Concrete finishing equipment for high FF scores

  In order to ensure the construction quality of concrete floor, more and more construction units now choose to use precision laser leveling machines to lay concrete floor. However, in the actual construction process, due to the inadequate cooperation of some enterprises in construction, or not strictly following the regulations to operate correctly, the quality of concrete floor construction is sometimes poor. In order to avoid such a situation from happening again, our company has made a detailed description of some matters related to the construction cooperation during the construction of the laser leveling machine. We hope that the relevant construction personnel will keep it in mind. ❖Wall line laying and leveling: Since the laser leveling machine cannot touch the wall, manual leveling is required within 200mm from the wall, so it is necessary to lay out the line as a reference for manual leveling. At the same time, set 2 to 3 leveling base points (ground design elevation, i.e. ±0.0) that are not disturbed during the construction period for the laser leveling machine to use at one time, and require good mutual visibility. Leveling point accuracy ±1mm. ❖Set templates (steel templates, the position is determined according to design requirements) around the columns to form separation seams. The elevation of the top surface of the template should be controlled within +0mm and -2mm to avoid affecting the flatness of the joints. ❖Installing construction joint formwork: Install the construction joint template along the range to be poured on the day (steel template is recommended), and the template should reserve holes with a spacing of 300mm for the insertion of the force transmission rod. The elevation of the top surface of the template should be controlled within +0mm and -2mm to avoid large deviations in the flatness of the joints of different bins.   ❖Laser transmitter installation: It is planned to be installed on the column. The specific location should be set at a better location according to the amount of paving on the day. If it cannot be installed on the column, it should be installed on a special tripod.   ❖In order to ensure the quality of concrete floor paving, each group needs to arrange 10 to 12 workers to cooperate to flatten the surface of the concrete spread on the ground so that the pile is slightly higher than the design elevation (about 20 to 30mm). At the same time, for the parts near the wall, exposed pipelines and the surrounding of the formwork, two workers are arranged to manually smooth the concrete material about 20~30cm away from the wall (formwork) (using a 2m scraper with an iron trowel). The workers responsible for smoothing the edges must be trained and skilled plasterers. These workers must obey the command and follow the arrangement to ensure the quality of construction.   ❖ Since the thickness of the concrete reaches 200mm, and because of the installation of steel mesh, in order to ensure the compaction of the concrete, this project needs to arrange a vibrating rod to cooperate with the vibration. At the same time, in order to ensure that the protective layer of the steel mesh reaches the design requirement of thickness (70mm), it is necessary to arrange for manual lifting of the steel mesh and pad the support block in the range to be paved in advance.   ❖ The width of the concrete material paved on the platform each time is required to be no more than 5m, and the length is based on the formwork boundary. The construction direction is from left to right (along the short side direction) and from front to back (along the long side direction). The recommended daily paving volume is 1200~1500㎡. Calculated based on 12 hours of working time per day, the feed rate is required to be 30 to 40m³.   ❖Others: To ensure the flatness of the ground, special attention should be paid during the construction of the laser leveling machine: the slump of the concrete delivered to the platform each time must be consistent; the concrete feed rate must reach 40m. per hour or more, and the initial setting time of each batch of concrete must be consistent; the template elevation must be accurate and cannot be disturbed during construction; environmental coordination. The newly constructed concrete floor cannot be exposed to sunlight, wind, rain and other environments that are unfavorable to the curing of concrete.   Special reminder: In order to make the laser leveling machine give full play to its inherent functions and ensure the construction quality and efficiency of the concrete floor, in addition to mastering the above-mentioned construction coordination precautions, there are many details that need to be paid attention to. Please look forward to the subsequent updates and sharing of this site.

    Concrete cracking is a very common and complex problem. Below, I will explain in detail the main causes of concrete cracking, how to identify different types of cracks, and the corresponding treatment and prevention measures. Concrete cracking can be categorized into two main types: early cracking and late cracking. Plastic settlement cracking: Cause: After pouring, concrete is still in a plastic state. Aggregates (gravel, sand) sink, while the cement slurry rises (called "bleeding"). When this settling is hindered by rebar, formwork, or larger aggregate, cracks develop on the concrete surface along the direction of the rebar. Characteristics: Surface cracks typically occur along the direction of the rebar. Plastic shrinkage cracks: Cause: Before the concrete finally sets, surface moisture evaporates faster than the rate at which moisture seeps upward, causing the surface to shrink rapidly while the concrete inside remains plastic, resulting in irregular, network-like cracks and crazing. Causes: High temperatures, strong winds, low humidity, and inadequate curing. Temperature stress cracks (caused by hydration heat): Cause: After pouring large volumes of concrete (such as foundation slabs and beams), the cement hydration reaction releases a large amount of heat, causing the internal temperature to rise sharply (up to 50-70°C). This rapid heat dissipation from the surface creates a significant temperature difference between the inside and outside, generating thermal stress. When the tensile stress exceeds the concrete's early tensile strength, cracking occurs. Characteristics: Cracks are deep and wide, often occurring at cross-sectional changes or in the middle of the structure. Construction process issues: Excessive water addition: Adding water arbitrarily for ease of construction increases the water-cement ratio, severely reducing concrete strength. Improper vibration: Excessive vibration causes aggregate sinking and water seepage; inadequate vibration results in loose concrete. Failure to apply a secondary trowel to the surface before initial setting prevents the closure of early plastic cracks. Drying shrinkage cracks: Cause: After concrete hardens, excess moisture gradually evaporates, causing volumetric shrinkage. When this shrinkage is constrained by external forces (such as foundations and columns) or internal forces (such as rebar), tensile stresses are generated, leading to cracking. This is the most common type of crack. Characteristics: Cracks are shallow and fine, often forming an irregular network or parallel lines. Load-induced cracking: Cause: The loads borne by the structure (such as deadweight or operational load) exceed its design capacity. Characteristics: The cracks are relatively wide, and their direction is related to the nature of the load (e.g., vertical cracks in the middle of the beam bottom are bending cracks, while diagonal cracks at the ends of the beam are shear cracks). These cracks require special attention, as they may affect structural safety. Uneven foundation settlement: Cause: Uneven foundation soil quality, softening due to waterlogging, or excessive loads lead to uneven foundation settlement, resulting in additional stress within the structure and cracking. Characteristics: Cracks are often penetrating, with their direction related to settlement. Alkali-aggregate reaction: Cause: The alkali in the cement reacts chemically with the active silica in the aggregate, forming an expansive gel. This gel expands in volume after absorbing water, causing concrete cracking. Characteristics: A map-like or network-like pattern of cracks with silicone gel seeping out of the surface. Rebar Corrosion Cracks: Cause: Insufficient concrete cover or carbonization reaching the rebar surface. In the presence of water and oxygen, the rebar rusts, causing the rust to expand several times in volume, cracking the concrete. Characteristics: Cracks run along the rebar, later accompanied by brown rust.   Before treating cracks, it is necessary to first analyze and determine the crack type, width, depth, stability, and impact on structural safety. Treatment methods are primarily categorized as surface sealing and internal reinforcement. Surface Sealing Method (Suitable for Micro-Cracks <0.2mm) Brushing method: Apply a cement-based penetrating crystallizing waterproofing material, epoxy resin, or polymer-modified cement slurry directly to the crack surface to seal the crack and prevent the intrusion of moisture and harmful substances. Grooving and filling method (suitable for static cracks 0.2-0.5mm wide): Steps: Chisel a "V" or "U"-shaped groove along the crack → Clean thoroughly → Apply a primer → Fill with epoxy resin mortar, polymer cement mortar, or a specialized sealant. Low-pressure grouting (injection method) (suitable for cracks 0.1-1.5mm wide) Steps: Surface cleaning: Clean the area around the crack. Inserting grouting nozzles: Attach grouting nozzles at regular intervals along the crack. Crack sealing: Use sealant to seal the crack surface to prevent grout from leaking. Pressure grouting: Use a low-pressure syringe to inject epoxy or polyurethane grout into the crack from a grouting nozzle until grout is released from the adjacent grouting nozzle. Surface finishing: After the grout has solidified, remove the grouting nozzle and smooth the surface. Structural reinforcement method (suitable for wide cracks that affect bearing capacity) Bonding fiber composite materials (carbon fiber cloth/plate): High-strength carbon fiber cloth is bonded to the surface of the cracked area, utilizing its high tensile strength to share the load. Bonding steel plates: Steel plates are bonded to the concrete surface using structural adhesive to increase structural rigidity. Enlarging the cross-section: A layer of concrete is wrapped around the existing component to increase its cross-sectional dimensions and reinforcement. Prestressing: Prestressed tendons are used to actively apply pressure to the structure, offsetting some of the tensile stress. Important: For cracks caused by uneven foundation settlement, alkali-aggregate reaction, etc., the root cause must be addressed first (such as strengthening the foundation) before crack repair.   Prevention is far better than cure. Strict control should be applied to all aspects of the process, including materials, design, construction, and maintenance. Materials: Optimize mix proportions, reduce the water-cement ratio, and use high-efficiency water reducers. Use well-graded aggregates and reduce cement dosage to reduce hydration heat and shrinkage. Use low-heat or medium-heat cement for large-volume concrete. Design aspects: Ensure proper reinforcement placement and add structural reinforcement (such as crack-resistant steel mesh) in areas prone to cracking (such as around holes and at cross-section changes). Properly establish expansion joints and post-cast joints (for extra-long structures). Ensure sufficient concrete cover thickness. Construction: The addition of water on site is strictly prohibited. Strictly control the pouring and vibration processes to ensure uniform compaction and avoid over-vibration and missed vibration. Implement cooling measures (such as water-cooling aggregates) during hot seasons and insulation measures in winter. Perform secondary troweling and compaction promptly to eliminate plastic cracks. Maintenance (critical!): Early Curing: Immediately cover with plastic sheeting or a curing blanket after pouring to prevent rapid evaporation. Sufficient Moisturization: After final set, begin regular watering or use a curing agent to keep the concrete surface moist for at least 7-14 days. Insulation Curing: For large concrete volumes, monitor the temperature difference between inside and outside, implement insulation and moisture curing, and maintain the temperature difference within 25°C.   Crack Types Main causes: Treatment Focus Prevention of core problems Plastic Shrinkage/Settlement Cracks Early water loss and impeded settlement Surface Sealing Timely screeding and covering to retain moisture Temperature Cracks Heat of hydration and large temperature difference between inside and outside Grouting Reinforcement Use low-heat cement, cooling, and thermal insulation Desiccation Shrinkage Cracks Later water evaporation and shrinkage Surface Sealing/Grouting Reduce the water-cement ratio and enhance moisture retention Load/Settlement Cracks Overloading and foundation problems Structural Reinforcement + Root Cause Treatment Reasonable design to ensure construction quality When you encounter concrete cracks, don't blindly address them. First, determine their nature and severity. For cracks that are wide, persistent, or potentially impacting structural safety, consult a professional structural engineer or testing company for evaluation. Based on the results, develop a sound treatment plan.   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.      

In the field of construction, concrete laser levelers (concrete laser leveling machines or concrete laser levelers) have become key equipment for improving the efficiency and quality of concrete construction. With the continuous advancement of global infrastructure construction and the growing demand for high-precision construction in the construction industry, the market size of concrete laser levelers continues to expand. According to market research reports, the global market size of concrete laser levelers is expected to reach US$1.76 billion in 2025, with an annual growth rate of approximately 11.4%. In order to give full play to the effectiveness of concrete laser levelers and extend their service life, it is crucial to optimize the use environment. Before the operation of the concrete laser leveler, it is crucial to ensure that the construction site is clean and free of debris. Stones, wood, metal scraps and other debris in the site will not only hinder the normal operation of the equipment, but may also damage key components of the equipment, such as the leveling work head and walking tires. For example, if sharp stones remaining in the site are drawn into the walking mechanism of the laser leveler, it may cause the tires to be scratched and deviate, affecting the stability and walking accuracy of the equipment. At the same time, the construction site should be initially leveled so that the ground slope and undulation are within the range that the equipment can adapt to. Generally speaking, the concrete laser leveling machine is suitable for slopes within a certain range. If the site slope exceeds the specified range, it may cause the center of gravity of the equipment to be unstable, affect the leveling accuracy, and even cause safety accidents. In order to ensure the safety of construction personnel and equipment, a clear safety warning area should be set up around the concrete laser leveling machine operation area. Set up warning signs, such as "Construction site, no entry for idle people" and "Pay attention to equipment operation", and set up warning tapes to clearly divide the equipment operation range. Especially in construction sites where multiple types of work are cross-operated, prevent other personnel or equipment from mistakenly entering the operation path of the laser leveling machine to avoid collision accidents. For example, in the construction of basement floors in large commercial complexes, due to the complex construction space and frequent exchanges between personnel and equipment, a clear safety warning area can effectively reduce the probability of accidents. At the same time, arrange special personnel to be responsible for safety inspections to ensure the effectiveness of the warning area and promptly dissuade personnel and equipment from entering illegally. Response to high temperature environment: In high temperature environment, the engine of the concrete laser leveler is prone to overheating, resulting in power reduction and increased wear of parts. When the ambient temperature exceeds 35℃, the load of the engine cooling system increases significantly. At this time, the maintenance of the engine cooling system should be strengthened, and the coolant level should be checked before daily operation. If it is insufficient, add coolant that meets the specifications in time. Clean the dust and debris on the surface of the radiator regularly to ensure that the heat dissipation air duct is unobstructed. Compressed air or high-pressure water gun (pay attention to moderate water pressure to avoid damage to the radiator fins) can be used for cleaning. For example, when constructing in an open-air parking lot with high temperature in summer, if the engine temperature is found to be too high, the equipment should be immediately moved to a cool place to shut down and cool down, and never force operation under high temperature. At the same time, consider installing a sunshade for the equipment to reduce the impact of direct sunlight on the equipment and reduce heat accumulation in the engine compartment. Response to low temperature environment: In a low temperature environment (such as an ambient temperature below 5℃), the viscosity of the lubricating oil of the concrete laser leveler increases and the fluidity becomes poor, which will make it difficult to start the equipment and increase the wear of various moving parts. Therefore, before construction in a low-temperature environment, lubricating oil and hydraulic oil suitable for low-temperature working conditions should be replaced, such as using low-freezing point engine oil and hydraulic oil. Before starting the equipment, a preheating device can be used to preheat the engine, such as an electric heating water jacket, a fuel heater, etc., to improve the starting performance of the engine. At the same time, the battery of the equipment should be kept warm and protected, and a battery warming sleeve can be installed to prevent the battery from degrading due to low temperature and affecting the start of the equipment. For example, in the construction of industrial plant floors in the northern winter, taking good low-temperature protection measures for the equipment can ensure the normal operation of the concrete laser leveling machine and improve construction efficiency. High humidity environment protection: High humidity environment can easily cause the metal parts of the concrete laser leveling machine to rust and corrode, especially when constructing in coastal areas or rainy seasons. In order to cope with high humidity environments, the equipment should be parked in a dry place, and try to choose indoors or in a place with a rain shelter. If it is unavoidable to work in a humid environment, anti-rust oil can be applied to the surface of the equipment, especially parts that are prone to rust, such as the frame, chassis, and walking mechanism. Check the electrical circuits regularly to prevent short circuits caused by moisture. Use an insulation resistance tester to detect the insulation performance of the electrical circuits and deal with problems in a timely manner. For the battery of the equipment, keep it clean and dry, check the electrolyte level and density regularly, and add distilled water in time to ensure good battery performance. For example, if the laser leveling machine used for a long time in a high humidity environment does not pay attention to rust prevention, the frame may rust and reduce strength in a short time, affecting the safety and service life of the equipment. Moisture-proof measures: When the concrete laser leveling machine is idle, effective moisture-proof measures should be taken. Desiccant, such as quicklime, silica gel desiccant, etc., can be placed at the equipment parking place to absorb moisture in the surrounding air and reduce humidity. For key components of the equipment, such as laser transmitting and receiving devices, electrical control cabinets, etc., moisture-proof covers can be used for protection to prevent moisture intrusion. During construction in the rainy season, if the equipment is exposed to rain for a long time, the moisture on the surface of the equipment should be wiped dry with a dry cloth in time after the operation, and the equipment should be fully inspected to ensure that no moisture enters the equipment. For example, in the construction site in the rainy season in the south, doing a good job of moisture-proofing the equipment can effectively reduce equipment failures caused by moisture. Concrete laser leveling machines usually operate at construction sites with a lot of dust, and a large amount of dust can damage the key components of the equipment. To reduce the impact of dust, a high-efficiency air filter can be installed at the air inlet of the equipment to filter dust particles in the air and ensure that the air entering the engine and hydraulic system is clean. Clean the air filter regularly. Depending on the dust concentration at the construction site, generally clean or replace the filter element every 50-100 hours of work. At the same time, protect the laser transmitting and receiving devices of the equipment to prevent dust from adhering to the lens and affecting the transmission of the laser signal. A dust cover can be installed or the lens can be wiped regularly with a clean soft cloth. In addition, when the equipment is operating, try to avoid staying in areas with severe dust for a long time to reduce the erosion of dust on the equipment. For example, in the floor construction of a cement plant, the dust concentration is extremely high. Strengthening dust protection measures can effectively extend the service life of the concrete laser leveling machine. For electric concrete laser levelers, stable power supply is the key to the normal operation of the equipment. Before connecting to the power supply, check whether the power supply voltage meets the equipment requirements. The rated voltage fluctuation range of general equipment should be controlled within ±10%. If the voltage is too high or too low, it will affect the performance of the equipment motor and even burn the motor. You can use a voltmeter to regularly check the power supply voltage to ensure that the voltage is stable. At the same time, ensure that the capacity of the power supply line is sufficient to avoid safety accidents caused by voltage drop or line heating due to line overload. For temporary electricity use at the construction site, wiring should be carried out in accordance with relevant specifications, using a three-phase five-wire system and equipped with a leakage protector to ensure safe electricity use. For example, in the indoor floor construction of large shopping malls, if the power supply is unstable, the motor speed of the laser leveler may be uneven, affecting the leveling accuracy. Fuel-fired concrete laser levelers need to use high-quality fuel to ensure the normal operation of the engine. You should choose fuel that meets the equipment's required grades. For example, diesel engines generally use 0 or -10 diesel, and lower grades of diesel should be used in low temperature environments. Poor-quality fuel may contain impurities and moisture, which can cause the engine's fuel injectors to become clogged, combustion to be incomplete, reduce engine power, increase fuel consumption, and even damage the engine. Purchase fuel from regular gas stations and clean the fuel tank regularly to prevent impurities precipitated at the bottom of the tank from entering the fuel system. At the same time, before adding fuel to the equipment, you can use a fuel filter for secondary filtration to ensure fuel cleanliness. For example, in highway construction in remote areas, if non-standard fuel is used, the engine of the concrete laser leveler may frequently malfunction, affecting the construction progress. If conditions permit, the concrete laser leveler should be stored indoors as much as possible. Indoor storage can effectively prevent the equipment from being eroded by natural factors such as wind, sun, and rain, and reduce the risk of paint damage on the surface of the equipment and rust on metal parts. The indoor storage environment should be kept dry, well ventilated, and at a suitable temperature. The general temperature should be controlled between 5℃ – 35℃, and the relative humidity should be controlled between 40% – 70%. When storing indoors, the equipment can be parked on a dedicated bracket to avoid direct contact between the equipment and the ground, and to prevent the bottom parts from getting damp and rusting. At the same time, the equipment should be inspected and maintained regularly, such as checking the lubrication of the equipment, the connection of the electrical circuits, etc., to ensure that the equipment is in good standby condition. If the concrete laser leveling machine can only be stored outdoors, strict protective measures must be taken. First, build a rain shelter to ensure that the equipment is not directly exposed to rain. The material of the rain shelter should have good waterproof and sun-proof properties, such as color steel plates, canvas, etc. Cover the surface of the equipment with sun-proof and waterproof tarpaulin, and fix it firmly with ropes to prevent the tarpaulin from being blown away by the wind. At the same time, additional protection should be provided for key parts of the equipment, such as the engine, electrical control cabinet, laser transmitting and receiving devices, etc., which can be wrapped with a dedicated protective cover. During outdoor storage, the equipment should be inspected regularly, dust and debris on the surface of the equipment should be cleaned, and problems should be dealt with promptly. For example, in long-term outdoor construction sites, good storage protection of the equipment can effectively extend the service life of the equipment and reduce the occurrence of equipment failures. Click the below to jump immediately!!!     ARMOUR JOINT CONCRETE LEVELING MACHINE LIGHT TOWER POWER TROWEL SLIPFORM MACHINE STEEL FIBER TOPPING SPREADER TRACKED MINI DUMPER