The Main Points of Small Roller in Subgrade Construction

  The evaluation of the operator's understanding and mastery of the laser leveling machine operating procedures can be carried out through the following steps:   – Through written tests or online assessments, the operator's theoretical knowledge of the laser leveling machine is evaluated, including equipment structure, working principle, operating steps, safety procedures, etc. – Observe the operator's performance in actual construction and evaluate whether he can skillfully start, adjust, operate and troubleshoot the equipment. – Let the operator operate in a simulated environment to evaluate his proficiency in equipment control and his ability to respond to emergencies. – During the actual operation, experienced supervisors will supervise the operator on-site and provide immediate feedback and guidance. – By setting simulated faults, the operator's ability to diagnose and handle equipment faults is evaluated. – Check whether the operator strictly complies with the safety operating procedures, including wearing personal protective equipment, and complying with the inspection and maintenance procedures before and after operation. – Evaluate the operator's operating effect by checking the quality indicators such as ground flatness and levelness after construction. – Regularly provide continuous education and training to operators to ensure that they have a full understanding of the latest operating procedures and equipment updates. – Develop a set of detailed assessment standards, including multiple dimensions such as operating skills, theoretical knowledge, and safety awareness, to comprehensively evaluate the operator's capabilities. – Through actual operation assessment, let the operator independently complete a series of operating tasks under supervision to evaluate their ability to operate independently. Through the above methods, the operator's understanding and mastery of the laser leveling machine operating procedures can be comprehensively evaluated to ensure construction safety and construction quality.

– Before construction, the site should be thoroughly cleaned to remove debris, garbage and loose parts of the original ground. For example, for the renovation project of old factory buildings, all oil stains and broken concrete blocks on the ground need to be cleaned up. For the base, if there is any unevenness, it needs to be repaired and compacted. If the base is a soil foundation, it should be layered and rolled according to the design requirements to make its compaction degree reach more than 90%, providing a solid foundation for concrete pouring. – At the same time, the drainage slope should be set. According to the purpose of the site and the design requirements, the general drainage slope is not less than 0.3% – 0.5%. Through precise measurement and layout, determine the drainage direction and slope control points to ensure smooth drainage and avoid water accumulation affecting the quality of the floor.   – Select qualified concrete raw materials, including cement, sand and gravel, admixtures, etc. Cement should be selected with strength grades that meet the design requirements, such as ordinary Portland cement P.O42.5 or P.O52.5, and the stability and setting time of cement should be checked. The particle size and mud content of sand and gravel should meet the specifications. For example, the maximum particle size of coarse aggregate should not be greater than 31.5mm, and the mud content should not exceed 1%; the mud content of fine aggregate should not exceed 3%. – Strictly design and test the concrete mix ratio. According to the use function of the floor (such as heavy-duty industrial floor, ordinary warehouse floor, etc.), strength requirements and construction environment, the best mix ratio is determined through laboratory trial mixing. During the construction process, concrete mixing should be carried out strictly according to the mix ratio, and the performance indicators such as slump of concrete should be tested regularly. The slump is generally controlled between 120-180mm to ensure good working performance of concrete.   – Before construction, fully commission the concrete laser leveling machine. Check the operating status of the engine or motor to ensure the normal operation of the power system. For example, the engine should start quickly, run smoothly, and have no abnormal noise and shaking. For the laser system, it is necessary to perform precise calibration and adjust the height and angle of the laser transmitter so that the laser plane it emits is consistent with the design elevation of the floor. – Calibrate the scraper, vibrator and other working parts of the leveler. The flatness error of the scraper should be controlled within ±1mm, and the frequency and amplitude of the vibrator should be adjusted according to factors such as the slump and thickness of the concrete. Generally, the vibration frequency is between 3000-5000 times/minute, and the amplitude is between 3-5mm to ensure that the concrete can be fully vibrated and leveled.   – Use appropriate concrete pouring methods, such as pumping or self-unloading. During the pouring process, the pouring speed and height should be controlled to avoid segregation of concrete. For example, when pumping concrete, the discharge port height should not exceed 1.5m, and the concrete should be evenly distributed on the site. – Use the spreading function of the laser leveler or cooperate with other spreading equipment to spread the concrete evenly on the site. The thickness of the material should be slightly higher than the design elevation, generally 10-20mm higher, to leave a margin for the leveling work. During the material laying process, care should be taken to avoid the accumulation of concrete in one place, resulting in excessive local thickness.   – When operating the laser leveling machine, the equipment should be kept moving at a uniform speed, and the speed is generally controlled between 1-2m/min. The operator should adjust the scraper height and vibration frequency of the leveling machine in time according to the laser signal and the automatic leveling function of the equipment. For example, when the laser receiver detects that the ground is higher than the design elevation, the leveling machine automatically adjusts the scraper to descend and scrapes off excess concrete; when it is lower than the design elevation, the scraper rises, and the vibrator strengthens the vibration to fill the low-lying area with concrete. – During the leveling process, attention should be paid to the connection of adjacent construction areas. The leveling work of adjacent areas should be completed before the initial setting of the concrete, and the flatness and density of the connection should be guaranteed. Generally, the overlapping construction method is adopted, and the overlapping width is between 10-20cm to ensure the flatness and integrity of the entire floor.   – Professional quality inspection personnel are equipped to check the flatness, density and elevation of the floor in real time during the construction process. Use tools such as level, 2m ruler and feeler gauge for inspection. For example, for each construction area (such as 100-200 square meters), use 2m ruler and feeler gauge to check the flatness, and the flatness error should be controlled within ±3mm; use level to check the elevation, and the elevation error should be controlled within ±5mm. – For parts that do not meet the quality requirements, timely adjustments and repairs should be made. If it is found that the local flatness exceeds the tolerance, it can be repaired by using a small leveling tool or manual smoothing method; for areas with insufficient density, use a flat vibrator to vibrate again or an inserted vibrator to supplement the vibration.   – After the concrete is leveled, the finishing treatment is carried out according to the use requirements of the floor. If it is an industrial floor that requires wear resistance, mechanical smoothing and manual fine smoothing can be carried out after the initial setting of the concrete. Mechanical troweling generally uses a driving trowel, and the number of troweling passes is not less than 3 times, so that the floor surface reaches a certain gloss and hardness. – After finishing, timely maintenance should be carried out. You can use methods such as covering with plastic film, straw mats or spraying curing agents. The curing time is determined according to factors such as the type of concrete and the ambient temperature, and is generally not less than 7-14 days. During the curing period, the concrete surface should be kept moist to avoid cracks in the concrete due to water loss.   – During the curing period, the floor should be protected as a finished product, and warning signs should be set up to prevent people and vehicles from walking or working on the floor that does not meet the strength requirements. For example, for heavy-duty industrial floors, heavy vehicles are strictly prohibited from passing when the concrete strength does not reach more than 70% of the design strength. – After the curing period, quality acceptance is carried out in accordance with design requirements and relevant standards. The acceptance content includes indicators such as the flatness, strength, and thickness of the floor. For example, the thickness and strength of the floor can be tested by core sampling, and the strength should reach the designed strength level; a laser flatness meter is used to test the flatness of the entire floor to ensure that the flatness of large-area floors meets quality requirements.

To optimize the construction effect of the concrete laser leveling machine, the laser receiver can be adjusted by the following methods: 1. Calibrate the laser receiver: Before construction, calibrate the laser receiver to ensure it is in the correct position and angle. Through calibration, the initial error of the laser receiver can be eliminated and the accuracy and stability of construction can be improved. 2. Adjust the sensitivity of the laser receiver: According to the construction environment and conditions, appropriately adjust the sensitivity of the laser receiver. In an environment with more interference factors, you can choose to increase the sensitivity of the laser receiver to better capture the laser signal. In a quieter environment, the sensitivity can be appropriately reduced to reduce false triggering. 3. Adjust the receiving range of the laser receiver: According to the construction scope and speed, appropriately adjust the receiving range of the laser receiver. In situations where rapid construction is required, there is an option to expand the laser receiver's reception range to cover a wider area. In situations where refined construction is required, the receiving range can be appropriately narrowed to improve the accuracy and stability of construction. 4. Regularly clean and maintain the laser receiver: Keeping the laser receiver clean and in good condition is crucial to optimizing construction results. Clean optics and housings regularly and check for damage or contamination. Use appropriate cleaners and tools for cleaning, and ensure that maintenance and upkeep is performed in accordance with the manufacturer's instructions. 5. Adjustment with other equipment: Ensure good cooperation and synchronization between the laser receiver and other related equipment (such as control systems, sensors, etc.). Learn how to adjust the parameters and settings of relevant equipment to achieve the best construction results by communicating with the supplier or manufacturer's technical support team. 6. Record and monitor the adjustment process: During the process of adjusting the laser receiver, it is recommended to record the detailed steps and parameters of each adjustment. This helps track the effects of adjustments and ensures you can quickly return to optimal performance when needed. At the same time, the construction effect is continuously monitored, and the performance and status of the laser receiver are regularly checked to ensure that it continues to provide accurate signals and stable output. In short, through proper calibration, sensitivity adjustment, reception range setting, maintenance and coordination with other equipment, the construction effect of the concrete laser leveling can be significantly optimized. It is recommended to work with an experienced technician or supplier on the actual application to ensure proper adjustment and optimal performance.