Specifications for Rebar Tying in Prefabricated Houses
The specifications for rebar tying in prefabricated houses mainly include requirements for full tying, skip tying, tool selection, and handling of special areas.
Full Tying Requirements: In the rebar tying of prefabricated houses, full tying is a crucial step. Key areas such as foundations, beam-column junctions, and intersections of main and secondary beams must be fully tied, with no crossing points missed. These areas are the core regions where the house structure bears forces. Full tying ensures tight connections between rebars, effectively transmitting stresses and safeguarding structural safety. At the edges and corners of rebar meshes, as well as in special force-bearing areas like balconies, canopies, overhanging slabs, and stair sections, all crossing points must be firmly tied. These areas have complex force conditions, and full tying enhances their overall integrity and stability. For force-bearing components such as beams, columns, and overhanging parts in the house, the rebars should be fully tied, with each node tied securely and wrapped tightly. Additional binding wires can be added at the edges if necessary to enhance the rebars' anchoring capacity and prevent rebar slippage. For areas that are prone to being stepped on, such as roof rebars after tying, where people may go for inspection or construction, full tying is recommended to increase the rebars' own load-bearing capacity and avoid deformation due to stepping, which could affect structural quality.
Skip Tying Requirements: Rebars in non-force-bearing areas can be skip-tied, meaning that at rebar nodes, one is tied and the next is skipped, arranged in a quincunx pattern, commonly seen in distribution rebars of floor slabs. This tying method not only meets the basic requirements for rebar connections in the structure but also saves binding wires and labor, improving construction efficiency.
Tool Selection: Specialized rebar tying hooks (tying tools) must be used for tying. Specialized tying hooks are reasonably designed, easy to use, and can better complete the rebar tying work, ensuring tying quality and avoiding problems such as loose tying due to improper tools.
Handling of Special Areas: The stirrups installed below the rebars should be firmly tied to prevent displacement or collapse, which could lead to the failure of double-layer rebars. Stirrups support the upper-layer rebars, and if not tied securely, they can affect the spacing and overall stability of the double-layer rebars. At positions where electrical conduits are arranged among the rebars, it is recommended to fully tie the rebars because the installation of conduits and water pipes may damage the original rebar fixation. Full tying enhances the rebars' resistance to damage and ensures structural safety.
