Water stop device for measuring peripheral cracks of soil body of pit

Abstract

The utility model relates to the technical field of irrigation and water conservancy, in particular to a water stopping device for measuring cracks around a pit soil body. A water stop device is additionally arranged on the inner wall of an original measuring pit on the basis of the original measuring pit, and a water stop connecting assembly comprises a V-shaped water stop groove, a fixing bolt, a rubber pad and an expansion water stop belt. One side of the water stop connecting assembly is connected with the inner wall of the measuring pit, the other side of the water stop connecting assembly is connected with a soil body formed by soil in the measuring pit, and the water stop connecting assembly is used for preventing water from moving along a gap between the soil body and the inner wall of the measuring pit. The device can plug the crack between the soil body and the wall of the measuring pit, can solve the problem that the crack around the soil of the measuring pit seeps downwards preferentially in the irrigation process, is simple in structure, low in manufacturing cost, convenient to operate and high in generalization and practicability, and improves the precision and scientificity of experimental research.

Description

A water-stopping device for cracks around the soil in a test pit Technical Field

[0001] This utility model relates to the field of farmland water conservancy technology, and in particular to a water-stopping device for cracks around the soil of a measuring pit. Background Technology

[0002] The measuring pit is a commonly used device in crop irrigation and drainage experiments. It is either enclosed on all sides and bottom (with a bottom measuring pit) or open at the bottom (without a bottom measuring pit). The walls are usually made of concrete, steel plates, or polymer panels, while the top is open to allow for crop growth. It contains soil, bottom filter media, water supply and drainage systems, and monitoring systems. It is used to conduct crop irrigation and drainage, water and salt transport experiments, simulating the feedback relationships between crop yield and irrigation and drainage regulation, evapotranspiration, soil moisture, runoff, infiltration, and changing environmental factors. Due to its ability to precisely control variables and relatively isolate natural variations, it is widely used in related experimental research.

[0003] Soil moisture in the test pit changes dynamically due to irrigation, evaporation (transpiration), and seepage, causing soil swelling and shrinkage effects. Under water-deficient conditions, cracks appear around the soil and in the test pit walls. During irrigation, water preferentially seeps down through the larger cracks at the perimeter, failing to fully infiltrate the soil, resulting in uneven and insufficient irrigation of the upper soil. Simultaneously, some water vapor also preferentially evaporates through the peripheral cracks, leading to inaccurate evaporation data. Irrigation experiments often simulate changes in the planned wetting layer (the top 40 cm of soil). The preferential seepage or evaporation of water from the peripheral cracks significantly impacts experimental results related to irrigation demand, soil permeability coefficient, and crop transpiration. Therefore, this issue urgently needs to be addressed.

[0004] The above content is only used to help understand the technical solution of this utility model and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a water-stopping device for cracks around the soil in the test pit. This device can seal the cracks between the soil and the wall of the test pit, so that water can seep downward through the soil or evaporate upward. This more scientifically simulates the natural response characteristics of soil moisture, crops and groundwater level during the field precipitation-evaporation process, and improves the accuracy of crop irrigation and drainage tests in the entire test pit.

[0006] To achieve the aforementioned objective, the technical solution of this utility model is implemented as follows: a water-stopping device for cracks around the soil in a test pit, comprising: a test pit, soil, and a water-stopping connecting component; the soil is filled in the test pit; the top of the test pit is open, and crops for irrigation and drainage experiments are planted at the open; one side of the water-stopping connecting component is connected to the inner wall of the test pit, and the other side is connected to the soil in the test pit, and the water-stopping connecting component is used to prevent water from flowing along the gap between the soil and the inner wall of the test pit.

[0007] Preferably, the water-stop connection assembly includes a connecting part and an expansion part; the two sides of the connecting part are respectively connected to the inner wall of the test pit and the soil in the test pit; the expansion part is installed in the connecting part, and after absorbing water, the expansion part expands and squeezes the soil to further compact the gap.

[0008] Preferably, the connecting part includes a fixing plate and a waterstop plate; one side of the fixing plate is connected to the inner wall of the measuring pit, and the other side is connected to one end of the waterstop plate, forming a V-shaped groove; the other end of the waterstop plate is inserted into the soil at an angle upward in the vertical direction.

[0009] Preferably, the included angle between the fixing plate and the waterstop plate of the V-groove is 30-45 degrees.

[0010] Preferably, it also includes connecting bolts; the fixing plate is provided with bolt holes; the inner wall of the measuring pit is provided with a connecting groove; the connecting bolt passes through the bolt holes on the fixing plate and connects with the connecting groove on the inner wall of the measuring pit.

[0011] Preferably, it also includes a rubber pad; the rubber pad is fitted onto the connecting bolt.

[0012] Preferably, the expansion portion includes an expansion waterstop; the expansion waterstop is made of a water-absorbing and expanding material, and the cross-section of the expansion waterstop is a "circular" or "triangular" waterstop. The expansion waterstop fills the bottom of the V-shaped groove and is arranged along the length of the V-shaped groove.

[0013] Preferably, the connecting part is arranged along the circumference of the soil and forms a frame structure.

[0014] Preferably, there are at least two frame structures, which are arranged at equal intervals along the vertical direction of the inner wall of the measuring pit.

[0015] The beneficial effects of this utility model are reflected in:

[0016] (1) The water-stopping device provided by this utility model can seal the cracks between the soil and the wall of the test pit, so that water can seep down through the soil or evaporate upward, and more scientifically simulate the natural response characteristics of soil moisture-crop-groundwater level during the irrigation-evaporation process in the field, thereby improving the accuracy of the crop irrigation and drainage test of the entire test pit.

[0017] (2) The water-stopping device provided by this utility model can not only seal the cracks around the soil by setting a V-shaped groove, but also effectively fill the gaps under the water-stopping plate during the soil subsidence process, avoiding the gaps caused by the subsidence of the soil on the lower surface of the "L-shaped" or "inverted V-shaped" water-stopping plate.

[0018] (3) The water-stopping device provided by this utility model, by setting a V-shaped groove, helps to enhance the stability of the expansion water-stopping strip, making it less prone to displacement. Soil backfilling and settlement will not affect the expansion water-stopping strip, and the soil will press the expansion water-stopping strip tighter and tighter. On the other hand, a small amount of water will be stored inside the V-shaped groove, which helps the expansion water-stopping strip to keep moist and expand, ensuring close contact between the water-stopping groove and the soil, and further enhancing the water-stopping effect of the water-stopping device. Attached Figure Description

[0019] Figure 1 is a structural cross-sectional view of this utility model;

[0020] Figure 2 is a cross-sectional view of the V-groove structure of this utility model;

[0021] Figure 3 is a top view of the frame structure formed by the connecting part of this utility model.

[0022] Explanation of reference numerals in the attached figures:

[0023] A. Crops; 10. Testing pit; 20. Soil; 30. Water-stop connection assembly; 31. Fixing plate; 311. Connecting bolt; 312. Rubber pad; 32. Water-stop plate; 33. Expansion water-stop strip; 40. Sand and gravel filter layer; 50. Water supply and drainage pipe. Detailed Implementation

[0024] 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 a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0025] Example

[0026] Referring to Figures 1-3: This utility model provides a water-stopping device for cracks around the soil in a test pit, comprising: a test pit 10, soil 20, and a water-stopping connecting component 30. Soil 20 fills the test pit 10; the top of the test pit 10 has an opening, and a crop A for irrigation and drainage testing is planted at the opening. One side of the water-stopping connecting component 30 is connected to the inner wall of the test pit 10, and the other side is connected to the soil formed by the soil 20 in the test pit 10. Thus, the water-stopping connecting component 30 can fill the gap between the soil and the inner wall of the test pit 10, preventing water from preferentially seeping down or evaporating along the gap between the soil and the inner wall of the test pit 10.

[0027] The water-stop connection assembly 30 includes a connection part and an expansion part; the two sides of the connection part are respectively connected to the inner wall of the test pit 10 and the soil in the test pit 10; the expansion part is installed in the connection part, and the expansion part expands after absorbing water to squeeze the soil.

[0028] The connecting part includes a fixing plate 31 and a waterstop plate 32; one side of the fixing plate 31 is connected to the inner wall of the measuring pit 10, and the other side is connected to one end of the waterstop plate 32, forming a V-shaped groove. The other end of the waterstop plate 32 is inserted into the soil at an angle upward in the vertical direction. The included angle between the fixing plate 31 and the waterstop plate 32 in the V-shaped groove is 30-45 degrees.

[0029] With this setup, the installation of the fixing plate 31 and the waterstop plate 32 does not affect the vertical movement of water in the soil. The V-groove design not only seals cracks around the soil but also effectively fills the gaps under the waterstop plate 32 during backfilling and settling of the soil 20. This avoids voids or gaps caused by soil settling under the "L-shaped" or "inverted V-shaped" waterstop plates, and helps to enhance the bonding between the connection part and the soil 20.

[0030] In practical use, the materials of fixing plate 31 and waterstop plate 32 both have a certain strength. The structure of the V-shaped groove does not deform during backfilling and compaction of soil 20 and during the experiment. It is not easy to have a physical and chemical reaction with the leachate of soil 20. The materials are generally stainless steel plates or polymer materials.

[0031] The connecting parts can be set along the circumference of the soil and form a frame structure. There are at least two frame structures, which are arranged at equal intervals along the vertical direction of the inner wall of the test pit 10.

[0032] In practical application, the installation height, number of layers, and depth of the waterstop 32 into the soil are determined based on the depth of the testing pit 10 and the expansion and contraction strength of the soil 20. Due to significant differences in moisture content in the upper part of the soil 20, the gaps between its perimeter and the inner wall of the testing pit 10 are mainly concentrated in the upper soil, with a minimum depth of 4m. 2Taking a 2m (area × depth) bottomed concrete test pit 10 and soil 20 as an example of sandy ginger black soil, select 3 connecting parts, respectively 30 cm, 60 cm and 90 cm away from the surface of soil 20.

[0033] It also includes a connecting bolt 311; the fixing plate 31 has bolt holes; the inner wall of the measuring pit 10 has a connecting groove; and a nut with internal threads is provided in the connecting groove. The connecting bolt 311 passes through the bolt holes on the fixing plate 31 and forms a threaded connection with the connecting groove.

[0034] To fabricate the V-groove and bolt holes, taking stainless steel as an example, a 2 mm thick stainless steel plate can be pressed in one piece. The fixing plate 31 and the waterstop plate 32 are each about 5 cm wide on each side, and their length is consistent with the width of the test pit (2 m). Bolt holes are made on the fixing plate 31 at 30 cm intervals. The four sides of the V-groove on the same layer are welded together, and the corners are cut at a 45-degree bevel and welded seamlessly to form a frame structure for subsequent installation.

[0035] It also includes a rubber pad 312; the rubber pad 312 is fitted onto the connecting bolt 311.

[0036] In practical use, drill holes in the rubber pad 312 corresponding to the position of the connecting bolt 311, and fit it onto the connecting bolt 311, then tighten the connecting bolt 311.

[0037] In practical use, the fixing plate 31 is connected to the inner wall of the measuring pit 10 by high-strength adhesives such as structural adhesives or by welding. In this case, the bolt holes on the fixing plate 31, the connecting grooves on the inner wall of the measuring pit 10, the rubber pad 312 and the connecting bolts 311 can all be omitted.

[0038] The expansion section includes an expansion waterstop 33; the expansion waterstop 33 is made of water-absorbing and expanding material, and the cross-section of the expansion waterstop 33 is a "circular" or "triangular" waterstop. The expansion waterstop 33 fills the bottom of the V-shaped groove and is set along the length of the V-shaped groove.

[0039] In practical use, when placing the expansion waterstop 33 in a frame structure, the height of the expansion waterstop 33 is lower than the height of the V-groove. Generally, a circular expansion waterstop 33 with a diameter of 2 cm or a triangular expansion waterstop 33 with a height of 3 cm is selected. It is required that the triangular expansion waterstop 33 be tightly integrated with the V-groove and placed in a circular pattern around the perimeter.

[0040] The bottom of the soil 20 is provided with a sand and gravel filter layer 40 for filtration; the sand and gravel filter layer 40 is provided with a water supply and drainage pipe 50.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water-stopping device for cracks around the soil in a testing pit, comprising: The test pit (10) and soil (20); the soil (20) is filled in the test pit (10); The top of the test pit (10) is open, and crops (A) for irrigation and drainage tests are planted at the open; characterized in that it also includes a water-stopping connection component (30); one side of the water-stopping connection component (30) is connected to the inner wall of the test pit (10), and the other side is connected to the soil body formed by the soil (20) in the test pit (10), and the water-stopping connection component (30) is used to prevent water from flowing along the gap between the soil body and the inner wall of the test pit (10).

2. The water stop device for measuring the circumferential crack of a pit soil body according to claim 1, characterized in that, The water-stop connection assembly (30) includes a connection part and an expansion part; the two sides of the connection part are respectively connected to the inner wall of the test pit (10) and the soil in the test pit (10); the expansion part is installed in the connection part, and the expansion part expands after absorbing water to squeeze the soil.

3. A water-stopping device for cracks around a test pit according to claim 2, characterized in that, The connecting part includes a fixing plate (31) and a waterstop plate (32); one side of the fixing plate (31) is connected to the inner wall of the measuring pit (10), and the other side is connected to one end of the waterstop plate (32) to form a V-shaped groove; the other end of the waterstop plate (32) is inserted into the soil at an angle upward in the vertical direction.

4. A water-stopping device for cracks around a test pit as described in claim 3, characterized in that, The included angle between the fixing plate (31) and the waterstop plate (32) of the V-groove is 30-45 degrees.

5. A water-stopping device for cracks around a test pit soil according to claim 3 or 4, characterized in that, It also includes connecting bolts (311); the fixing plate (31) is provided with bolt holes; the inner wall of the measuring pit (10) is provided with connecting grooves; the connecting bolts (311) pass through the bolt holes on the fixing plate (31) and connect to the connecting grooves on the inner wall of the measuring pit (10).

6. A water-stopping device for cracks around a test pit according to claim 5, characterized in that, It also includes a rubber pad (312); the rubber pad (312) is fitted onto the connecting bolt (311).

7. A water-stopping device for cracks around a test pit according to claim 6, characterized in that, The expansion part includes an expansion waterstop (33); the expansion waterstop (33) is made of water-absorbing and expanding material, the cross section of the expansion waterstop (33) is a "circular" or "triangular" waterstop, the expansion waterstop (33) fills the bottom of the V-shaped groove and is set along the length direction of the V-shaped groove.

8. A water-stopping device for cracks around a test pit according to claim 7, characterized in that, The connecting part is arranged along the circumference of the soil and forms a frame structure.

9. A water-stopping device for cracks around a test pit according to claim 8, characterized in that, There are at least two frame structures, and they are arranged at equal intervals along the vertical direction of the inner wall of the measuring pit (10).

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