Tendon construction for posttensioning prestressed concrete and

Details Tendon construction for posttensioning prestressed concrete and Tendon construction for posttensioning prestressed concrete and

1982-11-29

1984-05-01

Watkins, Donald

Textiles: spinning, twisting, and twining

Strand structure

Covered or wrapped

57 7, 427409, D07B 116, D07B 114

Patent

active

044453213

ABSTRACT:
A tendon for use in posttensioning prestressed concrete comprising a multi-wire strand wherein individual peripheral abutting wires define an overall somewhat regular geometric cross-sectional strand configuration. The strand has both internal and external interstices wherein said external interstices are substantially fully filled with a dielectric plastic material such as a high molecular polyolefin material such as high density polyethylene. The plastic material forms a casement which completely surrounds the strand and forms a smooth outer surface having a circular cross-sectional configuration. A friction reducing grease-like material is coated on the outside of the casement and the entire structure thereafter enclosed in a plastic jacket. The above structure is formed by progressively extrusion coating the wire strand with the dielectric plastic, the thus coated strand with the grease-like material and the thus coated composite with plastic to form the jacket.

REFERENCES:
patent: 3646748 (1972-03-01), Lang
patent: 3885380 (1975-05-01), Hacker
patent: 3899384 (1975-08-01), Kelly
patent: 3922437 (1975-11-01), Kitta et al.
patent: 4123894 (1978-11-01), Hughes et al.
patent: 4125741 (1978-11-01), Wahl et al.

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