Concrete construction process and control program

  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.

    The "wavy" surface (also known as the "washboard" effect) that occurs during power trowel application is usually related to three core aspects: timing of intervention, machine condition, and operating skills. To avoid this phenomenon, please refer to the following targeted operating guidelines: This is the most common reason. If troweling begins when the concrete is too soft, the blades will push the slurry up, creating waves. Footprint Test: The optimal time to begin slurry application/troweling is when the worker stands on the concrete and the footprint depth is approximately 3mm-5mm. Initial Use of Float Pans: It is recommended to use slurry pans (float pans) for the first step. The large contact area and even pressure of the pans effectively eliminate minor undulations left from the initial paving and prevent the blades from directly cutting into the soft, wet concrete and creating grooves. Improper blade angle adjustment is the direct physical cause of wavy patterns. From Flat to Steep: During the first pass, the blades should be kept nearly horizontal (0° – 5°). As the concrete hardens, gradually increase the angle with each subsequent pass. Avoid Prematurely "Forced" Starts: If the blade angle is adjusted too large while the concrete is still relatively wet, the blade tips will cut into the surface like a "shovel," creating stepped wavy patterns. Overlapping Construction: Each troweling path should overlap the width of the previous path by 1/3 to 1/2. Cross-shaped Method: Change the troweling direction. If the first pass is east-west, the second pass should be north-south, using different dimensions of cutting to counteract textures created in a single direction. Uniform Speed ​​Movement: Keep the trowel moving smoothly and continuously. Dwelling in the same position for too long or suddenly accelerating will cause localized sinking. Vibration or imbalance of the equipment itself can also cause uneven surfaces. Blade Balance: Check if the blades of the power trowel are unevenly worn, bent, or loose. Any blade with inconsistent height will cause "jumping" during high-speed rotation. Bearings and Cross Assembly: Check the cross assembly of the power trowel for clearance or play.   Causes Manifestations: Corrective Measures: Premature intervention Surface slurry thickness and depth vary Wait for the concrete to harden until the footprint is 3-5mm deep. Excessive angle Distinct stepped horizontal lines Initially keep the blades horizontal, gradually increasing the angle. Simple path Undulating along the paving direction Use the cross-hatching method to smooth the surface multiple times. Uneven blades Regular arc-shaped scratches Replace or recalibrate the blades to ensure even stress on all four blades.   You can check these aspects: What is the current concrete slump? And did you use a trowel during the first pass of construction?   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.    

Do you know what is a laser leveler? This is a kind of equipment that uses laser as the reference plane, adopts the original receiving and sending system, and controls the leveling head in real time to achieve high-precision and rapid leveling of concrete. The use of laser leveling machines provides a lot of convenience for engineering construction. So how should we maintain the laser leveling machine after normal use? We will give you a specific introduction to the next article, thank you for your reading and support. 1. The operation method of the laser leveling machine will be introduced in detail for you 1) One operator checks the machine equipment before starting work, sets up the transmitter with the operator, and installs the handheld receiver; adjusts the scraper of the floor machine in a static state, and there must be no error in the two points; operates the concrete leveling machine and observes the machine Whether it is working normally, check whether the laser receiver is in a horizontal position, and supervise whether the material feeder picks up and fills in time; after the construction of the day is over, clean the machine after the laser leveling machine has cooled down, check whether the functions of the machine are normal, and check the power of the transmitter. 2) One operator shall assist the operator to install and debug the machine, set up the transmitter with the main operator, and install the handheld receiver. Check whether the location of the transmitter is safe; measure the height of the concrete after the initial paving (the range is controlled at 2mm ≥, ≤ 10MM); measure the height of the concrete after the laser leveling machine is leveled (the range should not be lower than -2MM and not higher than 3MM) Key points: Concrete edges and hand-scraped concrete surfaces; when the construction is over on the day, clean the machine after it cools down, and check the power of the hand-held receiver. 3) 2 filling workers When the laser leveling machine is not in operation, they will preliminarily level the concrete together with the pavers; when following the machine, they must obey the command of the main machine crew to scrape and fill the position of the machine scraper (required The concrete material shall not be lower than the edge of the scraper, and shall not be higher than the edge of the scraper by 35MM). 4) 2-4 pavers must obey the command of the operator; carry out preliminary leveling of the concrete. 2. Laser leveling machine manufacturers describe how to maintain 1) The liquid crystal surface on the body of the laser leveling machine also needs to be cleaned. You can use organic resin or a special cleaning cloth for the lens to wipe the dirt. If there is too much dirt, you can use the lens cleaning solution to remove it. 2) After the laser leveling machine is constructed, there will be a lot of dust and mud. First, the dust on the laser leveling machine should be wiped clean, and the dirt and oil stains should be wiped clean with tissue paper or cotton cloth. 3) If the laser signal is lost during the construction of the laser leveling machine, the machine needs to be restarted, and the interval should be more than ten seconds. 4) If there are too many stains, you can use a soft cloth to soak in water diluted with a neutral detergent, and then wring out to clean. The laser leveling machine manufacturer reminds everyone not to use volatile oil, thinner, gasoline and other chemicals to clean wipe. The use of advanced construction equipment and concrete laser leveling machines can not only shorten the construction period, but also ensure the construction quality to a large extent. This high-grade ground can guarantee normal use for more than 20 years, which can greatly reduce the use and maintenance costs. Through the introduction of the article, I believe everyone has already understood how to operate the laser leveling machine. If you have other needs to know or are interested in our products, welcome to continue to pay attention to our official website, and look forward to your reading and support for more exciting information in the future.