About the Shandong Wanshi Machinery Technology Co., Ltd.

    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.    

Environmental protection of concrete laser leveling machine I. Introduction With the global emphasis on environmental protection, the construction industry has begun to turn to green and sustainable construction methods. As a modern construction machinery and equipment, concrete laser leveling machine has been widely used around the world. This kind of mechanical equipment can not only improve construction efficiency, but also play an important role in reducing energy consumption and environmental pollution. This article will take an in-depth look at the environmental friendliness of concrete laser levelings and their importance in the construction industry. 2. Working principle of concrete laser leveling machine Concrete laser leveling machines mainly use laser alignment technology to level the concrete surface. The laser transmitter emits a laser beam, and by adjusting the angle and position of the reflector, the laser beam is accurately projected onto the receiver. When the height of the concrete surface changes, the receiver can detect the deviation of the laser beam and feed this information back to the control system. The control system adjusts the driving path of the leveler and the working status of the vibrator based on this information to ensure a smooth concrete surface. 3. Environmental protection analysis ◆Low energy consumption:  The concrete laser leveler uses advanced laser technology, which consumes less energy than traditional manual or manual leveling machines. This helps reduce carbon emissions from the construction industry, thereby slowing the rate of global warming. ◆Reduce material waste: Because the concrete laser leveling machine has a high-precision leveling effect, it can reduce the amount of concrete used and also reduce the dependence on additional materials. This not only reduces construction costs but also helps reduce pressure on natural resources. ◆Reduce noise pollution: The noise generated by the concrete laser leveling during the working process is relatively low, and no strong vibration is generated during the working process. This can reduce the impact on the surrounding environment and create a more comfortable working environment for the construction team. ◆Improve construction efficiency: The concrete laser leveling machine has high efficiency and can complete a large amount of concrete leveling work in a short time. This helps shorten the construction period, thereby reducing impacts on surrounding communities and issues such as traffic congestion. ◆Strong adaptability: The concrete laser leveling machine has strong adaptability and can work in different construction environments. Whether it is a large construction project or a small residential area project, efficient and environmentally friendly construction can be achieved with a concrete laser leveling. ◆Predictability: By using a concrete laser leveling, precise control of the concrete surface can be achieved, reducing the need for rework and repairs. This not only helps save energy and resources but also reduces environmental impact. ◆Low maintenance cost: The maintenance cost of concrete laser leveling machine is relatively low. Thanks to its advanced laser technology, maintenance personnel can quickly detect and repair equipment faults to ensure normal operation. This low maintenance helps reduce operating costs in the construction industry while also helping to reduce environmental impact. ◆Promote sustainable development: By using concrete laser leveling machines, the construction industry can better achieve sustainable development goals. This kind of mechanical equipment can not only improve construction efficiency, but also play an important role in reducing energy consumption, reducing material waste, and reducing noise pollution. These characteristics make the concrete laser leveling one of the important tools to promote sustainable development. 4. Conclusion To sum up, the environmental protection of concrete laser leveling is mainly reflected in the following aspects: lower energy consumption, reduced material waste, reduced noise pollution, improved construction efficiency, strong adaptability, predictability, low maintenance cost and Promote sustainable development, etc. These characteristics make concrete laser leveling an efficient and environmentally friendly construction method, providing strong support for the construction industry to achieve sustainable development goals.

A laser leveling is a piece of equipment used in concrete construction that uses laser technology to measure and adjust the flatness of concrete floors. Here are some of the ways a laser leveling ensures floor flatness: Laser transmitter: The laser leveling is equipped with a laser transmitter that emits a horizontal laser beam. This laser beam is used as a reference line to determine if the concrete floor is flat. Receiver: The laser leveling is also equipped with a receiver that detects the position of the laser beam and compares it to the actual floor. If the floor is not flat, the receiver sends a signal to the operator indicating that adjustments need to be made. Automatic adjustment: Some advanced laser levelings have an automatic adjustment function that automatically adjusts the height and angle of the machine based on the information received to ensure the flatness of the concrete floor. High-precision sensors: Laser levelings are usually equipped with high-precision sensors that can accurately measure the flatness of the concrete floor and transmit data to the control unit for necessary adjustments. Through the above methods, laser levelings can ensure the flatness of concrete floors in commercial facilities, providing customers with a better experience. For example, in places such as shopping malls and hotels, a flat floor is essential for walking comfort and safety. In addition, a flat floor can improve space utilization and make commercial facilities look neater and more professional.