Crack Control of Superflat Floors Optimization of Cutting Timing, Depth and Spacing

As a high-precision construction equipment, the standardized operation of the concrete laser leveling machine is the key to ensuring the construction quality, safety and normal operation of the equipment. Operators must strictly follow the following specifications:   Operators must undergo professional training , be familiar with the performance, operation methods and safety precautions of the equipment, and can only work after passing the assessment. Unlicensed operation is strictly prohibited. Before operation, the construction site must be surveyed and obstacles in the site (such as stones, steel bars, wires, etc.) must be cleared to ensure that the working area is flat and unobstructed to avoid collisions during equipment operation. Check whether the power supply and water source at the construction site meet the equipment operation requirements. If a generator is used for power supply, ensure that the generator performance is stable and the voltage and frequency meet the equipment requirements. In accordance with the daily maintenance requirements in the equipment maintenance plan, conduct a comprehensive inspection of the equipment, and confirm that all parts of the equipment are normal and fault-free before starting the equipment. When starting the equipment, follow the operating steps in the equipment manual . Turn on the power switch first, and then start the engine after the equipment self-check is completed. During the startup process, the instrument indication and operating sound of the equipment should be closely observed. If there is any abnormality, the equipment should be stopped and checked immediately. When operating the equipment, the operator should concentrate and strictly follow the construction requirements and the instructions of the laser system to keep the equipment running at a constant speed, avoid sudden acceleration, deceleration or sudden turning, so as not to affect the construction flatness. The laser transmitter should be installed in a stable and safe position and properly calibrated to ensure that the laser signal is stable and accurate. The operator needs to pay attention to the signal display of the laser receiver at any time. If the signal is abnormal (such as flickering, interruption, etc.), the machine should be stopped and checked in time. The operation can only be continued after the laser system fault is eliminated. During the operation, the parameters such as the scraper height and vibration frequency of the equipment should be reasonably adjusted according to the slump and thickness of the concrete to ensure the density and flatness of the concrete. When adjusting the parameters, the machine must be stopped first, and then the equipment can be restarted after the adjustment is completed. It is strictly forbidden to repair, maintain or adjust the components while the equipment is running. If the above operations are required, the machine must be stopped first and the power supply of the equipment must be cut off to prevent safety accidents. Obvious warning signs should be set up at the construction site, and unauthorized personnel are strictly prohibited from entering the work area. Operators should wear personal protective equipment (such as safety helmets, non-slip shoes, work clothes, etc.) when working. After the operation is completed, the engine should be turned off first, and then the power switch should be turned off. Clean, inspect and maintain the equipment according to the daily maintenance requirements in the equipment maintenance plan, clean the concrete residue on the surface of the equipment, and check whether the components are damaged or loose. Park the equipment at the designated location. The parking area should be flat and solid , away from fire, water and corrosive substances. If the equipment needs to be parked for a long time, the fuel, hydraulic oil, etc. should be released, the lubrication points of the equipment should be lubricated, and protective measures for the equipment should be taken (such as covering with rainproof cloth). Clean up the debris at the construction site, organize the construction tools and materials, and ensure that the construction site is clean and orderly. Fill in the equipment operation record and construction record, and record the equipment's operating time, operation status, faults and treatment methods in detail, so as to provide a basis for subsequent equipment maintenance and construction summary. Following the above operating specifications can effectively improve the construction quality and safety of the concrete laser leveling machine, reduce equipment failures and extend the service life of the equipment. Click the below to jump immediately!!!     ARMOUR JOINT CONCRETE LASER LEVELING MACHINE LIGHT TOWER POWER TROWEL SLIPFORM MACHINE STEEL FIBER TOPPING SPREADER TRACKED MINI DUMPER  

    There are various methods for basement floor construction. Among them, the construction of diamond sand floor and diamond sand floor with curing agent is favored by many real estate projects due to its economic, wear-resistant, pressure-resistant, anti-pollution and easy-to-clean features. However, improper manufacturing processes can also lead to quality issues and potential risks. This article will respectively introduce the diamond sand wear-resistant floor from the perspective of technology and the prevention and control of common problems. 1. Diamond sand floor Compared with ordinary concrete floors, diamond sand floors have better wear resistance, compressive strength and impact resistance, and have a longer service life. However, from the perspective of microstructure, the surface of the diamond sand floor is relatively rough, and the capillary structure of concrete has a low resistance to the penetration, pollution and corrosion of substances such as acids, alkalis and oils. 2. Corundum + cured floor The construction of adding curing agent to the diamond sand floor. When the diamond sand floor is applied with a curing agent, it better makes up for the above deficiencies. Moreover, as the curing agent penetrates and forms a film, it enhances the integrity of the original surface, significantly improving its surface strength and wear resistance. After long-term use, it is obviously superior to the ordinary diamond sand floor in terms of cracking, powdering, and dusting, and is also easier to clean. It has extremely strong wear resistance, pressure resistance and impact resistance The diamond sand floor itself has excellent wear resistance. After adding a curing agent, the strength and hardness of the floor are further enhanced, and its wear resistance, pressure resistance and impact resistance are also significantly improved, and the durability of the floor is greatly enhanced. 2) Prevent sanding and dusting The main advantage of the diamond sand reinforced floor is its ability to prevent sanding and dusting. After the application of the curing agent, the surface hardness (indicated by the diameter of the indentation) and wear resistance (indicated by the length of the grinding pit) can be effectively enhanced. The surface becomes denser and has better integrity, which can effectively prevent sanding and dusting. 3) Waterproof, oil-proof and anti-corrosion The surface of a common diamond sand floor has pores that are hard to see with the naked eye. Water, oil and other corrosive liquids can seep into the interior of the floor through these holes and gaps. The most notable feature of the curing agent is its excellent sealing property, just like coating the floor with a film to prevent erosion. 1. The surface of the floor is firmly combined with the base layer, without any hollowing or sanding phenomena. 2. Surface layer quality: Uniform color, no obvious color difference, no scratches, no slag inclusions. The surface must not have cracks and hollowing is not allowed. 3. Gloss requirements: Achieve medium to high brightness, and the lamp should have a reflective effect when illuminated. 4. Joint: Uniform width, and the inside of the joint should be thoroughly cleaned. 5. The hardness of the floor should reach above 6.5 on the Mohs scale (tested by a hardness tester). 6. The trachoma rate shall not exceed 3 per square meter. 1. The strength of the concrete shall not be lower than C25. 2. The smallest possible water-cement ratio. A water-cement ratio that is too high can cause bleeding on the concrete surface and reduce the compressive strength of the concrete surface. Therefore, the water-cement ratio should be as small as possible, generally controlled below 0.5. 3. Commercial concrete should be used as much as possible. If on-site mixed concrete is used, its slump should be controlled at 1 to 3cm. The slump of commercial concrete is between 12 and 14cm. The diameter of the larger crushed stones shall not exceed 30mm. 4. When the concrete thickness is greater than 8cm, ordinary concrete should be used for pouring; when the concrete thickness is less than 8cm, fine aggregate concrete should be used for pouring. 5. Concrete should be leveled immediately after pouring, with a flatness of no more than 2mm within a 2-meter range. 6. Before the surface layer construction, the base concrete and vibration slurry should be sufficient (not less than 5mm). 7. The mud content of sand and gravel in concrete shall not exceed 2%. 8. After vibration grouting, the bleeding of the concrete should be uniform. If there are water pits, they must be removed and the surface leveled again; otherwise, the flatness of the diamond sand floor construction cannot be guaranteed. 1. Construction of diamond sand floor 1) The ground concrete is poured in sections and leveled immediately after pouring. When multiple locations are being poured simultaneously, pay attention to the construction sequence being carried out in one direction and consider the consistency of the mating surfaces. ② Concrete should be leveled with a long roller or a long straightedge after being pushed flat. Three to five hours after the concrete is poured, it should be observed that there is no bleeding on the surface and it has reached the initial setting state. 2) Use a mechanical trowel to tap the slurry in a round motion. For fine areas, use a wooden trowel to trim the edges. The main purpose is to smooth the concrete surface and reduce the floating slurry. Pay attention to troweling in the same direction as pouring. 3) Sprinkle the wear-resistant aggregate in two batches. In the first batch, evenly spread two-thirds of the wear-resistant material on the already troweled cement floor. 4) For the second time, evenly spread the remaining 1/3 of the wear-resistant material on the surface of the concrete, and use a mechanical trowel with a disc installed to work crisscross and cross at least twice. 5) Use a mechanical trowel (metal disc) to smooth it out multiple times back and forth. For the fine corners and edges, use a manual trowel in coordination with the construction. The time for the next process should be determined based on the temperature and humidity. 6) When the surface of the floor begins to harden, use a mechanical trowel with a metal blade to grind and smooth it, and repeat this operation 3 to 4 times. (Construction workers must wear soft flat shoes to avoid damaging the surface. The fine corners and edges should be polished by hand.) 7) Water curing should be carried out on the polished wear-resistant floor (mainly to prevent the evaporation of surface moisture and ensure the stable growth of the wear-resistant material's strength). The curing period is 7 days. 8) After the surface has cured for a certain period of time (5 to 6 hours after the completion of the wear-resistant material floor), use a mechanical trowel equipped with a metal blade for the final polishing and leveling. 9) Mold and compartment cutting (this can be done according to the actual situation on site and the owner's needs). Mold removal can be carried out the day after the completion of the diamond sand floor. During the operation, be careful not to damage the edge of the floor. The size of the compartments shall be determined by Party A on the third day after the completion of the diamond sand floor. 2. Application of penetrating liquid hardener (commonly known as curing agent) The original color of the diamond sand floor should be cured for more than 14 days, while the colored diamond sand floor usually needs to be cured for 28 days. Only after the color has matured can the penetrating liquid hardener be applied. The specific measures are as follows: Before construction, clean and remove debris, oil stains, paints, curing agents, etc. from the ground. If there are any pits or cracks, they should be repaired in advance with cement-based jointing mortar and maintained for 3 days. If no repair is needed, proceed with the construction directly. 2) Sprinkle water on the base layer until it is fully moistened. Do not sprinkle too much. 3) Use a 50-mesh resin grinding disc to grind the base layer, removing the floating slurry and stains on the base layer to make it free of roughness and gradually smooth. 4) After the 50-mesh grinding is completed, use a 150-mesh resin grinding disc for grinding. After grinding, use a high-power vacuum cleaner to suck up the mud and sewage on the surface of the base layer. 5) Sprinkle water on the surface of the base layer and grind it with a 300-mesh resin grinding disc (the ground should be ground evenly in a grid pattern, and the machine's pushing speed should be one step per second to grind off the remaining materials and fine scratches on the ground). After grinding, grind it with a 500-mesh grinding disc. Then, use a vacuum cleaner to suck up the wastewater and ventilate to dry the base layer. 6) After the base layer is dry, if the surface turns slightly white, apply the concrete sealant and hardener. Sprinkle the material evenly and spread it evenly with a mop. Keep the base layer surface moist for 30 minutes. If there is rapid penetration in some areas and it has dried, sprinkle the material again and use a mop to evenly moisten the base layer. 7) After 30 minutes, the surface of the concrete sealant and hardener begins to thicken. Water should be sprinkled on its surface and pushed back and forth with a long-bristled brush or floor scrubber to dilute the excess hardener and better penetrate into the base layer. After one hour, the excess material and water should be sucked dry with a vacuum cleaner to ensure that the base layer is dry for more than 12 hours. 8) After 12 hours, sprinkle water on the base surface of the completed construction material, and grind it with a 500-mesh resin grinding disc to remove the excess material. Then, grind it with a 1000-mesh grinding process. After grinding, use a vacuum cleaner to suck up the wastewater. 9) After 12 hours, the base layer has basically dried. Then, it is ground and polished with a 2000-mesh resin grinding disc to gradually give its surface a lustrous appearance. 10) For each mesh size, the grinding discs should be cross-ground 3 to 5 times in both the longitudinal and transverse directions. 11) Special treatment ① Corner and edge treatment: Large machinery can only be used for large-scale grinding. For corner and edge positions, a portable Angle grinder should be used for grinding and polishing, following the same method as for large-scale construction. When the base layer has poor strength and severe sanding, it is necessary to reinforce the base layer first, and then proceed with the normal construction process. First, use a 300-mesh resin grinding disc to remove the floating slurry on the surface of the base layer. Then, evenly sprinkle the concrete sealant and hardener to ensure it fully wets and penetrates into the base layer. After 12 hours, when the concrete sealant and hardener has cured and the strength of the base layer has improved, follow the normal process: 50-mesh grinding (water grinding) → 150-mesh grinding (water grinding) → 300-mesh grinding (water grinding) → construction materials → 12-hour drying and curing → 500-mesh grinding (water grinding) → 1000-mesh grinding (water grinding) → 2000-mesh grinding (dry grinding). The aesthetic effect of the floor cannot be achieved without meticulous control during the construction process. Besides strictly adhering to the corresponding techniques and methods, the prevention of common quality problems also requires attention. If the construction is not done properly, many problems will occur during later use. Now let's talk about the common quality problems of the diamond sand wear-resistant floor and how to prevent them. There are mainly three reasons for the color difference of corundum: 1) Material selection issues; 2) The materials were not spread in several portions, the amount of materials used was insufficient, and the thickness was uneven. 3) Maintenance issues: The use of covering with plastic film for maintenance led to uneven evaporation of ground moisture. The area where the film comes into contact with the floor is whitish, while the area where it does not touch the floor is normal in color. Preventive measures Choose a manufacturer with stable and reliable product quality and a good reputation. 2) The spreading of materials should be carried out strictly in accordance with the requirements of the briefing in several portions, with a usage of no less than 5kg/m². 3) Plastic film curing is strictly prohibited. During summer construction, water spraying curing can be adopted in several batches (with an interval of 2 to 3 hours). The allowable deviation of ground flatness is ≤2.5mm/2m in both longitudinal and transverse directions. The reasons for the deviation during construction are: 1) The template setup is out of tolerance; 2) The concrete part was not leveled in accordance with the standard. 3) The wear-resistant material is not evenly spread. Preventive measures 1) Strictly calibrate the elevation lines. Set up steel rods every 2 meters or so. The elevation of the steel rods should be the same as that on the longitudinal seam formwork. Check with a level. 2) The joints should be roughened and leveled in advance. When pouring new concrete, the levelness should be consistent with that of the already poured ground. Any low-lying areas should be replenished and filled in a timely manner. 3) Wear-resistant aggregates should be spread in two portions. The first dosage should be two-thirds of the total dosage. Ensure that the mixture falls evenly. Do not throw it forcefully to avoid the separation of aggregates and cement. After the wear-resistant material has absorbed a certain amount of moisture, it is ground and dispersed with a grinding machine and then combined with the base concrete slurry. For the second spreading, apply the remaining one-third in a direction perpendicular to that of the first spreading. When spreading, first use a straightedge or a straight scraper to measure the levelness, and adjust the uneven areas of the first spreading. After spreading, immediately smooth and polish it, and repeat the grinding machine operation at least twice. When the grinding machine is in operation, it should be carried out alternately in the longitudinal and transverse directions, evenly and orderly, to prevent material accumulation. The third time mainly involves repair treatment. For low-lying areas, materials are replenished and leveled. For corners and edges that cannot be covered by the grinding machine, manual flattening and smoothing are adopted. There are the following situations regarding ground cracks: If the initial setting time of concrete is not well controlled and the diamond sand wear-resistant aggregate is scattered when the moisture content of the concrete is relatively low, it is easy to cause cracks after the construction is completed. 2) Improper construction methods, insufficient thickness of the wear-resistant layer (corundum layer), rapid water loss (such as excessive construction environment atmosphere, etc.), resulting in volume shrinkage and linear shrinkage, causing cracks or hollowing. 3) Improper maintenance: After the completion of construction, the ground was not maintained within the prescribed time or was not adequately watered for maintenance. When the concrete temperature is relatively high, pouring cold water for curing can also cause cracks. Note: When using only the diamond sand floor, it is recommended to use a maintenance agent (oily and film-forming effect) to maintain the floor. If the corundum is reinforced (or epoxy), water curing can be directly adopted. 4) The contraction joint was cut late, and cracks appeared due to thermal expansion and contraction. Under normal circumstances, it is advisable to cut the expansion joints 24 to 48 hours after the completion of the construction of the corundum floor. If it is too late, as the hardness of the floor gradually increases, the floor is prone to "cracking" and developing cracks during the cutting process. 5) If the spacing of the division joints is too large, cracks may also occur. Preventive measures 1) Strictly control the time of the first sprinkling of materials; 2) The concrete layer and the wear-resistant layer (corundum) are constructed simultaneously. 3) The curing time shall be no less than 14 days; 4) Reasonably control the cutting time; The spacing of the division joints should generally not exceed 6m*6m. Cause of formation 1) The roughening and polishing processes are rough. 2) Inadequate maintenance and insufficient maintenance time; 3) The spreading time of wear-resistant aggregates is not well controlled. Preventive measures 1) Use a grinding machine to thoroughly smooth, compact and roughen the ground for no less than three times, and use a floor trowel to thoroughly smooth and level the ground for no less than three times. 2) The curing time shall be no less than 14 days; 3) Strictly control the spreading time of wear-resistant materials. The timing of spreading wear-resistant materials varies as needed, depending on factors such as climate, temperature, and concrete mix ratio. Spreading too early will cause the wear-resistant material to sink into the concrete and lose its effect. If it is spread too late, the concrete will gradually lose its adhesive force due to solidification, preventing the wear-resistant material from fully bonding with it. The most convenient way to determine the time for spreading wear-resistant materials is to let your feet sink about 5mm when stepping on the ground, and then you can start the first spreading work. The moisture at the edges of walls, columns, doors and formwork disappears more quickly. It is advisable to prioritize the application of water to prevent the effect from being reduced due to water loss. 1. Local damage: Clean the damaged area thoroughly, soak it in water to moisten it, then repair it with a putty made of styrene-butadiene latex mixed with water and a hardener material that has screened out the aggregates. Finally, apply the styrene-butadiene latex mixed with water emulsion. 2. Large-scale damage: According to actual needs, lines can be drawn and sawn on the damaged area, the surface layer and part of the base layer can be chiseled off, then the area can be cleaned and moistened, the plain cement slurry can be swept, concrete can be poured, and finally the surface layer of the diamond sand hardener can be applied. 3. Floor peeling: The surface of the wear-resistant diamond sand floor curls and peels. Remedial measures: Cut and chisel off the peeling area (chiseling it into a pitted surface), spray water on the pitted area to moisten it, then apply repair mortar of the same grade as the concrete and press it down to level the ground. Finally, apply a curing agent. 4. Remedial measures for cracks in diamond sand floor: 1) Cracks in areas with requirements for anti-seepage, impact resistance and wear resistance on the surface should undergo surface treatment. 2) For cracks that can affect the integrity, strength, impermeability and steel bar corrosion of the structure, grouting treatment should be carried out. 3) For cracks that endanger the safe operation of buildings, in addition to grouting treatment, other reinforcement measures should also be taken when necessary. 4) Cracks that are sensitive to temperature should be treated when the crack opening is relatively large in the later stage of the low-temperature season. 5) Flexible materials must be used to treat active cracks.   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.    

    Excessively high oil temperature in the hydraulic system of concrete power trowel is a common and highly worthy issue. Long-term high temperatures will rapidly accelerate the deterioration of hydraulic oil and the damage of components, leading to a decline in equipment efficiency or even paralysis. The following are the main causes of excessively high oil temperature in the hydraulic system. You can investigate them from simple to complex Low oil level: Insufficient oil volume causes the oil pump to be sucked empty, resulting in insufficient circulating oil volume. The oil rubs vigorously inside the pump and heats up quickly, while the cooling effect also deteriorates. Excessively high oil level: There is insufficient space for the oil in the fuel tank, making it difficult for foam and air to separate. The mixture of oil and air will accelerate oxidation and temperature rise. Improper oil viscosity: Hydraulic oil with a viscosity that is either too high or too low was used. The viscosity is too high, the internal frictional resistance is large, and more heat is generated. When the viscosity is too low, internal leakage increases, the efficiency of the oil pump decreases, and energy is converted into heat. Oxidation and deterioration of the oil: The hydraulic oil has been in use for too long and has been severely oxidized and contaminated. Deteriorated oil has a decline in lubrication performance and anti-wear performance, which will lead to increased friction and temperature rise among various components. This is one of the most common reasons. The relief valve is the safety valve of the system. If the set pressure is too high or the valve core is stuck in the normally open or normally closed position, it will cause the hydraulic oil to continuously flow back to the oil tank through the relief valve under high pressure. This "pressure relief" process will convert a large amount of hydraulic energy into heat energy, causing the oil temperature to rise rapidly. When the internal components of the pump (such as plungers, gears, and blades) wear out, internal leakage will be very severe. High-pressure oil leaked inside the pump into the low-pressure area, generating a large amount of heat. This is usually accompanied by the phenomenon of overall machine weakness and a decline in work efficiency. The valve core of the directional control valve that controls the lifting and Angle of the polishing disc is worn, and the seal fails, causing high-pressure oil to flow and leak inside the valve, generating heat. Air-cooled cooler: The heat dissipation fins are severely blocked by dust, oil sludge and cement powder, resulting in a sharp decline in heat dissipation efficiency. Insufficient rotational speed of the cooling fan or its complete stop can also cause the same problem. Water-cooled coolers: Scaling or blockage of impurities in the internal waterways affects the heat exchange efficiency. The motor driving the fan is damaged, the circuit malfunctions, or the drive belt slips or breaks, causing the fan not to rotate or the rotational speed to be too low, and thus unable to provide sufficient air volume to the cooler. In pursuit of efficiency, operators keep the equipment running at maximum power or under overload conditions continuously, maintaining a high pressure in the hydraulic system, which naturally generates a large amount of heat. Construction is carried out in the hot summer when the ambient temperature is already high. If the equipment is still operating in an environment with poor ventilation, heat will be even more difficult to dissipate. The return oil pipeline is not unobstructed, resulting in excessive back pressure of the return oil. When the oil returns to the oil tank, the resistance is large and additional heat will also be generated. When it is found that the hydraulic oil temperature of the power trowel machine is too high, the following sequence of "from outside to inside, from simple to complex" can be followed for troubleshooting: Stop the machine and check whether the hydraulic oil level is within the standard range. Observe the color and condition of the hydraulic oil to see if it turns black, has excessive foam or emulsification. Visually inspect whether the fins of the cooler are clogged with dirt. Listen/check if the cooling fan is rotating normally. Touch the hydraulic pipeline with your hand to feel which part has an abnormally high temperature, which helps to locate the fault point. Listen for any abnormal and persistent noises from the hydraulic pump and the relief valve. Use a pressure gauge to test whether the working pressure of the system and the set pressure of the relief valve are normal. Check the volumetric efficiency of the hydraulic pump (that is, determine whether the internal leakage is severe). Clean or replace the cooler. Check and clean the return oil filter. The key point is that excessively high oil temperature in a hydraulic system is rarely caused by a single factor; it is usually the result of the combined effect of multiple factors. Regular maintenance (replacing hydraulic oil and filter elements, cleaning the cooler) is the key to preventing such problems. Once high temperatures occur, they must be dealt with promptly; otherwise, it will cause irreversible and serious damage to the hydraulic system. 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.