An osmometer protection device, method of manufacture, and method of use

Abstract

The application provides a protection device, a manufacturing method and a use method of an osmometer, the protection device of the osmometer comprises an outer protection shell, an outer protection shell bottom plate and a reverse filtration structure layer, the outer protection shell is provided in a conical or gyro shape, the outer protection shell bottom plate is fixedly connected with the outer protection shell, the reverse filtration structure layer is arranged in a space formed by the outer protection shell bottom plate and the outer protection shell, and the osmometer is arranged in the reverse filtration structure layer. The protection device, the manufacturing method and the use method of the osmometer are characterized in that the outer protection shell is provided in a conical or gyro shape, the angle of the bottom sharp corner is 60-90 degrees, the adhesion of the soil on the outer protection shell can be reduced, the bottom sharp corner is easier to enter the soil, the soil breaking effect generated by the bottom sharp corner is beneficial to reduce the extrusion of the soil on the outer protection shell, the osmometer is effectively protected from the extrusion of external force, and the osmometer will not be deformed and fail due to the extrusion.

Description

Technical Field

[0001] This invention relates to the technical field of geotechnical engineering seepage pressure detection devices, and in particular to a protection device for a piezometer, its manufacturing method, and its usage method. Background Technology

[0002] A piezometer is a sensor that can measure changes in water pressure. In geotechnical engineering, it can be used to measure changes in pore water pressure in foundation soil. It can not only monitor the gradual drainage and consolidation process of saturated soil, but also measure the seepage water pressure in the soil. It plays an important role in ensuring foundation safety and verifying design and scientific calculation results.

[0003] In conventional geotechnical engineering monitoring (such as dam construction), piezometers are typically embedded in the foundation structure. In relatively stable environments, drilling is usually performed before inserting the piezometer and pouring concrete. However, in marine engineering, piezometers are placed on the surface of the foundation structure and need to be installed along with the marine engineering structure, penetrating a certain distance into the seabed to reach a designated depth. During construction, the piezometer passes through soil layers of varying properties, such as clay and sand, encountering penetration resistance ranging from hundreds to thousands of kPa, resulting in immense pressure on the piezometer. Furthermore, the piezometer may collide with boulders and other structures on the seabed. Marine engineering structures can range in size from tens of meters to hundreds of meters, while the piezometer is only a few centimeters in size. During the process of penetrating the piezometer into the seabed along with the marine engineering structure, it is highly susceptible to being completely encased in mud, preventing water pressure from being transmitted to the piezometer's inlet.

[0004] In summary, the marine engineering environment is extremely complex and highly unpredictable compared to conventional geotechnical engineering. Piezometers are prone to sensor failure due to various situations such as inlet blockage and structural deformation, resulting in an extremely low effective survival rate. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a protective device, manufacturing method and usage method for a piezometer, which has the characteristics of avoiding damage to the piezometer under pressure, reducing piezometer inlet blockage, facilitating soil excavation and being convenient and efficient to install in marine engineering, and solving the problems of easy inlet blockage, pressure deformation and difficulty in soil excavation of marine engineering structures in the prior art.

[0006] To achieve the above and other related objectives, the present invention provides a protective device for a piezometer, used to protect the piezometer; the protective device for the piezometer includes an outer protective shell, an outer protective shell base plate, and a reverse filtration structure layer, the outer protective shell base plate being fixedly connected to the outer protective shell, the reverse filtration structure layer being disposed in the space formed by the outer protective shell base plate and the outer protective shell, and the piezometer being disposed in the reverse filtration structure layer.

[0007] Preferably, the outer protective shell and the bottom plate of the outer protective shell form a conical or gyroscope-shaped component, and the sharp angle of the outer protective shell is 60-90°.

[0008] Preferably, the reverse filtration structure layer includes a reverse filtration barrier outer layer, a reverse filtration packing layer, and a reverse filtration inner layer, with the piezometer disposed in the reverse filtration inner layer; the reverse filtration packing layer includes a reverse filtration packing coarse particle layer and a reverse filtration packing fine particle layer; the reverse filtration structure layer is used to ensure unobstructed water inlet of the piezometer.

[0009] Preferably, the outer layer of the filter barrier is a woven piece consisting of two layers of geotextile and one layer of geogrid, with the geogrid disposed between the two layers of geotextile.

[0010] Preferably, the outer protective shell has a plurality of surface holes, which allow the internal space of the outer protective shell to communicate with the external space; the outer protective shell is also provided with a bottom plate mounting ear, which is fixedly connected to the outer protective shell through the bottom plate mounting ear.

[0011] Preferably, the outer protective shell is further provided with an outer protective shell cable outlet hole, and the cable of the piezometer is passed through the outer protective shell cable outlet hole.

[0012] Preferably, the thickness of the outer protective shell is greater than 6 mm.

[0013] Preferably, the diameter of the bottom plate of the outer protective shell is 1.5-3 times the length specification of the piezometer.

[0014] To achieve the above or other objectives, the present invention also discloses a method for manufacturing a protection device for a piezometer, employing the aforementioned protection device for the piezometer, comprising the following steps:

[0015] S1: Select raw materials to make the outer protective shell and the base plate of the outer protective shell respectively;

[0016] S2: Select raw materials to make the reverse filter structure layer, and install the osmotic pressure gauge in the reverse filter structure layer;

[0017] S3: Fill the filter structure layer equipped with the piezometer into the outer protective shell, and connect the outer protective shell and the bottom plate of the outer protective shell.

[0018] To achieve the above or other objectives, the present invention further discloses a method for using a protection device for a piezometer, wherein the steps of using the above-mentioned protection device for the piezometer are as follows:

[0019] A1: Fix the protective device of the piezometer to the marine engineering structure, with the sharp corner of the outer protective shell pointing downwards;

[0020] A2: The offshore engineering unit works by penetrating the outer protective shell downwards into the seabed to a specified depth;

[0021] A3: Piezometers detect changes in pore water pressure in the seabed.

[0022] As described above, the protective device, manufacturing method, and usage method of the piezometer involved in this invention have the following beneficial effects:

[0023] 1. The protective device, manufacturing method, and usage method of the piezometer involved in this invention are provided with an outer protective shell in the shape of a cone or gyroscope, with the angle of the sharp corner being 60-90°. This can reduce the adhesion of soil to the outer protective shell, and the sharp corner makes it easier to penetrate the soil. The soil-breaking effect produced by the sharp corner helps to reduce the pressure of the soil on the outer protective shell, effectively protecting the piezometer from external pressure and preventing the piezometer from being squeezed, deformed, or failing.

[0024] 2. The outer protective shell of this invention is made of special steel, which has good corrosion resistance in marine environments; the thickness of the outer protective shell exceeds 6mm, which can meet the impact protection requirements of the outer protective shell, and allows for a certain degree of corrosion within a certain number of years.

[0025] 3. The outer protective shell of this invention is filled with a reverse filter structure layer, and the piezometer is set in the reverse filter structure layer. This effectively avoids the piezometer from being blocked by fine soil particles during its service life, which would cause the piezometer to fail. This ensures that a continuous water head can be formed to meet the measurement requirements of pore water pressure.

[0026] 4. The piezometer in this invention is set in the outer protective shell, which is fixed to the marine engineering mechanism by welding or other means. The marine engineering mechanism inserts the piezometer into the designated position on the seabed, which effectively reduces the difficulty of construction and installation, and ensures good installation quality and convenient operation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the conical space of the protection device for the piezometer of the present invention;

[0028] Figure 2 This is a conical internal sectional view of the protective device of the piezometer of the present invention;

[0029] Figure 3 This is a schematic diagram of the gyroscope-shaped space of the protection device of the piezometer of the present invention;

[0030] Figure 4 This is a gyroscope-shaped internal cross-sectional view of the protection device of the piezometer of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Outer protective shell base plate; 2. Fixing bolts; 3. Outer protective shell; 4. Outer protective shell cable outlet hole; 5. Cable; 6. Outer protective shell surface hole; 7. Outer protective shell base plate mounting lug; 8. Filter barrier outer layer; 9. Filter packing coarse particle layer; 10. Filter packing coarse and fine particle boundary; 11. Filter packing fine particle layer; 12. Filter packing inner layer boundary; 13. Filter packing inner layer; 14. Piezometer. Detailed Implementation

[0033] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0034] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0035] like Figures 1-4 As shown, the present invention provides a protective device for a piezometer, used to protect the piezometer 14; the protective device for the piezometer includes an outer protective shell 3, an outer protective shell base plate 1, and a reverse filter structure layer. The outer protective shell base plate 1 and the outer protective shell 3 are fastened together by fixing bolts 2. The reverse filter structure layer is disposed in the space formed by the outer protective shell base plate 1 and the outer protective shell 3. The piezometer 14 is disposed in the reverse filter structure layer.

[0036] The present invention relates to a protective device for a piezometer, comprising an outer protective shell 3 and an outer protective shell base plate 1. The piezometer 14 is housed within the outer protective shell 3. When the piezometer 14 needs to be inserted into the seabed, the outer protective shell 3 and the outer protective shell base plate 1 can be directly fixedly connected and then installed on a marine engineering structure, directly inserted into the designated location on the seabed. The pointed corners of the outer protective shell 3 face downwards, facilitating easier penetration into the soil. The resulting soil-breaking effect helps reduce the pressure exerted on the outer protective shell 3 by the seabed soil, preventing the piezometer 14 from deforming and failing. The present invention also includes a reverse filter structure layer, within which the piezometer 14 is housed. This prevents fine particles from entering the inlet of the piezometer 14 during its service life and causing blockage, thus ensuring that the piezometer 14 can generate a continuous head, thereby fulfilling the requirement for measuring the pore water pressure in the seabed.

[0037] Preferred, such as Figures 1-4 As shown, the outer protective shell 3 and the outer protective shell base plate 1 form a conical or gyroscope-shaped component, and the sharp angle of the outer protective shell 3 is 60-90°. In this embodiment, the sharp angle of the outer protective shell 3 is preferably 64°.

[0038] First embodiment: The outer protective shell 3 is set in a conical shape.

[0039] In the first embodiment, as Figure 1 , Figure 2 As shown, the outer protective shell 3 is cone-shaped with a cone angle of 60-90°. The cone angle of 60-90° reduces soil adhesion to the outer protective shell 3 during the process of the marine engineering mechanism inserting the piezometer 14 into the seabed. The sharp corner makes it easier to penetrate the seabed, and the resulting soil-breaking effect helps reduce the pressure of the soil on the outer protective shell 3.

[0040] Second embodiment: The outer protective shell 3 is configured as a gyroscope shape.

[0041] In the second embodiment, as Figure 3 , Figure 4 As shown, the outer protective shell 3 is shaped like a gyroscope, with its outer circumferential surface having a larger diameter at the top and bottom ends and a smaller diameter in the middle. A cavity is formed between the smaller diameter surface in the middle and the larger diameter surfaces at both ends. Even when the gyroscope-shaped outer protective shell 3 is completely encased in the seabed, the cavity still provides a drainage path connecting the outer circumference of the outer protective shell 3 to the outside environment, ensuring that the pore water pressure in the seabed is transmitted to the interior of the outer protective shell 3 and measured by the piezometer 14.

[0042] Furthermore, in other embodiments, the outer protective shell 3 can also be square. When the outer protective shell 3 is square, it is necessary to excavate holes in the seabed beforehand and then fill them in, which will affect efficiency. In multiple tests, the weight of soil attached to the outer periphery of the conical outer protective shell 3 is the least, approximately 3.32 kg, the top-shaped is approximately 4.2 kg, and the square is approximately 3.84 kg (the weight of the attached soil is determined by the outer periphery area of ​​the outer protective shell 3, but when comparing the conical, rectangular, and top-shaped shells, the outer periphery size of the three is the same). Moreover, the conical or top-shaped outer protective shell 3 requires less effort during the penetration into the seabed. Therefore, the conical or top-shaped shell is selected in this embodiment.

[0043] Preferred, such as Figure 2 , Figure 4As shown, the reverse filter structure includes an outer reverse filter barrier layer 8, a reverse filter packing layer, and an inner reverse filter layer 13. The piezometer 14 is disposed in the inner reverse filter layer 13. The reverse filter packing layer includes a coarse particle layer 9 and a fine particle layer 11. The reverse filter structure layer is used to ensure the unobstructed flow of the inlet of the piezometer 14. Further, in this embodiment, the inner reverse filter layer 13 is composed of standard quartz sand without clay particles wrapped in geotextile. The standard quartz sand is filled into the geotextile and wrapped around the outer periphery of the piezometer 14. The diameter of the inner reverse filter layer 13 is approximately 15-25 cm to prevent small soil particles from entering and clogging the inlet of the piezometer 14. There is a coarse and fine particle boundary 10 between the coarse particle layer 9 and the fine particle layer 11, and a boundary 12 between the fine particle layer 11 and the inner reverse filter layer 13; the boundary 12 is made of geotextile. Furthermore, in this embodiment, the coarse particle layer 9 of the reverse filter packing uses coarse gravel with a particle size of 20-40 mm, and the fine particle layer 11 of the reverse filter packing uses fine gravel with a particle size of 6-9 mm. The reverse filter packing layer is composed of gravel with different particle sizes, which makes the reverse filter packing layer have good filtration and water permeability, and the reverse filter packing layer can deform in a coordinated manner when subjected to external force, playing a role in buffering and protecting the piezometer 14.

[0044] Preferably, the outer filter layer 8 is a woven component consisting of two layers of geotextile and one layer of geogrid, with the geogrid positioned between the two layers of geotextile. Furthermore, based on the typical particle size of seabed clay, the equivalent pore size of the geotextile is O... 95 For geogrids with a diameter of less than 0.07mm, the strength of the geogrid is not less than 200KN, which can effectively ensure the permeability and anti-clogging properties of the outer layer 8 of the filter barrier, and at the same time effectively prevent the outer layer 8 of the filter barrier from being torn by external forces.

[0045] Furthermore, the filtration accuracy of each layer in the reverse filter structure is as follows: coarse particle layer 9 < fine particle layer 11 < inner layer 13. By relying on the filtration effect of each filter layer in the reverse filter structure, fine particles entering the outer protective shell 3 can be filtered step by step, avoiding the fine particles from clogging the inlet of the osmometer 14 during the service life, which would cause the osmometer 14 to fail.

[0046] Preferred, such as Figure 1 , Figure 3 As shown, the outer protective shell 3 has several surface holes 6, which connect the internal space of the outer protective shell 3 with the external space of the outer protective shell 3. This allows pore water from the seabed to enter the outer protective shell 3, where the pore water pressure is monitored by a piezometer 14. It also prevents silt from clogging the surface holes 6. Furthermore, the diameter of the surface holes 6 is 20-30 mm.

[0047] Preferred, such as Figure 2 , Figure 4 As shown, the outer protective shell 3 is also provided with outer protective shell bottom plate mounting ears 7, and the outer protective shell bottom plate 1 is fixedly connected to the outer protective shell 3 through the outer protective shell bottom plate mounting ears 7. In this embodiment, the outer protective shell bottom plate mounting ears 7 are arranged horizontally on the inner side of the outer protective shell 3, and there are three outer protective shell bottom plate mounting ears 7. The outer protective shell bottom plate 1 has three through holes running vertically through it. The through holes on the outer protective shell bottom plate 1 are aligned with the outer protective shell bottom plate mounting ears 7, and fixing bolts 2 pass through them at the same time. The fixing bolts 2 lock the outer protective shell bottom plate 1 onto the outer protective shell bottom plate mounting ears 7. The included angle between the three outer protective shell bottom plate mounting ears 7 is 120°, and the included angle between the three through holes on the outer protective shell bottom plate 1 is 120°. In other embodiments, the number of outer protective shell bottom plate mounting ears 7 can also be other, as long as the number of outer protective shell bottom plate mounting ears 7 is the same as the number of through holes on the outer protective shell bottom plate 1 and they can be aligned.

[0048] Furthermore, in this embodiment, the outer protective shell 3 is also provided with an outer protective shell cable outlet 4, through which the cable 5 of the piezometer 14 passes. The end of the cable 5 of the piezometer 14 is communicatively connected to the detection, processing and display device. After the piezometer 14 detects the pore water pressure in the seabed, it is displayed through the detection, processing and display device, which facilitates monitoring and management by the operator.

[0049] Furthermore, in this embodiment, the thickness of the outer protective shell 3 is greater than 6 mm. The outer protective shell 3 is made of special steel, which is rich in Cl... - It exhibits good corrosion resistance even in marine environments with halide ions, providing long-term protection for the osmometer 14. The outer protective shell 3 has a thickness greater than 6mm, meeting both the impact resistance requirements and allowing for some corrosion within its service life. Furthermore, the thickness of the outer protective shell base plate 1 is not less than the thickness of the outer protective shell 3. The special steel used in this embodiment can be stainless steel. In this embodiment, when the outer protective shell 3 is conical, its thickness is greater than 6mm; when it is gyroscope-shaped, its thickness is greater than 8mm.

[0050] Furthermore, such as Figure 2As shown, in this embodiment, the diameter of the outer protective shell base plate 1 is 1.5-3 times the length of the piezometer 14. The outer protective shell base plate 1 is circular, and the outer protective shell 3 is fan-shaped. The fan-shaped outer protective shell 3 is bent into a conical or gyroscope-shaped component, and the circular outer protective shell base plate 1 is fixed to the bottom of the conical component by the outer protective shell base plate mounting lug 7. The diameter of the outer protective shell base plate 1 is 1.5-3 times the length of the piezometer 14, and the height of the outer protective shell 3 is 1-1.5 times the length of the piezometer 14. The piezometer 14 is located at the center of the outer protective shell base plate 1, and there is a certain distance between it and the inner wall of the outer protective shell 3, which can prevent the piezometer 14 from being squeezed and deformed during the penetration process.

[0051] Furthermore, the commonly used piezometer 14 is cylindrical with a length of approximately 200 mm. In this application, the diameter of the conical or gyro-shaped outer protective shell base plate 1 is 350 mm, and the height of the outer protective shell 3 is 260 mm; the length, width, and height of the square shell are 300 mm, 160 mm, and 90 mm, respectively.

[0052] To achieve the above or other objectives, the present invention also discloses a method for manufacturing a protection device for a piezometer, employing the aforementioned protection device for the piezometer, comprising the following steps:

[0053] B1: Select special steel with a thickness of not less than 6mm, and cut it into fan-shaped and circular shapes respectively. The fan-shaped special steel is used to produce the conical or gyroscope-shaped outer protective shell 3, and the circular special steel is used to produce the outer protective shell base plate 1. The outer arc length of the fan-shaped outer protective shell 3 is equal to or slightly less than the circumference of the circular outer protective shell base plate 1. The circumference of the outer protective shell base plate 1 = π*R (R is the diameter of the outer protective shell base plate 1).

[0054] B2: Several outer protective shell surface holes 6 and one outer protective shell wire outlet hole 4 are provided on the outer protective shell 3. The outer protective shell 3 is rolled into a conical or gyroscope-shaped part. Three outer protective shell base plate mounting ears 7 are welded horizontally on the inner wall of the outer protective shell 3 of the conical or gyroscope-shaped part. Three through holes are provided through the outer protective shell base plate 1.

[0055] B3: Quartz sand is selected to make the inner filter layer 13, which is wrapped around the outer periphery of the osmometer 14. The diameter of the inner filter layer 13 is about 15-25cm. The coarse particle layer 9 and the fine particle layer 11 of the filter packing are selected to make the outer filter barrier layer 8. There is a coarse particle layer 9 and a fine particle layer 11 of the filter packing between the coarse particle layer 9 and the fine particle layer 11 of the filter packing, and there is a boundary 10 between the coarse and fine particles of the filter packing, and there is a boundary 12 between the fine particle layer 11 and the inner filter layer 13.

[0056] B4: Fill the reverse filter structure layer made in B3 into the conical or gyroscope-shaped part in B2. The cable 5 of the piezometer 14 passes through the cable outlet hole 4 of the outer protective shell. Snap the bottom plate 1 of the outer protective shell onto the mounting ear 7 of the bottom plate of the outer protective shell, and use fixing bolts 2 to pass through the through hole on the bottom plate 1 of the outer protective shell and the mounting ear 7 of the bottom plate of the outer protective shell to fix the bottom plate 1 of the outer protective shell and the outer protective shell 3.

[0057] To achieve the above or other objectives, the present invention also discloses a method for using a protection device for a piezometer, wherein the protection device for the piezometer described above comprises the following steps:

[0058] C1: Place the conical or gyro-shaped component in B4 above into water for immersion until the reading of the osmotic pressure gauge 14 is stable and the water pressure measurement value matches the theoretical value. At this time, each filter layer and the packing particles in the filter layer are saturated.

[0059] C2: The outer protective shell base plate 1 of the conical or gyro-shaped component in C1 above is installed on the marine engineering mechanism by welding or other fixing methods, with the conical angle of the outer protective shell 3 facing outward;

[0060] C3: The offshore engineering mechanism is activated to drive the conical or gyro-shaped component downwards into the seabed to the specified depth;

[0061] C4: Pore water in the seabed enters the inlet of the piezometer 14 through the surface holes 6 of the outer protective shell, the outer filter barrier layer 8, and the inner filter layer 13, forming a continuous water head to meet the measurement requirements of seabed pore water pressure; the piezometer 14 transmits the detected pore water pressure to the detection, processing, and display device on the sea surface through the cable 5.

[0062] C5: After the offshore engineering construction is completed, the marine engineering mechanism pulls out the conical or gyro-shaped component upwards. The operator can then perform corresponding maintenance and repairs based on the corrosion status of the outer protective shell 3 and the blockage in the filter structure layer.

[0063] Furthermore, in this embodiment, the offshore engineering structure is a self-elevating platform vessel. The bottom surface of the pile shoe of the self-elevating platform vessel is fixedly connected to the bottom plate 1 of the outer protective hull.

[0064] The protective device, manufacturing method, and usage method of the piezometer involved in this invention have the following beneficial effects:

[0065] 1. The outer protective shell 3 and the outer protective shell base plate 1 in this invention are both made of special steel with a thickness of more than 6mm. This can meet the impact resistance requirements of the outer protective shell 3 while also having good corrosion resistance in the marine environment, and allows the outer protective shell 3 to have a certain degree of corrosion during its service life.

[0066] 2. The outer protective shell 3 in this invention is set as a conical or gyroscope-shaped part with a bottom sharp angle of 60-90°, which can easily penetrate into the seabed soil layer and effectively prevent the piezometer 14 inside the outer protective shell 3 from being squeezed by external force, thus preventing the piezometer 14 from being squeezed, deformed and failing.

[0067] 3. The outer protective shell 3 of the present invention has a surface hole 6 and the inner part of the outer protective shell 3 is filled with a reverse filter structure layer, which can prevent fine soil particles from clogging the water inlet of the piezometer 14 during the service life, thus preventing the piezometer 14 from failing to measure, ensuring the formation of a continuous water head, and meeting the requirements for measuring the pore water pressure of the seabed.

[0068] 4. The present invention is equipped with a protective device for the piezometer. The piezometer 14 is installed on the marine engineering structure through the protective device and can be fixed by welding or other means, which effectively reduces the installation difficulty of the piezometer 14, ensures the installation quality of the piezometer 14, and is simple, convenient and quick to operate.

[0069] 5. The outer protective shell base plate 1 of the present invention is fastened to the outer protective shell 3 by the outer protective shell base plate mounting ears 7 and fixing bolts 2. The reverse filter structure layer is an independent component. When the reverse filter structure layer needs to be cleaned or replaced, the fixing bolts 2 can be removed to separate the outer protective shell base plate 1 and the outer protective shell 3, so that the reverse filter structure layer can be quickly removed and replaced, making the installation convenient and efficient.

[0070] 6. This invention is applicable to the protection method of piezometers that enter the seabed with marine engineering structures. The stainless steel outer protective shell 3 can prevent the impact of seabed boulders or structures from damaging the piezometer 14. The outer protective shell 3 is filled with multiple layers of materials to form a reverse filter structure layer, which can ensure that water entering the outer protective shell 3 does not affect the pore pressure measurement, and can also prevent the inlet of the piezometer 14 from being blocked.

[0071] Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0072] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A protection device for an osmometer, for protecting an osmometer (14); characterized in that: It comprises an outer protective shell (3), an outer protective shell bottom plate (1) and a reverse filtration structure layer, the outer protective shell bottom plate (1) is fixedly connected with the outer protective shell (3), and the reverse filtration structure layer is arranged in the space formed by the outer protective shell bottom plate (1) and the outer protective shell (3); The outer protective shell (3) and the outer protective shell bottom plate (1) form a gyroscope-shaped member, the outer peripheral curved surface of the outer protective shell (3) is in the shape of a curved surface with large diameters at both ends and a small diameter in the middle; wherein the curved surface with the small diameter in the middle and the curved surfaces with the large diameters at both ends form a cavity; when the gyroscope-shaped outer protective shell (3) is penetrated into the seabed, even if the seabed soil completely wraps the outer periphery of the outer protective shell (3), the cavity serves as a drainage path for the outer peripheral surface of the outer protective shell (3) to communicate with the outside, thereby ensuring that the pore water pressure in the seabed is transmitted to the inside of the outer protective shell (3) and measured by the osmometer (14); The reverse filtration structure layer comprises a reverse filtration barrier outer layer (8), a reverse filtration filler layer and a reverse filtration inner layer (13), the reverse filtration barrier outer layer (8) is a woven member composed of two layers of geotextiles and one layer of geogrids, and the geogrids are arranged between the two layers of geotextiles; the geotextiles are used to ensure the water permeability and anti-blocking property of the reverse filtration barrier outer layer (8), and the geogrids have a strength not less than 200KN, which is used to prevent the reverse filtration barrier outer layer (8) from being torn by external force; the osmometer (14) is arranged in the reverse filtration inner layer (13); the reverse filtration filler layer comprises a reverse filtration filler coarse particle layer (9) and a reverse filtration filler fine particle layer (11); and the reverse filtration structure layer is used to ensure that the water inlet of the osmometer (14) is unobstructed; The thickness of the outer protective shell (3) is greater than 6mm; and the thickness of the outer protective shell bottom plate (1) is not less than the thickness of the outer protective shell (3); The diameter of the outer protective shell bottom plate (1) is 1.5-3 times the length specification of the osmometer (14); the height of the outer protective shell (3) is 1-1.5 times the length specification of the osmometer (14), the osmometer (14) is arranged at the center position of the outer protective shell bottom plate (1), and there is a spacing between the osmometer (14) and the inner wall of the outer protective shell (3), so as to avoid the osmometer (14) from being extruded and deformed during the penetration process.

2. The protection device for an osmometer according to claim 1, characterized in that: A plurality of outer protective shell surface holes (6) are formed in the outer protective shell (3), the outer protective shell surface holes (6) make the inner space of the outer protective shell (3) communicate with the outside space; and an outer protective shell bottom plate mounting lug (7) is further arranged on the outer protective shell (3), and the outer protective shell bottom plate (1) is fixedly connected with the outer protective shell (3) through the outer protective shell bottom plate mounting lug (7).

3. The pressure monitor protection device of claim 1, wherein: An outer protective shell wire outlet hole (4) is further formed in the outer protective shell (3), and a cable (5) of the osmometer (14) is arranged in the outer protective shell wire outlet hole (4).

4. A method of manufacturing a protector for an osmometer, for manufacturing a protector for an osmometer according to any one of claims 1 to 3, characterized in that: The steps are as follows: S1: selecting raw materials to manufacture the outer protective shell (3) and the outer protective shell bottom plate (1); S2: selecting raw materials to manufacture the reverse filtration structure layer, and arranging the osmometer (14) in the reverse filtration structure layer; S3: filling the reverse filtration structure layer provided with the osmometer (14) into the outer protective shell (3), and connecting the outer protective shell (3) and the outer protective shell bottom plate (1).

5. A method of using the osmometer protection device according to any one of claims 1 to 3, characterized in that: The steps are as follows: A1: The outer protective shell (3) and the outer protective shell bottom plate (1) are placed in water to soak in a gyro shape until the osmometer (14) measures a stable reading and the water pressure measurement value matches the theoretical value; the protective device of the osmometer is fixed on the marine engineering mechanism, and the sharp corner direction of the outer protective shell (3) is downward; A2: The marine engineering mechanism works, and the outer protective shell (3) penetrates into the seabed downward and reaches the specified depth; A3: The osmometer (14) detects the change of the pore water pressure in the seabed.

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