What are the application scenarios of concrete laser leveling machine?

Even the best laser levelers will likely age or even become scrapped as they age or are used more and more, or due to improper maintenance, untimely after-sales service from the manufacturer, and other factors. Faced with such machines, many construction units usually abandon them, not knowing that many manufacturers have launched activities such as "recycling old machines at high prices and exchanging old for new". For scrapped laser levelers, customers can participate in the above activities in the following ways. ● Sell the idle laser levelers directly, and the manufacturers will recycle them at a high price For the idle and aging scrapped laser levelers in your hands, it may be due to the large amount of engineering, long service life, old software system, or replacement with a newer or larger laser leveler, or the transformation of the industry and no longer direct concrete paving construction, and no longer intend to reuse the original idle laser levelers. As long as the laser system is intact, it can be sold directly to manufacturers with "old for new" activities. They will definitely conduct professional evaluation of your equipment and help you realize cash. ● Repair and refurbish the laser leveler in your hands, and the manufacturer provides you with remanufacturing services At the end of the year, many construction units will sort out the construction equipment in their hands after they are idle, in preparation for the construction next year. They hope to reuse the idle and aging laser levelers in their hands, but they often do not have professional skills and cannot repair them. The cost of purchasing a new machine is too high. At this time, you can contact the manufacturer of "old machine recycling at a high price" to remanufacture your laser leveler. In addition to solving the problems of your current equipment and replacing damaged parts, you can also use your own technical advantages to upgrade and transform your equipment software system to "turn waste into treasure". ● Replace the scrapped equipment in your hands with a new machine, and the manufacturer provides "old for new" service As a precision equipment, some friends ignored the after-sales service, brand technology, product quality and other factors when they bought the laser leveler. They often bought low-quality products without after-sales service because they only wanted to be "cheap" for a while. Although there are concrete paving projects in hand, they cannot be used normally due to problems with the equipment or the manufacturer has not provided systematic and professional training to the operator. I want to buy a product with higher intelligence, guaranteed service and excellent quality, but due to financial pressure, I can't buy it for the time being. In order to meet the needs of such friends, we carry out the "old for new" service, conduct replacement evaluation, and replace the new intelligent laser leveling machine after making up the price difference. After the laser leveling machine has been used for a long time, it will inevitably be idle or scrapped, but as long as we handle it reasonably, we can successfully turn waste into treasure and obtain unexpected benefits. Therefore, if the laser leveling machine in your hand has become old or scrapped, do not discard it at will. You can contact the manufacturer with recycling activities to let the equipment "turn waste into treasure".

The operating procedures and precautions for the concrete laser leveling are as follows: 1. Operation process Preparation before construction Before carrying out concrete laser leveling machine construction, corresponding preparations need to be made. First, check that all parts of the leveler are intact and make sure the machine is in good working order. Secondly, determine the materials and tools required for construction, such as concrete, water, cement and other materials, as well as mixers, transport trucks, vibrators and other tools. Finally, determine the specific location and scope of the construction, and measure and stake out according to the design requirements. Concrete ingredients According to the construction requirements, the concrete ingredients are mixed together in a certain proportion. During the batching process, attention needs to be paid to the quality and proportion of materials to ensure that the strength and stability of the concrete meet the requirements. At the same time, attention needs to be paid to the mixing time and mixing speed to ensure that the concrete is fully mixed evenly. Laying steel mesh Before laying the steel mesh, the specifications, quantity and location of the steel bars need to be determined, and processed and tied according to the design requirements. When laying the steel mesh, attention needs to be paid to the flatness and stability of the steel mesh to ensure that it can withstand the weight of the concrete and the external forces during the construction process. Laser leveling machine construction Before the construction of the laser leveling machine, various parameters of the machine need to be adjusted, such as scraper height, vibration frequency, leveling head angle, etc. During the construction process, it is necessary to control the traveling speed and direction of the laser leveling to ensure that the leveling can evenly scrape the concrete. At the same time, it is necessary to observe the flatness and thickness of the concrete and adjust the parameters and operating methods of the leveler in a timely manner. Follow-up processing After the laser leveling machine construction is completed, follow-up processing is required. First, trim and clean the completed concrete surface to remove surface impurities and uneven parts. Secondly, maintain and protect the concrete surface, such as covering it with plastic film or spraying curing agent. Finally, the waste during the construction process is cleaned and processed to ensure the cleanliness and environmental protection of the construction site. 2. Precautions Operators must undergo professional training and qualification before they can operate the concrete laser leveling. Unlicensed operation is strictly prohibited. Safety warning signs must be set up at the construction site, and full-time safety officers must be assigned to be responsible for on-site safety management. Operators must understand the principles, structure, performance and operation methods of concrete laser levelings, and master the necessary maintenance knowledge. When using a concrete laser leveling, you must wear labor protection supplies, such as safety helmets, gloves, work clothes, etc. Before using the concrete laser leveling machine, you must check whether all parts of the machine are intact. If there is any damage or failure, it must be repaired or replaced in time. When using a concrete laser leveling, the construction must be carried out in accordance with the design requirements, and the construction parameters or operating methods must not be changed at will. When using the concrete laser leveling machine, the construction site must be kept clean and standardized, and debris or garbage must not be piled up randomly. When using the concrete laser leveling machine, you must pay attention to the safe use of electricity and do not pull cables or wires at will. When using a concrete laser leveling machine, maintenance must be carried out in accordance with the machine maintenance requirements, such as regular oil replacement, machine body cleaning, etc. When using a concrete laser leveling machine, you must pay attention to the care and maintenance of the machine, such as regularly checking the lubricating oil, cleaning the air filter, etc. When using the concrete laser leveling machine, care must be taken to avoid collision or damage to the machine. If the machine is found to have abnormal noise or vibration, it should be stopped in time for inspection. When using a concrete laser leveling machine, care must be taken to protect the machine's electronic components and sensors and other sensitive components. If damage or failure is found, it should be repaired or replaced in time. When using a concrete laser leveling, attention must be paid to controlling the construction temperature and humidity. If the temperature is too high or too low, it will affect the strength and quality of the concrete. When using a concrete laser leveling, attention must be paid to controlling the slump of the concrete to ensure good fluidity and easy construction of the concrete. When using a concrete laser leveling, attention must be paid to controlling the mix ratio and quality stability of the concrete to ensure that the construction quality meets the design requirements. When using a concrete laser leveling, attention must be paid to controlling the energy consumption and usage costs of the equipment to reduce construction costs and improve economic benefits.  

    In the field of construction engineering, leakage has always been a core threat to structural safety and functional experience – moisture in basements leads to moldy decoration, roof seepage erodes steel bars, and wall leakage affects living comfort, and it will also accelerate the carbonation of concrete and the aging of the structure. Traditional waterproofing techniques (membranes, coatings) rely on external additional layers, which are prone to failure due to material aging, construction hollowing, and temperature difference deformation. Although ordinary self-waterproofing structures enhance their impermeability by optimizing the density of concrete, they are difficult to deal with micro-cracks caused by temperature stress and load fluctuations in the later stage. Self-healing structural self-waterproofing technology, with its innovative mechanism of "actively repairing micro-cracks", has achieved a leap from "passive anti-seepage" to "active self-healing", and has become a core waterproofing solution for high-end buildings and special projects. This article, based on the technical practices of the three major brands, Pengneichuan (Penetron), Sika, and liwei, systematically analyzes the technical key points, brand differentiation solutions, and engineering application norms of self-healing structure self-waterproofing. 1. Concept: Self-healing structural self-waterproofing is based on the "material improvement – construction control – structure optimization" of ordinary structural self-waterproofing. By adding self-healing functional components (such as active crystallization agents, capsule repair agents, microbial agents, etc.), after the concrete generates micro-cracks with a width of ≤0.3mm, it can be triggered by moisture, air or chemical conditions. A technical system for independently completing crack filling and restoring impermeability performance. 2. Core logic: "Hazard Prediction – Proactive Response – Performance Reset" (1) Hidden danger prediction: During the service of buildings, due to temperature changes (thermal expansion and contraction), load fluctuations (dynamic load impact), and dry-wet cycles, 0.1-0.3mm micro-cracks are bound to occur (the crack resistance of ordinary concrete is limited, and such cracks are hard to avoid), and cracks are the main channels for water seepage. (2) Active response: The "self-healing components" pre-installed inside the concrete (such as Pengnei Chuan's active crystalline particles and Sika's capsule repair agent) are activated when cracks occur – either reacting with water to form a gel, or breaking to release the repair agent, or being metabolized by microorganisms to produce crystals; (3) Performance reset: Self-healing products fill the cracks and re-form a dense impermeable barrier, restoring the original impermeability of the concrete. This technology is particularly suitable for scenarios with extremely high requirements for waterproofing reliability and durability, such as subway tunnels, nuclear power plants, water conservancy projects, and basements of super high-rise buildings. The implementation of self-healing structure self-waterproofing should revolve around "self-healing material selection – construction adaptation – performance verification", and the core technical links should comply with the "Technical Code for Self-Healing of Concrete Structures" (CECS 378-2021) and relevant national standards: The performance key of self-healing waterproof concrete lies in the "self-healing functional components". Currently, the mainstream technical routes are divided into three categories, and the appropriate solution should be selected according to the engineering scenario: Self-healing technology route Internal admixture self-healing agent Microbial self-healing Fiber-reinforced self-healing In addition, the base concrete should meet the following requirements: strength grade ≥C35, impermeability grade ≥P8, and the admixtures should be Grade I fly ash (with a content of 15%-20%) or mineral powder (with a content of 25%-30%) to enhance the density of the concrete and the compatibility with self-healing components. The construction of self-healing concrete should, on the basis of the self-waterproofing of ordinary structures, strengthen the "uniformity of self-healing components" and "crack induction control", with key control points: (1) Mixing and pouring: For capsule-type self-healing agents, the "post-mixing method" (adding them in the last 30 seconds of concrete mixing) should be adopted to prevent capsule rupture. Microbial agents need to be added simultaneously with the aggregates, and the stirring time should be extended to 120-150 seconds to ensure the uniform distribution of the agents. The thickness of the layered pouring should be no more than 400mm, and the spacing of the vibration rods should be no more than 350mm to prevent the aggregation or damage of self-healing components. (2) Curing and crack induction: Within 24 hours after pouring, adopt "water storage + film covering" curing (humidity ≥90%, temperature ≥15℃), and extend the curing period to 21 days – sufficient moisture can activate self-healing components (such as microbial metabolism, expansive agent reaction); For large-volume concrete, "induction joints" (with a spacing of 8-10m and a depth of 50-80mm) should be reserved on the surface to guide the formation of cracks at the preset positions, facilitating the concentrated repair of self-healing components. (3) Construction joint treatment: In addition to the conventional waterstop steel plate, a "self-healing interface agent" (such as microbial agent slurry, with a application rate of 0.3kg/㎡) should be applied to the interface of the construction joint to enhance the self-healing ability of the new and old concrete bonding surface and prevent interface leakage. (1) Moisture guidance structure: Set up "micro-seepage water channels" (10-15mm in width and 0.5% in slope) on the basement floor and roof slabs. When micro-cracks occur, guide the moisture to contact the self-healing components, accelerating the repair reaction. (2) Monitoring and supplementary repair nodes: Pre-embed "crack monitoring sensors" (with an accuracy of 0.01mm) at key locations such as tunnels and water pools to monitor the crack width in real time. If the crack exceeds the self-healing range (> 0.3mm), self-healing slurry (such as microbial agent slurry) can be injected through the pre-embedded grouting pipe to achieve artificial auxiliary repair. (3) Node reinforcement: The part where the pipe passes through the wall plate adopts "self-healing waterproof sleeve" (the inner wall of the sleeve is coated with permeable crystalline paint, and the gap is filled with expansive self-healing sealant), providing dual protection for the impermeability of the node. From the three dimensions of anti-seepage, repair and lifespan, the self-waterproofing advantages of the structure are significant. The specific comparison is as follows: Comparison dimension Traditional waterproofing (membrane/coating Ordinary structure self-waterproofing Self-healing structure is self-waterproof Crack treatment capacity The crack cannot be repaired and leakage is prone to occur at the crack Relying on the inherent density of concrete, micro-cracks are prone to develop into leakage channels Actively repair micro-cracks of ≤0.3mm to prevent leakage from spreading Service life 5 to 10 years (material aging) 30 to 40 years (cumulative failure due to micro-cracks) Have the same lifespan as the building (≥50 years, with continuous self-healing function) Environmental adaptability It is prone to aging at high or low temperatures and has poor resistance to acids and alkalis It has good weather resistance, but its resistance to chemical erosion is limited Acid and alkali resistant (microbial type), high and low temperature resistant (-30℃ to 80℃) Later maintenance cost The maintenance cost is approximately 60% of the initial cost every 10 years Grouting repair is required every 20 years, with a cost of approximately 30% of the initial No regular maintenance is required. Only in extreme cases is auxiliary repair needed Applicable scenarios Roofs and bathrooms of civil buildings General basements and factory buildings Subways, nuclear power plants, water conservancy hubs, super high-rise buildings At present, the mainstream technology can only repair micro-cracks with a width of no more than 0.3mm. If the crack width is greater than 0.3mm (such as structural cracks caused by loads), epoxy resin grouting and sealing should be used first, and then the micro-branch cracks should be repaired by self-healing components. The self-healing function cannot be relied on completely. It is necessary to add a "Self-healing performance special Test" : ① Artificial jointing test (prefabricate 0.2-0.3mm cracks on concrete test blocks, and test the permeability after 28 days of water storage, which should be ≤0.01L/m² · h); ② On-site core sampling inspection (drill a core sample of Φ100mm and observe the crack healing condition. The healing rate should be ≥80%). Although the initial material cost is 15% to 20% higher than that of ordinary self-waterproofing structures, the total life cycle cost is lower. Calculated based on a 70-year building lifespan, ordinary self-waterproofing structures require 2 to 3 repairs, and the total cost is approximately 1.8 times that of self-healing types. At present, in civil buildings, some high-end residential basements and roofs have adopted a composite solution of "microbial self-healing + penetrating crystallization", and its cost performance is gradually improving. (1) Metro tunnel: Use "capsule-type self-healing agent + fiber reinforced" waterproof concrete (C40/P10), with a self-healing agent dosage of 1.0kg/m³ and a fiber dosage of 1.2kg/m³. During construction, the reserved spacing of the induction joints is 8 meters, and the curing period is 21 days. One year after the opening to traffic, the micro-crack healing rate of the tunnel lining reached 92%, and there was no leakage. (2) Water conservancy water pool: "Microbial self-healing concrete" (C35/P12) is adopted, with a microbial agent concentration of 10⁹ CFU/mL and a nutrient carrier dosage of 2.0kg/m³. Through the monitoring of pre-embedded sensors, the 0.2mm crack was completely healed within six months, and the permeability coefficient dropped below 1×10⁻¹¹ m/s. When applying self-healing structural self-waterproofing to old buildings, it is necessary to first carry out the process through three steps: "crack detection – interface treatment – self-healing enhancement". (1) Crack detection: Use an ultrasonic detector to scan the walls and floor slabs, mark the location and width of the cracks. For cracks larger than 0.3mm, grouting and sealing are carried out first. (2) Interface treatment: Chisel off the original concrete surface layer (with a depth of 30-50mm), and apply a "self-healing interface agent" (such as a mixture of silica fume and microbial agent slurry). (3) Construction of self-healing reinforcing layer: Pour 50-80mm thick self-healing fine aggregate concrete (C35/P8, mixed with 0.8kg/m³ expansive self-healing agent), and conduct a water-tightness test after 14 days of curing to ensure there is no leakage. The following acceptance items should be added in accordance with the "Technical Code for Self-Healing of Concrete Structures" (CECS 378-2021) : (1) Detection of self-healing component dosage: The sampling and weighing method is adopted to ensure that the dosage of self-healing agent and bacterial agent meets the design requirements (deviation ≤±5%). (2) On-site self-healing performance testing: Pre-fabricate 0.2mm cracks on the structural surface. Observe no leakage after 24 hours of water storage. After 28 days, test the crack healing rate to be ≥80%. (3) Long-term monitoring data: The embedded sensors need to provide a report on the change in crack width within six months to ensure that no new cracks occur and the old ones continue to heal. The self-healing structural self-waterproofing technology, through an innovative mechanism of "actively repairing micro-cracks", addresses the pain points of traditional waterproofing, such as "easy failure", and ordinary structural self-waterproofing, such as "difficult crack resistance". It is particularly suitable for engineering scenarios with extremely high requirements for waterproofing reliability and durability. With the decline in material costs and the maturation of technology, it will gradually be popularized in civil buildings in the future.   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.