Global Patent Index - EP 1047924 A1

EP 1047924 A1 2000-11-02 - METHOD AND DEVICE FOR DETERMINING THE TENSILE OR COMPRESSIVE STRESS IN A FERRO-MAGNETIC MEMBER SUCH AS A PRESTRESSING, TENSION OR COMPRESSION ORGAN USED IN CIVIL ENGINEERING

Title (en)

METHOD AND DEVICE FOR DETERMINING THE TENSILE OR COMPRESSIVE STRESS IN A FERRO-MAGNETIC MEMBER SUCH AS A PRESTRESSING, TENSION OR COMPRESSION ORGAN USED IN CIVIL ENGINEERING

Title (de)

VERFAHREN UND VORRICHTUNG ZUR BESTIMMUNG VON ZUG- ODER DRUCKSPANNUNGEN IN EINEM FERROMAGNETISCHEN ELEMENT, INSBESONDERE EINEM SPANN-, ZUG- ODER DRUCKGLIED FÜR DAS BAUWESEN

Title (fr)

PROCEDE ET DISPOSITIF DE DETERMINATION DE CONTRAINTES DE TRACTION OU DE COMPRESSION DANS UN ELEMENT FERROMAGNETIQUE, NOTAMMENT UN ORGANE DE PRECONTRAINTE, DE TRACTION OU DE COMPRESSION DESTINE AU GENIE CIVIL

Publication

EP 1047924 A1 (DE)

Application

EP 98963345 A

Priority

  • DE 9803322 W
  • DE 19749907 A

Abstract (en)

[origin: WO9924803A1] The present invention relates to a method for determining the tensile or compressive stress in a ferro-magnetic member such as a prestressing, tension or compression organ used in civil engineering. This method comprises measuring directly or indirectly the following parameters in at least one given point of the magnetisation curve of the ferro-magnetic member: the intensity (H) of the magnetic field for a predetermined value of the magnetic flow (B) and/or the dependence of the magnetic flow (B) relative to the stress for a predetermined value of the magnetic field intensity (H) and/or the rise in the magnetisation curve for a predetermined value of the magnetic flow (B) or intensity (H) of the magnetic field. A calibration procedure is carried out for the material and/or the type of ferro-magnetic member which comprises calculating for the above-mentioned point(s) the dependence of the measured values relative to the stress for the respective and predetermined value of the magnetic flow (B) or intensity (H) of the magnetic field. The value of the tensile or compressive stress in the ferro-magnetic member or the modification thereof are calculated by comparing the value of the detected ranges with the assigned calibration dependence. This invention also relates to a device for realising this method.

IPC 1-7 (main, further and additional classification)

G01L 1/12

IPC 8 full level (invention and additional information)

G01L 1/12 (2006.01)

CPC (invention and additional information)

G01L 1/127 (2013.01); G01L 1/125 (2013.01)

Citation (search report)

See references of WO 9924803A1

Designated contracting state (EPC)

CH FR GB LI

EPO simple patent family

WO 9924803 A1 19990520; AU 1868399 A 19990531; DE 19749907 C1 19991014; EP 1047924 A1 20001102

INPADOC legal status


2001-12-12 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20010601

2000-11-02 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000509

2000-11-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): CH FR GB LI