Can self-leveling cement be used directly as a floor?

– Under normal working conditions: If the trowel is used in a relatively ideal working environment (clean, suitable temperature, normal load) and is regularly maintained, the drive chain can generally be used for about 1000-1500 hours. For example, the service life of the trowel chain used in a small indoor concrete prefabricated parts processing workshop may be close to this upper limit. – Under harsh working conditions: In a working environment with a lot of dust, high humidity or frequent overload shock, the wear of the chain will be aggravated. For example, at an outdoor construction site, the chain may be eroded by sand, dust and rain, and due to frequent starts and stops during construction, sudden changes in load, etc., the chain may need to be replaced in 500-800 hours. – Under normal working conditions: The service life of a good quality drive belt is about 800-1200 hours under normal use and maintenance conditions. For example, in some industrial plants, trowels are used for daily maintenance of the floor. The working environment is relatively stable, and the belt may be used for a long time. – Under harsh working conditions: When the belt is in a high temperature and high humidity environment for a long time, or is contaminated by oil or chemicals, its performance will decline rapidly. For example, in a trowel used in a factory workshop with the risk of chemical leakage, the belt may have serious problems such as slipping and aging in 400-600 hours and need to be replaced. – Under normal working conditions: For gears with high precision and good materials, they can generally be used for 2000-3000 hours under normal working conditions. For example, in a trowel used in an indoor high-precision concrete product workshop, the gear wears relatively slowly. – Under harsh working conditions: Under high load, frequent start and stop, poor lubrication or foreign matter entering the gearbox, the gear tooth surface will have serious wear and tooth root fatigue fracture. For example, in the construction of heavy-loaded port concrete dock floors, gears may need to be replaced in 1000-1500 hours. In addition to the reference working time, the actual usage conditions should also be considered when judging whether the transmission parts need to be replaced. For example, when the transmission parts are loose, slipping, severely worn (chain links are elongated by more than 3% – 5%, belts are cracked or peeled, gear tooth surfaces are worn by more than 0.5 – 1mm, etc.), or produce abnormal noise or vibration, the transmission parts should be inspected and replaced in time even if the reference working time is not reached.

    To incorporate the operation of concrete laser leveling into the project's comprehensive quality management system and achieve full-process quality control, a systematic approach is required. This is not merely about operating the machine itself, but rather managing it as a core link in the entire construction process. The following is a detailed framework and implementation plan on how to integrate it into the total quality management system in stages and at different levels: Traditional quality management relies on manual inspection and repair after pouring, while total quality management requires us to bring quality control forward and incorporate it throughout the entire process before, during and after the event. The laser leveling is an excellent tool for realizing this concept because it combines "measurement" and "leveling" into one, providing a data foundation for process control. The entire process can be divided into three main stages: This is the most crucial stage, which determines the success or failure of the subsequent assignments. Technical Preparation and briefing Specialized plan compilation: Prepare the "Specialized Construction Plan for laser leveling Machines", clearly defining key processes such as equipment selection, reference point layout rules, personnel division of labor, walking routes, pouring sequence, and joint treatment. Deepening design: Communicate with the design unit to clearly define the positions of the floor's partition joints and expansion joints on the drawings, as well as the operation zones of the laser leveling machine, to ensure that the leveling plan matches the structural design. Three-level technical briefing: Conduct layer-by-layer briefings for the company's management, project management, and work teams to ensure that all relevant personnel understand the quality objectives, operational key points, and acceptance criteria. Personnel training and qualification certification Operator certification: The operator of the laser leveling machine must undergo strict training by the equipment manufacturer or internal certification and hold a certificate to work. They not only need to understand machines, but also the characteristics of concrete. Team collaboration training: Conduct collaborative operation training for auxiliary workers (such as those responsible for loading materials, leveling, and handling edges and corners) to form an efficient operation team. Equipment and system verification Calibration of laser leveling: Before each operation, the laser emitter, receiver and elevation control system of the equipment must be calibrated and reset to zero. Establish the "Daily Inspection Form for Equipment". Reference system review: The surveyor independently reviews the laser reference network (or GPS reference) set up within the field to ensure that its absolute elevation and levelness meet the design requirements. This is the "origin" of quality and must be foolproof. Acceptance of grassroots and formwork: Base treatment: Strictly inspect the compactness, elevation and slope of the base (usually compacted crushed stone or concrete cushion). The quality of the base layer directly determines the final quality of the surface layer. Formwork erection: The top elevation of the formwork must be precise and firm and stable. The stiffness and stability of the template are the keys to preventing edge collapse and elevation loss of control. This is the execution stage, with the core being "real-time monitoring and immediate correction". Concrete incoming material control Slump management: Randomly check the slump of concrete at fixed points on the pouring site. The most suitable slump for a laser leveling is usually between 120mm and 150mm (adjusted according to specific equipment and process). If it is too high, it is prone to cracking; if it is too low, it will be difficult to level. Establish an exit mechanism for those with unqualified slump. Continuous supply guarantee: Coordinate with the mixing plant to ensure the continuity of concrete supply and avoid cold joints. Process control of laser leveling operation Guide system: Assign a dedicated person (usually a foreman or quality inspector) to check in front of the leveling whether the thickness of the loose concrete is appropriate and promptly direct adjustments. Real-time data recording: Utilize the built-in data output function of the leveling machine (if any), or have the quality inspector conduct a quick spot check on the just-leveled area using traditional tools (such as a straightedge or feeler gauge), and record the flatness data. Establish a "Laser Leveling Operation Process Record Form". Abnormal situation handling process: Clearly define the emergency response plan for abnormal situations such as equipment failure, laser signal loss, and sudden change in concrete quality (e.g., immediately suspend, switch to backup equipment, mark the problem area, etc.). Collaborative Work Management Follow-up operation: After the leveling machine is completed, personnel should be promptly arranged to handle the edge and corner treatment and bleeding treatment. The film coating or curing agent operation should be initiated during the initial setting stage to prevent surface water loss and cracking. This stage aims to confirm the achievements and form a closed loop. Digital Acceptance and Data Analysis High-precision acceptance: After the concrete reaches a certain strength, professional equipment (such as floor flatness testers, 3D laser scanners) is used for full coverage digital acceptance, generating flatness, elevation cloud maps and analysis reports. Comparison with the target: Compare the measured data with the quality targets set in the QMS (such as FF/FL values), and conduct statistics on the pass rate. Defect Analysis and traceability Conduct a root cause analysis of any areas that exceed the standard. Is it a grassroots issue? Template issue? Concrete problems? Is it still a problem with the operation of the leveling machine? Trace back using the process record sheet. Establish a quality defect database: Input typical cases, cause analysis and corrective measures into the company's knowledge base for training and improvement in subsequent projects. Outcome Feedback and System Optimization Project summary meeting: Organize a special summary to assess the quality, efficiency and cost of this laser leveling operation. Optimize standard documents: Based on the experiences and lessons learned from this practice, update the "Special Construction Plan for laser leveling Machines", "Operation Instruction Manual" and "Quality Control Point List" to achieve continuous improvement of the quality management system (PDCA cycle). To truly achieve "inclusion", it is necessary to clearly define in the system documents and organizational structure: Clarify the quality responsibility subject Project Manager: Fully responsible for the quality of the floor. Production Manager/Foreman: Responsible for the execution of operation plans and resource coordination. Quality Engineer/Quality Inspector: Responsible for independent quality supervision, inspection and record-keeping. laser leveling machine operator: Directly responsible for the quality of the leveling process. Update the quality management system documents In the company's "Quality Manual" and "Procedure Documents", add relevant chapters on "Quality Control of Mechanized Construction of Floor Engineering". Compile and improve the various operation instructions, quality standards and record forms mentioned above, making them standardized tools for the operation of the system. Utilizing information technology means (QMS software /BIM) Upload the process data and final acceptance data of the laser leveling machine to the project quality management platform to achieve data visualization. Compare the BIM model of the floor with the measured data to visually display the deviation between the construction quality and the design goals. Through the information system, the automatic push, rectification and closure process of quality issues is realized. Incorporating the operation of concrete laser leveling into the total quality management system essentially transforms an efficient construction machine into a controllable quality process that integrates personnel, methods, materials, measurements and the environment. Through the full-process management of "meticulous planning in advance, strict monitoring during the process, and scientific verification after the event", supplemented by clear responsibility systems, standardized documents and a complete information feedback mechanism, a true leap from "relying on experience" to "relying on data and processes" can be achieved, and ultimately high-quality concrete floors can be produced stably and efficiently.   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.    

Laser leveling machines have high requirements and standards for road surface smoothness. When performing road surface smoothing, the requirements for smoothness are still relatively high. This is because the smoothness of the road surface also plays a big role in the beauty of the environment. Generally speaking, if manual leveling is used, the effect will not be very good. Fortunately, there are laser leveling machines now, and many construction units have also chosen laser leveling machines for road smoothing operations. So laser leveling machines How does it achieve such excellent leveling effect? Laser leveling machines have high requirements and standards for road smoothness 1. Control of the laser leveling machine's baseline: When the leveling machine performs automatic leveling, it needs an accurate reference surface. Generally, when the main focus is to control the height, the tightrope method is suitable; when the main focus is to control the thickness, the floating datum beam method is adopted. Generally, tightrope is used for the bottom layer, and floating datum beam method is used for the middle layer and surface layer. The benchmark wire rope method is to install benchmark wire ropes on both sides of the road, but note: the spacing between the pillars and steel bars supporting the steel wire ropes cannot be too large, generally 5-10m; the steel bars should be 1-2mm higher than the design elevation, and the elevation of the steel bars must be ensured when laying Always accurate during the construction process. 2. Paving speed control of laser leveling machine: The leveling machine should work at a constant speed without stopping, and it is strictly forbidden to be fast and slow. During the leveling process, stoppages should be avoided as much as possible, and the necessary daily stoppages should be placed at the location where the contraction joint is scheduled to be made at one end of the structure. In case of shutdown in the middle, the leveling of the leveling should be locked to prevent it from sinking; when the mixture temperature is above 100°C, the pause time should not exceed 10 minutes. When the pause time exceeds 30 minutes or the mixture temperature is below 100°C, Re-seam according to the method of treating cold seams 3. Laser leveling machine operation control measures: Skill ed laser leveling machine operators should be selected and given pre-job training; during the paving process, the material transport truck should stop 10-30m away from the laser leveling machine and In neutral gear, rely on the laser leveler to push forward slowly, and there should be a dedicated person to direct the unloading truck to unload; ensure the continuity of the work of the leveling machine's feeding system, that is, ensure the height of the material level in the casters (conveyor wheels) Stable, uniform and continuous, the material level height should be kept at 2/3 of the blade above the central axis. Before construction, the leveling must be cleaned. After adjusting the height and cross slope of the leveling, preheat the leveling. The preheating temperature of the leveling should be close to the temperature of the asphalt mixture, which can generally be heated to 85°C-90°C.