CN116929257B - Surface roughness acquisition method of prefabricated composite shear wall based on measuring endoscope - Google Patents

Abstract

The invention discloses a method for acquiring surface roughness of a prefabricated superimposed shear wall based on a measurement type endoscope, which is characterized in that a light steel sliding rail is fixed in an inner cavity of the prefabricated superimposed shear wall at the height of a detection position, an acquisition vehicle capable of sliding back and forth along the length direction of the light steel sliding rail is arranged on the light steel sliding rail, a probe of the endoscope is fixed on the acquisition vehicle, the probe is sent into the inner cavity of the prefabricated superimposed shear wall by the acquisition vehicle and the light steel sliding rail, a measuring lens arranged on the probe is used for carrying out static shooting and single measurement on a groove of a rough surface, the acquisition vehicle is continuously moved after the measurement is finished, and then the static shooting and the single measurement are carried out on other grooves on the rough surface. The invention has the advantages of convenient and fast acquisition, accurate data and small field labor intensity.

Description

Surface roughness acquisition method of prefabricated composite shear wall based on measuring endoscope

Technical field

The invention relates to the technical field of prefabricated building inspection, and specifically relates to a method for collecting surface roughness of prefabricated superimposed shear walls based on a measuring endoscope.

Background technique

In recent years, the country's requirements for the assembly rate of prefabricated concrete structures have continued to increase. Therefore, in addition to the "three boards", vertical load-bearing prefabricated components need to be used, and prefabricated shear walls have become the main force. Among them, the prefabricated composite shear wall is a new type of component. It is made up of two concrete wall panels. There is a cavity between the panels. After it is installed on site, concrete is poured in the cavity to form a whole. , also known as "double skin wall". Compared with ordinary precast shear walls, it has the advantages of convenient vertical steel bar connection, good integrity, and easy control of on-site construction quality. However, existing research has shown that the quality of the bonding surface between old and new concrete within precast composite shear walls is a key factor affecting the overall shear and seismic performance. For the quality defects of the joint surface, ultrasonic method and core drilling method can be used to detect, and the operation is relatively convenient. When the test results show that there are no obvious quality defects on the joint surface, there is indeed no problem. However, when the test results show that there are obvious defects in the joint surface, it is very difficult to dismantle, rework or reinforce the formed wall. Therefore, this method of post-mortem detection has obvious disadvantages.

Through extensive research on the quality defects of the joint surface of new and old concrete in precast composite shear walls, it was found that the roughness of the old concrete surface at the joint surface is a key factor affecting the later bonding quality. The greater the roughness at the joint surface, the greater the The better the bonding surface quality. Therefore, before pouring concrete, the roughness of the two inner surfaces of the prefabricated composite shear wall can be tested first, and it can be used on the project site only after it is qualified.

Prefabricated composite floors, composite beams, etc. have testing requirements for the surface roughness itself. According to different roughness information collection principles, detection methods mainly include "filling method", "depth ruler method" and "three-dimensional scanning method". When conducting roughness testing on prefabricated composite shear walls, the following two factors need to be considered: (1) The prefabricated composite shear wall is composed of two prefabricated wall panels through truss bars. An inner cavity is formed between them that needs to be poured later. The width of the inner cavity, that is, the distance between the two precast wall panels, is usually only 100mm; (2) The precast composite shear wall is placed vertically in the component storage area. The joint surface between old and new concrete in the composite shear wall is a vertical surface.

The following analyzes the applicability of the "filling method", "depth ruler method" and "three-dimensional scanning method" in the roughness detection of precast composite shear walls one by one. For the "filling method", the main filling methods include sand filling, wood chips, iron beads, plasticine filling method, etc. This method collects roughness information and requires the joint surface to be in a horizontal state, so it cannot be applied to prefabricated composite shear walls. . For the "depth ruler method", the depth ruler is mainly used for direct measurement or used with a porous reference plate. Although this method can be applied to the vertical joint surface, the length of the depth ruler is close to 100mm, which is required when operating the hand-held depth ruler. The width of the space must exceed 100mm. The distance between the two prefabricated wall panels is not enough for inspection, and because the hand is not long enough, it cannot reach the middle of the wall for inspection, so the depth gauge method cannot be applied to prefabricated stack shears. force wall. The "three-dimensional scanning method" is currently the most advanced means of collecting roughness information of precast composite floor slabs. The advantages of this method are fast on-site data collection and high measurement accuracy. Although the joint surface of the precast composite shear wall is The joint surface of the prefabricated composite floor slab is very similar in concave and convex shape, but there is no obstruction directly above the joint surface of the prefabricated composite floor slab. The 3D laser scanner can freely scan and collect information, while the two inner cavities of the prefabricated composite shear wall face each other. The distance between the set joint surfaces is only 100mm, which cannot accommodate three-dimensional laser scanning equipment. Therefore, the three-dimensional scanning method cannot be applied to prefabricated composite shear walls.

In summary, the three main existing roughness detection methods are not suitable for precast composite shear walls, which is one of the reasons why there is no requirement to detect the inner surface roughness of precast composite shear walls. In view of this, it is necessary to develop a new method for information collection on the roughness of the inner surface joint surface of precast composite shear walls.

Contents of the invention

The technical problem to be solved by this invention is to provide a method for collecting surface roughness of prefabricated superimposed shear walls based on a measuring endoscope, which has the advantages of convenient collection, accurate data, and low on-site labor intensity.

In order to solve the above technical problems, the present invention provides a method for collecting the surface roughness of a prefabricated composite shear wall based on a measuring endoscope. The light steel slide rail is fixed to the prefabricated composite shear wall at the height of the detection position. In the inner cavity, the light steel slide rail is equipped with a moving collection car that can slide back and forth along its length direction. The probe of the endoscope is fixed on the collection car. The collection car and the light steel slide rail are used to send the probe into the prefabricated superimposed shear. In the inner cavity of the force wall, the measurement lens installed on the probe is used to take static shots and single measurements of the grooves on the rough surface. After the measurement, continue to move the collection vehicle, and then take static shots and single measurements of other grooves on the rough surface;

When measuring a single groove in the captured image, use the depth profile measurement function of the endoscope to select the first reference point and the second reference point respectively on the flat places on both sides of the single groove to establish a depth profile. The line connecting the datum points is the zero datum line of the depth profile; find and select the lowest point of the groove in the depth profile, and obtain the distance from that point to the zero datum line, which is the depth value D of the lowest point. In the depth profile Find and select the highest point on both sides of the groove in the figure, obtain the distance from this point to the zero baseline, which is the height value G of the highest point, and calculate the maximum concave and convex depth value of the groove U=D+G.

Further, the measurement lens installed on the probe of the endoscope is a side-view measurement lens, and the field of view angle of the side-view measurement lens is not less than 55°.

Furthermore, before taking static shots of the grooves on the rough surface, push the collection vehicle to move so that the collection vehicle slides on the light steel slide rail. When the grooves on the rough surface enter the screen of the endoscope, slow down the movement speed. By pushing and pulling the collection cart so that the groove is in the middle of the screen and maintaining this position, use the image capture function of the endoscope to capture images.

Further, after fixing the endoscope probe on the collection vehicle, measure the distance from the surface of the lens to the surface of the inner cavity facing it to be 35-40mm, and the area of the image taken should not be less than 30mm*30mm.

Furthermore, light steel slide rails are installed at different heights of the precast composite shear wall to collect roughness information at different heights of the precast composite shear wall.

Furthermore, the collection vehicle can rotate along the circumferential direction of the light steel slide rail. After collecting the roughness information of the first surface in the inner cavity of the prefabricated composite shear wall, when it is necessary to collect the roughness information of the second surface, Rotate the collection cart so that the endoscope's probe view is facing the second surface in the lumen.

Furthermore, clamps are provided at both ends of the light steel slide rail. The clamps are clamped and fixed on the sides of the prefabricated composite shear wall and fix the light steel slide rail inside the prefabricated composite shear wall.

Further, the light steel slide rail and the clamp are locked with screws.

Beneficial effects of the present invention:

1. Cleverly build slide rails in the narrow inner cavity of the prefabricated composite shear wall, and use the probe of the measuring endoscope loaded on the collection vehicle to measure the concave and convex depth values of the rough surfaces of the representative parts, thus solving the existing roughness problem. The degree detection method is aimed at the problem that rough surface information of prefabricated superimposed shear walls cannot be collected.

2. This method uses a three-dimensional measurement endoscope to collect roughness information. The image is intuitive. It performs refined measurements on a single groove and has high detection accuracy. Through the setting of the slide rail, the originally unsuitable implementation conditions are transformed into controllable ones. , stable and smooth collection method, low labor intensity, fast collection speed, true and reliable data.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure in the collection process of the present invention;

Figure 2 is a schematic diagram of the cooperation structure between the light steel slide rail, the collection vehicle and the prefabricated composite shear wall according to the present invention;

Figure 3 is an interface diagram of images captured by an endoscope;

Figure 4 is an operation diagram for endoscope function selection;

Figure 5 is an operation diagram of reference point selection;

Figure 6 is an operation diagram for the endoscope to find and detect the lowest point position;

Figure 7 is an operation diagram of the endoscope searching for and detecting the highest point position.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific examples, so that those skilled in the art can better understand and implement the present invention, but the examples are not intended to limit the present invention.

Referring to Figures 1 and 2, one embodiment of the surface roughness collection method of prefabricated superimposed shear walls based on a measurement endoscope of the present invention mainly uses an endoscope to assist in collecting roughness information. Specifically, in The light steel slide rail 1 is fixed in the inner cavity of the prefabricated composite shear wall 2 at the height of the detection position. The light steel slide rail is provided with a collection car 3 that can slide back and forth along its length direction. The probe 4 of the endoscope is fixed. On the collection vehicle, the collection vehicle and light steel slide rails are used to send the probe into the inner cavity of the prefabricated composite shear wall. The measurement lens 5 installed on the probe is used to photograph the rough surface in the inner cavity and collect roughness data.

Specifically, during the collection process, it is first necessary to determine the collection position on the prefabricated composite shear wall, illuminate the inner cavity of the prefabricated composite shear wall with a flashlight and observe it. According to the height of the wall and the rough surface inside the wall, For the groove position, select at least two locations for collection. When there are two collection locations, you can select the upper and lower sides of the middle part of the wall. When there are three collection locations, you can select the middle part of the wall and the upper side of the middle part. and the lower side. After selecting the position, use a steel tape measure to measure and mark both sides of the prefabricated composite shear wall of the corresponding height to obtain the installation position identification of the light steel slide rail. According to the installation position identification, place the light steel The slide rail can be fixed;

After fixation, install the endoscope probe on the collection vehicle, and install a measurement lens on the probe. A side-view measurement lens can be installed here. The field-of-view angle of the side-view measurement lens is not less than 55°, which is convenient for use in narrow wall cavities. To capture images in the center, after the probe is installed on the collection vehicle, the side-view measurement lens faces the rough surface to be collected, and the distance from the rough surface to be captured is between 35-40mm. The area of the captured image is not less than 30mm*30mm, which meets the requirements Shooting requirements;

Then the collection vehicle can be pushed to slide along the light steel slide rail. During the sliding process, a groove is arbitrarily determined on the rough surface near the starting position of the sliding as the first detection object. The first detection object enters the inside When the endoscope is in the screen, the collection vehicle remains stationary, keeping this position unchanged, and is ready for static shooting. Refer to Figure 3, and then use the endoscope to capture the image of the single groove and calculate the maximum concave and convex depth of the groove. ;

The above method of capturing images and calculating the maximum concave-convex depth of grooves is as follows: When measuring a single groove in the captured image, click the stereo function key on the interface, and then select the depth profile measurement function, as shown in Figure 4, and then Select the first datum point and the second datum point respectively at the relatively flat places on both sides of the groove. Refer to Figure 5. Click the view function key on the interface to create a depth profile. The line connecting the two datum points is the depth profile. The zero baseline; find and select the lowest point of the groove in the depth profile, refer to Figure 6, automatically obtain the distance from this point to the zero baseline, which is the depth value D of the lowest point, and click the screenshot button to intercept A picture containing the depth value of the lowest point of the groove; find and select the highest point on both sides of the groove in the depth profile, as shown in Figure 7, automatically obtain the distance from this point to the zero baseline, which is the height value of the highest point G, and click the screenshot button to capture the picture containing the depth value of the highest point, and calculate the maximum bump depth value of the groove U=D+G.

After the end, continue to push the collection car to slide, and continue to randomly determine a groove as the second detection object during the movement. When the second detection object enters the endoscope screen, the collection car remains stationary and keeps the position unchanged. Carry out static photography, and then use an endoscope to capture an image of a single groove and calculate the maximum concave and convex depth of the groove. The method of photographing the image and calculating the maximum concave and convex depth of the groove refers to the method of the first groove, and repeatedly finds the concave and convex depth. The groove is collected as a detection object until the number of collections is met, and the collection of the first rough surface in the inner cavity and the current collection height is completed;

Then rotate the collection car 180 degrees so that the side-view measurement lens of the endoscope faces the other surface at the current collection position. Reset the collection car to the initial position, continue to push the collection car, and repeat the above collection steps for one surface. , complete the collection of the second rough surface in the inner cavity and the current collection height;

Subsequently, the light steel slide rails are dismantled, and then the light steel slide rails are installed at the next collection position and data collection is performed. The surface concave and convex depth values of other height positions of the prefabricated composite shear wall are obtained.

During the above operation process, after the installation of the light steel slide rail is completed, the collection vehicle can be pushed and pulled, and the endoscope can be operated and tested; specifically, the collection vehicle can be pushed and pulled through the full stroke to ensure smooth movement of the collection vehicle. Then open the endoscope, randomly select an area, and observe whether the viewing angle of the image displayed is good, that is, whether the viewing angle in the image displayed by the endoscope is facing the rough surface of the inner cavity; it is also necessary to observe whether the area of the collected area is at least 30mm*30mm, is the picture clear? Because the width of the groove on the rough surface is usually 5-8 mm, and the distance between adjacent grooves is usually about 30 mm. When the area of the collection is larger than 30mm*30mm, it can ensure that there is a The groove and the flat parts on both sides of the groove are in the picture, and can be collected after meeting the above requirements;

If the image collected is not good, you need to adjust the probe installation position and test again until the test effect is good.

In the fixation of the above-mentioned light steel slide rails, the clamps 11 set at both ends can be used. The clamps are fixed on the sides of the prefabricated composite shear wall and the light steel slide rails are fixed inside the prefabricated composite shear wall. The light steel slide rail and the clamp are locked with screws. By loosening and fixing the screws, the light steel slide rail can be rotated, that is, the collection vehicle will rotate accordingly, thereby achieving the purpose of quickly adjusting the position of the collection vehicle, and the orientation of the probe will also change accordingly.

This method cleverly solves the problem of prefabricated superimposed shear wall by building slide rails in the narrow inner cavity of the prefabricated superimposed shear wall, and using the collection vehicle to carry a measurement-type endoscope probe to measure the concave and convex depth values of the rough surfaces of its representative parts. It is difficult to collect information on the rough surface of the wall. It can be operated by a single person during collection. The operation is easy, stable and reliable. This method uses a three-dimensional measurement endoscope to collect roughness information, and the image is intuitive. It is worth mentioning that this method uses close-range shooting and refined measurement of a single groove, with high detection accuracy and true and reliable data. If a single endoscope probe is used to shoot a large area at a long distance, because the endoscope imaging is a single imaging at a fixed angle, it is different from the point cloud data accumulation imaging of multi-angle scanning by a 3D laser scanner. It is impossible to collect the complete information of multiple grooves at the shooting angle. This method takes a close-up shot of a specific single groove, which is conducive to fully collecting all the information of the groove, supplemented by refined measurement calculations. The detection accuracy is greatly improved.

The above embodiments are only preferred embodiments to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be determined by the claims.

Claims (8)

1. A method for collecting surface roughness of prefabricated composite shear walls based on a measuring endoscope, which is characterized in that light steel slide rails are fixed in the inner cavity of the prefabricated composite shear wall at the height of the detection position, The light steel slide rail is equipped with a collection car that can slide back and forth along its length direction. The probe of the endoscope is fixed on the collection car. The collection car and the light steel slide rail are used to send the probe into the inner cavity of the prefabricated composite shear wall. , use the measurement lens installed on the probe to take static shots and single-line measurements of the grooves on the rough surface. After the measurement, continue to move the collection vehicle, and then take static shots and single-line measurements of other grooves on the rough surface; When measuring a single groove in the captured image, use the depth profile measurement function of the endoscope to select the first reference point and the second reference point respectively on the flat places on both sides of the single groove to establish a depth profile. The line connecting the datum points is the zero datum line of the depth profile; find and select the lowest point of the groove in the depth profile, and obtain the distance from that point to the zero datum line, which is the depth value D of the lowest point. In the depth profile Find and select the highest point on both sides of the groove in the figure, obtain the distance from this point to the zero baseline, which is the height value G of the highest point, and calculate the maximum concave and convex depth value of the groove U=D+G. 2. The method for collecting surface roughness of prefabricated superimposed shear walls based on a measurement endoscope as claimed in claim 1, characterized in that the measurement lens installed on the probe of the endoscope is a side-view measurement lens, The field of view angle of the side-view measurement lens is not less than 55°. 3. The surface roughness collection method of prefabricated superimposed shear walls based on measurement endoscopes as claimed in claim 1, characterized in that before static photography of the grooves on the rough surface, the collection vehicle is first pushed to move so that The collection car slides on the light steel slide rail. When the groove on the rough surface enters the screen of the endoscope, slow down the movement speed. By pushing and pulling the collection car, the groove is located in the middle of the screen and the position remains unchanged. Use the endoscope's image capture function to capture images. 4. The method for collecting surface roughness of prefabricated superimposed shear walls based on measurement endoscopes as claimed in claim 1, characterized in that after the probe of the endoscope is fixed on the collection vehicle, the surface of the measuring lens is brought to the normal position. The distance between the surfaces of the inner cavity is 35-40mm, and the area of the image taken is not less than 30mm*30mm. 5. The method for collecting surface roughness of prefabricated composite shear walls based on measurement endoscopes as claimed in claim 1, characterized in that light steel slide rails are installed at different heights of the prefabricated composite shear walls. To collect roughness information at different heights of prefabricated composite shear walls. 6. The surface roughness collection method of prefabricated laminated shear walls based on measurement endoscopes as claimed in claim 1, characterized in that the collection vehicle can rotate along the circumferential direction of the light steel slide rail. When the prefabricated laminated shear wall is collected, Combined with the roughness information of the first surface in the inner cavity of the shear wall, when it is necessary to collect roughness information on the second surface, rotate the collection car so that the angle of view of the endoscope's probe faces the second surface in the inner cavity. . 7. The method for collecting surface roughness of prefabricated superimposed shear walls based on measurement endoscopes as claimed in claim 6, characterized in that clamps are provided at both ends of the light steel slide rail, and the clamps are Fix it on the side of the precast composite shear wall and fix the light steel slide rail inside the precast composite shear wall. 8. The method for collecting surface roughness of prefabricated superimposed shear walls based on measurement endoscopes according to claim 7, characterized in that the light steel slide rail and the clamp are locked by screws.