What is P Cone , B Form tie (D cone, P-cone, Butterfly form Tie) in construction

P cone , D cone , Butterfly (B) form tie and tie bar use in form work in construction.

B cone , B form tie , D cone use in construction

B cone , B form tie , D cone use in construction

 

Where to use ? see image below

Butterfly form tie used in column formwork

Butterfly form tie used in column formwork

different types of form tie : Image source

different types of form tie : Image source

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