Tempo:
Formwork for Foundations Formwork for concrete walls must be tight, well-braced and tied to withstand the pressure of the concrete. Reusable forms are made of plywood or steel. Steel form ties are used to hold the two sides of the formwork together and to serve as spreaders to maintain the necessary width between the formwork (Figure 37). The ends of the ties are usually broken off after the concrete has cured and the holes are patched. Where wire ties are used, wood spacer blocks, whose length equals the finished thickness of
the wall, are placed between the faces of the form and removed as the concrete reaches their level. Wire ties hold the forms firmly against the spacer blocks. Formwork can also be made with lumber (tongue-and-groove or shiplap), supporting members and form ties. It can be built in sections and erected on site. Where the forms are higher than the top of the concrete pour, mark the desired elevation on the forms with chalk lines, pour strips or nails to indicate the desired concrete elevation.
37 Concrete formwork and combination form ties
wall thickness
break point reusable forms — plywood or other facing waler horizontal bracing diagonal brace if required form tie stake block anchor bolt cast-in-place concrete wall strip footing
the wall, are placed between the faces of the form and removed as the concrete reaches their level. Wire ties hold the forms firmly against the spacer blocks. Formwork can also be made with lumber (tongue-and-groove or shiplap), supporting members and form ties. It can be built in sections and erected on site. Where the forms are higher than the top of the concrete pour, mark the desired elevation on the forms with chalk lines, pour strips or nails to indicate the desired concrete elevation.
37 Concrete formwork and combination form ties
wall thickness
break point reusable forms — plywood or other facing waler horizontal bracing diagonal brace if required form tie stake block anchor bolt cast-in-place concrete wall strip footing
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