CN113776948A - Test device and method for simulating buckling failure of uniformly distributed external pressure of lining pipe - Google Patents
Test device and method for simulating buckling failure of uniformly distributed external pressure of lining pipe Download PDFInfo
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- CN113776948A CN113776948A CN202110901382.5A CN202110901382A CN113776948A CN 113776948 A CN113776948 A CN 113776948A CN 202110901382 A CN202110901382 A CN 202110901382A CN 113776948 A CN113776948 A CN 113776948A
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- 238000012360 testing method Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
- 238000010998 test method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 2
- 230000002706 hydrostatic effect Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000006378 damage Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- 238000004364 calculation method Methods 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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Abstract
The invention provides a test device for simulating buckling failure caused by uniformly distributed external pressure of a lining pipe, which comprises: a liner tube; the steel sleeve is sleeved on the periphery of the lining pipe, and two ends of the steel sleeve are respectively connected with the outer wall of the lining pipe in a sealing manner, so that a sealed cavity is formed between the inner wall of the steel sleeve and the outer wall of the lining pipe; a pressurizing system for injecting water into the closed cavity; and the data acquisition system comprises a pressure sensor arranged in the closed cavity, a plurality of strain gauges and a plurality of mark blocks arranged on the inner wall of the lining pipe, a stay wire displacement sensor radially arranged in the lining pipe and a camera. The invention has the beneficial effects that: injecting water into the closed cavity to pressurize and simulate evenly distributed hydrostatic pressure, and more fit with the actual working condition of hydrostatic pressure caused by the fact that underground water enters the annular gap through the damaged original pipeline and is applied to the lining pipe; the influence of the end part constraint of the inner lining pipe on the buckling failure of the inner lining pipe can be eliminated, the deformation of the monitoring section is analyzed as a plane strain problem, and the operability and accuracy of the test are improved.
Description
Technical Field
The invention relates to the technical field of critical buckling pressure and buckling failure characteristic tests of a lining pipe, in particular to a test device and a test method for simulating buckling failure of uniformly distributed external pressure of the lining pipe.
Background
Urban buried pipelines are important components of urban infrastructure and are responsible for the transmission of urban water, electricity, gas and communication. Along with the rapid increase of buried pipelines in newly-built cities, more and more pipelines reach the service life, and the defects of pipeline cracking, leakage, deformation, collapse and the like occur, so that the normal operation of urban resident life is influenced, and the pipelines are in urgent need of repair. The trenchless lining repairing technology is widely applied to repairing urban buried pipelines due to the advantages of short construction period, small environmental influence, no influence on traffic and the like, and the principle is that a layer of new lining pipe is laid in the existing pipeline with semi-structural damage to form a pipe-in-pipe composite structure, and the lining pipe and the existing pipeline bear internal and external loads together. At present, when utilizing the inside lining to restore existing damaged pipeline, the interior bushing pipe that adopts is mostly the interior bushing pipe of flexibility, and its structural strength is lower relatively, easily takes place buckling deformation or even destruction under the effect of outside hydrostatic pressure. In order to ensure the stability of the composite structure after the liner is repaired, the critical buckling strength and the buckling failure rule of the flexible liner pipe need to be researched, and guidance is provided for the repair design of the liner pipe.
The existing inner lining pipe uniform distribution external pressure test device comprises a pressurizing device, a seal cavity, an existing pipeline, an inner lining pipe, a data monitoring and collecting device and the like, water is injected into the seal cavity between the inner lining pipe and the existing pipeline for pressurizing, the device is complex, the inner lining pipe is difficult to mount and dismount, the requirement on the sealing performance is high, the test failure is easily caused due to the leakage of the device, the influence of end part restraint on the buckling failure characteristic is not considered, the annular gap needing to be arranged is large, the design of the test device has disadvantages, and the improvement is needed.
Disclosure of Invention
In view of this, in order to solve the problems that the existing test device for uniformly distributing and externally pressing the inner lining pipe is difficult to mount and dismount the inner lining pipe, has high requirements on sealing performance, and is easy to cause test failure due to leakage of the device, the embodiment of the invention provides a test device and a test method for simulating buckling failure of uniformly distributing and externally pressing the inner lining pipe.
The embodiment of the invention provides a test device for simulating buckling failure caused by uniformly distributed external pressure of a lining pipe, which comprises:
a liner tube to be tested;
the steel sleeve is sleeved on the periphery of the lining pipe, and two ends of the steel sleeve are respectively in sealing connection with the outer wall of the lining pipe, so that a sealed cavity is formed between the inner wall of the steel sleeve and the outer wall of the lining pipe;
the pressurizing system is used for injecting water into the closed cavity;
and the data acquisition system comprises a pressure sensor arranged in the closed cavity, a plurality of strain gauges and a plurality of mark blocks arranged on the inner wall of the lining pipe, a stay wire displacement sensor radially arranged in the lining pipe, and a camera for shooting images of the mark blocks.
Furthermore, the two ends of the steel sleeve are respectively in sealing connection with the outer wall of the inner lining pipe through two sealing parts, the two ends of the steel sleeve are respectively provided with a flange plate extending outwards along the radial direction, each sealing part comprises a sealing rubber film, a flange cover plate and a fastening part, the flange cover plates are attached to the flange plates and connected through the fastening parts, one end of each sealing rubber film is sleeved with one end of the inner lining pipe and is in bonding sealing, and the other end of each sealing rubber film is folded upwards and extends into the flange cover plate and is clamped between the flange plates.
Furthermore, a plurality of monitoring sections arranged at intervals are arranged along the axial direction of the lining pipe, wherein each monitoring section is provided with a plurality of strain gauges, a plurality of mark blocks and at least two bracing wire displacement sensors arranged in a crossed manner.
Furthermore, all the strain gauges and all the mark blocks on each monitoring section are uniformly distributed around the inner wall of the lining pipe, and the two stay wire displacement sensors are arranged vertically and oppositely.
Furthermore, the pressurization system comprises a water supply pipeline connected into the closed cavity, and a pressure test pump and a pressure gauge are arranged on the water supply pipeline.
Further, the closed cavity is provided with an exhaust valve.
Further, the pulley block comprises a pulley trolley for bearing the steel sleeve.
Furthermore, the data acquisition system also comprises an NI data acquisition card connected with each strain gauge through a lead and a first computer connected with the NI data acquisition card.
Further, the data acquisition system further comprises a second computer connected with the camera, wherein the camera is a DIC binocular camera.
The technical scheme of the test device for simulating the buckling failure caused by the uniformly distributed external pressure of the lining pipe provided by the embodiment of the invention has the following beneficial effects: water is injected into a closed cavity formed by an annular gap between the inner liner pipe and the steel sleeve pipe to pressurize so as to simulate uniformly distributed hydrostatic pressure, and the actual working condition of the hydrostatic pressure caused by the fact that underground water enters the annular gap through a damaged original pipeline and is applied to the inner liner pipe is better fitted; the end part of the steel sleeve pipe is connected with the end part of the lining pipe in a sealing mode through the sealing rubber film, the influence of end part restraint on buckling failure of the lining pipe is eliminated, deformation of a monitoring section can be used as a plane strain problem to be analyzed, and the operability and accuracy of the test are improved.
Based on the test device for simulating the uniformly distributed external buckling failure of the lining pipe, the embodiment of the invention also provides a test method for simulating the uniformly distributed external buckling failure of the lining pipe, which comprises the following steps:
s1, filling water into the sealed cavity to discharge air in the sealed cavity, and then injecting water into the sealed cavity to pressurize through the pressurizing system;
in the water injection pressurization process of S2, the pressure applied to the outer wall of the lining pipe is monitored through the pressure sensor, the strain of the pipe wall of the lining pipe at the position of the strain gauge is monitored through the strain gauge, the position change of each mark block is recorded through a camera, so that the deformation of the lining pipe is calculated, and the radial deformation of the lining pipe is monitored through the stay wire displacement sensor.
The technical scheme of the test method for simulating the uniformly distributed external pressure buckling failure of the lining pipe provided by the embodiment of the invention has the same beneficial effects as the test device for simulating the uniformly distributed external pressure buckling failure of the lining pipe, and redundant description is not needed.
Drawings
FIG. 1 is a schematic diagram of a test apparatus for simulating buckling failure of an inner liner pipe under uniform external pressure;
FIG. 2 is a schematic view of the blind flange 16 of FIG. 1;
fig. 3 is a schematic view of a monitoring section.
In the figure: 1-lining pipe, 2-steel sleeve, 3-sealed cavity, 4-pressure sensor, 5-water supply pipeline, 6-pressure test pump, 7-pressure gauge, 8-water inlet valve, 9-exhaust valve, 10-strain gauge, 11-stay wire displacement sensor, 12-camera, 13-NI data acquisition card, 14-first computer, 15-second computer, 16-flange cover plate, 17-sealing rubber membrane, 18-fastener, 19-flange plate, 20-pulley vehicle and 21-mark block.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a test apparatus for simulating an equispaced external pressure buckling failure of a lining pipe, including a lining pipe 1 to be tested, a steel casing 2, a pressurizing system, and a data acquisition system.
The lining pipe 1 can be selected from various lining pipes actually used for repairing trenchless linings of urban underground pipelines, and the cross sections of the ports at the two ends of the lining pipe should be kept orderly.
The steel sleeve 2 is sleeved on the periphery of the lining pipe 1, the lining pipe 1 is arranged in an inner hole of the steel sleeve 2, and then two ends of the steel sleeve 2 are respectively connected with the outer wall of the lining pipe 1 in a sealing mode, so that a sealed cavity 3 is formed between the inner wall of the steel sleeve 2 and the outer wall of the lining pipe 1.
Referring to fig. 1 and 2, specifically, two ends of the steel sleeve 2 are respectively connected with the outer wall of the inner lining pipe 1 in a sealing manner through two sealing members, two ends of the steel sleeve 2 are respectively provided with a flange 19 extending outwards in the radial direction, and each sealing member includes a sealing rubber film 17, a flange cover plate 16 and a fastening member 18. The flange cover plate 16 and the flange plate 19 are matched in shape and size, the flange cover plate 16 is arranged on the outer side of the flange plate 19, and the flange cover plate 16 is attached to the flange plate 19 and is connected with the flange plate 19 through the fastening piece 18. One end of the sealing rubber film 17 is sleeved with one end of the lining pipe 1 and is bonded and sealed, and the other end of the sealing rubber film is turned upwards and extends into the space between the flange cover plate 16 and the flange plate 19 to be clamped. Compared with the direct fixation of the end part of the lining pipe, the influence of end part restraint on the buckling failure characteristic can be eliminated, and the deformation of the monitored section is analyzed as a plane strain problem.
Preferably, the sealing rubber film 17 is folded at the port of the lining pipe 1, the port of the lining pipe 1 is abutted against the inner side surface of the flange cover plate 16, and lubricating oil can be smeared at the contact position of the port of the lining pipe 1 and the flange cover plate 16 to reduce friction between the port of the lining pipe 1 and the flange cover plate.
The fastening members 18 are fastening bolts which simultaneously penetrate through the flange cover 16, the sealing rubber film 17 and the flange cover 19, so that the flange cover 16 and the flange plate 19 clamp the sealing rubber film 17, thereby realizing the sealing connection between the steel sleeve 2 and the lining pipe 1.
In addition, the inner wall and the outer wall of the steel sleeve 2 and the flange cover plate 16 can be coated with an anti-rust layer, so that the test equipment can be prevented from being rusted after meeting water, the service life of the test equipment is prolonged, and the difficulty and the cost of maintenance are reduced.
The pressurization system is used for right the inside water injection of airtight cavity 3, the pressurization system is including inserting airtight cavity 3's water supply line 5, be equipped with pressure testing pump 6 and manometer 7 on the water supply line 5. Through pressure testing pump 6 can be right inject pressure water into seal chamber 3, the simulation equipartition hydrostatic pressure. In addition, the closed cavity 3 is provided with an exhaust valve 9, and the exhaust valve 9 is used for exhausting air in the closed cavity 3 when the closed cavity 3 is filled with water. A water inlet valve 8 may be further provided on the water supply line 5 to control the opening and closing of the water supply line 5.
The data acquisition system is used for testing the performance data of the lining pipe 1 in the test process, and specifically comprises a pressure sensor 4 arranged in the closed cavity 3, a plurality of strain gauges 10 and a plurality of mark blocks 21 arranged on the inner wall of the lining pipe 1, a stay wire displacement sensor 11 arranged in the lining pipe 1 in the radial direction, and a camera 12 for shooting images of the mark blocks 21. The strain gauge 10 is used for monitoring the strain of the lining pipe 1 under the action of water pressure. The stay wire displacement sensor 11 is adopted to monitor the deformation displacement of the monitoring section of the lining pipe 1, and compared with a CCD (charge coupled device) industrial camera, the influence of the vertical floating of the lining pipe 1 in the steel sleeve 2 can be avoided, and the accuracy of the result is improved. The camera 12 monitors the deformation of the arrangement interface of the mark block 21 to further determine the strain of the lining pipe 1, and the whole buckling failure process of the lining pipe 1 can be dynamically displayed.
Referring to fig. 3, preferably, a plurality of monitoring sections are disposed at intervals along the axial direction of the lining tube 1, wherein each monitoring section is provided with a plurality of strain gauges 10, a plurality of marker blocks 21, and at least two cross-disposed stay wire displacement sensors 11. For each monitoring section, all the strain gauges 10 and all the mark blocks 21 on the monitoring section are uniformly distributed around the inner wall of the lining pipe 1, one strain gauge 10 is arranged near each mark block 21, and the two stay wire displacement sensors 11 are arranged vertically relatively.
In order to facilitate data acquisition and calculation, the data acquisition system further comprises an NI data acquisition card 13 connected with each strain gauge through a wire, and a first computer 14 connected with the NI data acquisition card 13. Further, the data acquisition system further comprises a second computer 15 connected with the camera 12 through a wire, the camera 12 is preferably a DIC binocular camera, clearer and more accurate images of the mark blocks 21 can be obtained, and the deformation of the lining pipe 1 calculated through the position change of the mark blocks 21 is more accurate and persuasive.
In addition, the test device for simulating the uniform distribution and external compression buckling failure of the inner bushing pipe further comprises a trolley 20 for bearing the steel bushing pipe 2, and the steel bushing pipe 2 is fixed on the trolley 20, so that the steel bushing pipe 2 can move conveniently. And other components except the steel sleeve 2 can be independently assembled and disassembled, so that the test device is convenient to store and maintain.
Referring to fig. 1, based on the above test apparatus for simulating the uniformly distributed external pressure buckling failure of the inner liner tube, an embodiment of the present invention further provides a test method for simulating the uniformly distributed external pressure buckling failure of the inner liner tube, including the following steps:
s1, discharging the air in the sealed cavity 3, and injecting water into the sealed cavity 3 through the pressurization system. Specifically, the exhaust valve 9 is opened, and the closed cavity 3 is filled with water to exhaust air therein; then closing the exhaust valve, starting the pressure test pump 6 to slowly and uniformly inject water into the sealed cavity 3 for pressurization;
in the water injection pressurization process of S2, the pressure applied to the outer wall of the lining pipe 1 is monitored through the pressure sensor 4, the strain of the pipe wall of the lining pipe 1 at the position of the strain gauge 10 is monitored through the strain gauge, the position change of each mark block 21 is recorded through the camera 12, the deformation size of the lining pipe 1 is calculated, and the radial deformation size of the lining pipe 1 is monitored through the stay wire displacement sensor 11.
And when the pressure in the closed cavity 3 reaches a preset test limit load or the liner pipe 1 is subjected to buckling failure damage, closing the pressure test pump 6 and finishing the test.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a test device that bushing pipe equipartition external pressure buckling failure in simulation, its characterized in that includes:
a liner tube to be tested;
the steel sleeve is sleeved on the periphery of the lining pipe, and two ends of the steel sleeve are respectively in sealing connection with the outer wall of the lining pipe, so that a sealed cavity is formed between the inner wall of the steel sleeve and the outer wall of the lining pipe;
the pressurizing system is used for injecting water into the closed cavity;
and the data acquisition system comprises a pressure sensor arranged in the closed cavity, a plurality of strain gauges and a plurality of mark blocks arranged on the inner wall of the lining pipe, a stay wire displacement sensor radially arranged in the lining pipe, and a camera for shooting images of the mark blocks.
2. The test device for simulating the uniformly distributed external pressure buckling failure of the lining pipe according to claim 1, wherein the test device comprises: the sealing device comprises a steel sleeve, a lining pipe, a sealing rubber film, a flange cover plate and a fastener, wherein the two ends of the steel sleeve are respectively in sealing connection with the outer wall of the lining pipe through two sealing parts, the two ends of the steel sleeve are respectively provided with a flange plate extending outwards along the radial direction, the sealing parts comprise the sealing rubber film, the flange cover plate and the fastener, the flange cover plate is attached to and connected with the flange plate through the fastener, one end of the sealing rubber film is sleeved with one end of the lining pipe and is bonded and sealed, and the other end of the sealing rubber film is folded upwards and extends into the flange cover plate and is clamped between the flange plates.
3. The test device for simulating the uniformly distributed external pressure buckling failure of the lining pipe according to claim 1, wherein the test device comprises: and a plurality of monitoring sections arranged at intervals are arranged along the axial direction of the lining pipe, wherein each monitoring section is provided with a plurality of strain gauges, a plurality of mark blocks and at least two stay wire displacement sensors arranged in a crossed manner.
4. The test device for simulating the uniformly distributed external pressure buckling failure of the lining pipe as claimed in claim 3, wherein: all the strain gauges and all the mark blocks on each monitoring section are uniformly distributed around the inner wall of the lining pipe, and the two stay wire displacement sensors are arranged vertically and oppositely.
5. The test device for simulating the uniformly distributed external pressure buckling failure of the lining pipe according to claim 1, wherein the test device comprises: the pressurizing system comprises a water supply pipeline connected into the closed cavity, and a pressure test pump and a pressure gauge are arranged on the water supply pipeline.
6. The test device for simulating the uniformly distributed external pressure buckling failure of the lining pipe according to claim 1, wherein the test device comprises: the closed cavity is provided with an exhaust valve.
7. The test device for simulating the uniformly distributed external pressure buckling failure of the lining pipe according to claim 1, wherein the test device comprises: the pulley block is used for bearing the steel sleeve.
8. The test device for simulating the uniformly distributed external pressure buckling failure of the lining pipe according to claim 1, wherein the test device comprises: the data acquisition system also comprises an NI data acquisition card and a first computer, wherein the NI data acquisition card is respectively connected with each strain gauge through a lead, and the first computer is connected with the NI data acquisition card.
9. The test device for simulating the uniformly distributed external pressure buckling failure of the lining pipe according to claim 1, wherein the test device comprises: the data acquisition system further comprises a second computer connected with the camera, wherein the camera is a DIC binocular camera.
10. A test method for simulating the buckling failure caused by the uniformly distributed external pressure of a lining pipe is characterized by comprising the following steps: the test device for simulating the equispaced external pressure buckling failure of the lining pipe as claimed in any one of claims 1 to 9 is used, and comprises the following steps:
s1, filling water into the sealed cavity to discharge air in the sealed cavity, and then injecting water into the sealed cavity to pressurize through the pressurizing system;
in the water injection pressurization process of S2, the pressure applied to the outer wall of the lining pipe is monitored through the pressure sensor, the strain of the pipe wall of the lining pipe at the position of the strain gauge is monitored through the strain gauge, the position change of each mark block is recorded through a camera, so that the deformation of the lining pipe is calculated, and the radial deformation of the lining pipe is monitored through the stay wire displacement sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110901382.5A CN113776948A (en) | 2021-08-06 | 2021-08-06 | Test device and method for simulating buckling failure of uniformly distributed external pressure of lining pipe |
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| CN202110901382.5A CN113776948A (en) | 2021-08-06 | 2021-08-06 | Test device and method for simulating buckling failure of uniformly distributed external pressure of lining pipe |
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| CN114295486A (en) * | 2021-12-22 | 2022-04-08 | 中国长江三峡集团有限公司 | Flexible liner external pressure buckling test device and method |
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| CN114295486A (en) * | 2021-12-22 | 2022-04-08 | 中国长江三峡集团有限公司 | Flexible liner external pressure buckling test device and method |
| CN116148033A (en) * | 2022-11-10 | 2023-05-23 | 中国原子能科学研究院 | Test device and test method |
| CN116148033B (en) * | 2022-11-10 | 2024-05-14 | 中国原子能科学研究院 | Test device and test method |
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Application publication date: 20211210 |