A freezing and thawing cycle test device capable of automatically draining water from the top

Abstract

The application belongs to the technical field of indoor frozen soil one-way freeze-thaw test, and particularly relates to a freeze-thaw cycle test device capable of realizing automatic top drainage, comprising: a freeze-thaw cycle test box shell, a base is fixedly connected to the inner bottom wall of the freeze-thaw cycle test box shell, a plexiglass cylinder is fixedly connected to the top surface of the base, a heat preservation assembly is arranged on the outer side wall of the plexiglass cylinder, a bottom temperature control assembly is arranged at the bottom end of the plexiglass cylinder, a top temperature control assembly is arranged at the top end of the plexiglass cylinder, a soil sample is arranged between the bottom temperature control assembly and the top temperature control assembly, the soil sample is located in the plexiglass cylinder, and a top drainage mechanism is arranged on the inner side wall of the plexiglass cylinder. In the application, the top drainage mechanism is arranged on the side wall of the plexiglass cylinder, the drainage height of the top drainage mechanism can be changed along with the freeze-thaw deformation of the soil sample, and the functions of real-time positioning and real-time adjustment of the drainage height can be realized.

Description

Technical Field

[0001] This invention belongs to the field of indoor frozen soil unidirectional freeze-thaw test technology, and particularly relates to a freeze-thaw cycle test device that realizes automatic drainage from the top. Background Technology

[0002] Existing freeze-thaw cycle testing apparatuses only consider bottom water replenishment and drainage of the specimen, neglecting the drainage path from the top. Therefore, they cannot accurately reflect the moisture dissipation characteristics of thawed surface soil. Furthermore, frozen soil tests typically involve long testing cycles and numerous freeze-thaw cycles. As water gradually accumulates from the top of the frozen soil specimen, it inevitably leaks to the top of the cold plate. If this accumulated water is not drained promptly, it will freeze during the negative-temperature freezing cycle, binding the cold plate and the test cylinder together. This restricts the cold plate's vertical displacement, causing a gap between the cold plate and the top of the specimen, reducing cooling efficiency, affecting the accuracy of the displacement gauge on the top plate, and even limiting the frost heave deformation of the frozen soil, severely impacting the accuracy of the freeze-thaw cycle test structure. Summary of the Invention

[0003] The purpose of this invention is to provide a freeze-thaw cycle test device that enables automatic top drainage, in order to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] A freeze-thaw cycle test device for achieving automatic top drainage includes: a freeze-thaw cycle test chamber shell; a base fixed to the inner bottom wall of the freeze-thaw cycle test chamber shell; an acrylic tube fixed to the top surface of the base; a heat insulation component disposed on the outer side wall of the acrylic tube; a bottom temperature control component disposed at the bottom end of the acrylic tube; a top temperature control component disposed at the top end of the acrylic tube; a soil sample disposed between the bottom temperature control component and the top temperature control component; the soil sample being located inside the acrylic tube; and a top drainage mechanism disposed on the inner side wall of the acrylic tube.

[0006] Preferably, the top drainage mechanism includes a trapezoidal groove formed on the inner wall of the plexiglass cylinder. The trapezoidal groove is arranged along the length of the plexiglass cylinder. Magnetic water-stop strips are fixed to both sides of the groove opening. The two magnetic water-stop strips are in contact with each other, and a drainage hole is provided between the two magnetic water-stop strips. A rubber strip is inserted into the trapezoidal groove. A drainage groove is formed on the side of the rubber strip facing the inside of the plexiglass cylinder. The drainage groove is arranged along the length of the plexiglass cylinder. The drainage groove communicates with the drainage hole, and the bottom end of the drainage groove communicates with the external environment.

[0007] Preferably, a positioning drainage needle is attached to the top of the soil sample, and one end of the positioning drainage needle extends out of the soil sample and passes between the two magnetic water-stop strips to form the drainage hole.

[0008] Preferably, a ball check valve is provided at the bottom end of the trapezoidal groove. The ball check valve includes a valve body, which is located at the bottom end of the rubber strip and communicates with the drainage groove. A ball is placed at the top end of the valve body, and the bottom end of the valve body is in communication with the external environment.

[0009] Preferably, the top of the plexiglass tube is provided with a cover plate, and a plurality of through holes are evenly spaced around the outer edge of the cover plate. A vertically arranged support rod is inserted through the through holes. The top end of the support rod extends out of the through hole and is threaded with a nut. The bottom end of the support rod extends out of the through hole and is fixed to the top surface of the base.

[0010] Preferably, the insulation component includes insulation cotton covering the outer wall of the plexiglass cylinder.

[0011] Preferably, the bottom temperature control component includes a cold zone bottom plate disposed at the bottom end of the plexiglass cylinder, the cold zone bottom plate being connected to a refrigerant inlet pipe at the bottom plate and a refrigerant return pipe at the bottom plate.

[0012] Preferably, the top temperature control assembly includes a cold zone top plate disposed at the top of the plexiglass cylinder, the cold zone top plate being connected to a refrigerant inlet pipe at the top plate and a refrigerant return pipe at the top plate, and the soil sample being located between the cold zone top plate and the cold zone bottom plate.

[0013] Preferably, a water supply pipe is provided at the bottom of the soil sample, and the water supply pipe is connected to a Maslow bottle.

[0014] Compared with the prior art, the present invention has the following advantages and technical effects:

[0015] In this invention, a top drainage mechanism is provided on the side wall of the plexiglass cylinder. The drainage height of the top drainage mechanism can be changed according to the thawing and settling of the soil sample, thereby enabling real-time positioning and adjustment of the drainage height. This avoids the gradual accumulation of top drainage during the test, which would freeze into ice during the negative temperature freezing cycle of the test, freezing the cold plate and the test cylinder together, restricting the free vertical displacement of the cold plate, causing the cold plate to separate from the top of the sample and reducing the cooling efficiency, or affecting the accurate measurement of the displacement gauge above the top plate, and even limiting the frost heave deformation of the frozen soil, thus ensuring the accuracy of the freeze-thaw cycle test results. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the plexiglass tube in this invention;

[0019] Figure 3 for Figure 2 AA section view in the middle;

[0020] Figure 4 This is a schematic diagram of the connection between the positioning drainage needle and the magnetic waterstop strip in this invention;

[0021] The components include: 1. Freeze-thaw cycle test chamber shell; 2. Base; 3. Water supply pipe; 4. Marshall bottle; 5. Refrigerant inlet pipe at the bottom plate; 6. Refrigerant return pipe at the bottom plate; 7. Cold zone bottom plate; 8. Soil sample; 9. Support rod; 10. Insulation cotton; 11. Acrylic tube; 12. Trapezoidal groove; 13. Positioning drain needle; 14. Cold zone top plate; 15. Refrigerant inlet pipe at the top plate; 16. Refrigerant return pipe at the top plate; 17. Cover plate; 18. Nut; 19. Drainage recovery measuring cylinder; 20. Magnetic water stop strip; 21. Drainage groove; 22. Rubber strip; 23. Ball check valve; 24. Drain hole; 25. Valve body; 26. Ball. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Reference Figures 1 to 4This invention discloses a freeze-thaw cycle test device for achieving automatic top drainage, comprising: a freeze-thaw cycle test chamber shell 1, a base 2 fixedly connected to the inner bottom wall of the freeze-thaw cycle test chamber shell 1, an plexiglass tube 11 fixedly connected to the top surface of the base 2, a heat insulation component provided on the outer side wall of the plexiglass tube 11, a bottom temperature control component provided at the bottom end of the plexiglass tube 11, a top temperature control component provided at the top end of the plexiglass tube 11, a soil sample 8 provided between the bottom temperature control component and the top temperature control component, the soil sample 8 being located inside the plexiglass tube 11, and a top drainage mechanism provided on the inner side wall of the plexiglass tube 11.

[0025] Further optimization of the scheme: The top drainage mechanism includes a trapezoidal groove 12 on the inner wall of the plexiglass cylinder 11. The trapezoidal groove 12 is set along the length of the plexiglass cylinder 11. Magnetic water-stop strips 20 are fixed to both sides of the groove opening of the trapezoidal groove 12. The two magnetic water-stop strips 20 are in contact with each other, and a drainage hole 24 is set between the two magnetic water-stop strips 20. A rubber strip 22 is inserted into the trapezoidal groove 12. A drainage groove 21 is opened on the side of the rubber strip 22 facing the inside of the plexiglass cylinder 11. The drainage groove 21 is set along the length of the plexiglass cylinder 11. The drainage groove 21 is connected to the drainage hole 24. The bottom end of the drainage groove 21 is connected to the external environment.

[0026] The height of trapezoidal groove 12 is greater than the height of soil sample 8.

[0027] When thaw settlement occurs in soil sample 8, the water generated by the thaw settlement enters the drainage channel 21 through the drainage hole 24, and then is discharged from the plexiglass tube 11 through the drainage channel 21, so as to avoid the accumulation of seepage water generated by thaw settlement on the top of soil sample 8 and affecting the freeze-thaw cycle test.

[0028] To further optimize the design, a positioning drainage needle 13 is attached to the top of the soil sample 8. One end of the positioning drainage needle 13 protrudes from the soil sample 8 and enters between the two magnetic water-stop strips 20 to form a drainage hole 24.

[0029] The positioning drainage needle 13 is embedded in the soil sample 8. One end of the needle protrudes from the soil sample 8 and passes between the two magnetic water-stop strips 20 to form a drainage hole 24. When the soil sample 8 settles, the positioning drainage needle 13 moves down with the soil sample 8, thereby driving the drainage hole 24 down, thus realizing the function of accurate positioning and real-time adjustment of drainage height.

[0030] To further optimize the design, a ball check valve 23 is installed at the bottom of the trapezoidal groove 12. The ball check valve 23 includes a valve body 25, which is located at the bottom of the rubber strip 22 and connected to the drainage groove 21. A ball 26 is placed at the top of the valve body 25, and the bottom of the valve body 25 is connected to the external environment.

[0031] The ball check valve 23 is made of nylon. The ball 26 of the ball check valve 23 is a rubber ball, which moves up and down within the drain trough 21 in a short stroke to open and close the ball check valve 23. When the buoyancy of the water in the drain trough 21 exceeds the weight of the ball 26, the ball 26 moves away from the valve body 25, and the ball check valve 23 opens. After the water is drained, due to its own weight, the ball 26 falls back onto the valve body 25, and the ball check valve 23 closes. The ball 26 is a hollow steel ball covered with highly elastic rubber. The rubber is non-toxic natural rubber, and the specific gravity of the sealing ball should meet the opening head requirements of the ball check valve 23. This ensures a tight seal while minimizing damage to the drainage system during the closing process of the ball check valve 23.

[0032] Water enters the drain trough 21 through the drain hole 24 and then falls above the ball check valve 23. At this time, the ball 26 floats up under the action of the water. The water flows into the drain recovery cylinder 19 through the valve body 25. Then the ball 26 falls down and blocks the valve body 25 to prevent external fluids or airflow from entering the plexiglass cylinder 11.

[0033] The ball-shaped check valve 23, the magnetic water-stop strip 20, and the drainage channel 21 are integrated into one unit by the rubber strip 22, which makes it easy to replace and clean.

[0034] In a further optimized design, a cover plate 17 is provided at the top of the plexiglass tube 11. Multiple through holes are evenly spaced around the outer edge of the cover plate 17. A vertically arranged support rod 9 is inserted through the through holes. The top of the support rod 9 protrudes from the through holes and is threaded with a nut 18. The bottom of the support rod 9 protrudes from the through holes and is fixed to the top surface of the base 2.

[0035] The cover plate 17 is detachably installed on the top of the plexiglass tube 11 by several support rods 9, which facilitates the replacement of soil samples.

[0036] The solution is further optimized by including insulation cotton 10 wrapped around the outer wall of the plexiglass cylinder 11.

[0037] The temperature inside the acrylic glass cylinder 11 is maintained by the insulation cotton 10 to prevent temperature loss from affecting the accuracy of the test.

[0038] Further optimizing the design, the bottom temperature control component includes a cold zone base plate 7 located at the bottom of the plexiglass cylinder 11. The cold zone base plate 7 is connected to a refrigerant inlet pipe 5 and a refrigerant return pipe 6. Both the refrigerant inlet pipe 5 and the refrigerant return pipe 6 are installed inside the base 2. One end of the refrigerant inlet pipe 5 and the refrigerant return pipe 6 are connected to the cold zone base plate 7, and the other end extends out of the base 2 and is connected to an external cooling mechanism.

[0039] Further optimizing the design, the top temperature control component includes a cold zone top plate 14 located at the top of the plexiglass cylinder 11. The cold zone top plate 14 is connected to a refrigerant inlet pipe 15 and a refrigerant return pipe 16. The soil sample 8 is located between the cold zone top plate 14 and the cold zone bottom plate 7. The refrigerant inlet pipe 15 and the refrigerant return pipe 16 are inserted into a cover plate 17. One end of the refrigerant inlet pipe 15 and the refrigerant return pipe 16 extends out of the cover plate 17 and connects to the cold zone top plate 14, while the other end extends out of the cover plate 17 and connects to an external cooling mechanism. The cold zone top plate 14 is vertically slidably connected inside the plexiglass cylinder 11.

[0040] To further optimize the design, a water supply pipe 3 is installed at the bottom of soil sample 8, and the water supply pipe 3 is connected to a Mascher bottle 4.

[0041] The Mascher bottle 4 replenishes water into the soil sample 8 through the water supply pipe 3.

[0042] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0043] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A freeze-thaw cycle test device for achieving automatic top drainage, characterized in that, include: The freeze-thaw cycle test chamber has an outer shell (1), a base (2) is fixedly attached to the inner bottom wall of the outer shell (1), an plexiglass tube (11) is fixedly attached to the top surface of the base (2), an insulation component is provided on the outer wall of the plexiglass tube (11), a bottom temperature control component is provided at the bottom end of the plexiglass tube (11), a top temperature control component is provided at the top end of the plexiglass tube (11), a soil sample (8) is provided between the bottom temperature control component and the top temperature control component, the soil sample (8) is located inside the plexiglass tube (11), and a top drainage mechanism is provided on the inner wall of the plexiglass tube (11). The top drainage mechanism includes a trapezoidal groove (12) opened on the inner side wall of the plexiglass cylinder (11). The trapezoidal groove (12) is arranged along the length direction of the plexiglass cylinder (11). Magnetic water-stop strips (20) are fixed to both sides of the groove opening of the trapezoidal groove (12). The two magnetic water-stop strips (20) are attached together, and a drainage hole (24) is provided between the two magnetic water-stop strips (20). A rubber strip (22) is inserted into the trapezoidal groove (12). A drainage groove (21) is opened on the side of the rubber strip (22) facing the inside of the plexiglass cylinder (11). The drainage groove (21) is arranged along the length direction of the plexiglass cylinder (11). The drainage groove (21) is connected to the drainage hole (24), and the bottom end of the drainage groove (21) is connected to the external environment. The top of the soil sample (8) is attached with a positioning drainage needle (13), one end of which protrudes from the soil sample (8) and passes between the two magnetic water-stop strips (20) to form the drainage hole (24). A ball check valve (23) is provided at the bottom of the trapezoidal groove (12). The ball check valve (23) includes a valve body (25). The valve body (25) is located at the bottom of the rubber strip (22) and is connected to the drainage groove (21). A ball (26) is placed at the top of the valve body (25). The bottom of the valve body (25) is connected to the external environment.

2. The freeze-thaw cycle test device for realizing automatic top drainage according to claim 1, characterized in that: The top of the plexiglass tube (11) is provided with a cover plate (17). Multiple through holes are evenly spaced around the outer edge of the cover plate (17). A vertically arranged support rod (9) is inserted through the through hole. The top of the support rod (9) extends out of the through hole and is threaded with a nut (18). The bottom of the support rod (9) extends out of the through hole and is fixed to the top surface of the base (2).

3. The freeze-thaw cycle test device for realizing automatic top drainage according to claim 1, characterized in that: The insulation component includes insulation cotton (10) covering the outer wall of the plexiglass cylinder (11).

4. The freeze-thaw cycle test device for realizing automatic top drainage according to claim 1, characterized in that: The bottom temperature control component includes a cold zone bottom plate (7) disposed at the bottom end of the plexiglass cylinder (11), and the cold zone bottom plate (7) is connected to a refrigerant inlet pipe (5) at the bottom plate and a refrigerant return pipe (6) at the bottom plate.

5. A freeze-thaw cycle test device for realizing automatic top drainage according to claim 4, characterized in that: The top temperature control assembly includes a cold zone top plate (14) disposed at the top of the plexiglass cylinder (11), the cold zone top plate (14) being connected to a refrigerant inlet pipe (15) at the top plate and a refrigerant return pipe (16) at the top plate, and the soil sample (8) being located between the cold zone top plate (14) and the cold zone bottom plate (7).

6. The freeze-thaw cycle test device for realizing automatic top drainage according to claim 1, characterized in that: The bottom of the soil sample (8) is provided with a water supply pipe (3), which is connected to a Mascher bottle (4).

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