1. Experimental research method
- Flatness test experiment
- Using level and tower ruler: On the ground after the concrete laser leveling machine is constructed, set measurement points at a certain interval (such as every 1 meter or 2 meters). Use the level and tower ruler to measure the elevation of each point, and then calculate the flatness indicators of the ground, such as maximum deviation, mean square error, etc. This method can intuitively evaluate the control ability of the leveling machine on the flatness of the ground. For example, in a factory floor construction project, the ground after the laser leveling machine is measured. If the maximum deviation is within the allowable range (such as within 3-5mm of the industrial floor flatness requirement), it means that its flatness performance is good.
- Laser scanner: The laser scanner can quickly obtain three-dimensional data of a large area of ground. Place the laser scanner in a suitable position, scan the ground after construction, and obtain the point cloud data of the ground. By processing these data with professional software, a three-dimensional model of the ground can be generated, and parameters such as the flatness and slope of the ground can be accurately calculated. Compared with levels and tower rulers, laser scanners are more efficient and can obtain more comprehensive data.
- Strength test experiment
- Concrete test block production and compression test: During the construction of the laser leveling machine, concrete test blocks are produced at the same time. The production conditions of these test blocks (such as concrete mix ratio, vibration method, etc.) should be consistent with the construction site. After the test blocks reach the specified curing period, the test blocks are tested for compressive strength using a pressure testing machine. By comparing the compressive strength of the test blocks with the design strength requirements, it is evaluated whether the construction process of the laser leveling machine has an impact on the strength of the concrete. For example, if the design requires the compressive strength of the concrete to be C30, after testing, the average compressive strength of the test blocks reaches or exceeds 30MPa, and the discreteness is small, indicating that the construction of the leveling machine has little effect on the strength and the performance is reliable.
- Rebound Hammer Test: On the concrete surface after construction, a rebound test is performed using a rebound hammer. The rebound hammer infers the strength of the concrete by hitting the concrete surface and based on the rebound value. This method is easy to operate, and can be used to perform multi-point tests on a large area of concrete surface to quickly evaluate the strength uniformity of the concrete. However, the results of the rebound test are affected by factors such as the surface quality of the concrete and the depth of carbonization, and need to be comprehensively judged in combination with methods such as the test block compression test.
- Efficiency test experiment
- Construction time record: In concrete construction projects of different scales (such as different areas and thicknesses), record the time it takes for the laser leveler to start construction and complete the leveling task. At the same time, record the pause time during the construction process (such as equipment failure maintenance, material supply interruption, etc.), and evaluate its construction efficiency by calculating the amount of work completed per unit time (such as square meters/hour). For example, in a 1,000 square meter ground construction, if the laser leveler completes the construction in 8 hours without any fault, its construction efficiency is 125 square meters/hour.
- Comparative test: Compare the concrete laser leveler with the traditional leveling method (such as manual vibration, small mechanical vibration, etc.) under the same construction conditions (such as the same amount of concrete, the same site environment, etc.). Record the respective construction time, manpower input, energy consumption and other data, and highlight the efficiency advantage of the laser leveler through comparative analysis.
2. Data analysis tools
- Statistical analysis software (such as SPSS, Excel advanced functions)
- Data collation and descriptive statistics: Input the data obtained from the experimental test (such as flatness measurement value, strength test value, construction time, etc.) into the statistical analysis software. Use the data collation function of the software to clean and preprocess the data to remove outliers, etc. Then perform descriptive statistical analysis to calculate statistical indicators such as mean, standard deviation, maximum value, minimum value, etc. to understand the central trend and dispersion of the data. For example, through the Excel data analysis plug-in, calculate the mean and standard deviation of the flatness measurement data to intuitively display the overall situation and fluctuation range of the ground flatness.
- Correlation analysis: When studying the relationship between different performance indicators of the laser leveling machine, such as between construction efficiency and flatness, between construction time and strength, etc., statistical analysis software can be used for correlation analysis. By calculating the correlation coefficient, it is determined whether the two indicators are positively correlated, negatively correlated, or unrelated. For example, if a negative correlation is found between construction time and flatness, that is, the shorter the construction time, the worse the flatness, the further analysis of the cause is needed. It may be that the construction speed is too fast and affects the leveling effect.
- Professional engineering software (such as AutoCAD Civil 3D, Midas Gen)
- 3D modeling and visualization analysis: Use software such as AutoCAD Civil 3D to import the ground 3D point cloud data obtained by the laser scanner to generate a high-precision ground 3D model. Through this model, you can intuitively view the flatness and slope of the ground, and perform virtual roaming and spatial analysis. For example, in concrete construction on complex terrain, the 3D model can accurately evaluate whether the laser leveling machine has completed the slope shaping of the ground according to the design requirements.
- Structural analysis (for concrete structure performance): For situations involving concrete structure performance evaluation, such as the bearing capacity of large concrete slabs, use structural analysis software such as Midas Gen. Input the concrete structure parameters (such as thickness, strength, etc.) after the laser leveling machine is constructed into the software, and combined with the actual load conditions, structural mechanics analysis is performed to evaluate the safety and reliability of the structure. This kind of analysis is very important for some concrete projects with high requirements on bearing capacity (such as parking lots, industrial plant floors, etc.).