CN209841536U - Rock three-point bending clamp for testing size effect - Google Patents
Rock three-point bending clamp for testing size effect Download PDFInfo
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- CN209841536U CN209841536U CN201920442178.XU CN201920442178U CN209841536U CN 209841536 U CN209841536 U CN 209841536U CN 201920442178 U CN201920442178 U CN 201920442178U CN 209841536 U CN209841536 U CN 209841536U
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Abstract
The utility model discloses a rock three-point bending fixture for size effect test can include the pressure head part and set up in the support portion of pressure head part below, the pressure head part includes pressure head body and compression roller, the compression roller sets up the bottom of pressure head body; the supporting part comprises a supporting roller, a movable support, a base and a guide rail platform, wherein two ends of the guide rail platform are respectively provided with one movable support, the movable support passes through the base and is connected with the guide rail platform, the supporting roller is further arranged on the movable support, and the movable support is arranged on the guide rail platform by taking the pressure head body as central symmetry. The three-point bending test fixture can adapt to rock three-point bending tests of various sizes by replacing the compression roller and the support roller, and meets the requirement of performing the three-point bending test on each group of test pieces with large size change on one fixture.
Description
Technical Field
The utility model relates to a geotechnical engineering detection area especially relates to a rock three point bending anchor clamps for size effect test.
Background
With the rapid development of economic construction in China, the scale of geotechnical engineering is gradually increased, and the problems of rock stability and deformation are increasingly prominent. The tensile strength is one of the most important mechanical characteristics of the rock and sometimes plays a decisive role in the stability of engineering, the overall instability damage of a plurality of geotechnical engineering is originated from local tensile fracture, and in actual engineering, the rock often has a tensile bending stress state similar to that of a beam and a plate. Meanwhile, from the viewpoint of fracture mechanics, cracking of geotechnical engineering structures is mainly caused by insufficient fracture toughness. Therefore, the research on the bending tensile strength and the fracture toughness of the rock has a far-reaching significance for the design and the stability evaluation of geotechnical engineering.
The method for measuring the tensile strength of the rock is mainly divided into a direct tensile test and an indirect tensile test, the direct tensile test of the rock is difficult due to the fact that the tensile strength of the rock is small, and a plurality of indirect tensile tests such as a Brazilian split test method, a point load test method and a bending test method appear successively. At present, a three-point bending test with a prefabricated crack has the characteristics of small size, light weight, simplicity in operation and the like, and becomes one of the most common methods for testing the fracture toughness of rocks by domestic and foreign scholars. The tensile strength and the fracture toughness of the rock can be effectively tested through a rock three-point bending test with a prefabricated crack, however, the original clamp of a universal testing machine purchased in a laboratory is specific to a large-size test piece, and the sizes of a support roller and a pressing edge of the original clamp are too large, so that the test requirements of a small-size test piece cannot be met. Meanwhile, the sizes of the support roller and the pressing blade limit that the clamp can only be suitable for test pieces with single size or similar sizes, and the bending test of each group of test pieces with large size change cannot be simultaneously met. Therefore, in order to develop the research on the rock size effect based on the three-point bending test, it is necessary to develop and design a rock three-point bending fixture for the size effect test.
Disclosure of Invention
The utility model aims at providing a rock three point bending anchor clamps for size effect test to solve the problem that above-mentioned prior art exists, can adapt to the rock three point bending test of multiple size through changing compression roller and fulcrum roll, satisfied the three point bending test who carries out the great each group's test piece of dimensional change on a anchor clamps.
In order to achieve the above object, the utility model provides a following scheme:
a rock three-point bending clamp for a size effect test comprises a pressure head part and a supporting part arranged below the pressure head part, wherein the pressure head part comprises a pressure head body and a compression roller, and the compression roller is arranged at the bottom of the pressure head body; the supporting part comprises a supporting roller, a movable support, a base and a guide rail platform, wherein two ends of the guide rail platform are respectively provided with one movable support, the movable support passes through the base and is connected with the guide rail platform, the supporting roller is further arranged on the movable support, and the movable support is arranged on the guide rail platform by taking the pressure head body as central symmetry.
Preferably, the movable support comprises a supporting part and a fixing part, the supporting part and the fixing part are vertically and integrally arranged, a plurality of adjacent second V-shaped grooves are formed in the top of the supporting part, the groove widths of the adjacent second V-shaped grooves are sequentially reduced, vertical calibration lines corresponding to the second V-shaped grooves are arranged on the side faces of the supporting part, the support rollers are arranged in the second V-shaped grooves, springs are connected to two ends of each support roller, and the other ends of the springs are fixed on the supporting part through bolts;
preferably, the bottom of the fixing part is provided with a strip-shaped bulge, the fixing part is also provided with a bolt through hole, and the strip-shaped bulge is embedded in a guide rail groove of the guide rail platform and is detachably connected with the base through a bolt;
preferably, a T-shaped sliding groove is formed in a guide rail groove of the guide rail platform, the base is a T-shaped sliding block, the base is embedded in the T-shaped sliding groove, and the top end of the base is lower than the upper surface of the guide rail platform;
preferably, a graduated scale is arranged on the outer side of the guide rail platform along the guide rail groove direction, the calibration line is vertically arranged above the graduated scale, and the calibration line is used for recording the position of the movable support on the guide rail platform;
preferably, the bottom of the pressure head body is provided with a first V-shaped groove, the pressure roller is fixed in the first V-shaped groove through a spring, one end of the spring is connected with the end part of the pressure roller, and the other end of the spring is fixed on the pressure head body through a bolt;
preferably, the top of the pressure head body is also provided with a pressure sensor;
preferably, the top of supporting part has two adjacent second V type grooves, the channel width in the second V type groove in the outside is greater than the channel width in the second V type groove in the inboard, 2 diameter variation sizes can be placed in the second V type groove in the outside the branch roller.
The utility model discloses for prior art gain following technological effect:
1) the utility model discloses a rock three point bending anchor clamps for size effect test can satisfy that each group's test piece that dimensional change is great carries out three point bending test through dismantling change compression roller and supporting roller, the model of interchangeable roller.
2) The utility model discloses a rock three point bending anchor clamps for size effect test is because long-time the use leads to the device to take place ageing wear, when continuing to use and can cause great experimental error, it is necessary to change the roller, but pedestal body and pressure head body still can continue to use, can material saving like this, reduce cost.
3) The utility model discloses a branch roller and compression roller both ends that are used for the crooked anchor clamps of rock three point of size effect test are fixed on mobile support and pressure head body by tension spring, have guaranteed that branch roller and compression roller are relatively stable in loading process.
4) The utility model discloses a rock three point bending anchor clamps for size effect test is because the bearing steel that high strength, high rigidity and abrasion resistance are good is chooseed for use to the bearing roller, cooperates the frequent dismantlement of tension spring and bolt, and the dismouting that can prevent to bring after rustting is inconvenient.
5) The utility model discloses a remove support and guide rail platform that is used for the crooked anchor clamps of rock three point of size effect test are connected through inlaying the base in the guide rail groove, and the accessible adjusting bolt elasticity changes the connection status, can enough realize removing the location of support concrete position on the guide rail platform, and convenient adjustment removes the position of support at the guide rail platform again to make integrated device convenient to detach.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic structural diagram of a rock three-point bending fixture for dimensional effect testing;
FIG. 2 is a schematic structural view of a supporting part of a rock three-point bending fixture for dimensional effect testing;
FIG. 3 is a schematic diagram of a movable support structure of a rock three-point bending fixture for dimensional effect testing;
FIG. 4 is a schematic structural diagram of a guide rail platform of a rock three-point bending fixture for dimensional effect testing;
FIG. 5 is a schematic diagram of a head portion of a rock three-point bending fixture for dimensional effect testing;
FIG. 6 is a schematic diagram of a support roller structure of a rock three-point bending fixture for dimensional effect testing;
FIG. 7 is a schematic view of a base structure of a rock three-point bending fixture for dimensional effect testing;
the device comprises a pressure head part 1, a supporting part 2, a guide rail platform 3, a movable support 4, a bolt 5, a T-shaped sliding block 6, a T-shaped sliding groove 7, a graduated scale 8, a second V-shaped groove 9, a support roller 10, a supporting part 11, a fixing part 12, a strip-shaped bulge 13, a spring 14, a calibration line 15, a screw hole 16, a bolt through hole 17, a pressure head body 18, a pressure roller 19, a small support roller 20, a medium support roller 21 and a large support roller 22.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a rock three point bending anchor clamps for size effect test to solve the problem that above-mentioned prior art exists, can adapt to the rock three point bending test of multiple size through changing compression roller and fulcrum roll, satisfied and carried out the great each group's test piece of dimensional change and carry out three point bending test on a anchor clamps.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
The first embodiment is as follows:
as shown in fig. 1-7, this embodiment is a schematic description and further explanation of the embodiment of a three-point bending rock clamp for dimensional effect testing according to the present invention.
As shown in fig. 1, the present embodiment provides a rock three-point bending fixture for a dimensional effect test, which includes a pressure head portion 1 and a supporting portion 2 disposed below the pressure head portion 1, where the pressure head portion 1 includes a pressure head body 18 and a pressure roller 19, as shown in fig. 5, a screw hole 16 is formed in the center of the top of the pressure head body 18, and the screw hole 16 is internally threaded and matched with a screw rod of a tester sensor, so as to ensure that the pressure head can uniformly transmit load. The press head body 18 is made of high-strength 40Cr steel, and the press roll 19 is made of high-strength, high-hardness and high-wear-resistant bearing steel. The compression roller 19 is provided with three sizes and is respectively placed in a first V-shaped groove at the bottom of the compression head body 18 in the experiment process, and two ends of the compression roller 19 are connected and fixed in the first V-shaped groove at the bottom of the compression head body 18 through the spring 14 before the experiment. Furthermore, one end of the spring 14 is connected with the end of the pressure roller 19, the other end of the spring 14 is connected with the bolt 5 and detachably fixed in a screw hole 16 of the pressure roller body 18 through the bolt 5, and the screw hole 16 is formed in the side wall of the pressure roller body 18 vertically above the pressure roller 19, so that the relative stability of the pressure roller 19 in the loading process is ensured, and the pressure roller 19 and the pressure roller body 18 are convenient to detach and replace.
As shown in fig. 2 and 3, the supporting part 2 comprises a supporting roller 10, a movable support 4, a base and a guide rail platform 3, wherein the movable support 4 comprises a supporting part 11 and a fixing part 12, the supporting part 11 and the fixing part 12 are vertically and integrally arranged, and in order to increase the minimum range of the two movable supports 4, the supporting part 11 and the fixing part 12 are integrally arranged at the ends; two second V-shaped grooves 9 are formed in the supporting portion 11 of the movable support 4, the groove widths of the two second V-shaped grooves 9 are different, support rollers 10 of different sizes are selected according to test requirements and placed in the second V-shaped grooves 9 of corresponding sizes, and the two ends of each support roller 10 are connected and fixed in the second V-shaped grooves 9 of the supporting portion 11 through springs 14 during testing. Furthermore, one end of the spring 14 is connected with the support roller 10, the other end of the spring 14 is connected with the bolt 5 and is fixed in a screw hole 16 of the support part 11 through the bolt 5, and the screw hole 16 is formed in the side wall of the support part 11 vertically below the support roller 10, so that the support roller 10 is relatively stable in the loading process, and the support roller 10 and the movable support 4 are convenient to disassemble and replace.
Further, in order to obtain an accurate test span, two calibration lines 15 are arranged at the lower ends of the two second V-shaped grooves 9 of the movable support 4, and correspond to vertical extension lines of the bottoms of the two second V-shaped grooves 9 respectively, specifically, the first calibration line 15 is 2mm away from the inner side of the support part 11, and the second calibration line 15 is 6.5mm away from the inner side of the support part 11; the bottom end of a fixing part 12 of the movable support 4 is provided with a strip-shaped bulge 13, specifically, the width of the strip-shaped bulge 13 is 1mm smaller than the width of the upper part of a T-shaped chute 7 of the guide rail platform 3, so that the strip-shaped bulge 13 of the movable support 4 can be embedded into the upper part of the T-shaped chute 7, part of the movable support 4 is primarily matched with the guide rail platform 3, a bolt through hole 17 with the diameter of 11mm is arranged on the fixing part 12 and the strip-shaped bulge 13, according to the test requirement, a support roller 10 is provided with three types, the diameters of which are respectively 2mm, 5mm and 10mm, the structure of which is shown in figure 6, specifically, a small support roller 20 with the diameter of 2mm before the test is placed in a second V-shaped groove 9 with a smaller groove width, a medium support roller 21 with the diameter of 5mm and a large support roller 22 with the diameter of 10mm are respectively placed in the second V-shaped groove 9 with a larger groove width as required, specifically, the support rollers 10 with the three, specifically, the movable support 4 is made of high-strength 40Cr steel, and the support roller 10 is made of high-strength, high-hardness and high-wear-resistance bearing steel, so that the inconvenience in assembly and disassembly caused by rusting is avoided.
As shown in fig. 4, a graduated scale 8 with the precision of 0.5mm and the measuring range of 200mm is arranged on the outer side of the guide rail platform 3, and the positions of the two movable supports 4 can be determined according to the numerical values of the graduated scale 8 recorded by the calibration line 15 during each test, so that the operation of a tester is facilitated.
As shown in fig. 7, the movable support 4 is fixedly connected with the guide rail platform 3 through a base, wherein the base is a T-shaped slide block 6, the upper part of the base is provided with a screw hole 16, the width of the top of the T-shaped slide block 6 is the same as the width of the strip-shaped protrusion 13 and is matched with the T-shaped slide groove 7, in the assembling process, the bolt 5 passes through a bolt 5 bolt through hole 17 on the fixing part 12 of the movable support 4 and is fixed in the screw hole 16 of the T-shaped slide block 6, specifically, the width of the bottom of the T-shaped slide block 6 is 1mm smaller than the width of the bottom of the T-shaped slide groove 7, and the height of the lower part of the T-shaped slide block 6 is 1mm lower than the corresponding part of the T-. Can change two movable support 4 in the position of guide rail platform 3 through lag bolt 5, after the position adjustment, through the bolt 5 of screwing alright fix movable support 4, and then carry out follow-up experiment.
The working process of the rock three-point bending clamp for the size effect test of the embodiment comprises the following steps:
step 1: manufacture of rock test pieces
Before the experiment, a rock sample to be tested is mechanically processed by a drilling machine, a lathe and other grinding tools in a laboratory, and is processed into standard square test pieces with three sizes through the processes of drilling, cutting, rough grinding, accurate grinding and the like, wherein the sizes can be (length multiplied by width multiplied by height): three test pieces of different sizes, 10mm × 30mm × 5mm, 20mm × 30mm × 10mm, and 40mm × 30mm × 20mm, were prepared to have an initial crack 0.5 times as high at the lower part of the midpoint in the longitudinal direction of each test piece. The sample preparation standard is carried out according to relevant regulations of GB50266-2013 engineering rock mass test method standard, the surface of the test piece is machined by a grinding machine, the allowable tolerance of the flatness of the two end faces of the test piece is smaller than 0.5mm, the test piece with the allowable tolerance of the side length dimension smaller than +/-0.2 mm is finally machined, and the surface of the test piece is ensured to be smooth and flat.
Step 2: installing a rock test piece on an operating platform
First, taking a rock specimen having dimensions (length × width × height) of 10mm × 30mm × 5mm as an example, the distance between the movable supports 4 set according to the test is 0.75 times the length of the specimen, and the span between the two rollers 10 is set to 7.5 mm. Because the test piece is small in size, a small support roller 20 with the diameter of 2mm is placed in the second V-shaped groove 9 with the small groove width during the test, the small support roller is fixed on the movable support 4 through the spring 14 and the bolt 5, the press roller 19 with the diameter of 2mm is placed in the first V-shaped groove of the press head body 18, and the press roller 19 is fixed on the press head body 18 through the spring 14 and the bolt 5.
Then the whole supporting part 2 is placed on an operation platform of the testing machine in a centering way, and the pressure head body 18 is connected with a sensor of the testing machine; then, the positions of the two movable supports 4 are determined by the calibration line 15 corresponding to the second V-groove 9 and the span and the scale 8 on the T-shaped chute 7, and the T-shaped slider 6 and the movable support 4 are fixed in the T-shaped chute 7 by the bolt 5 on the guide rail platform 3 according to the determined positions of the movable supports 4.
Secondly, the test piece is symmetrically placed on two small-sized support rollers 20, the sensor and the pressure head part 1 are slowly lowered downwards, the distance between the pressure head part 1 and the middle of the test piece is kept to be 1-2mm, the direction of the pressure head body 18 is adjusted to enable the axis of the pressure roller 19 to be superposed with the center line of the test piece in the width direction, and then the pressure head part 1 is continuously lowered to enable the two to be slightly contacted.
Step 3, carrying out load test on the rock test piece
And (4) applying a load, recording data such as the load, the displacement and the like in the experimental process in real time by using the testing machine until the test piece is broken and damaged, and finishing the test.
When the test piece test with the size (length multiplied by width multiplied by height) of 20mm multiplied by 30mm multiplied by 10mm is continuously carried out, the small-sized support roller 20 and the press roller 19 with the diameter of 2mm are detached, and the medium-sized support roller 21 (the diameter is 5mm) and the press roller 19 with the diameter of 5mm are selected to be connected with the movable support 4 and the press head body 18; when a test piece test with the size (length, width and height) of 40mm, 30mm and 20mm is carried out, rollers with other models are disassembled, a large support roller 22 with the diameter of 10mm is selected, and a compression roller 19 with the diameter of 10mm is connected with the movable support 4 and the compression head body 18; and repeating step 2 according to the corresponding span.
The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (8)
1. A rock three-point bending fixture for dimensional effect testing is characterized in that: the pressing head comprises a pressing head part and a supporting part arranged below the pressing head part, wherein the pressing head part comprises a pressing head body and a pressing roller, and the pressing roller is arranged at the bottom of the pressing head body; the supporting part comprises a supporting roller, a movable support, a base and a guide rail platform, wherein two ends of the guide rail platform are respectively provided with one movable support, the movable support passes through the base and is connected with the guide rail platform, the supporting roller is further arranged on the movable support, and the movable support is arranged on the guide rail platform by taking the pressure head body as central symmetry.
2. The rock three-point bending fixture for dimensional effect testing of claim 1, wherein: the movable support comprises a supporting portion and a fixing portion, the supporting portion and the fixing portion are arranged in a vertical and integrated mode, a plurality of adjacent second V-shaped grooves are formed in the top of the supporting portion and are adjacent, the groove width of the second V-shaped grooves is gradually reduced, vertical calibration lines corresponding to the second V-shaped grooves are arranged on the side faces of the supporting portion, the supporting rollers are arranged in the second V-shaped grooves, springs are connected to the two ends of the supporting rollers, and the other ends of the springs are fixed to the supporting portion through bolts.
3. The rock three-point bending fixture for dimensional effect testing of claim 2, wherein: the bottom of fixed part is provided with the bar arch, still open the bolt through-hole on the fixed part, the bar arch is embedded in the guide rail inslot of guide rail platform and through the bolt with the base can be dismantled and be connected.
4. A rock three-point bending fixture for dimensional effect testing according to claim 1 or 3, wherein: the guide rail groove of guide rail platform is provided with T type spout, the base is T type slider, the base is embedded in the T type spout and the top is less than the upper surface of guide rail platform.
5. The rock three-point bending fixture for dimensional effect testing of claim 4, wherein: the outer side of the guide rail platform is provided with a graduated scale along the direction of the guide rail groove, a calibration line is vertically arranged above the graduated scale, and the calibration line is used for recording the position of the movable support on the guide rail platform.
6. A rock three-point bending fixture for dimensional effect testing according to claim 1 or 5, wherein: first V type groove has been seted up to pressure head body bottom, the compression roller passes through the spring to be fixed first V type inslot, spring one end with the end connection of compression roller, the other end of spring passes through the bolt fastening on the pressure head body.
7. The rock three-point bending fixture for dimensional effect testing of claim 6, wherein: and the top of the pressure head body is also provided with a pressure sensor.
8. The rock three-point bending fixture for dimensional effect testing of claim 2, wherein: the top of supporting part is opened has two adjacent second V type grooves, and the groove width in the second V type groove in the outside is greater than the groove width in the second V type groove in inboard, and 2 diameter variation sizes can be placed to the second V type groove in the outside the branch roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920442178.XU CN209841536U (en) | 2019-04-03 | 2019-04-03 | Rock three-point bending clamp for testing size effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920442178.XU CN209841536U (en) | 2019-04-03 | 2019-04-03 | Rock three-point bending clamp for testing size effect |
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| CN209841536U true CN209841536U (en) | 2019-12-24 |
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| CN201920442178.XU Active CN209841536U (en) | 2019-04-03 | 2019-04-03 | Rock three-point bending clamp for testing size effect |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109855957A (en) * | 2019-04-03 | 2019-06-07 | 四川大学 | A kind of rock three-point bending fixture for dimensional effect test |
| US20210124809A1 (en) * | 2019-10-29 | 2021-04-29 | Saudi Arabian Oil Company | Systems and Methods for Determining Mechanical Properties of Materials using SENB Testing |
| CN114371071A (en) * | 2021-12-31 | 2022-04-19 | 核工业西南物理研究院 | Dual-purpose test fixture for three-point bending and shearing of small sample |
| US12025589B2 (en) | 2021-12-06 | 2024-07-02 | Saudi Arabian Oil Company | Indentation method to measure multiple rock properties |
-
2019
- 2019-04-03 CN CN201920442178.XU patent/CN209841536U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109855957A (en) * | 2019-04-03 | 2019-06-07 | 四川大学 | A kind of rock three-point bending fixture for dimensional effect test |
| CN109855957B (en) * | 2019-04-03 | 2023-12-01 | 四川大学 | Rock three-point bending clamp for size effect test |
| US20210124809A1 (en) * | 2019-10-29 | 2021-04-29 | Saudi Arabian Oil Company | Systems and Methods for Determining Mechanical Properties of Materials using SENB Testing |
| US11669659B2 (en) * | 2019-10-29 | 2023-06-06 | Saudi Arabian Oil Company | Systems and methods for determining mechanical properties of materials using SENB testing |
| US12025589B2 (en) | 2021-12-06 | 2024-07-02 | Saudi Arabian Oil Company | Indentation method to measure multiple rock properties |
| CN114371071A (en) * | 2021-12-31 | 2022-04-19 | 核工业西南物理研究院 | Dual-purpose test fixture for three-point bending and shearing of small sample |
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