Device for testing permeability coefficient of modified bentonite anti-seepage material

Abstract

The utility model provides a permeability coefficient testing device for a modified bentonite impermeable material, which is characterized in that one side of a base is provided with a vertical column, the upper end of the vertical column is provided with a mounting station extending to the middle of the base, the middle of a bottom table is provided with an assembling groove, a lower permeable stone is supported in the assembling groove through a step table, and the bottom of the assembling groove is provided with a bowl-shaped liquid collecting groove corresponding to the lower permeable stone; a liquid outlet corresponding to the liquid collecting tank is formed in the middle of the bottom table; the liquid containing cylinder is matched with an opening of the assembling groove, the lower end of the liquid containing cylinder abuts against the upper surface of the lower permeable stone, an upper permeable stone located above the lower permeable stone is arranged in the liquid containing cylinder, and the upper permeable stone is matched with an inner cavity of the liquid containing cylinder; one end of the extrusion rod is connected with the mounting station, and the other end of the extrusion rod is correspondingly connected with the pressure plate of a hollow structure. The lower penetrating fluid is collected through the bowl-shaped liquid collecting tank, and the penetrating performance of the upper penetrating fluid is ensured through the hollowed-out pressure plate, so that the accurate testing of the penetrating performance is ensured, and the evaluation accuracy of the anti-seepage performance is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bentonite material testing, and particularly relates to a device for testing the permeability coefficient of a modified bentonite anti-seepage material. Background Art

[0002] With the continuous acceleration of the urbanization process in China, the pollution degree of urban industrial sites is also intensifying, and the environmental pollution problems caused by industrial production are attracting more and more attention. In terms of preventing the expansion of the underground pollution range, soil and bentonite vertical isolation walls are structures widely used to block the horizontal migration of groundwater and pollutants. The wall material of the isolation wall is a mixture of bentonite slurry, in-situ soil and bentonite dry powder, which has the characteristics of high water content and low strength.

[0003] The function of the isolation wall is to block the migration of groundwater and pollutants, so the wall is required to have good water impermeability. In practice, the permeability coefficient is a main evaluation index for the blocking performance of the isolation wall. Existing permeability coefficient tests are generally carried out through permeable stones. Through the extrusion of the piston disc, perforations are provided in the middle or side of the piston disc to achieve penetration. There are problems that the permeate of the permeable stone is difficult to collect, and the permeable stone and the extrusion part piston disc are too large, resulting in inaccurate evaluation of the anti-seepage performance of the isolation wall material.

[0004] Therefore, an improved technical solution is needed to address the above deficiencies in the prior art. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the above deficiencies in the prior art, and the utility model provides a device for testing the permeability coefficient of a modified bentonite anti-seepage material.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A device for testing the permeability coefficient of a modified bentonite anti-seepage material, comprising:

[0008] A base, one side of the base is provided with a column, and the upper end of the column is provided with an installation station extending towards the middle of the base;

[0009] A bottom table, the middle of the bottom table is provided with an assembly groove, the inside of the assembly groove supports a lower permeable stone through a stepped platform, a bowl-shaped liquid collecting groove corresponding to the lower permeable stone is provided at the bottom of the assembly groove, and a liquid outlet corresponding to the liquid collecting groove is provided in the middle of the bottom table;

[0010] A liquid holding cylinder, the liquid holding cylinder is adapted to the opening of the assembly groove, the lower end of the liquid holding cylinder abuts against the upper surface of the lower permeable stone, and an upper permeable stone located above the lower permeable stone is arranged in the liquid holding cylinder, and the upper permeable stone is adapted to the inner cavity of the liquid holding cylinder;

[0011] The extrusion rod, one end of the extrusion rod is connected to the installation station, and the other end is correspondingly connected to the pressure plate, and the pressure plate is a hollow structure.

[0012] Preferably, the pressure plate is fixedly connected to the upper permeable stone, and a liquid receiving cover corresponding to the pressure plate is provided on the extrusion rod, and the liquid receiving cylinder is flipped to collect the permeate above the upper permeable stone.

[0013] Preferably, the main body of the pressure plate is an annular member corresponding to the liquid receiving cylinder, and the inside of the pressure plate is connected to the extrusion rod through a plurality of spokes.

[0014] Preferably, the lower part of the upper permeable stone is correspondingly connected to the end of the extrusion rod through bolts.

[0015] Preferably, sealing rings are provided between the pressure plate and the liquid receiving cylinder, and between the pressure plate and the upper permeable stone.

[0016] Preferably, a pressing member is slidably assembled on the column, an arc-shaped member corresponding to the end of the liquid receiving cylinder is provided on one side of the pressing member corresponding to the liquid receiving cylinder, and a pressing nut located above the pressing member is threadedly assembled on the column to longitudinally press the liquid receiving cylinder.

[0017] Preferably, a sealing ring is provided between the liquid receiving cylinder and the lower permeable stone.

[0018] Preferably, a notch corresponding to the liquid outlet is provided in the middle of the base, and a measuring cup corresponding to the liquid outlet is provided below the base.

[0019] Preferably, the extrusion rod is a hydraulic cylinder, a bit is provided at the piston end of the extrusion rod, the bit is connected to an extension rod in a detachable manner, and the extension rod is correspondingly fixed on the pressure plate.

[0020] Advantageous effects: The permeate below is collected through the bowl-shaped liquid collecting groove, and the permeate above ensures the permeation performance through the hollow pressure plate, so as to ensure the accurate test of the permeation performance and improve the accuracy of the anti-seepage performance evaluation. Description of the Drawings

[0021] The schematic diagrams in the specification accompanying this application, which form a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0022] Figure 1 It is a structural schematic diagram of the testing device in the specific embodiment provided by the present invention.

[0023] In the figure: 1, base; 2, column; 3, pressing piece; 4, arc piece; 5, installation station; 6, extrusion rod; 7, liquid storage cylinder; 8, liquid storage cover; 9, pressing disc; 10, upper water-permeable stone; 11, assembly groove; 12, measuring cup; 13, extension rod. Detailed implementation manners

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0025] In the description of the present invention, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "connected" and "coupled" used in the present invention should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] The present invention will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0027] As Figure 1As shown in the figure, a permeability coefficient testing device for a modified bentonite impermeable material includes a base 1, a bottom platform, a liquid storage cylinder 7, and a pressing rod 6. The base 1 is a square metal plate with feet at the bottom. On one side of the base 1, there is a column 2, which is a metal column and is fixed by welding. At the upper end of the column 2, there is an installation station 5 extending towards the middle of the base 1. The installation station 5 can be made of metal profiles or metal frames. In the middle of the bottom platform, there is an assembly groove 11, which is a metal column and can be placed or welded and fixed on the base 1. Inside the assembly groove 11, there is a columnar groove, and a lower permeable stone is supported by a stepped platform in the middle. The upper and lower permeable stones can be stone slabs, concrete, etc., and are prefabricated into a disc shape. At the bottom of the assembly groove 11, there is a bowl-shaped liquid collecting groove corresponding to the lower permeable stone. The outer diameter of the liquid collecting groove is adapted to the inner diameter of the stepped platform, so that the permeation position of the lower permeable stone will not be squeezed by the assembly groove 11, ensuring normal liquid permeation at the permeation position. In the middle of the bottom platform, there is an outlet corresponding to the liquid collecting groove, which can conduct the collected permeated liquid downward. In this embodiment, there is a notch corresponding to the outlet in the middle of the base 1, and the notch is larger than the diameter of the outlet. A measuring cup 12 corresponding to the outlet is provided below the base 1. Further, a frustum is provided at the bottom of the assembly groove 11 and is concentrically distributed with the outlet, and the frustum is adapted to the diameter of the notch, thus ensuring the stability of the assembly groove 11.

[0028] The liquid storage cylinder 7 is a metal cylinder, and the liquid storage cylinder 7 is adapted to the opening of the assembly groove 11. The lower end of the liquid storage cylinder 7 abuts against the upper surface of the lower permeable stone and is sealed by squeezing with the lower permeable stone. And to ensure the sealing performance, a sealing ring corresponding to the inner wall of the assembly groove 11 is provided at the lower end of the liquid storage cylinder 7. Inside the liquid storage cylinder 7, there is an upper permeable stone 10 above the lower permeable stone. The upper permeable stone 10 is adapted to the inner cavity of the liquid storage cylinder 7, so that it can move longitudinally as a piston inside the liquid storage cylinder 7. Further, a ring groove is provided on the outer diameter of the upper permeable stone 10, and a rubber sealing ring corresponding to the liquid storage cylinder 7 is provided in the ring groove. One end of the pressing rod 6 is connected to the installation station 5, and the other end is correspondingly connected to a pressure plate 9. The pressure plate 9 is a hollow structure, and the contact area with the upper permeable stone 10 is reduced through the hollow structure, thus ensuring normal liquid permeation of the upper permeable stone 10.

[0029] In an alternative embodiment, the pressure plate 9 is fixedly connected to the upper permeable stone 10, specifically, it can be connected by gluing or bolts. A liquid storage cover 8 corresponding to the pressure plate 9 is provided on the pressing rod 6, and the liquid storage cylinder 7 is flipped to collect the permeated liquid above the upper permeable stone 10.

[0030] In an alternative embodiment, the extrusion rod 6 is a hydraulic cylinder. There is a material of high water content soil and bentonite between the upper permeable stone 10 and the lower permeable stone, specifically referring to the material with a water content of 0.8 - 1.3 times the liquid limit formed after mixing soil and bentonite. In this way, extrusion can be carried out to simulate the underground pressure with bentonite extrusion. The piston end of the extrusion rod 6 is provided with a bit, and the bit is connected with an extension rod 13 in a detachable manner, so that disassembly can be achieved, and thus it is convenient to turn over the liquid storage cylinder 7, the liquid storage cover 8, the pressure plate 9, etc. together. After inversion, the liquid storage cylinder 7 is removed, so that the seepage flows towards the liquid storage cover 8, and the extension rod 13 is correspondingly fixed on the pressure plate 9.

[0031] The liquid storage cover 8 is bowl-shaped and is adapted to the diameter of the pressure plate 9. A corresponding perforation for the extension rod 13 is provided in the middle of the liquid storage cover 8 for sealing, so as to ensure that the permeate does not flow out or the bentonite slurry does not infiltrate during the turning process. Further, a sealing strip is provided on the contact surface between the pressure plate 9 and the liquid storage cover 8.

[0032] In an alternative embodiment, the main body of the pressure plate 9 is an annular part corresponding to the liquid storage cylinder 7. The inside of the pressure plate 9 is connected to the extrusion rod 6 through a plurality of spokes. A plurality of (preferably 4 - 6) spokes converge in the middle and are fixed on the extension rod 13. A sealing ring corresponding to the liquid storage cylinder 7 is provided on the outer wall of the pressure plate 9.

[0033] A perforation is provided in the middle of the upper permeable stone 10, so that a bolt passes through the upper permeable stone 10 from bottom to top and is threadedly connected to the end of the extrusion rod 6 (extension rod 13) to achieve fixation. Further, sealing rings are provided between the pressure plate 9 and the liquid storage cylinder 7, and between the pressure plate 9 and the upper permeable stone 10.

[0034] In an alternative embodiment, a pressing part 3 is slidably assembled on the column 2. The pressing part 3 is used to apply an extrusion force to the liquid storage cylinder 7 to ensure the sealing between the liquid storage cylinder 7 and the lower permeable stone. On one side of the pressing part 3 corresponding to the liquid storage cylinder 7, there is an arc-shaped part 4 corresponding to the end of the liquid storage cylinder 7. The angle of the arc-shaped part 4 is 180°, so as to squeeze the end of the liquid storage cylinder 7. The inner side of the arc-shaped part 4 does not extend into the inside of the liquid storage cylinder 7, so as to ensure that the pressure plate 9 and the upper permeable stone 10 can smoothly extend into the liquid storage cylinder 7 after adding the bentonite liquid. A pressing nut is threadedly assembled on the column 2 above the pressing part 3 to squeeze the liquid storage cylinder 7 longitudinally. A sealing ring is provided between the liquid storage cylinder 7 and the lower permeable stone.

[0035] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A testing device for the permeability coefficient of a modified bentonite anti-seepage material, characterized in that, Comprising: A base, on one side of which there is a column, and at the upper end of the column there is an installation station extending towards the middle of the base; A bottom table, in the middle of which there is an assembly groove, inside the assembly groove there is a lower permeable stone supported by a stepped platform, at the bottom of the assembly groove there is a bowl-shaped liquid collecting groove corresponding to the lower permeable stone, and in the middle of the bottom table there is a liquid outlet corresponding to the liquid collecting groove; A liquid holding cylinder, which is adapted to the opening of the assembly groove, the lower end of the liquid holding cylinder abuts on the upper surface of the lower permeable stone, and inside the liquid holding cylinder there is an upper permeable stone located above the lower permeable stone, and the upper permeable stone is adapted to the inner cavity of the liquid holding cylinder; A pressing rod, one end of which is connected to the installation station and the other end is correspondingly connected to a pressing plate, and the pressing plate is a hollow structure.

2. The permeability coefficient testing device for the modified bentonite impervious material according to claim 1, characterized in that, The pressing plate is fixedly connected to the upper permeable stone, and on the pressing rod there is a liquid holding cover corresponding to the pressing plate, and the liquid holding cylinder is flipped to collect the permeate above the upper permeable stone.

3. The permeability coefficient testing device for the modified bentonite impervious material according to claim 2, wherein The main body of the pressing plate is an annular part corresponding to the liquid holding cylinder, and the inside of the pressing plate is connected to the pressing rod through a plurality of spokes.

4. The permeability coefficient testing device for the modified bentonite impervious material according to claim 3, wherein, The lower part of the upper permeable stone is correspondingly connected to the end of the pressing rod through a bolt.

5. The permeability coefficient testing device for the modified bentonite impermeable material according to claim 3, characterized in that, Sealing rings are provided between the pressing plate and the liquid holding cylinder, and between the pressing plate and the upper permeable stone.

6. The permeability coefficient testing device for the modified bentonite impervious material according to claim 1, characterized in that, A pressing part is slidably assembled on the column, on one side of the pressing part corresponding to the liquid holding cylinder there is an arc-shaped part corresponding to the end of the liquid holding cylinder, and on the column there is a pressing nut threaded above the pressing part to longitudinally press the liquid holding cylinder.

7. The permeability coefficient testing device for the modified bentonite impermeable material according to claim 6, characterized in that, A sealing ring is provided between the liquid holding cylinder and the lower permeable stone.

8. The permeability coefficient testing device for the modified bentonite impervious material according to claim 1, characterized in that There is a notch corresponding to the liquid outlet in the middle of the base, and a measuring cup corresponding to the liquid outlet is provided below the base.

9. The permeability coefficient testing device for the modified bentonite impervious material according to claim 1, characterized in that, The pressing rod is a hydraulic cylinder, the piston end of the pressing rod is provided with a bit head, the bit head is connected to an extension rod in a detachable manner, and the extension rod is correspondingly fixed on the pressing plate.

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