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Steel brace
- 产品描述
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Common wall thickness corresponds to the total length of the screw (reference value)
Wall thickness mm) Template+wooden square+steel pipe total thickness (mm) Recommended total length of screw (mm) Applicable scenarios 100 (interior wall) 250 (conventional support) 350~400 Residential partition walls, indoor partition walls 200 (exterior wall) 280 (Strengthen Support) 480~500 Exterior walls and frame infill walls of commercial housing 300 (thick wall) 300 (heavy support) 600~650 Non load bearing partition wall in basement 500 (civil defense wall) 350 (ultra-high strength support) 850~900 Civil air defense basement, underground garage 800 (continuous wall) 400 (special support) 1200~1250 Deep foundation pit support, underground retaining wall Matching accessory size (to match the screw specifications)
Wall penetrating screws should be used with mountain shaped clamps, nuts, and waterstops (for waterproof walls), and the size of the accessories should correspond to the diameter of the screw to avoid loosening or failure:
Screw specifications Mountain card size（mm） Nut specifications Waterstop size (mm, for waterproofing) M12 65×65×5（height × width × thickness） M12 Φ 30×1.5 (diameter × thickness) M14 70×70×6 M14 Φ35×2.0 M16 75×75×6 M16 Φ40×2.0 M18 80×80×8 M18 Φ45×2.5 M20 90×90×8 M20 Φ50×3.0 Key tip: Waterproof walls (such as basement side walls and bathroom walls) must use through wall screws with water stop strips. The water stop strips must be fully welded to the screws (weld height ≥ 1/2 of the screw diameter) to prevent water leakage.
Special specifications: non-standard and customized
In addition to conventional specifications, special sizes can be customized according to engineering requirements. Common scenarios include:
1. Ultra long screw: used for ultra thick walls (such as over 1m), with a total length of 1500-3000mm that can be customized. High strength steel (Q355) should be used and intermediate support should be added to prevent the screw from bending.
2. Fine tooth screw: specifications such as M16 × 2 (pitch 2mm, conventional coarse tooth 2.5mm), suitable for templates with high precision requirements (such as plain concrete walls), with more precise adjustment.
3. Three section screw: composed of "inner rod+outer rod+connecting sleeve", the inner rod is left inside the wall, and the outer rod can be reused. The commonly used specifications are M14/M16, and the length of the inner rod is equal to the thickness of the wall+2 times the length of the waterstop (about 50mm).
Selection precautions
1. Load matching: The lateral pressure of concrete increases with the height of pouring (for example, when the pouring height is 3m, the lateral pressure is about 30kN/m ²), and the screw diameter and spacing need to be determined through calculation (conventional spacing is 400-600mm).
2. Material requirements: Q235 steel is used for ordinary walls, Q355 steel is used for waterproof/heavy-duty walls, and non-standard "slimming screws" (insufficient diameter, poor quality material) are strictly prohibited to avoid the risk of mold bursting.
3. Size reservation: The total length of the screw should be 10-20mm more than the "wall thickness+support thickness" to facilitate the installation of nuts and mountain shaped clips, avoiding insufficient length that may cause failure to tighten.
By matching the above specifications and dimensions, it can be ensured that the through wall screw can stably bear the load in the formwork support, ensuring the quality of concrete pouring.
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