Device for collecting volatile organic compounds in cracks of pollutant interception bearing structure of polluted site

Abstract

The invention provides a device for collecting volatile organic compounds in a crack of a pollution interception bearing structure of a polluted site, the device comprises a gas storage assembly and a support frame, the gas storage assembly comprises a tank body, and the tank body is a cylinder with a closed top end and an open bottom end; an opening and closing assembly is arranged at the opening of the bottom end of the tank body and used for opening and closing the opening of the bottom end of the tank body; the tank body is hung on the supporting frame, and a gravimeter is installed between the tank body and the supporting frame and used for measuring the weight of the tank body. According to the device for collecting the volatile organic compounds in the cracks of the pollution interception bearing structure of the polluted site, the volatile organic compounds in the cracks of the damaged pollution interception bearing structure can be collected in situ for detection, and the detection accuracy is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of structure performance detection in polluted sites, and in particular, relates to a device for collecting volatile organic matter in cracks of a pollution interception bearing structure in a polluted site. Background Art

[0002] Horizontal sewage interception bearing structures such as production workshops, tank areas, and roads in production enterprises often have the dual functions of bearing external loads and blocking the migration of pollutants. These structures are mostly made of concrete materials, which are prone to cracking under the external load and corrosion of production waste liquid, resulting in a large number of cracks, which become the dominant channel for the migration of pollutants. In sites with volatile organic compound pollution, volatile organic compounds migrate to production workshops or the atmosphere through cracks, posing a threat to the health of production personnel. During production and control work, it is required to monitor the horizontal structures in production workshops, tank areas, and roads to evaluate their service performance. The concentration of volatile organic compounds in the cracks of damaged horizontal sewage interception bearing structures is an important basis for judging the degree of structural damage and formulating subsequent repair and control measures. However, the current evaluation of sewage interception bearing structures mainly adopts visual inspection and sampling test methods. The visual inspection method mainly monitors the integrity of the structure and the degree of crack development by visual inspection, which has the disadvantages of high subjectivity and difficulty in quantifying monitoring data. The core sampling test method is mainly for areas with small cracks. After collecting the core sample of the structure, the permeability coefficient or diffusion coefficient of the structure is obtained through indoor tests. Since the areas with more serious damage are the key areas of concern for pollutant migration, the cracks in this area are continuous and it is impossible to obtain a complete core sample, so the coring test method cannot be applied. In addition, the concentration of organic matter in the damaged cracks of the structure is an important parameter to characterize the ability of pollutants in the soil under the horizontal structure to migrate to the outside world, and can truly reflect the situation of pollutants migrating through in-situ cracks. However, there is currently no corresponding detection device that can realize the collection of organic matter concentration in cracks after the horizontal structure is damaged, such as the production workshop, tank area, road surface or ground of the production enterprise. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a device for collecting volatile organic compounds in cracks of pollution interception bearing structures in polluted sites, which can collect volatile organic compounds in cracks of damaged pollution interception bearing structures in situ for detection, thereby improving detection accuracy.

[0004] To solve the above technical problems, the embodiments of the present invention adopt the following technical solutions: An embodiment of the present invention provides a device for collecting volatile organic compounds in cracks of a pollution interception bearing structure in a contaminated site, comprising a gas storage component and a support frame, wherein the gas storage component comprises a tank body, which is a cylinder with a closed top and an open bottom; an opening and closing component is provided at the opening at the bottom of the tank body, and the opening and closing component is used to open and close the bottom opening of the tank body; the tank body is hoisted on the support frame, and a gravimeter is installed between the tank body and the support frame for measuring the weight of the tank body.

[0005] As a further improvement of an embodiment of the present invention, the opening and closing assembly includes a fixed plate and a rotating plate, the fixed plate is installed at the bottom opening of the tank body; the fixed plate includes a fixed disc, and a plurality of fan-shaped fixed connecting holes are evenly spaced on the fixed disc, and a fan-shaped fixed barrier piece is provided between two adjacent fixed connecting holes, and the fixed connecting holes and the fixed barrier pieces are equal in size and number; the rotating plate is located above the fixed plate and abuts against the fixed plate; the rotating plate has the same structure as the fixed plate, and has a rotating connecting hole and a rotating barrier piece; the rotating plate is connected to a servo motor installed at the top of the tank body through a rotating shaft, and the servo motor is used to drive the rotating shaft to drive the rotating plate to rotate, thereby opening and closing the bottom opening of the tank body.

[0006] As a further improvement of the embodiment of the present invention, a first limiting seal is provided at the bottom edge of the rotating barrier piece, and a second limiting seal is provided at the top edge of the fixed barrier piece.

[0007] As a further improvement of the embodiment of the present invention, it also includes a sealing cover, wherein a second air inlet pipe is provided at the top of the sealing cover and a second air outlet pipe is provided at the bottom.

[0008] As a further improvement of the embodiment of the present invention, a gas dispersion plate is provided in the upper inner portion of the sealing cover.

[0009] As a further improvement of the embodiment of the present invention, the gas dispersion plate includes a plate body with a cavity, the top end surface of the plate body is provided with an air inlet connected to the second air inlet pipe; the bottom end surface of the plate body is evenly distributed with multiple air outlet holes.

[0010] As a further improvement to the embodiment of the present invention, a sealing assembly is provided outside the tank body.

[0011] As a further improvement of an embodiment of the present invention, the sealing assembly includes a sealing drive, a pair of connecting arms and a pair of semicircular sealing rings. The pair of sealing rings are respectively connected to the sealing drive through a pair of connecting arms. The sealing drive is used to control the rotation of the connecting arms to drive the sealing rings to open and close.

[0012] As a further improvement to the embodiment of the present invention, the diameter of the tank body is 25 to 50 times the maximum width of the crack of the sewage interception bearing structure.

[0013] As a further improvement of the embodiment of the present invention, during operation, the tank body is placed in a sampling hole located at a crack of a pollution interception bearing structure of a polluted site, and a preset distance is provided between the bottom end of the tank body and the bottom end of the sampling hole.

[0014] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: The device for collecting volatile organic compounds in cracks of a pollution interception bearing structure of a polluted site provided by the present invention uses the tank body of a gas storage component to collect volatile organic compounds in sampling holes opened at the gaps of a horizontal barrier, so that the volatile organic compounds in the cracks can migrate to the tank body of the gas storage tank through diffusion, and the tank body is hung on a support frame, and a gravimeter is used to measure the weight of the tank body to determine whether the volatile organic compounds are evenly diffused in the tank body. When the volatile organic compounds are evenly diffused, that is, the concentration of volatile organic compounds in the tank body is the same as the concentration of organic compounds in the cracks, the concentration of volatile organic compounds in the tank body measured is the concentration of volatile organic compounds in the cracks. The device of the present invention can collect volatile organic compounds in situ in the gaps of the pollution interception bearing structure, and achieve the same concentration of volatile organic compounds in the tank body as the concentration of organic compounds in the cracks, thereby improving the detection accuracy and effectively overcoming the test errors caused by the disturbance of the sample core in the existing coring test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a device for collecting volatile organic compounds in cracks of a pollution interception bearing structure of a polluted site according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the middle gas storage assembly; Figure 3 (a) Yes Figure 2 A schematic cross-sectional view of the gas storage assembly shown with the bottom opening in a closed state; Figure 3 (b) Yes Figure 2 A BB' cross-sectional schematic diagram of the bottom opening of the gas storage assembly shown in a closed state; Figure 3 (c) Figure 2 A schematic diagram of the A-A' cross section of the gas storage assembly shown in the open state with the bottom opening thereof; Figure 3 (d) Figure 2 A BB' cross-sectional schematic diagram of the bottom opening of the gas storage assembly shown in an open state; Figure 3 (e) Figure 2 A CC' cross-sectional schematic diagram of the bottom opening of the gas storage assembly shown in a closed state; Figure 4 (a) Figure 2 A schematic diagram of the structure of the fixed barrier sheet of the middle fixed plate; Figure 4 (b) Figure 2 A schematic diagram of the structure of the rotating barrier of the central rotating plate; Figure 4 (c) Yes Figure 3 (e) Schematic diagram of the D-D' section; Figure 5 (a) Yes Figure 1 A schematic diagram of the structure of the middle sealing assembly in a closed state; Figure 5 (b) Yes Figure 1 A schematic diagram of the structure of the middle sealing component in an open state; Figure 6 (a) Yes Figure 1 A top view of the gas dispersion plate; Figure 6 (b) Yes Figure 1 Bottom view of the gas dispersion plate.

[0016] In the figure: gas storage component 1, tank body 11, rotating shaft 12, rotating plate 13, rotating connecting hole 131, rotating blocking piece 132, first limiting seal 133, fixed plate 14, fixed connecting hole 141, fixed blocking piece 142, second limiting seal 143, sealing piston 15, first air inlet pipe 16, first air outlet pipe 17, helium measuring probe 18, servo motor 19, fixing buckle 110, supporting frame 20, gravimeter 21, integrated port 22, power supply 23, sealing component 3, sealing drive member 31, connecting arm 32, sealing ring 33, information exchanger 4, sealing cover 5, second air inlet pipe 51, second air outlet pipe 52, gas dispersion plate 6, plate body 61, air outlet hole 62, pollution interception bearing structure 7, sampling hole 8. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is described in detail below.

[0018] The embodiment of the present invention provides a device for collecting volatile organic compounds in cracks of a pollution interception bearing structure of a polluted site, such as Figure 1 As shown, the gas storage assembly 1 and the support frame 20 are included. The gas storage assembly 1 includes a tank body 11, which is a cylinder with a closed top and an open bottom. An opening and closing assembly is provided at the bottom opening of the tank body 11, and the opening and closing assembly is used to open and close the bottom opening of the tank body. Figure 2 As shown, a first air inlet pipe 16 communicating with the inner cavity of the tank body 11 is provided at the top of the tank body 11, a first air outlet pipe 17 is provided in the tank body 11, one end of the first air outlet pipe 17 is located at the bottom of the inner cavity of the tank body 11, and the other end is located outside the tank body 11. The tank body 11 is hoisted on a support frame 20, and a gravimeter 21 is installed between the tank body 11 and the support frame 20, and the gravimeter is used to measure the weight of the tank body 11.

[0019] The collection device of the above embodiment, when working, opens a sampling hole 8 at the gap of the interception bearing structure 7, and the sampling hole 8 penetrates the interception bearing structure 7. The bottom opening of the tank body is opened by the opening and closing assembly, and an inert gas (preferably helium) is introduced from the first air inlet pipe 16, so that the air in the tank body 11 is discharged through the first air outlet pipe 17. According to the gas flow meter reading on the inert gas storage tank and the ventilation time, the volume of the introduced inert gas can be obtained. Generally, the volume of the introduced inert gas is 2 to 3 times the volume of the tank body 11. It is considered that the air in the tank body 11 is emptied and the introduction of inert gas is stopped. Thereby, the tank body 11 is filled with inert gas, and the first air inlet pipe 16 and the first air outlet pipe 17 are closed. The support frame 20 is fixed next to the sampling hole 8, the gravimeter 21 and the tank body 11 are hoisted, and the tank body 11 filled with inert gas is placed in the sampling hole 8, and the bottom end of the tank body and the bottom end of the sampling hole have a preset distance. The bottom opening of the tank body is opened by the opening and closing assembly, so that the volatile organic matter in the contaminated foundation under the interception bearing structure 7 is diffused into the tank body. The mass of the tank body is measured regularly. When the difference between the current measurement and the previous measurement is less than 0.5% of the current measurement, it is considered that the volatile pollutants are evenly diffused in the tank body, and the bottom opening of the tank body is closed by the opening and closing assembly. The tank body 1 is taken out of the sampling hole 8, and the concentration of the volatile organic matter in the tank body is measured, that is, the concentration of the volatile organic matter in the gap is obtained.

[0020] The device of this embodiment uses the tank body of the gas storage component to collect volatile organic compounds in the sampling holes opened at the gaps of the horizontal barrier, and uses inert gas as the background gas, which can overcome the interference of volatile organic compounds contained in the detection environment air on the detection. During the detection process, the volatile organic compounds in the cracks can migrate to the tank body of the gas storage tank through diffusion, and at the same time, the inert gas in the tank body 11 migrates to the pores of the soil of the underlying contaminated foundation, and finally achieves a balance between the concentration of volatile organic compounds in the tank body 11 and the concentration of volatile organic compounds in the underlying contaminated foundation. The tank body is hung on a support frame, and a gravimeter is used to measure the weight of the tank body to determine whether the volatile organic compounds are evenly diffused in the tank body. When the volatile organic compounds are evenly diffused, that is, the concentration of volatile organic compounds in the tank body is the same as the concentration of organic compounds in the cracks, the concentration of volatile organic compounds in the tank body measured is the concentration of volatile organic compounds in the cracks. The device of the present invention can collect volatile organic compounds in situ in the gaps of the pollution interception bearing structure, and achieve the same concentration of volatile organic compounds in the tank body as that in the cracks, thereby improving the detection accuracy and providing support for the service performance detection of similar horizontal barrier barriers in production enterprises.

[0021] As a preferred example, Figure 3 As shown, the opening and closing assembly includes a fixed plate 14 and a rotating plate 13. The fixed plate is installed at the bottom opening of the tank body 11, and the rotating plate 13 is located above the fixed plate 14 and abuts against the fixed plate 14. Figure 3 (b) and Figure 3As shown in (d), the fixed plate 14 includes a fixed disc, on which a plurality of fan-shaped fixed connecting holes 141 are evenly spaced, and between two adjacent fixed connecting holes 141 there is a fan-shaped fixed blocking piece 142, and the fixed connecting holes 141 and the fixed blocking pieces 142 are equal in size and number. The rotating plate 13 has the same structure as the fixed plate 14, as shown in FIG. Figure 3 (a) and Figure 3 As shown in (c), the rotating plate 13 includes a rotating disc, on which a plurality of fan-shaped rotating connecting holes 131 are evenly spaced, and between two adjacent rotating connecting holes 131 there is a fan-shaped rotating blocking piece 132, and the rotating connecting holes 131 and the rotating blocking pieces 132 are equal in size and number. The servo motor 19 is fixedly mounted on the top of the tank body 11 through a fixing buckle 110. The servo motor 19 is connected to one end of the rotating shaft 12, and the other end of the rotating shaft 12 is inserted into the tank body 11 and connected to the rotating plate 13. The rotating shaft 12 and the through hole on the top surface of the tank body 11 are sealed by a sealing piston 15. The servo motor is used to drive the rotating shaft to drive the rotating plate to rotate, thereby realizing the opening and closing of the bottom opening of the tank body.

[0022] This embodiment uses a rotating plate and a fixed plate arranged up and down with the same structure. The position of the rotating spacer relative to the fixed connecting hole is changed by rotating the rotating plate. When the rotating spacer is opposite to the fixed connecting hole, the fixed connecting hole is covered, and the opening between the bottom of the tank body and the outside world is closed; when the rotating connecting hole is opposite to the fixed connecting hole, the fixed connecting hole is opened as the opening between the bottom of the tank body and the outside world. Moreover, multiple fixed connecting holes are closed or opened at the same time, and are evenly distributed at the bottom of the tank body. The rotating plate rotates horizontally to close the opening. Compared with the pull-type opening and closing structure, it is easy to control, and the total opening area is large, the air intake per unit time is large and the air intake is uniform, which is conducive to the rapid and smooth entry of volatile organic compounds into the tank body.

[0023] Preferably, as shown in the figure, the bottom edge of the rotating barrier sheet 132 is provided with a first limiting seal 133, and the top edge of the fixed barrier sheet 142 is provided with a second limiting seal 143. When the bottom opening of the tank body is closed, the rotating plate is rotated so that the first limiting seal of the rotating barrier sheet abuts against the second limiting seal of the fixed barrier sheet. The first limiting seal and the second limiting seal both play a role of rotation limiting, so that the rotating barrier sheet completely covers the fixed communication hole, and the rotating communication hole is completely covered by the fixed barrier sheet; moreover, the gap between the rotating barrier sheet and the fixed barrier sheet can be blocked to prevent the volatile organic matter in the tank body from leaking after the collection is completed and affecting the detection accuracy.

[0024] As a preferred example, the collection device of this embodiment further includes a sealing cover 5, such as Figure 1As shown, the top of the sealing cover 5 is provided with a second air inlet pipe 51, and the lower part is provided with a second air outlet pipe 52. There is no gap at the joint of the sealing cover 5 and the pollution interception bearing structure 7. The diameter of the sealing cover 5 is more than 10 times the diameter of the sampling hole 8, and the height of the sealing cover 5 is more than 5 times the height of the sampling hole 8.

[0025] Before collecting volatile organic compounds, inert gas is introduced into the sealing cover 5. The volume of the introduced inert gas can be obtained according to the gas flow meter reading on the inert gas storage tank and the ventilation time. Generally, the volume of the introduced inert gas is 2 to 3 times the volume of the sealing cover 5. When the air in the sealing cover 5 is considered to be emptied, the introduction of inert gas is stopped, so that the sealing cover 5 is filled with inert gas. The second air inlet pipe 52 and the second air outlet pipe 53 are closed.

[0026] In this embodiment, the sealing cover 5 is covered above the sampling hole and an inert gas is introduced to isolate the tank body 11 from the surrounding atmosphere, thereby eliminating the influence of volatile organic compounds in the atmosphere on the detection result.

[0027] Preferably, a gas dispersion plate 6 is provided in the upper part of the sealing cover 5. Specifically, Figure 6 As shown, the gas dispersion plate 6 includes a plate body 61 having a cavity, and the top surface of the plate body 61 is provided with an air inlet, which is connected to the second air inlet pipe 51. The lower end surface of the plate body 61 is evenly distributed with a plurality of air outlet holes 62, and the sum of the areas of all the air outlet holes 62 is greater than or equal to 60% of the area of ​​the lower end surface of the plate body 61. In this embodiment, the dispersion plate 6 is arranged in the sealing cover 5, so that the inert gas is quickly and evenly distributed in the sealing cover 5, so as to quickly collect and shorten the detection time.

[0028] As a preferred example, Figure 1 As shown, a sealing assembly 3 is provided outside the tank body 11 and is located at the top of the sampling hole. Specifically, the sealing assembly 3 includes a sealing drive 31, a pair of connecting arms 32 and a pair of semicircular sealing rings 33. The pair of sealing rings 33 are respectively connected to the sealing drive 31 through the connecting arms, and the sealing drive 31 is used to control the rotation of the connecting arms to drive the sealing rings to open and close. The sealing drive 31 is fixed beside the sampling hole, and can be specifically fixed on the base of the support frame. A pair of sealing rings surround the outside of the tank body 11 and are located at the top of the sampling hole. The gravimeter measures the weight of the tank body at fixed intervals. When the gravimeter measures, the sealing drive controls the pair of connecting arms to rotate and drive the pair of sealing rings to separate; after the gravimeter finishes the measurement, the sealing drive controls the pair of connecting arms to rotate and drive the pair of sealing rings to close, thereby closing the gap between the side wall of the tank body and the top of the sampling hole. In this embodiment, an openable and closable sealing assembly 3 is provided outside the tank body 11. The sealing ring is opened before measurement to make the tank body 11 suspended, and the weight test is performed to avoid interference of the sealing ring on the weight test. After the measurement is completed, the sealing ring is closed to prevent the volatile organic matter in the polluted foundation under the interception bearing structure from leaking through the gap between the tank body 11 and the sampling hole 8.

[0029] Considering that the volatile organic matter in the crack can migrate to the tank body 11 through diffusion, and achieving the same concentration of volatile organic matter in the tank body 11 as that in the crack is the key to the characterization test of the concentration of organic matter in the crack. Preferably, the diameter of the tank body 11 is 25 to 50 times the maximum width of the crack of the interception bearing structure. If the diameter of the tank body 11 is too large, it will take a long time to achieve the balance between the concentration of volatile organic matter in the tank body 11 and the concentration of organic matter in the crack, and the detection efficiency is low; moreover, if the diameter of the tank body 11 is too large, it is necessary to open a larger sampling hole on the horizontal barrier, which will cause greater damage to the horizontal barrier. If the diameter of the tank body 11 is too small, the amount of volatile organic matter collected in the tank body 11 is small, resulting in a large error in the detection result. Therefore, this embodiment uses a tank body 11 with a diameter of 25 to 50 times the maximum width of the gap of the interception bearing structure, which can improve the detection accuracy and the detection efficiency.

[0030] Preferably, the sampling hole 8 is cylindrical, and the center of the top surface of the sampling hole 8 is located on the gap of the pollution interception bearing structure. This arrangement can ensure that the volatile pollutants in the contaminated foundation under the pollution interception bearing structure can smoothly diffuse and migrate to the tank body 11, shorten the equilibrium time between the concentration of volatile organic matter in the tank body 11 and the concentration of organic matter in the cracks, and improve the detection efficiency. The diameter of the sampling hole 8 is larger than the diameter of the tank body 11, and the difference does not exceed 0.5 cm. It is ensured that there is a gap between the tank body 11 and the sampling hole, which is convenient for the tank body to be placed in the sampling hole and taken out of the sampling hole. At the same time, it also prevents measurement errors due to friction when measuring the weight of the tank body, and it is impossible to correctly judge whether the volatile organic matter is diffused evenly, thereby affecting the detection accuracy; at the same time, the gap between the tank body 11 and the sampling hole is small, which is convenient for blocking, preventing the volatile organic matter in the contaminated foundation from migrating upward through the gap between the tank body 11 and the sampling hole.

[0031] The working process of the volatile organic matter collection device in the cracks of the pollution interception bearing structure of the dyeing site in the above preferred embodiment is as follows: A sampling hole 8 is opened at the crack of the sewage interception bearing structure, and the gap on the side wall of the sampling hole 8 is sealed.

[0032] The servo motor 19 is controlled to work, and the rotating plate 13 is driven to rotate through the rotating shaft 12, so that the rotating blocking piece 132 overlaps with the fixed connecting hole 141, and the rotating connecting hole 131 overlaps with the fixed blocking piece 142, so that the tank body is closed. Helium is introduced from the first air inlet pipe 16, and the helium enters the tank body. The air in the tank body enters the first air outlet pipe from the bottom of the first air outlet pipe 17, and then is discharged. When the air in the tank body 11 is emptied, the helium is stopped from being introduced, so that the tank body 11 is filled with helium, and the pipe openings of the first air inlet pipe 16 and the first air outlet pipe 17 are closed.

[0033] The support frame 20 is fixed beside the sampling hole 8, the gravimeter 21 and the tank body 11 are hoisted, and the tank body 11 filled with helium is placed in the sampling hole 8. The position of the tank body is adjusted so that the center of the cross section of the tank body coincides with the center of the cross section of the sampling hole, the outer wall of the tank body does not contact the inner wall of the sampling hole, and the bottom of the tank body has a preset distance from the bottom of the sampling hole. The sealing drive controls a pair of connecting arms to rotate and drive a pair of sealing rings to close, thereby closing the gap between the side wall of the tank body and the top of the sampling hole. The information exchanger 4 is installed on the sealing cover 5, and the sealing cover 5 is placed above the sampling hole 8, and the center of the cross section of the sampling hole 8 coincides with the center of the cross section of the sealing cover 5. The joint of the sealing cover 5 and the interception bearing structure 7 is blocked with cement mortar. Helium is introduced from the second air inlet pipe 51, and the helium enters the sealing cover 5, and the air in the sealing cover 5 is discharged from the second air outlet pipe 52. When the air in the sealing cover 5 is emptied, the helium is stopped from being introduced, and the pipe openings of the second air inlet pipe 51 and the second air outlet pipe 52 are closed.

[0034] The servo motor 19 is controlled to work, and the rotating plate 13 is driven to rotate through the rotating shaft 12, so that the rotating connecting hole 131 and the fixed connecting hole 141 overlap, and the volatile pollutants in the contaminated foundation are freely diffused into the tank body. Every two hours, the sealing drive controls a pair of connecting arms to rotate and drive a pair of sealing rings to separate. The gravimeter measures the weight of the tank body. After the weight is obtained, the sealing drive controls a pair of connecting arms to rotate and drive a pair of sealing rings to close. When the difference between this measurement and the previous measurement is less than 0.5% of this measurement, it is considered that the volatile pollutants are evenly diffused in the tank body, and the servo motor 19 is controlled to work, and the rotating plate 13 is driven to rotate through the rotating shaft, so that the rotating barrier 132 overlaps with the fixed connecting hole 141, and the rotating connecting hole 131 overlaps with the fixed barrier 142, so that the tank body is closed.

[0035] The sealing cover 5 is opened and the tank is taken out. Other components are disassembled and taken out of the site together. The first gas outlet pipe 17 is connected to a gas chromatography-mass spectrometer to test and obtain the concentration of volatile organic compounds.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above specific embodiments, and the descriptions in the above specific embodiments and the specification are only for further illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed for protection.

Claims

1. A device for collecting volatile organic compounds in cracks of pollution interception bearing structures in polluted sites, characterized in that: The invention comprises a gas storage assembly (1) and a support frame (20), wherein the gas storage assembly (1) comprises a tank body (11), the tank body (11) being a cylinder with a closed top and an open bottom; an opening and closing assembly is provided at the bottom opening of the tank body (11), the opening and closing assembly is used to open and close the bottom opening of the tank body; the tank body (11) is hoisted on the support frame (20), and a gravimeter (21) is installed between the tank body (11) and the support frame (20) for measuring the weight of the tank body (11).

2. The device for collecting volatile organic compounds in cracks of pollution interception bearing structures in contaminated sites according to claim 1 is characterized in that: The opening and closing assembly comprises a fixed plate (14) and a rotating plate (13), wherein the fixed plate is mounted at the bottom opening of the tank body (11); the fixed plate (14) comprises a fixed disc, wherein a plurality of fan-shaped fixed communication holes (141) are evenly spaced apart on the fixed disc, and a fan-shaped fixed barrier sheet (142) is disposed between two adjacent fixed communication holes (141), wherein the fixed communication holes (141) and the fixed barrier sheets (142) are equal in size and number; the rotating plate (13) is located above the fixed plate (14) and abuts against the fixed plate (14); the rotating plate (13) and the fixed plate (14) have the same structure and are provided with a rotating communication hole (131) and a rotating barrier sheet (132); the rotating plate (13) is connected to a servo motor mounted at the top end of the tank body (11) via a rotating shaft (12), wherein the servo motor is used to drive the rotating shaft to drive the rotating plate to rotate, thereby realizing opening and closing of the bottom opening of the tank body.

3. The device for collecting volatile organic compounds in cracks of pollution interception bearing structures in contaminated sites according to claim 2 is characterized in that: The bottom edge of the rotating barrier sheet (132) is provided with a first limiting seal (133), and the top edge of the fixed barrier sheet (142) is provided with a second limiting seal (143).

4. The device for collecting volatile organic compounds in cracks of pollution interception bearing structures in contaminated sites according to claim 1 is characterized in that: It also comprises a sealing cover (5), wherein a second air inlet pipe (51) is provided at the top of the sealing cover (5) and a second air outlet pipe (52) is provided at the bottom.

5. The device for collecting volatile organic compounds in cracks of pollution interception bearing structures in contaminated sites according to claim 4 is characterized in that: A gas dispersion plate (6) is provided at the upper inner portion of the sealing cover (5).

6. The device for collecting volatile organic compounds in cracks of pollution interception bearing structures in contaminated sites according to claim 5 is characterized in that: The gas dispersion plate (6) comprises a plate body (61) having a cavity, the top end surface of the plate body (61) being provided with an air inlet connected to the second air inlet pipe (51); and the bottom end surface of the plate body (61) being evenly distributed with a plurality of air outlet holes (62).

7. The device for collecting volatile organic compounds in cracks of pollution interception bearing structures in contaminated sites according to claim 1, characterized in that: A sealing assembly (3) is provided outside the tank body (11).

8. The device for collecting volatile organic compounds in cracks of pollution interception bearing structures in contaminated sites according to claim 7 is characterized in that: The sealing assembly (3) comprises a sealing drive member (31), a pair of connecting arms (32) and a pair of semicircular sealing rings (33). The pair of sealing rings (33) are respectively connected to the sealing drive member via a pair of connecting arms. The sealing drive member is used to control the rotation of the connecting arms to drive the sealing rings to open and close.

9. The device for collecting volatile organic compounds in cracks of pollution interception bearing structures in contaminated sites according to claim 1, characterized in that: The diameter of the tank body (11) is 25 to 50 times the maximum width of a crack in the sewage interception bearing structure.

10. The device for collecting volatile organic compounds in cracks of pollution interception bearing structures in contaminated sites according to claim 1, characterized in that: During operation, the tank body is placed in a sampling hole located at a crack in the pollution interception bearing structure of the polluted site, and a preset distance is provided between the bottom end of the tank body and the bottom end of the sampling hole.

Images