CN205507575U - Frozen soil low temperature characteristics temperature control device for analysis - Google Patents
Frozen soil low temperature characteristics temperature control device for analysis Download PDFInfo
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- CN205507575U CN205507575U CN201620275264.2U CN201620275264U CN205507575U CN 205507575 U CN205507575 U CN 205507575U CN 201620275264 U CN201620275264 U CN 201620275264U CN 205507575 U CN205507575 U CN 205507575U
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- thaw cycle
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- temperature characteristics
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Abstract
The utility model discloses a frozen soil low temperature characteristics temperature control device for analysis, including freeze -thaw cycle case box and door, be equipped with glass observation window and touch liquid crystal display on the door, be equipped with heat -resisting baffle in the freeze -thaw cycle case box, be equipped with freeze thawing box and heating resistor silk in the freeze -thaw cycle case ante -chamber, the freeze thawing box includes box body and lid, the bottom is equipped with frozen soil test block rack in the box body, is equipped with temperature sensor on the inner wall of box body, is equipped with the temperature sensor wire hole on the lid, be equipped with compressor and freeze thawing state control ware in the freeze -thaw cycle case back cavity, compressor's air outlet is connected with out the tuber pipe, is provided with the backwind tube of being connected with compressor's return air inlet in the freeze -thaw cycle case ante -chamber, and freeze thawing state control ware includes microcontroller module, ac - DC converter circuit module and data memory module. The utility model discloses it is convenient and with low costs to realize, uses the simple operation, and temperature control accuracy is high, has improved freezing and thawing test efficiency and precision, convenient to popularize and use.
Description
Technical field
This utility model belongs to frozen soil low-temperature characteristics analysis technical field, is specifically related to a kind of frozen soil low-temperature characteristics analysis and uses
Attemperating unit.
Background technology
Frozen soil is the difficult point place of its Mechanical Characteristics change always cyopedology under freeze-thaw cycle effect, and it is main
Reason is: laboratory test condition does not reaches actual requirement, it is impossible to ensures the ground thermostatic control of little error, and cannot realize little temperature
Gradient changes solidification point, thus causes the time-consuming long of test, and result of the test error is relatively big, when equipment reaches requirement in temperature
Time, it is impossible to enough constant temperature effect that ensures accurately, and the change of proof box external environment condition is on test the temperature inside the box impact greatly.Tradition examination
Proved recipe method is usually: first arrange a certain temperature in general freeze-thaw cycle case, then test specimen is directly placed into freeze-thaw cycle case
In, freeze, but the change of ambient temperature is relatively big for the impact of freeze-thaw cycle the temperature inside the box, and adopt in freeze-thaw cycle case
With air cooling, test specimen is freezed, cause test specimen to be endured cold inequality, and last solidification point is with to envision solidification point error bigger.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned deficiency of the prior art, it is provided that a kind of frozen soil
Low-temperature characteristics analysis attemperating unit, its simple in construction, reasonable in design, it is achieved convenient and low cost, use simple operation, temperature
Control accuracy is high, improves freezing-thawing test efficiency and precision, and practical, using effect is good, it is simple to promote the use of.
For solving above-mentioned technical problem, the technical solution adopted in the utility model is: a kind of frozen soil low-temperature characteristics analysis is used
Attemperating unit, it is characterised in that: include freeze-thaw cycle box body and the door being rotatably connected on freeze-thaw cycle box body, described door
On be provided with glass window and touch LCD screen, the rear wall of described freeze-thaw cycle box body is provided with for accessing
The power input interface of 220V alternating current, is provided with in described freeze-thaw cycle box body for by internal for freeze-thaw cycle box body empty
Between be divided into freeze-thaw cycle case ante-chamber and the two-part heat-resisting dividing plate of freeze-thaw cycle case back cavity, set in described freeze-thaw cycle case ante-chamber
Being equipped with freeze thawing box and resistive heater, described freeze thawing box includes box body and the lid removably connected with box body, in described box body
Bottom is provided with the frozen soil test block rack for placing frozen soil test block, the inwall of described box body is provided with for freeze thawing box
The temperature sensor that interior temperature detects in real time, described lid is provided with the temperature that the holding wire for temperature sensor passes
Degree sensor wire hole；It is provided with refrigeration compressor and freeze thawing state controller, described refrigeration in described freeze-thaw cycle case back cavity
The air outlet connection of compressor has stretches into the discharge pipe in described freeze-thaw cycle case ante-chamber, described freeze-thaw cycle through heat-resisting dividing plate
The backwind tube that heat-resisting dividing plate is connected, described freeze thawing state controller it is provided through with the return air inlet of refrigeration compressor in case ante-chamber
Including micro controller module with for 220V alternating current being converted to each electricity consumption module required voltage in freeze thawing state controller
Ac-dc converter circuit module, and the data memory module connected with described micro controller module, described touch liquid crystal
Display screen connects with micro controller module, the holding wire of described temperature sensor pass after temperature sensor wire hole with microcontroller
The input of device module connects, and what the outfan of described micro controller module was connected to connect successively hands over for being switched on or switched off 220V
Stream supplies electricity to the first relay and first catalyst of the current supply circuit that refrigeration compressor is powered, and connect successively for connecting
Or disconnection 220V exchange supplies electricity to the second relay and second catalyst of the current supply circuit that resistive heater is powered, described first connects
Tentaculum is connected on 220V exchange and supplies electricity in the current supply circuit that refrigeration compressor is powered, and described second catalyst is connected on 220V exchange
Supply electricity in the current supply circuit that resistive heater is powered.
Above-mentioned a kind of frozen soil low-temperature characteristics analysis attemperating unit, it is characterised in that: described freeze-thaw cycle box body
Bottom even is provided with multiple support seat.
Above-mentioned a kind of frozen soil low-temperature characteristics analysis attemperating unit, it is characterised in that: described freeze-thaw cycle box body
It is provided with carrying handle on the sidewall of both sides.
Above-mentioned a kind of frozen soil low-temperature characteristics analysis attemperating unit, it is characterised in that: described door is by axis of rotation even
Being connected on freeze-thaw cycle box body, described freeze-thaw cycle box body is fixedly connected with the first magnetic suction with the one side surrounding of door laminating
Bar, the one side surrounding that described door is fitted with freeze-thaw cycle box body is fixedly connected with inhales the article matched with described first magnetic
Two magnetic inhale bar.
Above-mentioned a kind of frozen soil low-temperature characteristics analysis attemperating unit, it is characterised in that: arrange on the outer wall of described box body
There is the first engaging lug, described first engaging lug is provided with the first screwed hole, the outer wall of described lid is provided with first even
The second engaging lug that lug matches, described second engaging lug is provided with the second screwed hole closed with the first corresponding threaded holes,
Described lid can with box body by the bolt being connected in the second screwed hole and the first screwed hole and the nut being connected on bolt
Dismounting connects.
Above-mentioned a kind of frozen soil low-temperature characteristics analysis attemperating unit, it is characterised in that: set between described lid and box body
It is equipped with rubber washer.
Above-mentioned a kind of frozen soil low-temperature characteristics analysis attemperating unit, it is characterised in that: described box body and lid are aluminum
Double-decker processed.
Above-mentioned a kind of frozen soil low-temperature characteristics analysis attemperating unit, it is characterised in that: described frozen soil test block rack bag
Include four supporting legs and be arranged on the rectangle rack being provided with 3 × 3 rectangles placement lattice at four supporting leg tops, Mei Gesuo
State rectangle to place and be provided with multiple air-vent on the bottom of lattice and sidewall.
Above-mentioned a kind of frozen soil low-temperature characteristics analysis attemperating unit, it is characterised in that: described micro controller module is single
Sheet machine.
This utility model compared with prior art has the advantage that
1, simple in construction of the present utility model, reasonable in design, it is achieved convenient and low cost.
2, use simple operation of the present utility model, it is possible to realize little thermograde and control test block freeze thawing temperature, and temperature
Control accuracy is high.
3, this utility model is by arranging rubber washer between lid and box body, it is possible to play the effect of sealing, it is simple to
Reach high-precision temperature to control.
4, this utility model is effectively increased freezing-thawing test efficiency and precision, practical, and using effect is good, it is simple to promote
Use.
In sum, this utility model simple in construction, reasonable in design, it is achieved convenient and low cost, use simple operation, temperature
Degree control accuracy is high, improves freezing-thawing test efficiency and precision, and practical, using effect is good, it is simple to promote the use of.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is axonometric chart of the present utility model.
Fig. 2 is the top view of this utility model internal structure.
Fig. 3 is the structural representation of this utility model box body.
Fig. 4 is the top view of Fig. 3.
Fig. 5 is the structural representation of this utility model lid.
Fig. 6 is the structural representation of this utility model frozen soil test block rack.
Fig. 7 is the schematic block circuit diagram of this utility model freeze thawing state controller.
Description of reference numerals:
1 freeze-thaw cycle box body；2；3 glass windows；
4 freeze thawing state controllers；4-1 micro controller module；4-2 data memory module；
4-3 ac-dc converter circuit module；4-4 the first relay；4-5 the first catalyst；
4-6 the second relay；4-7 the second catalyst；5 touch LCD screens；
6 heat-resisting dividing plates；7 refrigeration compressors；8 resistive heaters；
9 freeze thawing boxes；9-1 box body；9-2 lid；
9-3 frozen soil test block rack；9-31 rectangle rack；9-32 supporting leg；
9-33 air-vent；9-4 temperature sensor；9-6 temperature sensor wire hole；
10 power input interfaces；11 220V alternating currents；12 support seat；
13 carrying handles；14 rotating shafts；15 discharge pipes；
16 backwind tubes.
Detailed description of the invention
As shown in Fig. 1～Fig. 7, frozen soil low-temperature characteristics analysis attemperating unit of the present utility model, including freeze-thaw cycle case
Casing 1 and the door 2 being rotatably connected on freeze-thaw cycle box body 1, described door 2 is provided with glass window 3 and touch liquid
Crystal display screen 5, the rear wall of described freeze-thaw cycle box body 1 is provided with the power input interface for accessing 220V alternating current 11
10, it is provided with before freeze-thaw cycle box body 1 inner space is divided into freeze-thaw cycle case in described freeze-thaw cycle box body 1
Chamber and the two-part heat-resisting dividing plate 6 of freeze-thaw cycle case back cavity, be provided with freeze thawing box 9 and add thermoelectricity in described freeze-thaw cycle case ante-chamber
Resistance silk 8, described freeze thawing box 9 includes box body 9-1 and the lid 9-2 removably connected with box body 9-1, described box body 9-1 inner bottom part
It is provided with the frozen soil test block rack 9-3 for placing frozen soil test block, the inwall of described box body 9-1 is provided with for freeze thawing
The temperature sensor 9-4 that temperature in box 9 detects in real time, described lid 9-2 is provided with the letter for temperature sensor 9-4
Number temperature sensor wire hole 9-6 that line passes；It is provided with refrigeration compressor 7 and freeze thawing state in described freeze-thaw cycle case back cavity
Controller 4, the air outlet connection of described refrigeration compressor 7 has to be stretched in described freeze-thaw cycle case ante-chamber through heat-resisting dividing plate 6
Discharge pipe 15, be provided through in described freeze-thaw cycle case ante-chamber that heat-resisting dividing plate 6 is connected with the return air inlet of refrigeration compressor 7 returns
Airduct 16, described freeze thawing state controller 4 includes micro controller module 4-1 and for 220V alternating current 11 is converted to freeze thawing shape
Ac-dc converter circuit module 4-3 of each electricity consumption module required voltage in state controller 4, and with described micro controller module 4-
The data memory module 4-2 that 1 connects, described touch LCD screen 5 connects with micro controller module 4-1, described temperature
The holding wire of sensor 9-4 is connected with the input of micro controller module 4-1 after passing temperature sensor wire hole 9-6, described
The outfan of micro controller module 4-1 be connected to connect successively for being switched on or switched off 220V alternating current 11 to refrigeration compressor 7
The first relay 4-4 and the first catalyst 4-5 of current supply circuit of power supply, and connect successively for being switched on or switched off 220V
The second relay 4-6 and the second catalyst 4-7 of the current supply circuit of resistive heater 8 power supply given by alternating current 11, and described first connects
Tentaculum 4-5 is connected in the 220V alternating current 11 current supply circuit to refrigeration compressor 7 power supply, described second catalyst 4-7 series connection
In the current supply circuit of resistive heater 8 power supply given by 220V alternating current 11.
As it is shown in figure 1, in the present embodiment, the bottom even of described freeze-thaw cycle box body 1 is provided with multiple support seat 12.
It is provided with carrying handle 13 on the both sides sidewall of described freeze-thaw cycle box body 1.
As in figure 2 it is shown, in the present embodiment, described door 2 is rotatably connected on freeze-thaw cycle box body 1 by rotating shaft 14, institute
The one side surrounding stating freeze-thaw cycle box body 1 and door 2 laminating is fixedly connected with the first magnetic suction bar, described door 2 and freeze-thaw cycle
The one side surrounding of box body 1 laminating is fixedly connected with inhales the second magnetic suction bar that bar matches with described first magnetic.
As shown in Fig. 3, Fig. 4 and Fig. 5, in the present embodiment, the outer wall of described box body 9-1 is provided with the first engaging lug 9-7,
It is provided with the first screwed hole 9-8 on described first engaging lug 9-7, the outer wall of described lid 9-2 is provided with and the first engaging lug
The second engaging lug 9-9 that 9-7 matches, described second engaging lug 9-9 is provided with second matched with the first screwed hole 9-8
Screwed hole 9-10, described lid 9-2 are by the bolt being connected in the second screwed hole 9-10 and the first screwed hole 9-8 and are connected to
Nut on bolt removably connects with box body 9-1.
In the present embodiment, between described lid 9-2 and box body 9-1, it is provided with rubber washer.By arranging rubber washer, energy
Enough play the effect of sealing, it is simple to reach high-precision temperature and control.
In the present embodiment, described box body 9-1 and lid 9-2 are aluminum double-decker.
As shown in Figure 6, in the present embodiment, described frozen soil test block rack 9-3 includes four supporting leg 9-32 and is arranged on
Article four, 3 × 3 rectangles that are provided with at supporting leg 9-32 top place the rectangle rack 9-31 of lattice, and each described rectangle places lattice
Bottom and sidewall on be provided with multiple air-vent 9-33.By arranging multiple air-vent 9-33, it is possible to ensure frozen soil test block
It is fully contacted with the saline solution added in freeze box 9.
In the present embodiment, described micro controller module 4-1 is single-chip microcomputer.
When this utility model uses, open door 2, take out freeze box 9, the lid 9-2 of freeze box 9 is opened, take out frozen soil
Test block rack 9-3, by frozen soil test block with after preservative film sealed envelope, is placed on frozen soil test block rack 9-3, then will freeze
Soil test block puts into freeze box 9 with frozen soil test block rack 9-3 entirety, and being slowly added to mass concentration in freeze box 9 is 25%
Saline solution, until filling, after the holding wire of temperature sensor 9-4 is passed temperature sensor wire hole 9-6, cover lid
9-2, firmly compacting, and after bolt being screwed in the second screwed hole 9-10 and the first screwed hole 9-8, fix with nut screwing clamping；Again
Freeze box 9 is loaded in described freeze-thaw cycle case ante-chamber, then, shuts up the door carefully 2, by power input interface 10 by power line with
220V alternating current 11 connects.
When freezing test to be carried out, solidification point, micro controller module are set by operation touch LCD screen 5
4-1 first controls the first relay 4-4 and connects, and makes the first catalyst 4-5 connect the current supply circuit of refrigeration compressor 7, refrigerant compression
Machine 7 starts, temperature sensor 9-4 the temperature in freeze thawing box 9 is detected in real time and by the signal real-time Transmission that detects to
Micro controller module 4-1, when detection temperature reaches solidification point in real time, micro controller module 4-1 controls the first relay 4-4
Disconnecting, make the first catalyst 4-5 disconnect the current supply circuit of refrigeration compressor 7, refrigeration compressor 7 is shut down, and cryostat is some little
Shi Hou, takes out frozen soil test block, i.e. can be used for the subsequent step of test.
When freezing and thawing test to be carried out, solidification point is set by operation touch LCD screen 5 and melts temperature
Degree, micro controller module 4-1 first controls the first relay 4-4 and connects, and makes the first catalyst 4-5 connect the confession of refrigeration compressor 7
Electricity loop, refrigeration compressor 7 starts, and the temperature in freeze thawing box 9 is detected and will detect by temperature sensor 9-4 in real time
Signal real-time Transmission is to micro controller module 4-1, and when detection temperature reaches solidification point in real time, micro controller module 4-1 is controlled
Making the first relay 4-4 to disconnect, make the first catalyst 4-5 disconnect the current supply circuit of refrigeration compressor 7, refrigeration compressor 7 is shut down,
After some hours of cryostat, micro controller module 4-1 controls the second relay 4-6 again and connects, and makes the second catalyst 4-7 connect
The current supply circuit of resistive heater 8, resistive heater 8 begins to warm up, and the temperature in freeze thawing box 9 is carried out by temperature sensor 9-4
In real time detection and by the signal real-time Transmission that detects to micro controller module 4-1, when in real time, detection temperature reaches melt temperature
Time, micro controller module 4-1 controls the second relay 4-6 and disconnects, and makes the second catalyst 4-7 disconnect the power supply of resistive heater 8
Loop, resistive heater 8 stops heating, and heated at constant temperature, after some hours, is recycled for above thermal exchange.
Owing to being the saline solution of 25% for mass concentration in freeze box 9, specific heat is relatively big, changes unwise for ambient temperature
Sense, and temperature sensor 9-4 is arranged on inside freeze box 9, it is used for sensing variations in temperature, the most accurately, it is possible to by temperature essence
Really control as temperature required.
The above, be only preferred embodiment of the present utility model, not impose any restrictions this utility model, every
Any simple modification, change and equivalent structure change above example made according to this utility model technical spirit, the most still
Belong in the protection domain of technical solutions of the utility model.
Claims (9)
1. a frozen soil low-temperature characteristics analysis attemperating unit, it is characterised in that: include freeze-thaw cycle box body (1) and the company of rotation
The door (2) being connected on freeze-thaw cycle box body (1), described door (2) is provided with glass window (3) and touch sensitive liquid crystal display
Screen (5), the rear wall of described freeze-thaw cycle box body (1) is provided with the power input interface for accessing 220V alternating current (11)
(10), it is provided with in described freeze-thaw cycle box body (1) and follows for freeze-thaw cycle box body (1) inner space is divided into freeze thawing
Ring case ante-chamber and the two-part heat-resisting dividing plate of freeze-thaw cycle case back cavity (6), be provided with freeze thawing box in described freeze-thaw cycle case ante-chamber
(9) and resistive heater (8), described freeze thawing box (9) includes box body (9-1) and the lid (9-removably connected with box body (9-1)
2), described box body (9-1) inner bottom part is provided with frozen soil test block rack (9-3) for placing frozen soil test block, described box body (9-
1) temperature sensor (9-4) for the temperature in freeze thawing box (9) is detected in real time, described lid it are provided with on inwall
(9-2) the temperature sensor wire hole (9-6) that the holding wire for temperature sensor (9-4) passes it is provided with on；Described freeze thawing follows
Being provided with refrigeration compressor (7) and freeze thawing state controller (4) in ring case back cavity, the air outlet of described refrigeration compressor (7) is even
It is connected to stretch into the discharge pipe (15) in described freeze-thaw cycle case ante-chamber, in described freeze-thaw cycle case ante-chamber through heat-resisting dividing plate (6)
Being provided through the backwind tube (16) that heat-resisting dividing plate (6) is connected with the return air inlet of refrigeration compressor (7), described freeze thawing state controls
Device (4) includes micro controller module (4-1) and for being converted to respectively use in freeze thawing state controller (4) by 220V alternating current (11)
The ac-dc converter circuit module (4-3) of electricity module required voltage, and the data connected with described micro controller module (4-1)
Memory module (4-2), described touch LCD screen (5) connects with micro controller module (4-1), described temperature sensor
(9-4) holding wire passes the temperature sensor wire hole (9-6) input afterwards with micro controller module (4-1) and is connected, described
The outfan of micro controller module (4-1) be connected to connect successively for being switched on or switched off 220V alternating current (11) to refrigerant compression
First relay (4-4) of the current supply circuit that machine (7) is powered and the first catalyst (4-5), and connect successively for connecting
Or the second relay (4-6) disconnecting the current supply circuit that 220V alternating current (11) is powered to resistive heater (8) contacts with second
Device (4-7), described first catalyst (4-5) is connected on the current supply circuit that 220V alternating current (11) is powered to refrigeration compressor (7)
In, described second catalyst (4-7) is connected on 220V alternating current (11) in the current supply circuit powered of resistive heater (8).
2. according to a kind of frozen soil low-temperature characteristics analysis attemperating unit described in claim 1, it is characterised in that: described freeze thawing follows
The bottom even of ring box body (1) is provided with multiple support seat (12).
3. according to a kind of frozen soil low-temperature characteristics analysis attemperating unit described in claim 1, it is characterised in that: described freeze thawing follows
Carrying handle (13) it is provided with on the both sides sidewall of ring box body (1).
4. according to a kind of frozen soil low-temperature characteristics analysis attemperating unit described in claim 1, it is characterised in that: described door (2)
Being rotatably connected on freeze-thaw cycle box body (1) by rotating shaft (14), described freeze-thaw cycle box body (1) and door (2) are fitted
Simultaneously surrounding is fixedly connected with the first magnetic suction bar, and the one side surrounding that described door (2) is fitted with freeze-thaw cycle box body (1) is fixed
Connect to have and inhale the second magnetic suction bar that bar matches with described first magnetic.
5. according to a kind of frozen soil low-temperature characteristics analysis attemperating unit described in claim 1, it is characterised in that: described box body
(9-1) it is provided with the first engaging lug (9-7) on outer wall, described first engaging lug (9-7) is provided with the first screwed hole (9-
8), the outer wall of described lid (9-2) is provided with the second engaging lug (9-9) matched with the first engaging lug (9-7), described
The second screwed hole (9-10) matched with the first screwed hole (9-8), described lid (9-2) it is provided with on two engaging lugs (9-9)
By the bolt being connected in the second screwed hole (9-10) and the first screwed hole (9-8) and the nut being connected on bolt and box body
(9-1) removably connect.
6. according to a kind of frozen soil low-temperature characteristics analysis attemperating unit described in claim 1, it is characterised in that: described lid
(9-2) and it is provided with rubber washer between box body (9-1).
7. according to a kind of frozen soil low-temperature characteristics analysis attemperating unit described in claim 1, it is characterised in that: described box body
(9-1) it is aluminum double-decker with lid (9-2).
8. according to a kind of frozen soil low-temperature characteristics analysis attemperating unit described in claim 1, it is characterised in that: described frozen soil tries
Block rack (9-3) include four supporting legs (9-32) and be arranged on four supporting leg (9-32) tops be provided with 3 × 3 squares
Shape places the rectangle rack (9-31) of lattice, and the bottom of each described rectangle placement lattice and sidewall are provided with multiple air-vent
(9-33)。
9. according to a kind of frozen soil low-temperature characteristics analysis attemperating unit described in claim 1, it is characterised in that: described microcontroller
Device module (4-1) is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620275264.2U CN205507575U (en) | 2016-04-05 | 2016-04-05 | Frozen soil low temperature characteristics temperature control device for analysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620275264.2U CN205507575U (en) | 2016-04-05 | 2016-04-05 | Frozen soil low temperature characteristics temperature control device for analysis |
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| Publication Number | Publication Date |
|---|---|
| CN205507575U true CN205507575U (en) | 2016-08-24 |
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ID=56736768
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| CN201620275264.2U Active CN205507575U (en) | 2016-04-05 | 2016-04-05 | Frozen soil low temperature characteristics temperature control device for analysis |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109407720A (en) * | 2018-12-12 | 2019-03-01 | 山东大学 | Seasonal frozen soil region railway tunnel freeze thawing circle control system and method |
| CN109506794A (en) * | 2018-10-24 | 2019-03-22 | 重庆大学 | A kind of measuring device of frozen soil starting solidification point |
-
2016
- 2016-04-05 CN CN201620275264.2U patent/CN205507575U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109506794A (en) * | 2018-10-24 | 2019-03-22 | 重庆大学 | A kind of measuring device of frozen soil starting solidification point |
| CN109407720A (en) * | 2018-12-12 | 2019-03-01 | 山东大学 | Seasonal frozen soil region railway tunnel freeze thawing circle control system and method |
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