A saline soil expansion force measuring tester

Abstract

The present application relates to the technical fields of soil swelling force determination, and discloses a saline soil swelling force determination tester, which comprises a base, a material storage mechanism and a force measuring mechanism; the material storage mechanism comprises a material storage box arranged at one end of the base, a soil retaining plate which is slidably connected to the middle part of the material storage box, and the side of the material storage box close to the center of the base and the side of the material storage box away from the base are both open; the force measuring mechanism comprises a water tank arranged at the side of the base away from the material storage box, a first piston which is slidably connected to the side of the water tank close to the center of the base, a push rod arranged at the side of the first piston close to the center of the base, and a soil retaining plate fixedly connected to the end of the push rod; a pressure measuring water pipe which is in communication with the inside of the water tank is vertically arranged at the middle part of the water tank, and a floating block is arranged in the inside of the pressure measuring water pipe. The present application is suitable for a saline soil swelling force determination tester, which can measure the swelling force of saline soil under different working conditions by detecting the swelling force of the saline soil in the material storage box in real time through the pressure measuring water pipe arranged at the right side of the base.

Description

Technical Field

[0001] This invention relates to the field of soil swelling force measurement technology, specifically a testing instrument for measuring the swelling force of saline soil. Background Technology

[0002] In addition to solution subsidence deformation, the sodium sulfate in saline soil will also undergo significant volume deformation when temperature and humidity change, causing the foundation to expand or contract. Therefore, in actual construction environments, in order to verify the impact of saline soil expansion on buildings, it is necessary to test the expansion of saline soil before construction.

[0003] Conventional testing methods involve placing saline soil in a container and installing a pressure sensor on the side wall of the container to detect the expansion force of the saline soil. However, this method can only detect the static expansion force of saline soil. In actual working conditions, the volume of saline soil changes due to expansion. The expansion force of saline soil after volume change is more suitable for model research. Therefore, it is necessary to design an expansion force testing instrument for this working condition. Summary of the Invention

[0004] This invention provides a testing instrument for measuring the swelling force of saline soil, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A test instrument for measuring the swelling force of saline soil includes a base, a material storage mechanism, and a force measuring mechanism;

[0007] The material storage mechanism includes a material storage box located at one end of the base, with a retaining plate slidably connected to the middle of the material storage box. The side of the material storage box near the center of the base and the side away from the base are both open.

[0008] The force measuring mechanism includes a water tank located on the side of the base away from the storage bin, a first piston slidably connected to the side of the water tank near the center of the base, a push rod provided on the side of the first piston near the center of the base, a retaining plate fixedly connected to the end of the push rod, and a pressure measuring water pipe vertically provided in the middle of the water tank, which is in communication with the inside of the water tank, and a floating block provided inside the pressure measuring water pipe.

[0009] As a preferred embodiment of the present invention, the pressure measuring water pipe is slidably connected to a sliding ring, a drain pipe is provided on the outer side of the sliding ring, and a water outlet pipe is provided in the middle of the floating block, the water outlet pipe being connected to the drain pipe through a flexible hose.

[0010] As a preferred embodiment of the present invention, the drain pipe is provided with a throttling valve.

[0011] As a preferred embodiment of the present invention, the outer side of the sliding ring is threaded with a locking bolt that mates with the pressure measuring water pipe.

[0012] As a preferred embodiment of the present invention, a second piston is slidably connected to the side of the water tank away from the center of the base, and a second lead screw that is threadedly connected to the water tank is rotatably connected to the second piston.

[0013] As a preferred embodiment of the present invention, a support plate is provided in the middle of the base, a first lead screw is threadedly connected to one side of the support plate, a pressure sensor is rotatably connected to the end of the first lead screw near the storage box, and a stop bar that cooperates with the pressure sensor is provided in the middle of the push rod.

[0014] As a preferred embodiment of the present invention, the support plate is provided with a clearance hole in the middle, and the push rod passes through and connects to the clearance hole.

[0015] The present invention has the following advantages:

[0016] This invention relates to a saline soil swelling force testing instrument. By detecting the swelling force of saline soil in the storage tank in real time through the pressure measuring water pipe on the right side of the base, the swelling force of saline soil can be measured under different working conditions. The test results are more consistent with the actual working conditions and the data is more authentic. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced 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.

[0018] Figure 1 This is a schematic diagram of a test instrument for measuring the swelling force of saline soil.

[0019] Figure 2 This is a front view of a testing instrument for measuring the swelling force of saline soil.

[0020] Figure 3 This is a schematic diagram of the material storage mechanism in a saline soil swelling force testing instrument.

[0021] Figure 4 This is a front view of the material storage mechanism in a saline soil swelling force testing instrument.

[0022] Figure 5 This is a schematic diagram of the force measuring mechanism in a saline soil swelling force testing instrument.

[0023] Figure 6This is a front view of the force measuring mechanism in a saline soil swelling force testing instrument.

[0024] In the diagram: 1. Base; 2. Material storage mechanism; 3. Force measuring mechanism; 4. Material storage box; 5. Retaining plate; 6. Support plate; 7. First lead screw; 8. Pressure sensor; 9. Stop bar; 10. Push rod; 11. Clearance hole; 12. Support frame; 13. Cover plate; 14. First guide rod; 15. Cylinder; 16. Pressure plate; 17. Water tank; 18. First piston; 19. Second piston; 20. Second lead screw; 21. Second guide rod; 22. Pressure measuring water pipe; 23. Floating block; 24. Water outlet pipe; 25. Locking bolt; 26. Sliding ring; 27. Hose; 28. Drain pipe. Detailed Implementation

[0025] 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.

[0026] In one embodiment, see Figures 1-6 A test instrument for measuring the swelling force of saline soil includes a base 1, a material storage mechanism 2, and a force measuring mechanism 3;

[0027] The material storage mechanism 2 includes a material storage box 4 disposed at one end of the base 1. A retaining plate 5 is slidably connected to the middle of the material storage box 4. The side of the material storage box 4 closest to the center of the base 1 and the side furthest from the base 1 are both open. The material storage box 4 is disposed on the left side of the upper surface of the base 1, and the top and right sides of the material storage box 4 are open, so that the retaining plate 5 can move left and right in the material storage box 4. The expansion deformation of the saline soil can be converted into the displacement of the retaining plate 5.

[0028] The force measuring mechanism 3 includes a water tank 17 located on the side of the base 1 away from the storage bin 4. A first piston 18 is slidably connected to the side of the water tank 17 near the center of the base 1. A push rod 10 is provided on the side of the first piston 18 near the center of the base 1. The end of the push rod 10 is fixedly connected to a retaining plate 5. A pressure measuring water pipe 22 communicating with the inside of the water tank 17 is vertically provided in the middle of the water tank 17. A floating block 23 is provided inside the pressure measuring water pipe 22. The water tank 17 is located on the right side of the base 1. The pressure measuring water pipe 22 is located in the middle of the upper surface of the water tank 17. The floating block 23 is located in the middle of the pressure measuring water pipe 22. At the same time, the first piston 18 can slide left and right on the left side of the water tank 17, so that the displacement of the retaining plate 5 can be converted into a change in the water level in the pressure measuring water pipe 22.

[0029] In one embodiment, a sliding ring 26 is slidably connected to the outside of the pressure-measuring water pipe 22. A drain pipe 28 is provided on the outside of the sliding ring 26, and a water outlet pipe 24 is provided in the middle of the float block 23. The water outlet pipe 24 is connected to the drain pipe 28 through a flexible hose 27. A locking bolt 25 that mates with the pressure-measuring water pipe 22 is threaded onto the outside of the sliding ring 26. The height of the drain pipe 28 can be adjusted by the sliding ring 26, thereby changing the water level in the pressure-measuring water pipe 22 through the effect of a communicating vessel. The locking bolt 25 fixes the height of the sliding ring 26. A throttle valve is provided inside the drain pipe 28, and the flow of water from the drain pipe 28 can be controlled by controlling the opening and closing of the throttle valve.

[0030] In one embodiment, a second piston 19 is slidably connected to the side of the water tank 17 away from the center of the base 1. A second lead screw 20, threadedly connected to the water tank 17, is rotatably connected to the second piston 19. Second guide rods 21 are provided on the upper and lower sides of the second piston 19. The second guide rods 21 can slide against the side wall of the water tank 17, providing a guiding effect and allowing the second piston 19 to move stably left and right, adjusting the volume of water in the entire water tank 17, thus preparing for subsequent water pressure adjustment.

[0031] In one embodiment, a support plate 6 is provided in the middle of the base 1. A first lead screw 7 is threadedly connected to one side of the support plate 6. A pressure sensor 8 is rotatably connected to the end of the first lead screw 7 near the storage bin 4. A stop bar 9 that cooperates with the pressure sensor 8 is provided in the middle of the push rod 10. The support plate 6 is arranged in the middle of the base 1 with the front and back facing each other, and the support plate 6 is located between the water tank 17 and the storage bin 4. The pressure sensor 8 can be moved left and right by the first lead screw 7, so that the pressure of the first lead screw 7 on the retaining plate 5 can be detected by the pressure sensor 8, thereby obtaining the pressure caused by the expansion force on the retaining plate 5. A clearance hole 11 is provided in the middle of the support plate 6, and the push rod 10 passes through and connects to the clearance hole 11.

[0032] In one embodiment, a support frame 12 is provided on the side of the storage bin 4 away from the center of the base 1. A cylinder 15 is provided on the support frame 12, and the piston rod of the cylinder 15 is fixedly connected to a cover plate 13 that cooperates with the storage bin 4. A pressure plate 16 is provided on the cover plate 13 that matches the opening size of the storage bin 4. The size of the cover plate 13 is larger than the size of the opening above the storage box 4, and the size of the pressure plate 16 is smaller than the size of the opening above the storage box 4. Therefore, when the cylinder 15 moves the cover plate 13 downward, the cover plate 13 falls exactly above the storage box 4. At this time, the pressure plate 16 can enter the interior of the storage box 4 to compact the saline soil. At this time, the height of the pressure plate 16 and the bottom of the storage box 4 is exactly the height of the retaining plate 5, so that the expansion of the saline soil can only move to the right, avoiding the loss of expansion force. In order to ensure that the cover plate 13 moves vertically up and down, the first guide rod 14 is set on both sides of the cover plate 13. The first guide rod 14 is slidably connected to the support frame 12. The support frame 12 is L-shaped, and the top of the support frame 12 is a flat plate, thereby providing a stable downward force value.

[0033] In this embodiment, the device is first placed stably on the ground, and the cover plate 13 is moved upward by the cylinder 15. The saline soil to be tested is placed inside the storage box 4. The cylinder 15 is then started in reverse, and the cover plate 13 falls above the storage box 4. At this time, the storage box 4, the pressure plate 16 and the retaining plate 5 form a cavity, and the saline soil is inside the cavity.

[0034] According to the requirements of some tests, a certain pressure needs to be applied to the saline soil in the early stage of the test. At this time, the pressure sensor 8 can be moved to the left by rotating the first lead screw 7. The pressure sensor 8 will contact the stop bar 9, thereby pushing the retaining plate 5 to the left through the push rod 10. At this time, the saline soil is compacted, and the compaction force is the same as the reading of the pressure sensor 8, thus completing the pre-compacting process.

[0035] Experimental Method 1: Measuring the change in expansion force in a fixed volume.

[0036] In this test method, it is only necessary to rotate the first screw 7 to adjust the left and right position of the retaining plate 5, so that the expansion force of the saline soil can be obtained through the pressure sensor 8. This is also a conventional measurement method.

[0037] Test Method Two: Fixed pressure to measure the volume of expansion.

[0038] First, loosen the first screw 7, change the height of the drain pipe 28 by moving the sliding ring 26 up and down, and open the throttle valve of the drain pipe 28 so that the water in the drain pipe 28 can be discharged. At this time, the pressure on the first piston 18 is the expansion force on the baffle plate 5. At this time, due to the distance of the communicating vessel, the height of the floating block 23 and the drain pipe 28 is the same. That is to say, the water pressure on the first piston 18 is the liquid level of the pressure measuring water pipe 22, thereby achieving fixed pressure control. When the expansion force is large, the baffle plate 5 will move to the right, and the first piston 18 will move to the right, so that the water in the pressure measuring water pipe 22 will be discharged from the drain pipe 28, thereby ensuring continuous fixed pressure. The volume change of the saline soil can be obtained by the displacement of the baffle plate 5. In order to ensure that there is a constant water in the water tank 17 to achieve a fixed pressure difference, the position of the second piston 19 on the right can be adjusted in time.

[0039] Test Method 3: Measure the maximum expansion force under free volume change.

[0040] Open the throttle valve of the drain pipe 28 and loosen the first screw 7. At this time, the retaining plate 5 moves to the right under the action of the expansion force of the saline soil, which causes the first piston 18 to move to the right. At this time, the water level in the pressure measuring water pipe 22 changes, that is, the expansion force changes.

[0041] This invention relates to a saline soil swelling force testing instrument. By detecting the swelling force of saline soil in storage tank 4 in real time through the pressure measuring water pipe 22 on the right side of the base 1, the swelling force of saline soil can be measured under different working conditions. The test results are more in line with the actual working conditions and the data is more authentic.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A testing instrument for determining the swelling force of saline soil, characterized in that, Includes a base, a material storage mechanism, and a force measuring mechanism; The material storage mechanism includes a material storage box located at one end of the base, with a retaining plate slidably connected to the middle of the material storage box. The side of the material storage box near the center of the base and the side away from the base are both open. The force measuring mechanism includes a water tank located on the side of the base away from the storage bin, a first piston slidably connected to the side of the water tank near the center of the base, a push rod provided on the side of the first piston near the center of the base, a retaining plate fixedly connected to the end of the push rod, and a pressure measuring water pipe vertically provided in the middle of the water tank that communicates with the inside of the water tank, and a floating block provided inside the pressure measuring water pipe. The pressure measuring water pipe is slidably connected to a sliding ring, and a drain pipe is provided on the outer side of the sliding ring. A water outlet pipe is provided in the middle of the floating block, and the water outlet pipe is connected to the drain pipe through a flexible hose. A second piston is slidably connected to the side of the water tank away from the center of the base. A second screw is rotatably connected to the second piston and threaded to the water tank. A support plate is provided in the middle of the base. A first screw is threaded to one side of the support plate. A pressure sensor is rotatably connected to the end of the first screw near the storage box. A stop bar that cooperates with the pressure sensor is provided in the middle of the push rod.

2. The apparatus for determining the swelling force of saline soil according to claim 1, characterized in that, The drain pipe is equipped with a throttling valve inside.

3. The apparatus for determining the swelling force of saline soil according to claim 1, characterized in that, The outer thread of the sliding ring is connected to a locking bolt that mates with the pressure measuring water pipe.

4. The apparatus for determining the swelling force of saline soil according to claim 1, characterized in that, The support plate has a clearance hole in the middle, and the push rod passes through the clearance hole.

5. The apparatus for determining the swelling force of saline soil according to claim 1, characterized in that, The storage bin is provided with a support frame on the side away from the center of the base. A cylinder is provided on the support frame, and the piston rod of the cylinder is fixedly connected to a cover plate that cooperates with the storage bin.

6. The apparatus for determining the swelling force of saline soil according to claim 5, characterized in that, The cover plate is equipped with a pressure plate that matches the opening size of the storage box.

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