CN211347653U - Columnar rock sample sealing device suitable for true triaxial test - Google Patents
Columnar rock sample sealing device suitable for true triaxial test Download PDFInfo
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- CN211347653U CN211347653U CN201922442259.2U CN201922442259U CN211347653U CN 211347653 U CN211347653 U CN 211347653U CN 201922442259 U CN201922442259 U CN 201922442259U CN 211347653 U CN211347653 U CN 211347653U
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- pressure head
- rock sample
- annular boss
- compression nut
- thermal shrinkage
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Abstract
A columnar rock sample sealing device suitable for a true triaxial test comprises a columnar pressure head, a heat shrinkage sleeve and a compression nut; the cylindrical pressure head is provided with an annular boss, and the annular boss is provided with an external thread; the rock sample is clamped between the two cylindrical pressure heads; the compression nut is provided with an annular convex edge and is in threaded connection with the annular boss; the thermal shrinkage sleeve wraps the outer sides of the cylindrical pressure head and the rock sample, and the sleeve opening of the thermal shrinkage sleeve is tightly sealed and pressed between the axial end face of the annular boss and the annular convex edge. The sealing method comprises the following steps: placing the rock sample on a bottom pressure head, sleeving a thermal shrinkage sleeve, sleeving a compression nut through the thermal shrinkage sleeve, placing a top pressure head on the top end of the rock sample, enabling the top pressure head to be also positioned in the thermal shrinkage sleeve, heating the thermal shrinkage sleeve to enable the thermal shrinkage sleeve to shrink until the cylindrical pressure head and the rock sample are completely and tightly wrapped, cutting off the thermal shrinkage sleeve wrapping the circumferential boss external thread surface, screwing two compression nuts respectively and screwing the corresponding circumferential boss in a screwed mode until the sleeve opening of the thermal shrinkage sleeve is compressed and sealed.
Description
Technical Field
The utility model belongs to the technical field of true triaxial test, especially, relate to a rock sample sealing device suitable for true triaxial test.
Background
At present, when carrying out the true triaxial test of rock, the sealed effect of rock sample can't let scientific research personnel satisfy all the time, because need seal through the heat shrinkable sleeve between rock sample and the pressure head, and still need seal between heat shrinkable sleeve and the pressure head, in being used for avoiding hydraulic oil in the pressure chamber to pass through the gap entering rock sample between heat shrinkable sleeve and the pressure head, in case hydraulic oil gets into the rock sample, will make the physical properties of rock sample change, the test data that obtain this moment will be the distortion, consequently will lose practical application and worth.
At the present stage, the sealing of the heat shrinkable sleeve and the pressure head is mainly realized by adopting an electrical tape winding mode, but the sealing failure rate of the sealing mode is the highest, the sealing mode is mainly used in a true triaxial test with short time efficiency, and once the time is too long, the sealing failure rate is exponentially increased. Still another sealing mode that is more commonly used, is to utilize the ferrule to cramp the cuff of pyrocondensation cover on the pressure head, the ageing of this sealing mode can be slightly longer than electrician's sticky tape winding sealing mode, but also can only satisfy the true triaxial test of medium and short ageing, along with the continuous expansion of experimental subject, the true triaxial test that needs to carry out under the long-term effect is more and more received attention, individual long-term effect test can reach several months even for a long time, in so long time, the rock sample then need be in the hydraulic oil of superhigh pressure all the time, and not allow to appear sealed inefficacy, but adopt the sealing mode of ferrule to also can not satisfy sealed reliability requirement under the long-term effect.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides a column rock sample sealing device suitable for true triaxial test has effectively overcome the higher drawback of rock sample sealed inefficacy probability under the traditional sealing mode, has effectively improved the sealing reliability of rock sample.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a columnar rock sample sealing device suitable for a true triaxial test comprises a first columnar pressure head, a second columnar pressure head, a heat shrinkage sleeve, a first compression nut and a second compression nut; the first cylindrical pressure head and the second cylindrical pressure head are identical in structure and size, a first annular boss is arranged in the axial middle of the first cylindrical pressure head, a second annular boss is arranged in the axial middle of the second cylindrical pressure head, and external threads are arranged on the outer peripheral surfaces of the first annular boss and the second annular boss; the first cylindrical pressure head is positioned at the bottom end of the rock sample, and the second cylindrical pressure head is positioned at the top end of the rock sample; the first compression nut and the second compression nut are identical in structure and size, internal threads are arranged on the inner surfaces of the first compression nut and the second compression nut, the internal threads of the first compression nut are in threaded connection with the external threads of the first annular boss, and the internal threads of the second compression nut are in threaded connection with the external threads of the second annular boss; a first annular convex edge is arranged inwards at a cylinder opening on one side of the first compression nut, a second annular convex edge is arranged inwards at a cylinder opening on one side of the second compression nut, the inner diameters of the first annular convex edge and the second annular convex edge are the same, and the inner diameters of the first annular convex edge and the second annular convex edge are larger than the diameter of the rock sample and smaller than the outer diameters of the first annular boss and the second annular boss; the thermal shrinkage sleeve is coated on the outer surfaces of the first cylindrical pressure head, the rock sample and the second cylindrical pressure head, but the outer peripheral surfaces of the first annular boss and the second annular boss, which are provided with external threads, are not coated by the thermal shrinkage sleeve; the bottom end socket of the thermal shrinkage sleeve is tightly sealed and pressed between the axial end face of the first annular boss and the first annular convex edge, and the top end socket of the thermal shrinkage sleeve is tightly sealed and pressed between the axial end face of the second annular boss and the second annular convex edge.
The method for sealing the columnar rock sample suitable for the true triaxial test adopts the device for sealing the columnar rock sample suitable for the true triaxial test, and comprises the following steps of:
the method comprises the following steps: vertically placing a first cylindrical pressure head on a workbench;
step two: vertically placing a rock sample to the top end of the first cylindrical pressure head;
step three: sleeving the heat shrinkable sleeve on the outer sides of the rock sample and the first cylindrical pressure head in sequence;
step four: sleeving a first compression nut into the rock sample through a heat-shrinkable sleeve, wherein a first annular convex edge on the first compression nut faces upwards;
step five: sleeving a second compression nut into the rock sample through a heat-shrinkable sleeve, wherein a second annular convex edge on the second compression nut faces downwards;
step six: vertically placing the second cylindrical pressure head on the top end of the rock sample, and enabling the second cylindrical pressure head to be also positioned in the thermal shrinkage sleeve;
step seven: heating the heat shrinkable sleeve by using a heat shrinkable gun to shrink the heat shrinkable sleeve until the heat shrinkable sleeve tightly wraps the first cylindrical pressure head, the rock sample and the second cylindrical pressure head;
step eight: cutting off the heat shrinkable sleeves coated on the outer thread surfaces of the first annular boss and the second annular boss by using a cutter respectively to completely expose the outer threads of the first annular boss and the second annular boss;
step nine: screwing a first compression nut onto the first annular boss until a bottom end socket of the heat-shrinkable sleeve is tightly pressed between the axial side end face of the first annular boss and the first annular convex edge in a sealing manner;
step ten: and screwing a second compression nut onto the second annular boss until the top sleeve opening of the heat shrinkable sleeve is tightly pressed between the shaft side end face of the second annular boss and the second annular convex edge in a sealing manner, and finishing the sealing of the rock sample.
The utility model has the advantages that:
the utility model discloses a column rock sample sealing device suitable for true triaxial test has effectively overcome the higher drawback of rock sample sealed inefficacy probability under the traditional sealing method, has effectively improved the sealing reliability of rock sample, compares with traditional sealing method and has simplified operation process by a wide margin, and the test preparation time has effectively been saved in the sealed of accomplishing the rock sample that can high efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a columnar rock sample sealing device suitable for a true triaxial test according to the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
in the figure, 1-first cylindric pressure head, 2-second cylindric pressure head, 3-pyrocondensation cover, 4-first gland nut, 5-second gland nut, 6-first hoop boss, 7-second hoop boss, 8-rock sample, 9-first annular protruding edge, 10-second annular protruding edge.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, a columnar rock sample sealing device suitable for a true triaxial test comprises a first columnar pressure head 1, a second columnar pressure head 2, a heat shrinkable sleeve 3, a first compression nut 4 and a second compression nut 5; the first cylindrical pressure head 1 and the second cylindrical pressure head 2 are identical in structure and size, a first annular boss 6 is arranged in the axial middle of the first cylindrical pressure head 1, a second annular boss 7 is arranged in the axial middle of the second cylindrical pressure head 2, and external threads are arranged on the outer peripheral surfaces of the first annular boss 6 and the second annular boss 7; the first cylindrical pressure head 1 is positioned at the bottom end of the rock sample 8, and the second cylindrical pressure head 2 is positioned at the top end of the rock sample 8; the first compression nut 4 and the second compression nut 5 are identical in structure and size, internal threads are arranged on the inner surfaces of the first compression nut 4 and the second compression nut 5, the internal threads of the first compression nut 4 are in threaded connection with the external threads of the first annular boss 6, and the internal threads of the second compression nut 5 are in threaded connection with the external threads of the second annular boss 7; a first annular convex edge 9 is arranged inwards at the tube mouth on one side of the first compression nut 4, a second annular convex edge 10 is arranged inwards at the tube mouth on one side of the second compression nut 5, the inner diameters of the first annular convex edge 9 and the second annular convex edge 10 are the same, and the inner diameters of the first annular convex edge 9 and the second annular convex edge 10 are larger than the diameter of the rock sample 8 and smaller than the outer diameters of the first annular boss 6 and the second annular boss 7; the thermal shrinkage sleeve 3 is coated on the outer surfaces of the first cylindrical pressure head 1, the rock sample 8 and the second cylindrical pressure head 2, but the outer peripheral surfaces of the first annular boss 6 and the second annular boss 7 which are provided with external threads are not coated by the thermal shrinkage sleeve 3; the bottom end socket of the thermal shrinkage sleeve 3 is tightly sealed between the axial end surface of the first annular boss 6 and the first annular convex edge 9, and the top end socket of the thermal shrinkage sleeve 3 is tightly sealed between the axial end surface of the second annular boss 7 and the second annular convex edge 10.
The method for sealing the columnar rock sample suitable for the true triaxial test adopts the device for sealing the columnar rock sample suitable for the true triaxial test, and comprises the following steps of:
the method comprises the following steps: vertically placing a first cylindrical pressing head 1 on a workbench;
step two: vertically placing a rock sample 8 to the top end of the first cylindrical pressure head 1;
step three: sleeving the heat shrinkable sleeve 3 on the outer sides of the rock sample 8 and the first cylindrical pressure head 1 in sequence;
step four: sleeving a first compression nut 4 into a rock sample 8 through a heat-shrinkable sleeve 3, wherein a first annular convex edge 9 on the first compression nut 4 faces upwards;
step five: sleeving a second compression nut 5 into a rock sample 8 through a heat-shrinkable sleeve 3, wherein a second annular convex edge 10 on the second compression nut 5 faces downwards;
step six: vertically placing the second cylindrical pressure head 2 on the top end of the rock sample 8, and enabling the second cylindrical pressure head 2 to be also positioned in the heat shrinkable sleeve 3;
step seven: heating the heat shrinkable sleeve 3 by using a heat shrinkable gun to shrink the heat shrinkable sleeve 3 until the heat shrinkable sleeve 3 tightly wraps the first cylindrical pressing head 1, the rock sample 8 and the second cylindrical pressing head 2;
step eight: cutting off the heat shrinkable sleeves 3 coated on the external thread surfaces of the first annular boss 6 and the second annular boss 7 by using a cutter respectively to completely expose the external threads of the first annular boss 6 and the second annular boss 7;
step nine: screwing a first compression nut 4 onto the first annular boss 6 until the bottom end socket of the heat-shrinkable sleeve 3 is tightly sealed and compressed between the axial side end face of the first annular boss 6 and the first annular convex edge 9;
step ten: and screwing the second compression nut 5 onto the second annular boss 7 until the top end socket of the heat shrinkable sleeve 3 is tightly pressed between the axial side end face of the second annular boss 7 and the second annular convex edge 10, and finishing the sealing of the rock sample 8.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (1)
1. The utility model provides a columnar rock sample sealing device suitable for true triaxial test which characterized in that: the device comprises a first cylindrical pressure head, a second cylindrical pressure head, a heat shrinkable sleeve, a first compression nut and a second compression nut; the first cylindrical pressure head and the second cylindrical pressure head are identical in structure and size, a first annular boss is arranged in the axial middle of the first cylindrical pressure head, a second annular boss is arranged in the axial middle of the second cylindrical pressure head, and external threads are arranged on the outer peripheral surfaces of the first annular boss and the second annular boss; the first cylindrical pressure head is positioned at the bottom end of the rock sample, and the second cylindrical pressure head is positioned at the top end of the rock sample; the first compression nut and the second compression nut are identical in structure and size, internal threads are arranged on the inner surfaces of the first compression nut and the second compression nut, the internal threads of the first compression nut are in threaded connection with the external threads of the first annular boss, and the internal threads of the second compression nut are in threaded connection with the external threads of the second annular boss; a first annular convex edge is arranged inwards at a cylinder opening on one side of the first compression nut, a second annular convex edge is arranged inwards at a cylinder opening on one side of the second compression nut, the inner diameters of the first annular convex edge and the second annular convex edge are the same, and the inner diameters of the first annular convex edge and the second annular convex edge are larger than the diameter of the rock sample and smaller than the outer diameters of the first annular boss and the second annular boss; the thermal shrinkage sleeve is coated on the outer surfaces of the first cylindrical pressure head, the rock sample and the second cylindrical pressure head, but the outer peripheral surfaces of the first annular boss and the second annular boss, which are provided with external threads, are not coated by the thermal shrinkage sleeve; the bottom end socket of the thermal shrinkage sleeve is tightly sealed and pressed between the axial end face of the first annular boss and the first annular convex edge, and the top end socket of the thermal shrinkage sleeve is tightly sealed and pressed between the axial end face of the second annular boss and the second annular convex edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922442259.2U CN211347653U (en) | 2019-12-30 | 2019-12-30 | Columnar rock sample sealing device suitable for true triaxial test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922442259.2U CN211347653U (en) | 2019-12-30 | 2019-12-30 | Columnar rock sample sealing device suitable for true triaxial test |
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| CN211347653U true CN211347653U (en) | 2020-08-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790950A (en) * | 2021-09-17 | 2021-12-14 | 长春市镨策试验仪器有限责任公司 | Pressure-bearing device for simulating high-energy-storage rock mass excavation unloading test and sealing method |
-
2019
- 2019-12-30 CN CN201922442259.2U patent/CN211347653U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790950A (en) * | 2021-09-17 | 2021-12-14 | 长春市镨策试验仪器有限责任公司 | Pressure-bearing device for simulating high-energy-storage rock mass excavation unloading test and sealing method |
| US11650140B2 (en) | 2021-09-17 | 2023-05-16 | Changchun Puce Test Instrument Co., Ltd. | Pressure-bearing device and sealing method for simulating excavation unloading test of high-energy-storage rock mass |
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