyclic bending system to provide freeze thawing ring
Border.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820175249.XU CN208043559U (en) | 2018-02-01 | 2018-02-01 | A kind of device of test compression and cyclic bending concrete durability |
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| CN201820175249.XU CN208043559U (en) | 2018-02-01 | 2018-02-01 | A kind of device of test compression and cyclic bending concrete durability |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181181A (en) * | 2018-02-01 | 2018-06-19 | 塔里木大学 | A kind of test compression and the device and method of cyclic bending concrete durability |
| CN111272537A (en) * | 2020-03-09 | 2020-06-12 | 广东工业大学 | Load holding device for concrete corrosion test in acid environment |
-
2018
- 2018-02-01 CN CN201820175249.XU patent/CN208043559U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181181A (en) * | 2018-02-01 | 2018-06-19 | 塔里木大学 | A kind of test compression and the device and method of cyclic bending concrete durability |
| CN111272537A (en) * | 2020-03-09 | 2020-06-12 | 广东工业大学 | Load holding device for concrete corrosion test in acid environment |
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