What occasions is the concrete troweling machine suitable for?

▶1◀ Technical Overview The rapid construction technology of large-area and high-flatness floors in automobile factories is an efficient and high-precision floor construction method. It is mainly used in floor construction of industrial factories such as automobile manufacturing and machinery manufacturing. This technology uses advanced laser leveling technology and equipment to achieve high flatness requirements for large-area floors, while improving construction efficiency and shortening the construction period. ▶2◀ Key points of construction technology 1. Before construction , clean and level the construction site to ensure that there are no debris or bumps on the ground. At the same time, according to the design requirements and construction conditions, select the appropriate laser leveler and other auxiliary equipment, and carry out inspection and debugging. 2. Concrete mix proportion design: Carry out concrete mix proportion design based on the design requirements and material properties of the floor. While meeting the strength requirements, optimize the mix ratio, reduce the amount of cement, reduce the heat of hydration, and avoid cracks in the concrete. 3. Concrete pouring and leveling shall adopt the method of large-area concrete pouring, and concrete shall be poured continuously according to the construction sequence. A laser leveler is used to initially level, vibrate and finely level the concrete to ensure the flatness and compactness of the floor. During the leveling process, pay attention to controlling the traveling speed and elevation of the leveling head to avoid excessive vibration or vibration leakage. 4. Surface treatment and maintenance: After the concrete is initially set, use a polishing machine to polish the floor surface to improve the gloss and wear resistance of the floor. During the maintenance period, keep the floor surface moist and take appropriate moisturizing measures to prevent cracks. 5. Quality inspection and acceptance After the floor construction is completed, quality inspection and acceptance will be carried out. The testing content includes the flatness, strength, wear resistance and other aspects of the floor. For unqualified floors, promptly handle and repair them. ▶3◀ Technical advantages 1. High flatness: Using laser leveling technology, high-precision floor flatness requirements can be achieved and the visual effect and performance of the floor can be improved. 2. Rapid construction: Compared with the traditional manual scraping method, the laser leveling machine has higher production efficiency, can shorten the construction period and reduce the construction cost. 3. High degree of automation: Laser leveling machines and other equipment have a high degree of automation, which can reduce manual operations and human errors and improve construction quality. 4. Wide scope of application: This technology is suitable for floor construction of various large-area industrial plants with high flatness requirements, such as automobile manufacturing, machinery manufacturing, electronics industry and other fields. 5. Environmentally friendly: There is no noise, no vibration and no pollution during the construction process, which is in line with the concept of green construction. To sum up, the rapid construction technology of large-area and high-flatness floors in automobile workshops has significant advantages and characteristics. Through reasonable construction preparation, concrete mix ratio design, pouring and leveling surface treatment and maintenance, as well as quality inspection and acceptance and other construction technical points, the quality and efficiency of floor construction can be effectively improved. In the future, with the continuous advancement of technology and the expansion of application scope, this technology will play a more important role in industrial construction fields such as automobile factories.

  – Tools and methods: Use a 2-meter ruler and a feeler gauge for measurement. Place the 2-meter ruler on the concrete surface so that it fits tightly against the ground, and then use the feeler gauge to measure the maximum gap between the ruler and the ground. For general industrial and civil building floors, the allowable flatness deviation is usually within 4-5 mm; for places with high precision requirements, such as electronic chip production workshops, precision instrument laboratories, etc., the flatness deviation requirement may be within 2-3 mm. If the measured gap is within the specified range, it means that the compaction effect of the trowel meets the quality standards in terms of flatness. – Visual inspection to assist judgment: In addition to tool measurement, it is also important to observe whether the ground has obvious waves, potholes or bulges by naked eyes. Stand at a certain distance (such as 5-10 meters) to observe the overall effect of the ground to see whether the light is reflected evenly on the ground. If the ground reflects light evenly without obvious changes in light and shadow, it usually means that the ground is relatively flat and the compaction effect is good. – Rebound hammer test: Use a rebound hammer to test the concrete surface. The rebound hammer hits the concrete surface and infers the strength of the concrete based on the rebound value, which indirectly reflects the density. During the test, multiple test points should be selected on the concrete surface (generally no less than 3 points per 10 square meters) to calculate the average rebound value. Concrete of different strength grades has a corresponding standard range of rebound values. For example, the rebound value of C30 concrete is generally between 34 and 46. If the rebound value obtained by the test is within the standard range of concrete of the corresponding strength grade, it means that the concrete density is high and the compaction effect of the trowel is good. – Core sampling analysis: In some cases with extremely high quality requirements or disputes, the core sampling method can be used. Use professional core drilling equipment to take out core samples with a diameter of usually 100-150 mm in the concrete structure. Observe the appearance of the core sample, which should be uniform in texture and without obvious pores and stratification. Then send the core sample to the laboratory for compressive strength testing and porosity analysis. The compressive strength meets the design requirements and the porosity is low (generally no more than 5% – 8%, depending on the specific project requirements), indicating that the density of the concrete meets the quality standards and the compaction effect of the trowel machine is qualified. – Visual observation: Carefully observe the trowel traces on the concrete surface. The trowel traces should be uniform and continuous, without obvious depth or interruption. If the trowel traces are uniform, it means that the pressure applied by the trowel machine to the ground during work is uniform and the compaction effect is good. For example, after the construction of a large area of ​​parking lot floor, the trowel traces on the entire floor should show a consistent texture, without local roughness or over-troweled areas. – Touch inspection: Touch the concrete surface with your hand to feel whether its smoothness and hardness are uniform. If the surface feels consistent and there is no local softness or over-hardness, it can also indicate to a certain extent that the compaction effect is uniform and meets the quality standards. – Test block test under the same curing conditions: During the concrete construction process, make test blocks that are cured under the same conditions as the actual construction concrete. At the specified age (such as 7 days, 28 days), the compressive strength of the test block is tested, and the test results are compared with the design strength grade. If the strength of the test block can reach or exceed the design strength according to the expected growth curve, it means that the compaction operation of the trowel machine has no adverse effect on the strength of the concrete, and the compaction effect meets the quality standards. – On-site rebound-core drilling comprehensive method evaluation: Combined with the rebound hammer test and core drilling sampling, the strength of the on-site concrete structure is comprehensively evaluated. The rebound hammer is used to quickly screen out areas that may be insufficient in strength, and then core drilling sampling is performed on these areas for verification. If the overall strength of the on-site concrete meets the design requirements, and the strength distribution in different areas is relatively uniform, it means that the compaction effect of the trowel machine is good and meets the quality standards.

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