Tell you how effective the concrete laser leveling machine is!
Many consumers are still hesitating whether they should buy a concrete laser leveling machine, because they have no concept of the construction effect of the equipment. Today we will introduce the use effect of the equipment. First of all, the biggest feature of this equipment is that it is fast, and the time-consuming is 1/10 of manual work, which is enough to make many construction teams excited; secondly, it is flat, and the ground level error after paving is small , is almost negligible.
1. Requirements for concrete and formwork
① Concrete: Concrete must be produced, conveyed or pumped to the flooring site by a commercial concrete production plant.
② Concrete specifications: C25~C30 concrete, the strength of which is not less than 25MPa in 28 days, according to the design requirements.
③ Water-cement ratio: No more than 0.5, no water can be added during the feeding process.
④ Cement: Use ordinary Portland cement with a grade of not less than 42.5.
⑤ Aggregate: Well-graded aggregate should be used. Crushed granite or pebbles are used as coarse aggregate, and the maximum diameter is not more than 25mm. The fine aggregate is clean river sand with a fineness modulus of 2.4-2.7.
⑥ Concrete mix ratio: The amount of cement is not less than 350Kg/m3. In order to avoid surface quality problems, the sand rate should be controlled at 35% to 40%.
⑦ Concrete slump: 14±2cm, maximum 16cm.
⑧ Setting time: The initial setting time should be controlled within 3-5 hours.
In order to avoid the excessive deviation of the surface elevation affecting the joints, the formwork should be steel formwork. The height of the formwork should be controlled within +0 and -2mm, and the steel formwork should be within 1-1.2 meters from the surrounding walls.
2. Construction cooperation requirements
① The concrete feeding speed should be determined according to the ground thickness and pouring area to determine the minimum hourly feeding speed. For a floor with a thickness of 200 mm, if the width of one-time pouring reaches 40 meters, the minimum feeding speed should reach 40 cubic meters per hour, otherwise there will be cold joint problems, which will affect the quality of ground construction.
② Manually coordinate the concrete sent to the platform, and workers need to remove it as soon as possible and roughly level it. In addition, the areas around the formwork, walls, columns, trenches, equipment foundations, floor drains or around pipelines that cannot be leveled require manual cooperation for local leveling. Generally, 3-4 workers are required to cooperate with the construction (provided by Party A).
③ Other precautions In order to ensure the flatness of the ground, attention should be paid to:
1) The slump of concrete sent to the platform must be consistent each time.
2) Ensure that the concrete feeding speed reaches 40 cubic meters per hour or above, and the initial setting time of each batch of concrete must be consistent.
3) Ensure that the formwork elevation is accurate and cannot be disturbed during construction.
4) Environmental cooperation. The concrete floor that has just been constructed cannot be exposed to sunlight, wind, rain, etc. that are unfavorable to concrete health.
④ Other requirements:
A. In order to avoid random cracks in the floor, the cutting time of shrinkage joints should be carried out as early as possible (within 24 hours).
B. At the same time as the construction of the laser leveling machine, there should be no electric welding machines on site, and no reflective objects (such as glass windows).
C. The foundation must reach a certain hardness to ensure that the laser leveling machine does not collapse when working on the ground.
D. The height of the ground in the factory building shall be calibrated by Party A, and the points must be evenly distributed, and there must be no error in the levelness.
E. Pouring concrete must be operated according to the requirements of Party B's technicians.
