The good choice to improve efficiency, the most cost-effective concrete laser leveling machine

    Using a power trowel to handle large-span and high-standard floor projects is a systematic project, and it is by no means as simple as "starting up and smoothing". It involves the meticulous management of the entire process from the initial preparation, concrete batching, laser leveling to power troweling and finishing. The following are the key technical points of these large-scale and high-standard projects, which are elaborated at three levels: "Basic guarantee", "core control", and "advanced advancement". These key points are the prerequisites for success or failure. If they cannot be achieved, there is no need to talk about anything else. Density and flatness: The foundation must be uniformly compacted to prevent uneven settlement in the later stage. The flatness of the cushion layer (usually gravel or plain concrete) is of vital importance. Its elevation error should be strictly controlled (such as within ±10mm), otherwise a large amount of concrete will be wasted and the final flatness will be affected. Waterproofing and moisture-proofing: In areas with high groundwater levels, reliable waterproof and moisture-proof layers must be applied to prevent water vapor from rising and affecting the quality and service life of concrete.   Low water-binder ratio: This is the lifeline of high-strength and wear-resistant floors. The water-cement ratio is usually required to be controlled below 0.45, and the lower the better. A low water-cement ratio can reduce bleeding, enhance strength and wear resistance, and minimize shrinkage cracks. Aggregate selection: Choose coarse and fine aggregates with good gradation and high hardness. The maximum aggregate particle size should not be too large (usually ≤25mm) to ensure the uniformity of the surface slurry. Admixtures and additives Mineral powder/fly ash: Reasonable use can improve workability, reduce hydration heat, and decrease temperature difference cracks. Water reducing agent: Highly efficient water reducing agents must be used to significantly reduce water consumption while ensuring fluidity. Fiber: In large-span floor slabs, it is strongly recommended to add polypropylene synthetic fibers, which can effectively suppress plastic shrinkage cracks in concrete.   Reasonable pouring sequence and direction: Develop a detailed pouring plan to ensure continuous supply of concrete and avoid cold joints. For large-scale construction, it is necessary to pour in separate compartments and arrange the construction joints reasonably. This is the core operational step to achieve high flatness and high finish. High-precision laser leveling Equipment selection: A laser leveler with a laser emitter + laser receiver + automatic control hydraulic system must be used. This is the only way to achieve ultra-high flatness. Reference setting: The position of the laser emitter must be stable to ensure that there is no signal obstruction throughout the entire operation area. The elevation control points need to be rechecked multiple times. The "one-time molding" concept: The laser screed integrates scraping, vibration and leveling into one, leveling the concrete at the designed elevation in one go to form a dense and uniform base layer. This is the foundation for the subsequent work of the polishing machine. The "golden time window" for operating a power trowel machine The operation of the power trowel must closely follow the initial setting process of the concrete and be carried out in stages: Phase One: Preliminary slurry extraction (before initial setting) Timing: After the concrete pouring and laser leveling, when a person stands on it and sinks by about 3-5mm. Equipment: Use a disc smear. Operation: Run at low speed, press down the protruding aggregates on the surface, bring up the slurry, eliminate the slight tooth marks left by the screed, and make the surface tend to be uniform. The aim is not to smooth it out, but to compact and lift the slurry. Phase Two: Compaction and Polishing (initial setting to final setting) Timing: When a person stands and sinks about 1-2mm, there is no standing water on the surface, and a slight indentation appears when pressed with a finger. This is the most crucial moment. Equipment: Replace with a blade (power trowel). Operation Angle control: At the beginning, the Angle between the power trowel blade and the ground should be small (almost parallel) to perform low-speed and large-area finishing. Multiple cross-operation: Cross the light at least 2 to 3 times along both the longitudinal and transverse directions. Each time, increase the blade Angle appropriately compared to the previous time and raise the rotational speed. Objective: Eliminate the marks left by the disc, fully compact the surface slurry, and achieve a dense and bright effect. Phase Three: Final Calendering (before final setting) Timing: When standing on it, there is almost no sinking. Only by pressing hard with fingers can marks be left. Operation: The blade is at the maximum Angle to the ground and runs at high speed. This polishing is done to achieve an extremely high degree of smoothness and eliminate all spatula marks. Note: All operations must be completed before the concrete loses its plasticity. It is strictly prohibited to sprinkle water or cement for finishing.   For airports, high-standard factories, etc., the following key points also need to be considered: Seam treatment technology Precise joint cutting: Cutting should be carried out immediately when the concrete reaches a certain strength (usually 6 to 12 hours after pouring, when it can be cut with a toothless saw without chipping). The depth of the cut seam should be 1/3 to 1/4 of the plate thickness, aiming to induce shrinkage cracks to occur at the predetermined position. Grouting material: Use high-quality and durable grouting glue to protect the seam edge from being damaged by hard objects such as forklifts. A complete maintenance system Timeliness: Start curing immediately after the final finishing is completed and the concrete surface is about to dry. Method selection Spray curing agent: Most suitable for large-scale construction, it can form a film to prevent water evaporation. It is necessary to ensure that the spraying is uniform and full coverage. Covering and water retention maintenance: If geotextiles, films, etc. are used for covering and continuous watering for moisture retention, the effect is the best but the cost is relatively high. Curing period: At least 7 days. For high-grade concrete with crack resistance requirements, it is recommended to cure for 14 days. Construction of special functional layers (if necessary) Wear-resistant aggregates (quartz sand, metal, alloy) : The timing of spreading: It should be carried out after laser leveling and before initial setting when the base concrete reaches a state "sufficient to bear the weight of people and spreader". Spread in several portions: Spread at least twice (60%/40% of the total amount) to ensure even distribution. Integrated finishing: After spreading, the wear-resistant aggregate is completely pressed into the surface layer of the concrete through the disc and blade operation of the power trowel machine and integrates with it. Sealant curing agent Construction should be carried out after the curing period has expired and the floor is completely dry. Through effective penetration and chemical reactions with the components in concrete, it can significantly enhance surface hardness, wear resistance and impermeability, making it a powerful tool for creating ultra-long-life floors. Stage Key points Objectives and Descriptions Preparatory work The foundation cushion layer is flat and dense Provide a stable foundation for the floor Low water-cement ratio concrete + fiber Ensure the material's own strength and crack resistance Core construction High-precision laser leveling The foundation for achieving ultra-high flatness (FF/FL value) Master the "Three Stages" of polishing The initial setting involves extracting the slurry, finishing before the final setting, and finally calendering to achieve a smooth finish Post-processing Cut the seams accurately and promptly Guide and control shrinkage cracks Maintain with sufficient time and materials Ensure the development of concrete strength and prevent cracking Function improvement Wear-resistant aggregates are evenly spread and integrated Enhance the surface wear resistance and impact resistance Penetrating sealant curing agent Significantly enhance hardness, density and chemical resistance The key to success lies in integrating all the above points into a seamless and controlled process. Any oversight in any link may lead to all previous efforts being wasted. Therefore, a high-quality construction team, advanced equipment and strict on-site management are all indispensable.   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.    

– Using laser leveling technology, the laser transmitter generates a precise and stable plane reference. The laser receiver is installed on the leveling machine to sense the deviation in real time, so that the leveling machine automatically adjusts the scraper height to ensure that the floor flatness error is extremely small, which can generally be controlled within ±1.5mm, and can meet the needs of high-end industrial plants, electronic chip manufacturing workshops and other places with strict requirements on flatness. – Optimize the concrete mix ratio, add appropriate amounts of expansion agents, fibers and other admixtures, reduce the shrinkage stress during the hardening process of concrete, and cooperate with the carefully designed construction process, so that the floor does not need to set expansion joints in a large area, which is not only beautiful but also reduces the later maintenance cost, and avoids the accumulation of dust and debris caused by cutting seams. – In the initial setting stage of concrete, wear-resistant materials such as corundum and metal aggregates are evenly spread, and a special trowel is used to closely combine with the floor to form a hard and wear-resistant surface layer. The wear resistance can be several times higher than that of ordinary concrete floors. It is suitable for places with frequent wear and tear such as heavy traffic areas, warehouses, and logistics centers. – From base treatment, concrete pouring, leveling to wear-resistant material spreading, troweling and finishing, the processes are closely connected and completed in one go, avoiding the problem of poor interlayer bonding caused by layered construction, improving the overall strength and durability of the floor, and reducing the construction period. It can usually shorten the construction period by 1/3 – 1/2 compared with traditional processes. Applicable to indoor and outdoor concrete floor projects with large areas and high requirements for flatness and wear resistance, such as various large industrial plants, logistics storage centers, airport terminals, exhibition halls, parking lots, etc., especially suitable for places where obvious expansion joints are not expected to affect the appearance or use function. – The laser transmitter emits a rotating laser beam to form a high-precision horizontal control surface. The laser receiver installed on the leveling machine continuously captures the laser signal, compares the actual elevation of the floor with the laser plane benchmark, and transmits the generated deviation signal to the control system. The control system drives the hydraulic actuator of the leveling machine to adjust the scraper, vibrator and other components in real time to accurately level and vibrate the concrete to achieve high-precision leveling. – On the one hand, by optimizing the concrete mix ratio, selecting low-hydration hot cement, adding an appropriate amount of expansion agent (such as calcium sulfoaluminate expansion agent) to compensate for concrete shrinkage, adding polypropylene fiber to enhance concrete toughness and inhibit the generation of microcracks; on the other hand, during the construction process, strictly control the concrete pouring temperature, vibration method and curing conditions, reasonably arrange the construction sequence, reduce the temperature difference between the inside and outside of the concrete and stress concentration, so that the floor itself has the ability to resist shrinkage and deformation, thereby meeting the requirements of no seam cutting. – The surface of concrete in the initial setting stage has a certain viscosity. At this time, the spread wear-resistant material can be embedded in the surface of the concrete. With the subsequent leveling and finishing operations, the wear-resistant material and the concrete form a solid whole. Wear-resistant materials such as corundum and metal aggregates have high hardness and strong wear resistance, forming a wear-resistant protective layer on the surface to protect the main concrete of the floor from wear. – Technical preparation: Familiar with the construction drawings and technical specifications, formulate detailed construction plans, and conduct technical briefings. – Site preparation: Clean up the site debris and accumulated water, level the base layer, and if the base layer is soft soil, it needs to be reinforced; set up a temporary drainage system for construction; plan the concrete pouring and leveling route according to the site area and shape. – Material preparation: Purchase high-quality cement, sand, gravel, admixtures, wear-resistant materials, etc. according to the design requirements, inspect the raw materials to ensure that they meet the quality standards; prepare sufficient construction water and electricity. – Equipment preparation: Debug concrete laser leveling machine, concrete mixing equipment, transportation equipment, wear-resistant material spreader, trowel, etc. to ensure the normal operation of the equipment; calibrate the laser system so that the laser plane it emits is consistent with the designed elevation of the floor. – Thoroughly clean the surface of the base to remove pollutants such as dust and oil; compact the base with a roller or tamping machine to achieve a compaction degree of more than 90%; repair and fill local low-lying areas and potholes with concrete or mortar to ensure that the flatness error of the base does not exceed ±10mm. – Accurately weigh the raw materials according to the designed mix ratio, use a forced mixer to mix the concrete, and the mixing time is not less than 90 seconds to ensure the uniformity of the concrete; transport the concrete to the construction area by pumping or unloading, control the pouring speed, avoid concrete segregation, and the pouring thickness is slightly higher than the designed floor elevation by 10-20mm to reserve space for leveling. – Start the laser leveling machine and make it move forward at a uniform speed of 1-2m/min; the operator adjusts the scraper height and vibration frequency of the leveling machine in real time according to the feedback signal of the laser receiver to ensure that the concrete surface is flat and compacted; the leveling work of adjacent areas should be completed before the initial setting of the concrete, and the overlapping construction width should not be less than 10cm to ensure the integrity of the floor. – When the concrete is initially set (generally there are slight footprints when stepping on it, and the sinking depth is about 3-5mm), use a special spreader to evenly spread the wear-resistant materials on the floor surface according to the specified amount, and the spreading thickness is generally 3-5mm; during the spreading process, pay attention to controlling the spreading speed and direction to avoid accumulation or leakage of wear-resistant materials, and ensure that the spreading uniformity reaches more than 90%. – After spreading the wear-resistant material, use a trowel to smooth it immediately. The trowel should run in a crisscross pattern to fully blend the wear-resistant material with the concrete. The number of smoothing passes should be no less than 3 times. As the concrete continues to harden, when there is no water stain on the surface and it feels slightly hard when pressed with fingers, it should be smoothed manually. Aluminum alloy rulers, trowels and other tools should be used to make the floor surface bright and smooth. – After smoothing and finishing, the floor should be maintained in time by covering with plastic film, spraying curing agent or laying water straw mats. The maintenance time should be no less than 7 days. During this period, the concrete surface should be kept moist to avoid water loss and cracks. Warning signs should be set up during the maintenance period to prohibit vehicles and pedestrians from passing on floors that do not meet the strength requirements. – Calibrate the laser system before construction to ensure the accuracy of the laser plane; regularly check the flatness with a 2m ruler and a feeler gauge during construction, at least once every 100-200 square meters, and adjust the leveler in time if deviation is found; use a laser flatness meter to fully test the flatness of the floor after finishing to ensure that it meets the design requirements. – Strictly select wear-resistant materials according to design requirements and check the quality certification documents of wear-resistant materials; supervise the spreading amount and uniformity during spreading to ensure that the specified requirements are met; after maintenance, on-site wear resistance tests can be carried out, such as grinding a certain area with a grinding wheel, observing the wear condition, and judging whether the wear resistance meets the standard. – Optimize the concrete mix ratio, control the cement dosage and water-cement ratio; monitor the concrete pouring temperature to avoid high-temperature pouring; strengthen maintenance and control the temperature difference between the inside and outside of the concrete; regularly inspect the floor, and if fine cracks are found, use epoxy resin and other materials to repair them in time. 1. Provide safety training to construction personnel to familiarize them with the operation methods and safety precautions of construction equipment, such as the safety operating procedures of laser levelers, concrete mixers and other equipment. 2. Set up obvious safety warning signs at the construction site to divide the construction area and non-construction area to prevent unrelated personnel from entering the construction danger zone. 3. Regularly check the safety performance of construction equipment, such as electrical insulation, mechanical protection devices, etc., to ensure the normal operation of the equipment and avoid safety accidents caused by equipment failure. 4. Provide construction personnel with necessary personal protective equipment, such as safety helmets, safety shoes, gloves, etc., to ensure the personal safety of construction personnel. 1. Classify and collect solid waste such as concrete residues and discarded wear-resistant material packaging bags generated during the construction process, and transport them to designated garbage disposal sites regularly. 2. Reasonably arrange construction time to avoid high-noise concrete mixing, equipment operation and other operations during residents' rest time. If necessary, take noise reduction measures, such as installing silencers on equipment. 3. Control dust on the construction site, such as covering the material storage area, closing the transport vehicles, regularly sprinkling water to reduce dust, and keeping the construction site clean. – The one-time molding process shortens the construction period, reduces labor costs, equipment rental costs, etc.; no cutting reduces the later maintenance costs, such as cutting, caulking material costs and labor maintenance costs; wear-resistant flooring increases the service life of the flooring, reduces the frequency of flooring replacement, and the overall economic benefits are significant.   – It provides high-quality flooring solutions for various large-scale projects, meeting the needs of rapid development of modern industry, logistics and other industries; it reduces noise, dust and other pollution during construction, which is conducive to environmental protection and sustainable development of urban construction. In a large electronic chip manufacturing plant construction project, this construction method was used to successfully create a high-precision, no-cutting, wear-resistant factory floor. The construction area reached 50,000 square meters, and the flatness error was controlled within ±1mm, meeting the stringent requirements of chip manufacturing equipment for floor flatness. In the subsequent years of use, the floor had good wear resistance and no obvious cracks appeared, providing a solid guarantee for the efficient production of the factory. For example, in a certain international logistics and warehousing center project, this construction method also performed well, and a large area of ​​floor was built quickly and efficiently. The seam-free design improved the aesthetics and practicality of the warehouse and was highly recognized by the owner.

In recent years, with the continuous development of the economy and society, there are more and more construction demands for large-area sites such as parking lots, large squares, and industrial plants, because these sites mainly use concrete to pour the foundation on site, and then cover it with floor tiles or floor tiles. Flat paint, so higher requirements are put forward for the flatness of the base layer. In order to ensure that the flatness of the ground after construction reaches an ideal level, a concrete laser leveling machine is required at this time. So, what is the difference between concrete laser leveling machine construction and manual construction? What are the significant construction advantages of the concrete laser leveling machine itself? █Traditional construction methods The common concrete floor construction method is to manually level it, and then use a trowel to smooth it. This method requires a lot of labor, and the quality of the construction process is not controlled. It needs manual corrections, repeated measurement and adjustment of the ground under construction, and the efficiency is not high. The construction of large-area concrete floors requires the use of a large number of wooden or metal plates in advance to form the side formwork, and the height of the side formwork is measured by a level to control the height of the concrete after laying. Due to the need to use a level instrument for multi-point measurement, re-measurement is required after the side formwork is laid to ensure accuracy. Therefore, the process is prone to human error. In addition, the dismantling of the side formwork also requires a lot of labor. █Intelligent construction method 1. Operating principle Pre-set up the Topcon laser transmitter on the construction site to provide the working elevation reference surface, use the Topcon receiver LS-B110 fixed on the laser leveling machine to receive the laser elevation position signal, and transmit the real-time elevation position signal to the controller, which automatically controls The electric push rod or hydraulic system of the concrete laser leveling machine ensures that the elevation of the receiver is equal to the reference surface, and the mechanical device of the leveling machine realizes paving according to the set height. 2. Construction advantages The advantages of using concrete laser leveling machine for concrete leveling are highlighted in the following aspects: (1) It can easily lay high-strength concrete, low-slump concrete and fiber cement concrete; (2) The construction quality is high, and the leveling quality of the laser leveling machine is more than three times higher than that of the traditional manual construction method, reaching an ultra-flat ground; (3) Improve work efficiency and save labor. Concrete laser leveling machine is used for construction to shorten construction time, improve work efficiency and save labor; (4) Change the heavy physical labor to mechanical paving, vibrating, leveling, pulping, and plastering, reducing the number of operators, reducing labor intensity, and creating high-quality ground; (5) The application of concrete laser leveling machine not only saves costs compared with traditional manual processes, but also has fewer ground joints and greatly reduces maintenance costs in the later period, thereby significantly improving economic benefits; (6) The use of concrete laser leveling machine can realize large-scale construction, reduce a large number of construction joints, reduce the slump of concrete, ensure the strength of concrete, make the ground integrity good, and cracks are not easy to appear. Summary of this chapter: Although the concrete laser leveling machine is a new equipment with sophisticated technology emerging in recent years, it is widely used in airport runways, high-speed rail platforms, large workshop roads, etc., which have extremely high requirements for ground flatness. In engineering projects, if it can be widely popularized and promoted, it will definitely bring very considerable construction benefits.