Patent ID: 8418988
Filing Date: 2013-04-16
Classification: E04G

Abstract:
1. A formwork tie rod for use in a hardened concrete which said tie rod is formed by a threaded rod that includes threaded end portions and a middle threaded portion between said end portions, and which is provided, for removal from the hardened concrete, with a conical plastic sheath between the threaded end portions, said conical plastic sheath being connected form-fittingly to a thread of the threaded rod between the end portions, such that said threads form projections in said middle threaded portion and said plastic sheath is anchored to said middle threaded portion by penetration of said projections into said plastic sheath to prevent displacement of said plastic sheath in an axial direction extending along a length of said threaded rod, wherein the threaded rod is a hot-rolled threaded rod which has a yield point of at least 700 N/m 2 , and wherein the conicity of the plastic sheath is 0.5 to 2.5 mm per 100 mm of length of the plastic sheath.