Which is better, an electric concrete power trowel or a gasoline powered trowel?

Tell you how effective the concrete laser leveling machine is! Many consumers are still hesitating whether they should buy a concrete laser leveling machine, because they have no concept of the construction effect of the equipment. Today we will introduce the use effect of the equipment. First of all, the biggest feature of this equipment is that it is fast, and the time-consuming is 1/10 of manual work, which is enough to make many construction teams excited; secondly, it is flat, and the ground level error after paving is small , is almost negligible. 1. Requirements for concrete and formwork ① Concrete:  Concrete must be produced, conveyed or pumped to the flooring site by a commercial concrete production plant. ② Concrete specifications: C25~C30 concrete, the strength of which is not less than 25MPa in 28 days, according to the design requirements. ③ Water-cement ratio: N o more than 0.5, no water can be added during the feeding process. ④ Cement: Use ordinary Portland cement with a grade of not less than 42.5. ⑤ Aggregate: Well-graded aggregate should be used. Crushed granite or pebbles are used as coarse aggregate, and the maximum diameter is not more than 25mm. The fine aggregate is clean river sand with a fineness modulus of 2.4-2.7. ⑥ Concrete mix ratio: The amount of cement is not less than 350Kg/m3. In order to avoid surface quality problems, the sand rate should be controlled at 35% to 40%. ⑦ Concrete slump: 14±2cm, maximum 16cm. ⑧ Setting time: The initial setting time should be controlled within 3-5 hours. In order to avoid the excessive deviation of the surface elevation affecting the joints, the formwork should be steel formwork. The height of the formwork should be controlled within +0 and -2mm, and the steel formwork should be within 1-1.2 meters from the surrounding walls. 2. Construction cooperation requirements ① The concrete feeding speed should be determined according to the ground thickness and pouring area to determine the minimum hourly feeding speed. For a floor with a thickness of 200 mm, if the width of one-time pouring reaches 40 meters, the minimum feeding speed should reach 40 cubic meters per hour, otherwise there will be cold joint problems, which will affect the quality of ground construction. ② Manually coordinate the concrete sent to the platform, and workers need to remove it as soon as possible and roughly level it. In addition, the areas around the formwork, walls, columns, trenches, equipment foundations, floor drains or around pipelines that cannot be leveled require manual cooperation for local leveling. Generally, 3-4 workers are required to cooperate with the construction (provided by Party A). ③ Other precautions In order to ensure the flatness of the ground, attention should be paid to: 1) The slump of concrete sent to the platform must be consistent each time. 2) Ensure that the concrete feeding speed reaches 40 cubic meters per hour or above, and the initial setting time of each batch of concrete must be consistent. 3) Ensure that the formwork elevation is accurate and cannot be disturbed during construction. 4) Environmental cooperation. The concrete floor that has just been constructed cannot be exposed to sunlight, wind, rain, etc. that are unfavorable to concrete health. ④ Other requirements: A. In order to avoid random cracks in the floor, the cutting time of shrinkage joints should be carried out as early as possible (within 24 hours). B. At the same time as the construction of the laser leveling machine, there should be no electric welding machines on site, and no reflective objects (such as glass windows). C. The foundation must reach a certain hardness to ensure that the laser leveling machine does not collapse when working on the ground. D. The height of the ground in the factory building shall be calibrated by Party A, and the points must be evenly distributed, and there must be no error in the levelness. E. Pouring concrete must be operated according to the requirements of Party B's technicians.

    ◑◐Construction method: Use a 3-4m light ruler to scrape the concrete surface, remove excess water and slurry, fill the low-lying areas with concrete, vibrate and re-trim, remove and trim the high parts, and then smooth them appropriately. The vibrator rod will also be used to "quickly insert and slowly pull out" to fully vibrate the concrete. The moving distance of each rod is generally not more than 1.5 times its effective radius (can be controlled as 30cm), and the distance from the template is less than 0.5 times the effective radius of the vibration. Vibrate until the slurry overflows on the surface of the concrete mixture, no longer sinks significantly, and no obvious bubbles overflow; then use the vibration beam to walk back and forth 2-3 times to level and raise the slurry to make the surface flat and uniform. ◑◐Applicable scenarios: Applicable to small projects, rural roads with narrow construction sites or relatively low requirements for flatness. For example, some self-built roads in rural areas, internal roads in small factory areas, etc. ◑◐Advantages: The equipment is simple and easy to obtain, the cost is low, the operation is relatively easy, and the technical requirements for operators are relatively low. ◑◐Disadvantages: The construction efficiency is low, the labor intensity of manual operation is high, the flatness control accuracy is limited, and it is difficult to meet the requirements of large-area, high-precision road projects. ◑◐Construction method: The laser emitted by the transmitter is used as the reference plane, and the leveling head is controlled in real time through the laser receiver on the laser leveling machine. Just like the laser leveling machine equipped with a HONDA GX690 engine (power 18.4kW/25HP, fuel tank capacity 19L), the steel bar is tied after the formwork of the civil engineering project. Before pouring concrete, the elevation is set on the column reinforcement and led to the laser leveling control system. When the pouring personnel scrape the elevation, the elevation is controlled to be 5-10mm higher than the design elevation, and then the machine operator uses the equipment to accurately level the concrete surface. The leveling width is 3m (9.84ft), and it adopts hydraulic screw conveying paving mode. The vibration system is hydraulic vibration, with a maximum excitation force of 2000N, which can be automatically calibrated and controlled at a certain frequency. After the water seepage of the concrete pouring surface is completed, the laser leveling instrument is used for re-measurement, the water accumulation is filled, and the 3-meter scraper is used to rotate and level it, and then the single-disc trowel is used to level the slurry. ◑◐Applicable scenarios: It is widely used in large-scale industrial plants, large shopping malls, warehouses, underground garages, airport runways, docks and other large-scale concrete floor projects with high requirements for ground flatness, horizontality and strength. For example, the workshop floor of a large automobile manufacturing plant, the floor of a large logistics storage center, etc. ◑◐Advantages: It can achieve high-precision and fast leveling of concrete, and the flatness and levelness of the ground are more than 3 times higher than conventional methods, and the density and strength are increased by more than 20%; it can improve work efficiency by more than 50% and save about 35% of labor; it can lay high-strength concrete, low-slump concrete and fiber concrete; and it can also automatically control the longitudinal and transverse slopes. The equipment has an all-aluminum body and is light in weight (net weight 835kgs / 1841lbs), which is convenient for operation under various working conditions. It is also equipped with an anti-skid system, a hydraulic brake system and a trailer system, a more precise height adjustment rod, a standard soft landing system for the working head, and switch detection and valve port calibration functions to ensure stable machine performance after long-term use. It is also equipped with two types of tires (inflated narrow tires and inflated wide tires) to adapt to different working conditions. ◑◐Disadvantages: The equipment has high purchase costs, high professional and technical requirements for operators, and requires professional training; the site requirements are relatively high, and it is inconvenient to operate in narrow and complex terrain sites. ◑◐Pre-construction preparation skills: Before construction, ensure that the roadbed is stable, the formwork is strong and installed straight and flat, and set up a support device every 1m. Accurately measure and lay out the construction site to determine the road elevation and slope. At the same time, clean the construction site to ensure that the ground is clean, dust-free, and oil-free. If there are cracks or unevenness on the ground, it needs to be repaired first. In addition, the quality control of raw materials and mechanical debugging must be done well to ensure the quality of concrete and the normal operation of equipment (such as the laser leveling machine equipped with the HONDA engine mentioned above). ◑◐Concrete spreading skills: Spread the material during pouring. When unloading with a dump truck or a mixer truck, it is strictly forbidden to concentrate the material on a few points to prevent concrete accumulation and ensure that the concrete mixture is evenly distributed. ◑◐Vibration operation skills: Use the vibrator to "insert quickly and pull out slowly" to avoid missing vibration and over-vibration. Control the moving distance of the vibrator and the distance from the formwork. For equipment using a hydraulic vibration system (such as the relevant laser leveling machine), the exciting force should be reasonably adjusted according to the characteristics of the concrete and construction requirements. ◑◐Surface treatment skills: Correct minor defects in the leveling process in time; rub the surface with a grinding disc to compact the slurry before the initial setting to eliminate water seepage channels and tiny cracks; complete the finishing and embossing processes before the final setting, and finish 3-4 times. Moisturize in time during hot and windy weather in summer to prevent the surface from evaporating too quickly and forming a hard shell. ◑◐Equipment upgrade and reasonable configuration: When conditions permit, give priority to equipment such as advanced laser leveling machines with the above parameters. Its hydraulic screw conveying paving mode and larger leveling width can improve construction efficiency. At the same time, according to the scale of the project and the conditions of the construction site, reasonably match other auxiliary equipment, such as concrete mixers, pump trucks, etc., to ensure smooth connection between concrete supply and construction. ◑◐Construction process optimization: Scientifically plan the construction sequence and operation area, adopt a segmented flow operation method, and reduce the waiting time between each process. For example, reasonably arrange the connection between concrete pouring, vibration, and leveling with a laser leveler (operated according to its performance parameters) to avoid idle work. ◑◐Personnel training and management: Strengthen the skills training of operators to enable them to master the operation of construction equipment (especially laser levelers) and construction processes, and improve their operating proficiency and accuracy. At the same time, optimize the division of labor, clarify the responsibilities of each position, and improve the efficiency of teamwork. ◑◐Strictly control the quality of raw materials: Select raw materials such as cement, aggregates, and admixtures of qualified quality, control the mix ratio, and ensure that the strength and workability of concrete meet the design requirements. For example, cement should be selected from brands with stable strength and reliable quality, and the particle size and mud content of aggregates should meet the standards. ◑◐Strengthen process quality inspection: During the construction process, use measuring instruments such as levels and theodolites to monitor road elevation, flatness, slope and other indicators in real time, and make timely adjustments when deviations are found. At the same time, do a good job in testing the slump of concrete and the compaction density. For laser leveling machine construction, it is necessary to regularly check whether the laser system and hydraulic system of the equipment (such as checking the accuracy of its height adjustment rod, the performance of the hydraulic brake system, etc.) are normal. ◑◐Protect the finished product: After the concrete pavement construction is completed, timely take maintenance measures such as covering and sprinkling water, and the maintenance time is not less than 14 days. Set up warning signs to restrict the passage of vehicles and pedestrians before the concrete strength reaches the design requirements to prevent damage to the road surface.  

Shandong Vanse Machinery Technology Co., Ltd.   1. Introduction In the current construction industry, concrete laser leveling machine has become an indispensable and important equipment for ground construction with its high precision and high efficiency. This paper aims to explore the advantages of concrete laser leveling machine in material consumption, in order to provide valuable reference for improving the efficiency and reducing costs of the construction industry.   2. Principle and application field of concrete laser leveling machine The concrete laser leveling machine uses advanced laser technology to achieve efficient and precise leveling of concrete floors by precisely controlling elevation and flatness. Its application fields are wide, including large industrial plant warehouses, logistics centers, exhibition centers, airport runways, squares, municipal pavements, etc.   3. Analysis of advantages of material consumption 1. Reduce material waste: The high-precision control capability of the laser leveling machine makes ground construction more precise, effectively avoiding material waste caused by human factors in traditional construction. By precisely controlling the thickness and flatness of concrete laying, the laser leveling machine can minimize the use of excess concrete. 2. Improve use efficiency: The efficient operation capability of the laser leveling machine means a shorter construction cycle and faster construction progress. Under the same construction area, the use of laser leveling machines can significantly reduce the use of concrete, thereby reducing material costs. Taking a large logistics center as an example, after using a concrete laser leveling machine for ground construction, the material waste rate was reduced by nearly 20%, and the construction period was shortened by one third, saving a lot of costs for the project.   4. Cost saving and environmental protection significance The application of concrete laser leveling machines not only reduces material costs, but also brings significant environmental benefits. By reducing material waste, the generation of waste concrete is reduced, and the pressure on the environment is reduced. At the same time, a shorter construction period also means less energy consumption and emissions, contributing to the green development of the construction industry.   5. Analysis of adaptability to different construction stages and scenarios In different construction stages and scenarios, the concrete laser leveling machine can play its advantages of saving materials and improving efficiency. In the foundation construction stage, the laser leveling machine can ensure the flatness and strength of the ground foundation; in the surface construction stage, the laser leveling machine can achieve high-precision surface leveling to meet various ground use needs. In addition, for different application scenarios, the laser leveling machine can also be customized according to actual needs to better adapt to different construction requirements.   6. Industry status and challenges At present, concrete laser leveling machines have been widely used in the construction industry, but they still face some challenges. First, some construction workers do not have enough skills in the operation and maintenance of laser leveling machines, which affects the use of the equipment; second, there are many brands and models of laser leveling machines on the market, and the quality is uneven, which brings certain difficulties to the purchase and use. In order to promote and improve this technology, it is recommended to strengthen training and technical guidance to improve the operation level of construction personnel; at the same time, strengthen market supervision, standardize market order, and ensure product quality and after-sales service.   7. Forecast of future development trends With the continuous advancement of science and technology and the improvement of the construction industry's requirements for green, environmentally friendly and efficient construction, concrete laser leveling machines will be more widely used in the future. It is expected that in the next few years, laser leveling machines will develop in the direction of intelligence and automation, and more efficient and accurate ground construction will be achieved by introducing more advanced technologies such as machine learning and artificial intelligence. At the same time, with the continuous improvement of environmental awareness and the support and guidance of policies, concrete laser leveling machines will play a greater role in environmental protection.   8. Conclusion Concrete laser leveling machines have significant advantages in terms of material consumption, can significantly reduce material waste, improve utilization efficiency, and bring environmental benefits. Through the promotion and improvement of measures such as strengthening training and technical guidance and regulating market order, the role of concrete laser leveling machines in the construction industry will be further exerted. Looking to the future, concrete laser leveling machines will achieve greater development in the direction of intelligence and automation, providing strong support for green and efficient construction in the construction industry.