CN201266152Y - Shearing instrument for angle variable board - Google Patents
Shearing instrument for angle variable board Download PDFInfo
- Publication number
- CN201266152Y CN201266152Y CNU2008200680255U CN200820068025U CN201266152Y CN 201266152 Y CN201266152 Y CN 201266152Y CN U2008200680255 U CNU2008200680255 U CN U2008200680255U CN 200820068025 U CN200820068025 U CN 200820068025U CN 201266152 Y CN201266152 Y CN 201266152Y
- Authority
- CN
- China
- Prior art keywords
- angle
- plate
- roller bearing
- clamping plate
- angle plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a variable-angle plate cutting instrument which comprises plywood, a columniform cushion block, a variable-angle plate, a right-angle liner plate, a rolling shaft, a rolling shaft frame, bolts and nuts. The utility model is characterized in that the variable-angle plate has a circular arc-shaped edge, and the size of the arc-shaped edge is matched with that of the arc-shaped edge of the plywood; the edge part of the variable-angle plate provided with annular holes is plugged into a groove of the plywood; the variable-angle plate is fixed on the plywood by the columniform cushion block, the bolts and the nuts; the right-angle liner plate at the inner side of the variable-angle plate directly contacts a rock sample; the rolling shaft is installed on the rolling shaft frame, and the rolling shaft is a columniform rod with the diameter at the middle more than the diameter at two ends. The utility model not only can adjust the angle of the cutting face of a sample very flexibly, but also has favorable self-stability and good integrity and is durable.
Description
Technical field
The utility model relates to the rock mechanics experiment technical field, more specifically relate to a kind of indoor angle boxshear apparatus of measuring the disconnected intensity of shear of rock, utilize pressure testing machine to apply vertical load, shearing inclination by modifier obtains the square sillar when destroying different normal stress and shear stress combination, thereby draw out strength envelope, obtain corresponding rock strength parameter.
Background technology
The shop experiment method commonly used of measuring the disconnected intensity of shear of rock has: direct shear test, angle shear test and triaxial compression test.The angle shear test is wherein the simplest a kind of method, has advantages such as equipment is simple, easy and simple to handle, expense is low.The angle shear test utilizes pressure testing machine to apply vertical load, by special anchor clamps the sillar sample is cut off along a shear surface, normal stress and shear stress combination in the time of can obtaining a series of sillar shear failure by the angle of inclination that changes shear surface, draw the relation curve (being strength envelope) between these two kinds of stress, can be in the hope of mechanics parameters such as the angle of internal friction of rock and cohesion.
" highway engineering building stones testing regulations " (JTJ054-94), " rock mass mechanics " (publishing house of Tongji University of Shen Mingrong chief editor, 1999) and " rock mechanics " (publishing house of University Of Chongqing of chief editor such as Wu Delun, 2002) recommended similar angle plate wedge shape boxshear apparatus, this type of boxshear apparatus comes adjusting angle by the backing plate of changing different angles, exists angle can not regulate, install the shortcoming of globality difference continuously." rock mechanics and engineering " (Science Press of Cai Meifeng chief editor, 2002) also provided a kind of angle mould compression shear test device, the adjusting of this design factors is to realize by the clapboard of changing different angles, the shortcoming that also has continuously adjusting angle, device globality difference, the center that can cause sample and anchor clamps simultaneously changes with the change of angle, cause device deviation of gravity center center line, cause device to topple over easily.Li Zhi is firm, " engineering geology outline " (publishing house of China University of Geosciences of Yang Yuyun chief editor, 1994) provided a kind of angle board clamp, tentatively solved angle and can not regulate problem with deviation of gravity center continuously, how to have made the angle plate keep in experimentation that respective angles is constant, the subject matter of increase anchor clamps stability but exist.(laboratory study and exploration such as Zhu Dinghua, the 20th the 1st phase of volume, 2001) developed a kind of angle boxshear apparatus that changes shearing inclination by the various combination that changes semi arch, though obtained good test effect through checking, but exist the instrument key position shortcoming of wearing and tearing easily, can cause the device shortening in serviceable life.
Summary of the invention
In order to overcome the main deficiency that present angle plate shearing test device exists, the purpose of this utility model is to be to provide a kind of angle plate boxshear apparatus, and this instrument not only can be regulated the angle of sample shear surface very neatly, and good self-stable ability is arranged, good integrity is durable in use.
The technical scheme that its technical matters that solves the utility model adopts is:
This boxshear apparatus comprises clamping plate, cylindrical cushion block, the angle plate, the right angle backing plate, roller bearing, the roller bearing frame, bolt, nut, it is characterized in that: cylindrical cushion block passes through bolt, the fastening angle plate of nut also is fixed on the clamping plate, right angle backing plate in the inboard of angle plate directly contacts with rock sample, on the roller bearing frame, roller bearing is housed, angle plate thick middle thin edge, the angle plate is a radiused edges, and the size on the size on its arc border and clamping plate arc border is complementary, the groove of clamping plate is filled in the marginal portion that the angle plate has an annular hole, at cylindrical cushion block, the auxiliary angle plate that clamps down of bolt and nut.This boxshear apparatus has adopted a kind of right angle backing plate that can change easily directly to contact with rock sample.The shape of single roller bearing is a columniform bar, and the diameter of center section is greater than two ends.The both sides, front and back of roller bearing frame have the equally spaced circular hole of row's slightly larger in diameter outstanding small column diameter in the roller bearing two ends, and the edge of roller bearing frame bottom is higher than the minimum point of roller bearing.
For the shear surface that makes the square rock sample can transform to arbitrarily angled, and center of gravity does not depart from the center line of whole device after the translation-angle, the groove at the annular recess at the edge of angle plate, clamping plate middle part and edge thereof has all adopted the design of circular arc in the utility model, and whole device is that the vertical plane about the place, center of rock sample is the planar central symmetry, and the center of circle on all circular arc borders all is the center of rock sample in the device.
For angle plate in the warranty test pressure process can not rotate, the utility model has adopted the angle plate of a kind of thick middle, thin edge, and at the marginal portion of angle plate open loop shape hole, assisting down of cylindrical cushion block, bolt and nut, the angle plate is clamped on the clamping plate that have groove.
In order to increase the scope of application of the present utility model and to increase its serviceable life, the utility model has adopted a kind of right angle backing plate.The concrete effect of this right angle backing plate has two: the one, and the right angle backing plate of changing different-thickness goes for the test of the square rock sample of the different length of sides, increase thickness and can do the test of reduced size sample, reduce the test that thickness can be made the sample of large-size; The 2nd, avoid the direct contact wear of rock sample and angle plate, after right angle backing plate serious wear, only need to change corresponding cushion block, help extension fixture serviceable life, reduce cost, and can improve test accuracy effectively.
In order to reduce the level friction of device along sample detrusion direction to greatest extent, the utility model has adopted a kind of special roller bearing bindiny mechanism.The shape of single roller bearing is a columniform bar, and the diameter of center section is greater than two ends, and the outstanding small column in two ends plays the effect of location roller bearing.The both sides, front and back of roller bearing frame have row's slightly larger in diameter in the equally spaced circular hole of outstanding small column, freely roll independently to guarantee that roller bearing can be posted on the lower platen of testing machine.The edge of roller bearing frame bottom is higher than the minimum point of roller bearing, avoids taking place the friction of roller bearing frame and testing machine lower platen.
Major advantage of the present utility model has:
1) realized the continuous adjusting of sample shear surface angle;
2) good integrity, simple in structure.Do not need to process the razor-edge liner of multiple angles;
3) good self-stability is arranged.Whole device center of gravity can disalignment after angle changed;
4) applied widely.Go for the square sample of the different length of sides;
5) whole service life is long.The parts that right angle backing plate, bolt, nut etc. are easy to damage can be changed easily;
Description of drawings
Fig. 1 is that a kind of three-dimensional of angle plate boxshear apparatus splits synoptic diagram.
Fig. 2 is a kind of three-dimensional assembling synoptic diagram of angle plate boxshear apparatus.
Fig. 3 is a kind of plan front view of angle plate boxshear apparatus.
The name of number in the figure correspondence is called:
1-the first clamping plate, 2-the first bolt, 3-the second bolt, 4-the first cylindrical cushion block, 5-the second cylindrical cushion block, 6-the first angle plate, 7-the first right angle backing plate, 8-rock sample, 9-the second right angle backing plate, 10-the second angle plate, 11-the second clamping plate, 12-the three cylindrical shape cushion block, 13-the four cylindrical cushion block, 14-the three bolt, 15-the four bolt, 16-roller bearing, 17-roller bearing frame, 18-the first nut, 19-the second nut, 20-the three nut, 21-the four nut.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
According to Fig. 1, Fig. 2, Fig. 3 as can be known, this boxshear apparatus comprises first, second clamping plate 1,11, first, second, third, fourth cylindrical cushion block 4,5,12,13, first, second angle plate 6,10, first, second right angle backing plate 7,9, roller bearing 16, roller bearing frame 17, first, second, third, fourth bolt 2,3,14,15, first, second, third, fourth nut 18,19,20,21, and the rock sample 8 that is positioned at the device middle part is objective for implementation of the present utility model.
First, the second angle plate 6,10 is radiused edges, the size on arc border and first, second clamping plate 1, the size on 11 arc borders is complementary, first, the second angle plate 6,10 marginal portions that have annular hole fill in first respectively, second clamping plate 1,11 groove, first, second, the 3rd, the 4th cylindrical cushion block 4,5,12,13, first, second, the 3rd, the 4th bolt 2,3,14,15 and first, second, the 3rd, the 4th nut 18,19,20,21 with first, the second angle plate 6,10 are fixed on first, second clamping plate 1, on 11, first, the second angle plate 6,10 inboard first, the second right angle backing plate 7,9 directly contact with rock sample 8, and roller bearing 16 is housed on the roller bearing frame 17.
The shape of roller bearing 16 is columniform bars, and middle diameter is greater than two ends.
The both sides, front and back of roller bearing frame 17 have the equally spaced circular hole of row's diameter greater than the outstanding small column diameter in roller bearing 16 two ends, and the edge of roller bearing frame 17 bottoms is higher than the low spot of roller bearing 16.
There is perforate both sides, first clamping plate, 1 front and back, and there is perforate both sides, second clamping plate, 11 front and back.
The first angle plate 6 is filled in first clamping plate 1, and first, second cylindrical cushion block 4,5 is filled in two holes of first clamping plate, 1 front side respectively, and first, second bolt 2,3 is filled in first, second cylinder cushion block 4,5 respectively.
The second angle plate 10 is filled in two holes that second clamping plate the 11, the three, the 4th cylindrical cushion block 12,13 is filled in second clamping plate, 11 front sides respectively, and the 3rd, the 4th bolt 20,21 is filled in the 3rd, the 4th cylinder cushion block 12,13 respectively.
The first right angle backing plate 7 is attached to the downside of first clamping plate 6, and the second right angle cushion block 9 is attached to the upside of second clamping plate 11.
The feature and the effect thereof of each parts at first are described according to Fig. 1:
There is perforate both sides, first clamping plate, 1 front and back, and the position in hole should be complementary with the annular hole at the first angle plate, 6 edges, and principle is not influence the first angle plate 6 to turn to enough angles.The diameter of front-side holes and first, second cylindrical cushion block 4,5 are complementary, and the diameter of back side opening and first, second bolt 2,3 are complementary.The middle part open loop connected in star of first clamping plate 1, the thickness of the width of groove and the first angle plate, 6 edge outshots is complementary, and purpose is the annular groove that the assurance first angle plate 6 can be filled in first clamping plate 1 smoothly; The degree of depth of groove should be greater than the marginal portion of the first angle plate 6 along diametric width, purpose is to guarantee that the first angle plate, 6 middle parts can contact with the curved edge face of 1 liang of side bottom of first clamping plate well than the curved edge face of thickness portion, to increase the stability and the test accuracy of device.
There is perforate both sides, second clamping plate, 11 front and back, and the position in hole should be complementary with the annular hole at the second angle plate, 10 edges, and principle is not influence the second angle plate 10 to turn to enough angles.The diameter of front-side holes and the 3rd, the 4th cylindrical cushion block 12,13 are complementary, and the diameter of back side opening and the 3rd, the 4th bolt 14,15 are complementary.The middle part open loop connected in star of second clamping plate 11, the thickness of the width of groove and the second angle plate, 10 edge outshots is complementary, and purpose is the annular groove that the assurance second angle plate 10 can be filled in second clamping plate 11 smoothly; The degree of depth of groove should be greater than the marginal portion of the second angle plate 10 along diametric width, purpose is to guarantee that the second angle plate, 10 middle parts can contact with the curved edge face of 11 liang of side bottoms of second clamping plate well than the curved edge face of thickness portion, to increase the stability and the test accuracy of device.
First, second right angle backing plate 7,9 can be changed in this device, its effect has two: the one, and first, second right angle backing plate 7,9 of changing different-thickness goes for the test of the square rock sample 8 of the different length of sides, increase thickness and can do the test of reduced size sample, reduce the test that thickness can be made the sample of large-size; The 2nd, avoid the direct contact wear of rock sample 8 and first, second angle plate 6,10, after first, second right angle backing plate 7,9 serious wear, only need to change corresponding cushion block, its effect be extension fixture serviceable life, reduce cost, and can effectively improve test accuracy.
The shape of single roller bearing 16 is columniform bars, and the diameter of center section is greater than two ends, and the outstanding small column in two ends plays the effect of location roller bearing 16.The both sides, front and back of roller bearing frame 17 have row's slightly larger in diameter in the equally spaced circular hole of outstanding small column, freely roll independently to guarantee that roller bearing 16 can be posted on the lower platen of testing machine.Should guarantee simultaneously roller bearing 16 assemble after the edge of roller bearing frame 17 bottoms be higher than the minimum point (as shown in Figure 3) of roller bearing 16, to avoid the direct friction of roller bearing frame 17 and testing machine lower platen.The purpose of taking these measures is to reduce the level friction of device along the detrusion direction to greatest extent, increases test accuracy.
The connected mode and the effect thereof of each parts are described according to Fig. 2, Fig. 3 below:
The structure of roller bearing more than 16 (refers to first, second clamping plate 1,11, first, second, third, fourth cylindrical cushion block 4,5,12,13, first, second angle plate 6,10, first, second right angle backing plate 7,9 and is the planar central symmetry about the perpendicular at the place, center of rock sample 8, the center of circle on all circular arc borders all is the center of rock sample 8 in the boxshear apparatus, its effect is that the center of gravity that guarantees first, second angle plate 6,10 whole device after adjusting different angles can not depart from center line, and the angle of sample shear surface can be regulated continuously.
The first angle plate 6 is filled in first clamping plate 1, first, second cylindrical cushion block 4,5 is filled in two holes of first clamping plate, 1 front side respectively, first, second bolt 2,3 is filled in first, second cylindrical cushion block 4,5 respectively, pass the annular hole and first clamping plate 1 at the edge of the first angle plate 6 then, first, second nut 18,19 of screwing on respectively at last.The effect of first, second bolt 2,3, first, second cylindrical cushion block 4,5 and first, second nut 18,19 is: clamp the first angle plate 1 to guarantee that the first angle plate 6 can not rotate in test pressure process.
The second angle plate 10 is filled in second clamping plate 11, the the 3rd, the 4th cylindrical cushion block 12,13 is filled in two holes of second clamping plate, 11 front sides respectively, the the 3rd, the 4th bolt 20,21 is filled in the 3rd, the 4th cylindrical cushion block 12,13 respectively, pass the annular hole and second clamping plate 11 at the edge of the second angle plate 10 then, the 3rd, the 4th nut 20,21 of screwing on respectively at last.Three, the effect of the 4th bolt the 14,15, the 3rd, the 4th cylindrical cushion block 12,13 and the 3rd, the 4th nut 20,21 is: clamp the second angle plate 11 to guarantee that the second angle plate 10 can not rotate in test pressure process.
The first right angle backing plate 7 is posted on the downside of first clamping plate 6, and the second right angle backing plate 9 is posted on the upside of second clamping plate 11.The inboard of these two backing plates contacts with rock sample 8, is the person that directly do not apply of the suffered load of sample.
A typical process of the test is as follows:
1) adjust the shear surface angle: the scale mark (each scale represent 5 degree in the accompanying drawing) of auxiliary adjustment angle plate angle is carved with on the surface of device, with reference to these scale marks roughly angle is arrived in the angle coarse adjustment of first, second angle plate 6,10.Then the square standard sample is put into the position (as shown in Figure 2) of rock sample 8, use amount hornwork and L-square carry out the fine adjustment of shear surface angle, tighten first, second, third, fourth all nuts 18,19,20,21 then and can not rotate in process of the test to guarantee first, second angle plate 6,10.
2) lay sample: the square standard sample in the step 1 is replaced with the rock sample 8 that to test.Protect with plank or other sheet material around will installing, destroy suddenly to avoid test specimen, device skids off.The device superstructure can be bundled on the top board of pressing machine in case of necessity.
3) load application: start pressure testing machine and load,, note failing load up to the destruction that rock sample 8 takes place along shear surface.
4) revision test: according to the test design requirement, repeating step 2-3 carries out the test of some rock samples with this angle.
5) translation-angle: the shearing inclination of first, second angle plate 6,10 of conversion, repeating step 1-4 test, obtain the sample failing load under the different angles.
6) arrangement test figure.
Claims (7)
1, a kind of angle plate boxshear apparatus, it comprises first, second clamping plate (1,11), first, the second angle plate (6,10), first, the second right angle cushion block (7,9), roller bearing (16), roller bearing frame (17), it is characterized in that: first, the second angle plate (6,10) be radiused edges, the size on arc border and first, second clamping plate (1,11) size on arc border is complementary, first, the second angle plate (6,10) marginal portion that has annular hole fills in first respectively, second clamping plate (1,11) groove, first, second, the 3rd, the 4th cylindrical cushion block (4,5,12,13), first, second, the 3rd, the 4th bolt (2,3,14,15) and first, second, the 3rd, the 4th nut (18,19,20,21) with first, the second angle plate (6,10) be fixed on first, second clamping plate (1,11) on, first, the second angle plate (6,10) inboard first, the second right angle backing plate (7,9) directly contact with rock sample (8), roller bearing (16) is housed on the roller bearing frame (17).
2, a kind of angle plate boxshear apparatus according to claim 1, it is characterized in that: the shape of roller bearing (16) is columniform bar, middle diameter is greater than two ends.
3, a kind of angle plate boxshear apparatus according to claim 1, it is characterized in that: the both sides, front and back of roller bearing frame (17) have the equally spaced circular hole of row's diameter greater than the outstanding small column diameter in roller bearing (16) two ends, and the edge of roller bearing frame (17) bottom is higher than the low spot of roller bearing (16).
4, a kind of angle plate boxshear apparatus according to claim 1 is characterized in that: there is perforate both sides before and after first clamping plate (1), and there is perforate both sides before and after second clamping plate (11).
5, a kind of angle plate boxshear apparatus according to claim 1, it is characterized in that: the first angle plate (6) is filled in first clamping plate (1), first, second cylindrical cushion block (4,5) is filled in two holes of first clamping plate (1) front side respectively, and first, second bolt (2,3) is filled in first, second cylinder cushion block (4,5) respectively.
6, a kind of angle plate boxshear apparatus according to claim 1, it is characterized in that: the second angle plate (10) is filled in second clamping plate (11), three, the 4th cylindrical cushion block (12,13) is filled in two holes of second clamping plate (11) front side respectively, and the 3rd, the 4th bolt (20,21) is filled in the 3rd, the 4th cylinder cushion block (12,13) respectively.
7, a kind of angle plate boxshear apparatus according to claim 1, it is characterized in that: the first right angle backing plate (7) is attached to the downside of first clamping plate (6), and the second right angle cushion block (9) is attached to the upside of second clamping plate (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200680255U CN201266152Y (en) | 2008-06-24 | 2008-06-24 | Shearing instrument for angle variable board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200680255U CN201266152Y (en) | 2008-06-24 | 2008-06-24 | Shearing instrument for angle variable board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201266152Y true CN201266152Y (en) | 2009-07-01 |
Family
ID=40832526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200680255U Expired - Fee Related CN201266152Y (en) | 2008-06-24 | 2008-06-24 | Shearing instrument for angle variable board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201266152Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674696A (en) * | 2013-12-26 | 2014-03-26 | 哈尔滨工业大学 | Multi-angle large-deformation shear test fixture of structure stress absorption layer of pavement |
| CN106290004A (en) * | 2016-07-26 | 2017-01-04 | 华南农业大学 | A kind of laminated timber that intersects rolls shear test apparatus |
| CN107685876A (en) * | 2017-07-28 | 2018-02-13 | 中国航空工业集团公司西安飞机设计研究所 | Adjustable wheel loaded member for articulated landing gear |
| CN110823720A (en) * | 2019-11-20 | 2020-02-21 | 清华大学 | Direct shear test method for natural cemented filling rock fracture under high temperature condition |
| CN114109457A (en) * | 2021-10-21 | 2022-03-01 | 湖南科技大学 | Coal seam angle-variable shearing device with synchronous self-adaptive cutting cushion blocks |
-
2008
- 2008-06-24 CN CNU2008200680255U patent/CN201266152Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674696A (en) * | 2013-12-26 | 2014-03-26 | 哈尔滨工业大学 | Multi-angle large-deformation shear test fixture of structure stress absorption layer of pavement |
| CN106290004A (en) * | 2016-07-26 | 2017-01-04 | 华南农业大学 | A kind of laminated timber that intersects rolls shear test apparatus |
| CN107685876A (en) * | 2017-07-28 | 2018-02-13 | 中国航空工业集团公司西安飞机设计研究所 | Adjustable wheel loaded member for articulated landing gear |
| CN110823720A (en) * | 2019-11-20 | 2020-02-21 | 清华大学 | Direct shear test method for natural cemented filling rock fracture under high temperature condition |
| CN114109457A (en) * | 2021-10-21 | 2022-03-01 | 湖南科技大学 | Coal seam angle-variable shearing device with synchronous self-adaptive cutting cushion blocks |
| CN114109457B (en) * | 2021-10-21 | 2023-12-08 | 湖南科技大学 | Coal seam variable angle shearing device with synchronous self-adaptive cutting cushion block |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101315320B (en) | Compression shear test device | |
| CN201266153Y (en) | Angle variable board shearing device for cylindrical sample | |
| CN201266152Y (en) | Shearing instrument for angle variable board | |
| JP2019045219A (en) | Shearing force testing device | |
| US6205637B1 (en) | Truss table with integrated positioning stops | |
| CN201673091U (en) | Auxiliary loading device for compressed column test | |
| CN102680319A (en) | Test fixture for compression shear of symmetric sandwich structure | |
| CN102426143A (en) | Method and device for detecting compressive strength of concrete by shearing resistance method | |
| AU2002223066A1 (en) | Device and method for calibrating a multiple-roller flattener | |
| JP5987784B2 (en) | Press mold | |
| US5702095A (en) | Truss table with integrated positioning stops | |
| AU2012232708B2 (en) | Differential deflection measurement in structural members | |
| CN206671548U (en) | Ultrasonic sensor fixture | |
| CN208057628U (en) | The mounting structure of concrete stress strain-Sensing device | |
| US8033535B2 (en) | Stair stringer assembly bench | |
| US1432485A (en) | Mortise gauge | |
| CN212419768U (en) | Drilling machine anchor clamps | |
| CN203561542U (en) | Improved concrete shear compression apparatus | |
| CN103217514A (en) | Eccentricity vertical loading device acting on column | |
| CN207528146U (en) | A kind of long axis length detection device | |
| CN202141642U (en) | Sandwich structure compression shear test fixture capable of easily testing sample deformation | |
| KR20110000623U (en) | Steel sheet pile manufactory and accordingly steel sheet pile | |
| KR102548792B1 (en) | Shear strength test equipment for a 3D printed concrete member | |
| CN106290004A (en) | A kind of laminated timber that intersects rolls shear test apparatus | |
| CN103512739B (en) | Effective prestressed self equilibrium systems is applied to hardware |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090701 Termination date: 20140624 |
|
| EXPY | Termination of patent right or utility model |