CN204154664U - Soil sample freezing-thawing test device - Google Patents
Soil sample freezing-thawing test device Download PDFInfo
- Publication number
- CN204154664U CN204154664U CN201420594406.2U CN201420594406U CN204154664U CN 204154664 U CN204154664 U CN 204154664U CN 201420594406 U CN201420594406 U CN 201420594406U CN 204154664 U CN204154664 U CN 204154664U
- Authority
- CN
- China
- Prior art keywords
- cryostat
- soil sample
- temperature control
- control plate
- model casing
- 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
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model relates to a kind of soil sample freezing-thawing test device, comprises model bearing system, temperature-controlling system, water charging system, atmospheric environment simulation system and data acquisition system (DAS) five part.By the temperature of upper and lower temperature control plate in cryostat respectively Controlling model case, casing top arranges fan and rotatable sprinkler tip, realizes the simulation to atmospheric precipitation and field wind.Bottom half is provided with water charging system, the sensor such as soil sample test section set temperature, volume unfrozen water content, soil water potential, thermoflux, distortion, Validity Test is carried out to the physical mechanics key element such as temperature, volume unfrozen water content, soil water potential, thermoflux, deflection of the soil sample in frozen-thaw process, substantially increases measurable precision and scope.Overcome the shortcoming and defect of the scale effect that existing freezing-thawing test system causes because of small size.The utility model structure is simple, be easy to operation, measure accurately, requires low, working stability to working environment.
Description
Technical field
The utility model relates to a kind of experiment test device, specifically refers to a kind of soil sample freezing-thawing test device.Effectively can measure the situation of change of the physical mechanics key elements such as the temperature under open and sealing condition in soil body frozen-thaw process, volume unfrozen water content, soil water potential, thermoflux and distortion, for the hydro-thermal change procedure of the research soil body in frozen-thaw process and freeze thawing deformation rule provide effective approach.
Background technology
Freezing-thawing test is carried out thermal exchange simulation to the sample of specifying by artificial cooling and the technology that heats and measured the process of its physical chemistry and mechanical property.Freezing-thawing test technology is in material science, cold regions engineering and medicine and other fields extensive application, and the physico-mechanical properties of such as concrete material permanance, soil body frozen-thaw process is studied, new all many-sides such as Key works Drug packing and storage stability.
Freezing-thawing test is the Main Means of research soil body water-Re-force characteristic change in frozen-thaw process.The test of current domestic frost heave, thaw collapse is general adopts cylindric sample, diameter has 6.18cm ~ 20cm not, corresponding height is (Xu Xiangtian between 10cm ~ 20cm, Lai Yuanming, Liu Feng, Chang little Xiao, Dong Yuanhong. the discussion [J] of a few class mechanical test method in frozen soil. dirt band, 2011,33 (5): 1132-1138, Yuanming Lai, Wansheng Pei, Mingyi Zhang, Jiazuo Zhou. Study on theory model of hydro-thermal – mechanical interaction process in saturated freezing silty soil [J]. International Journal of Heat and Mass Transfer, 2014, 78:805 – 819), be placed on and be equipped with in the organic glass bucket of temperature sensor, and be together placed in constant temperature oven, temperature control is carried out to sample top and bottom, the temperature variation of sample inside and external overall distortion are monitored, the feature of these test models is that soil sample size is little, be easy to operation, thermograde can only be studied, external load, the Macroscopic Factors such as initial water content and soil body type are on the impact of soil body freeze thawing feature, the change procedure of soil body interior microscopic key element in frozen-thaw process cannot be monitored, as: volume unfrozen water content, the dynamic change of soil water potential etc., what the physical condition in field faced in addition is the features such as water translocation route is long, thermo parameters method scope is wide, frost heave growing space is large.Therefore, model test so at present because soil sample size is little, test unit function is limited, and is easily subject to the interference of environment, there is very large difficulty to the Measurement accuracy of inner water translocation, temperature variation and deflection.
In the face of small sample measures key element single (temperature of sample inside and external overall distortion), measure the problems such as difficulty is large, in order to consider many factors affecting freezing-thawing test effect, simulate field environment condition more truly, give full play to shop experiment cost low, the advantage that efficiency is high, to many key elements (temperature of sample inside, volume unfrozen water content, soil water potential change and dimensional deformation etc.) carry out Validity Test, effective soil sample freezing-thawing test new device reasonable in design, the Validity Test completing the physico-mechanical properties of soil body sample in frozen-thaw process is necessary.
Summary of the invention
For simulating the field virtual condition of frozen soil more truly, the purpose of this utility model aims to provide a kind of soil sample freezing-thawing test device, can monitor the change of soil body interior microscopic key element in frozen-thaw process.
The technical scheme that the utility model adopts is:
A kind of soil sample freezing-thawing test device, is tested conduit, aqueduct, aqueduct interface, hardboard, moisturizing groove, fan, rotatable sprinkler tip, fixed frame, data collecting instrument and computing machine formed by model casing, castor, smooth heat-insulating shield, sensor lead mouth, the import and export of cryostat fluid catheter, soil sample platform, lower temperature control plate, upper temperature control plate, fixed cross beam, sidewall pillar, top cover, fastener, cryostat liquid interface, catheter, 1# cryostat, 2# cryostat, cryostat liquid, displacement transducer, other sensors, water level controller, water level.Model casing and top cover form one by fastener and close entirety, and bottom is equipped with castor.Model casing body sidewall is made up of stainless steel clamp insulation material, inwall is covered with smooth heat-insulating shield, the each sidewall corner of model casing establishes sidewall pillar, for supporting and fixing above temperature control plate and lower temperature control plate, fixed cross beam and hardboard is sequentially equipped with below upper temperature control plate, fixed cross beam and fixed frame) be fixed on model casing inwall, fan and rotatable sprinkler tip fixed frame be equipped with; Lower temperature control plate is positioned at the bottom of model casing, and its top arranges moisturizing groove, and moisturizing groove being laid water permeable membrane is soil sample platform, and soil sample occupy between hardboard and soil sample platform; Displacement transducer bottom is stable on fixed cross beam, its head probe is contacted with soil sample end face by hardboard, other sensors are embedded in the section of test soil sample by two sensor lead mouths that model casing left and right sides wall is provided with, its lead-in wire is connected with data collecting instrument, and data collecting instrument is connected with computing machine again; The external water level controller of model casing is connected by the aqueduct interface of aqueduct with moisturizing groove both sides with water level test conduit, and it is corresponding with the cryostat liquid interface of upper temperature control plate, lower temperature control plate that model casing front side wall upper and lower part establishes cryostat fluid catheter to import and export; Fill cryostat liquid respectively in 1# cryostat and 2# cryostat, 2# cryostat is by catheter and cryostat liquid interface is connected with upper temperature control plate, catheter is passed through in 1# cryostat and cryostat liquid interface is connected with lower temperature control plate.
Other above-mentioned sensor is temperature sensor, volume unfrozen water content sensor, soil water potential sensor, heat flux sensor and deformation-sensor.
The beneficial effect of advantage of the present utility model and generation is:
1, the utility model adopts large volume, large-sized model casing, in casing can the measuring point of placement sensor many, effectively overcome existing model test due to the deficiency that soil sample size is little, pilot system function is limited.By the temperature by upper and lower temperature control plate in cryostat respectively Controlling model case, casing top arranges fan and rotatable sprinkler tip, make upper and lower two independent cryostats and water charging system realize synchronously carrying out of freezing-thawing test temperature control and moisturizing, and utilize the multiple sensors in large scale soil sample to carry out Validity Test to the temperature of sample inside, volume unfrozen water content, soil water potential, thermoflux and specimen deformation etc.Thus achieve measurement while multiple physical and mechanical parameter in soil sample frozen-thaw process, achieve the simulation of rural atmosphere apoplexy and rainfall, for test in large scale soil sample chamber opens a new way.
2, the utility model had both realized the freezing-thawing test of open environment by bottom water charging system, the freezing-thawing test of enclosed environment is realized again by closing water charging system, and water replenishment amount can be regulated by automatic water feeding controller, simulate multiple test condition, realize the effective simulation to seasonal frozen ground; Also being subzero temperature by arranging lower temperature control plate, closing water charging system, by arranging artificial ice sheet to reach the object of simulation ever frost in the soil layer of bottom.
3, the utility model can according to different industries codes and standards design experiment frozen-thaw process, and variation freely increases and decreases testing element (as various kinds of sensors etc.), and compatible good, secondary development degree is high, can realize differentiation test design.
4, the utility model structure simple, be easy to operation, working stability low to working environment requirement, realize integrated management to whole test unit and control by computing machine simultaneously.There is the advantages such as test function is strong, testing factor is many, data test is accurate, be easy to operate and control.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Fig. 2 is the vertical view of model casing.
Fig. 3 is the side view of model casing.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further again:
As shown in Fig. 1 ~ 3, soil sample freezing-thawing test device, by smeared model case 1, castor 2, smooth heat-insulating shield 3, sensor lead mouth 4, cryostat fluid catheter imports and exports 5, soil sample platform 6, lower temperature control plate 7, upper temperature control plate 8, fixed cross beam 9, sidewall pillar 10, top cover 11, fastener 12, cryostat liquid interface 13, catheter 14, 1# cryostat 15, 2# cryostat 16, cryostat liquid 17, displacement transducer 18, other sensors 19, water level controller 20, water level test conduit 21, aqueduct 22, aqueduct interface 23, hardboard 24, moisturizing groove 25, fan 26, rotatable sprinkler tip 27, fixed frame 28, data collecting instrument 29 and computing machine 30 form.Model casing 1 and top cover 11 form one by fastener 12 and close overall (can be rectangular parallelepiped or right cylinder), establish 360 degree of movable castors 2 bottom it.Model casing 1 sidewall is made up of stainless steel clamp PVC insulation material, insulation material thickness is not less than 0.1m, inwall is covered with smooth heat-insulating shield 3, the each sidewall corner of model casing 1 establishes sidewall pillar 10, for supporting and fixing above temperature control plate 8 and lower temperature control plate 7, fixed cross beam 9 and hardboard (24) is sequentially equipped with below upper temperature control plate 8, fixed cross beam 9 and fixed frame 28 are fixed on model casing inwall, fan 26 and rotatable sprinkler tip 27 fixed frame 28 be equipped with, lower temperature control plate 7 is positioned at the bottom of model casing 1, its top arranges moisturizing groove 25, moisturizing groove 25 being laid water permeable membrane is soil sample platform 6, ensure that stability and the bottom moisturizing of soil sample are unimpeded, soil sample occupy between hardboard 24 and soil sample platform 6, displacement transducer 18 bottom is stable on fixed cross beam 9, and its head probe is contacted with soil sample end face by hardboard 24, and other sensors 19 comprise temperature sensor, volume unfrozen water content sensor, soil water potential sensor, heat flux sensor.Two the sensor lead mouths 4 be provided with by model casing 1 left and right sides wall are embedded in the section of test soil sample with being evenly distributed, its lead-in wire is connected with data collecting instrument 29 with power supply respectively through sensor lead mouth 4, data collecting instrument is connected with computing machine 30 again, realizes temperature, volume unfrozen water content, soil water potential, thermoflux data acquisition.Water level controller 20 outside model casing 1 is connected with the aqueduct interface 23 of moisturizing groove both sides by aqueduct 22 with water level test conduit 21, realizes water lev el control and test.Model casing 1 front side wall upper and lower part establishes cryostat fluid catheter to import and export 5, corresponding with the cryostat liquid interface 13 of upper temperature control plate 8, lower temperature control plate 7.
In implementation process, first bottom model casing 1, arrange lower temperature control plate 7, upwards lay moisturizing groove 25 and soil sample platform 6 successively.And then be start to fill sample on soil sample platform 6, dress sample process is carried out according to the mode of the layering densification of current code requirement.Soil sample can be the combination of one or more of different soil property, different-grain diameter, different moisture content, and arranges displacement transducer 18 at soil sample end face by fixed cross beam 9 and hardboard 24, evenly buries other sensor 19 underground at test soil sample section simultaneously, connects good lead-in wire.Then the fixed frame 28 that fan 26 and rotatable sprinkler tip 27 are housed is arranged, again by place for upper temperature control plate 8, and seal gap around with water-proof heat-insulation material, cryostat fluid catheter import and export 5 and sensor lead mouth 4 are also carried out thermal-insulating sealing simultaneously, finally closing model casing top cover 11 and buckleing with fastener 12 extremely makes model casing 1 be formed as a closed entirety, at utmost realize heat insulation effect, reduce ambient temperature to the influence degree of process of the test.Cryostat liquid 17 is filled respectively in 1# cryostat 15 and 2# cryostat 16,1# cryostat 15 is connected with lower temperature control plate 7 by catheter 14 and cryostat liquid interface 13,2# cryostat 16 is connected with upper temperature control plate 8 by catheter 14 and cryostat liquid interface 13, achieve and cryostat liquid is injected the effect that upper and lower temperature control plate carries out temperature control, cryostat liquid can be the subzero liquid such as alcohol or kerosene.Catheter outer wall arranges PVC insulation material, carry out heat-insulation and heat-preservation, insulation material thickness >=5 cm, coefficient of heat conductivity≤0.025 W/(m26 simulates field wind and opens rotatable sprinkler tip 27 simulated rainfall process, and test soil sample moisture increment can be regulated by automatic water feeding controller 20, realize water level adjustment process by water level test conduit 21 visual.Various kinds of sensors be connected with data collecting instrument 29 after on-test, data collecting instrument 29 is connected with computing machine 30, can realize datamation collection after setting frequency acquisition, achieves integrated management and control by computing machine to whole test unit.
Claims (2)
1. soil sample freezing-thawing test device is by model casing (1), castor (2), smooth heat-insulating shield (3), sensor lead mouth (4), cryostat fluid catheter imports and exports (5), soil sample platform (6), lower temperature control plate (7), upper temperature control plate (8), fixed cross beam (9), sidewall pillar (10), top cover (11), fastener (12), cryostat liquid interface (13), catheter (14), 1# cryostat (15), 2# cryostat (16), cryostat liquid (17), displacement transducer (18), other sensors (19), water level controller (20), water level test conduit (21), aqueduct (22), aqueduct interface (23), hardboard (24), moisturizing groove (25), fan (26), rotatable sprinkler tip (27), fixed frame (28), data collecting instrument (29) and computing machine (30) composition, model casing (1) and top cover (11) form one by fastener (12) and close entirety, bottom is equipped with castor (2), it is characterized in that model casing (1) sidewall is made up of stainless steel clamp insulation material, inwall is covered with smooth heat-insulating shield (3), model casing (1) each sidewall corner establishes sidewall pillar (10), for supporting and fixing above temperature control plate (8) and lower temperature control plate (7), upper temperature control plate (8) below is sequentially equipped with fixed cross beam (9) and hardboard (24), fixed cross beam (9) and fixed frame (28) are fixed on model casing inwall, fixed frame (28) are equipped with fan (26) and rotatable sprinkler tip (27), lower temperature control plate (7) is positioned at the bottom of model casing (1), and its top arranges moisturizing groove (25), and moisturizing groove (25) upper laying water permeable membrane is soil sample platform (6), and soil sample occupy between hardboard (24) and soil sample platform (6), displacement transducer (18) bottom is stable on fixed cross beam (9), its head probe is contacted with soil sample end face by hardboard (24), other sensors (19) are embedded in the section of test soil sample by two sensor lead mouths (4) that model casing (1) left and right sides wall is provided with, its lead-in wire is connected with data collecting instrument (29), and data collecting instrument is connected with computing machine (30) again, model casing (1) water level controller outward (20) is connected with the aqueduct interface (23) of moisturizing groove (25) both sides by aqueduct (22) with water level test conduit (21), and it is corresponding with the cryostat liquid interface (13) of upper temperature control plate (8), lower temperature control plate (7) that model casing (1) front side wall upper and lower part establishes cryostat fluid catheter to import and export (5), cryostat liquid (17) is filled respectively in 1# cryostat (15) and 2# cryostat (16), 2# cryostat (16), by catheter (14) and cryostat liquid interface (13) and upper temperature control plate (8), connects, 1# cryostat (15) is connected with lower temperature control plate (7) by catheter (14) and cryostat liquid interface (13).
2. soil sample freezing-thawing test device according to claim 1, is characterized in that above-mentioned other sensor (19) is temperature sensor, volume unfrozen water content sensor, soil water potential sensor, heat flux sensor and strain transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420594406.2U CN204154664U (en) | 2014-10-15 | 2014-10-15 | Soil sample freezing-thawing test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420594406.2U CN204154664U (en) | 2014-10-15 | 2014-10-15 | Soil sample freezing-thawing test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204154664U true CN204154664U (en) | 2015-02-11 |
Family
ID=52512768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420594406.2U Expired - Fee Related CN204154664U (en) | 2014-10-15 | 2014-10-15 | Soil sample freezing-thawing test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204154664U (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267172A (en) * | 2014-09-30 | 2015-01-07 | 中国科学院寒区旱区环境与工程研究所 | Multifunctional integrated type soil body freezing and thawing test system |
| CN104730100A (en) * | 2015-03-05 | 2015-06-24 | 中国科学院寒区旱区环境与工程研究所 | Device for testing hydrothermal variation features of hydrous porous medium in freeze thawing process |
| CN104807975A (en) * | 2015-04-28 | 2015-07-29 | 西南石油大学 | Talus slope freezing and thawing circulating action deformation physical model experiment apparatus and experimental method |
| CN105334240A (en) * | 2015-11-11 | 2016-02-17 | 中国科学院武汉岩土力学研究所 | Rock fracture frost heaving deformation testing device |
| CN105628512A (en) * | 2016-03-23 | 2016-06-01 | 四川大学 | Test box and system capable of simulating mechanical property of test piece under freeze-thaw temperature load |
| CN105973746A (en) * | 2016-01-25 | 2016-09-28 | 天津城建大学 | Apparatus for testing unfrozen water content of frozen soil, and method thereof |
| CN106501489A (en) * | 2016-12-09 | 2017-03-15 | 长安大学 | Coarse Saline salt is swollen and molten sunken multifunction test device |
| CN107907227A (en) * | 2017-11-10 | 2018-04-13 | 敦煌研究院 | A kind of earthen ruins surface and the measuring method of internal temperature change |
| CN108614089A (en) * | 2018-05-09 | 2018-10-02 | 重庆交通大学 | Compacted fill freeze thawing and weathering environmental simulation system and its test method |
| CN110108861A (en) * | 2019-05-30 | 2019-08-09 | 西北农林科技大学 | A kind of auxiliary hot pin indoor model test device of research canal base day heat |
| CN113447639A (en) * | 2021-06-24 | 2021-09-28 | 中山大学 | Frozen soil freeze-thaw cycle process simulation device |
| CN113671151A (en) * | 2021-07-27 | 2021-11-19 | 西安科技大学 | Indoor model test system for icing evolution process of tillite |
-
2014
- 2014-10-15 CN CN201420594406.2U patent/CN204154664U/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267172B (en) * | 2014-09-30 | 2015-12-02 | 中国科学院寒区旱区环境与工程研究所 | A kind of multifunctional all formula soil body freezing-thawing test system |
| CN104267172A (en) * | 2014-09-30 | 2015-01-07 | 中国科学院寒区旱区环境与工程研究所 | Multifunctional integrated type soil body freezing and thawing test system |
| CN104730100B (en) * | 2015-03-05 | 2017-08-11 | 中国科学院寒区旱区环境与工程研究所 | A kind of device for testing aqueous porous media in frozen-thaw process reclaimed water thermal change feature |
| CN104730100A (en) * | 2015-03-05 | 2015-06-24 | 中国科学院寒区旱区环境与工程研究所 | Device for testing hydrothermal variation features of hydrous porous medium in freeze thawing process |
| CN104807975A (en) * | 2015-04-28 | 2015-07-29 | 西南石油大学 | Talus slope freezing and thawing circulating action deformation physical model experiment apparatus and experimental method |
| CN105334240A (en) * | 2015-11-11 | 2016-02-17 | 中国科学院武汉岩土力学研究所 | Rock fracture frost heaving deformation testing device |
| CN105334240B (en) * | 2015-11-11 | 2017-12-19 | 中国科学院武汉岩土力学研究所 | A kind of test device of rock fracture frost-heaving deformation amount |
| CN105973746A (en) * | 2016-01-25 | 2016-09-28 | 天津城建大学 | Apparatus for testing unfrozen water content of frozen soil, and method thereof |
| CN105628512A (en) * | 2016-03-23 | 2016-06-01 | 四川大学 | Test box and system capable of simulating mechanical property of test piece under freeze-thaw temperature load |
| CN106501489A (en) * | 2016-12-09 | 2017-03-15 | 长安大学 | Coarse Saline salt is swollen and molten sunken multifunction test device |
| CN107907227A (en) * | 2017-11-10 | 2018-04-13 | 敦煌研究院 | A kind of earthen ruins surface and the measuring method of internal temperature change |
| CN108614089A (en) * | 2018-05-09 | 2018-10-02 | 重庆交通大学 | Compacted fill freeze thawing and weathering environmental simulation system and its test method |
| CN110108861A (en) * | 2019-05-30 | 2019-08-09 | 西北农林科技大学 | A kind of auxiliary hot pin indoor model test device of research canal base day heat |
| CN110108861B (en) * | 2019-05-30 | 2022-02-15 | 西北农林科技大学 | Indoor model test device for researching channel-based natural auxiliary heating rod |
| CN113447639A (en) * | 2021-06-24 | 2021-09-28 | 中山大学 | Frozen soil freeze-thaw cycle process simulation device |
| CN113671151A (en) * | 2021-07-27 | 2021-11-19 | 西安科技大学 | Indoor model test system for icing evolution process of tillite |
| CN113671151B (en) * | 2021-07-27 | 2024-04-02 | 西安科技大学 | Indoor model test system for tillite ice-gathering evolution process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104267172B (en) | A kind of multifunctional all formula soil body freezing-thawing test system | |
| CN204154664U (en) | Soil sample freezing-thawing test device | |
| CN205826656U (en) | A kind of frozen soil freeze thawing laboratory testing rig | |
| CN202562912U (en) | Layered temperature controlling soil freezing and thawing cycle test device | |
| CN103743771B (en) | A kind of Frozen-thawed cycled pick-up unit being applicable to natural salt dirting soil | |
| CN104655823B (en) | A kind of frost heaving meter | |
| CN104749205A (en) | Water thermal force comprehensive testing system and method of soil body freezing process | |
| CN203287337U (en) | Soil body freezing-thawing process visualized testing device | |
| CN102590468A (en) | Testing system for deep soil freezing/thawing process | |
| CN207764217U (en) | A kind of earth pillar device of the one-dimensional hydro-thermal salt migration of closed simulation frozen soil | |
| CN106370816A (en) | Testing system capable of dynamically testing soil dehumidification/freezing water content change features | |
| CN203587589U (en) | Freezing-melting circulation detecting device suitable for natural saline soils | |
| CN104237305A (en) | Testing device and testing system for rock-mass thermal conductivity | |
| CN203990662U (en) | Standard moisture absorption moisture content experiment climatic chamber | |
| CN109668923B (en) | Method for testing upper limit change rule of frozen soil | |
| CN109187285A (en) | Seepage through soil mass experimental rig | |
| CN205643043U (en) | Testing instrument of triaxial test test soil body shear strength index | |
| CN109765259A (en) | A kind of changed based on soil water-stable aggregates determines frozen soil upper limit changing rule method and device | |
| CN101936704B (en) | Analog detecting method for concrete grown volume deformation and device thereof | |
| CN204536237U (en) | A kind of Freezing Soils hydro-thermal power comprehensive test system | |
| CN102998720A (en) | Method and device for calibrating dynamic response characteristic of sonde humidity by double flow method | |
| CN204479570U (en) | A kind of device for fast detecting being applicable to saliferous clay frost heave and molten sunken property | |
| CN205139059U (en) | Wall materials equivalent coefficient of heat conductivity measuring equipment | |
| CN202133659U (en) | Experimental device for monitoring swelling-shrinkage deformation of deep soil under influence of hot rainy weather | |
| CN114428024A (en) | Shear apparatus for freeze-thaw cycle shear test and test method |
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: 20150211 Termination date: 20181015 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |