A method and device for detecting ground contour

Abstract

The present invention relates to the field of ground detection technology, and in particular to a ground profile detection method and device. The method includes determining a detection area to divide the detection area into a plurality of rectangular test areas, and performing flatness detection in the rectangular test areas; laying out a test line j in the rectangular test area; setting sampling points at a predetermined interval on the test line j, and the profiler passes through the sampling points on the test line j one by one and measures the inclination angle at the sampling points; and calculating the flatness of the test line j, wherein the flatness includes the flatness P of the test line j. j and levelness S j By defining a rectangular test area and a test line, the inclination angle is determined by using a profilometer at multiple sampling points on the test line, thereby facilitating a convenient and accurate detection of the flatness and levelness of a single or multiple test lines.

Description

Technical Field

[0001] The present invention relates to the field of ground detection technology, and in particular to a ground contour detection method and equipment. Background Art

[0002] At present, after the construction of flooring is completed or in the process of application, it is necessary to detect the flatness of the flooring, where the flatness includes the horizontality and flatness of the flooring. For example, the flooring can be detected according to the current provisions of ASTME1155M. However, in the process of application, for the flooring, it does not combine the current actual situation to accurately plan the detection area and sampling area on the floor, resulting in a certain degree of accuracy when the flooring is detected by ASTME1155M.

[0003] Furthermore, in order to accurately detect the flatness of the current floor project and to improve the evaluation and analysis of the levelness and flatness of the floor project, this scheme proposes a ground contour detection method and equipment. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a method and device for detecting ground contours, which can effectively solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a method and device for detecting a ground contour, comprising the following steps:

[0007] S1. Determine a detection area to divide the detection area into a plurality of rectangular test areas, and perform flatness detection in the rectangular test areas;

[0008] S2, laying out test line j in the rectangular test area;

[0009] S3, setting sampling points at a predetermined interval on the test line j, and the profilometer passes through the sampling points on the test line j one by one and measures the inclination angle at the sampling points;

[0010] S4. Calculate the flatness of the test line j, where the flatness includes the flatness P of the test line j. j and levelness S j .

[0011] Furthermore, the method of dividing the rectangular test area is:

[0012] The rectangular test areas are independent of each other;

[0013] When testing concrete floors with construction joints, the boundaries of the rectangular test area do not pass through the construction joints;

[0014] The minimum side length of each rectangular test area should not be less than 2.4m, and the minimum area of ​​each rectangular test area should not be less than 30m 2 .

[0015] Furthermore, the method for laying out the test line j is:

[0016] The test lines j are evenly arranged in the rectangular test area, and the length of any test line j is not less than 3.3m;

[0017] If the ratio of the exclusion area to the test area is not greater than 25%, no part of any test line j should fall within 0.6 m of any floor boundary, construction joint, or isolation joint;

[0018] When parallel test lines j are used, the distance between any two parallel test lines j shall not be less than 1.2m, and the sum of the number and length of test lines j in the parallel and vertical directions shall be the same;

[0019] When non-parallel test lines j are used, all test lines j are at 45° to the longest side of the rectangular test area.

[0020] Furthermore, the predetermined spacing is set to 30±1 mm, so that the profiler can obtain the inclination angle values ​​of all sampling points on the test line through the test line j, which are recorded as θ 11 ,θ 12 ,θ 13 , θ i .

[0021] Furthermore, the flatness P of the test line j j The calculation method is:

[0022] The height value h of point i is pre-set i Calculation:

[0023] When i≤10, the height value h of point i i :

[0024] h i = l·tanθ i

[0025] When i ≥ 11, the height value h of point i i :

[0026] h i = l·tanθ i +h i-10

[0027] In the formula, h iis the height of point i, in mm, l is the distance between the front wheel and the rear wheel, which is 300 mm, θ i The tilt angle value determined when the front wheel of the profilometer travels to point i, i is a natural number, 1, 2, 3...i-1, i;

[0028] The height difference d between point i and point i-1 i Calculation:

[0029] d i =h i -h i-1 =h i-10 -h i-11 +l·(tanθ i -tanθ i-1 )

[0030] Where, d i is the height difference between point i and point i-1, in mm, i is a natural number greater than 10, and can be 11, 12, 13, 14, etc.;

[0031] The eigenvalue q of point i i Calculation:

[0032] q i =d i -d i-1

[0033] In the formula, i is a natural number greater than 10, and is 11, 12, 13, 14, etc., q i is the eigenvalue of point i;

[0034] Test line j all n j -2 q i Standard Deviation Calculation:

[0035] Formula 1:

[0036]

[0037] Formula 2:

[0038]

[0039] In the formula, For all q on test line j i The standard deviation of , i is a natural number greater than 10, take 11, 12, 13, 14....., q i is the eigenvalue of point i, n j is the number of test points of a single test line j, and is a natural number greater than or equal to 12. All q for a single test line j iThe arithmetic mean of

[0040] Test line j flatness P j Calculation:

[0041]

[0042] Where P j is the flatness of the test line j.

[0043] Furthermore, the levelness S of the test line j j The calculation method is:

[0044] The height difference Z between the adjacent 3000mm point i and i-100 is calculated in advance. i Calculation:

[0045] Z i =h i -h i-100 =h i-10 +l·tanθ i -(h i-110 +l·tanθ i-100 )

[0046] =h i-10 -h i-100 +l·-(tanθ i -l·tanθ i-100 )

[0047] In the formula, i is a natural number greater than 110, and the values ​​are 111, 112, 113, 114, etc., Z i is the height difference between the adjacent 3000mm points i and i-100, l is the distance between the front wheel and the rear wheel, which is 300mm;

[0048] Test line j all Z i Standard Deviation Calculation:

[0049] Formula 1:

[0050]

[0051] Formula 2:

[0052]

[0053] In the formula, All for a single test line j The standard deviation of j is the number of test points of a single test line j, which is equal to the ratio of the length of the test line j to 30 mm. It is an integer and is a natural number greater than or equal to 111. All Z for a single test line J i The arithmetic mean of

[0054] Test line j level S j Calculation:

[0055]

[0056] In the formula, S j is the horizontality of the test line j.

[0057] Furthermore, the calculation method of the flatness state of the two test lines j and k is:

[0058] Formula 1:

[0059]

[0060] Formula 2:

[0061]

[0062] Where P j+k is the combined flatness of test line j and test line k, S j+k is the composite level of test line j and test line k, r j All q for test line j i or Z i The number of k For all q of test line k i or Z i The number of k is the flatness of the test line k, S k is the horizontality of the test line k.

[0063] Furthermore, the calculation method of the flatness state of three or more test lines j is:

[0064] P through two test lines j+k and S j+k Then, calculate the third test line f and P j+k and S j+k The flatness and levelness formed are calculated by analogy, and the composite value P of n test lines and [j+k+....(n-1)] is calculated by analogy. j+k+...n and S j+k+...n .

[0065] Calculation of the flatness of the test surface:

[0066] Formula 1:

[0067]

[0068] Formula 2:

[0069]

[0070] In the formula, P is the flatness of the test surface, S is the levelness of the test surface, and P i is the flatness of the i-th rectangular test area, S i is the horizontality of the i-th rectangular test area, A i is the area of ​​the ith rectangular test area, in square meters;

[0071] Calculation of 90% confidence interval:

[0072] Formula 1:

[0073] CI 90％ =-1.82(log 10 r) 3 +19.4(log 10 r) 2 -71.69(log 10 r) +92.62%

[0074] Formula 2:

[0075]

[0076] Formula 3:

[0077]

[0078] In the formula, r is all q i or Z i The number of CI 90％ is the calculated value of 90% confidence interval, F is the corresponding flatness or levelness, is the lower limit of the 90% confidence interval flatness or horizontality, The upper limit of the 90% confidence interval for flatness or horizontality.

[0079] Testing equipment, using a profilometer to perform flatness testing, specifically:

[0080] The flatness and horizontality deviation of the ground within the first 300mm of the profiler's operation is 0mm. The inclination angle θ between two adjacent points i-1 and i is measured after the profiler has traveled 30mm. i-1 and θ i ;

[0081] Calculate the height difference between point i-1 and point i and the eigenvalues ​​of the three adjacent points. The eigenvalues ​​are used to characterize the concavity and convexity of the road surface at the three points and calculate the flatness of the ground.

[0082] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0083] By defining a rectangular test area and a test line, the tilt angle is determined by using a profilometer at multiple sampling points on the test line, thereby facilitating convenient and accurate detection of the flatness and levelness of a single or multiple test lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0085] Figure 1 is a flow chart of the overall method of the present invention;

[0086] Figure 2 This is one of the schematic diagrams of the test lines in the rectangular test area of ​​the present invention;

[0087] Figure 3 This is the second schematic diagram of the test line in the rectangular test area of ​​the present invention. DETAILED DESCRIPTION

[0088] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0089] The present invention will be further described below in conjunction with the embodiments.

[0090] Example 1 (see Figure 1-3 ): A method for detecting a ground contour comprises the following steps:

[0091] S1. Determine a detection area to divide the detection area into a plurality of rectangular test areas, and perform flatness detection in the rectangular test areas;

[0092] Among them, when determining that the detection area can be selected on the ground and needs to be explained, when dividing the rectangular test area, the rectangular test area must meet the following conditions:

[0093] The rectangular test areas are independent of each other to ensure the accuracy of the test;

[0094] When testing concrete floors with construction joints, the border of the rectangular test area should not pass through the construction joints to facilitate stable testing;

[0095] The minimum side length of each rectangular test area should not be less than 2.4m, and the minimum area of ​​each rectangular test area should not be less than 30m 2 .

[0096] Based on the above conditions, the leveling inspection operation can be performed later.

[0097] S2, laying out a test line j in the rectangular test area, by constructing a test line j adapted to the terrain in the rectangular test area, so that the profilometer can accurately detect the flatness of the rectangular test area with the help of the currently defined test line j;

[0098] When constructing test line j, the following conditions must be met:

[0099] The test lines j should be evenly arranged in the rectangular test area, and the length of any test line j should not be less than 3.3m;

[0100] If the ratio of the exclusion area to the test area is not greater than 25%, no part of any test line j should fall within 0.6 m of any floor boundary, construction joint, or isolation joint;

[0101] When parallel test lines j are used, the distance between any two parallel test lines j should not be less than 1.2m, and the sum of the number and length of test lines j in the parallel and vertical directions should be the same;

[0102] When non-parallel test lines j are used, all test lines j form a 45° angle with the longest side of the rectangular test area;

[0103] That is, more accurate detection can be performed by constructing multiple test lines j.

[0104] It should be noted that the exclusion area refers to the sum of the areas formed by a horizontal line or a vertical line drawn from the end point of the test line j closest to the edge of the rectangular test area and the edge of the rectangular test area.

[0105] In this scheme, refer to Figure 2 and Figure 3 For the method of setting the test line j in the rectangular test area, Figure 2 is the "tic-tac-toe" test line j, Figure 3 It is the 45° test line j.

[0106] It is worth noting that the sum of the number and length of the test lines j in both directions of the “tic-tac-toe” test line is the same;

[0107] All test lines j of the 45° test line are at 45° with the longest side line of the test area;

[0108] If the width of the rectangular test area is not less than 7.5m, Figure 2or Figure 3 The test line j in can be set;

[0109] If the width of the rectangular test area is less than 7.5m, select Figure 3 Test line j in.

[0110] S3, setting sampling points at a predetermined interval on the test line j, and the profilometer passes through the sampling points on the test line j one by one and measures the inclination angle at the sampling points;

[0111] In this scheme, the given spacing can be pre-set to (30±1) mm, so that the profiler can obtain the inclination angle values ​​of all sampling points on the test line through the test line j, which are recorded as θ 11 ,θ 12 ,θ 13 , θ i ;

[0112] In this scheme, the detection principle of the sampling profile method is:

[0113] Assuming that the flatness and levelness deviation of the ground within the first 300mm of the profiler (Dipstick-2286 test equipment) is 0mm (measured by a 300mm ruler), measure the inclination angle θ between two adjacent points (i-1) and point i (sampling point) after the profiler has traveled 30mm. i-1 and θ i ;

[0114] Calculate the height difference between point (i-1) and point i and the eigenvalue q of the three adjacent points. The eigenvalue q is used to characterize the unevenness of the road surface at these three points, thereby calculating the flatness of the ground. The flatness includes the flatness value (p value) and the levelness value (s value).

[0115] S4. Calculate the flatness of the test line j, where the flatness includes the flatness P of the test line j. j and levelness S j , where the flatness P of the test line j is j The calculation method is:

[0116] The height value h of point i is pre-set i Calculation:

[0117] When i≤10, the height value h of point i i :

[0118] h i = l·tanθ i

[0119] When i ≥ 11, the height value h of point i i :

[0120] hi = l·tanθ i +h i-10

[0121] In the formula, h i is the height of point i, in mm, l is the distance between the front wheel and the rear wheel, which is 300 mm, θ i The tilt angle value determined when the front wheel of the profilometer travels to point i, i is a natural number, 1, 2, 3...i-1, i;

[0122] The height difference d between point i and point (i-1) i Calculation:

[0123] d i =h i -h i-1 =h i-10 -h i-11 +l·(tanθ i -tanθ i-1 )

[0124] Where, d i is the height difference between point i and point (i-1), in mm, i is a natural number greater than 10, and can be 11, 12, 13, 14, etc.;

[0125] The eigenvalue q of point i i Calculation:

[0126] q i =d i -d i-1

[0127] In the formula, i is a natural number greater than 10, and is 11, 12, 13, 14, etc., q i is the eigenvalue of point i (dimensionless);

[0128] Test line j all (n j -2) q i Standard Deviation Calculation:

[0129] Formula 1:

[0130]

[0131] Formula 2:

[0132]

[0133] In the formula, For all q on test line j i The standard deviation of , i is a natural number greater than 10, take 11, 12, 13, 14....., qi is the eigenvalue of point i, n j is the number of test points of a single test line j, and is a natural number greater than or equal to 12. All q for a single test line j i The arithmetic mean of

[0134] Test line j flatness P j Calculation:

[0135]

[0136] Where P j is the flatness of the test line j (dimensionless).

[0137] Test line j's horizontality S j Calculation:

[0138] The height difference Z between the adjacent 3000mm point i and (i-100) point is calculated in advance. i Calculation:

[0139] Z i =h i -h i-100 =h i-10 +l·tanθ i -(h i-110 +l·tanθ i-100 )

[0140] =h i-10 -h i-100 +l·-(tanθ i -l·tanθ i-100 )

[0141] In the formula, i is a natural number greater than 110, and the values ​​are 111, 112, 113, 114, etc., Z i is the height difference between the adjacent 3000mm points i and (i-100), l is the distance between the front wheel and the rear wheel, which is 300mm;

[0142] Test line j all Z i Standard Deviation Calculation:

[0143] Formula 1:

[0144]

[0145] Formula 2:

[0146]

[0147] In the formula, All for a single test line j The standard deviation of j is the number of test points of a single test line j, which is equal to the ratio of the length of the test line j to 30 mm. It is an integer and is a natural number greater than or equal to 111. All Z for a single test line J i The arithmetic mean of

[0148] Test line j level S j Calculation:

[0149]

[0150] In the formula, S j is the horizontality of the test line j (dimensionless).

[0151] Therefore, according to the above, the flatness of the test line j is detected to clarify the actual levelness and flatness of the current test line j, so as to make auxiliary decisions for subsequent operations on the current terrain.

[0152] Example 2

[0153] P of two test lines j j Calculation:

[0154] Calculation of the flattening state of the two test lines j and k:

[0155] Formula 1:

[0156]

[0157] Formula 2:

[0158]

[0159] Where P j+k is the combined flatness of test line j and test line k, S j+k is the composite level of test line j and test line k, r j All q for test line j i or Z i The number of k For all q of test line k i or Z i The number of k is the flatness of the test line k, S k is the horizontality of the test line k, and the data here are all obtained dimensionlessly;

[0160] Example 3

[0161] Calculation of the flat state of three or more test lines:

[0162] For three or more test lines, the calculation of the flatness state can be performed by P of two test lines in Example 2. j+k and S j+k Then, calculate the third test line f and P j+k and S j+k The flatness and levelness formed by the above equations can be obtained by the same logic, and the composite value P of n test lines and [j+k+....(n-1)] can be calculated. j+k+...n and S j+k+...n ;

[0163] Calculation of the flatness of the test surface:

[0164] Formula 1:

[0165]

[0166] Formula 2:

[0167]

[0168] In the formula, P is the flatness of the test surface, S is the levelness of the test surface, and P i is the flatness of the i-th rectangular test area, S i is the horizontality of the i-th rectangular test area, A i is the area of ​​the ith rectangular test area, in square meters;

[0169] Calculation of 90% confidence interval:

[0170] Formula 1:

[0171] CI 90％ =-1.82(log 10 r) 3 +19.4(log 10 r) 2 -71.69(log 10 r) +92.62%

[0172] Formula 2:

[0173]

[0174] Formula 3:

[0175]

[0176] In the formula, r is all q i or Z i The number of CI 90％ is the calculated value of 90% confidence interval (dimensionless), F is the corresponding flatness or levelness, is the lower limit of the 90% confidence interval for flatness or horizontality (dimensionless), is the upper limit of the 90% confidence interval for flatness or horizontality (dimensionless);

[0177] Therefore, the flatness P, levelness S and 90% confidence interval calculated values ​​of the test surface are used as the test surface results and inspection results.

[0178] Detection by ruler method (it should be noted that both the ruler method and the leveling method can perform subsequent detection based on the rectangular test area and test line planned by S2 in Example 1 of this solution, and the leveling method will not be described in detail here):

[0179] According to the above step S2, the test line j is arranged in the rectangular test area. Figure 3 The length of the middle test line j is an integer multiple of the length of the ruler;

[0180] Carry out the first measurement along one end of the test line j with a ruler, and use a feeler gauge to read the maximum gap height d1 between the ruler and the ground. Complete the second, third,,, and i-th measurements along the test line j in sequence, and record them as d2, d3,,,, respectively. i ;

[0181] 90% confidence interval calculation:

[0182]

[0183] Where η is the confidence interval value of 90%, N j When the confidence interval is 90%, d i The number of i is d i The number of .

[0184] 100% confidence interval calculation:

[0185] Take all N i d in the grid measurement max .

[0186] Therefore, the current levelness and flatness states can be detected according to the 90% confidence interval and the 100% confidence interval respectively to clarify whether the levelness and flatness meet the standards.

[0187] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting a ground contour, characterized in that: The steps include: S1. Determine a detection area to divide the detection area into a plurality of rectangular test areas, and perform flatness detection in the rectangular test areas; S2, laying out test line j in the rectangular test area; S3, setting sampling points at a predetermined interval on the test line j, and the profilometer passes through the sampling points on the test line j one by one and measures the inclination angle at the sampling points; S4. Calculate the flatness of the test line j, where the flatness includes the flatness P of the test line j. j and levelness S j ; Test line j's flatness P j The calculation method is: The height value h of point i is pre-set i Calculation: When i≤10, the height value h of point i i : h i =l·tanθ i When i ≥ 11, the height value h of point i i : h i =l·tanθ i +h i-10 In the formula, h i is the height of point i, in mm, l is the distance between the front wheel and the rear wheel, which is 300 mm, θ i The tilt angle value determined when the front wheel of the profilometer travels to point i, i is a natural number, 1, 2, 3...i-1, i; The height difference d between point i and point i-1 i Calculation: d i =h i -h i-1 =h i-10 -h i-11 +l·(tanθ i -tanθ i-1 ) Where, d i is the height difference between point i and point i-1, in mm, i is a natural number greater than 10, and can be 11, 12, 13, 14, etc.; The eigenvalue q of point i i Calculation: q i =d i -d i-1 In the formula, i is a natural number greater than 10, and is 11, 12, 13, 14, etc., q i is the eigenvalue of point i; Test line j all n j -2 q i Standard Deviation Sq i Calculation: Formula 1: Formula 2: In the formula, Sq i For all q on test line j i The standard deviation of , i is a natural number greater than 10, take 11, 12, 13, 14....., q i is the eigenvalue of point i, n j is the number of test points of a single test line j, and is a natural number greater than or equal to 12. All q for a single test line j i The arithmetic mean of Test line j flatness P j Calculation: Where P j is the flatness of the test line j; Test line j level S j The calculation method is: The height difference Z between the adjacent 3000mm point i and i-100 point is calculated in advance. i Calculation: Z i =h i -h i-100 =h i-10 +l·tanθ i -(h i-110 +l·tanθ i-100 ) =h i-10 -h i-100 +l·-(tanθ i -l·tanθ i-100 ) In the formula, i is a natural number greater than 110, and the values ​​are 111, 112, 113, 114, etc., Z i is the height difference between the adjacent 3000mm points i and i-100, l is the distance between the front wheel and the rear wheel, which is 300mm; Test line j all Z i Standard Deviation zi Calculation: Formula 1: Formula 2: In the formula, All for a single test line j The standard deviation of j is the number of test points of a single test line j, which is equal to the ratio of the length of the test line j to 30 mm. It is an integer and is a natural number greater than or equal to 111. All Z for a single test line J i The arithmetic mean of Test line j level S j Calculation: In the formula, S j is the horizontality of the test line j.

2. A method for detecting ground contour according to claim 1, characterized in that: The method for dividing the rectangular test area is: The rectangular test areas are independent of each other; When testing concrete floors with construction joints, the boundaries of the rectangular test area do not pass through the construction joints; The minimum side length of each rectangular test area should not be less than 2.4m, and the minimum area of ​​the rectangular test area should not be less than 30m 2 .

3. A method for detecting ground contour according to claim 1, characterized in that: The method for laying out the test line j is: The test lines j are evenly arranged in the rectangular test area, and the length of any test line j is not less than 3.3m; If the ratio of the exclusion area to the test area is not greater than 25%, no part of any test line j should fall within 0.6 m of any floor boundary, construction joint, or isolation joint; When parallel test lines j are used, the distance between any two parallel test lines j shall not be less than 1.2m, and the sum of the number and length of test lines j in the parallel and vertical directions shall be the same; When non-parallel test lines j are used, all test lines j are at 45° to the longest side of the rectangular test area.

4. A method for detecting ground contour according to claim 1, characterized in that: The predetermined spacing is set to 30 ± 1 mm, so that the profiler can obtain the inclination angle values ​​of all sampling points on the test line through the test line j, which are recorded as θ 11 ,θ 12 ,θ 13 , θ i .

5. A method for detecting ground contour according to claim 1, characterized in that: The calculation method for the flatness of the two test lines j and k is: Formula 1: Formula 2: Where P j+k is the combined flatness of test line j and test line k, S j+k is the composite level of test line j and test line k, r j All q for test line j i or Z i The number of k For all q of test line k i or Z i The number of k is the flatness of the test line k, S k is the horizontality of the test line k.

6. A method and device for detecting ground contour according to claim 5, characterized in that: The calculation method for the flatness of three or more test lines is: P through two test lines j+k and S j+k Then, calculate the third test line f and P j+k and S j+k The flatness and levelness formed are calculated by analogy, and the composite value P of n test lines and [j+k+....(n-1)] is calculated by analogy. j+k+...n and S j+k+...n .

7. A method for detecting ground contour according to claim 6, characterized in that: Calculation of the flatness of the test surface: Formula 1: Formula 2: In the formula, P is the flatness of the test surface, S is the levelness of the test surface, and P i is the flatness of the i-th rectangular test area, S i is the horizontality of the i-th rectangular test area, A i is the area of ​​the ith rectangular test area, in square meters; Calculation of 90% confidence interval: Formula 1: CI 90％ =-1.82(log 10 r) 3 +19.4(log 10 r) 2 -71.69(log 10 r)+92.62% Formula 2: Formula 3: In the formula, r is all q i or Z i The number of CI 90％ is the calculated value of 90% confidence interval, F is the corresponding flatness or levelness, is the lower limit of the 90% confidence interval flatness or horizontality, The upper limit of the 90% confidence interval for flatness or horizontality.

8. A detection device, applied to the method for detecting a ground contour according to claim 1, characterized in that: The flatness test is performed by the profilometer, specifically: The flatness and horizontality deviation of the ground within the first 300mm of the profiler's operation is 0mm. The inclination angle θ between two adjacent points i-1 and i is measured after the profiler has traveled 30mm. i-1 and θ i ; Calculate the height difference between point i-1 and point i and the eigenvalues ​​of the three adjacent points. The eigenvalues ​​are used to characterize the concavity and convexity of the road surface at the three points and calculate the flatness of the ground.

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