CN104155185A - Concrete performance testing device under combined action of constant tensile load and erosion medium - Google Patents
Concrete performance testing device under combined action of constant tensile load and erosion medium Download PDFInfo
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- CN104155185A CN104155185A CN201410438479.7A CN201410438479A CN104155185A CN 104155185 A CN104155185 A CN 104155185A CN 201410438479 A CN201410438479 A CN 201410438479A CN 104155185 A CN104155185 A CN 104155185A
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Abstract
The invention discloses a concrete performance testing device under the combined action of a constant tensile load and an erosion medium, relates to the field of concrete durability testing and solves the problem that an existing testing device cannot implement concrete performance testing under the combined action of a constant stress and medium erosion. The testing device comprises a bottom plate, a connecting base, a first puller, a middle pressure plate, an upper pressure plate, a pull rod, a dish-shaped spring and a medium circulating device, wherein the bottom plate is fixedly connected with an upright; the connecting base is fixed in the middle of the bottom plate; the first puller is hinged to the connecting base and can rotate around the connecting base; the middle pressure plate passes through the upright and is fixed at a limiting point of the upright; the upper pressure plate passes through the upright; the pull rod passes through through holes in the middle pressure plate and the upper pressure plate; one end of the pull rod is connected with a spherical joint; a second puller is connected to the spherical joint; a nut is screwed at the other end of the pull rod; the dish-shaped spring sleeves the pull rod and is positioned between the middle pressure plate and the upper pressure plate; one end of a concrete test piece is connected to the first puller and the other end of the concrete test piece is connected to the second puller.
Description
Technical field
The invention belongs to endurance performance of concrete field tests, particularly relate to a kind of testing concrete performance device under constant axial tension and corrosive medium acting in conjunction that continues, to study subversive gas or transmission performance and the mechanism of ion in concrete under the constant tension of varying level.
Background technology
Under the tension of prior art and etching medium acting in conjunction in concrete durability proving installation, this device utilizes the reacting force of Compress Spring to apply tension to the concrete being clipped between tensioning chuck, package unit is placed in to the environmental baseline that chemical corrosion case simulation medium corrodes, by Anti-leakage instrument, concrete sample is applied to different hydraulic pressure, but this device tensioning chuck can directly affect stressing conditions with the situation that contacts of concrete sample, the position that chuck contacts with test specimen simultaneously easily occurs that the concentrated test specimen head that causes of stress ruptures; Two universal spherical joints can make the installation of the too large unfavorable test specimen of test specimen freedom of movement.Meanwhile, when performance test in the time carrying out with etching medium acting in conjunction, package unit need to be put into corrosion environment, so inevitably can itself have certain corrosion to installing, and operation inconvenience, test result affected.The erosion medium resistance environment of immersion type, can not reflect test specimen one side Penetration Signature.
Actual in commission concrete is subject to the multiple action of the environmental factor such as load and extraneous corrosive medium conventionally, therefore, for Simulated Service concrete corrosive medium transmission performance in concrete under actual stress state, should design testing concrete performance device under a set of constant constant stretch load and etching medium acting in conjunction, this is of great significance for transmission performance and the mechanism tool of corrosive medium (ion, gas) in concrete under the constant axial tension of research varying level.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of testing concrete performance device under constant axial tension and corrosive medium acting in conjunction that continues, fundamental purpose is to solve existing proving installation in test process, to occur tension bias, stress relaxation, and can not realize the problem of testing concrete performance under stress and erosion medium resistance coupling.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme: continue testing concrete performance device under constant axial tension and corrosive medium acting in conjunction, it comprises:
Base plate, is fixedly connected with at least four root posts on described base plate;
Connection Block, is fixed on the middle part of described base plate;
The first pull head, is hinged on described Connection Block and can rotates around described Connection Block;
Middle pressing plate, passes described column, and is fixed on the limit point of column; Top board, through described column;
Pull bar, through the through hole of pressing plate in the middle of described and top board, one end of described pull bar connects spherical joint, and the second pull head is connected on spherical joint; The other end of described pull bar has screwed nut;
Disk spring, is set on described pull bar, between described middle pressing plate and top board;
One end of described concrete sample is connected to the first pull head, and the other end is connected to the second pull head;
Media recycler, contacts with concrete sample, and liquid corrosion environment is provided.
Testing concrete performance device under constant stretch load as above and etching medium acting in conjunction, also comprises media recycler, and it comprises:
Liquor box, comprises spaced inlet and liquid outlet; The one side of described liquor box has open slot;
Constant flow pump, the liquid outlet of constant flow pump is communicated with the inlet of liquor box by conduit;
Liquid reserve tank, the inlet of constant flow pump is communicated with liquid reserve tank by conduit; Liquid reserve tank is communicated with the liquid outlet of liquor box.
Compared with prior art, beneficial effect of the present invention is:
1, solve eccentricity issues in drawing process
Apply in tension process, as easy as rolling off a logly occur that the axis of tension sample does not overlap with tensile load effect, thereby occur stress eccentric phenomena.For ensureing that the tension applying is axle center tensile load, the present invention reduces or eliminates eccentric from following several respects: the first pull head is connected with plane articulation, ensures that the first pull head can be along the Plane Rotation at place, test specimen axle center; The second pull head is connected with spherical joint, can freely swing around the spherical part of spherical joint is universal.When test specimen is arranged on and tests between the first pull head and the second pull head, if eccentric phenomena appears in a certain pull head, the corresponding pull head of side can carry out deflection, eliminates until eccentric.
2, solve stress and apply Stress relaxation in process
In the time that test specimen is applied to long duration load, because the distortion of test specimen there will be the phenomenon of stress relaxation, especially, in the time of tension and environmental factor coupling, inside concrete may produce more serious damage, and test piece deformation is larger, causes stress relaxation more serious.The present invention adopts disk spring stress application, can be lax by the distortion release portion component of stress of disk spring self.
3, can adapt to the test specimen of different length.The present invention's the second pull head is connected with pull bar, and pull bar can move up and down, thereby can meet the length requirement of different test specimens.
4, the present invention adopts supporting medium circulation system to realize the testing concrete performance under stress and erosion medium resistance coupling.In the water tank of concrete sample side, can pass into aggressive liquids or gas, realize the coupling of environmental factor and tension; Constant flow pump can be adjusted the cycle rate of aggressive liquids or gas, thus the performance test of the concrete of realization in extended state under the erosion medium resistance of different cycle rates.
Testing concrete performance device under constant stretch load as above and etching medium acting in conjunction, further, described spherical joint comprises holder and spheroid, and spheroid is arranged on the spherical inner chamber of holder, and the second pull head is connected with spheroid through the perforate of holder.
Testing concrete performance device under constant stretch load as above and etching medium acting in conjunction, further, one end of test specimen has been evenly arranged bolt, is connected with the first pull head by bolt, the other end has been evenly arranged bolt, is connected with the second pull head by bolt.In preferred embodiment, the first pull head and the second pull head be equipped with four taking axle center the threaded hole as symcenter, for being connected with corresponding test specimen.
Existing proving installation is in the time applying tension, and test specimen is connected with pull bar by chuck, thus easy like this causing concentrate test specimen destroyed in clamping place at the stress of clamping place, and be not to break in centre.For the stress of eliminating chuck place is concentrated, test specimen of the present invention is connected with pull head by bolt uniform on test specimen, the stress of having avoided direct rigidity to clamp bringing is concentrated, and has avoided fixture to contact with the direct rigidity of test specimen simultaneously, can not affect applying of stress by test specimen surface smoothness.
Testing concrete performance device under constant stretch load as above and etching medium acting in conjunction, further, the other end of described pull bar is also arranged with thrust bearing, between nut and top board.
Testing concrete performance device under constant stretch load as above and etching medium acting in conjunction, further, pastes strainometer on described pull bar.Strainometer on pasting on pull bar, its lead-in wire is connected with computing machine, can the Real-Time Monitoring variation of stress value everywhere, if stress value departs from setting threshold, can make it to keep original value by adjusting nut.
Testing concrete performance device under constant stretch load as above and etching medium acting in conjunction, further, described column, base, base plate, top board, middle pressing plate, the first pull head, the second pull head, pull bar, sphere unit are non-expansion steel material.
Testing concrete performance device under lasting constant axial tension as above and corrosive medium acting in conjunction, further, described test specimen profile is dumbbell shape.
Brief description of the drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Testing concrete performance device schematic diagram under the lasting constant axial tension that Fig. 1 provides for the embodiment of the present invention and corrosive medium acting in conjunction;
A kind of media recycler schematic diagram that Fig. 2 provides for the embodiment of the present invention;
A kind of spherical joint schematic diagram that Fig. 3 provides for the embodiment of the present invention.
In accompanying drawing, the list of parts of each label representative is as follows:
1, base plate, 2, Connection Block, 21, the first pull head, 3, middle pressing plate, 4, top board, 5, pull bar, 51, nut, 52, disk spring, 53, thrust bearing, 6, spherical joint, 61, the second pull head, 7, concrete sample, 8, liquor box, 9, constant flow pump, 10, liquid reserve tank.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but not as a limitation of the invention.
There is tension bias, stress relaxation in the existing proving installation of problem to be solved by this invention, and can not realize testing concrete performance under stress and erosion medium resistance coupling in test process.As depicted in figs. 1 and 2, testing concrete performance device under a kind of lasting constant axial tension and corrosive medium acting in conjunction, it comprises:
Base plate 1, is fixedly connected with at least four root posts on described base plate; Preferably, in embodiment as shown in Figure 1, base plate is rectangle, and column quantity is four, is bolted to connection respectively four edges of base plate.
Connection Block 2, is fixed on the middle part of described base plate; The first pull head 21, is hinged on described Connection Block and can rotates around described Connection Block; Described Connection Block and the first pull head composition plane articulation play the effect of balance tension in test specimen test process.
Middle pressing plate 3, passes described column, and is fixed on the limit point of column; In concrete implementation process, middle pressing plate can be welded on the limit point place of column, can be also the limit point place that is fastened on column.Described limit point is the fixed position of middle pressing plate, determines the also upper end of more close column of the longer limit point of test specimen at the particular location of column according to the test specimen length of required test.Top board 4, through described column, can slide along described column;
Pull bar 5, through the through hole of pressing plate in the middle of described and top board, one end of described pull bar connects spherical joint 6, prevents that the stress applying from occurring eccentric in test specimen test process, guarantees that applied stress is always axial along test specimen.The second pull head 61 is connected on spherical joint; The other end of described pull bar has screwed nut 51; As shown in Figure 3, described spherical joint 6 comprises holder 62 and spheroid 64, and spherical inner chamber 63, the second pull heads that spheroid is arranged on holder 62 are connected with spheroid 64 through the perforate 65 of holder.
Disk spring 52, is set on described pull bar 5, between described middle pressing plate 3 and top board 4;
One end of described concrete sample 7 is connected to the first pull head 21, and the other end is connected to the second pull head 61.In one embodiment, described pull head has tong, by tong, test specimen is connected with proving installation;
Media recycler, it comprises: liquor box 8, comprises spaced inlet and liquid outlet; The one side of described liquor box has open slot; Constant flow pump 9, the liquid outlet of constant flow pump is communicated with the inlet of liquor box by conduit; Liquid reserve tank 10, the inlet of constant flow pump is communicated with liquid reserve tank by conduit; Liquid reserve tank is communicated with the liquid outlet of liquor box.
Under the lasting constant axial tension of above-described embodiment and corrosive medium acting in conjunction, the use procedure of testing concrete performance device is as follows: first packing washer is placed into liquor box installation site, the open slot of liquor box is pressed on packing washer and realizes and sealing, then utilize U-shaped pipe that liquor box is fixedly connected with test specimen, then test specimen is installed.(also can use iron wire to be wound around just liquor box is fixedly connected with test specimen.In the time that liquor box is organic glass material, also can use the bonding agents such as epoxy resin directly liquor box and concrete sample to be adhesively fixed, do not need to add like this sealing filler ring.) test specimen installation process is as follows, and one end of test specimen is connected to the first pull head, the other end of test specimen is connected to another pull head.Then screw the nut of the pull bar other end, the test specimen that furthers gradually, in the test specimen that furthers, disk spring gradually reduces, storage elasticity potential energy; In the time that the tension applying reaches the predetermined value of test, stop screwing nut and test.
Said apparatus has solved: 1, eccentricity issues in drawing process.When test specimen is arranged on and tests between the first pull head and the second pull head, if eccentric phenomena appears in a certain pull head, the corresponding pull head of side can carry out deflection, eliminates until eccentric.2, stress applies Stress relaxation in process.In the time of stress relaxation, owing to having stored elastic potential energy in disk spring, can be lax by the distortion release portion component of stress of disk spring self, improve the tension accuracy of test.In addition, because the second pull head is connected with pull bar, pull bar can move up and down, thereby can meet the length requirement of different test specimens.Adopt supporting medium circulation system to realize the testing concrete performance under stress and erosion medium resistance coupling.In the liquor box of concrete sample side, can pass into aggressive liquids or gas, realize the coupling of environmental factor and tension; Constant flow pump can be adjusted the cycle rate of aggressive liquids or gas, thus the performance test of the concrete of realization in extended state under the erosion medium resistance of different cycle rates.
Proving installation in above-described embodiment is in the time applying tension, and test specimen is connected with pull bar by chuck, thus easy like this causing concentrate test specimen destroyed in clamping place at the stress of clamping place, and be not to break in centre.
Testing concrete performance device under lasting constant axial tension as above and corrosive medium acting in conjunction is further improved, one end of test specimen has been evenly arranged bolt, be connected with the first pull head by bolt, the other end has been evenly arranged bolt, is connected with the second pull head by bolt.In preferred embodiment, the first pull head and the second pull head be equipped with four taking axle center the threaded hole as symcenter, for being connected with corresponding test specimen.Be connected with pull head by bolt uniform on test specimen, the stress of having avoided direct rigidity to clamp bringing is concentrated, and has avoided fixture to contact with the direct rigidity of test specimen simultaneously, can not affect applying of stress by test specimen surface smoothness.
Continue in the embodiment of testing concrete performance device under constant axial tension and corrosive medium acting in conjunction at another kind, the other end of described pull bar is also arranged with thrust bearing 53, between nut and top board.Resistance when thrust bearing can reduce nutting, facilitates applying of stress.
Continue, in the embodiment of testing concrete performance device under constant axial tension and corrosive medium acting in conjunction, on described pull bar, to paste strainometer at another kind, concrete, strainometer is pasted to the position of pull bar near spherical joint.Strainometer on pasting on pull bar, its lead-in wire is connected with computing machine, can the Real-Time Monitoring variation of stress value everywhere, if stress value departs from setting threshold, can make it to keep original value by adjusting nut.
Continue in the embodiment of testing concrete performance device under constant axial tension and corrosive medium acting in conjunction at another kind, described column, base, base plate, top board, middle pressing plate, the first pull head, the second pull head, pull bar, sphere unit are non-expansion steel material, indeformable in-80 DEG C～100 DEG C.Non-expansion steel is in the time receiving External Force Acting, and deformation is little, can further prevent from carrying out test specimen when test and producing eccentric force applying tension.
Above embodiment is only exemplary embodiment of the present invention, is not used in restriction the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can, in essence of the present invention and protection domain, make various amendments or be equal to replacement the present invention, this amendment or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (8)
1. a testing concrete performance device under constant stretch load and etching medium acting in conjunction, is characterized in that, comprising:
Base plate, is fixedly connected with at least four root posts on described base plate;
Connection Block, is fixed on the middle part of described base plate;
The first pull head, is hinged on described Connection Block and can rotates around described Connection Block;
Middle pressing plate, passes described column, and is fixed on the limit point of column; Top board, through described column;
Pull bar, through the through hole of pressing plate in the middle of described and top board, one end of described pull bar connects spherical joint, and the second pull head is connected on spherical joint; The other end of described pull bar has screwed nut;
Disk spring, is set on described pull bar, between described middle pressing plate and top board;
One end of described concrete sample is connected to the first pull head, and the other end is connected to the second pull head;
Media recycler, contacts with concrete sample, and liquid corrosion environment is provided.
2. testing concrete performance device under constant stretch load according to claim 1 and etching medium acting in conjunction, is characterized in that, also comprise media recycler, it comprises:
Liquor box, comprises spaced inlet and liquid outlet; The one side of described liquor box has open slot;
Constant flow pump, the liquid outlet of constant flow pump is communicated with the inlet of liquor box by conduit;
Liquid reserve tank, the inlet of constant flow pump is communicated with liquid reserve tank by conduit; Liquid reserve tank is communicated with the liquid outlet of liquor box.
3. testing concrete performance device under constant stretch load according to claim 1 and 2 and etching medium acting in conjunction, it is characterized in that, described spherical joint comprises holder and spheroid, and spheroid is arranged on the spherical inner chamber of holder, and the second pull head is connected with spheroid through the perforate of holder.
4. testing concrete performance device under constant stretch load according to claim 1 and 2 and etching medium acting in conjunction, it is characterized in that, one end of test specimen has been evenly arranged bolt, is connected with the first pull head by bolt, the other end has been evenly arranged bolt, is connected with the second pull head by bolt.
5. testing concrete performance device under constant stretch load according to claim 1 and 2 and etching medium acting in conjunction, is characterized in that, the other end of described pull bar is also arranged with thrust bearing, between nut and top board.
6. testing concrete performance device under constant stretch load according to claim 1 and 2 and etching medium acting in conjunction, is characterized in that, on described pull bar, pastes strainometer.
7. testing concrete performance device under constant stretch load according to claim 1 and 2 and etching medium acting in conjunction, it is characterized in that, described column, base, base plate, top board, middle pressing plate, the first pull head, the second pull head, pull bar, sphere unit are non-expansion steel material.
8. testing concrete performance device under constant stretch load according to claim 1 and 2 and etching medium acting in conjunction, is characterized in that, described test specimen profile is dumbbell shape.
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| CN104931369A (en) * | 2015-07-08 | 2015-09-23 | 华东交通大学 | Subway steel bar erosion and tension fatigue coupling test device |
| CN105424478A (en) * | 2015-12-01 | 2016-03-23 | 浙江工业大学 | Test device for axial tension load applied by concrete member |
| CN105628599A (en) * | 2016-02-29 | 2016-06-01 | 沈阳建筑大学 | Device and method for studying performance of steel pipe concrete axial-tension member under loads and corrosion |
| CN106248566A (en) * | 2016-08-31 | 2016-12-21 | 西安摩尔石油工程实验室股份有限公司 | Frame-type constant load stress corrosion testing device |
| CN107966462A (en) * | 2017-11-20 | 2018-04-27 | 北京强度环境研究所 | A kind of aircraft small sample X-ray tomography in-situ testing device |
| CN108732049A (en) * | 2018-03-26 | 2018-11-02 | 东莞市恒宇仪器有限公司 | A kind of tensile fatigue test machine |
| CN109163965A (en) * | 2018-09-26 | 2019-01-08 | 姜军 | A kind of chain strength detection device of chain-bucket dredge boat |
| CN111707541A (en) * | 2020-06-24 | 2020-09-25 | 扬州大学 | Concrete uniaxial tension holding load and testing device and using method thereof |
| CN112444481A (en) * | 2020-10-23 | 2021-03-05 | 同济大学 | Holding force device for pitting corrosion emergence test and test method thereof |
| CN113092242A (en) * | 2021-04-30 | 2021-07-09 | 中国石油天然气集团有限公司 | Non-uniform loading stress corrosion test device and test method thereof |
| CN115060578A (en) * | 2022-06-02 | 2022-09-16 | 陕西杨鑫煤矿机械制造有限责任公司 | Tensile testing device of mine chain |
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| CN104614235A (en) * | 2015-01-29 | 2015-05-13 | 南京理工大学 | Tension and compression integrated clamp for mechanical creep testing machine |
| CN104931369A (en) * | 2015-07-08 | 2015-09-23 | 华东交通大学 | Subway steel bar erosion and tension fatigue coupling test device |
| CN105424478B (en) * | 2015-12-01 | 2018-05-08 | 浙江工业大学 | Concrete component applies the experimental rig of axial tension load |
| CN105424478A (en) * | 2015-12-01 | 2016-03-23 | 浙江工业大学 | Test device for axial tension load applied by concrete member |
| CN105628599A (en) * | 2016-02-29 | 2016-06-01 | 沈阳建筑大学 | Device and method for studying performance of steel pipe concrete axial-tension member under loads and corrosion |
| CN106248566A (en) * | 2016-08-31 | 2016-12-21 | 西安摩尔石油工程实验室股份有限公司 | Frame-type constant load stress corrosion testing device |
| CN107966462A (en) * | 2017-11-20 | 2018-04-27 | 北京强度环境研究所 | A kind of aircraft small sample X-ray tomography in-situ testing device |
| CN108732049A (en) * | 2018-03-26 | 2018-11-02 | 东莞市恒宇仪器有限公司 | A kind of tensile fatigue test machine |
| CN109163965A (en) * | 2018-09-26 | 2019-01-08 | 姜军 | A kind of chain strength detection device of chain-bucket dredge boat |
| CN109163965B (en) * | 2018-09-26 | 2020-12-15 | 江苏丰源船舶工程有限公司 | Chain strength detection device of chain bucket type sand dredger |
| CN111707541A (en) * | 2020-06-24 | 2020-09-25 | 扬州大学 | Concrete uniaxial tension holding load and testing device and using method thereof |
| CN112444481A (en) * | 2020-10-23 | 2021-03-05 | 同济大学 | Holding force device for pitting corrosion emergence test and test method thereof |
| CN113092242A (en) * | 2021-04-30 | 2021-07-09 | 中国石油天然气集团有限公司 | Non-uniform loading stress corrosion test device and test method thereof |
| CN115060578A (en) * | 2022-06-02 | 2022-09-16 | 陕西杨鑫煤矿机械制造有限责任公司 | Tensile testing device of mine chain |
| CN115060578B (en) * | 2022-06-02 | 2023-11-21 | 陕西杨鑫煤矿机械制造有限责任公司 | Tension testing device for mine chain |
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