A test device for detecting leakage of geomembrane in situ

Abstract

The utility model discloses a kind of test devices for detecting geomembrane leakage in situ, it is related to hydraulic engineering technical field, including geomembrane, geomembrane covers the outer surface of channel slope protection, water stop is fixedly installed on geomembrane, and water stop is connected with film clamping;Film is communicated with the open end of hose, and the other end opening of hose is communicated with measuring assembly.The utility model is through the design water stop, and through sealing glue first water stop is adhered on geomembrane, then film is sealed with water stop inner sealing strip by outer sealing strip, again through the water inlet on film and hose connection, the other end of hose is connected with scale pipette, and its pipette is fixed on scale support, water is added in pipette, and water level is just to pipette ±0mL, stop adding water, observe water level change under unit time and observe, simple structure is convenient for layout, and environmental adaptability to detection is strong, and measurement result is simple and clear, and measurement accuracy is high.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering technology, and in particular to a test device for on-site testing of geomembrane permeability. Background Technology

[0002] Geomembranes are widely used as seepage prevention layers in water conservancy projects. Their permeability directly affects the seepage prevention safety of the project. However, there is basically no testing of the permeability of geomembranes laid on-site.

[0003] Currently, the main method relies on on-site sampling followed by testing with a laboratory standard permeameter. This not only damages the integrity of the on-site seepage prevention structure, but also fails to reflect the actual overall construction quality due to the small sample size.

[0004] Therefore, it is of great significance to develop a high-precision, integrated on-site testing device for geomembrane leakage that is suitable for complex construction sites. Utility Model Content

[0005] The purpose of this invention is to provide a test device for on-site testing of geomembrane permeability, thereby solving the problems listed in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model discloses a test device for on-site testing of geomembrane leakage, comprising a geomembrane, the geomembrane covering the outer surface of a channel slope, and a waterstop strip fixedly installed on the geomembrane, the waterstop strip being snapped into the membrane;

[0008] The membrane is connected to one end of the hose, and the other end of the hose is connected to the measuring component.

[0009] Preferably, the measuring assembly includes a support and a pipette, the support being placed on the top plane of the channel slope protection;

[0010] The pipette is slidably connected to the support via a clamp, and the upper surface of the clamp is flush with the opening of the pipette. The lower opening of the pipette is connected to the flexible tube, and a sealing cap is installed at the upper opening of the pipette.

[0011] Preferably, the cross-sectional shape of the waterstop strip is Z-shaped.

[0012] Preferably, a scale is provided at the upper end of the bracket.

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

[0014] This invention relates to a test device for on-site testing of geomembrane leakage. It utilizes a Z-shaped waterstop strip, which is first adhered to the geomembrane using sealant. The membrane is then connected to the inner sealing strip of the Z-shaped waterstop strip via an outer sealing strip. A water inlet on the plastic membrane is connected to a flexible hose, the other end of which is connected to a graduated pipette. The pipette is fixed to a graduated bracket, and water is added to the pipette until the water level reaches ±0 mL. Water is then added until a predetermined time is reached, and the leakage rate is observed based on the liquid level. This device has a simple structure, is easy to deploy, is highly adaptable to different testing environments, and provides clear and accurate measurement results. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the overall layout of a test device for on-site testing of geomembrane permeability according to the present invention;

[0017] Figure 2 This is a top view schematic diagram of the waterstop strip of this utility model;

[0018] Figure 3 This is a side view of the waterstop strip of this utility model;

[0019] Figure 4 This is a front view schematic diagram of the thin film of this utility model;

[0020] Figure 5 This is a top view schematic diagram of the thin film of this utility model;

[0021] Figure 6 This is a schematic diagram of the bracket of this utility model;

[0022] Figure 7 This is a schematic diagram of the pipette of this utility model.

[0023] Explanation of reference numerals in the attached drawings: 1. Geomembrane; 2. Waterstop strip; 3. Membrane; 4. Flexible hose; 5. Support; 6. Pipette. Detailed Implementation

[0024] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0025] like Figure 1-7 As shown, a test device for on-site testing of geomembrane permeability includes a geomembrane 1, which covers the outer surface of a channel slope protection, and a waterstop strip 2 is fixedly installed on the geomembrane 1, which is snapped into a film 3.

[0026] The membrane 3 is connected to one end of the hose 4, and the other end of the hose 4 is connected to the measuring component.

[0027] Specifically, the measuring assembly includes a support 5 and a pipette 6, with the support 5 placed on the top plane of the channel slope protection;

[0028] The pipette 6 is slidably connected to the support 5 via a pipe clamp, and the upper plane of the pipe clamp is flush with the opening of the pipette 6. The lower opening of the pipette 6 is connected to the flexible tube 4, and the upper opening of the pipette 6 is fitted with a sealing cap to prevent water evaporation during the measurement process, which would affect the measurement results. After water is added to the space formed by the waterstop strip and the membrane through the pipette, and the water level is controlled at a specified position, the sealing cap is used to seal the upper opening of the pipette.

[0029] Specifically, the cross-sectional shape of the waterstop strip 2 is Z-shaped. In actual use, the Z-shaped waterstop strip is arranged into a circle and sealed on the outer surface of the geomembrane.

[0030] Specifically, a scale is provided at the upper end of the bracket 5.

[0031] The working principle of this utility model:

[0032] After covering a large area of ​​the already laid geomembrane with a fully sealable film, the interior is filled with water to check for leaks. Addressing the challenge of maintaining sealing and stability in complex terrains (such as slopes and uneven surfaces) when using a covered film, this invention employs a Z-shaped waterstop strip. The waterstop strip is first adhered to the geomembrane using sealant. Then, the film is connected to the inner sealing strip of the Z-shaped waterstop strip via an outer sealing strip. A water inlet on the plastic film is then connected to a flexible hose, the other end of which is connected to a graduated pipette. The pipette is fixed to a graduated bracket, and water is added until the water level reaches ±0 mL. Adding water is then stopped, and two hours are waited. If the water level does not drop, it indicates that the geomembrane is leak-free.

[0033] The measurement method of this utility model:

[0034] 1) Randomly select test locations on the geomembrane to be tested, clean and dry the test locations, stick the Z-shaped waterstop strip to the geomembrane with sealant, and connect the membrane to the Z-shaped waterstop strip through the inner and outer sealing strips;

[0035] 2) Place a graduated bracket at a high point above the Z-shaped waterstop strip, and adjust the sliding tube clamp to the acm position. Clamp the pipette and adjust the ±0mL position of the pipette to the center of the clamp. Finally, connect the lower end of the pipette to the membrane waterstop through the tubing.

[0036] 3) Inject water into the space sealed by the membrane through the hose until it reaches ±0mL of the pipette. At this time, time t1 is started. After waiting for 2 hours, the permeation volume VmL is measured through the pipette. Then, the vertical distance ▽h between the center of the geomembrane leakage detection device and the ±0mL point of the pipette on the graduated bracket is measured. The permeability k is calculated using the formula (1).

[0037]

[0038] In the formula, K represents permeability, expressed in mL / s.

[0039] V—Permeation volume, in mL;

[0040] A—Water-transfer area of ​​the sample, in cm² 2 Diameter 80cm, area 5024cm² 2 ;

[0041] ▽h—Vertical distance between the center of the geomembrane leakage detection device and the ±0mL point on the liquid transfer tube of the graduated bracket, in cm;

[0042] t—the duration of water flow V, in seconds; 2 hours = 7200 seconds;

[0043] 4) The indicators for determining the penetration rate are based on the design or contract requirements.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A test device for detecting the leakiness of geomembranes in situ, comprising a geomembrane (1), characterised in that: The geomembrane (1) covers the outer surface of the channel slope protection, and a waterstop strip (2) is fixedly installed on the geomembrane (1). The waterstop strip (2) is snapped into the film (3). The membrane (3) is connected to one end of the hose (4), and the other end of the hose (4) is connected to the measuring component.

2. The test device for on-site testing of geomembrane permeability according to claim 1, characterized in that: The measuring assembly includes a support (5) and a pipette (6), the support (5) being placed on the top plane of the channel slope protection; The pipette (6) is slidably connected to the support (5) by a pipe clamp, and the upper surface of the pipe clamp is flush with the opening of the pipette (6). The lower opening of the pipette (6) is connected to the flexible tube (4), and a sealing cap is installed on the upper opening of the pipette (6).

3. The test device for on-site testing of geomembrane permeability according to claim 1, characterized in that: The cross-sectional shape of the waterstop strip (2) is Z-shaped.

4. The test device for on-site testing of geomembrane permeability according to claim 2, characterized in that: A scale is provided at the upper end of the bracket (5).

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