CN201266163Y - Test device for tension stress lower concrete water permeability - Google Patents
Test device for tension stress lower concrete water permeability Download PDFInfo
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- CN201266163Y CN201266163Y CNU2008201607469U CN200820160746U CN201266163Y CN 201266163 Y CN201266163 Y CN 201266163Y CN U2008201607469 U CNU2008201607469 U CN U2008201607469U CN 200820160746 U CN200820160746 U CN 200820160746U CN 201266163 Y CN201266163 Y CN 201266163Y
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- armor plate
- hole
- concrete
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- steel plate
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Abstract
The utility model discloses a water penetrability testing device for concrete under pulling stress. The testing device consists of an upper armor plate and a lower armor plate; four corners of each of the upper and lower armor plates are respectively provided with a hole; the center of each armor plate is provided with four small hoes in a decussation shape, and the distance between each small hole and the center is equal; the center of the upper armor plate is provided with a central hole in which a step is arranged; the diameter of a lower hole is equal to that of a blind hole prepared on a sample, and the diameter of an upper hole is matched with that of a dismountable copper tube; the upper armor plate and the lower armor plate are connected by four steel columns; one end of each steel column is provided with screw threads matching with a corresponding screw cap; the upper armor plate and the lower armor plate can parallelly move along the steel columns; a spring is sleeved on each steel column between the upper armor plate and the lower armor plate; and the central hole of the upper armor plate is connected with the dismountable copper tube. The utility model can simultaneously exert pulling force and adjust water pressure for concrete so as to achieve the measurement of water penetrability for concrete under continuous pulling stress.
Description
Technical field
The utility model relates to and tested by the concrete water permeability, and particularly a kind of concrete that can make is in lasting tension state, and the experiment pick-up unit of the water pressure of different pressures level can be provided again.
Background technology
Nearly all xoncrete structure is bearing load all, and load is to cause the inside concrete microfracture constantly to expand to cause the material macroscopic fracture to occur, cause the key factor of destroying concrete structure, so the permanance of research concrete under stress is of practical significance very much.Lot of domestic and international scholar studies concrete permeance property under the action of compressive stress, thinks that compressive stress is very big to the concrete permeability influence, can obviously increase concrete perviousness.
But xoncrete structure not only is subjected to action of compressive stress but also is subjected to action of pulling stress in actual engineering, and present stage also rarely has the people to study the equipment of concrete permeability energy under the tensile stress state.Existing research is many with to unloading again behind the sample load application, the permeance property of coming characterization sample then with the method for traditional test traffic.Under these circumstances, exist the process of a crack closure, this process is very big to the influence of concrete permeability energy, but can't characterize in test.In addition, test great majority carry out at the test that air or chloride permeability can be finished in these short time, just finish even if the water permeability test often also only continues a few hours.But the well-known infiltration of water in cement-based materials such as concrete is the process of a variation, along with the increase perviousness of time of penetration can change, so the permeability test of water needs to continue the long period usually.Not only can keep stress for a long time but also can measure infiltrative device under the concrete pulling stress state for a long time so author designed is a kind of.
Summary of the invention
In order to solve the shortcoming that can't under the tensile stress state that continues, study water permeation performance that exists in the prior art, the utility model provides the proving installation of concrete water permeability under a kind of tension, can solve the perviousness of xoncrete structure when being subjected to action of pulling stress and estimate.
The technical solution of the utility model is: concrete water permeability proving installation under a kind of tension, described device is made up of two block plates up and down, four jiaos of places at last lower steel plate respectively are provided with a hole, four apertures that are provided with that are right-angled intersection in the center, the distance of each aperture distance center equates, also be provided with a center pit in the center of upper steel plate, center pit is provided with step, the equal diameters of the blind hole of reserving on the diameter of bottom hole and the sample, the diameter coupling of the diameter of upper hole and detachable copper pipe, last lower steel plate is connected by four steel columns, one end of steel column is provided with screw thread and corresponding nut cooperates, and two steel plates can prolong that steel column is parallel to be moved up and down, also are with spring on steel column, spring is connected with a detachable copper pipe at the center pit of upper steel plate between two steel plates up and down.
Principle is as follows: by hex bolts concrete sample to be measured is connected between the two parallel steel plates, the blind hole of certain depth is reserved at the sample center, two blocks of parallel steel plates can move between four steel pipes, be continuously applied outside pressure by four pressing springs between the steel plate to two parallel steel plates with same characteristic features parameter, pressure to concrete sample effect tension, so just can make concrete sample be in lasting tension state by the pre-embedded bolt at two ends about the concrete sample then.Can calculate the characteristic parameter of spring according to the scantling parameter of spring, can calculate the size of acting force that spring applies according to the length of length of spring compressed, and adopt the spring of different characteristic parameter just can obtain different tensions.Stick foil gauge at concrete sample middle part, can read strain value different pulling force effects under with the definite stress of actual loaded on sample.On steel plate, reserve a blind hole that is connected with Anti-leakage instrument, the blind hole fills with water of reserving in the concrete sample can be applied the hydraulic pressure of different pressures to concrete by Anti-leakage instrument.Different time at interval in, measure the seepage flow of concrete side, just can estimate the permeance property of the concrete sample under different tensions and different hydraulic pressure.
It is the right cylinder of 150mm that concrete sample generally adopts the high 300mm of being, diameter.
Beneficial effect: 1. concrete water permeability apparatus under a kind of tension of providing of the utility model, both can apply lasting pulling force to concrete, can change water pressure again, by test seepage discharge, the evaluation that can draw the water permeability of concrete under different tensions very easily.
By to the spring characteristic parameter determine and size to concrete sample institute stress application is weighed in the measurement of amount of spring compression, and, can calculate the stress of actual loaded by on sample, pasting the mode of foil gauge.
3. each 1/3 part up and down of concrete sample has been avoided in the stress application process with pvc pipe and epoxy sealing, concrete sample upper and lower side stress is concentrated measurement is caused harmful effect.
4. can obtain different tensions by the spring that use has a different characteristic parameter, can measure of the influence of different tensions very easily the infiltration of concrete water.
Description of drawings
Fig. 1 is concrete sample test mode figure.
1. detachable copper pipes among the figure, 2. spring, 3. concrete sample, 4. pre-embedded bolt, 5. ponding dish, 6. reserving hole channel, 7. steel column, 8. lower steel plate, 9 foil gauges, 10. rubber ring, 11. upper steel plates.
Fig. 2 is the upper steel plate synoptic diagram.
Fig. 3 is the A-A face synoptic diagram of upper steel plate.
Fig. 4 is last shaped steel plate synoptic diagram.
Fig. 5 is last shaped steel plate A-A face synoptic diagram.
Fig. 6 is the lower steel plate synoptic diagram.
Embodiment
Embodiment 1
Explain with reference to Fig. 1～6 pair the utility model.
Concrete water permeability proving installation under a kind of tension, described device is by upper steel plate 11, lower steel plate 8 is formed, four jiaos of places at last lower steel plate respectively are provided with a hole, four apertures that are provided with that are right-angled intersection in the center, the distance of each aperture distance center equates, also be provided with a center pit in the center of upper steel plate 11, center pit is provided with step, the equal diameters of the blind hole of reserving on the diameter of bottom hole and the sample, the diameter coupling of the diameter of upper hole and detachable copper pipe 1, last lower steel plate is connected by four steel columns 7, one end of steel column 7 is provided with screw thread and corresponding nut cooperates, and two steel plates can prolong steel column 7 parallel moving up and down, also are with spring 2 on steel column 7, spring 2 is between two steel plates up and down, and the center pit of upper steel plate 11 is connected with a detachable copper pipe 1.
Using method is as follows:
The first step, make concrete sample: adopt circular municipal pvc pipe, length is 300mm, the diameter of pipe is 150mm, as the cover die of making concrete sample, pvc pipe is attached on the lower steel plate 8, make in the middle of the lower steel plate 8 four holes be uniformly distributed in the center of pipe face, four pre-embedded bolts are positioned in advance in four holes of lower steel plate 8, the degree of depth that four pre-embedded bolts of the nut of screwing on assurance are imbedded concrete sample is identical.The mode moulding that concrete sample adopts layering to vibrate, and embedment length is 200mm in concrete, diameter is the stainless-steel tube of 15mm, a prefabricated blind hole.When concrete formation to 2/3 height, imbed the pre-embedded bolt of four same degree of depth.Four holes of four jiaos with four steel pipes insert lower steel plate 8 are placed on the last shaped steel plate alignment shown in Fig. 4,5 on the concrete, and four bolts imbedding are adjusted the position, and making up and down, bolt is on the same axis as far as possible.The shape of the shape of last shaped steel plate and upper steel plate 8 is similar, and just center pit is a through hole, and the blind hole diameter of diameter and concrete sample equates.Concrete sample moulding form removal after a day, by the requirement of experimental standard GB/T50081-2002, at 20 ℃, maintenance was taken out after certain length of time in the environment of relative humidity 90%.For avoiding in the stress application process, concrete sample upper and lower side stress is concentrated measurement is caused harmful effect, with pvc pipe and epoxy resin with sample 1/3 part sealing up and down; The error that measurement is caused for the defective that guarantees that sample has only side infiltration, avoid sample lower surface bolt to imbed to cause seals the bottom surface of sample with epoxy resin.In order to make the sample upper surface smooth and reach the effect that discharges water, the upper surface of concrete sample is sealed with epoxy resin, and around the sample reserving hole channel, be stained with rubber ring to reach sealing and good waterproof effect.
Second step, concrete sample is assembled on the concrete water permeability proving installation: four steel pipes are inserted in four holes of four jiaos of lower steel plates, and it is four springs with same characteristic features parameter are placed on it, ponding dish 5 is placed in the concrete sample middle part, put upper steel plate 11, tighten four nuts on the steel pipe, spring is exerted pressure makes upper steel plate 11 closely contact with sample 3 upper surfaces.With four pre-embedded bolts that are embedded in sample upper surface nut of also screwing on, concrete sample is fixed on up and down between two block plates.
The 3rd step, stick three foil gauges at the middle part of concrete sample, electric wire strain gauge is received on the foil gauge, read the strain value of this moment, electric wire strain gauge is returned to zero.Then the nut on four steel pipes at four jiaos of places is unscrewed, made tension by being added on the sample that pre-embedded bolt continues.After a period of stabilisation, read the strain value of this moment.
The 4th step was screwed to copper pipe 1 in the hole of the blind hole correspondence on the upper steel plate 11 and on the concrete sample, regulated water pressure by Anti-leakage instrument, measured the seepage flow of gathering ground in the ponding dish of concrete sample middle part in the different time intervals;
The 5th step, change the spring that another group has the different characteristic parameter then, the repeated test step, after just spring being finished changing, again upper steel plate is put, tighten four nuts on the steel pipe, spring is exerted pressure makes upper steel plate closely contact with specimen surface, with four pre-embedded bolts that are embedded in sample upper surface nut of also screwing on, concrete sample is fixed on up and down between two block plates.The back is the same with the 5th step with the 4th step.So just can obtain different tensions,, just can measure easily that different hydraulic pressure have influenced concrete under different tensions again by adjusting the hydraulic pressure of Anti-leakage instrument by spring with different characteristic parameter.
Use device of the present utility model, under 1MPa hydraulic pressure, measure the infiltration coefficient (K) of different water-binder ratios (W/b) concrete sample under different tension level.By length of spring compressed (Δ l) measurement of length to the calculating of spring rate (k) and when loading, determine the tension (F) that spring loads test specimen; By measurement, determine the actual tension of bearing of test specimen (Ft) to test specimen strain value (ε) and elastic modulus; Its result is shown in table 1.1,1.2,1.3.
Test findings under the test specimen pulling force effect of table 1.1 W/b=0.4
Test findings under the test specimen pulling force effect of table 1.2 W/b=0.5
The spring parameter that table 1.3 adopted
| F/(MPa) | 0 | 0.5 | 1.0 | 1.5 |
| k/(N/mm) | 0 | 22.1 | 40.1 | 55.2 |
| Δl/(mm) | 0 | 100 | 110 | 120 |
Illustrate that this equipment can test out the concrete permeability energy under the different tensions easily.
Claims (1)
1. concrete water permeability proving installation under the tension, it is characterized in that described device is made up of two block plates up and down, four jiaos of places at last lower steel plate respectively are provided with a hole, four apertures that are provided with that are right-angled intersection in the center, the distance of each aperture distance center equates, also be provided with a center pit in the center of upper steel plate, center pit is a stepped hole, the equal diameters of the blind hole of reserving on the diameter of bottom hole and the sample, the diameter coupling of the diameter of upper hole and detachable copper pipe, last lower steel plate is connected by four steel columns, one end of steel column is provided with screw thread and corresponding nut cooperates, and two steel plates can prolong that steel column is parallel to be moved up and down, also are with spring on steel column, spring is between two steel plates up and down, and the center pit of upper steel plate is connected with a detachable copper pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201607469U CN201266163Y (en) | 2008-10-17 | 2008-10-17 | Test device for tension stress lower concrete water permeability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201607469U CN201266163Y (en) | 2008-10-17 | 2008-10-17 | Test device for tension stress lower concrete water permeability |
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| Publication Number | Publication Date |
|---|---|
| CN201266163Y true CN201266163Y (en) | 2009-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008201607469U Expired - Fee Related CN201266163Y (en) | 2008-10-17 | 2008-10-17 | Test device for tension stress lower concrete water permeability |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799396A (en) * | 2010-04-14 | 2010-08-11 | 浙江省水利河口研究院 | Concrete durability water seepage collection instrument |
-
2008
- 2008-10-17 CN CNU2008201607469U patent/CN201266163Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799396A (en) * | 2010-04-14 | 2010-08-11 | 浙江省水利河口研究院 | Concrete durability water seepage collection instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090701 Termination date: 20111017 |