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How is the construction process of concrete pavement with double-layer steel mesh different from that of single-layer steel mesh?
How is the construction process of concrete pavement with double-layer steel mesh different from that of single-layer steel mesh?
The construction process of concrete pavement with double-layer steel mesh differs from that of single-layer steel mesh in the following aspects:
Steel bar processing and installation
– Single-layer steel mesh:
– Steel bar processing mainly involves straightening, cutting, bending, etc. according to design requirements. After the processed steel bars are transported to the construction site, they are laid directly on the base.
– Usually, the steel mesh is placed in the designated position by manual or small machinery, and fixed with iron wire or steel bar horse stool to ensure that there is a certain protective layer thickness between the steel mesh and the base, generally 3-5cm.
– Double-layer steel mesh:
– In addition to basic steel bar processing, for double-layer steel mesh, supporting steel bars or horse stool bars need to be set between the upper and lower steel meshes to ensure that the spacing between the two layers of steel mesh meets the design requirements, generally about 15-30cm.
– First lay the lower steel mesh, and then install the upper steel mesh after fixing it. During the process, the position and spacing of the two layers of steel mesh must be strictly controlled to ensure that they do not shift during the concrete pouring process.
Formwork installation
– Single-layer steel mesh:
– The installation of the formwork is mainly to ensure that its position is accurate and firm, and it can withstand the lateral pressure during concrete pouring. The height of the formwork is generally consistent with the design thickness of the concrete pavement.
– Double-layer steel mesh:
– Due to the existence of double-layer steel mesh, the installation of the formwork requires higher precision. When installing the formwork, it is necessary to consider the position of the steel mesh and the thickness of the protective layer to ensure that the spacing between the formwork and the steel mesh is uniform, and to prevent the formwork from squeezing the steel mesh and causing its position deviation.
Concrete pouring and vibration
– Single-layer steel mesh:
– When pouring concrete, the concrete can be directly poured into the formwork, and the inserted vibrator and the flat vibrator can be used to vibrate to make the concrete dense. During the vibration process, be careful to avoid the vibrator rod directly touching the steel mesh to avoid displacement of the steel mesh.
– Double-layer steel mesh:
– When pouring concrete, in order to avoid the upper steel mesh displacement caused by the impact of concrete falling, a more reasonable pouring method needs to be adopted, such as evenly spreading the concrete along one side of the formwork, allowing the concrete to slowly flow to the other side, or using a layered pouring method.
– When vibrating, in addition to using an insert vibrator and a flat vibrator, for the concrete between the double-layer steel mesh, it may be necessary to use a small vibrating rod or vibrating sheet for auxiliary vibration to ensure that the concrete can be fully compacted between the two layers of steel mesh. At the same time, pay more attention to the operation of the vibrating rod to avoid touching the steel mesh and causing it to deform.
Surface treatment and maintenance
– Single-layer steel mesh:
– After the concrete is vibrated, use a scraper to flatten the surface, and then perform surface treatment procedures such as smoothing, and finally cover with a curing film or sprinkle water for maintenance to keep the concrete surface moist and prevent the surface from losing water and cracking.
– Double-layer steel mesh:
– During surface treatment, due to the restraining effect of the double-layer steel mesh on the concrete surface, more care should be taken during operations such as polishing to avoid uneven surfaces caused by the influence of the steel mesh.
– During the curing process, it is necessary to ensure that the curing measures can fully cure both the interior and surface of the concrete, because the double-layer steel mesh will affect the migration and heat dissipation of the moisture inside the concrete to a certain extent, so the curing time may need to be appropriately extended, generally not less than 7 days.
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About the Author: Shandong Vanse Machinery Technology Co., Ltd.
Shandong Vanse Machinery Technology Co., Ltd. is a high-tech manufacturer specializing in concrete construction machinery, including laser screeds and related equipment. The company integrates R&D, production, and global sales, with products exported to over 60 countries and widely used in infrastructure projects worldwide.
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