Measuring Method for the Flatness of the Surface of an Arc-shaped Wall

Abstract

This application relates to the technical field of base station antenna design and manufacturing, and provides a method for measuring the flatness of the inner surface of a circular arc wall. The method for measuring the flatness of the circular arc wall surface includes preparing the circular arc wall to be measured; taking the center of the circular arc wall as the center of a circle, and using the distance from the center of the circle to the inner surface of the circular arc wall as the first radius R1 to form a first circle; equally dividing the first circle into a plurality of first sectors with a central angle of θ; calculating ltheoretical according to any one of the first sectors, and measuring lactual in combination with an auxiliary tool according to any one of the first sectors. Both ltheoretical and lactual are the distances between a first midpoint and a second midpoint. The first midpoint is the midpoint of the arc, and the second midpoint is the midpoint of the line connecting the two endpoints of the arc; calculating a first error value based on ltheoretical and lactual, and judging the flatness of the inner wall surface of the circular arc wall accordingly. By using the equal division method, the circular arc wall is equally divided into a plurality of sectors with the same central angle, comparing ltheoretical and lactual, and judging the flatness error of the inner surface of the wall.

Description

Technical Field

[0001] This application relates to the technical field of wall flatness measurement, and particularly to a method for measuring the flatness of the surface of a circular arc wall. Background Art

[0002] Most of the walls of existing buildings are horizontally and vertically rectangular cuboids, and the surface flatness measurement mainly uses a straightedge and a wedge-shaped feeler gauge. The straightedge is easy to be close to the wall, which is convenient for measurement.

[0003] However, for a circular arc wall, the straightedge cannot completely be close to the inner and outer surfaces of the wall. Measuring the flatness with a wedge-shaped feeler gauge can only obtain a range value, which will cause problems such as inability to measure or large measurement errors, resulting in the inability to effectively evaluate the masonry quality of the circular arc wall. Summary of the Invention

[0004] The main purpose of this application is to provide a method for measuring the flatness of the surface of a circular arc wall, which can evaluate the flatness of the circular arc cavity.

[0005] According to the first aspect of this application, a method for measuring the flatness of the surface of a circular arc wall is provided, including the following steps:

[0006] Prepare the circular arc wall to be measured;

[0007] Taking the center of the circular arc wall as the center and the distance from the center to the inner surface of the circular arc wall as the first radius R1, form a first circle;

[0008] Divide the first circle into a plurality of first sectors with a central angle of θ;

[0009] Calculate ltheoretical according to any one of the first sectors, and measure lactual in combination with an auxiliary tool according to any one of the first sectors, where both ltheoretical and lactual are the distances between a first midpoint and a second midpoint. The first midpoint is the midpoint of the arc, and the second midpoint is the midpoint of the connection line of the two endpoints of the arc;

[0010] Calculate the first error value according to ltheoretical and lactual, and judge the flatness of the inner wall surface of the circular arc wall according to the first error value.

[0011] In an embodiment of this application, the calculating ltheoretical according to any one of the first sectors includes:

[0012]

[0013] In an embodiment of this application, the auxiliary tool includes a plate body and a measuring tool. The surface of the plate body is flat, and the size of the plate body is the same as the chord length of the first sector.

[0014] In one embodiment of the present application, measuring l actual according to any one of the first sectors in combination with an auxiliary tool includes:

[0015] Attach both ends in the length direction of the plate body to any position on the inner surface of the arc-shaped wall;

[0016] Measure the straight-line distance l between the first midpoint and the second midpoint with a measuring tool 实际 .

[0017] In one embodiment of the present application, judging the flatness of the inner wall surface of the arc-shaped wall according to the first error value includes:

[0018] Obtain the first error range of the flatness;

[0019] Compare the first error value with the first error range to judge whether the first error value is within the first error range;

[0020] If so, judge that the flatness of the inner wall surface of the arc-shaped wall is good.

[0021] In one embodiment of the present application, after the step of preparing the arc-shaped wall to be measured, it further includes:

[0022] With the center of the arc-shaped wall as the center and the distance from the center to the outer surface of the arc-shaped wall as the second radius R2, form a second circle;

[0023] Divide the second circle into a plurality of second sectors with a central angle of θ;

[0024] Calculate L theory according to any one of the second sectors, and measure L actual in combination with an auxiliary tool according to any one of the second sectors. Among them, both L theory and L actual are the distances between the end point and the intersection point. The end point is any end point of the arc, and the intersection point is the intersection point of the extension line of the side where any end point of the arc is located and the tangent line of the midpoint of the arc;

[0025] Obtain the second error value according to L theory and L actual, and judge the flatness of the outer wall surface of the arc-shaped wall according to the second error value.

[0026] In one embodiment of the present application, calculating L theory according to any one of the second sectors includes:

[0027]

[0028] In one embodiment of the present application, the auxiliary tool includes a plate body and a measuring tool. The surface of the plate body is flat, and the size of the plate body is the same as the chord length of the second sector.

[0029] In one embodiment of the present application, the measuring method of L actual includes:

[0030] The midpoint in the length direction of the plate body adheres to any position on the outer surface of the arc-shaped wall;

[0031] Measure the linear distance L between the endpoint and the intersection point with a measuring tool 实际 .

[0032] In an embodiment of the present application, the judging the flatness of the inner wall surface of the arc-shaped wall according to the second error value includes:

[0033] Obtain the second error range of the flatness;

[0034] Compare the second error value with the second error range to judge whether the second error value is within the second error range;

[0035] If so, judge that the flatness of the inner wall surface of the arc-shaped wall is good.

[0036] According to the method for measuring the flatness of the surface of an arc-shaped wall provided by the embodiment of the present application, the arc-shaped wall with a certain wall thickness is restored to a circle with an inner ring radius of R1, and the first circle is equally divided into a plurality of first sectors with a central angle of θ. Take one of the first sectors for calculation to obtain l 理论 (that is, the theoretical measurement value when the inner and outer surfaces of the arc-shaped wall are flat) and l 实测 (that is, the actual value for measuring the flatness of the inner and outer surfaces of the arc-shaped wall) are compared, and the flatness error of the wall surface can be evaluated according to the difference between the two. The method for measuring the flatness of the surface of an arc-shaped wall provided by the embodiment of the present application has accurate measurement, avoids inaccurate measurement results caused by the inability of the measuring instrument to fit the wall, and thus can effectively evaluate the masonry quality of the arc-shaped wall. Description of the Drawings

[0037] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present invention and used together with the specification to explain the principles of the present invention.

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 Shows the flowchart of the method for measuring the flatness of the inner wall surface of the arc-shaped wall in Embodiment 1 of the present application;

[0040] Figure 2 Shows the arc-shaped wall in Embodiment 1 of the present application restored to a first circle and equally divided into a plurality of first sectors with a central angle of θ;

[0041] Figure 3 Shows the structural schematic diagram of one of the first sectors in the first embodiment of the present application;

[0042] Figure 4 Shows the flowchart of the method for measuring the flatness of the outer surface of the arc-shaped wall in the second embodiment of the present application;

[0043] Figure 5 Shows that the arc-shaped wall in the second embodiment of the present application is restored to a second circle and equally divided into a plurality of second sectors with a central angle of θ;

[0044] Figure 6 Shows the structural schematic diagram of one of the second sectors in the second embodiment of the present application.

[0045] The description of the reference numerals is as follows:

[0046] 1. Arc-shaped wall; 11. Inner surface; 12. Outer surface; 2. First circle; 21. First sector; 3. Second circle; 31. Second sector. Detailed implementation manners

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0048] Most of the walls of existing buildings are cuboid-shaped with horizontal and vertical sides. The flatness of their surfaces is mainly measured using a straightedge and a wedge-shaped feeler gauge. The straightedge is easy to be close to the wall, which is convenient for measurement. However, for an arc-shaped wall, the straightedge cannot completely be close to the inner and outer surfaces of the wall. Measuring the flatness with a wedge-shaped feeler gauge can only obtain a range value, which will cause problems such as inability to measure or large measurement errors, resulting in the inability to effectively evaluate the masonry quality of the arc-shaped wall.

[0049] In view of this, the present application provides a method for measuring the flatness of the inner surface of an arc-shaped wall and a method for measuring the flatness of the outer surface of an arc-shaped wall to solve the above technical problems.

[0050] The following will describe in detail a method for measuring the flatness of the inner surface of an arc-shaped wall and a method for measuring the flatness of the outer surface of an arc-shaped wall with reference to the accompanying drawings.

[0051] Embodiment 1 of the method for measuring the flatness of the inner surface of an arc-shaped wall

[0052] Figure 1The flowchart of the method for measuring the flatness of the inner surface of the arc-shaped wall in the first embodiment of the present application is shown. Figure 2 The arc-shaped wall in the first embodiment of the present application is restored to a first circle and equally divided into a plurality of first sectors with a central angle of θ. Figure 3 The structural schematic diagram of one of the first sectors in the first embodiment of the present application is shown.

[0053] Please refer to Figures 1-3 As shown, the present application embodiment provides a method for measuring the flatness of the inner surface of an arc-shaped wall, including the following steps:

[0054] S001. Prepare the arc-shaped wall 1 to be measured;

[0055] S002. With the center of the arc-shaped wall 1 as the center and the distance from the center to the inner surface 11 of the arc-shaped wall 1 as the first radius R1, form a first circle 2;

[0056] S003. Divide the first circle 2 into a plurality of first sectors 21 with a central angle of θ;

[0057] S004. Calculate ltheoretical according to any one of the first sectors 21, and measure lactual according to any one of the first sectors 21 in combination with an auxiliary tool, where both ltheoretical and lactual are the distances between the first midpoint and the second midpoint, the first midpoint is the midpoint of the arc, and the second midpoint is the midpoint of the connection line of the two endpoints of the arc;

[0058] S005. Calculate the first error value according to ltheoretical and lactual, and judge the flatness of the inner wall surface of the arc-shaped wall 1 according to the first error value.

[0059] According to the method for measuring the flatness of the surface of the arc-shaped wall 1 provided by the embodiment of the present application, the arc-shaped wall 1 with a certain wall thickness is restored to a first circle 2 with an inner ring radius of R1, and the first circle 2 is equally divided into a plurality of first sectors 21 with a central angle of θ. One of the first sectors 21 is taken for calculation, and the difference between ltheoretical (i.e., the theoretical measurement value when the inner and outer surfaces 12 of the arc-shaped wall 1 are flat) and lactual (i.e., the actual value of measuring the flatness of the inner and outer surfaces 12 of the arc-shaped wall 1) is obtained for comparison. According to the difference between the two, the flatness error of the wall surface can be evaluated. The method for measuring the flatness of the surface of the arc-shaped wall 1 provided by the embodiment of the present application has accurate measurement, avoids inaccurate measurement results caused by the inability of the measuring instrument to fit the wall, and thus can effectively evaluate the masonry quality of the arc-shaped wall 1.

[0060] In the step S004, as Figure 3 shown, the specific calculation of ltheoretical according to any one of the first sectors 21 includes:

[0061] Known:

[0062] ∠AOB = θ; l OA = l OB = l OD = R 1 ;

[0063] Find out:

[0064]

[0065] Finally, obtain:

[0066]

[0067] In an embodiment of the present application, the auxiliary tool includes a plate body and a measuring tool. The surface of the plate body is flat, and the size of the plate body is the same as the chord length of the first sector 21. Among them, the plate body can be a wooden formwork with a flat surface, an iron formwork with a flat surface, etc.; the measuring tool can be a straight ruler or a wedge-shaped feeler gauge, etc. To effectively improve the measurement accuracy, it is necessary to improve the width of the wedge-shaped feeler gauge: reduce the width of the scale plate surface (short side) of the wedge-shaped feeler gauge, specifically, it can be reduced to 0.1 cm - 0.3 cm, so as to reduce the gap between the wedge-shaped feeler gauge and the circular arc-shaped wall 1, thereby better fitting the arc-shaped wall surface and reducing the measurement error.

[0068] In the step S004, the measuring l actual according to any one of the first sectors 21 in combination with the auxiliary tool includes: attaching both ends of the length direction of the plate body to any position on the inner surface 11 of the circular arc-shaped wall 1; measuring the straight-line distance l measured between the first midpoint and the second midpoint through the measuring tool.

[0069] As Figure 6 shown, specifically, both ends of the plate body are attached to any position on the inner surface 11 of the circular arc-shaped wall 1. The midpoint C of the plate body is the second midpoint, and the midpoint D of the arc corresponding to the plate body is the first midpoint. Use a straight ruler or a wedge-shaped feeler gauge to measure the straight-line distance l CD , which is l 实测 .

[0070] In the step S005, the judging the flatness of the inner wall surface of the circular arc-shaped wall 1 according to the first error value includes:

[0071] Obtaining the first error range of the flatness;

[0072] Comparing the first error value with the first error range to judge whether the first error value is within the first error range;

[0073] If so, it is judged that the flatness of the inner wall surface of the circular arc-shaped wall 1 is good.

[0074] If not, it is judged that the flatness of the inner wall surface of the circular arc-shaped wall 1 is unqualified.

[0075] Thus, according to the first error value and the first error range, it is determined whether the first error value is within the first error range. If so, the flatness of the inner wall surface of the arc-shaped wall 1 is good, meeting the masonry quality requirements of the arc-shaped wall 1. If not, the flatness of the inner wall surface of the arc-shaped wall 1 is unqualified and does not meet the masonry quality requirements of the arc-shaped wall 1. Therefore, the flatness of the inner surface 11 of the arc-shaped wall 1 can be effectively determined.

[0076] Embodiment 2 of the method for measuring the flatness of the outer surface of an arc-shaped wall

[0077] Figure 4 The flowchart of the method for measuring the flatness of the outer surface of the arc-shaped wall according to Embodiment 2 of the present application is shown. Figure 5 It shows that the arc-shaped wall in Embodiment 2 of the present application is restored to a second circle and equally divided into a plurality of second sectors with a central angle of θ. Figure 6 The structural schematic diagram of one of the second sectors in Embodiment 2 of the present application is shown.

[0078] Please refer to Figures 4-6 As shown, Embodiment 2 of the present application provides a method for measuring the flatness of the outer surface 12 of an arc-shaped wall 1, including the following steps:

[0079] S001. Prepare the arc-shaped wall 1 to be measured;

[0080] S002. With the center of the arc-shaped wall 1 as the center and the distance from the center to the outer surface 12 of the arc-shaped wall 1 as the second radius R2, form a second circle 3;

[0081] S003. Divide the second circle 3 into a plurality of second sectors with a central angle of θ;

[0082] S004. Calculate L theory according to any one of the second sectors, and measure L actual in combination with auxiliary tools according to any one of the second sectors. Among them, both L theory and L actual are the distances between the end point and the intersection point. The end point is any end point of the arc, and the intersection point is the intersection point of the extension line of the side where any end point of the arc is located and the tangent line of the midpoint of the arc;

[0083] S005. Calculate the second error value according to L theory and L actual, and judge the flatness of the outer wall surface of the arc-shaped wall 1 according to the second error value.

[0084] According to the method for measuring the flatness of the surface of the arc-shaped wall 1 provided by the embodiment of the present application, the arc-shaped wall 1 with a certain wall thickness is restored to a second circle 3 with an inner ring radius of R2. The first circle 2 and the second circle 3 are concentric circles, and the second circle 3 is equally divided into a plurality of second sectors with a central angle of θ. Take one of the second sectors for calculation to obtain L 理论(i.e., the theoretical measurement value when the inner surface 11 and the outer surface 12 of the arc-shaped wall 1 are flat) and L 实测 (i.e., the actual value for measuring the flatness of the inner and outer surfaces 12 of the arc-shaped wall 1) are compared, and the flatness error of the wall surface can be evaluated according to the difference between the two. The method for measuring the flatness of the surface of the arc-shaped wall 1 provided in the embodiment of the present application has accurate measurement, avoiding inaccurate measurement results caused by the inability of the measuring instrument to fit the wall, thereby effectively evaluating the masonry quality of the arc-shaped wall 1.

[0085] In the step S004, as Figure 3 shown, the specific calculation of L theory according to any one of the second sectors includes:

[0086] Known values:

[0087] ∠AOB = θ, L CD = H, L OC = L OE = L OF = R 2 , where H is the thickness of the arc-shaped wall 1;

[0088] Find out:

[0089]

[0090] Finally, it is obtained that:

[0091]

[0092] In an embodiment of the present application, the auxiliary tool includes a plate body and a measuring tool. The surface of the plate body is flat, and the size of the plate body is the same as the chord length of the second sector. Among them, the plate body can be a wooden formwork with a flat surface, an iron formwork with a flat surface, etc.; the measuring tool can be a straight ruler or a wedge-shaped feeler gauge, etc. To effectively improve the measurement accuracy, it is necessary to improve the width of the wedge-shaped feeler gauge: reduce the width of the scale plate surface (short side) of the wedge-shaped feeler gauge, specifically, it can be reduced to 0.1 cm - 0.3 cm, so as to reduce the gap between the wedge-shaped feeler gauge and the arc-shaped wall 1, thereby better fitting the arc-shaped wall surface and reducing the measurement error.

[0093] In the step S004, the measurement method of L actual includes: the midpoint in the length direction of the plate body is attached to any position of the outer surface 12 of the arc-shaped wall 1; the straight-line distance L 实际 is measured by the measuring tool.

[0094] As Figure 6As shown, specifically, the midpoint of the plate body adheres to any position on the outer surface of the arc-shaped wall. The two end points of the plate body are point A and point B. Use a straightedge or a wedge-shaped feeler gauge to measure the distance L between point A and the intersection point E. 实测AE Alternatively, use a straightedge or a wedge-shaped feeler gauge to measure the straight-line distance L between point B and the intersection point F. 实测BF , L 实测AE or L 实测BF is the actual L.

[0095] In step S005, the judging of the flatness of the inner wall surface of the arc-shaped wall 1 according to the second error value includes:

[0096] Obtain the second error range of the flatness.

[0097] Compare the second error value with the second error range to judge whether the second error value is within the second error range.

[0098] If so, it is judged that the flatness of the outer wall surface of the arc-shaped wall 1 is good.

[0099] If not, it is judged that the flatness of the outer wall surface of the arc-shaped wall 1 is unqualified.

[0100] Thus, according to the second error value and the second error range, judge whether the second error value is outside the second error range. If so, the flatness of the outer wall surface of the arc-shaped wall 1 is good and meets the masonry quality requirements of the arc-shaped wall 1. If not, the flatness of the outer wall surface of the arc-shaped wall 1 is unqualified and does not meet the masonry quality requirements of the arc-shaped wall 1, so as to effectively judge the flatness of the outer surface 12 of the arc-shaped wall 1.

[0101] It should be noted that 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0102] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for measuring the flatness of the surface of an arc-shaped wall, characterized in that, it includes the following steps: Prepare the arc-shaped wall to be measured; Taking the center of the arc-shaped wall as the center and the distance from the center to the inner surface of the arc-shaped wall as the first radius R1, form a first circle; Divide the first circle into a plurality of first sectors with a central angle of θ; Calculate l according to any one of the first sectors 理论 , and measure l according to any one of the first sectors in combination with the first auxiliary tool 实际 , where l 理论 and l 实际 are both the distances between the first midpoint and the second midpoint. The first midpoint is the midpoint of the arc, and the second midpoint is the midpoint of the line connecting the two endpoints of the arc; According to l 理论 and l 实际 Calculate the first error value, and judge the flatness of the inner wall surface of the arc-shaped wall according to the first error value; Wherein, after the step of preparing the arc-shaped wall to be measured, it further includes: Taking the center of the arc-shaped wall as the center and the distance from the center to the outer surface of the arc-shaped wall as the second radius R2, form a second circle; Divide the second circle into a plurality of second sectors with a central angle of θ; Calculate L based on any second sector 理论 , measure L according to any second sector combined with the second auxiliary tool 实际 , where L 理论 and L 实际 The endpoints are the distances between the endpoints and the intersection point. The endpoints are any endpoints of the arc, and the intersection point is the intersection point where the extension line of the side where any endpoint of the arc is located intersects with the tangent line of the midpoint of the arc. According to L 理论 and L 实际 Calculate the second error value, and determine the flatness of the outer wall surface of the arc-shaped wall according to the second error value.

2. The method for measuring the flatness of the surface of an arc-shaped wall according to claim 1, characterized in that, Calculating l according to any one of the first sectors 理论 , including:

3. The method for measuring the flatness of the surface of an arc-shaped wall according to claim 1, characterized in that, The first auxiliary tool includes a plate body and a measuring tool, the surface of the plate body is flat, and the size of the plate body is the same as the chord length of the first sector.

4. The method for measuring the flatness of the surface of an arc-shaped wall according to claim 3, characterized in that, Measure l according to any one of the first sector combination auxiliary tools 实际 , including: Attach the two ends in the length direction of the plate body to any position on the inner surface of the arc-shaped wall; Measure the straight-line distance l between the first midpoint and the second midpoint with a measuring tool 实际 .

5. The method for measuring the flatness of the surface of an arc-shaped wall according to claim 1, characterized in that, Judging the flatness of the inner wall surface of the arc-shaped wall according to the first error value includes: Obtain the first error range of the flatness; Compare the first error value with the first error range to judge whether the first error value is within the first error range; If so, judge that the flatness of the inner wall surface of the arc-shaped wall is good.

6. The method for measuring the flatness of the surface of an arc-shaped wall according to claim 1, characterized in that, Calculating L according to any one of the second sectors 理论 , including:

7. The method for measuring the flatness of the surface of an arc-shaped wall according to claim 1, characterized in that, Judging the flatness of the outer wall surface of the arc-shaped wall according to the second error value includes: Obtain the second error range of the flatness; Compare the second error value with the second error range to judge whether the second error value is within the second error range; If so, judge that the flatness of the outer wall surface of the arc-shaped wall is good.

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