In what scenarios is the concrete laser leveling used?

Concrete construction is generally leveled manually, and the appearance of laser leveling machines completely liberates the inconvenience of manual operation. It greatly reduces the labor cost for the construction site, and has a significant improvement in the leveling effect of the concrete. Therefore, mechanized operations in this era can have a great impact on the construction industry. Concrete laser leveling is a scientific and reasonable design, and there is no need for manual assistance in the operation of the equipment, which is the convenience, science, technology, etc. in the design process. Of course, the laser leveling equipment used in different construction fields is different. Because the concrete laser leveling equipment has a variety of models and sizes in the production process, it has a wide range of uses. All of these need to improve the advantages and technical characteristics in this aspect during the leveling process, so as to be able to occupy an advantage in the industry and improve the brand characteristics. As in concrete laser leveling, it must be seen through the concrete construction process. This is the key to technological progress. It has full advantages and status in the field of various leveling and leveling equipment, and has been recognized and trusted by more builders, so it has been widely promoted in construction sites across the country. Issues that should be noted: (1) Due to the high construction efficiency, the later cutting must keep up. Generally, each laser leveling machine is equipped with 7-8 cutting machines to meet the requirements. (2) In the early stage, plastic film should be used for maintenance, and non-woven fabric should be covered after cutting. (3) During the construction process, due to the lateral pressure of the concrete, the steel mesh is easy to displace horizontally. For this reason, an isolation bench is placed directly on the adjacent steel mesh, so that the horizontal displacement of the steel mesh can be effectively controlled, and the bench can be used repeatedly. Advanced equipment such as laser leveling machines are especially suitable for projects such as docks, storage yards, expressways, airports, large squares, parking lots, and municipal roads that have relatively simple shapes, large amounts of action, and high construction quality requirements.       DETAIL   IMAGES      

    Wear: Regularly check the surface wear of the drive belt. If the belt surface has obvious cracks, peeling, or is worn to less than two-thirds of its original thickness, it is necessary to consider replacing it. For example, a new drive belt is 10 mm thick. When it is worn to less than 6-7 mm, its strength and transmission efficiency will drop significantly, and it is easy to slip. Observe whether there is wear or tear on the edges of both sides of the belt. Edge wear may be caused by misalignment of the pulley or excessive belt tension. Once the edge is damaged, the belt may be out of the groove during operation, resulting in interruption of power transmission. Elasticity and tension changes: Press the belt by hand to check its elasticity. If the belt loses its elasticity and becomes stiff, it may be because the belt is aging or has been under high load for a long time. In this case, the belt cannot effectively buffer and transmit power during transmission, which may easily lead to unstable power transmission. It is also important to check the tension of the belt. Appropriate tension can ensure good contact and power transmission between the belt and the pulley. If the belt is too loose, there will be obvious slippage. By observing the rotation of the pulley and the movement of the belt, it can be found that when the pulley rotates, the belt may slip on the pulley instead of rotating synchronously. If the belt is too tight, it will increase the wear of the belt and pulley, and will bring additional loads to components such as the motor and bearings. A belt tension meter can be used to accurately measure the belt tension. When the tension exceeds the specified range, the belt needs to be adjusted or replaced. Abnormal noise and vibration: When there is a problem with the drive belt, abnormal noise such as "chirp" or "snap" will be generated during the operation of the trowel. This noise is usually caused by abnormal friction between the belt and the pulley, which may be caused by belt wear, looseness, or impurities such as oil stains. At the same time, it will be accompanied by vibration, which can be felt by touching the body of the trowel or the bracket near the drive component. If the abnormal noise and vibration persist and are related to the belt after excluding other component failures, then the belt needs to be replaced.     Wear and elongation: Check the wear of the chain links. If the rollers, sleeves and pins of the chain links are worn out, the pitch of the chain will increase, causing the chain to elongate. Generally speaking, when the chain elongates by more than 3% 5% of the original length, the accuracy and stability of power transmission will be affected. For example, a chain with an original length of 1 meter is prone to tooth skipping when it is elongated by more than 30 50 mm. Observe the side wear of the chain. If the side of the chain is severely worn during the meshing process with the sprocket, it will cause poor meshing between the chain and the sprocket, increasing the risk of the chain coming off the chain. This can be judged by observing whether there are shiny wear marks on the side of the chain. These shiny areas indicate that the friction between the chain and the sprocket at this part is abnormal. Sprocket wear: The sprocket of the transmission chain also needs to be checked. If the tooth profile of the sprocket is worn, the top of the tooth becomes sharp or the tooth groove becomes wide, it will affect the meshing effect of the chain and the sprocket. When the tooth wear exceeds a certain limit (such as tooth thickness wear exceeding 10% 15%), it is necessary to replace the chain and sprocket at the same time, because the old chain and the worn sprocket cannot guarantee good power transmission and will accelerate the wear of the new chain. Lubrication and operating status: Good lubrication is the key to the normal operation of the chain. If the chain becomes dry and stuck during operation, it may be due to insufficient lubrication or lubricant failure. At this time, check the chain's lubrication system and add or replace the appropriate lubricant. If the chain still does not run smoothly under normal lubrication, such as jamming, tooth skipping or abnormal noise (such as "clicking"), it may be that the chain or sprocket is severely worn and needs to be considered for replacement.

    The detection methods and acceptance standards for the flatness and smoothness of the floor after the construction by the concrete laser leveling machine are a very professional and important issue. Although laser levelings can achieve extremely high quality standards, the final acceptance relies on objective data. The following are the detailed testing methods and acceptance criteria: Flatness is the greatest advantage of the laser leveling machine, and its acceptance criteria are much higher than those of traditional processes. Straightedge and feeler gauge method (traditional, commonly used) Tools: 2-meter or 3-meter national standard straightedge (or electronic straightedge), feeler gauge. Method: Place the straightedge steadily on the ground and use a feeler gauge to measure the maximum gap between the bottom of the straightedge and the ground. At least 10 points should be measured in the same area (such as a slab or a room), and the measurement points should be randomly distributed and cover key parts such as the edges of walls and the bases of columns. Advantages: Simple tools, convenient operation and intuitive. Disadvantage: It reflects local "wavy" undulations and cannot accurately measure the overall flatness of a large area. Level or total station measurement method (elevation method) Tools: High-precision level, tower ruler or total station. Method: Set up measurement points on the ground in a certain grid (for example, 1m×1m or 2m×2m), measure the elevation value of each point with a level, and then calculate the height difference between any two points or the standard deviation of the entire area. Advantages: The data is precise and can generate an elevation map of the entire ground, making it the most scientific. Disadvantages: It takes a long time and requires high technical skills from the operators. F-Number System (Internationally recognized and the most scientific method) This is the method stipulated in the ASTM E1155 standard of the United States. It is currently the mainstream and highest standard for evaluating the flatness of the floor internationally, and is particularly suitable for high-standard floors constructed by laser levelings. Tools: Specialized floor profile meters (such as DipStick, DynaPulse, etc.) or continuous inertial profile measurement vehicles. Evaluation index F_F value (flatness value) : It measures the undulation of the large wavelength (>600mm) of the floor, reflecting the degree of "tilt" or "wave" of the floor. The larger the F_F value, the flatter the overall floor. F_L value (levelness value) : It measures the undulation of the small wavelength (<600mm) of the floor surface, reflecting the degree of "roughness" or "micro-vibration" of the floor surface. The larger the F_L value is, the smoother the local area of the floor will be. Method: Measurement and calculation are carried out by professionals and equipment in accordance with standard procedures. Domestic traditional standard (ruler method Ordinary industrial floor: Within a 2-meter straightedge range, the flatness deviation is ≤ 4mm. High-standard industrial floor /VNA ultra-flat floor: Within a 2-meter straightedge range, the flatness deviation is ≤ 2mm. For VNA flooring, it is usually required to be ≤ 1.5mm / 2m. International F-Number Standard (Recommended for high-standard projects) Ordinary industrial floor: F_F 20 / F_L 15 High-standard warehouse/logistics center: F_F 35 / F_L 25 VNA narrow channel library/super flat floor: F < sub > F < / sub > 50 / F < sub > L < / sub > 40 or higher (F < sub > F < / sub > 60 / F < sub > L < / sub > 50) Commercial floor (such as supermarkets) : F_F 25 / F_L 20 Note: The specific F value should be clearly stipulated in the project contract or design documents. Smoothness is a comprehensive concept, encompassing appearance, wear resistance, dust resistance, etc., and it is more dependent on visual inspection and functional acceptance. Visual inspection method Method: Observe the floor surface from different angles under well-lit conditions. Inspection contents Color uniformity: Whether the surface color is consistent, and whether there are obvious color differences, water marks, excessive or insufficient cement slurry. Defects: Whether there are honeycombs, pitted surfaces, holes, peeling, sanding, or exposed stones. Cracks: Check for visible plastic shrinkage cracks and dry shrinkage cracks to the naked eye. Focus on inspecting corners and areas with stress concentration. Bubbles: The quantity and size of surface bubbles. Generally, it is required that there should not be too many bubbles with a diameter greater than 2mm. Mark and gloss: Whether the surface is smooth and if there are any obvious machine marks or manual marks. Hard object scratching method Tools: Keys, coins and other hard objects. Method: Use a hard object to scratch the surface with a certain force. Judgment: If only light white scratches are left, it indicates that the surface hardness is good. If there is obvious sand grain shedding or deep grooves, it indicates that the surface strength is insufficient and sanding may occur. Rebound instrument method Tool: Concrete rebound tester. Method: Indirectly calculate the strength of the floor surface through the rebound value. This method has certain errors and needs to be corrected in accordance with the standards. Judgment: The rebound value should meet the design strength requirements. Abrasion resistance test (Laboratory) For places with high wear resistance requirements, cores can be taken on-site and sent to the laboratory for "abrasion tests" (such as ASTM C779). Visual quality Color: The surface color is uniform and consistent, without obvious color differences or contamination. Defects: The surface is dense and smooth, free from quality defects such as honeycombing, pitting, cracks, sanding, peeling, and hollowing. Seam: The cutting seam should be straight, with uniform width and depth, and no missing edges or corners. Surface hardness and anti-dusting property Scratching with a hard object should not produce sanding or loose substances. In daily use, the movement of vehicles and the movement of people should not cause dust to rise on the ground. In addition to flatness and smoothness, the following indicators also need to be paid attention to Elevation and slope Tools: Level, total station. Standard: The allowable deviation between the measured elevation and the designed elevation is usually ±10mm. In areas with drainage requirements, the slope should comply with the design requirements and there should be no water accumulation. Levelness (not flatness) Tools: Laser leveler, level. Standard: It refers to the degree of inclination of the entire floor relative to the absolute horizontal plane. For equipment foundations with strict level requirements, the allowable error is very small (such as ±3mm/10m). Inspection items Main detection tools Reference for High-standard acceptance Flatness 2-meter straightedge, feeler gauge ≤ 2mm / 2m (Recommended ≤ 1.5mm / 2m) F-Number measurement system F_F 50 / F_L 40 (Applicable to VNA floor) Smoothness Visual inspection, hard object scratches The color is uniform, without cracks, sanding or holes, and there is no sanding when scratched Elevation Level, total station ±10mm Slope Level, total station It meets the design requirements and there is no water accumulation Important Notice Prior agreement: All acceptance criteria (especially the methods and standards for flatness) must be clearly stipulated in the contract before construction to avoid disputes later on. Comprehensive inspection: During the acceptance process, a combination of a thorough census and key spot checks should be conducted; it is not advisable to merely focus on a few points. Environmental conditions: The inspection should be carried out after the concrete has reached a certain strength and the surface should be cleaned thoroughly. For high-standard floors constructed by laser leveling machines, it is strongly recommended to introduce the F-Number system for acceptance, as it can most scientifically and comprehensively evaluate the quality and performance of the floor, especially suitable for projects with extreme requirements for the ground such as automated warehouses and logistics centers.   Note: The parameters provided in this document are for reference only and are not mandatory. Due to differences in technical characteristics between different brands and models of laser levelers, please consult the manufacturer for a suitable solution before actual operation. This reference document assumes no responsibility for any issues arising from failure to follow the manufacturer's instructions.