Detection method for evaluating falling risk of exterior wall facing layer

Abstract

The invention relates to the technical field of house outer wall facing layer potential safety hazard detection, in particular to a detection method for evaluating the falling risk of an outer wall facing layer. The method comprises the following steps: a modeling step, an acquisition step, a preliminary acquisition step, a preliminary judgment step, a hollowing number acquisition step, a preliminary judgment step, a risk value calculation step, a risk judgment step, an alarm step and a processing suggestion step. The method has the effect of improving the accuracy of outer wall facing layer falling risk detection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety hazard detection of the outer wall finish layer of a building, in particular to a detection method for risk assessment of the outer wall finish layer falling off. BACKGROUND

[0002] At present, with the development of urbanization in China, a large number of existing buildings enter the maintenance stage, among which the outer wall finish layer as the outer layer of the building is particularly seriously damaged under the action of wind and rain, day and night temperature difference; in order to detect the safety hazards existing in the outer wall finish layer of the building, the visual method, touch inspection, photographic comparison and sampling inspection of key components of the outer wall system are usually used at present. These methods can find some defects of the outer wall to some extent, but have many limitations. For example, although the visual method is simple and fast, it is limited by the experience and subjective judgment of the detection personnel, and it is difficult to find defects with high concealment; touch inspection needs to be operated on high places, which has great safety risk; photographic comparison needs to be compared before and after, which requires high requirements for time and data recording; and sampling inspection is accurate, but it will cause damage to the building and has high cost.

[0003] In addition, with the continuous increase of the number of high-rise buildings, the traditional detection method is also insufficient in efficiency and coverage. The outer wall of the high-rise building is large in area and complex in structure, and is limited by the detection space and angle, so that the traditional method is difficult to accurately detect the falling risk of the outer wall finish layer, and the conclusion of the traditional detection method is relatively fuzzy, lacks a quantitative identification method, and the precision of the detection and evaluation result needs to be improved. SUMMARY

[0004] In order to improve the accuracy of the falling risk detection of the outer wall finish layer, the present application provides a detection method for risk assessment of the outer wall finish layer falling off.

[0005] The detection method for risk assessment of the outer wall finish layer falling off provided by the present application adopts the following technical scheme:

[0006] A detection method for risk assessment of the outer wall finish layer falling off, comprising the following steps:

[0007] Modeling: establishing a three-dimensional coordinate model of the building according to the original coordinates of the building;

[0008] Preliminary acquisition: acquiring an initial image of the outer wall finish layer of the building, acquiring a plurality of collected coordinate points, and acquiring an existing image of the outer wall finish layer of the building;

[0009] Second acquisition: analyzing the hollowing and cracking positions of the outer wall finish layer, calculating the coordinates of the hollowing and cracking outer edges, and acquiring the areas of the hollowing and cracking

[0010] Preliminary judgment: judge the area of hollowing and cracking whether it is greater than the set hollowing area threshold If yes, execute the hollowing number acquisition step;

[0011] Hollowing number acquisition: acquire the area of hollowing and cracking greater than the set hollowing area threshold the number of hollowing and cracking within the hollowing and cracking radius R range;

[0012] Second judgment: judge the number of hollowing and cracking whether it is greater than the preset hollowing and cracking threshold K0, if yes, execute the risk value calculation step;

[0013] Risk value calculation: acquire the area of hollowing and cracking greater than the set hollowing area threshold the total area of all hollowing and cracking within the hollowing and cracking radius range , the hollowing and cracking risk value calculation model is as follows:

[0014] In the formula, is the radiation area of hollowing and cracking, J>1, F0 is the basic risk value,

[0015] Risk judgment: judge whether the risk value is greater than the preset first risk threshold if yes, execute the alarm step, otherwise, execute the treatment suggestion step;

[0016] Alarm: notify the relevant personnel, release the risk degree, and send the risk point coordinates;

[0017] Treatment suggestion: set a period to monitor the development of the decorative layer hollowing and cracking, or suggest timely repair

[0018] ​By adopting the above technical solution, the original building coordinates are first obtained to establish a three-dimensional coordinate model of the building, and the initial image of the building's exterior wall finish is acquired. Then, the positions of multiple fixed acquisition points are obtained to correct the three-dimensional coordinates. The existing image of the building's exterior wall finish is then acquired. Next, the area of ​​hollow areas and cracks is calculated, and after comparison, the location of the point with the largest hollow and crack area exceeding a set value is determined. The number of hollow areas and cracks within the radius S of the largest hollow and crack area is obtained. Then, a preliminary judgment step is performed to determine whether the number of hollow areas and cracks exceeds a preset threshold value. If so, a risk calculation step is performed. The risk value is calculated using a risk value calculation model, and then a risk assessment is performed to determine if the risk value exceeds a set first risk threshold. If it does, an alarm is triggered, and relevant personnel are notified to carry out repairs to reduce the occurrence of accidents. Otherwise, the suggested handling steps are executed. The risk value is checked multiple times to detect risks in a timely manner. Different handling methods are used for different risk ratings, mainly including: timely repair, handling suggestions, and observation and use. Through the above methods, the risk of potential falling of the exterior wall cladding layer can be monitored in a timely manner, the risk of falling can be detected in time, the accidents caused by falling exterior wall cladding can be reduced, thereby improving safety, preventing problems before they occur, and further reducing the occurrence of accidents.

[0019] Optionally, a distance monitoring step is included between the preliminary judgment step and the risk value calculation step.

[0020] Distance monitoring: to obtain the area of ​​hollow areas and cracks. Greater than the set critical value for hollow area The distance between the hollow areas and cracks and the hollow areas and cracks within the radius S. Determine distance Is it less than the distance threshold? If hollowness and cracking are found, then the distance statistics step is executed; otherwise, the risk value calculation step is executed.

[0021] Distance statistics: Get distance Less than the distance threshold The number of hollows and cracks And execute the first risk update step;

[0022] First risk update: Intervene in the risk value calculation process; the updated risk value calculation model is as follows:

[0023]

[0024] In the formula, the calculation model for z is as follows:

[0025] In the formula, Distance Less than the distance threshold The allowed number of hollowing and cracking.

[0026] By adopting the technical scheme, the distance of the maximum hollowing and cracking is obtained through distance monitoring, it is judged whether there is hollowing and cracking with a distance less than the distance threshold, if yes, the distance statistical step is executed to obtain the number of hollowing and cracking with a distance less than the distance threshold, the risk calculation model is updated, the intervention of the distance is added, the connection and expansion of multiple hollowing and cracking are reduced, the risk is found in time, the falling of the outer wall facing caused by the sudden connection of the outer wall facing is reduced, the falling is suppressed in time, and the occurrence of accidents is reduced.

[0027] Optionally, a cross judgment step is further arranged between the preliminary judgment step and the risk value calculation step,

[0028] Cross judgment: whether the adjacent area maximum hollowing and cracking exist cross is obtained, if yes, the alarm step is executed, otherwise, the risk value calculation step is executed.

[0029] By adopting the technical scheme, the mutual relationship between the hollowing and cracking is further defined through the cross judgment step, the risk of the connection between the adjacent area maximum hollowing and cracking is strengthened, the risk is found in time, the accuracy of risk identification is increased, the safety is improved, and the occurrence of accidents is reduced.

[0030] Optionally, a cross intervention judgment step is further arranged between the cross judgment step and the alarm step;

[0031] Cross intervention judgment: whether the cross area is greater than a preset upper limit value of the cross area If yes, the alarm step is executed, otherwise, the second risk updating step is executed;

[0032] Second risk updating: the risk value calculation step is intervened, and the calculation model of the risk value is updated as follows:

[0033] By adopting the technical scheme, the radiation area with the cross is further distinguished, the situation that the connection or interaction may exist or the connection or interaction does not exist is distinguished, the adjustment of the risk value is more accurate, the processing of the risk with unnecessary or poor urgency is reduced, the accuracy of risk identification is improved, the safety is improved, and the occurrence of accidents is reduced.

[0034] Optionally, a multi-point cross judgment step is further arranged between the cross intervention judgment step and the second risk updating step;

[0035] Multi-point cross judgment: whether multiple area maximum hollowing and cracking exist cross is judged, if yes, the alarm step is executed, otherwise, the second risk updating step is executed.

[0036] By adopting the above technical solution, when the high-risk area with the largest area of hollowing and cracking and the radiation area exist intersection, the warning step is executed, if not, the second risk updating step is executed, by further distinguishing the type of intersection, further distinguishing the special case, further improving the accuracy of risk identification, improving the safety, and reducing the occurrence of accidents.

[0037] Optionally, between the preliminary judgment step and the risk value calculation step, an environment judgment step is further arranged;

[0038] Environment judgment: judging whether the environment is changeable, if yes, the first weighting step is executed, otherwise, the risk value calculation step is executed;

[0039] First weighting: intervening the risk value calculation step, updating the calculation model of the risk value as follows:

[0040]

[0041] In the formula, D is an adjustment parameter, and D>1.

[0042] By adopting the above technical solution, the environment of the house is monitored, whether the environment is changeable is determined according to the historical environment, if yes, the falling of the outer wall facing layer may be accelerated, then the calculation of the risk value is increased, according to the actual environment, the risk monitoring is further distinguished, the risk identification accuracy is improved, the safety is improved, and the occurrence of accidents is reduced.

[0043] Optionally, between the preliminary judgment step and the risk value calculation step, a height judgment step is further arranged;

[0044] Height judgment: judging whether the area of the hollowing and cracking is greater than the set hollowing area critical value whether the height of the hollowing and cracking is greater than the preset height limit value if yes, the second weighting step is executed, otherwise, the risk value calculation step is executed;

[0045] Second weighting: intervening the risk value calculation step, updating the calculation model of the risk value as follows:

[0046]

[0047] By adopting the technical scheme, with the increase of the height, many indexes such as air pressure, wind speed and temperature change, and therefore the risks of the hollowing and cracking existing at different heights continue to expand are different, and therefore the risk value calculation model is adjusted, the calculation of the risk value is further optimized, the accuracy of the risk value calculation is improved, the accuracy of the risk identification is improved, the safety is improved, and the occurrence of accidents is reduced.

[0048] In summary, the present application has at least one of the following beneficial technical effects:

[0049] 1. First, the original house coordinates are acquired, a three-dimensional coordinate model of the house is established, and an initial image of the outer wall facing layer of the house is acquired, then the positions of a plurality of fixed collection points are acquired for correcting the three-dimensional coordinates, an existing image of the outer wall facing layer of the house is acquired, then the hollowing and cracking area is calculated, and after comparison, the position of the maximum hollowing and cracking area greater than a set value is determined, the number of hollowing and cracking within the hollowing and cracking radius S of the maximum area is acquired, then a preliminary judgment step is executed to determine whether the number of hollowing and cracking is greater than a preset hollowing and cracking threshold value, if yes, a risk calculation step is executed to calculate the risk value according to the risk value calculation model, then a risk judgment is performed to determine whether the risk value is greater than a set first risk threshold value, if yes, an alarm is given to notify relevant personnel to repair and handle, thereby reducing accidents, otherwise, a processing suggestion step is executed to detect the risk value multiple times to discover the risk in time; by the above method, the risk of falling of the outer wall facing layer can be monitored in time, the falling risk can be discovered in time, the accidents caused by falling of the outer wall facing layer are reduced, the safety is improved, and compared with manual monitoring and calculation, the accuracy is higher, the possibility of human error is reduced, the accuracy of risk monitoring is improved, accidents are prevented in time, the occurrence of accidents is further reduced, and by setting the multiple collection coordinate points, the influence of weather on image collection is reduced, and the accuracy of monitoring is further improved.

[0050] 2. By distance monitoring, the distance of the maximum hollowing and cracking is acquired, it is determined whether there is hollowing and cracking with a distance less than a distance threshold value, if yes, a distance statistical step is executed to acquire the number of hollowing and cracking with a distance less than the distance threshold value, the risk calculation model is updated, the intervention of distance is added, the connection and expansion of multiple hollowing and cracking are reduced, the risk is discovered in time, the sudden connection of the outer wall facing layer is reduced, the falling of the outer wall facing layer is suppressed in time, and the occurrence of accidents is reduced.

[0051] 3. With the increase of the height, many indexes such as air pressure, wind speed and temperature change, and therefore the risks of the hollowing and cracking existing at different heights continue to expand are different, and therefore the risk value calculation model is adjusted, the calculation of the risk value is further optimized, the accuracy of the risk value calculation is improved, the accuracy of the risk identification is improved, the safety is improved, and the occurrence of accidents is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 This is a flowchart of the risk monitoring method in the embodiments of this application. Detailed Implementation

[0053] The following combination Figure 1 This application will be described in further detail.

[0054] This embodiment discloses a detection method for assessing the risk of exterior wall cladding layer detachment.

[0055] Reference Figure 1 The detection method for assessing the risk of exterior wall cladding peeling includes the following steps:

[0056] Modeling: Based on the original coordinates of the building, establish a three-dimensional coordinate model of the building;

[0057] Specifically, a three-dimensional coordinate model is established based on the original coordinate information during the building construction, the coordinate information after the completion and acceptance of the exterior wall cladding layer, the structural construction detection coordinate data of the exterior wall cladding layer, the leveling layer, and the adhesive layer, as well as the base point coordinate information. The acquisition of the original coordinates of the building includes building facade surveying, integrity and damage inspection survey, typical structural sampling inspection, infrared hollowing survey, manual tapping sampling inspection, three-dimensional scanning measurement, and typical area cladding pull-out. Then, the three-dimensional coordinate model is established based on the coordinate information.

[0058] Preliminary acquisition: Acquire the initial image of the building's exterior wall finish, acquire the coordinates of multiple acquisition points, and acquire the existing image of the building's exterior wall finish;

[0059] Specifically, the initial image of the building's exterior wall can be obtained after acceptance, and multiple base points can be marked and coordinate points collected for subsequent coordinate correction. Existing images can be obtained by taking depth image information through drone photography, and then data analysis can be performed based on the depth image information.

[0060] Further analysis: Analyze the locations of hollow areas and cracks in the exterior wall finish, calculate the coordinates of the outer edges of the hollow areas and cracks, and obtain the area of ​​the hollow areas and cracks.

[0061] Preliminary assessment: Determine the area of ​​hollow areas and cracks. Is it greater than the set critical value for the hollow area? If so, proceed with the step of obtaining the number of empty drums;

[0062] Hollow Area Count: Obtain the area of ​​hollow areas and cracks. Greater than the set critical value for hollow area The number of hollows and cracks within the radius R of the hollows and cracks;

[0063] Specifically, according to the information of the depth image, the positions and edge information of the hollowing and cracking are determined, and the area calculation is performed. The area calculation method can adopt integral method, geometric approximation method or grid method. The embodiment preferably adopts the grid method to perform calculation, and then it is judged whether the area of the hollowing and cracking is greater than a set hollowing area threshold value If yes, the number of the hollowing and cracking greater than the set hollowing area threshold value is counted; wherein the value of the set hollowing area threshold value is determined according to the critical area of the possible falling of the historical same material facing layer, or is obtained by mean value attenuation calculation on the critical area of the falling.

[0064] Again, it is judged whether the number of the hollowing and cracking is greater than a preset hollowing and cracking threshold value K0. If yes, a risk value calculation step is performed.

[0065] Risk value calculation: the area of the hollowing and cracking greater than the set hollowing area threshold value is obtained, and the total area of all the hollowing and cracking in the radius range of the hollowing and cracking greater than the set hollowing area threshold value The hollowing and cracking risk value calculation model is as follows:

[0066] In the formula, is the radiation area of the hollowing and cracking, J>1, F0 is a basic risk value,

[0067] Risk judgment: it is judged whether the risk value is greater than a preset first risk threshold value If yes, an alarm step is performed, otherwise, a treatment suggestion step is performed.

[0068] Alarm: relevant personnel are notified, the risk degree is issued, and the risk point coordinates are sent.

[0069] Treatment suggestion: a period is set to monitor the development of the hollowing and cracking of the facing layer, or timely repair is suggested.

[0070] Specifically, the risk value is calculated through the number and total area of the hollowing and cracking, the basic risk value is adjusted up through the range area and the area of the hollowing and cracking, the risk value calculation is completed, the risk value calculation is more in line with the falling situation of the real facing layer, then the risk value judgment is performed, whether the alarm step needs to be performed or the treatment suggestion is performed, and the occurrence of risk accidents is reduced; wherein the value is determined according to the historical falling accidents or falling situations, The radiation area for hollowness and cracking refers to the area of ​​a circle with radius S. The radius is determined based on the historical connection radius of hollowness and cracking, and the radiation area is determined accordingly. F0 is the basic risk value calculated and determined by the historical minimum number of hollowness and cracking detachments. The critical value for hollowness and cracking, K0, is obtained by the average number of hollowness and cracking detachments that begin to connect in historical detachment accidents. The value of J is determined based on the adhesion force between the finishing layer and the wall. In this embodiment, the value of J is 1.3.

[0071] In other embodiments, a distance monitoring step is also provided between the preliminary judgment step and the risk value calculation step.

[0072] Distance monitoring: to obtain the area of ​​hollow areas and cracks. Greater than the set critical value for hollow area The distance between the hollow areas and cracks and the hollow areas and cracks within the radius S. Determine distance Is it less than the distance threshold? If hollowness and cracking are found, then the distance statistics step is executed; otherwise, the risk value calculation step is executed.

[0073] Distance statistics: Get distance Less than the distance threshold The number of hollows and cracks And execute the first risk update step;

[0074] First risk update: Intervene in the risk value calculation process; the updated risk value calculation model is as follows:

[0075]

[0076] In the formula, the calculation model for z is as follows:

[0077] In the formula, Distance Less than the distance threshold The allowable number of hollow areas and cracks.

[0078] Specifically, when the distance between hollow areas and cracks is too close, there is a possibility that two hollow areas and cracks may quickly connect, causing the area of ​​the hollow areas and cracks to suddenly increase, thus increasing the risk of falling. The distance between the hollow areas and cracks is used to determine if it is less than a critical distance value. Then, the number of distances less than the critical distance value is counted, and the risk value calculation model is updated before proceeding with the risk assessment step. The critical distance value... The risk value is determined based on the distance from the beginning of the connection between adjacent hollow areas and cracks in the past, or it can be adjusted based on the material of the finishing layer and the material of the wall. Furthermore, it is calculated based on historical data, which makes the risk value calculation more accurate and facilitates the timely detection of risks. Distance Less than the distance threshold The allowable quantity of hollow areas and cracks. The determination is based on the minimum number of voids and cracks that begin to connect within a radius S in historical data.

[0079] In other embodiments, a cross-judgment step is provided between the preliminary judgment step and the risk value calculation step.

[0080] Cross-judgment: Determine whether there is a cross between the largest hollow area and the crack in adjacent areas. If so, execute the cross-intervention judgment step; otherwise, execute the risk value calculation step.

[0081] Cross-intervention judgment: Determine the cross area Is it greater than the preset upper limit of the intersection area? If yes, then execute the alarm procedure; otherwise, execute the multi-point cross-judgment procedure.

[0082] Second risk update: Intervene in the risk value calculation process and update the risk value calculation model as follows:

[0083] Multi-point cross-judgment: Determine if there are multiple largest hollow areas and cracks that cross each other. If so, execute the alarm step; otherwise, execute the second risk update step.

[0084] Specifically, when multiple radiation areas intersect, it indicates an increase in the area of ​​voids in the finish layer. By adjusting the risk value calculation model upwards, errors in accident detection can be reduced, facilitating timely discovery. A preset upper limit for the intersection area is also included. This was determined based on historical accident information and historical detachment data.

[0085] In other implementations, the cross-judgment can be set after the first risk update step, and the calculation model for updating the risk value is as follows when performing the second risk update step:

[0086]

[0087] In other embodiments, an environmental assessment step is provided between the preliminary assessment step and the risk value calculation step;

[0088] Environmental assessment: Determine whether the environment is volatile. If so, execute the first weighting step; otherwise, execute the risk value calculation step.

[0089] First weighting: intervene in the risk value calculation step, update the risk value calculation model as follows:

[0090]

[0091] In the formula, D is an adjustment parameter, D > 1.

[0092] Specifically, when the environment changes a lot, the wind and temperature can accelerate the peeling of the finish layer. According to historical data, the influence of the environment on the peeling of the finish layer is determined to determine the value of D, which is approximately determined to be between 1.3-1.5. The value of D can be determined according to the thickness of the finish layer and the adhesion capacity of the finish layer wall. In the embodiment, the value of D is preferably 1.4. By considering the influence of the environmental factors, the calculation of the risk value is more accurate, and the risk can be identified in time, and the management and control can be performed in time.

[0093] In other embodiments, the damage after the combined action of wind, temperature and dead weight can be considered to calculate the pull-shear bidirectional stress of the bonding and leveling layer (considering the calculation under different boundary conditions such as general wall surface, window edge and external corner), and then according to the above calculation, the out-of-plane normal tension of the protective anti-cracking layer under the combined action of wind, temperature and dead weight is calculated (considering the calculation under different boundary conditions such as general wall surface, window edge and external corner). According to the results of the various calculations, the value of D is adjusted, and as the stress increases, the value of D is increased.

[0094] In other embodiments, the environmental judgment can be set after the second risk updating step, and the risk value calculation model is modified by multiple factors.

[0095] In other embodiments, a height judgment step is further provided between the preliminary judgment step and the risk value calculation step.

[0096] Height judgment: judge the area of the hollowing and cracking whether the hollowing and cracking area is greater than the set hollowing area critical value whether the height of the hollowing and cracking is greater than the preset height limit value If yes, the second weighting step is executed, otherwise, the risk value calculation step is executed.

[0097] Second weighting: intervene in the risk value calculation step, update the risk value calculation model as follows:

[0098]

[0099] Specifically, as the floor height increases, the environment changes more severely. By considering the influence of the height, the calculation of the risk value is increased, which is convenient for discovering the risk hidden danger in time and performing management and control in time. The height limit value The height is determined according to the region and the increasing height of the start of the detachment.

[0100] In other embodiments, the height determining step can be arranged between the environment determining step and the risk value calculating step.

[0101] The implementation principle of the detection method for the risk assessment of the outer wall facing layer detachment according to an embodiment of the application is as follows: according to historical information data of the outer facing acceptance and the historical data, a three-dimensional coordinate model and a database are established, then image acquisition, coordinate acquisition, the area of the hollowing and cracking are obtained, the radiation area of the hollowing and cracking is determined, the number of the hollowing and cracking in the radiation area is obtained, the distance between the hollowing and cracking is obtained, the minimum distance is obtained, the intersection area and the intersection number of the radiation areas are obtained, the environment is obtained, and the height is obtained, the risk value calculation model is updated, a calculation method with better calculation accuracy is formed by considering the intervention of multiple interference factors and detachment inducements, then the risk value is obtained by calculation, and then the risk value is compared and judged, so that the possibility of the risk conversion into a falling accident can be found in time, the control is performed in time, and the occurrence of the accident is reduced.

[0102] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A method for detecting the risk of exfoliation of an external wall finish layer, characterized in that: The method comprises the following steps: Modeling: establishing a three-dimensional coordinate model of the house according to the original coordinates of the house building; Preliminary acquisition: acquiring an initial image of the outer wall facing layer of the house, acquiring a plurality of collected coordinate points, and acquiring an existing image of the outer wall facing layer of the house; Again get: analysis of exterior wall finish layer of hollowing and cracking position, calculate the coordinates of the hollowing and cracking outside, get the area of hollowing and cracking Preliminary judgment: judge the area of hollowing and cracking whether it is greater than the set hollowing area threshold If yes, execute the hollowing number obtaining step; Hole count acquisition: acquisition of the number of holes greater than a set hole area threshold the number of holes within a hole radius R range Again judge: judge the number of hollowing and cracking If yes, execute the risk value calculation step. Risk value calculation: when the area of hollowing and cracking is greater than the set hollowing area threshold the total area of all hollowing and cracking within the hollowing and cracking radius range is obtained The hollowing and cracking risk value calculation model is as follows:​ wherein, J > 1 for the empty and cracked radiated area, F0 is the basic risk value, Risk judgment: judging the risk value whether greater than a preset first risk threshold if yes, executing an alarm step, otherwise, executing a treatment suggestion step Warning: notifying relevant personnel, publishing the risk degree, and sending the risk point coordinates; Treatment suggestion: setting a period to monitor the development of the facing layer hollowing and cracking, or suggesting timely repair.

2. The method of claim 1, wherein: Between the preliminary judgment step and the risk value calculation step, a distance monitoring step is further arranged, Distance monitoring: obtaining the area of hollowing and cracking Hollowing and cracking greater than a set critical value of hollowing area Distance between the hollowing and cracking and the hollowing and cracking within the S radius range Judging the distance Whether the distance is less than a distance critical value If yes, performing the distance statistics step, otherwise, performing the risk value calculation step Distance statistics: Get distance Less than the distance threshold The number of hollows and cracks And execute the first risk update step; First risk update: intervening in the risk value calculation step, and the updated risk value calculation model is as follows: In the formula, the calculation model of z is as follows: In the formula, is the distance is the allowable number of hollows and cracks with a distance less than the critical value .

3. The method of claim 1 or 2, wherein: the method is a method of detecting the risk of exfoliation of an exterior wall finish layer. Between the preliminary judgment step and the risk value calculation step, a cross judgment step is further arranged, Cross judgment: acquiring whether the maximum hollowing and cracking of adjacent areas exist cross, if yes, executing the warning step, otherwise, executing the risk value calculation step.

4. The method of claim 3, wherein: Between the cross judgment step and the warning step, a cross intervention judgment step is further arranged; Cross intervention judgment: judging whether the cross area is greater than a preset upper limit value of the cross area If yes, execute the alarm step, otherwise, execute the second risk update step If yes, execute the alarm step, otherwise, execute the second risk update step Second risk update: intervening in the risk value calculation step, and the updated risk value calculation model is as follows:

5. The method of claim 4, wherein: Between the cross intervention judgment step and the second risk update step, a multi-point cross judgment step is further arranged; Multi-point cross judgment: judging whether a plurality of maximum hollowing and cracking of areas exist cross, if yes, executing the warning step, otherwise, executing the second risk update step.

6. The method of claim 1 or 2, wherein: Between the preliminary judgment step and the risk value calculation step, an environment judgment step is further arranged; Environment judgment: judging whether the environment is changeable, if yes, executing the first weighting step, otherwise, executing the risk value calculation step; First weighting: intervening in the risk value calculation step, and the updated risk value calculation model is as follows: In the formula, D is an adjustment parameter, and D>1.

7. The method of claim 1 or 2, wherein: the method is a method of detecting a risk of exfoliation of an exterior wall finish layer. Between the preliminary judgment step and the risk value calculation step, a height judgment step is further arranged; height determination: determining the height of the hollowing and cracking greater than a set hollowing area threshold the height of the hollowing and cracking greater than a preset height limit value if yes, then performing a second weighting step, otherwise, performing a risk value calculation step; Second weighting: intervening in the risk value calculation step, and the updated risk value calculation model is as follows:

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