A device for determining changes in substrate suction gradients

Abstract

This utility model discloses a device for measuring changes in matrix suction gradient, including a soil tensiometer body; a clay head is fixedly installed at the bottom of the soil tensiometer body, an electronic tensiometer is fixedly installed at the end of the soil tensiometer body away from the clay head, and a water inlet pipe is fixedly installed on one side of the soil tensiometer body, communicating with the soil tensiometer body, with a threaded cap threaded onto the water inlet pipe; this utility model, by fitting two semi-circular chucks onto the soil tensiometer body and fixing the two semi-circular chucks with pins, places the end of the support rod away from the semi-circular chucks on the ground, and inserts the rod into the support rod insertion hole to limit and fix the fixing plate, the cooperation of the support rod and the semi-circular chucks can provide support for the soil tensiometer body, preventing it from tilting due to collisions with external objects, making the device safer when continuously monitoring outdoors, and allowing the clay head at the bottom of the soil tensiometer body to maintain stable contact with the soil.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering technology, specifically to a device for measuring changes in matrix suction gradient. Background Technology

[0002] Matric suction is the force by which soil particles attract water, and it is the primary reason why soil retains moisture. It mainly originates from the molecular attraction between soil particle surfaces and water molecules, as well as the negative pressure generated by capillary action in soil pores. Matric suction has a significant impact on soil moisture retention, plant water uptake, soil engineering properties, and soil water movement. For example, plant roots must overcome matric suction to absorb water from the soil. Therefore, accurate measurement of matric suction is of great importance for studying soil moisture characteristics, guiding agricultural irrigation, and assessing soil engineering properties.

[0003] Tensiometers are commonly used to measure the suction of substrates outdoors. When it is necessary to monitor the substrate for a long time to obtain the value of its suction gradient change, the device needs to be installed outdoors for a long time. However, the device may tilt due to contact with external objects, especially animals. After the device tilts, the clay head will not make sufficient contact with the substrate, which will affect the monitoring data. Therefore, a device for measuring the change of substrate suction gradient is needed to meet people's needs. Utility Model Content

[0004] The purpose of this invention is to provide a device for measuring changes in the suction gradient of a matrix, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for measuring changes in matrix suction gradient, comprising a soil tensiometer body; a clay head is fixedly installed at the bottom of the soil tensiometer body, an electronic tensiometer is fixedly installed at the end of the soil tensiometer body away from the clay head, a water inlet pipe is fixedly installed on one side of the soil tensiometer body, the water inlet pipe communicates with the soil tensiometer body, a threaded cap is threadedly installed on the water inlet pipe, a support device is provided on the soil tensiometer body, and a protective device is provided on the support device;

[0006] Preferably, the support device includes a pair of interlocking semicircular chucks, which are together sleeved on the soil tensiometer body. A support rod is fixedly installed on each semicircular chuck, and fixing plates are fixedly installed at both ends of the support rod. The same pin is inserted into the pair of semicircular chucks.

[0007] Preferably, the pair of semi-circular chucks have chuck insertion holes, and the pin is inserted into the chuck insertion hole, with the pin and the chuck insertion hole having an interference fit.

[0008] Preferably, both the fixing plate on one side and the side of the semi-circular chuck have threaded holes, and the fixing plate on the other side has a support rod insertion hole.

[0009] Preferably, a fixing bolt is installed in the internal thread of the threaded hole, and a plug rod is inserted into the support rod insertion hole.

[0010] Preferably, the protective device includes a protective cover, and a fixing base is fixedly installed on the outside of the protective cover, and a protective insertion hole is opened on the fixing base.

[0011] Preferably, the protective cover is mounted on a fixed plate with a support rod insertion hole via a fixed base, and the support rod insertion hole is slidably installed inside the protective insertion hole.

[0012] Preferably, each side of the protective cover has a mesh opening, and a top row of pipes is fixedly installed on the top of the protective cover.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] (1) In this utility model, two semi-circular chucks are fitted on the soil tensiometer body, and the two semi-circular chucks are fixed by pins. The end of the support rod away from the semi-circular chucks is placed on the ground, and the pin is inserted into the support rod hole to limit and fix the fixing plate. The cooperation between the support rod and the semi-circular chucks can provide support for the soil tensiometer body, prevent it from tilting due to collision with external objects, make the device safer when continuously monitoring outdoors, and allow the clay head at the bottom of the soil tensiometer body to make stable contact with the soil.

[0015] (2) When the device is installed in a field or on land where animals may be present, the protective cover can be placed on the soil tensiometer body. When placing the cover, the protective insertion hole on the fixing seat should pass through the insertion rod. At this time, the protective cover is limited by the fixing seat through the insertion rod. At the same time, the protective cover can provide protection to prevent animals from touching the device. The top drain pipe above the protective cover protects the device while opening the top opening. Rainwater can pass through the top of the protective cover and fall onto the land normally, making the monitoring results more accurate. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a device for measuring changes in matrix suction gradient proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the support rod and fixing plate of the device for measuring the change of matrix suction gradient proposed in this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the soil tensiometer body and the clay head of the device for measuring the change of matrix suction gradient proposed in this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the device for measuring the change of matrix suction gradient proposed in this utility model, including the fixing plate and threaded hole.

[0020] Figure 5 This is a schematic diagram of the structure of the mesh and top row of pipes of the device for measuring the change of matrix suction gradient proposed in this utility model.

[0021] In the diagram: 1. Soil tensiometer body; 2. Support device; 3. Protective device; 4. Electronic tensiometer; 5. Clay head; 6. Water inlet pipe; 7. Threaded cap; 20. Semi-circular chuck; 21. Chuck insertion hole; 22. Pin; 23. Support rod; 24. Fixing plate; 25. Threaded hole; 26. Support rod insertion hole; 27. Insert rod; 30. Protective cover; 31. Fixing base; 32. Protective insertion hole; 33. Mesh; 34. Top row pipe. Detailed Implementation

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

[0023] Example 1: Please refer to Figure 1-4 This utility model provides a technical solution: a device for measuring changes in matrix suction gradient, including a soil tensiometer body 1; a clay head 5 is fixedly installed at the bottom of the soil tensiometer body 1, an electronic tensiometer 4 is fixedly installed at the end of the soil tensiometer body 1 away from the clay head 5, a water inlet pipe 6 is fixedly installed on one side of the soil tensiometer body 1, the water inlet pipe 6 is connected to the soil tensiometer body 1, a threaded cap 7 is threadedly installed on the water inlet pipe 6, a support device 2 is provided on the soil tensiometer body 1, and a protective device 3 is provided on the support device 2. The support device 2 supports the device to prevent tilting, and the protective device 3 covers the device to prevent collision with animals or other external objects.

[0024] To better support the device, the support device 2 includes a pair of interlocking semicircular chucks 20, which are together fitted onto the soil tensiometer body 1. A support rod 23 is fixedly mounted on each semicircular chuck 20, and fixing plates 24 are fixedly mounted at both ends of the support rod 23. A common pin 22 is inserted into each pair of semicircular chucks 20, and chuck insertion holes 21 are formed on each pair of semicircular chucks 20. The pin 22 is inserted into the chuck insertion hole 21 with an interference fit. Threaded holes 25 are formed on the side of both the fixing plate 24 and the side of the semicircular chuck 20, and a support rod insertion hole is formed on the fixing plate 24 on the other side. 26. A fixing bolt is installed in the internal thread of the threaded hole 25. A rod 27 is inserted into the support rod insertion hole 26. Before installation, the electronic tensiometer 4 should be calibrated to zero. During installation, a hole needs to be drilled in the soil to be monitored using a tool. The soil tensiometer body 1 is inserted into the hole through the clay head 5 at the bottom. The drilling depth should be such that after the soil tensiometer body 1 is inserted, both the water inlet pipe 6 and the electronic tensiometer 4 are above the soil surface. Open the threaded cap 7 and pour water into the soil tensiometer body 1 through the threaded cap 7. The water level should not be higher than the water inlet pipe 6. After filling with water, tighten the threaded cap 7. Because the clay head 5 is a porous material, the soil... Water inside the soil tensiometer body 1 flows into the clay head 5. The clay head 5 comes into contact with the soil. If the soil absorbs water, the lack of water inside the soil tensiometer body 1 will generate negative pressure in the cavity between the water surface and the electronic tensiometer 4. This negative pressure is sensed by the tension diaphragm on the electronic tensiometer 4 and fed back to the electronic tensiometer 4. The electronic tensiometer 4 can record values ​​in real time or intermittently. By recording multiple sets of data, the changes in soil suction gradient under different times and environments can be obtained. To ensure stable operation of the packaging during outdoor monitoring, after installing the soil tensiometer body 1, the pressure is measured by... Two semi-circular chucks 20 are fitted onto the soil tensile meter body 1 and fixed with pins 22. The fixing plate 24 at one end is fixed to the semi-circular chuck 20 through the threaded hole 25 by bolts. The end of the support rod 23 away from the semi-circular chuck 20 is placed on the ground, and the insertion rod 27 is inserted into the support rod insertion hole 26 to limit and fix the fixing plate 24. The cooperation between the support rod 23 and the semi-circular chuck 20 can provide support for the soil tensile meter body 1, preventing it from tilting due to collisions with external objects, making the device safer when continuously monitoring outdoors, and allowing the clay head 5 at the bottom of the soil tensile meter body 1 to repeatedly and stably contact the soil.

[0025] Example 2: As Figure 5To prevent animals from colliding with or touching the device, the protective device 3 includes a protective cover 30. A fixing base 31 is fixedly installed on the outside of the protective cover 30. The fixing base 31 has a protective insertion hole 32. The protective cover 30 is mounted on a fixing plate 24 with a support rod insertion hole 26 through the fixing base 31. The support rod insertion hole 26 is slidably installed in the protective insertion hole 32. Mesh holes 33 are opened on each side of the protective cover 30. A top pipe 34 is fixedly installed on the top of the protective cover 30. When the device is installed in a field or on land where animals may be present, the protective cover can be extended. The protective cover 30 is fitted onto the soil tensiometer body 1. When fitted, the protective insertion hole 32 on the fixing seat 31 passes through the insertion rod 27. At this time, the protective cover 30 is limited by the fixing seat 31 through the insertion rod 27. At the same time, the protective cover 30 can provide protection to prevent animals from touching the device. The top drain pipe 34 above the protective cover 30 protects the device while opening the top opening. Rainwater can pass through the top of the protective cover 30 and fall onto the ground normally, making the monitoring results more accurate. The other features are the same as in Embodiment 1.

[0026] The working principle is as follows: Before installation, the electronic tensiometer 4 is calibrated to zero. During installation, a hole needs to be drilled in the soil to be monitored using a tool, and the soil tensiometer body 1 is inserted into the hole through the bottom clay head 5. The drilling depth should be such that after the soil tensiometer body 1 is inserted, both the water inlet pipe 6 and the electronic tensiometer 4 are above the soil surface. Open the threaded cap 7 and pour water into the soil tensiometer body 1 through the threaded cap 7. The water level should not be higher than the water inlet pipe 6. After filling with water, tighten the threaded cap 7. Since the clay head 5 is a porous material, the water inside the soil tensiometer body 1 will flow into the clay head 5. Inside the soil head 5, the clay head 5 is in contact with the soil. If the soil absorbs water, the lack of water inside the soil tensiometer body 1 will generate negative pressure in the cavity between the water surface and the electronic tensiometer 4. This negative pressure is sensed by the tension diaphragm on the electronic tensiometer 4 and fed back to the electronic tensiometer 4. The electronic tensiometer 4 can record the values ​​in real time or intermittently. By recording multiple sets of data, the changes in soil suction gradient under different times and environments can be obtained. To ensure stable operation of the packaging during outdoor monitoring, after installing the soil tensiometer body 1, two... The semicircular chuck 20 is secured by two pins 22. A fixing plate 24 at one end is fixed to the semicircular chuck 20 via a threaded hole 25 using bolts. The support rod 23, with its end away from the semicircular chuck 20, is placed on the ground, and a plug 27 is inserted into the support rod plug hole 26 to limit and fix the fixing plate 24. The cooperation between the support rod 23 and the semicircular chuck 20 provides support for the soil tensiometer body 1, preventing it from tilting due to impacts from external objects. This makes the device safer during continuous outdoor monitoring and allows the clay head 5 at the bottom of the soil tensiometer body 1 to repeatedly contact the soil. For stable contact, when the device is installed in a field or on land where animals may be present, the protective cover 30 can be fitted onto the soil tensiometer body 1. When fitting, the protective insertion hole 32 on the fixing seat 31 should pass through the insertion rod 27. At this time, the protective cover 30 is limited by the fixing seat 31 through the insertion rod 27. At the same time, the protective cover 30 can provide protection to prevent animals from touching the device. The top drain pipe 34 above the protective cover 30 protects the device while opening the top opening. Rainwater can normally pass through the top of the protective cover 30 and fall onto the land through the top drain pipe 34, making the monitoring results more accurate.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for measuring changes in matrix suction gradient, comprising a soil tensiometer body (1); characterized in that: The soil tensiometer body (1) is fixedly installed with a clay head (5) at the bottom. An electronic tensiometer (4) is fixedly installed at the end of the soil tensiometer body (1) away from the clay head (5). A water supply pipe (6) is fixedly installed on one side of the soil tensiometer body (1). The water supply pipe (6) is connected to the soil tensiometer body (1). A threaded cap (7) is threaded on the water supply pipe (6). A support device (2) is provided on the soil tensiometer body (1). A protective device (3) is provided on the support device (2). The support device (2) includes a pair of interlocking semicircular chucks (20), which are together mounted on the soil tensiometer body (1). A support rod (23) is fixedly installed on the semicircular chucks (20), and a fixing plate (24) is fixedly installed at both ends of the support rod (23). The same pin (22) is inserted into the pair of semicircular chucks (20).

2. The device for measuring the change in matrix suction gradient according to claim 1, characterized in that: A pair of semi-circular chucks (20) are provided with chuck insertion holes (21), and the pin (22) is inserted into the chuck insertion hole (21), and the pin (22) and the chuck insertion hole (21) are interference fit.

3. The apparatus for measuring changes in matrix suction gradient according to claim 2, characterized in that: The fixing plate (24) on one side and the semi-circular chuck (20) on the side are both provided with threaded holes (25), and the fixing plate (24) on the other side is provided with a support rod insertion hole (26).

4. The apparatus for measuring changes in matrix suction gradient according to claim 3, characterized in that: A fixing bolt is installed in the internal thread of the threaded hole (25), and a plug rod (27) is inserted into the support rod insertion hole (26).

5. The apparatus for measuring changes in matrix suction gradient according to claim 4, characterized in that: The protective device (3) includes a protective cover (30), and a fixing seat (31) is fixedly installed on the outside of the protective cover (30). The fixing seat (31) has a protective insertion hole (32).

6. The apparatus for measuring the change in matrix suction gradient according to claim 5, characterized in that: The protective cover (30) is mounted on the fixing plate (24) with the support rod insertion hole (26) by the fixing base (31), and the support rod insertion hole (26) is slidably mounted in the protective insertion hole (32).

7. The apparatus for measuring changes in matrix suction gradient according to claim 6, characterized in that: The protective cover (30) has mesh holes (33) on each side, and a top row of pipes (34) is fixedly installed on the top of the protective cover (30).

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