Small mistakes, big risks! A collection of common mistakes made by laser leveler maintenance novices

WS740 concrete laser leveling machine: the apparatus guide by laser for concrete leveling. Laser leveling leveling machine could greatly improve the concrete smoothness and compaction. as well as prolong the service life of concrete floor. Walk-behind two wheels concrete laser leveling machine, mainly used in large area concrete construction, such as workshop, supermarket, warehouse, airport, playground and so on. This laser leveling can satisfy the construction requirement of large area and high flatness and levelness. As for laser leveling: A new concrete construction,while construct a large area of concrete floor,use laser leveling machine to vibrate new concrete,leveling and control the standard elevation from ground. Technical Description:First,set a fixed laser transmitter,the transmitter emits a laser beam rotation forming a laser control plane,using handheld receivers lever floor elevation guide to the leveling head of Tank concrete laser leveling machine,the automatic control system of leveling machine receiver laser signal (10 times/sec frequency) based on the laser leveling head sensed,then adjust the elevation automatic in real-time,because the laser emitter after the set is fixed,so it can make sure does not produce a cumulative error while a large area of ground construction.  

△ Applicable stage: Before initial setting after concrete pouring (about 1-2 hours after pouring, the specific time depends on the concrete ratio and ambient temperature). △ Operation points: The laser leveler sets the reference plane through the laser transmitter, automatically levels and vibrates the concrete, and quickly completes the rough leveling of a large area. Focus on the corners, column roots and other areas that are difficult for the laser leveler to cover, and manually assist in scraping. △ Applicable stage: after the initial setting of concrete (when there is a slight indentation when pressing with fingers but it is not sticky). Operation steps: △ Disc trowel: First use a disc trowel to perform preliminary slurry lifting and compaction to eliminate surface bumps. △ Blade trowel: After the concrete strength is further improved, use a blade trowel for fine finishing to form a smooth surface. △ Note: The trowel needs to be divided into 2-3 Operate over and adjust the blade angle (from low to high) each time to gradually increase the surface density.   △ The laser leveling machine needs to complete the rough leveling before the initial setting of the concrete to avoid the difficulty of vibrating the concrete after hardening. △ The trowel machine needs to start working after the initial setting of the concrete. Too early will cause sand on the surface, and too late will make it difficult to compact. △ The laser leveling machine is responsible for efficient leveling of large areas, and the trowel machine is responsible for local finishing and surface treatment. △ For the corners that the laser leveling machine cannot reach, it is necessary to manually use a scraper to initially level it, and then the trowel machine will handle it. △ The leveling accuracy of the laser leveling machine must meet the design requirements (such as ±3mm/3m), providing a good foundation for the trowel. △ The angle and speed of the trowel blade need to be adjusted according to the strength of the concrete to avoid over-grinding or under-grinding.   Cover and maintain in time after the operation is completed to prevent surface cracking. The operation interval should be shortened in hot and dry weather to avoid excessive water loss of concrete. The laser leveling machine needs to calibrate the laser transmitter regularly, and the trowel blade needs to clean the concrete residue in time. Through reasonable process arrangement and equipment coordination, the quality and efficiency of concrete construction can be significantly improved, which is suitable for large-scale ground projects such as industrial plants, parking lots, and airport runways.

    The scraper of the concrete laser leveling (also known as the "scraper plate" or "leveling plate") is its core vulnerable part, and its condition directly affects the construction quality of the floor. The replacement of the scraper cannot be determined solely based on how long it has been used, but should be comprehensively judged according to the form of its wear and the resulting construction consequences. The following are the clear signals that need to be replaced: Key indicator: The depth of the wear groove at the bottom of the scraper. Replacement standard General standard: When the depth of the worn groove reaches 3 to 5 millimeters, it must be replaced. You can place a ruler horizontally at the bottom of the scraper. If a one-yuan coin (about 1.85mm thick) can be easily inserted and there is still a clear gap, it is very close to the replacement critical point. Conservative standard: For projects with high standards (such as super flat floors and epoxy floors), when the wear reaches 2-3 millimeters, replacement should be considered to ensure the best distribution of surface slurry and compaction effect. Abnormal wear pattern Uneven wear (oblique wear) : The wear at both ends of the scraper is inconsistent, resulting in one side being higher than the other. This is usually caused by improper equipment leveling or operating habits. As long as one side reaches the above-mentioned wear depth, it needs to be replaced. Irregular wear: Deep pits or wavy wear appear on the surface of the scraper, which will affect the uniformity of the scraper. Even if the wear measurement values do not fully meet the standards, the scraper should be inspected and replaced immediately if the following construction quality problems occur: Difficulty in lifting slurry: The scraper cannot effectively carry the cement slurry to the surface, resulting in exposed aggregates and a rough surface. The flatness has declined: After construction, the floor shows obvious waves or slight undulations, and the precision of the laser leveling cannot be perfectly reflected. Scratches appear: Severely worn edges of the scraper may become sharp or damaged, leaving scratches on the already leveled surface. Abnormal vibration of the equipment: Severely worn scrapers can alter the vibration characteristics of the leveling, sometimes leading to unstable movement or uneven vibration of the equipment. Core principle: The function of the scraper is to "level", "lift the slurry" and "compact". Once it fails to perform these duties perfectly, it's time to replace it. Don't sacrifice the quality of the entire floor just to save the cost of one scraper; otherwise, the cost of later repairs will be much higher. The answer is: It's not troublesome, but it requires care and correct steps. This is a routine maintenance operation that a skilled operator can complete within 15 to 30 minutes. The following are the general steps and precautions for replacement: Replacement steps Safety first Completely turn off the engine/power supply of the leveling. Stop the machine on a flat and solid ground. If it has just been used up, make sure the scraper and related components have cooled down to avoid burns. Raise and fix the machine Use the randomly provided jack or support rod to steadily lift the front end of the machine, lifting the scraper off the ground for convenient operation. Disassemble the old scraper Find the bolts or clamps that fix the scraper. These are usually located above or on the side of the scraper support. Use an appropriate wrench (usually an open-end wrench or socket wrench) to loosen and remove all the fixing bolts counterclockwise. (Note) Some models of scrapers are relatively heavy. When removing the last bolt, hold it with your hand to prevent it from suddenly falling and injuring your feet. Clean the installation surface Before installing the new scraper, be sure to clean the concrete residue and debris at the bottom of the scraper support with a scraper and brush. A flat and clean installation surface is the prerequisite for ensuring that the new scraper is installed straight. Install a new scraper Align the new scraper with the bracket and ensure it is perpendicular to the machine's central axis. First, screw on all the fixing bolts by hand to ensure that the threads are aligned. Use a wrench to tighten the bolts step by step in a diagonal and cross sequence. This can ensure that the scraper is evenly stressed and will not deform or generate installation stress. Inspection and Debugging Put down the machine, start the equipment, and run it unloaded for a few minutes to check if there is any abnormal shaking of the scraper. A test scrape can be conducted (on the waste material or in the area to be poured) to observe the ground effect and ensure the installation is correct. Details to note Bolt torque: Tighten the bolts strictly in accordance with the torque specified in the equipment manual. If it is too loose, the scraper will shift during operation. Excessive tightness may damage the bolt threads or the fracturing scraper support. Scraper type: Ensure that the model, size and material (usually polyurethane or hard alloy) of the new scraper are exactly the same as those of the old one. The performance and wear life of scrapers made of different materials vary. Spare parts: For important construction projects, 1-2 new scrapers should always be kept on site just in case.   The judgment of replacement relies on precise measurement and observation of construction quality, while the execution of replacement is a standardized and simple mechanical operation. Developing the habit of regularly checking the wear of the scraper is the key to ensuring that the concrete laser leveling machine always produces high-quality floors.   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.