Double-ring water injection test device for detecting soil permeability coefficient

Abstract

The utility model discloses a double-ring water injection test device for detecting a soil permeability coefficient. The double-ring water injection test device comprises an inner ring pipe fitting, an outer ring pipe fitting, a bracket, a first water supply bottle and a second water supply bottle, according to the utility model, the first water supply bottle and the second water supply bottle can automatically supply water to the double-ring structure consisting of the inner ring pipe fitting and the outer ring pipe fitting, and the liquid level of clear water in the double-ring structure can be kept at a constant height after the water supply device starts to work and enters a stable state; therefore, the stability and the accuracy of detecting the soil permeability coefficient by using the double-ring water injection test device disclosed by the utility model are ensured; therefore, the device disclosed by the utility model does not need to be supervised by testers on site, has the advantages of high automation degree and low cost, and is suitable for detecting the soil permeability coefficient.

Description

Technical Field

[0001] The utility model relates to a test device for soil permeability coefficient, in particular to a double-ring water injection test device for detecting soil permeability coefficient. Background Art

[0002] Cities can be like sponges, with good "elasticity" in adapting to environmental changes and responding to natural disasters. The internationally accepted term is "low-impact development rainwater system construction". When it rains, it absorbs, stores, infiltrates and purifies water. When needed, the stored water will be released and utilized to achieve the free migration of rainwater in the city.

[0003] When soil is saturated with water, the downward movement of water under the influence of gravity is called permeability. Soil permeability is a key soil property, measuring its ability to retain water and serving as a key indicator for sponge cities. The China Association for Engineering Construction Standardization's "2020 First Batch of Association Standard Development and Revision Plans," Jianbiaoxiezi

[2020] No. 14, mandates the development of a "Standard for Testing Shallow Soil Permeability in Sponge City Construction." The "Highway Subgrade and Pavement Field Testing Procedure" (JTG 3450) and the "Guangdong Province Green Building Testing Standard" (DBJ / T 15-234-2021) both include indicators for the soil permeability coefficient. The soil permeability coefficient refers to the amount of free water in saturated soil that passes through a unit area of ​​soil per unit time under a unit water pressure gradient.

[0004] The existing soil permeability coefficient testing device has the disadvantages of requiring test personnel to supervise on-site and high cost. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a double-ring water injection test device for detecting soil permeability coefficient.

[0006] To solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0007] A double-ring water injection test device for detecting soil permeability coefficient, characterized by comprising: an inner ring pipe, an outer ring pipe, a bracket, a first water supply bottle and a second water supply bottle;

[0008] The inner and outer ring pipes are partially inserted into the soil to be tested in a coaxial manner, the ground of the soil to be tested is evenly paved with a gravel layer located inside the inner and outer ring pipes, and the inner and outer ring pipes are filled with clean water;

[0009] The first water supply bottle and the second water supply bottle are installed above the inner ring pipe and the outer ring pipe through a bracket, and the first water supply bottle and the second water supply bottle are both sealed bottles filled with clean water;

[0010] A first pressure differential control tube and a first water supply tube are installed at the bottom of the first water supply bottle; the upper port of the first pressure differential control tube and the upper port of the first water supply tube are respectively located above the clean water level in the first water supply bottle and at the bottom of the first water supply bottle, and the lower port of the first pressure differential control tube and the lower port of the first water supply tube extend to the clean water level in the inner ring pipe and below the clean water level respectively;

[0011] A second pressure differential control tube and a second water supply tube are installed at the bottom of the second water supply bottle; the upper port of the second pressure differential control tube and the upper port of the second water supply tube are respectively located above the clean water level in the second water supply bottle and at the bottom of the second water supply bottle, and the lower port of the second pressure differential control tube and the lower port of the second water supply tube extend to the clean water level between the inner ring pipe fitting and the outer ring pipe fitting and below the clean water level, respectively;

[0012] Furthermore, the lower port of the first differential pressure control tube and the lower port of the second differential pressure control tube are located on the same horizontal plane.

[0013] Thus, the principle of the present invention is as follows:

[0014] When the clean water liquid level inside the inner ring pipe and between the inner ring pipe and the outer ring pipe is above the lower port of the first pressure differential control pipe and the lower port of the second pressure differential control pipe, due to the action of air pressure, the clean water in the first water supply bottle cannot flow into the inner ring pipe through the first water supply pipe, and the clean water in the second water supply bottle cannot flow into the outer ring pipe through the second water supply pipe, and water injection is stopped.

[0015] As the clean water in the inner and outer ring pipes penetrate downward into the tested soil, the clean water levels in the inner and outer ring pipes drop and become lower than the lower ports of the first and second pressure differential control pipes, external air can enter the first and second water supply bottles through the lower ports of the first and second pressure differential control pipes, respectively, so that the clean water in the first water supply bottle flows into the inner ring pipe through the first water supply pipe, and the clean water in the second water supply bottle flows into the outer ring pipe through the second water supply pipe, thus starting water injection; until the clean water levels in the inner and outer ring pipes and between the inner and outer ring pipes rise above the lower ports of the first and second pressure differential control pipes, water injection is stopped.

[0016] In this way, the first water supply bottle and the second water supply bottle automatically supply water to the double-ring structure composed of the inner ring pipe and the outer ring pipe. After the utility model starts working and enters a stable state, the clean water level in the double-ring structure can maintain a constant height to ensure the stability and accuracy of soil permeability coefficient detection using the double-ring water injection test device of the utility model.

[0017] Specifically, after obtaining data using the double-ring water injection test device of the present invention, the soil permeability coefficient k of the tested soil can be calculated according to the following formula: T :

[0018]

[0019] Where k T is the soil permeability coefficient of the tested soil, in m / s; Q is the amount of water that penetrates from the first water supply bottle into the inner ring pipe during the test, in cm 3 ; t is the test time, unit is s; A h is the cross-sectional area of ​​the inner ring pipe, in cm 2 .

[0020] Preferably, the inner ring pipe fitting and the outer ring pipe fitting are both made of iron.

[0021] Preferably, the thickness of the gravel layer is 2 cm.

[0022] Preferably, the first differential pressure control tube, the first water supply tube, the second differential pressure control tube and the second water supply tube are all glass tubes.

[0023] Preferably, the lower ports of the first differential pressure control pipe, the first water supply pipe, the second differential pressure control pipe and the second water supply pipe are all inclined ports.

[0024] As a preferred embodiment of the present invention, the dual-loop water injection test device further includes a liquid level gauge and a remote terminal. The liquid level gauge is mounted on a bracket and is capable of monitoring the clean water levels in the first and second water supply bottles, respectively. The liquid level gauge is capable of transmitting the monitored clean water level data to the remote terminal for display. This facilitates the remote terminal to convert the clean water level data into the amount of water Q that permeated the inner loop pipe from the first water supply bottle during the test.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] First, the utility model is provided with an inner ring pipe fitting 1, an outer ring pipe fitting 2, a bracket 3, a first water supply bottle 4 and a second water supply bottle 5, which can realize that the first water supply bottle 4 and the second water supply bottle 5 automatically supply water to the double-ring structure composed of the inner ring pipe fitting 1 and the outer ring pipe fitting 2, and after the utility model starts working and enters a stable state, the clean water liquid level in the double-ring structure can maintain a constant height to ensure the stability and accuracy of the soil permeability coefficient detection using the double-ring water injection test device of the utility model; therefore, the utility model device does not need to be supervised on site by test personnel, has the advantages of high degree of automation and low cost, and is suitable for soil permeability coefficient detection.

[0027] Second, the present invention realizes real-time liquid level monitoring of the clean water in the first water supply bottle 4 and the second water supply bottle 5 by adding a liquid level meter 8 and a remote terminal, without the need for test personnel to observe the readings, thereby reducing errors and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] Figure 1 It is a structural schematic diagram of the double-ring water injection test device of the present utility model. DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with the embodiments and the accompanying drawings to help those skilled in the art better understand the utility model concept of the present invention. However, the scope of protection of the claims of the present invention is not limited to the following embodiments. For those skilled in the art, all other embodiments obtained without creative work without departing from the utility model concept of the present invention shall fall within the scope of protection of the present invention.

[0031] like Figure 1 As shown, the utility model discloses a double-ring water injection test device for detecting soil permeability coefficient, comprising: an inner ring pipe 1, an outer ring pipe 2, a bracket 3, a first water supply bottle 4 and a second water supply bottle 5;

[0032] The inner ring pipe 1 and the outer ring pipe 2 are partially inserted into the soil 6 to be tested in a coaxial manner. The ground of the soil 6 to be tested is evenly paved with a gravel layer 7 located inside the inner ring pipe 1 and the outer ring pipe 2, and the inner ring pipe 1 and the outer ring pipe 2 are filled with clean water.

[0033] The first water supply bottle 4 and the second water supply bottle 5 are installed above the inner ring pipe 1 and the outer ring pipe 2 through the bracket 3, and the first water supply bottle 4 and the second water supply bottle 5 are sealed bottles filled with clean water;

[0034] A first pressure differential control tube 4-1 and a first water supply tube 4-2 are installed at the bottom of the first water supply bottle 4; the upper end of the first pressure differential control tube 4-1 and the upper end of the first water supply tube 4-2 are respectively located above the clean water level in the first water supply bottle 4 and at the bottom of the first water supply bottle 4, and the lower end of the first pressure differential control tube 4-1 and the lower end of the first water supply tube 4-2 extend to the clean water level in the inner ring pipe 1 and below the clean water level;

[0035] A second pressure differential control tube 5-1 and a second water supply tube 5-2 are installed at the bottom of the second water supply bottle 5; the upper end of the second pressure differential control tube 5-1 and the upper end of the second water supply tube 5-2 are respectively located above the clean water level in the second water supply bottle 5 and at the bottom of the second water supply bottle 5, and the lower end of the second pressure differential control tube 5-1 and the lower end of the second water supply tube 5-2 extend to the clean water level between the inner ring pipe 1 and the outer ring pipe 2 and below the clean water level, respectively;

[0036] Furthermore, the lower port of the first differential pressure control tube 4 - 1 and the lower port of the second differential pressure control tube 5 - 1 are located on the same horizontal plane.

[0037] Thus, the principle of the present invention is as follows:

[0038] When the clean water liquid level inside the inner ring pipe 1 and between the inner ring pipe 1 and the outer ring pipe 2 is above the lower port of the first pressure difference control tube 4-1 and the lower port of the second pressure difference control tube 5-1, due to the action of air pressure, the clean water in the first water supply bottle 4 cannot flow into the inner ring pipe 1 through the first water supply pipe 4-2, and the clean water in the second water supply bottle 5 cannot flow into the outer ring pipe 2 through the second water supply pipe 5-2, and water injection is stopped.

[0039] As the clean water in the inner ring pipe 1 and the outer ring pipe 2 penetrates downward into the tested soil 6, the clean water levels in the inner ring pipe 1 and the outer ring pipe 2 drop and become lower than the lower end of the first pressure differential control tube 4-1 and the lower end of the second pressure differential control tube 5-1. Then, outside air can enter the first water supply bottle 4 and the second water supply bottle 5 through the lower end of the first pressure differential control tube 4-1 and the lower end of the second pressure differential control tube 5-1, respectively, so that the clean water in the first water supply bottle 4 flows into the inner ring pipe 1 through the first water supply pipe 4-2, and the clean water in the second water supply bottle 5 flows into the outer ring pipe 2 through the second water supply pipe 5-2, i.e., water injection starts; until the clean water levels in the inner ring pipe 1 and between the inner ring pipe 1 and the outer ring pipe 2 rise above the lower end of the first pressure differential control tube 4-1 and the lower end of the second pressure differential control tube 5-1, water injection is stopped.

[0040] In this way, the first water supply bottle 4 and the second water supply bottle 5 automatically supply water to the double-ring structure composed of the inner ring pipe 1 and the outer ring pipe 2. After the utility model starts working and enters a stable state, the clean water level in the double-ring structure can maintain a constant height to ensure the stability and accuracy of soil permeability coefficient detection using the double-ring water injection test device of the utility model.

[0041] Specifically, after obtaining data using the double-ring water injection test device of the present invention, the soil permeability coefficient k of the tested soil 6 can be calculated according to the following formula: T :

[0042]

[0043] Where k T is the soil permeability coefficient of the tested soil 6, in m / s; Q is the amount of water that penetrates from the first water supply bottle 4 into the inner ring pipe 1 during the test, in cm 3 ; t is the test time, unit is s; A h is the cross-sectional area of ​​the inner ring pipe 1, in cm 2 .

[0044] The above is a basic implementation of the present invention, and further optimization, improvement and limitation can be made based on the basic implementation:

[0045] Preferably, the inner ring pipe fitting 1 and the outer ring pipe fitting 2 are both made of iron.

[0046] Preferably, the thickness of the gravel layer 7 is 2 cm.

[0047] Preferably, the first differential pressure control tube 4-1, the first water supply tube 4-2, the second differential pressure control tube 5-1 and the second water supply tube 5-2 are all glass tubes.

[0048] Preferably, the lower ports of the first differential pressure control pipe 4-1, the first water supply pipe 4-2, the second differential pressure control pipe 5-1 and the second water supply pipe 5-2 are all inclined ports.

[0049] As a preferred embodiment of the present invention, the dual-loop water injection test apparatus further includes a liquid level gauge 8 and a remote terminal. The liquid level gauge 8 is mounted on the bracket 3 and is capable of monitoring the clean water levels in the first and second water supply bottles 4, 5, respectively. The liquid level gauge 8 is capable of transmitting the monitored clean water level data to the remote terminal for display. This facilitates the remote terminal to convert the clean water level data into the amount of water Q that permeated the inner loop pipe 1 from the first water supply bottle 4 during the test.

[0050] The present invention is not limited to the above-mentioned specific implementation methods. According to the above content, in accordance with the common technical knowledge and customary means in this field, without departing from the above-mentioned basic technical ideas of the present invention, the present invention can also make other various forms of equivalent modifications, replacements or changes, all of which fall within the scope of protection of the present invention.

Claims

1. A double-ring water injection test device for soil permeability coefficient detection, characterized in that: include: An inner ring pipe (1), an outer ring pipe (2), a bracket (3), a first water supply bottle (4), and a second water supply bottle (5); The inner ring pipe (1) and the outer ring pipe (2) are partially inserted into the soil to be tested (6) in a coaxial manner, the ground of the soil to be tested (6) is evenly paved with a gravel layer (7) located inside the inner ring pipe (1) and the outer ring pipe (2), and the inner ring pipe (1) and the outer ring pipe (2) are filled with clean water; The first water supply bottle (4) and the second water supply bottle (5) are installed above the inner ring pipe (1) and the outer ring pipe (2) via a bracket (3), and both the first water supply bottle (4) and the second water supply bottle (5) are sealed bottles filled with clean water. A first pressure difference control tube (4-1) and a first water supply tube (4-2) are installed at the bottom of the first water supply bottle (4); the upper end of the first pressure difference control tube (4-1) and the upper end of the first water supply tube (4-2) are respectively located above the clean water level in the first water supply bottle (4) and at the bottom of the first water supply bottle (4); the lower end of the first pressure difference control tube (4-1) and the lower end of the first water supply tube (4-2) extend to the clean water level in the inner ring pipe (1) and below the clean water level; A second pressure differential control tube (5-1) and a second water supply tube (5-2) are installed at the bottom of the second water supply bottle (5); the upper end of the second pressure differential control tube (5-1) and the upper end of the second water supply tube (5-2) are respectively located above the clean water level in the second water supply bottle (5) and at the bottom of the second water supply bottle (5); the lower end of the second pressure differential control tube (5-1) and the lower end of the second water supply tube (5-2) extend to the clean water level between the inner ring pipe (1) and the outer ring pipe (2) and below the clean water level, respectively; Furthermore, the lower port of the first differential pressure control tube (4-1) and the lower port of the second differential pressure control tube (5-1) are located on the same horizontal plane.

2. The double-ring water injection test device for soil permeability coefficient detection according to claim 1, characterized in that: The inner ring pipe fitting (1) and the outer ring pipe fitting (2) are both made of iron.

3. The double-ring water injection test device for soil permeability coefficient detection according to claim 1, characterized in that: The thickness of the gravel layer (7) is 2 cm.

4. The double-ring water injection test device for soil permeability coefficient detection according to claim 1, characterized in that: The first differential pressure control tube (4-1), the first water supply tube (4-2), the second differential pressure control tube (5-1) and the second water supply tube (5-2) are all glass tubes.

5. The double-ring water injection test device for soil permeability coefficient detection according to claim 1, characterized in that: The lower ports of the first differential pressure control pipe (4-1), the first water supply pipe (4-2), the second differential pressure control pipe (5-1) and the second water supply pipe (5-2) are all inclined ports.

6. The double-ring water injection test device for soil permeability coefficient detection according to any one of claims 1 to 5, characterized in that: The double-ring water injection test device further comprises a liquid level meter (8) and a remote terminal. The liquid level meter (8) is mounted on the bracket (3) and is capable of monitoring the clean water levels in the first water supply bottle (4) and the second water supply bottle (5), respectively. The liquid level meter (8) is capable of sending the monitored clean water level data to the remote terminal for display.

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