Maintenance of underground parking lot floor

YZ40-4 large-scale telescopic boom laser leveling machine is equipped with laser system and full hydraulic control system,  which makes the concrete construction ground level more accurate, and at the same time of high-efficiency construction,  it can meet high-standard construction requirements. YZ40-4 large-scale telescopic arm laser leveling machine controls the  leveling head in real time through the laser receiver on the laser leveling machine, so as to realize the equipment for high-precision  and fast leveling of concrete. 1. High construction quality: The ground construction of laser leveling machine can significantly improve the flatness of the ground,  the average flatness can reach 2mm, and the flatness quality is more than 3 times higher than the traditional method. It can also realize  large area construction, reduce a large number of construction gaps, the required concrete collapse can be reduced, the concrete strength  is guaranteed, so that the ground integrity is good, not easy to crack.  2. Fast construction speed: more than 3 times the work efficiency than  the traditional beam vibrator, scraper, manual paving and so on, the average daily can complete 3,000 square meters of ground pouring,  especially suitable for the simple shape, large working surface of the floor layer construction.  3. Reduce the amount of template support:  with 20000 square meters of concrete pavement statistics, the traditional method needs to support 6300m side of the template, and the  use of laser leveling machine construction, support only 2400m, template consumption is only 38%.  4. High degree of automation, small labor intensity: the heavy manual labor into mechanical spreading, vibrating, leveling, pulping, so that the operator reduces 30%,  while reducing labor intensity. 5. High economic benefits: compared with the traditional process, the cost per square meter is reduced by 30%,  and the ground maintenance cost is reduced in the later stage, thus significantly improving the economic benefits.

  General concrete slab: According to the "Concrete Structure Design Code", when the slab thickness is not more than 150mm, the steel bar spacing should not be greater than 200mm; when the slab thickness is greater than 150mm, the steel bar spacing should not be greater than 1.5 times the slab thickness, and should not be greater than 250mm. Residential roof panels: For multi-story residential roof panels, when the roof panels are at the corners of the house and the span ≥3.9m, double-layer bidirectional continuous steel bars should be set. The steel bar spacing at the corners should not be greater than 100mm, and the steel bar spacing of the floor slab with a span of ≥3.9m should not be greater than 150mm. The steel bar diameter should not be less than φ8. Highway cement concrete pavement: When cold-rolled ribbed steel bars are used, the steel bar diameter should not be less than 8mm, the longitudinal steel bar spacing should not be greater than 200mm, and the transverse steel bar spacing should not be greater than 300mm.   Rectangular column: The horizontal spacing should not be greater than 200mm, and the vertical spacing should not be greater than 300mm. Circular column: The horizontal spacing should not be greater than 150mm, and the vertical spacing should not be greater than 200mm.   General wall: Usually the horizontal and vertical steel bars are spaced about 150-300mm, which is determined according to the stress conditions, height, thickness, etc. of the wall. For example, the spacing of the steel bars in the filling walls of some buildings may be larger; while for the shear walls under stress, the spacing of the steel bars will be relatively small to ensure the shear and bending resistance of the wall. Hydraulic structure wall: Due to the high requirements for waterproofing and anti-seepage, the spacing of the steel bars is usually small and the arrangement is dense. Generally, the horizontal and vertical steel bars are spaced 100-200mm to improve the crack resistance and anti-seepage of the concrete and prevent water leakage.   For general beams, the longitudinal steel bar clearance shall not be less than 30mm at the top and 25mm at the bottom, and shall not be less than the steel bar diameter. The upper row clearance at the bottom shall not be less than twice the lower row clearance, and the upper and lower rows clearance shall not be less than 25mm. When the beam bears a large load or has special requirements, the steel bar spacing may be appropriately adjusted according to the calculation, but it must meet the minimum spacing required by the specification to ensure that the steel bar and concrete work together and facilitate the pouring and vibration of the concrete.   Long-span structures: such as long-span bridges and gymnasium roofs, in order to ensure the safety of the structure under large loads and deformations, the steel mesh spacing is usually small and the steel bars are densely configured, generally between 100-200mm, which is determined by structural calculation according to the span size, load type, etc. High-rise buildings: The loads borne by its foundations, columns, walls, beams and other structural components are large, and there are strict requirements for the steel mesh spacing. For example, the spacing of steel bars in the foundation raft of a high-rise building is generally 150-250mm; the spacing of steel bars in shear walls is usually 150-300mm; the spacing of steel bars in frame columns and beams is similar to that in ordinary buildings, but may be denser in some key parts to improve the seismic performance and bearing capacity of the structure.   It should be noted that the above steel mesh spacing standards are only for reference. The determination of the steel mesh spacing in actual projects needs to be determined by professional structural engineers based on the specific project conditions, following relevant design specifications and standards, and through rigorous calculation and analysis.  

To deal with the construction challenges of concrete laser leveling machines under special ground conditions, the following measures can be taken: 1. Strengthen technical training: Ensure that operators are familiar with machine performance and can operate accurately. Especially when facing different ground conditions, they should be able to flexibly adjust machine parameters. 2. Choose the appropriate construction method: Choose the appropriate construction method according to the ground conditions. For example, for soft ground, the preloading method or filling method can be used; for hard ground, the crushing method or milling method can be used. 3. Strengthen on-site management: Ensure the construction site is orderly and avoid cross-operation and chaos. At the same time, strengthen material management to ensure the quality and supply of concrete and other materials 4. Use auxiliary equipment: As needed, auxiliary equipment such as vibrators and polishers can be equipped to improve the leveling quality and efficiency. 5. Regular maintenance and upkeep: Ensure the normal operation of the machine by regularly inspecting and maintaining key components, such as laser transmitters, sensors, etc. 6. Strengthen communication and collaboration: Maintain close communication with all parties such as design and construction, solve problems encountered during construction in a timely manner, and ensure smooth progress of construction. 7. Use intelligent technology: Consider using automation and intelligent technology, such as machine vision, intelligent control, etc., to improve construction efficiency and accuracy. 8. Pay attention to safety: During the construction process, you should always pay attention to safety and take necessary safety measures to ensure the safety of personnel and equipment. In short, dealing with the construction challenges of concrete laser leveling machines under special ground conditions requires comprehensive consideration of technology, management, collaboration and other aspects. By strengthening training, selecting appropriate construction methods, strengthening on-site management, using auxiliary equipment, regular maintenance and upkeep, strengthening communication and collaboration, adopting intelligent technology, and paying attention to safety, we can effectively deal with these challenges and improve construction efficiency and project quality. .