A device and method for measuring the surface flatness and angle of a concrete test block

Abstract

The present application specifically relates to a device and method for measuring the surface flatness and angle of a concrete test block. The device includes five laser groups: upper, lower, left, right, and front. The upper and lower laser groups include four laser sensors, and the remaining groups include three laser sensors. The laser points of the upper and lower laser groups are rectangular, and the remaining groups are L-shaped. The method in the present application can measure the angle and flatness between each surface by combining the spacing measured by the laser sensor with trigonometric function operations. The present application can efficiently and concisely measure the flatness and angle of the other five surfaces except the rough surface at the same time, effectively improving the credibility of the test block measurement data.

Description

Technical Field

[0001] The present application belongs to the technical field of engineering quality inspection, and specifically relates to a device and method for measuring the surface flatness and angle of a concrete test block. Background Art

[0002] Before the compression test, the flatness of all surfaces of the concrete test block except the rough surface should be measured. The standards for measuring the flatness of the test block are as follows: (1) The flatness tolerance of the pressure-bearing surface should be less than 0.0005d (where d is the side length of the test piece); (2) The actual dimensional tolerance of the side length, diameter and height of the test piece should not be greater than 1mm; (3) The adjacent surfaces of the test piece should be perpendicular, that is, the angle is 90°, and the tolerance should not be greater than 0.5°. The existing technology for automatic detection of the flatness of concrete test blocks has relatively complex steps and equipment. In fact, based on the manufacturing characteristics of concrete test blocks, the flatness of each surface can be efficiently and concisely judged by collecting feature points. Summary of the invention

[0003] In a first aspect, the present invention provides a device for measuring the surface flatness and angle of a concrete test block, which can efficiently and concisely measure the flatness of five surfaces except the rough surface at the same time.

[0004] The technical solution of this application is as follows:

[0005] A device for measuring the surface flatness and angle of a concrete test block, comprising a test stand, the test stand being provided with a test hole for placing the test block, and the test hole being provided with:

[0006] An upper laser group, composed of four laser sensors, is used to emit a light beam vertically to the top surface of the test block and form laser points on the top surface of the test block, and the laser points are connected in sequence to form a rectangle;

[0007] A lower laser group, consisting of four laser sensors, each laser sensor is aligned with a laser sensor in the upper laser group, and the lower laser group is used to emit a light beam vertically to the bottom surface of the test block and form a laser spot on the bottom surface of the test block;

[0008] The left laser group is composed of three laser sensors, and is used to emit a light beam vertically to the left side of the test block and form a laser point on the left side of the test block, and the laser points are connected in sequence to form an L shape;

[0009] The right laser group is composed of three laser sensors, each laser sensor is aligned with a laser sensor in the left laser group, and the right laser group is used to emit a light beam vertically to the right side of the test block and form a laser point on the right side of the test block;

[0010] The front laser group is composed of three laser sensors. The front laser group is used to emit a light beam vertically to the front of the test block and form three laser points in front of the test block corresponding to the laser point height and spacing of the left laser group. The three laser points are connected in sequence to form an L shape.

[0011] Furthermore, the upper laser group and the lower laser group are respectively connected with a moving arm.

[0012] Furthermore, the detection hole is recessed downward from the surface of the detection base, and the detection hole includes a first detection plane at the top and a second detection plane at the bottom, the size of the first detection plane is 15cm×15cm, the size of the second detection plane is 10cm×10cm, the first detection plane and the second detection plane are transitioned by a slope, and the first detection plane and the surface of the detection base are transitioned by a slope.

[0013] Furthermore, the distance from the upper laser group to the detection hole is equal to the sum of the distance from the lower laser group to the detection hole and the edge length of the standard test piece;

[0014] The distance from the left laser group to the vertical extension surface of the left side of the detection hole is equal to the distance from the right laser group to the vertical extension surface of the right side of the detection hole and the distance from the front laser group to the vertical extension surface of the front side of the detection hole.

[0015] In a second aspect, the present application provides a method for measuring the surface flatness and angle of a concrete test block, comprising the following steps:

[0016] Step 1: Adjust the positions of the upper laser group and the lower laser group according to the edge length of the standard test block corresponding to the test block to be measured;

[0017] Step 2: Measure the horizontal distance from the left laser group to the right laser group, and record this distance as the horizontal no-load distance; place the test block to be measured in the detection hole, measure the distance from the left laser group to the left side of the test block and the distance from the right laser group to the right side of the test block, and obtain the three groups of corresponding left distances and right distances;

[0018] as well as,

[0019] Measure the vertical distance between the upper laser group and the lower laser group, record this distance as the vertical no-load distance, measure the distance from the upper laser group to the top surface of the test block and the distance from the lower laser group to the bottom surface of the test block, and obtain the upper side distance and lower side distance of the three groups corresponding to each other;

[0020] Step 3: Use the horizontal no-load distance to subtract the left distance and the right distance to get three sets of horizontal loaded distances; use the vertical no-load distance to subtract the upper distance and the lower distance to get three sets of vertical loaded distances;

[0021] Step 4: Compare the numerical differences of the three groups of horizontal load distances and the numerical differences of the three groups of vertical load distances to see if they are all within the error range, or compare the three groups of left distances and the three groups of right distances to see if they are all within the error range; if so, determine that the specimen is placed in the correct position; if not, calculate the sum of the left distance and the right distance of each group and the sum of the upper distance and the lower distance of each group, and determine whether the differences of the three summation results are all within the allowable range. If so, determine that the specimen is placed in an oblique position; if not, discard the measurement result and check the position of the test block and the laser group;

[0022] Step 5: When the specimen is placed in the upright position, the plane where the four laser sensors in the upper laser group are located is plane I. Plane II is established based on the laser point position of the upper laser group. The datum reference plane is defined as the minimum sum of the squares of the distances of each laser point from the horizontal plane. The datum reference plane is recorded as plane III. The absolute value of the difference between the distances from plane I to plane III and from plane I to plane II is taken as the top surface flatness.

[0023] The plane where the three laser sensors in the left laser group are located is taken as side I, and side II is established based on the laser point positions of the left laser group. The base reference side is defined as the side where the sum of the squares of the distances of the laser points to the side is the smallest. The base reference side is recorded as side III, and the absolute value of the difference between the distances from side I to side III and from side I to side II is taken as the flatness of the left side.

[0024] as well as,

[0025] When the specimen is placed in an oblique state, the horizontal tilt angle is calculated according to the distance measured by the two laser sensors located in the same horizontal plane in the left laser group or the right laser group and the distance between the two laser sensors according to trigonometric functions; the vertical tilt angle is calculated according to the distance measured by a group of front and rear laser sensors in the upper laser group or the lower laser group and the distance between the front and rear laser sensors of the laser group used according to trigonometric functions; the left laser group or the right laser group is projected according to the horizontal tilt angle, and the upper laser group or the lower laser group is projected according to the vertical tilt angle, and plane I, plane II, plane III, side I, side II and side III are defined respectively according to the method when placed upright, and the absolute value of the distance difference between side I and side III and between side I and side II is used as the left side flatness, and the absolute value of the distance difference between plane I and plane III and between plane I and plane II is used as the top surface flatness;

[0026] Step 6: When the test piece is placed upright, the angle between the surfaces is taken as the angle between the laser points of the two horizontal laser sensors in the left laser group or the right laser group and the laser points of the front and rear laser sensors on the same side in the upper laser group or the lower laser group; the angle between the surfaces is taken as the angle between the laser points of the two horizontal laser sensors in the front laser group and the laser points of the left and right laser sensors on the same side in the upper laser group or the lower laser group;

[0027] When the test piece is placed obliquely, the angle between the surfaces is taken as the angle between the line connecting the laser points of the two vertical sensors of the left laser group or the right laser group and the line connecting the laser points of the left and right laser sensors on the same side in the upper laser group and the lower laser group; the angle between the surfaces is taken as the angle between the laser points of the two vertical laser sensors in the front laser group and the line connecting the laser points of the front and rear laser sensors in the upper laser group or the lower laser group.

[0028] Furthermore, the method further comprises step seven: calculating the right side surface flatness according to the calculation method of the left side surface flatness in step five, and calculating the bottom surface flatness according to the calculation method of the top surface flatness in step five.

[0029] Furthermore, when the specimen is placed upright, the horizontal load distance is taken as the horizontal edge length, and the vertical load distance is taken as the vertical edge length;

[0030] When the specimen is placed obliquely, the horizontal edge length and vertical edge length of the specimen are calculated based on the horizontal load distance and the vertical load distance combined with the horizontal tilt angle and the vertical tilt angle.

[0031] Furthermore, the upper laser group and the lower laser group are moved simultaneously, and steps 2 to 5 are repeated to obtain several groups of data, and the measurement result is output according to the weighted average value of each group of data.

[0032] Due to the adoption of the above technical solution, the beneficial effects of this application are as follows:

[0033] 1. In this application, the distance data is measured based on a laser sensor, and the acquired data has higher accuracy, which can improve the credibility of the results.

[0034] 2. This application can efficiently obtain the flatness through a simple algorithm, and simultaneously calculate multiple data such as edge length, angle between faces, etc., and can more comprehensively measure various data of the concrete test block.

[0035] 3. This application facilitates the control of accuracy, and various measurement accuracies can be adjusted through redundant design and error correction to meet different engineering needs.

[0036] 4. This application is implemented based on a laser displacement sensor, which helps to achieve automation and improve measurement efficiency.

[0037] 5. The device in this application can measure two commonly used sizes of test blocks, with one machine for multiple uses, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0039] Figure 1 A schematic diagram of the structure of a device for measuring the surface flatness and angle of a concrete test block provided in this application;

[0040] Figure 2 This is a schematic diagram of the detection hole in this application;

[0041] Figure 3 This is a schematic diagram of the positions of laser points on each surface of the test block in this application;

[0042] In the accompanying drawings,

[0043] 1. Detection platform; 2. Detection hole; 2-1. First detection surface; 2-2. Second detection surface; 3. Upper laser group; 4. Lower laser group; 5. Left laser group; 6. Right laser group; 7. Front laser group; 8. Laser sensor; 9. Moving arm. DETAILED DESCRIPTION

[0044] Based on the background technology, the present application provides a device for measuring the surface flatness and angle of a concrete test block, including a detection platform 1, wherein the detection platform 1 is provided with a detection hole 2 for placing the test block, and the detection hole 2 is surrounded by: an upper laser group 3, composed of four laser sensors 8, wherein the upper laser group 3 is used to vertically emit a light beam to the top surface of the test block and form a laser point on the top surface of the test block, and each laser point is connected in sequence to form a rectangle; a lower laser group 4, composed of four laser sensors 8, each laser sensor 8 is aligned with a laser sensor 8 in the upper laser group 3, and the lower laser group 4 is used to vertically emit a light beam to the bottom surface of the test block and form a laser point on the bottom surface of the test block; a left laser group 5, composed of three The left laser group 5 is composed of three laser sensors 8, and each laser sensor 8 is aligned with a laser sensor 8 in the left laser group 5. The right laser group 6 is used to vertically emit a light beam to the right side of the test block and form a laser spot on the left side of the test block. The laser points are connected in sequence to form an L shape; the right laser group 6 is composed of three laser sensors 8, and each laser sensor 8 is aligned with a laser sensor 8 in the left laser group 5. The right laser group 6 is used to vertically emit a light beam to the right side of the test block and form a laser spot on the right side of the test block; the front laser group 7 is composed of three laser sensors 8. The front laser group 7 is used to vertically emit a light beam to the front of the test block and form three laser spots in front of the test block corresponding to the height and spacing of the laser points of the left laser group 5. The three laser spots are connected in sequence to form an L shape.

[0045] The inspection specification clearly requires that the angle between the faces of the concrete test block needs to be inspected. When the existing technology detects flatness, there is actually no synergy between the faces, and even only one set of sensors can detect the flatness of each face. The laser groups set on the left and right sides are at the same distance from the test block surface only to facilitate the judgment of whether the test piece is placed upright or tilted, but the judgment of upright and tilted can be achieved by the sum of the laser sensor 8 in the laser group and the corresponding laser sensor 8. Setting the distance equal actually complicates the device. Due to differences in composition, the volume of the concrete test block will change during the curing process, which is difficult to predict. Therefore, the position when placed in the detection hole 2 may be larger than the error range. Therefore, it is not comprehensive to calculate whether the test block is tilted only by fixing the position, and it needs to be combined with an optimization algorithm.

[0046] In this application, three L-shaped laser sensors 8 are set on the left, right and front sides, with the purpose of adding vertical sensors to facilitate the measurement of the angle between the two surfaces when the test block is vertically tilted. In this application, vertical tilt does not only refer to the tilt of the position of the test block. It is possible that a slope is generated due to unevenness on one side of the test block during the casting process, which is also considered as vertical tilt. This aspect is taken into consideration in this application.

[0047] In the present application, the laser groups on the left, right and front sides can be positioned at the same position on the test block, or they can be positioned at the same position and realized by the following method. In the present application, the distance range of the laser groups on the left, right and front sides is 55±15mm.

[0048] As a preferred embodiment of the present application, the upper laser group 3 and the lower laser group 4 are respectively connected to a moving arm 9. The moving arm 9 can drive the upper laser group 3 and the lower laser group 4 to move, thereby obtaining multiple sets of data, and then the flatness and plane angle of each position can be measured, which can further enhance the credibility of the data. When the device is automated, the collection efficiency is very high, the data obtained is comprehensive, and the detection is more accurate.

[0049] In a specific embodiment of the above-mentioned implementation, the detection hole 2 is recessed downward from the surface of the detection stand 1, and the detection hole 2 includes a first detection plane at the top and a second detection plane at the bottom, the size of the first detection plane is 15cm×15cm, the size of the second detection plane is 10cm×10cm, the first detection plane and the second detection plane are transitioned by a slope, and the first detection plane and the surface of the detection stand 1 are transitioned by a slope. The two commonly used sizes of concrete test blocks are 15cm cube and 10cm cube. The present application can adapt to different detection conditions and optimize the use scenarios of the device by setting two sizes of detection holes 2.

[0050] In a preferred embodiment of the above embodiment, the distance from the upper laser group 3 to the detection hole 2 is equal to the sum of the distance from the lower laser group 4 to the detection hole 2 and the edge length of the standard test piece; the distance from the left laser group 5 to the vertical extension surface of the left side of the detection hole 2 is equal to the distance from the right laser group 6 to the vertical extension surface of the right side of the detection hole 2 and the distance from the front laser group 7 to the vertical extension surface of the front side of the detection hole 2.

[0051] The present application provides a method for measuring the surface flatness and angle of a concrete test block, comprising the following steps:

[0052] Step 1: Adjust the positions of the upper laser group and the lower laser group according to the edge length of the standard test block corresponding to the test block to be measured.

[0053] In this step, the distance from the upper laser group to the detection hole can be made equal to the sum of the distance from the lower laser group to the detection hole and the edge length of the standard test piece.

[0054] In specific implementation, the distance from the upper laser group to the detection hole can also be greater than or less than the sum of the distance from the lower laser group to the detection hole and the edge length of the standard test piece. In this case, it is necessary to compare the data measured by the upper and lower laser groups respectively to determine whether the test block is tilted in the vertical direction. Figure 3 As shown in the figure, if the a and b data measured by the upper laser group are the same, the d and c data are the same, but a is not equal to c, then it can be determined that the test block is tilted in the vertical direction. This judgment method has nothing to do with the distance from the upper laser group and the lower laser group to the corresponding surface.

[0055] Step 2: Measure the horizontal distance from the left laser group to the right laser group, and record this distance as the horizontal no-load distance; place the test block to be measured in the detection hole, measure the distance from the left laser group to the left side of the test block and the distance from the right laser group to the right side of the test block, and obtain the three groups of corresponding left distances and right distances; as shown in the attached figure Figure 3 As shown, that is the distance between ke, if, hg, the distance on the left is i, k, h, and the distance on the right is e, f, g.

[0056] as well as,

[0057] Measure the vertical distance between the upper laser group and the lower laser group, record this distance as the vertical no-load distance, measure the distance from the upper laser group to the top surface of the test block and the distance from the lower laser group to the bottom surface of the test block, and obtain the upper side distance and lower side distance of the three groups corresponding to each other.

[0058] Step 3: Use the horizontal no-load distance to subtract the left distance and the right distance to obtain three sets of horizontal loaded distances; use the vertical no-load distance to subtract the upper distance and the lower distance to obtain three sets of vertical loaded distances.

[0059] That is, ke-ke, and accordingly three sets of horizontal load distances can be obtained, and the same is true for vertical load distances.

[0060] Step 4: Compare the three groups of horizontal load distance numerical differences and the three groups of vertical load distance numerical differences to see if they are all within the error range, or compare the three groups of left distances and the three groups of right distances to see if they are all within the error range.

[0061] The above two comparison methods are different. The first one is suitable for the case where the laser groups are arranged at equal distances. Check the errors between the three groups of horizontal / vertical load distances and the standard test piece to determine whether they are placed upright or tilted. The second one is to determine whether the three left distances are equal among the three groups of left distances, and then determine whether the right distances are equal. Both methods are acceptable.

[0062] If yes, the specimen is judged to be placed in the correct position. If not, the sum of the left distance and the right distance of each group and the sum of the upper distance and the lower distance of each group are calculated, and the differences of the three groups of sums are judged to be within the allowable range. If yes, the specimen is judged to be placed obliquely. If not, the measurement result is discarded and the position of the test block and the laser group is checked. It should be noted that since the device in the present application is placed on the detection hole, the operator can clearly notice when the tilt is too large. The present application is suitable for errors that are difficult to distinguish by the naked eye in precision tests, so that the measurement is more accurate.

[0063] Step 5: When the specimen is placed in the upright position, the plane where the four laser sensors in the upper laser group are located is plane I. Plane II is established based on the laser point position of the upper laser group. The datum reference plane is defined as the minimum sum of the squares of the distances of each laser point from the horizontal plane. The datum reference plane is recorded as plane III. The absolute value of the difference between the distances from plane I to plane III and from plane I to plane II is taken as the top surface flatness.

[0064] The plane where the three laser sensors in the left laser group are located is taken as side I, and side II is established based on the laser point positions of the left laser group. The base reference side is defined as the side where the sum of the squares of the distances of the laser points to the side is the smallest. The base reference side is recorded as side III, and the absolute value of the difference between the distances from side I to side III and from side I to side II is taken as the flatness of the left side.

[0065] as well as,

[0066] When the specimen is placed obliquely, the horizontal tilt angle is calculated based on the distance measured by two laser sensors located on the same horizontal plane in the left laser group or the right laser group and the distance between the two laser sensors according to trigonometric functions. The vertical tilt angle is calculated based on the distance measured by a group of front and rear laser sensors in the upper laser group or the lower laser group and the distance between the front and rear sensors of the laser group used according to trigonometric functions.

[0067] The distance between the two laser sensors is known. Figure 3For example, the horizontal tilt angle can be solved by the difference between i and h using the Pythagorean theorem and trigonometric functions, and the vertical tilt angle can be calculated by the difference between a and d.

[0068] Project the left laser group or the right laser group according to the horizontal tilt angle, and project the upper laser group or the lower laser group according to the vertical tilt angle. Define plane I, plane II, plane III, side I, side II and side III respectively according to the method when placed upright. The absolute value of the distance difference between side I and side III and side I and side II is used as the flatness of the left side, and the absolute value of the distance difference between plane I and plane III and plane I and plane II is used as the flatness of the top surface. This part can be calculated according to the algorithm of the prior art, and the laser sensor only needs to output data.

[0069] Step 6: When the test piece is placed upright, the angle between the surfaces is taken as the angle between the laser points of the two horizontal laser sensors in the left laser group or the right laser group and the laser points of the front and rear laser sensors on the same side in the upper laser group or the lower laser group; the angle between the surfaces is taken as the angle between the laser points of the two horizontal laser sensors in the front laser group and the laser points of the left and right laser sensors on the same side in the upper laser group or the lower laser group;

[0070] When the test piece is placed obliquely, the angle between the surfaces is taken as the angle between the line connecting the laser points of the two vertical sensors of the left laser group or the right laser group and the line connecting the laser points of the left and right laser sensors on the same side in the upper laser group and the lower laser group; the angle between the surfaces is taken as the angle between the laser points of the two vertical laser sensors in the front laser group and the line connecting the laser points of the front and rear laser sensors in the upper laser group or the lower laser group.

[0071] As a preferred embodiment of the present application, the method further includes step 7: calculating the right side flatness according to the calculation method of the left side flatness in step 5, and calculating the bottom side flatness according to the calculation method of the top side flatness in step 5. That is, the right side flatness and the top side flatness are detected in the same way.

[0072] As a preferred embodiment of the present application, when the specimen is placed upright, the horizontal load distance is used as the horizontal edge length, and the vertical load distance is used as the vertical edge length; when the specimen is placed obliquely, the horizontal edge length and vertical edge length of the specimen are calculated based on the horizontal load distance and the vertical load distance combined with the horizontal tilt angle and the vertical tilt angle. The edge length also falls within the range of concrete measurement to ensure the accuracy of the test block.

[0073] As a preferred embodiment of the present application, the upper laser group and the lower laser group can be moved simultaneously during measurement, and steps 2 to 5 are repeated to obtain several groups of data, and the measurement results are output according to the weighted average value of each group of data. According to multiple groups of results, the influence of errors can be reduced and the credibility of the results can be improved.

[0074] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0075] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A device for measuring the surface flatness and angle of a concrete test block, comprising a test stand, wherein the test stand is provided with a test hole for placing the test block, and wherein: The detection hole is surrounded by: An upper laser group, composed of four laser sensors, is used to emit a light beam vertically to the top surface of the test block and form laser points on the top surface of the test block, and the laser points are connected in sequence to form a rectangle; A lower laser group, consisting of four laser sensors, each laser sensor is aligned with a laser sensor in the upper laser group, and the lower laser group is used to emit a light beam vertically to the bottom surface of the test block and form a laser spot on the bottom surface of the test block; The left laser group is composed of three laser sensors, and is used to emit a light beam vertically to the left side of the test block and form a laser point on the left side of the test block, and the laser points are connected in sequence to form an L shape; The right laser group is composed of three laser sensors, each laser sensor is aligned with a laser sensor in the left laser group, and the right laser group is used to emit a light beam vertically to the right side of the test block and form a laser point on the right side of the test block; The front laser group is composed of three laser sensors. The front laser group is used to emit a light beam vertically to the front of the test block and form three laser points in front of the test block corresponding to the laser point height and spacing of the left laser group. The three laser points are connected in sequence to form an L shape.

2. A device for measuring the surface flatness and angle of a concrete test block according to claim 1, characterized in that: The upper laser group and the lower laser group are respectively connected with moving arms.

3. A device for measuring the surface flatness and angle of a concrete test block according to claim 2, characterized in that: The detection hole is recessed downward from the surface of the detection base, and includes a first detection plane at the top and a second detection plane at the bottom. The size of the first detection plane is 15cm×15cm, and the size of the second detection plane is 10cm×10cm. The first detection plane and the second detection plane are transitioned by a slope, and the first detection plane and the surface of the detection base are transitioned by a slope.

4. The device for measuring the surface flatness and angle of a concrete test block according to claim 3, characterized in that: The distance from the upper laser group to the detection hole is equal to the sum of the distance from the lower laser group to the detection hole and the edge length of the standard test piece; The distance from the left laser group to the vertical extension surface of the left side of the detection hole is equal to the distance from the right laser group to the vertical extension surface of the right side of the detection hole and the distance from the front laser group to the vertical extension surface of the front side of the detection hole.

5. A method for measuring the surface flatness and angle of a concrete test block according to the device of claim 4, characterized in that: The following steps are involved: Step 1: Adjust the positions of the upper laser group and the lower laser group according to the edge length of the standard test block corresponding to the test block to be measured; Step 2: Measure the horizontal distance from the left laser group to the right laser group, and record this distance as the horizontal no-load distance; place the test block to be measured in the detection hole, measure the distance from the left laser group to the left side of the test block and the distance from the right laser group to the right side of the test block, and obtain the three groups of corresponding left distances and right distances; as well as, Measure the vertical distance between the upper laser group and the lower laser group, record this distance as the vertical no-load distance, measure the distance from the upper laser group to the top surface of the test block and the distance from the lower laser group to the bottom surface of the test block, and obtain the upper side distance and lower side distance of the three groups corresponding to each other; Step 3: Use the horizontal no-load distance to subtract the left distance and the right distance to get three sets of horizontal loaded distances; use the vertical no-load distance to subtract the upper distance and the lower distance to get three sets of vertical loaded distances; Step 4: Compare the numerical differences of the three groups of horizontal load distances and the numerical differences of the three groups of vertical load distances to see if they are all within the error range, or compare the three groups of left distances and the three groups of right distances to see if they are all within the error range; if so, determine that the specimen is placed in the correct position; if not, calculate the sum of the left distance and the right distance of each group and the sum of the upper distance and the lower distance of each group, and determine whether the differences of the three summation results are all within the allowable range. If so, determine that the specimen is placed in an oblique position; if not, discard the measurement result and check the position of the test block and the laser group; Step 5: When the specimen is placed in the upright position, the plane where the four laser sensors in the upper laser group are located is plane I. Plane II is established based on the laser point position of the upper laser group. The datum reference plane is defined as the minimum sum of the squares of the distances of each laser point from the horizontal plane. The datum reference plane is recorded as plane III. The absolute value of the difference between the distances from plane I to plane III and from plane I to plane II is taken as the top surface flatness. The plane where the three laser sensors in the left laser group are located is taken as side I, and side II is established based on the laser point positions of the left laser group. The base reference side is defined as the side where the sum of the squares of the distances of the laser points to the side is the smallest. The base reference side is recorded as side III, and the absolute value of the difference between the distances from side I to side III and from side I to side II is taken as the flatness of the left side. as well as, When the specimen is placed in an oblique state, the horizontal tilt angle is calculated according to the distance measured by the two laser sensors located in the same horizontal plane in the left laser group or the right laser group and the distance between the two laser sensors according to trigonometric functions; the vertical tilt angle is calculated according to the distance measured by a group of front and rear laser sensors in the upper laser group or the lower laser group and the distance between the front and rear laser sensors of the laser group used according to trigonometric functions; the left laser group or the right laser group is projected according to the horizontal tilt angle, and the upper laser group or the lower laser group is projected according to the vertical tilt angle, and plane I, plane II, plane III, side I, side II and side III are defined respectively according to the method when placed upright, and the absolute value of the distance difference between side I and side III and between side I and side II is used as the left side flatness, and the absolute value of the distance difference between plane I and plane III and between plane I and plane II is used as the top surface flatness; Step 6: When the test piece is placed upright, the angle between the surfaces is taken as the angle between the laser points of the two horizontal laser sensors in the left laser group or the right laser group and the laser points of the front and rear laser sensors on the same side in the upper laser group or the lower laser group; the angle between the surfaces is taken as the angle between the laser points of the two horizontal laser sensors in the front laser group and the laser points of the left and right laser sensors on the same side in the upper laser group or the lower laser group; When the test piece is placed obliquely, the angle between the surfaces is taken as the angle between the line connecting the laser points of the two vertical sensors of the left laser group or the right laser group and the line connecting the laser points of the left and right laser sensors on the same side in the upper laser group and the lower laser group; the angle between the surfaces is taken as the angle between the laser points of the two vertical laser sensors in the front laser group and the line connecting the laser points of the front and rear laser sensors in the upper laser group or the lower laser group.

6. A method for measuring the surface flatness and angle of a concrete test block according to claim 5, characterized in that: The method further includes step seven: calculating the right side surface flatness according to the calculation method of the left side surface flatness in step five, and calculating the bottom surface flatness according to the calculation method of the top surface flatness in step five.

7. A method for measuring the surface flatness and angle of a concrete test block according to claim 5, characterized in that: When the specimen is placed upright, the horizontal load distance is taken as the horizontal edge length, and the vertical load distance is taken as the vertical edge length; When the specimen is placed obliquely, the horizontal edge length and vertical edge length of the specimen are calculated based on the horizontal load distance and the vertical load distance combined with the horizontal tilt angle and the vertical tilt angle.

8. A method for measuring the surface flatness and angle of a concrete test block according to any one of claims 5 to 7, characterized in that: Move the upper laser group and the lower laser group at the same time, repeat steps 2 to 5 to obtain several groups of data, and output the measurement result according to the weighted average value of each group of data.

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