CN2879170Y - Direct cutting instrument - Google Patents
Direct cutting instrument Download PDFInfo
- Publication number
- CN2879170Y CN2879170Y CNU2006200499260U CN200620049926U CN2879170Y CN 2879170 Y CN2879170 Y CN 2879170Y CN U2006200499260 U CNU2006200499260 U CN U2006200499260U CN 200620049926 U CN200620049926 U CN 200620049926U CN 2879170 Y CN2879170 Y CN 2879170Y
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- box
- shear
- utility
- direct
- dynamometer
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Abstract
The utility model associates a direct shear apparatus for measuring the shear strength of the soil sample. The direct shear apparatus provided by the utility model comprises a roller lead screw (1), a shear box, a base (2), and a dynamometer. The shear box consists of an upper case (6) and a moving lower case (10), with the clearance (17) between upper and lower cases. The improvement of shear box by the utility model eliminates the errors incurred by the friction force and ensures that the tested shear force really reflects the actual value of the soil sample.
Description
Technical field
The utility model relates to the direct shear apparatus of measuring the soil sample shearing strength.
Background technology
Direct shear test is the simplest method of measuring the shearing strength of soil, and what it was measured is that soil sample is scheduled to the shearing strength on the shear surface.The employed instrument of direct shear test is called direct shear apparatus, and by the difference of loading mode, direct shear apparatus can be divided into two kinds of strain control type and Stress Control formulas.The former promotes sample with the constant speed level to produce displacement and measure corresponding shear stress; The latter then is that classification applies horizontal shearing stress to sample, measures corresponding displacement simultaneously.
What China generally adopted at present is strain control type direct shear apparatus, and the critical piece (see figure 1) shear box of this instrument is made up of fixing last box 6 and movable following box 10, and following box is fixed on the base 2, and base 2 is placed on the steel ball 11, can slide in the horizontal direction.Sample 7 is placed in the box up and down between two permeable stones 3.During test, apply a certain normal stress s by lever system by pressurizing piston 5 and 3 pairs of samples 7 of permeable stone, measure its size by micrometer gauge 4, promote box 10 down by roller bearing screw mandrel 1 constant speed then, sample 7 is cut until destruction on the surface level between the box up and down on the edge, and the big I of shearing force t is measured by the dynamometer that contacts with last box.Dynamometer comprises measure one's own ability ring 9 and micrometer gauge 8.
The box up and down of traditional direct shear apparatus is to be buckled together, and the friction between the box has strengthened the shear resistance of sample up and down, the true shear resistance of the sample of failing correctly to reflect.In addition, because base 2 bottoms are equipped with ball, when shearing, following box mobile is by the scrolling realization of ball, and friction force is bigger between ball and the surface level; Therefore bring error to experiment.
On the other hand, line slideway is a kind of prior art.When movement parts when holding the guiding element moving linearly, the guide rail that holds on the guiding element plays supporting and guiding, i.e. support motion spare and guarantee that movement parts under the effect of external force, carries out rectilinear motion along given direction.Guide rail has higher guiding accuracy simultaneously, and it is light steady to move.Wherein rolling linear guide is to put into suitable steel ball between slide block and guide rail, makes the sliding friction between slide block and the guide rail become rolling friction, reduces the friction of motion resistance between the two greatly, and its friction factor is between 0.002～0.005.Usually it forms (seeing Fig. 2,3) by guide rail (18), slide block (19), steel ball (20), back device (14), retainer (15), end cover (16) and baffle plate (17) etc.When guide rail and slide block are done relative motion, steel ball four raceways that just process on the guide rail is hardened and accurate grinding processes roll, enter raceway again after slide block end steel ball enters the back hole by back device (back device) again, steel ball carries out rolling movement like this again and again.The dust seal end cap is equipped with at back device two ends, can prevent effectively that dust, bits end from entering slide block inside.
In traditional direct shear apparatus, shear box places between dynamometer and the roller bearing screw mandrel 1, and like this, dynamometer can not well guarantee the directional precision of power away from roller bearing screw mandrel 1, has also influenced the precision of shear resistance.
Summary of the invention
The direct shear apparatus that the utility model provides, comprise that roller bearing screw mandrel (1), shear box, base (2), the ring (9) of measuring one's own ability, micrometer gauge (8), shear box be made up of last box (6) and movable following box (10), wherein go up between box (6) and the following box (10) gapped (17).
Preferred gap between the box up and down is 0.2mm.
In order to eliminate the influence of bottom ball friction, base can be fixed on the line slideway (12) measuring.
Further improving is dynamometer and roller bearing screw mandrel the same side at shear box.
The utility model has been eliminated the error of bringing because of friction by improvement and introducing line slideway to shear box; With dynamometer the same side, eliminated traditional boxshear apparatus because the measuring error that both position deviations bring makes the shearing force that measures truly reflect the actual value of soil sample at the roller bearing screw mandrel.
Description of drawings
Fig. 1 is the structural drawing of direct shear apparatus in the prior art;
Fig. 2 is the structural drawing of prior art cathetus guide rail;
Fig. 3 is the structural drawing of prior art cathetus guide rail;
Fig. 4 is a shear box partial sectional view among the utility model embodiment;
Fig. 5 is the structural drawing of the utility model embodiment.
Embodiment
Shown in Fig. 4,5, the direct shear apparatus that the utility model embodiment provides comprises roller bearing screw mandrel 1, shear box, base 2, linear rolling track 12, the ring 9 of measuring one's own ability, micrometer gauge 8.Wherein shear box is made up of fixing last box 6 and movable following box 10, and the gap 17 of 0.2mm is arranged between the upper and lower box.Following box 10 is fixed on the base 2, and base 2 is fixed on the linear rolling track 12.Dynamometer and roller bearing screw mandrel 1 be in the same side of shear box, and also be fixed on the linear rolling track 13.
Claims (4)
1, direct shear apparatus comprises roller bearing screw mandrel (1), shear box, base (2), dynamometer, wherein shear box is made up of last box (6) and movable following box (10), it is characterized in that between box (6) and the following box (10) gapped (17).
2, direct shear apparatus according to claim 1 is characterized in that the gap between box (6) and the following box (10) is 0.2mm.
3, direct shear apparatus according to claim 1 and 2 is characterized in that base (2) is fixed on the line slideway (12,13).
4, direct shear apparatus according to claim 1 and 2 is characterized in that dynamometer and roller bearing screw mandrel (1) the same side at shear box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200499260U CN2879170Y (en) | 2006-01-25 | 2006-01-25 | Direct cutting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200499260U CN2879170Y (en) | 2006-01-25 | 2006-01-25 | Direct cutting instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2879170Y true CN2879170Y (en) | 2007-03-14 |
Family
ID=37861590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200499260U Expired - Fee Related CN2879170Y (en) | 2006-01-25 | 2006-01-25 | Direct cutting instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2879170Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344508A (en) * | 2013-07-25 | 2013-10-09 | 重庆交通大学 | Device and method for testing shear characteristics of steel-soil interface in consideration of thickness of shear band |
| CN103776696A (en) * | 2014-03-03 | 2014-05-07 | 中国科学院地质与地球物理研究所 | Drawing and shear testing device for geosynthetics |
| CN104819903A (en) * | 2015-01-20 | 2015-08-05 | 中山大学 | Soil direct shear rheometer |
| CN106248506A (en) * | 2016-09-27 | 2016-12-21 | 山东大学 | A kind of visualization direct shear apparatus device and method |
-
2006
- 2006-01-25 CN CNU2006200499260U patent/CN2879170Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344508A (en) * | 2013-07-25 | 2013-10-09 | 重庆交通大学 | Device and method for testing shear characteristics of steel-soil interface in consideration of thickness of shear band |
| CN103344508B (en) * | 2013-07-25 | 2016-06-08 | 重庆交通大学 | A kind of steel-Soil Interface shear property test device and method considering shear bandwidth |
| CN103776696A (en) * | 2014-03-03 | 2014-05-07 | 中国科学院地质与地球物理研究所 | Drawing and shear testing device for geosynthetics |
| CN103776696B (en) * | 2014-03-03 | 2016-05-04 | 中国科学院地质与地球物理研究所 | A kind of geosynthetics cut resistance test method |
| CN104819903A (en) * | 2015-01-20 | 2015-08-05 | 中山大学 | Soil direct shear rheometer |
| CN106248506A (en) * | 2016-09-27 | 2016-12-21 | 山东大学 | A kind of visualization direct shear apparatus device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |