A Form Tie is an accessory used in formwork, used to hold the concrete wall forms firmly against the lateral pressure of freshly placed plastic concrete. They maintain equal space between the forms which results in uniform thickness of walls.
A form tie contains two parts namely internal tension member and external holding device. Removal of ties after complete hardening of concrete depends upon type of tie used. Some ties can be removable and some are not. Different types of form ties are listed below.
Threaded Tie contains a metal rod with is completely threaded from one end to the order end. It is fixed to the forms using nuts and washer on each end. It can be removed from hardened concrete if plastic sleeve is provided around it.
2. Snap Tie
Snap Tie is a single rod which ends contain enlarged button or loop to facilitate the use of suitable tie holders.
Plastic cones or metal washers or pins are attached to these ties to use them as form spreaders and also to prevent water leakage from concrete.
3. Loop Tie
Loop Tie is a single metal bar which ends are looped to provide sapce for locking system such as wedge and pin. There are also preferred for prefabricated modular form panels and for light duty purposes
4. Flat Tie
Flat Tie is a thin flat steel plate which contains hole at each end. These holes are used to lock the flat tie in forms using wedge and pin.
Full Tie and Nominal Tie for Aluminum Formwork System
X Flat Tie with Wedge Bolt for Steel Plywood Formwork System
There are also Coil Tie, Form Tie for Southeast Asia and Flat Tie for South Korea.
For all these wall ties, we also supply the various formwork accessories to suit the different form ties.
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