A device for monitoring building tilt angle changes based on double square signs

Abstract

The present invention discloses a device for monitoring changes in building tilt angles based on double square markings, comprising a white side panel, the white side panel being fixed to the side of the monitored building via bolts at its four corners, a straight metal rod being provided at the center of the top of the white side panel, the straight metal rod being vertically fixed to the white side panel, one end of the straight metal rod being tied with a black string perpendicular to the horizontal plane, the bottom of the black string being tied with a plumb bob, and a black square marking body being affixed to both the left and right sides of the black string. The present invention relates to the technical field of monitoring changes in building tilt angles. The device for monitoring changes in building tilt angles based on double square markings has a simple structure, is easy to use, and is low in cost. It realizes automatic and real-time monitoring of changes in building tilt angles, and has the advantages of high sensitivity and fast response speed.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring changes in building tilt angles, and in particular to a device for monitoring changes in building tilt angles based on double square marks. Background Art

[0002] Tilt and deformation of buildings during construction and operation are normal and permitted within certain limits. However, if the designed deformation limit is exceeded, the tilt and deformation will affect the normal use of the building and endanger its safety. Therefore, during construction and operation, it is necessary to monitor the building to understand its deformation status, deformation trends, and the relationship between deformation and deformation factors to ensure that the building remains safe.

[0003] Currently, there are two methods for monitoring changes in building tilt angles: the total station method and the three-dimensional scanning method. However, in actual applications, the total station method requires expensive equipment, a large amount of manpower, and valuable time, and is limited by observation conditions, resulting in low observation efficiency and a large number of error factors. The three-dimensional scanning method requires a high-precision scanner and a good monitoring environment, and external interference will have a significant impact on the scanning results. For real-time dynamic monitoring, both the total station method and the three-dimensional scanning method are difficult to implement. Square signs have the advantages of being simple to make, low cost, and easy to paste, and have been widely used in the field of monitoring changes in building cracks. However, there is currently no practice of using square signs to monitor changes in building tilt angles. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the present invention provides a device for monitoring the change of building tilt angle based on double square marks, which solves the problems of complex structure, inconvenience in use and high cost of existing building tilt angle change monitoring.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for monitoring the change of the inclination angle of a building based on a double square mark, comprising a white side panel, which is fixed to the side of the monitored building by bolts at its four corners, a straight metal rod is provided in the center of the top of the white side panel, the straight metal rod is vertically fixed to the white side panel, one end of the straight metal rod is tied with a black rope perpendicular to the horizontal plane, the bottom of the black rope is tied with a plumb bob, and a black square mark body is pasted on both sides of the left and right sides of the black rope.

[0008] One end of the straight metal rod away from the black rope is fixedly connected to a Y-shaped metal rod, and the bottom of the Y-shaped metal rod is fixedly connected to a wireless transmission camera. The signal output end of the wireless transmission camera is electrically connected to the signal input end of the computer.

[0009] Preferably, the white side panels are made of PVC sheets.

[0010] Preferably, the linear metal rod is in the shape of a hollow cylinder, and a ring is provided at the top end of the Y-shaped metal rod, and the ring is fixed to the end of the linear metal rod by a fixing bolt.

[0011] Preferably, the lens direction of the wireless transmission camera is perpendicular to the white side panel.

[0012] Preferably, the side length of the black square sign is 20-25 mm.

[0013] Preferably, the computer uses MATLAB software to perform grayscale conversion, binarization, morphology, noise removal, region segmentation and pixel calibration processing on the acquired image to obtain the building tilt angle change value at each monitoring moment.

[0014] (3) Beneficial effects

[0015] The present invention provides a device for monitoring changes in building tilt angles based on double square signs. It has the following beneficial effects:

[0016] This device for monitoring building tilt angle changes based on double square signs transmits the images of the position changes of two black square signs relative to the black rope at different monitoring moments to a computer through a wireless transmission camera. The MATLAB software in the computer then performs grayscale conversion, binarization, morphology, noise removal, region segmentation and pixel calibration on the images at each moment, thereby obtaining the building tilt angle change value at each monitoring moment.

[0017] In summary, the present invention has a simple structure, is easy to use, and has low cost. It can automatically and real-timely monitor changes in the tilt angle of a building and has the advantages of high sensitivity and fast response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the connection between the straight metal rod and the Y-shaped metal rod of the present invention;

[0020] Figure 3 This is a schematic diagram showing the principle of calculating the tilt angle change of the present invention;

[0021] Figure 4This is a flow chart of monitoring and image processing of the present invention;

[0022] Figure 5 This is the pixel value distribution diagram after image processing of the present invention.

[0023] In the figure: 1. White side panel; 2. Straight metal rod; 3. Black square sign; 4. Black string; 5. Plumb bob; 6. Y-shaped metal rod; 61. Ring; 62. Fixing bolt; 7. Wireless transmission camera; 8. Computer. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, the present invention provides a technical solution: a device for monitoring changes in building inclination angles based on double square signs, comprising a white side panel 1, a straight metal rod 2, a black square sign body 3, a black string 4, a plumb bob 5, a Y-shaped metal rod 6, a wireless transmission camera and a computer 8.

[0026] like Figure 1-2 As shown, the white side panel 1 is made of PVC sheet material, and the white side panel 1 is fixed to the side of the monitored building by bolts at its four corners. A straight metal rod 2 is provided in the center of the top of the white side panel 1, and the straight metal rod 2 is vertically fixed to the white side panel 1. The straight metal rod 2 is a hollow cylindrical shape, and a ring 61 is provided at the top of the Y-shaped metal rod 6, which is fixed to the end of the straight metal rod 2 by a fixing bolt 62.

[0027] like Figure 1 As shown, one end of the straight metal rod 2 is tied with a black rope 4 perpendicular to the horizontal plane, the bottom of the black rope 4 is tied with a plumb bob 5, and a black square sign 3 is pasted on both sides of the black rope 4. The side length of the black square sign 3 is 20-25 mm.

[0028] like Figure 1 As shown, the end of the straight metal rod 2 away from the black rope 4 is fixedly connected to a Y-shaped metal rod 6, and the bottom of the Y-shaped metal rod 6 is fixedly connected to a wireless transmission camera 7. The lens direction of the wireless transmission camera 7 is perpendicular to the white side panel 1, and the signal output end of the wireless transmission camera 7 is electrically connected to the signal input end of the computer 8.

[0029] like Figure 3-5As shown, the computer 8 uses MATLAB software to perform grayscale conversion, binarization, morphology, noise removal, region segmentation and pixel calibration on the acquired image to obtain the building tilt angle change value at each monitoring moment.

[0030] The pixel of the wireless transmission camera 7 is not less than 10 million, and the distance H between the lens and the white side panel 1 satisfies the formula:

[0031] H≤0.02m*f / (10*a) (1)

[0032] 0.02m is the side length of the black square sign 3, f is the focal length of the camera lens, in mm; a is the camera pixel size, in mm, and the black square sign 3 and the black rope 4 photographed by the wireless transmission camera 7 are clear.

[0033] When using, Figure 3 As shown, first install the white side panel 1 on the surface of the monitored building, paste two black square signs 3 on both sides of the black rope 4, then install and debug the wireless transmission camera 7. The time when the wireless transmission camera 7 takes the first image after installation is recorded as time t0. Use the wireless transmission camera 7 to obtain the image of the black square sign 3 and the black rope 4 at time t0, as shown in the figure below. Figure 4 a, and transmit the image to the computer 9.

[0034] Computer 9 uses MATLAB software to perform image grayscale, binarization, morphology, elimination of isolated points or blocks, region segmentation and pixel calibration. After the image is processed, each pixel value is as follows: Figure 5 As shown, the pixel value in the black square marker 3 area on the left is 1, the pixel value in the black string 4 area is 2, and the pixel value in the black square marker 3 area on the right is 3. Based on the distribution of each area, the coordinates of the four corner points of a single black square marker 3 can be calculated, and then the perimeter Z of a single black square marker 3 can be obtained. The actual length of a single pixel in the image is θ = 8*20mm / (2*Z). The distance between point 1C and point 2A does not change with the tilt of the building. The actual distance is a constant value Ds1C2A, Ds1C2A is

[0035]

[0036] like Figure 4 As shown in d, line segment 2AE0⊥line segment HG0, line segment 1CG0⊥line segment HG0, the length of line segment 2AE0 and the length of line segment 1CG0 can be obtained by calculating the distance from the point to the straight line, which are Ds2AE0 and Ds1CG0 respectively. The right triangle G01CF0 is similar to the right triangle E02AF0, so

[0037]

[0038] Ds2AF0=Ds1C2A-Ds1CF0 (4)

[0039] The value of Ds1CF0 can be calculated. Then the value of ∠G01CF0 at time t0 is:

[0040]

[0041] The wireless transmission camera 7 obtains the image of the black square sign 3 and the black string 4 every 1 second. At time tn, the wireless transmission camera 7 obtains the image of the black square sign 3 and the black string 4 as shown in FIG4b. Figure 4 c shows the projection position of the black string 4 on the white side panel 1 at time t0 and time tn, and ∠GnHG0 is the change in the building's tilt angle from time t0 to time tn. According to the principle of similarity of right triangles, we know that

[0042] ∠Gn1CG0=∠GnHG0=∠Gn1CFn-∠G01CF0 (6).

[0043] In summary, the device for monitoring changes in building tilt angles based on double square marks has a simple structure, is easy to use, and has low cost. It realizes automatic and real-time monitoring of changes in building tilt angles and has the advantages of high sensitivity and fast response speed.

[0044] It should be noted that the electrical components appearing in this article are all electrically connected to an external main controller, and the main controller can be a conventional known device that controls a computer, etc. Its control principle, internal structure, and control switch mode are all conventional means of the prior art, which are directly quoted here without further elaboration. In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for monitoring building tilt angle changes based on double square marks, characterized by: The invention comprises a white side panel (1), wherein the white side panel (1) is fixed to the side of the monitored building by bolts at its four corners, a straight metal rod (2) is provided at the center of the top of the white side panel (1), the straight metal rod (2) is vertically fixed to the white side panel (1), one end of the straight metal rod (2) is fastened with a black string (4) perpendicular to the horizontal plane, the bottom of the black string (4) is fastened with a plumb bob (5), and a black square sign (3) is attached to both the left and right sides of the black string (4); One end of the straight metal rod (2) away from the black string (4) is fixedly connected to a Y-shaped metal rod (6), the bottom of the Y-shaped metal rod (6) is fixedly connected to a wireless transmission camera (7), and the signal output end of the wireless transmission camera (7) is electrically connected to the signal input end of the computer (8).

2. The device for monitoring building tilt angle changes based on double square marks according to claim 1, characterized in that: The white side panels (1) are made of PVC sheets.

3. The device for monitoring building tilt angle changes based on double square marks according to claim 1, characterized in that: The linear metal rod (2) is in the shape of a hollow cylinder. The top end of the Y-shaped metal rod (6) is provided with a circular ring (61), which is fixed to the end of the linear metal rod (2) by a fixing bolt (62).

4. The device for monitoring building tilt angle changes based on double square marks according to claim 1, characterized in that: The lens direction of the wireless transmission camera (7) is perpendicular to the white side panel (1).

5. The device for monitoring building tilt angle changes based on double square marks according to claim 1, characterized in that: The side length of the black square sign (3) is 20-25 mm.

6. The device for monitoring building tilt angle changes based on double square marks according to claim 1, characterized in that: The computer (8) uses MATLAB software to perform grayscale conversion, binarization, morphology, noise removal, region segmentation and pixel calibration processing on the acquired image to obtain the building tilt angle change value at each monitoring moment.

Images