Concrete construction joint acceptance method and equipment

Abstract

The invention provides an acceptance method and equipment for a concrete construction joint, and the method comprises the steps: obtaining the point cloud data of the surface of the construction joint after the concrete construction joint is coated with a retarder and is subjected to roughening in a final setting stage, and reconstructing a three-dimensional surface topography model of the surface of the construction joint according to the point cloud data; performing triangular meshing on the three-dimensional surface topography model to obtain the area of each triangular mesh surface and the projection area of each triangular mesh surface on the concrete construction joint plane; the ratio of the total area and the total projection area of all the triangular mesh faces is obtained to serve as a current roughness evaluation index of the surface of the construction joint; and according to the current roughness evaluation index and a preset construction quality requirement, generating an acceptance opinion of the construction joint. The quantitative roughness evaluation index is obtained based on the point cloud data of the surface of the construction joint, and acceptance is performed according to the roughness evaluation index, so that whether the construction joint treatment meets the requirement can be quickly and accurately judged, and the construction quality of the concrete construction joint and the stability and reliability of the structural performance are ensured.

Description

Technical Field

[0001] The present application relates to concrete construction technology, and in particular to a method and equipment for inspecting and accepting concrete construction joints. Background Art

[0002] Construction joints refer to the joints formed between the first and last poured concretes during the concrete pouring process due to design requirements or construction needs. The quality of its treatment is crucial to the integrity, impermeability, and even structural safety of the concrete structure. The treatment of construction joints is essentially a problem of interfacial bonding between new and old concrete. Under the same stress conditions, the bonding surface of new and old concrete is weaker than the mortar-bone interface in the whole cast concrete system, and the bonding strength is generally only about 50% of the strength of the whole cast concrete, which reduces the tensile and shear strength of the concrete structure. Therefore, whether the bonding surface at the construction joint is good determines the success or failure of the project.

[0003] The bonding effect of the joint surface at the construction joint is greatly affected by the interface roughness. The existing technology mostly improves the mechanical properties of the joint surface through roughening treatment. However, the existing roughening treatment technology and detection methods have certain limitations. In actual engineering, the roughening treatment technology mainly includes manual chiseling, mechanical chiseling, pulling, and punching. Among them, the punching method is widely used and has the best effect, but it requires a high water pressure (generally 10~30MPa), and the construction fan is small, which is more dangerous and has low construction efficiency. Especially when the concrete strength is high, the punching can only process the surface slurry, and it is difficult to achieve deep chiseling, which limits the roughening treatment effect. In terms of detection methods, the roughness of the construction joint joint surface is generally qualitatively characterized by subjective descriptions such as rough and very rough through visual inspection. The error is large and the accuracy and consistency of the detection cannot be ensured. As a result, when applied on site, the quality control of construction joint treatment often relies on the experience of construction personnel, and it is difficult to form a scientific and quantifiable evaluation standard, which can easily lead to the concrete construction joint becoming a weak surface that destroys the integrity of the concrete structure. Summary of the invention

[0004] The present application provides a method and equipment for acceptance of concrete construction joints, so as to improve the accuracy of detection of surface roughness of construction joints.

[0005] In a first aspect, the present application provides a method for acceptance of concrete construction joints, comprising:

[0006] After the concrete construction joint is coated with a retarder and roughened in the final setting stage, point cloud data of the construction joint surface is obtained, and a three-dimensional surface morphology model of the construction joint surface is reconstructed according to the point cloud data;

[0007] Performing triangulation on the three-dimensional surface topography model to obtain a plurality of triangular mesh surfaces, and obtaining the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane;

[0008] Obtaining the total area and total projection area of ​​all triangular mesh surfaces, and determining the ratio of the total area to the total projection area of ​​all triangular mesh surfaces as a current roughness evaluation index of the construction joint surface;

[0009] An acceptance opinion of the construction joint is generated according to the current roughness evaluation index and the preset construction quality requirements.

[0010] In a second aspect, the present application provides a concrete construction joint acceptance device, comprising:

[0011] An acquisition module is used to acquire point cloud data of the surface of the concrete construction joint after the concrete construction joint is coated with a retarder and roughened in the final setting stage;

[0012] A point cloud processing module is used to reconstruct a three-dimensional surface morphology model of the construction joint surface according to the point cloud data; triangulate the three-dimensional surface morphology model to obtain a plurality of triangular mesh surfaces, and obtain the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane;

[0013] A roughness evaluation module is used to obtain the total area and total projection area of ​​all triangular mesh surfaces, and determine the ratio of the total area of ​​all triangular mesh surfaces to the total projection area as a current roughness evaluation index of the construction joint surface;

[0014] The acceptance module is used to generate an acceptance opinion of the construction joint according to the current roughness evaluation index and the preset construction quality requirements.

[0015] In a third aspect, the present application provides an electronic device, comprising: a processor, and a memory communicatively connected to the processor;

[0016] The memory stores computer-executable instructions;

[0017] The processor executes the computer-executable instructions stored in the memory to implement the method according to the first aspect.

[0018] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method described in the first aspect.

[0019] In a fifth aspect, the present application provides a computer program product, including a computer program, which implements the method described in the first aspect when executed by a processor.

[0020] The acceptance method and equipment of concrete construction joints provided in the present application obtain point cloud data of the surface of the construction joint after the concrete construction joint is coated with a retarder and roughened in the final setting stage, and reconstruct a three-dimensional surface morphology model of the construction joint surface according to the point cloud data; the three-dimensional surface morphology model is triangulated to obtain multiple triangular mesh surfaces, and the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the plane of the concrete construction joint are obtained; the total area and the total projection area of ​​all triangular mesh surfaces are obtained, and the ratio of the total area of ​​all triangular mesh surfaces to the total projection area is determined as the current roughness evaluation index of the construction joint surface; according to the current roughness evaluation index and the preset construction quality requirements, the acceptance opinion of the construction joint is generated. In the embodiment of the present application, a quantitative roughness evaluation index is obtained based on the point cloud data of the construction joint surface, and acceptance is performed according to the roughness evaluation index, which can quickly and accurately determine whether the construction joint treatment meets the requirements, and ensure the stability and reliability of the construction quality and structural performance of the concrete construction joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] Figure 1 A schematic diagram of a scene of a method for acceptance of concrete construction joints provided in an embodiment of the present application;

[0023] Figure 2 A flow chart of a method for accepting concrete construction joints provided in one embodiment of the present application;

[0024] Figure 3 A schematic diagram of a three-dimensional surface morphology model of a concrete test block provided in one embodiment of the present application;

[0025] Figure 4 A schematic diagram of a second mapping relationship between a roughness evaluation index (bonding area ratio) and an average depth of sand filling provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of a first mapping relationship between a roughness evaluation index (bonding area ratio) and a splitting tensile strength provided in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of a concrete construction joint acceptance device provided in one embodiment of the present application;

[0028] Figure 7 A schematic diagram of an electronic device provided in accordance with an embodiment of the present application.

[0029] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0031] Whether the bonding of the construction joint is good or not determines the success or failure of the project. The bonding effect of the construction joint is mainly affected by the interface roughness, interface agent performance and other conditions. The existing technology mostly improves the mechanical properties of the bonding surface by roughening treatment and using interface adhesives. There are the following problems:

[0032] Limitations of existing roughening treatment technology: In actual projects, the roughening treatment methods for the surface of construction joints mainly include manual roughening, mechanical roughening, roughening, and flushing. Among them, manual roughening is to roughen the concrete surface manually, which is flexible to operate, but inefficient, labor-intensive, and easily causes fine cracks inside the old concrete; mechanical roughening uses mechanical equipment such as a roughening machine to perform roughening treatment, which can improve construction efficiency, but the equipment cost is high, and there is a lot of noise and dust pollution during the construction process; roughening is to use a brush machine or a manual brush to remove cement slurry. This method has requirements for concrete strength and has a limited scope of application; and the flushing method uses a spray gun to remove cement latex on the surface of old concrete with a high-pressure water jet. It has the advantages of high efficiency, good quality, strong economy, and little disturbance to the interior of the concrete. Therefore, it is very suitable for roughening the surface of concrete construction joints. However, the existing flushing technology requires a high water pressure (generally 10~30MPa), and the construction fan is small, which is more dangerous and has a low construction effect. Especially when the concrete strength is high, roughening can only treat the surface slurry and it is difficult to achieve deep roughening, which limits the roughening effect.

[0033] Lack of quantitative roughness detection: In the prior art, the surface roughness of construction joints can generally be qualitatively characterized by subjective descriptions such as rough and very rough through visual inspection, which has large errors, and different inspectors will produce different results, and the accuracy and consistency of the detection cannot be ensured; in addition, the surface roughness of construction joints can also be detected by the sand filling method in the prior art, but the sand filling method is often used in laboratories and cannot be applied to actual construction, and the accuracy is not high and the operation is complicated. Due to the inaccuracy of the surface roughness of construction joints, the quality control of construction joint treatment during on-site application often relies on the experience of construction personnel, and it is difficult to form a scientific and quantifiable evaluation standard, which can easily lead to concrete construction joints becoming weak surfaces that destroy the integrity of concrete structures.

[0034] In order to improve the accuracy of construction joint surface roughness detection, the embodiment of the present application provides a method for acceptance of concrete construction joints. After the concrete construction joints are coated with a retarder and roughened in the final setting stage, point cloud data of the construction joint surface is obtained, and a quantitative roughness evaluation index is obtained based on the point cloud data of the construction joint surface. The actual roughness of the construction joint surface can be comprehensively and objectively reflected, thereby improving the accuracy of detection. Acceptance is performed based on the roughness evaluation index, and whether the construction joint treatment meets the requirements can be quickly and accurately determined, thereby ensuring the construction quality of the concrete construction joint and the stability and reliability of the structural performance.

[0035] The specific application scenarios of this application are as follows Figure 1 As shown, after the concrete construction joint is coated with a retarder and roughened in the final setting stage, point cloud data of the construction joint surface is obtained by a point cloud acquisition device such as a 3D scanner, and a 3D surface morphology model of the construction joint surface is reconstructed based on the point cloud data; the 3D surface morphology model is triangulated to obtain multiple triangular mesh surfaces, and the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane are obtained; the total area and the total projection area of ​​all triangular mesh surfaces are obtained, and the ratio of the total area of ​​all triangular mesh surfaces to the total projection area is determined as the current roughness evaluation index of the construction joint surface; and the acceptance opinion of the construction joint is generated based on the current roughness evaluation index and the preset construction quality requirements.

[0036] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0037] Figure 2This is a flow chart of the acceptance method for concrete construction joints provided in the embodiment of the present application. This embodiment provides an acceptance method for concrete construction joints, the execution subject of which is an electronic device such as a computer or a server. The specific steps of the acceptance method for concrete construction joints are as follows:

[0038] S201, after the concrete construction joint is coated with a retarder and roughened in the final setting stage, obtaining point cloud data of the surface of the construction joint, and reconstructing a three-dimensional surface morphology model of the surface of the construction joint according to the point cloud data.

[0039] In this embodiment, in the scenario of layered and segmented concrete pouring, a retarder is applied to the surface of the concrete construction joint to extend the cement hydration latent period, thereby slowing down the hardening rate of the concrete surface while ensuring the quality of the concrete, and then roughening the surface of the construction joint when the concrete enters the final setting stage, that is, roughening is used to increase the roughness of the surface of the construction joint, so as to improve the bonding strength of the interface between the new and old concrete during the next pouring, thereby increasing the tensile and shear strength of the concrete structure.

[0040] Among them, the optional roughening processing methods used in this embodiment may include but are not limited to manual roughening, mechanical roughening, roughening, roughening, and punching.

[0041] Optionally, the retarder used in this embodiment can be any retarder, including but not limited to sodium hexametaphosphate, sodium citrate, modified phosphonate retarders (the main synthetic raw materials are diethylenetriamine and phosphorous acid), composite retarders of sodium citrate and modified phosphonate retarders, composite retarders of sodium tripolyphosphate and modified phosphonate retarders, etc. The comparison of the plasticizing effects of different retarders on cement paste is shown in Table 1 below:

[0042] Table 1

[0043]

[0044] In this embodiment, considering that traditional treatment methods such as manual chiseling, mechanical chiseling and pulling have limitations such as low efficiency and insufficient treatment depth, although the roughening method is relatively applicable, the high water pressure requirement and the small construction fan limit the construction efficiency, and it is difficult to achieve the ideal effect in large-scale operations, especially when the concrete strength is high, deep roughening cannot be achieved. The plasticizing effects of different retarders on cement paste are compared, and a composite retarder of sodium tripolyphosphate and modified phosphonate with the best retarding effect is preferably used, which can be used in an amount of 0.05-0.1%, effectively prolonging the latent period of cement hydration, while ensuring the quality of concrete, delaying the hardening speed of the concrete surface, so that it can use lower water pressure and a larger fan in the roughening treatment to still remove concrete with low surface strength, achieve a deep roughening effect, significantly improve construction efficiency, reduce construction risks, ensure the uniformity of construction joint roughness, improve the treatment quality of the construction joint interface, and enhance bonding performance.

[0045] More specifically, when applying the retarder to the concrete construction joint, different application methods can be selected according to the direction of the construction joint. For example, for the horizontal construction joint, the surface can be initially leveled after the concrete is poured, and then the super retarder can be evenly sprayed on the horizontal construction joint to ensure uniform coverage and extend the hardening time of the concrete surface. For the treatment of the circumferential construction joint, the retarder can be evenly applied to the formwork of the circumferential construction joint before the concrete is poured to ensure that the hardening speed of the side where the formwork contacts the concrete is delayed. The application must be uniform to avoid uneven local hardening.

[0046] When the concrete enters the final setting stage, a high-pressure water gun (water knife) is used to roughen the surface of the construction joint. The high-pressure water gun can use a lower water pressure (for example, lower than the preset water pressure) and a larger spray fan (for example, larger than the preset spray fan), remain perpendicular to the bonding surface, and move evenly, thereby effectively removing surface slurry and loose layers while reducing the risk.

[0047] Furthermore, after the surface roughening of the construction joint is completed, the point cloud data of the construction joint surface can be collected. A 3D scanner or other point cloud collection equipment can be used. It needs to have high resolution and high precision to meet the construction joint surface scanning requirements under complex on-site conditions. The entire surface area of ​​the construction joint needs to be covered during scanning to ensure that there are no omissions or blind spots to ensure the integrity and accuracy of the surface point cloud data. After the scan is completed, the obtained point cloud data is saved as a file in a standard format (such as PLY, OBJ or STL format) to ensure the versatility and portability of the data. The stored point cloud data file will serve as the basis for subsequent data processing and analysis.

[0048] After obtaining the point cloud data of the construction joint surface, the three-dimensional surface morphology model of the construction joint surface can be reconstructed based on the point cloud data. For example, the three-dimensional data visualization software can be used to reconstruct the obtained point cloud data to generate a three-dimensional surface morphology model of the construction joint surface, accurately reproduce its microscopic features, and lay the foundation for the extraction of roughness parameters.

[0049] Optionally, before reconstructing the point cloud data, one or more processes such as denoising, filtering and smoothing may be performed on the point cloud data to remove interfering data points during the scanning process. In addition, since it is usually impossible to cover the entire surface area of ​​the construction joint at one time when collecting point cloud data, it is necessary to collect data in different areas. Therefore, it is also necessary to apply data alignment and splicing algorithms to generate point cloud data of the complete construction joint surface to obtain a complete three-dimensional surface morphology model of the construction joint surface.

[0050] S202, triangulating the three-dimensional surface morphology model to obtain a plurality of triangular mesh surfaces, and obtaining the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane.

[0051] In this embodiment, after obtaining the three-dimensional surface morphology model of the construction joint surface, the three-dimensional surface morphology model can be triangulated to obtain multiple triangular mesh surfaces, that is, the three-dimensional surface morphology model becomes a surface model composed of many triangles after triangulation, wherein the triangulation can adopt any known meshing method, for example, the three-dimensional data open source library can be used to read the point cloud data, load and parse the mesh data, extract the vertex coordinates and the patch index, which correspond to the point set in the three-dimensional space and the triangular mesh surface connecting these points, respectively. Of course, this embodiment is not limited to triangulation, and other meshing methods can also be used.

[0052] Furthermore, considering that the bonding area on the construction joint surface is directly related to its bonding performance, a higher bonding area ratio indicates a larger actual contact area, which helps to improve the bonding strength and overall integrity of the construction joint, and can reflect the roughness of the construction joint surface. Therefore, in this embodiment, the bonding area ratio is used as the roughness parameter, that is, the ratio of the surface area of ​​the construction joint surface to its projected area on the concrete construction joint plane.

[0053] In this embodiment, the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane (for example, for a horizontal construction joint, the plane may be an xy plane) may be calculated.

[0054] In the specific implementation, for any of the triangular mesh surfaces or the projection of any of the triangular mesh surfaces on the concrete construction joint plane, determine its vertex coordinates, and determine any two edge vectors based on the vertex coordinates, and obtain half of the modulus of the cross product of the any two edge vectors as the corresponding area. The specific calculation formula is as follows:

[0055]

[0056]

[0057] Compute the vector cross product:

[0058]

[0059] Area of ​​a triangle Equal to half the magnitude of the vector cross product:

[0060]

[0061] The vertex coordinates are , , , and are two edge vectors. The calculation of the projection area is to set the vertex coordinate z value to 0, and the above method can also be used for calculation.

[0062] The above algorithm makes the calculation more direct, has higher efficiency and numerical stability, and is particularly suitable for batch processing of large amounts of triangular mesh data. Of course, other triangular area calculation algorithms can be used in this embodiment, and are not limited in this embodiment.

[0063] S203, obtaining the total area and the total projection area of ​​all triangular mesh surfaces, and determining the ratio of the total area of ​​all triangular mesh surfaces to the total projection area as a current roughness evaluation index of the construction joint surface.

[0064] In this embodiment, all triangular mesh surfaces can be summed up to obtain the total area of ​​all triangular mesh surfaces, and all projection areas can be summed up to obtain the total projection area, and then the ratio of the total area of ​​all triangular mesh surfaces to the total projection area, that is, the bonding area ratio, is calculated, which can be used as the current roughness evaluation index of the construction joint surface, wherein the larger the bonding area ratio, the rougher the construction joint surface.

[0065] Optionally, the above-mentioned triangular mesh area and projection area calculation and roughness evaluation index calculation process can be implemented through Python program or other programs, and an efficient point cloud library is used for batch data processing, which has obvious advantages in calculation speed, scalability and practicality.

[0066] S204: Generate an acceptance opinion for the construction joint according to the current roughness evaluation index and preset construction quality requirements.

[0067] In this embodiment, there are usually construction quality requirements for construction joints, especially requirements for roughness. Therefore, it is possible to judge whether the construction joints meet the preset construction quality requirements based on the current roughness evaluation index and the preset construction quality requirements, so as to realize the acceptance of the construction joints and then generate an acceptance opinion for the construction joints, wherein the acceptance opinion may include whether rectification is needed, as well as specific rectification measures, etc.

[0068] The acceptance opinions may be generated in any manner, for example, various corrective measures may be pre-configured for selection, or corrective measures may be given using a pre-trained machine learning model.

[0069] The acceptance method of concrete construction joints provided in this embodiment is to obtain point cloud data of the surface of the construction joint after the concrete construction joint is coated with a retarder and roughened in the final setting stage, and reconstruct the three-dimensional surface morphology model of the construction joint surface according to the point cloud data; triangulate the three-dimensional surface morphology model to obtain multiple triangular mesh surfaces, and obtain the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane; obtain the total area and the total projection area of ​​all triangular mesh surfaces, and determine the ratio of the total area of ​​all triangular mesh surfaces to the total projection area as the current roughness evaluation index of the construction joint surface; generate the acceptance opinion of the construction joint according to the current roughness evaluation index and the preset construction quality requirements. In this embodiment, a quantitative roughness evaluation index is obtained based on the point cloud data of the construction joint surface, and acceptance is performed according to the roughness evaluation index, which can quickly and accurately determine whether the construction joint treatment meets the requirements, and ensure the construction quality of the concrete construction joint and the stability and reliability of the structural performance.

[0070] More specifically, compared with the traditional roughening treatment method and acceptance method, the embodiment of the present application shows significant advantages in the following aspects:

[0071] 1) Improve the treatment effect of the construction joint interface. The roughening method based on retarder pretreatment is adopted to ensure the quality of concrete while achieving deep roughening of the construction joint interface under low water pressure. Compared with the traditional manual and mechanical roughening methods, the process is simple to operate, can ensure a more uniform roughness, and effectively avoid secondary damage to the old concrete, which can effectively improve the bonding strength between the new and old concrete.

[0072] 2) Improve construction efficiency and reduce construction risks. Compared with the high water pressure and small construction fan of the traditional roughening method, this application uses a retarder to delay the hardening time of the surface concrete. It can still achieve effective roughening treatment under lower water pressure and larger fan, significantly improving construction efficiency. At the same time, since only a lower water pressure is required, the danger of high-pressure water gun operation is reduced, reducing safety hazards during construction.

[0073] 3) Realize quantitative detection and control of roughness. The use of high-precision 3D scanning technology, such as the use of a portable intelligent 3D scanner, can obtain high-resolution 3D data of the construction joint surface under complex construction site conditions. Compared with traditional visual inspection or sand filling methods, 3D scanning can capture the microscopic features of the bonding surface more comprehensively and meticulously, reducing the errors caused by human factors. Quantitative calculation of roughness evaluation index calculation can comprehensively and objectively reflect the actual roughness of the construction joint surface, greatly improving the accuracy of detection.

[0074] 4) Improve the controllability of bonding strength. By checking and accepting according to the current roughness evaluation index and the preset construction quality requirements, the surface roughness of the construction joint can be effectively controlled to ensure that the surface of the construction joint can meet the preset construction quality requirements. This technical means provides a scientific basis for on-site construction, reduces the occurrence of weak areas, and ensures the stability and consistency of construction quality.

[0075] In summary, the present application overcomes many limitations of the prior art, and also provides a scientific and systematic technical means for the treatment and acceptance of concrete construction joints, which can significantly improve the control level of the construction joint treatment quality, provide a solid guarantee for the safety and durability of the project, and has extremely high engineering application value.

[0076] In an optional embodiment, the preset construction quality requirements include a target splitting tensile strength, wherein the splitting tensile strength is the maximum tensile stress that concrete resists destruction when subjected to a splitting force perpendicular to the force-bearing surface. Since the bonding strength of the joint surface of the construction joint in the concrete layered and segmented casting scenario is generally only about 50% of the strength of the entire cast concrete, it is a place where the splitting tensile strength of the concrete structure is weak. The higher the roughness of the construction joint, the stronger the bonding strength, thereby improving the splitting tensile strength. Therefore, the splitting tensile strength has a certain correlation with the roughness of the construction joint. In this embodiment, a first mapping relationship between the roughness evaluation index and the splitting tensile strength can be obtained in advance; further, the current splitting tensile strength of the construction joint surface can be determined based on the current roughness evaluation index and the first mapping relationship, and the current splitting tensile strength can be compared with the target splitting tensile strength, and an acceptance opinion for the construction joint can be generated based on the comparison result.

[0077] In another optional embodiment, the preset construction quality requirements include a target roughness evaluation index, which is also the bonding area ratio and is comparable. Therefore, the current roughness evaluation index of the construction joint surface can be directly compared with the target roughness evaluation index, and an acceptance opinion for the construction joint can be generated based on the comparison result.

[0078] In another optional embodiment, the preset construction quality requirements include target values ​​of other roughness parameters, such as the target average sand filling depth measured by the sand filling method, or the target values ​​of roughness parameters (such as Rz, Ra, Rq, Rt, etc.) measured by a roughness instrument, and the target values ​​of other roughness parameters are not directly comparable to the roughness evaluation index (bonding area ratio), but have a certain mapping relationship; therefore, in this embodiment, a second mapping relationship between the preset roughness evaluation index and the other roughness parameters can be obtained in advance; further, according to the second mapping relationship, the current roughness evaluation index can be mapped to other roughness parameters, and compared with the target values ​​of other roughness parameters, and the acceptance opinion of the construction joint can be generated according to the comparison result.

[0079] In any of the above embodiments, when generating the acceptance opinion of the construction joint according to the comparison result, it may specifically include:

[0080] If the preset construction quality requirements are met, the construction joint is determined to have passed the acceptance inspection, and the acceptance opinion may be that no rectification is required;

[0081] If the preset construction quality requirements are not met, the current gap between the construction joint and the preset construction quality requirements is determined, and the target rectification measures for the construction joint are determined based on the current gap and a third mapping relationship between different preset gap ranges and different rectification measures, and an acceptance opinion is generated based on the target rectification measures.

[0082] In this embodiment, a third mapping relationship between different preset gap ranges and different corrective measures can be pre-configured, and then the target corrective measures for the construction joint can be determined based on the third mapping relationship according to the current gap between the construction joint and the preset construction quality requirements, and the acceptance opinion can be generated according to the target corrective measures.

[0083] Among them, the current gap between the construction joint and the preset construction quality requirements can be determined according to the different preset construction quality requirements in the above embodiments. For example, if the preset construction quality requirements include the target roughness evaluation index, the current gap between the construction joint and the preset construction quality requirements is the difference between the current roughness evaluation index and the target roughness evaluation index, or it can also be the ratio between the difference and the target roughness evaluation index; if the preset construction quality requirements include the target average sand filling depth, the current gap between the construction joint and the preset construction quality requirements is the difference between the mapped current average sand filling depth and the target average sand filling depth, or it can also be the ratio between the difference and the target average sand filling depth; if the preset construction quality requirements include the target splitting tensile strength, the current gap between the construction joint and the preset construction quality requirements is the difference between the mapped current splitting tensile strength and the target splitting tensile strength, or it can also be the ratio between the difference and the target splitting tensile strength.

[0084] Optionally, the target rectification measures for the construction joint are determined based on a third mapping relationship between different pre-configured preset gap ranges and different rectification measures, which may be specifically as follows:

[0085] If the current gap is within the first preset gap range, the target corrective measure is to shorten the roughening distance, trim the surface of the construction joint, and wash away the cementitious material and part of the fine aggregate to expose part of the coarse aggregate; or

[0086] If the current gap is within the second preset gap range, the target corrective measure is to increase the punching pressure and re-brush the relatively flat part of the construction joint surface; or

[0087] If the current gap is within the third preset gap range, the target corrective measure is to re-apply the retarder on the surface of the construction joint, and adjust at least one of the flushing pressure, distance and nozzle model, and re-brush the construction joint;

[0088] The first preset gap range, the second preset gap range, and the third preset gap range increase sequentially. For example, if the preset construction quality requirements include the target roughness evaluation index, the current gap between the construction joint and the preset construction quality requirements is the ratio of the difference between the current roughness evaluation index and the target roughness evaluation index to the target roughness evaluation index. The first preset gap range can be 0~5%, the second preset gap range can be 5%~15%, and the third preset gap range can be above 15%.

[0089] On the basis of the above embodiment, the following experimental example is used for verification, and the second mapping relationship between the roughness evaluation index and the average depth of sand filling, and the first mapping relationship between the roughness evaluation index and the splitting tensile strength are determined. The specific process is as follows:

[0090] 1. Equipment and tools:

[0091] Roughening equipment: high-pressure water gun, used to remove the slurry on the concrete surface to form a roughened surface.

[0092] Scanning equipment: portable intelligent 3D scanner and supporting 3D data visualization software.

[0093] Python program: Self-written Python program for importing point cloud data, selecting calculation areas, and calculating roughness evaluation indicators.

[0094] Other equipment: Sand filling measuring equipment (for traditional measurement of roughness), split tensile testing machine (for bonding performance testing).

[0095] 2. Experimental steps:

[0096] Step 1: Test Block Preparation

[0097] Four groups of concrete test blocks were made and subjected to treatments including no roughening, artificial roughening, direct roughening, and roughening after surface coating of retarder.

[0098] Step 2: 3D Scanning

[0099] Use a 3D scanner to scan the surface of each test block. Make sure to cover the entire surface when scanning to ensure that nothing is missed. Import the scanned data into the 3D data visualization software to pre-process the point cloud data, including denoising, filtering and data splicing, to generate a complete 3D surface morphology model, such as Figure 3 As shown, save it as a PLY format file.

[0100] Step 3: Extract roughness characteristic parameters

[0101] Import the PLY format file into the Python program, select the calculation area, and calculate the roughness evaluation index of the test block surface. In this embodiment, the bonding area ratio of the actual bonding area and the projected area of ​​the construction joint is selected as the roughness evaluation index for roughness characterization, and a second mapping relationship between the roughness evaluation index (bonding area ratio) and the average depth of sand filling is constructed, such as Figure 4 As shown in the figure, the bonding area ratio shows a significant positive correlation with the average depth of sand filling measured by the traditional sand filling method, indicating that it is effective to use the bonding area ratio to characterize the roughness of the construction joint surface.

[0102] Step 4: Bonding strength test of the joint surface

[0103] New concrete was poured on the surface of the test block to form a construction joint interface. After the 28-day curing period, a splitting tensile strength test was performed using a splitting tensile testing machine to obtain the splitting tensile strength f of the test block. tb .

[0104] Step 5: Construct a correlation model between roughness evaluation index and bonding performance

[0105] The roughness evaluation index of each test block is fitted and analyzed with the corresponding splitting tensile strength data, and the first mapping relationship between the roughness evaluation index (bonding area ratio) and the splitting tensile strength is constructed, such as Figure 5 As shown in the figure, the effect of the retarder + roughening treatment of test block D is significantly better than that of the roughening treatment of test block C alone, which verifies the effectiveness of the construction joint treatment method proposed in this application.

[0106] Step 6: Acceptance Process

[0107] In actual projects, after the construction joint interface is roughened, the roughness evaluation index is obtained through the above-mentioned roughness evaluation method, and then the first mapping relationship between the roughness evaluation index (bonding area ratio) and the splitting tensile strength is used to predict the splitting tensile strength, that is, the predicted bonding strength, and compared with the target splitting tensile strength included in the preset construction quality requirements. For example, if the splitting tensile strength of the new and old concrete interface is required to be greater than 1.6MPa, the bonding area ratio of the treated construction joint interface should be greater than 1.35 to ensure that the construction meets the design specifications.

[0108] On the basis of any of the above embodiments, before construction, the required roughness evaluation index can be determined in advance according to the preset construction quality requirements, and a specific construction plan can be given according to the roughness evaluation index, including the type of retarder, the amount of retarder, the specific water pressure and fan parameters of the roughening, etc.; of course, the specific construction plan is a process affected by the coupling of multiple parameters such as concrete strength, retarder concentration and unit area dosage, ambient temperature, interval time, construction machinery, etc. A change in one parameter may cause corresponding adjustments to other parameters. Therefore, a certain parameter can be fixed in advance, and the effect changes caused by other parameters can be analyzed to obtain a single optimal parameter, and then the best combination of parameters can be summarized in continuous engineering practice.

[0109] Figure 6 The structure diagram of the concrete construction joint acceptance device provided in the embodiment of the present application. The concrete construction joint acceptance device provided in the embodiment can execute the processing flow provided in the concrete construction joint acceptance method embodiment, such as Figure 6 As shown, the concrete construction joint acceptance device 600 includes: an acquisition module 601, a point cloud processing module 602, a roughness evaluation module 603, and an acceptance module 604.

[0110] An acquisition module 601 is used to acquire point cloud data of the surface of the concrete construction joint after the concrete construction joint is coated with a retarder and roughened in the final setting stage;

[0111] The point cloud processing module 602 is used to reconstruct the three-dimensional surface morphology model of the construction joint surface according to the point cloud data; triangulate the three-dimensional surface morphology model to obtain a plurality of triangular mesh surfaces, and obtain the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane;

[0112] The roughness evaluation module 603 is used to obtain the total area and the total projection area of ​​all triangular mesh surfaces, and determine the ratio of the total area to the total projection area of ​​all triangular mesh surfaces as the current roughness evaluation index of the construction joint surface;

[0113] The acceptance module 604 is used to generate an acceptance opinion of the construction joint according to the current roughness evaluation index and the preset construction quality requirements.

[0114] In one or more embodiments of the present application, the preset construction quality requirement includes a target roughness evaluation index; accordingly, when the acceptance module 604 generates the acceptance opinion of the construction joint according to the current roughness evaluation index and the preset construction quality requirement, it is used to:

[0115] The current roughness evaluation index of the construction joint surface is compared with the target roughness evaluation index, and an acceptance opinion of the construction joint is generated according to the comparison result.

[0116] In one or more embodiments of the present application, the preset construction quality requirement includes a target average depth of sand filling; accordingly, when the acceptance module 604 generates the acceptance opinion of the construction joint according to the current roughness evaluation index and the preset construction quality requirement, it is used to:

[0117] Obtaining a second mapping relationship between a preset roughness evaluation index and an average sand filling depth;

[0118] According to the current roughness evaluation index and the second mapping relationship, the current average sand filling depth of the construction joint surface is determined, and the current average sand filling depth is compared with the target average sand filling depth, and the acceptance opinion of the construction joint is generated according to the comparison result.

[0119] In one or more embodiments of the present application, the preset construction quality requirement includes a target splitting tensile strength; accordingly, when the acceptance module 604 generates the acceptance opinion of the construction joint according to the current roughness evaluation index and the preset construction quality requirement, it is used to:

[0120] Obtaining a first mapping relationship between a preset roughness evaluation index and a splitting tensile strength;

[0121] According to the current roughness evaluation index and the first mapping relationship, the current splitting tensile strength of the construction joint surface is determined, and the current splitting tensile strength is compared with the target splitting tensile strength, and an acceptance opinion of the construction joint is generated according to the comparison result.

[0122] In one or more embodiments of the present application, when generating the acceptance opinion of the construction joint according to the comparison result, the acceptance module 604 is used to:

[0123] If the preset construction quality requirements are met, it is determined that the construction joint has passed the acceptance inspection;

[0124] If the preset construction quality requirements are not met, the current gap between the construction joint and the preset construction quality requirements is determined, and the target rectification measures for the construction joint are determined based on the current gap and a third mapping relationship between different preset gap ranges and different rectification measures, and an acceptance opinion is generated based on the target rectification measures.

[0125] In one or more embodiments of the present application, when determining the target rectification measure for the construction joint according to the current gap and the third mapping relationship between different preset gap ranges and different rectification measures, the acceptance module 604 is used to:

[0126] If the current gap is within the first preset gap range, the target corrective measure is determined to be shortening the roughening distance, trimming the surface of the construction joint, and flushing away the cementitious material and part of the fine aggregate to expose part of the coarse aggregate; or

[0127] If the current gap is within the second preset gap range, the target corrective measure is determined to be to increase the roughening pressure and re-roughen the relatively flat portion of the construction joint surface; or

[0128] If the current gap is within the third preset gap range, the target corrective measure is determined to be re-coating the retarder on the surface of the construction joint, and adjusting at least one of the flushing pressure, distance and nozzle model, and re-brushing;

[0129] The first preset gap range, the second preset gap range, and the third preset gap range increase in sequence.

[0130] In one or more embodiments of the present application, when acquiring the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane, the point cloud processing module 602 is used to:

[0131] For any of the triangular mesh surfaces or the projection of any of the triangular mesh surfaces on the concrete construction joint plane, determine its vertex coordinates, determine any two edge vectors based on the vertex coordinates, and obtain half of the modulus of the cross product of the any two edge vectors as the corresponding area.

[0132] In one or more embodiments of the present application, when the acquisition module 601 acquires point cloud data of the surface of the construction joint after the concrete construction joint is coated with a retarder and roughened in the final setting stage, it is used to:

[0133] After the construction joint is coated with a predetermined retarder and roughened with a high-pressure water gun in the final setting stage, point cloud data of the construction joint surface is obtained; the predetermined retarder is a composite retarder of sodium tripolyphosphate and modified phosphonate.

[0134] The acceptance device for concrete construction joints of the embodiment of the present application can be used to implement the technical solution of the above-mentioned method embodiment. Its implementation principle and technical effect are similar and will not be repeated here.

[0135] Figure 7 FIG. 1 shows a hardware structure diagram of an electronic device provided in an embodiment of the present application. Figure 7 As shown, the electronic device 700 is used to implement the operations corresponding to the electronic device in any of the above method embodiments. The electronic device 700 of this embodiment may include: a memory 701, a processor 702 and a communication interface 703.

[0136] The memory 701 is used to store computer programs. The memory 701 may include a high-speed random access memory (RAM), and may also include a non-volatile memory (NVM), such as at least one disk memory, and may also be a USB flash drive, a mobile hard disk, a read-only memory, a disk, or an optical disk.

[0137] The processor 702 is used to execute the computer program stored in the memory to implement the method in the above embodiment. For details, please refer to the relevant description in the above method embodiment. The processor 702 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the invention can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor.

[0138] Optionally, the memory 701 can be independent or integrated with the processor 702. When the memory 701 is a device independent of the processor 702, the electronic device 700 may further include a bus. The bus is used to connect the memory 701 and the processor 702. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application is not limited to only one bus or one type of bus.

[0139] The communication interface 703 is used to receive or send various data or instructions in this application.

[0140] The electronic device provided in this embodiment can be used to execute the method in the above embodiments. Its implementation method and technical effect are similar, and this embodiment will not be described in detail here.

[0141] In addition, this embodiment further provides a computer-readable storage medium on which computer execution instructions are stored. The computer execution instructions are executed by a processor to implement the method described in the above embodiment.

[0142] In addition, this embodiment further provides a computer program product, including a computer program, and the computer program is executed by a processor to implement the method described in the above embodiment.

[0143] In the several embodiments provided in the embodiments of the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0144] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0145] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

[0146] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0147] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. The specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0148] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application are described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0149] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0150] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for acceptance of concrete construction joints, characterized in that: include: After the concrete construction joint is coated with a retarder and roughened in the final setting stage, point cloud data of the construction joint surface is obtained, and a three-dimensional surface morphology model of the construction joint surface is reconstructed according to the point cloud data; Performing triangulation on the three-dimensional surface topography model to obtain a plurality of triangular mesh surfaces, and obtaining the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane; Obtaining the total area and total projection area of ​​all triangular mesh surfaces, and determining the ratio of the total area to the total projection area of ​​all triangular mesh surfaces as a current roughness evaluation index of the construction joint surface; An acceptance opinion of the construction joint is generated according to the current roughness evaluation index and the preset construction quality requirements.

2. The method according to claim 1, characterized in that The preset construction quality requirement includes a target roughness evaluation index; accordingly, generating the acceptance opinion of the construction joint according to the current roughness evaluation index and the preset construction quality requirement includes: The current roughness evaluation index of the construction joint surface is compared with the target roughness evaluation index, and an acceptance opinion of the construction joint is generated according to the comparison result.

3. The method according to claim 1, characterized in that The preset construction quality requirements include a target splitting tensile strength; accordingly, the acceptance opinion of the construction joint is generated according to the current roughness evaluation index and the preset construction quality requirements, including: Obtaining a first mapping relationship between a preset roughness evaluation index and a splitting tensile strength; According to the current roughness evaluation index and the first mapping relationship, the current splitting tensile strength of the construction joint surface is determined, and the current splitting tensile strength is compared with the target splitting tensile strength, and an acceptance opinion of the construction joint is generated according to the comparison result.

4. The method according to claim 2 or 3, characterized in that: Generating the acceptance opinion of the construction joint according to the comparison result includes: If the preset construction quality requirements are met, it is determined that the construction joint has passed the acceptance inspection; If the preset construction quality requirements are not met, the current gap between the construction joint and the preset construction quality requirements is determined, and the target rectification measures for the construction joint are determined based on the current gap and a third mapping relationship between different preset gap ranges and different rectification measures, and an acceptance opinion is generated based on the target rectification measures.

5. The method according to claim 4, characterized in that Determining the target rectification measures for the construction joint according to the current gap and the third mapping relationship between different preset gap ranges and different rectification measures includes: If the current gap is within the first preset gap range, the target corrective measure is determined to be shortening the roughening distance, trimming the surface of the construction joint, and flushing away the cementitious material and part of the fine aggregate to expose part of the coarse aggregate; or If the current gap is within the second preset gap range, the target corrective measure is determined to be to increase the roughening pressure and re-roughen the relatively flat portion of the construction joint surface; or If the current gap is within the third preset gap range, the target corrective measure is determined to be re-coating the retarder on the surface of the construction joint, and adjusting at least one of the flushing pressure, distance and nozzle model, and re-brushing; The first preset gap range, the second preset gap range, and the third preset gap range increase in sequence.

6. The method according to claim 1, characterized in that The step of obtaining the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane includes: For any of the triangular mesh surfaces or the projection of any of the triangular mesh surfaces on the concrete construction joint plane, determine its vertex coordinates, determine any two edge vectors based on the vertex coordinates, and obtain half of the modulus of the cross product of the any two edge vectors as the corresponding area.

7. The method according to claim 1, characterized in that The method of obtaining point cloud data of the surface of the concrete construction joint after the concrete construction joint is coated with a retarder and roughened in the final setting stage includes: After the construction joint is coated with a predetermined retarder and roughened with a high-pressure water gun in the final setting stage, point cloud data of the construction joint surface is obtained; the predetermined retarder is a composite retarder of sodium tripolyphosphate and modified phosphonate.

8. An acceptance device for concrete construction joints, comprising: An acquisition module is used to acquire point cloud data of the surface of the concrete construction joint after the concrete construction joint is coated with a retarder and roughened in the final setting stage; A point cloud processing module is used to reconstruct a three-dimensional surface morphology model of the construction joint surface according to the point cloud data; triangulate the three-dimensional surface morphology model to obtain a plurality of triangular mesh surfaces, and obtain the area of ​​each triangular mesh surface and the projection area of ​​each triangular mesh surface on the concrete construction joint plane; A roughness evaluation module is used to obtain the total area and total projection area of ​​all triangular mesh surfaces, and determine the ratio of the total area of ​​all triangular mesh surfaces to the total projection area as a current roughness evaluation index of the construction joint surface; The acceptance module is used to generate an acceptance opinion of the construction joint according to the current roughness evaluation index and the preset construction quality requirements.

9. An electronic device, comprising: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

11. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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