Novel double-ring water seepage test device

Abstract

The utility model discloses a novel double-ring water seepage test device which comprises a water bucket, a first water valve, a second water valve, a water meter, a first polyvinyl chloride (PVC) water pipe, a second PVC water pipe, a first stainless steel corrugated pipe, a second stainless steel corrugated pipe, a first floating ball valve, a second floating ball valve, an inner ring, an outer ring, a first floating ball valve fixing frame and a second floating ball valve. The inner ring is provided with a first floating ball valve, the outer ring is provided with a second floating ball valve, the lower part of the water bucket is provided with a first water outlet and a second water outlet which are respectively connected with the water injection pipelines of the inner ring and the outer ring, and the Mariotte water supply device has the advantages of eliminating the influence of manual water supply on the water level in the ring when the Mariotte bottle is lack of water, and improving the precision of measuring the permeability coefficient.

Description

Technical Field

[0001] The utility model relates to the technical field of water seepage testing, in particular to a novel double-ring water seepage testing device. Background Art

[0002] The double-ring water seepage test is a commonly used method for directly measuring the permeability coefficient of rock and soil in the field. In this experiment, the water seeping between the inner and outer rings is mainly lateral diffusion and capillary absorption, while the water seeping into the inner ring is the actual vertical penetration between the loose layer and the rock layer, eliminating the error of the lateral seepage zone. Therefore, the double-ring water seepage test is more accurate than other field water seepage tests.

[0003] The existing double-ring method of double-ring water seepage test equipment generally has two iron rings embedded in the bottom of the test pit. The outer ring diameter is 0.5m and the inner ring diameter is 0.25m. Two Mariotte bottles are fixed above the inner and outer rings using a bracket composed of a tray and a support rod. The Mariotte bottle is a plastic bottle with a sealed upper end and a water outlet at the lower end.

[0004] In addition to the double ring, the above test device requires the tester to have a tray, a support rod combination bracket, two Mariotte bottles, etc., and many test instruments need to be operated and observed. In the early stage of the test, the water infiltration speed in the double ring is fast, and the water volume in the two Mariotte bottles cannot meet the infiltration water volume, so manual water replenishment is required in time. According to the test specifications, the time interval for recording the water injection volume in the initial stage is 5 minutes. The time interval is short, which means that in a short period of time, manual consideration must be given to multiple test instruments and observation and recording must be made, which can easily cause problems such as unstable water level control and inaccurate test observations. Therefore, the automation level of water depth control of the existing double ring method should be improved.

[0005] Based on the above reasons, this design proposes a new double-ring water seepage test device. Summary of the Invention

[0006] The utility model aims to provide a novel double-ring water seepage test device, which aims to eliminate the influence of artificial water replenishment on the water level in the ring when there is a lack of water in the Mariotte bottle, and improve the accuracy of measuring the permeability coefficient.

[0007] To achieve the above-mentioned purpose, the utility model is realized through such a technical solution, a novel double-ring water seepage test device, including a water bucket, a first water valve, a second water valve, a water meter, a first PVC water pipe, a second PVC water pipe, a first stainless steel bellows, a second stainless steel bellows, a first float valve, a second float valve, an inner ring, an outer ring, a first float valve fixing bracket, and a second float valve. The first float valve is arranged on the inner ring, and the second float valve is arranged on the outer ring. The lower part of the water bucket is provided with a first water outlet and a second water outlet and is respectively connected to the water injection pipelines of the inner ring and the outer ring.

[0008] Furthermore, the first water outlet of the inner ring's water injection pipeline is connected to the first water valve in sequence, the first water valve is connected to the water meter, the water meter is connected to the PVC water pipe, the rear end of the PVC water pipe is connected to a stainless steel bellows, the rear end of the stainless steel bellows is connected to a first float valve, and the first float valve is fixed to the inner ring wall through the first float valve fixing bracket.

[0009] Furthermore, the second water outlet of the outer ring's water injection pipeline is connected to the second water valve in sequence, the second water valve is connected to the second PVC water pipe, the rear end of the second PVC water pipe is connected to the stainless steel bellows, the rear end of the stainless steel bellows is connected to the second float valve, and the second float valve is fixed to the outer ring wall through a second float valve fixing bracket.

[0010] 1. The utility model uses a bucket to supply water and a float valve to automatically control the water level, thus avoiding the instability of the water level in the ring caused by untimely manual water replenishment;

[0011] 2. The utility model can add water to the bucket at any time, ensuring that the test device does not need to be moved during the test process, thereby increasing the test accuracy;

[0012] 3. This device adds a float valve at the water outlet to control the water column inside the inner and outer rings to maintain the same scale, eliminating the need for manual observation of the water depth and reducing the workload of the test personnel during the test;

[0013] 4. The utility model is equipped with a water meter, which makes it easy to observe and read the flow rate, that is, the value of Q is more accurate and the permeability coefficient K is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the main structure of the utility model.

[0015] In the figure: 1. Water bucket; 2. First water outlet; 3. First water valve; 4. Water meter; 5. First PVC water pipe; 6. First stainless steel bellows; 7. First float valve; 8. Inner ring; 9. Outer ring; 10. First float valve fixing bracket; 11. Water level in bucket; 12. Second water outlet; 13. Second water valve; 14. Second PVC water pipe; 15. Second stainless steel bellows; 16. Second float valve; 17. Second float fixing bracket. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited thereto. Example

[0017] like Figure 1As shown, a new double-ring water seepage test device includes a water bucket 1, a first water valve 3 and a second water valve 13, a water meter 4, a first PVC water pipe 5 and a second PVC water pipe 14, a first stainless steel corrugated pipe 6 and a second stainless steel threaded pipe 15, a first float valve 7 and a second float valve 16, an inner ring 8, an outer ring 9, a first float valve fixing bracket 10 and a second float valve fixing bracket 17. The two of the same items are of the same model.

[0018] The inner ring 8 houses a first float valve 7, while the outer ring 9 houses a second float valve 16. Both valves are designed for top-quarter water inlet. The float valve operates by moving the valve disc as a float (usually a hollow ball) rises or falls within the valve. When the liquid level falls below a specified value, the float descends, opening the disc and allowing liquid to flow into the container, raising the liquid level. When the liquid level reaches a specified level, the float rises, closing the disc and stopping the flow of liquid, maintaining a constant level in the container.

[0019] Among them, the first water outlet 2 and the second water outlet 12 are set at the lower part of the barrel body of the bucket 1, which are respectively connected to the water injection pipelines of the inner ring 8 and the outer ring 9.

[0020] Among them, the first water outlet 2 of the water injection pipeline of the inner ring 8 is first connected to the water valve 3, then connected to the water meter 4, and then connected to the first PVC water pipe 5, then connected to the first stainless steel bellows 6, and finally connected to the first float valve 7. The first float valve 7 is fixed on the ring wall of the inner ring 8 through the first float valve fixing bracket 10.

[0021] Among them, water meter 4 adopts a universal DN15 (four-point) cold water meter with a minimum reading of 0.00005m³ and can be estimated to 0.00001m³.

[0022] Among them, the second water outlet 12 of the water injection pipeline of the outer ring 9 is first connected to the second water valve 13, then connected to the second PVC water pipe 14, and then connected to the second stainless steel bellows 15, and finally connected to the second float valve 16. The second float valve 16 is fixed on the ring wall of the outer ring 9 through the second float valve fixing bracket 17.

[0023] Among them, the inner ring 8 has a diameter of 0.25m, the outer ring 9 has a diameter of 0.5m, and the heights are consistent, both 25cm.

[0024] During use, assemble the upper components, excluding the inner and outer rings 8 and 9, as described above. First, excavate a test pit at the test site. Place the inner and outer rings 8 and 9 within the pit, ensuring their centers are aligned as closely as possible. Press the bottoms of the inner and outer rings 8 and 9 into the pit to a depth of approximately 5-8 cm, ensuring the soil structure is undisturbed and that the test rings are watertight. Use a ruler to measure the bottoms of the inner and outer rings 8 and 9 10 cm above the original soil layer and mark the ring walls. Lay a 2-3 cm thick layer of 5-10 mm gravel or crushed stone on the bottom of the rings between the inner and outer rings 8 and 9 as a buffer layer. Then the first float valve 7 and the second float valve 16 are fixed near the positions of the corresponding ring wall marks by the first float valve fixing bracket 10 and the second float valve fixing bracket 17, and ensure that the water stop positions of the first float valve 7 and the second float valve 16 are at the same level as the positions of the corresponding ring wall marks. After the bucket 1 is filled with water, the water level 11 in the bucket should be ensured to be higher than the first water outlet 2 and the second water outlet 12 by a certain height during the test. At the same time, the switches of the first water valve 3 and the second water valve 13 are opened, and water is injected into the ring at the same time. When the water depth in the inner ring 8 and the outer ring 9 reaches 10 cm, that is, reaches the water stop position of the first float valve 7 and the second float valve 16, the first float valve 7 and the second float valve 16 are automatically closed, and water injection is suspended; as the water seeps into the soil layer, the water depth in the ring decreases, and the first float valve 7 and the second float valve 16 are automatically opened to inject water. This process keeps the water depth in the ring stable.

[0025] The amount of water injected into the inner ring is read by combining the numbers and pointers on the dial of water meter 4. Before the test begins, read the original value of the water meter. After the test begins, read it every 5 minutes for 5 consecutive times; then read it every 15 minutes for 2 consecutive times; and then read it every 30 minutes for at least 6 times. When the difference between the injection flow rates read twice in a row is no more than 10% of the last injection flow rate, the test can be ended. Take the last injection flow rate as the stable infiltration flow rate Q and the inner ring water depth Z. Then calculate the permeability coefficient according to the following formula:

[0026]

[0027] Where, K is the permeability coefficient of the test soil layer (cm / min);

[0028] Q—stable infiltration flow rate (cm³ / min); under dry and hot conditions, the amount of evaporated water should be deducted;

[0029] L—The penetration depth (cm) measured from the original soil layer at the bottom of the test pit at the end of the test. It can be determined by excavation after the test is completed;

[0030] F—bottom area of ​​inner ring 8 (cm²);

[0031] HK—capillary pressure head (cm), which can be referred to the empirical value (or recommended value);

[0032] Z—Inner ring water depth (cm), which is 10cm.

[0033] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A new double-ring water seepage test device, characterized by: The invention comprises a water bucket (1), a first water valve (3), a second water valve (13), a water meter (4), a first PVC water pipe (5), a second PVC water pipe (14), a first stainless steel bellows (6), a second stainless steel bellows (15), a first float valve (7), a second float valve (16), an inner ring (8), an outer ring (9), a first float valve fixing frame (10), and a second float valve (17). The first float valve (7) is provided on the inner ring (8), and the second float valve (16) is provided on the outer ring (9). The lower part of the water bucket (1) is provided with a first water outlet (2) and a second water outlet (12), which are respectively connected to the water injection pipelines of the inner ring (8) and the outer ring (9).

2. A novel double-ring water seepage test device according to claim 1, characterized in that: The first water outlet (2) of the water injection pipeline of the inner ring (8) is connected in sequence to the first water valve (3), the first water valve (3) is connected to the water meter (4), the water meter (4) is connected to the PVC water pipe (5), the rear end of the PVC water pipe (5) is connected to the stainless steel bellows (6), the rear end of the stainless steel bellows (6) is connected to the first float valve (7), and the first float valve (7) is fixed to the ring wall of the inner ring (8) through the first float valve fixing bracket (10).

3. A novel double-ring water seepage test device according to claim 1, characterized in that: The second water outlet (12) of the water injection pipeline of the outer ring (9) is connected in sequence to the second water valve (13), the second water valve (13) is connected to the second PVC water pipe (14), the rear end of the second PVC water pipe (14) is connected to the stainless steel bellows (15), the rear end of the stainless steel bellows (15) is connected to the second float valve (16), and the second float valve (16) is fixed to the ring wall of the outer ring (9) through the second float valve fixing bracket (17).

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