Tendon, prestressed concrete structure and manufacturing method thereof

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By using high-strength PC steel wires with spiral-wrapped adhesive bonding for additional members, the tension material improves gripping force and reduces slippage in prestressed concrete columns, addressing the issue of delayed fractures and enhancing load-bearing capacity.

JP7653476B2Active Publication Date: 2025-03-28HOKKAIDO ELECTRIC POWER COMPANY INC

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Patent Information

Application Number: JP2023127484
Authority / Receiving Office: JP · JP
Patent Type: Patents
Current Assignee / Owner
Filing Date: 2023-08-04
Publication Date: 2025-03-28
Estimated Expiration: 2043-08-04

Application Information

Patent Timeline

04 Aug 2023

Application

JP2023127484

28 Mar 2025

Publication

JP7653476B2

IPC: E04C5/08

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Application Domain

Building reinforcements

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AI Technical Summary

Technical Problem

Prestressed concrete columns face issues with slippage of PC steel wires on the concrete body due to the annual ring crystal surface arrangement, leading to potential delayed fractures and reduced gripping force.

Method used

A tension material is introduced, comprising high-strength PC steel wires with additional members bonded in a spiral-wrapped state using adhesive, which increases the surface unevenness and frictional resistance against the concrete body.

Benefits of technology

The solution enhances the gripping force of PC steel wires on the concrete body, reducing slippage and the risk of delayed fractures, while also improving the load-bearing capacity and manufacturing efficiency of prestressed concrete columns.

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Abstract

To provide a tendon used in a pre-stressed concrete structure and having improved gripping force of PC steel wires against a concrete body, a pre-stressed concrete structure comprising the tendon, and a manufacturing method of the same.SOLUTION: A tendon 3 embedded in a concrete body of a pre-stressed concrete column comprises a PC steel wire 3a and slippage prevention means provided in a peripheral area of at least one end side of the PC steel wire 3a to prevent the PC steel wire 3a from slipping relative to the concrete body. The slippage prevention means is an additional member 3b which is attached to a surface of the PC steel wire 3a and forms unevenness on the surface of the PC steel wire 3a.SELECTED DRAWING: Figure 2

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