A method for monitoring and calculating the inclination of a tank based on spiral point distribution

Abstract

The application discloses a tank inclination monitoring and calculating method based on spiral point arrangement, and relates to the technical field of foundation settlement. Compared with the prior art, the method adopts more reasonable measuring point arrangement positions, considers economic benefits and technical factors, and can cover the whole foundation base by using a small amount of measuring points. In the calculating method, points are regularly taken for calculation and linear fitting, so that errors caused by excessive or insufficient settlement of individual measuring points are avoided, and finally, the obtained result is consistent with engineering practice, and provides a reliable theoretical basis for subsequent maintenance work.

Description

Technical Field

[0001] This invention relates to the field of foundation settlement technology, specifically to a method for monitoring and calculating the tilt of a tank based on a spiral distribution of points. Background Technology

[0002] A mother-daughter tank refers to a storage tank consisting of multiple (three or more) inner containers (daughter tanks) connected in parallel and arranged in a specific pattern within an outer container (mother tank) filled with insulating material. It is generally designed and constructed to accommodate large-volume, pressurized storage. The inner container is a pressure vessel used to hold the medium, typically a vertical cylindrical structure with supporting legs. The outer container houses the inner containers and forms an annular insulating jacket with them; it is usually a cylindrical, flat-bottomed, domed structure. Under normal operating conditions, the metal structure and the liquid produced by the natural gas liquefaction unit exert significant loads on the foundation.

[0003] Large storage tanks, including mother and daughter tanks, are used to store engineering gases such as ethane. These tanks are tall and bear heavy loads. After being put into use, cracks and uneven settlement easily appear in the ground around the tank foundations, causing the tanks to tilt and posing a significant safety hazard. If an engineering gas leak occurs, the consequences would be unimaginable. Conventional settlement monitoring methods require numerous measuring points, involve complex calculations, and are difficult to obtain the overall tilt situation.

[0004] To address the problem of difficulty in accurately obtaining tank tilt information caused by uneven settlement of mother and daughter tanks, a tank tilt calculation method based on spiral point layout is proposed, which can obtain tilt information with only a small number of points. Summary of the Invention

[0005] The purpose of this invention is to provide a method for monitoring and calculating the tilt of a tank based on a spiral distribution of points, in order to solve the above problems.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0007] A method for monitoring and calculating the tilt of a tank based on a spiral layout includes a mother tank and a monitoring instrument. The monitoring instrument is a silicon pressure hydrostatic level. One monitoring instrument is installed next to the water tank as a reference point. Then, seven monitoring instruments are installed as monitoring points in the intersection area around the stress point of the bottom structure of the mother tank and at the center of the base. The monitoring points are connected to form a monitoring waterway.

[0008] After acquiring the detection data of each point in real time, a spatial rectangular coordinate system is established with the center 0 as the origin. After settlement occurs, the coordinate information of each measuring point is acquired, the monitoring points are grouped, and a plane is determined based on the coordinate points of each group. The normal vector of the plane is calculated and normalized to obtain the normal vector and coordinates of each plane.

[0009] The least squares method is used to fit an optimal plane to represent the global normal vector in order to obtain the global inclination. A linear model is then established using the plane equation.

[0010] Define a loss function Loss as the sum of squared distances from data points to the plane. Take the partial derivatives of this function with respect to a0, b0, and c0 respectively. The obtained... The value, which is the normal function of the fitted global plane, allows us to determine the overall tilt direction and angle.

[0011] Furthermore, the monitoring points are arranged as follows:

[0012] S1. According to the location of the concrete columns in the tank area, the bottom of the foundation of the mother and daughter tanks is divided into four concentric circles from small to large, namely circle A, circle B, circle C and circle D. A reference point 8 is set outside circle D. The reference point is placed on a stable horizontal base point as a monitoring reference plane. When the measuring point rises or falls relative to the reference point, it will cause the pressure at each point to change, thereby obtaining the rise and fall of each measuring point relative to the horizontal base point.

[0013] S2. Connect the reference point 8 to the center of the circle, and take the intersection of the line connecting the reference point 8 and the circle A as the monitoring point 1.

[0014] S3. Draw a straight line through monitoring point 1. This line intersects the line connecting reference point 8 and the center of the circle but is not perpendicular to it. The specific angle depends on the cable routing on site. This line intersects with circles B and C respectively. The two intersection points are used as monitoring point 2 and monitoring point 4.

[0015] S4. Take a point on circle B at one-third of the circumference from monitoring point 2 as monitoring point 3;

[0016] S5. On circle C, take a point symmetrical to monitoring point 4 with respect to the center of the circle as monitoring point 5;

[0017] S6, the intersection of the straight line connecting the reference point 8 and the center 0 of the circle with circle D is used as monitoring point 6 and monitoring point 7.

[0018] Furthermore, the monitoring waterway is connected in the order of reference point 8 → monitoring point 7 → monitoring point 2 → monitoring point 1 → monitoring point 4 → monitoring point 6 → monitoring point 3 → monitoring point 5. The seven monitoring instruments form a monitoring waterway. By continuously deploying seven monitoring waterways, real-time monitoring of the differential settlement of the mother and daughter tanks can be achieved.

[0019] Furthermore, after settlement occurs, the coordinate information of each measuring point is recorded as monitoring point 1 (x1, y1, z1), monitoring point 2 (x2, y2, z2), monitoring point 3 (x3, y3, z3), monitoring point 4 (x4, y4, z4), monitoring point 5 (x5, y5, z5), monitoring point 6 (x6, y6, z6), and monitoring point 7 (x7, y7, z7).

[0020] Five groups of monitoring points were selected: 123, 234, 345, 456, and 567. A plane was determined based on the coordinates of each group, and the normal vector of that plane was calculated.

[0021]

[0022] And normalize the normal vector: This allows us to obtain the normal vector of each plane. and The coordinates of each normal vector are

[0023] Furthermore, the coordinates of the global normal vector represented by the optimal plane are...

[0024] Furthermore, the equation of the plane is: a0*x + b0*y + c0*z = 1.

[0025] Furthermore, the loss function Loss is: Loss=∑(a0*a i +b0*b i +c0*c i -1) 2 Take the partial derivatives with respect to a0, b0, and c0:

[0026]

[0027]

[0028]

[0029] The beneficial effects of this invention are as follows: Compared with existing standard methods, it adopts a more reasonable arrangement of measuring points, taking into account both economic and technical factors, allowing a small number of measuring points to cover the entire foundation base. In terms of calculation methods, it systematically selects points for calculation and performs linear fitting, avoiding errors caused by excessively large or small settlement at individual measuring points. The final results are consistent with the actual engineering situation, providing a reliable theoretical basis for subsequent maintenance work. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the plane coordinates of the monitoring points of this invention;

[0031] Figure 2 This is a schematic diagram of the three-dimensional coordinates of the monitoring points in this invention; Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0035] As shown in the figure, a method for monitoring and calculating the tilt of a tank based on a spiral distribution includes a mother tank and a monitoring instrument. The tank foundation adopts a cast-in-place ring wall foundation made of C35 impact-resistant concrete and HPB300 and HRB400 grade steel bars. The monitoring instrument is a silicon pressure static level, which can be used for long-term field measurements and is also convenient for users to integrate into the system through secondary development. Multiple sensor channels can simultaneously demodulate sensors on multiple optical fibers or perform channel analysis. A highly integrated wireless transmission module is used to transmit all data to the client software testing system for monitoring and analysis, based on the field environment and data transmission conditions. This is used to monitor the relative settlement of multiple points, that is, the change of the vertical displacement of each measuring point relative to the corresponding reference point, so as to accurately calculate the relative settlement of each measuring point. In terms of data acquisition, the acquisition module comprehensively collects data from various sensors. The internal modular design allows for the connection of sensors according to different needs. It has a built-in storage chip, and the acquired data can be conveniently and securely stored in the memory of the acquisition unit.

[0036] For differential settlement monitoring at various points on the bottom foundation of the mother and daughter tanks, sensors were fixed to the base in the intersection area around the stress points of the bottom structure and at the center of the base. An FBG static leveling point was installed adjacent to the water tank as a reference point, and then seven monitoring instruments were installed as monitoring points. The arrangement of the monitoring points is as follows:

[0037] S1. According to the location of the concrete columns in the tank area, the bottom of the foundation of the mother and daughter tanks is divided into four concentric circles from small to large, namely circle A, circle B, circle C and circle D. A reference point 8 is set outside circle D. The reference point is placed on a stable horizontal base point as a monitoring reference plane. When the measuring point rises or falls relative to the reference point, it will cause the pressure at each point to change, thereby obtaining the rise and fall of each measuring point relative to the horizontal base point.

[0038] S2. Connect the reference point 8 to the center of the circle, and take the intersection of the line connecting the reference point 8 and the circle A as the monitoring point 1.

[0039] S3. Draw a straight line through monitoring point 1. This line intersects the line connecting reference point 8 and the center of the circle but is not perpendicular to it. The specific angle depends on the cable routing on site. This line intersects with circles B and C respectively. The two intersection points are used as monitoring point 2 and monitoring point 4.

[0040] S4. Take a point on circle B at one-third of the circumference from monitoring point 2 as monitoring point 3;

[0041] S5. On circle C, take a point symmetrical to monitoring point 4 with respect to the center of the circle as monitoring point 5;

[0042] S6, the intersection of the straight line connecting the reference point 8 and the center 0 of the circle with circle D is used as monitoring points 6 and 7.

[0043] Connect the monitoring waterways in the order of benchmark point 8 → monitoring point 7 → monitoring point 2 → monitoring point 1 → monitoring point 4 → monitoring point 6 → monitoring point 3 → monitoring point 5. Seven monitoring instruments form one monitoring waterway. Ensure the protective structure of the water tank and benchmark points is in place. By continuously deploying seven monitoring waterways, real-time monitoring of differential settlement between the mother and daughter tanks can be achieved.

[0044] The equipment needs to be placed in an underground monitoring room for flammable and explosive storage pipes. In order to ensure safe use in the event of a violent explosion, the selected equipment is a mining explosion-proof model, and all of them are equipped with explosion-proof boxes. All data can be collected in real time. During the flood season, rainy season, or when abnormal situations occur, the monitoring frequency must be increased. The specific monitoring frequency can be adjusted according to requirements.

[0045] like Figure 2 As shown, after acquiring the detection data of each point in real time, a spatial rectangular coordinate system is established with the center 0 as the origin. In the initial position, the seven measuring points and the leveling point are all on the same horizontal plane as the center of the circle, that is, the z value is 0. After settlement occurs, the coordinate information of each measuring point is acquired and recorded as monitoring point 1 (x1, y1, z1), monitoring point 2 (x2, y2, z2), monitoring point 3 (x3, y3, z3), monitoring point 4 (x4, y4, z4), monitoring point 5 (x5, y5, z5), monitoring point 6 (x6, y6, z6), and monitoring point 7 (x7, y7, z7).

[0046] Five groups of monitoring points were selected: 123, 234, 345, 456, and 567. A plane was determined based on the coordinates of each group, and the normal vector of that plane was calculated.

[0047]

[0048] And normalize the normal vector: This allows us to obtain the normal vector of each plane. and The coordinates of each normal vector are

[0049] Finally, the least squares method is used to fit an optimal plane representing the global normal vector to obtain the global slope. A linear model is then established using the plane equation, and the coordinates of its normal vector are... The equation of the plane is: a0*x + b0*y + c0*z = 1. A loss function, Loss, is defined as the sum of the squared distances from data points to the plane: Loss = ∑(a0*a...) i +b0*b i +c0*c i -1) 2 Let the function take partial derivatives with respect to a0, b0, and c0 respectively, then we have:

[0050]

[0051]

[0052]

[0053] The above formula can be used to obtain The value, which is the normal function of the fitted global plane, allows us to determine the overall tilt direction and angle.

[0054] Combined with a remote automatic settlement monitoring system, it provides functions such as report generation and real-time monitoring alarms. At the same time, all raw data is recorded in the cloud and can be accessed and viewed at any time, ensuring that the data is never lost.

[0055] The foregoing has shown and described 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 embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by the present invention is defined by the claims and their equivalents.

Claims

1. A method for monitoring and calculating the tilt angle of a tank based on a spiral distribution of monitoring points, characterized in that, It includes a mother tank and a monitoring instrument. The monitoring instrument is a silicon pressure hydrostatic level. One monitoring instrument is installed next to the water tank as a reference point. Then, seven monitoring instruments are installed as monitoring points in the intersection area around the stress point of the bottom structure of the mother tank and the center of the base. The monitoring points are connected to form a monitoring waterway. After acquiring the detection data of each point in real time, a spatial rectangular coordinate system is established with the center 0 as the origin. After settlement occurs, the coordinate information of each measuring point is acquired, the monitoring points are grouped, and a plane is determined based on the coordinate points of each group. The normal vector of the plane is calculated and normalized to obtain the normal vector and coordinates of each plane. The least squares method is used to fit an optimal plane to represent the global normal vector in order to obtain the global inclination. A linear model is then established using the plane equation. Define a loss function Loss to represent the sum of squares of the distances from the data points to the plane. Take the partial derivative of this function with respect to the coordinates of the normal vector of the whole plane that best represents the plane, and obtain the normal function of the fitted whole plane. Then you can know the overall tilt direction and tilt angle. The monitoring points are arranged as follows: S1. According to the location of the concrete columns in the tank area, the bottom of the foundation of the mother and daughter tanks is divided into four concentric circles from small to large, namely circle A, circle B, circle C and circle D. A reference point 8 is set outside circle D. The reference point is placed on a stable horizontal base point as a monitoring reference plane. When the measuring point rises or falls relative to the reference point, it will cause the pressure at each point to change, thereby obtaining the rise and fall of each measuring point relative to the horizontal base point. S2. Connect the reference point 8 to the center of the circle, and take the intersection of the line connecting the reference point 8 and the circle A as the monitoring point 1. S3. Draw a straight line through monitoring point 1. This line intersects the line connecting reference point 8 and the center of the circle but is not perpendicular to it. The specific angle depends on the cable routing on site. This line intersects with circles B and C respectively. The two intersection points are used as monitoring point 2 and monitoring point 4. S4. Take a point on circle B at one-third of the circumference from monitoring point 2 as monitoring point 3; S5. On circle C, take a point symmetrical to monitoring point 4 with respect to the center of the circle as monitoring point 5; S6, the intersection of the straight line connecting the reference point 8 and the center 0 of the circle with circle D is used as monitoring point 6 and monitoring point 7.

2. The method for monitoring and calculating tank tilt based on spiral point layout according to claim 1, characterized in that, The monitoring waterway is connected in the order of reference point 8 → monitoring point 7 → monitoring point 2 → monitoring point 1 → monitoring point 4 → monitoring point 6 → monitoring point 3 → monitoring point 5. Seven monitoring instruments form a monitoring waterway. By continuously deploying seven monitoring waterways, real-time monitoring of differential settlement between the mother and daughter tanks can be achieved.

3. The method for monitoring and calculating tank tilt based on spiral point layout according to claim 2, characterized in that, After settlement occurs, the coordinate information of each measuring point is recorded as monitoring point 1 (x1, y1, z1), monitoring point 2 (x2, y2, z2), monitoring point 3 (x3, y3, z3), monitoring point 4 (x4, y4, z4), monitoring point 5 (x5, y5, z5), monitoring point 6 (x6, y6, z6), and monitoring point 7 (x7, y7, z7). Five groups of monitoring points were selected: 123, 234, 345, 456, and 567. A plane was determined based on the coordinates of each group, and the normal vector of that plane was calculated. ； And normalize the normal vector: This allows us to obtain the normal vector of each plane. , , , and The coordinates of each normal vector are .

4. The method for monitoring and calculating tank tilt based on spiral point layout according to claim 3, characterized in that, The optimal plane represents the coordinates of the global normal vector. .

5. The method for monitoring and calculating tank tilt based on spiral point layout according to claim 4, characterized in that, The equation of the plane is: The loss function Loss is respectively for , and Find the partial derivative, and obtain the result. value.

6. The method for monitoring and calculating tank tilt based on spiral point layout according to claim 5, characterized in that, The loss function Loss is: ,right , and Find the partial derivative: ； ； ； obtained The value is the normal function of the fitted global plane.

Images