Leakage detection device and method for ground cracks

Abstract

The present invention relates to the technical field of leakage investigation of groundwater pollution sources, and in particular to a leakage detection device and method for ground cracks. The detection device comprises: a detection slot, a sealing head and a sealing gasket; the detection slot comprises a container body with a bottom opening, the sealing head is a ring-shaped one matching the bottom opening of the detection slot, the upper end of the sealing head is provided with an annular groove, and the lower end of the sealing head has a toothed surface; the sealing gasket is a ring-shaped one matching the sealing head, the sealing gasket straddles the crack to be detected on the ground, the toothed surface of the sealing head is crimped on the top surface of the sealing gasket, and the bottom opening of the container body is inserted into the annular groove of the sealing head. The present invention can realize leakage detection of ground cracks in key anti-seepage areas, and the operation is simple. After the detection, there is no need to clean the glue at the bottom opening of the container body, which greatly improves the work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater pollution source leakage investigation, and in particular to a leakage detection device and method for ground cracks. Background Art

[0002] Groundwater is an important source of drinking water and a strategic resource, but the situation of groundwater pollution is becoming increasingly complex. Once groundwater is polluted, it is difficult to treat and the cost of treatment is high. It is particularly important to implement "source prevention" for groundwater pollution control. Chemical companies are a key source of groundwater pollution. Cracks may appear in the hardened and impermeable ground in the early stage, and leaked chemicals may seep into the ground along the cracks, thereby polluting the groundwater.

[0003] The investigation of groundwater pollution sources in chemical enterprises is an emerging field and has been widely promoted recently. Carrying out ground crack leakage detection in key anti-seepage areas of chemical enterprises is an important measure for "source prevention" of groundwater pollution. Various groundwater monitoring devices are disclosed in the prior art, such as a water quality sampling device for monitoring water pollution sources, a monitoring well for automatic detection of groundwater level and water quality data, and a pre-installed groundwater intelligent monitoring well device. The above devices are all through sampling groundwater and then monitoring whether the water quality meets the requirements. When it is monitored that the water pollution exceeds the standard, it is too late, and the later repair and rescue will undoubtedly increase the construction cost. Therefore, the prior art lacks scientific leakage detection devices and methods for ground cracks, making it difficult to carry out scientific detection and evaluation work, and it is impossible to avoid groundwater pollution in advance. Summary of the invention

[0004] In view of the deficiencies in the prior art, an embodiment of the present invention aims to provide a leakage detection device for ground cracks to perform leakage detection on the ground in key anti-seepage areas of chemical enterprises.

[0005] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A leakage detection device for ground cracks, comprising: a detection groove, a sealing head and a sealing gasket; the detection groove comprises a container body with a bottom opening, the sealing head is annular in shape matching the bottom opening of the detection groove, an annular groove is provided at the upper end of the sealing head, and a toothed surface is provided at the lower end of the sealing head; the sealing gasket is annular in shape matching the sealing head, the sealing gasket straddles the crack to be detected on the ground, the toothed surface of the sealing head is pressed against the top surface of the sealing gasket, and the bottom opening of the container body is inserted into the annular groove of the sealing head.

[0007] Optionally, the crack is provided with a blocking column, and the blocking column is arranged along the longitudinal direction of the crack. Two blocking columns are provided, and the two blocking columns are respectively located at the junction of the crack and the sealing gasket.

[0008] Optionally, the container body of the detection tank is a glass container, a water inlet is provided on the top of the container body, and the water inlet is provided with a cover plate.

[0009] Optionally, the wall thickness of the container body is greater than the groove width of the annular groove, and the container body and the annular groove are interference fit.

[0010] Optionally, a plurality of serrations are provided on the bottom surface of the sealing head, and the plurality of serrations are parallel to the annular contour of the sealing head.

[0011] Optionally, it further includes a counterweight assembly, wherein two groups of the counterweight assembly are provided, and the two groups of the counterweight assembly are respectively crimped on two sides of the detection slot.

[0012] Optionally, the container body of the detection trough is a rectangular parallelepiped, the counterweight assembly includes a counterweight frame and a counterweight block, the counterweight frame is in an "X" shape, and the "X"-shaped counterweight frame has bearing plates on both sides, and the counterweight block is arranged on the bearing plate of the counterweight frame.

[0013] Optionally, it also includes a liquid level meter, which is installed on the container body. The liquid level meter is a float level meter, and the float of the liquid level meter is set on the liquid surface in the container body.

[0014] Optionally, it also includes a leveling mold, which is a ring-shaped frame structure. The ring-shaped frame structure includes an inner frame and an outer frame of the same shape. The outer frame is sleeved on the outside of the inner frame. There is a set gap between the outer frame and the inner frame, and the gap between the outer frame and the inner frame is greater than the width of the sealing gasket.

[0015] An embodiment of the present invention also provides a leakage detection method for ground cracks, which uses the leakage detection device for ground cracks as described above to perform detection, including: selecting a relatively flat area on the ground, drilling holes in the cracks according to the size of the detection grooves and filling them with plugging columns; installing a sealing head at the bottom opening of a container body, laying a sealing gasket on the crack so that the junction of the sealing gasket and the crack is located at the position of the plugging column, and installing the container body equipped with the sealing head onto the sealing gasket; injecting water into the container body and regularly observing the liquid level changes to determine whether the liquid leakage situation per unit time meets the standards.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0017] 1. The detection device of the present invention divides various gaps, installs a sealing head at the bottom opening of the container body, lays a sealing gasket on the crack, installs the container body equipped with the sealing head on the sealing gasket, injects water into the container body and regularly observes the change of the liquid level, so as to realize the leakage detection of ground cracks. When it is found that the leakage detection of ground cracks is unqualified, the cracks are repaired in time to avoid groundwater pollution in advance, and the cost of groundwater repair is saved. Moreover, compared with the method of sealing with sealant, sealing by means of sealing head and sealing gasket is simple to operate, and there is no need to clean the glue at the bottom opening of the container body after the detection, which greatly improves the work efficiency.

[0018] 2. The leakage detection device and method for ground cracks of the present invention has a relatively simple structure and is easy to operate, but its measurement is relatively accurate and its working method is scientific and reasonable. Compared with the gluing and sealing operation method, it does not require too much waiting time and can still scientifically obtain leakage data, which can fill the gap in the industry.

[0019] Advantages of additional aspects of the present invention will be given in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 is an exploded view of a detection tank, a counterweight assembly and a liquid level gauge according to an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the cooperation between the container body, the sealing head and the sealing gasket according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a sealing gasket according to an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the use of a leveling mold according to an embodiment of the present invention;

[0025] Figure 5 is a schematic diagram of a leveling mold according to an embodiment of the present invention;

[0026] Figure 6 is a schematic diagram of a crack and a plugging column according to an embodiment of the present invention;

[0027] Figure 7is a schematic diagram of a detection state from a horizontal perspective of an embodiment of the present invention (wherein the sealing head and the sealing gasket are hidden);

[0028] Figure 8 is a schematic diagram of the detection state from a longitudinal perspective of an embodiment of the present invention (wherein the sealing head and the sealing gasket are hidden);

[0029] Fig. 9 is a leakage process curve diagram of an embodiment of the present invention;

[0030] In the figure: 1, detection tank; 11, container body; 12, cover plate; 2, counterweight assembly; 21, counterweight frame; 22, counterweight block; 3, liquid level gauge; 4, sealing head; 5, sealing gasket; 6, ground; 61, crack; 62, blocking column; 7, leveling mold;

[0031] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] like Figure 1-Figure 8 As shown, in one embodiment of the present invention, a leakage detection device for ground cracks is proposed to perform leakage detection on the ground 6 in key anti-seepage areas of chemical enterprises, such as cracks 61 in the plant tank area or production equipment area, construction joints, etc. The device is mainly suitable for leakage detection of various plane gaps and corner gaps, and is not suitable for other types of leakage detection such as pipelines.

[0034] The detection device comprises: a detection tank 1, a sealing head 4 and a sealing gasket 5; wherein the detection tank 1 comprises a container body 11 with a bottom opening, the sealing head 4 is an annular shape matching the bottom opening of the detection tank 1, the upper end of the sealing head 4 is provided with an annular groove, and the lower end of the sealing head 4 has a toothed surface; the sealing gasket 5 is an annular shape matching the sealing head 4 (such as Figure 3 As shown), the sealing gasket 5 straddles the crack 61 to be detected on the ground 6, the toothed surface of the sealing head 4 is crimped on the top surface of the sealing gasket 5, and the bottom opening of the container body 11 is inserted into the annular groove of the sealing head 4.

[0035] The detection device of the present invention selects a relatively flat area of ​​the ground 6, divides various gaps into units of 0.5 meters, installs the sealing head 4 at the bottom opening of the container body 11, lays the sealing gasket 5 on the crack 61, installs the container body 11 equipped with the sealing head 4 on the sealing gasket 5, injects water into the container body 11 and observes the liquid level change regularly to realize leakage detection of the crack 61 of the ground 6. Moreover, compared with the method of sealing with sealant (needing to wait for about 10 hours), the sealing by the sealing head 4 and the sealing gasket 5 is simple to operate, and there is no need to clean the glue at the bottom opening of the container body 11 after the detection, which greatly improves the work efficiency.

[0036] like Figure 6 As shown, blocking columns 62 are provided at both ends of a crack 61, and the blocking columns 62 are arranged along the longitudinal direction of the crack 61. Figure 7 As shown, two blocking columns 62 are provided, and the two blocking columns 62 are respectively located at the intersection of the crack 61 and the sealing gasket 5. Through the blocking columns 62, the sealing gasket 5 and the sealing head 4, the detection slot 1 and the middle crack 61 form a relatively closed space, preventing the detection liquid from flowing laterally along the crack 61, thereby ensuring the test accuracy.

[0037] Further, such as Figure 1 As shown, the container body 11 of the detection tank 1 is a glass container. By using a transparent glass container, it is easy to observe the loss of the internal detection liquid. A water injection port is provided on the top of the container body 11 to facilitate adding the detection liquid into the glass container. Furthermore, the water injection port is provided with a cover plate 12. After the detection liquid is filled, the cover plate 12 is covered to prevent dust from entering or the detection liquid from evaporating outward and affecting the detection accuracy.

[0038] The sealing head 4 is a toothed type sealing head 4, and the cross section of the sealing head 4 is as follows Figure 2 As shown, the upper end is an annular groove and the lower end is a serrated surface. The wall thickness of the container body 11 is greater than the groove width of the annular groove, and the container body 11 and the annular groove are interference fit to ensure that the container body 11 and the sealing head 4 are closely fitted to achieve good sealing and prevent leakage of the test liquid from affecting the test results.

[0039] At the same time, the bottom surface of the sealing head 4 is provided with a plurality of saw teeth, and the plurality of saw teeth are parallel to the annular contour of the sealing head 4, that is, each saw tooth forms an annular shape along the contour of the sealing head 4, and the plurality of annular saw teeth are sleeved in sequence. When the sealing head 4 is crimped onto the sealing gasket 5, the plurality of saw teeth are embedded in the sealing gasket 5 to form a multi-pass seal to prevent leakage of the test liquid from affecting the test result.

[0040] Furthermore, the leakage detection device also includes a weight assembly 2, such as Figure 1 , Figure 7 , Figure 8As shown, the counterweight assembly 2 is provided with two groups, and the two groups of the counterweight assembly 2 are respectively pressed on both sides of the detection tank 1. Specifically, the container body 11 of the detection tank 1 is a rectangular parallelepiped, and the counterweight assembly 2 includes a counterweight frame 21 and a counterweight block 22. The counterweight frame 21 is in the shape of a "X", and there are bearing plates on both sides of the "X"-shaped counterweight frame 21. The counterweight block 22 is arranged on the bearing plate of the counterweight frame 21. By installing the counterweight assembly 2 on the container body 11, a tight fit is formed between the container body 11 and the sealing head 4, and between the sealing head 4 and the sealing gasket 5, so as to achieve good sealing performance and prevent leakage of the detection liquid from affecting the detection results.

[0041] like Figure 1 As shown, the leakage detection device further includes a liquid level gauge 3, which is mounted on the container body 11. The liquid level gauge 3 is a float level gauge 3, and the float of the liquid level gauge 3 is arranged on the liquid surface in the container body 11. Compared with the reading method of making scales on the glass container, the reading accuracy is improved by the float level gauge 3.

[0042] like Figure 4 , Figure 5 As shown, the leakage detection device further includes a leveling mold 7, and the leveling mold 7 is an annular frame structure, and the annular frame structure includes an inner frame and an outer frame of the same shape, and the outer frame is sleeved on the outer side of the inner frame, and there is a set gap between the outer frame and the inner frame, and the gap between the outer frame and the inner frame is greater than the width of the sealing gasket 5. When the ground 6 of the crack 61 is not flat, the leveling mold 7 is first placed on the crack 61, and a ring-shaped boss structure with a flat top surface is cast into the gap between the inner and outer frames of the leveling mold 7, and then the sealing gasket 5, the sealing head 4 and the container body 11 are placed on the boss structure in sequence, as shown in FIG. Figure 4 As shown, the boss structure, the sealing gasket 5, the sealing head 4 and the container body 11 form a relatively closed space between the detection slot 1 and the middle crack 61, thereby preventing the detection liquid from flowing laterally along the crack 61 and ensuring the test accuracy.

[0043] Based on the above detection device, the present invention also provides a leakage detection method for ground crack 61:

[0044] 1. Select a relatively flat area on the ground 6, drill a hole at the intersection of the glass container and the crack 61 on the ground 6, fill it with quick-drying sealing cement, and make the top of the filling cement flush with the ground 6 to form a sealing column 62, cutting off the flow path of water (testing liquid) along the crack 61. Since cement has high viscosity, it will not flow along the crack 61 for a long distance.

[0045] 2. For a flat ground 6, directly apply the micro-foam rubber sealing pad 5, and then place the glass container with the sealing head 4 installed to form a good seal between the ground 6 and the glass container. For an uneven ground 6, use a leveling mold 7, pour quick-drying plugging cement in the mold, ensure that the top surface is flat, and after about 10 minutes, the cement is solidified, and the micro-foam rubber sealing pad 5 can be applied.

[0046] 3. Pour about 20cm of clean water into the water inlet of the glass container, use the float type liquid level meter 3 to observe the change of liquid level, and determine the recording interval according to the speed of water level drop. The specific observation time can be 1, 2, 3, 4, 6, 8, 10, 15, 20, 30, 40, 60, 80, 100, 120, 150min, and then observe once every 30 minutes. After the test is completed, the Ht curve needs to be drawn (such as Fig. 9 As shown), the three stages of leakage are determined, especially the third stage, to calculate the leakage flow.

[0047] like Fig. 9 As shown in the figure, when the test starts, the leakage rate changes in three stages:

[0048] 1. Rapid filling stage of cracks / open voids (corresponding to 0-t1): During this stage, the water level drops fastest, mainly filling cracks / open voids, accompanied by concrete water absorption and leakage;

[0049] 2. Local concrete water absorption saturation stage (corresponding to t1-t2): At this stage, the cracks / open gaps have been completely filled with water, and local concrete water absorption and leakage occur;

[0050] 3. Stable leakage stage (corresponding to t2-t3): In this stage, the water absorption of concrete is weakened, and the impact on water consumption can be ignored. It leaks at a relatively stable speed. The final leakage speed is based on this stage, and its leakage flow rate can be defined as:

[0051]

[0052] Where:

[0053] Q represents the stable leakage flow, unit is cm 3 / min / m; L1 and L2 represent the inner length and width of the glass container, respectively, in cm; H2 and H3 represent the water levels at the beginning and end of the stable infiltration stage, in cm; L3 represents the crack length, in m; t2 and t3 represent the duration at the beginning and end of the stable infiltration stage, in min.

[0054] If Q approaches 0, it indicates that the cracks have not penetrated into the underground or the anti-seepage layer has not been damaged, and only surface repair of the cracks is required; if Q>0 and infiltration occurs at a certain slow or relatively fast rate, it indicates that the cracks have fully penetrated or the anti-seepage layer has been damaged, and strict anti-seepage and leakage measures must be taken to avoid groundwater pollution in advance and save groundwater repair costs.

[0055] 4. For cracks 61 that descend rapidly, red pigment can be added to conduct core sampling to verify whether it has completely penetrated into the soil layer.

[0056] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A leakage detection device for ground cracks, characterized in that: include: Test slots, sealing heads and sealing gaskets; The detection tank comprises a container body with an opening at the bottom, the sealing head is annular and matches the opening at the bottom of the detection tank, an annular groove is arranged at the upper end of the sealing head, and a toothed surface is arranged at the lower end of the sealing head; The sealing gasket is annular and matches the sealing head. The sealing gasket straddles the crack to be detected on the ground. The toothed surface of the sealing head is pressed against the top surface of the sealing gasket. The bottom opening of the container body is inserted into the annular groove of the sealing head. The bottom surface of the sealing head is provided with a plurality of saw teeth, and the plurality of saw teeth are parallel to the annular contour of the sealing head; The crack is provided with a blocking column, which is arranged in the longitudinal direction of the crack. Two blocking columns are provided, and the two blocking columns are respectively located at the intersection of the crack and the sealing gasket; It also includes a leveling mold, which is an annular frame structure. The annular frame structure includes an inner frame and an outer frame of the same shape. The outer frame is sleeved on the outside of the inner frame. There is a set gap between the outer frame and the inner frame, and the gap between the outer frame and the inner frame is greater than the width of the sealing gasket. An annular boss structure with a flat top surface is formed by casting in the gap between the inner and outer frames of the leveling mold, and the sealing gasket, sealing head and container body are placed on the boss structure in sequence to form a relatively closed space.

2. The leakage detection device for ground cracks according to claim 1, characterized in that: The container body of the detection tank is a glass container, and a water inlet is arranged on the top of the container body, and a cover plate is arranged on the water inlet.

3. The leakage detection device for ground cracks according to claim 1, characterized in that: The wall thickness of the container body is greater than the groove width of the annular groove, and the container body and the annular groove are in interference fit.

4. The leakage detection device for ground cracks according to claim 1, characterized in that: It also includes a counterweight component, which is provided in two groups. The two groups of the counterweight components are respectively pressed on both sides of the detection groove.

5. The leakage detection device for ground cracks according to claim 4, characterized in that: The container body of the detection tank is a rectangular parallelepiped, and the counterweight assembly includes a counterweight frame and a counterweight block. The counterweight frame is in an "X" shape, and the "X"-shaped counterweight frame has bearing plates on both sides, and the counterweight block is arranged on the bearing plate of the counterweight frame.

6. The leakage detection device for ground cracks according to claim 1, characterized in that: It also includes a liquid level meter, which is installed on the container body. The liquid level meter is a float level meter, and the float of the liquid level meter is arranged on the liquid surface in the container body.

7. A method for detecting leakage of ground cracks, using the leakage detection device for ground cracks according to any one of claims 1 to 6 for detection, characterized in that: include: Select an area with relatively flat ground, drill holes on the cracks according to the size of the test slots, and then fill in the plugging columns; Install the sealing head at the bottom opening of the container body, lay a sealing gasket on the crack so that the intersection of the sealing gasket and the crack is located at the blocking column position, and install the container body equipped with the sealing head onto the sealing gasket; Fill the container with water and regularly observe the changes in the liquid level to determine whether the liquid leakage per unit time meets the standards.

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