WO1995002099A1 - Armierung für zugbelastete bauteile und damit versehene anlagen - Google Patents
Armierung für zugbelastete bauteile und damit versehene anlagen Download PDFInfo
- Publication number
- WO1995002099A1 WO1995002099A1 PCT/DE1994/000788 DE9400788W WO9502099A1 WO 1995002099 A1 WO1995002099 A1 WO 1995002099A1 DE 9400788 W DE9400788 W DE 9400788W WO 9502099 A1 WO9502099 A1 WO 9502099A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reinforcement
- magnetization
- components
- prestressing
- elements
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
Definitions
- the invention relates to reinforcements for tensile-stressed components or system parts, which are characterized by magnetization, in particular saturation magnetization (remanent magnetization). 5
- Such reinforcements can be used for any tensile systems such as bridges, tunnels, concrete ceilings, conveyor belts or the like. from any building materials such as plastic, concrete, etc.
- prestressed concrete buildings with prestressing steel are seen as a particularly important application, which is why the following description largely refers to them.
- Magnetized reinforcements of this type permit low-interference monitoring of the integrity of buildings, systems, etc., which are equipped with them, by means of non-destructive test methods based on magnetic field measurements.
- the magnetization of the prestressing steel together with or 0 without the cladding tube takes place before the installation in the structures or system parts to be reinforced and can already be carried out by the manufacturer of the prestressing steel or can be brought about on site at the construction site immediately before the installation. 5
- the magnetization is carried out in a manner known per se with the aid of appropriately dimensioned and wound coils with a power supply unit for controllable power supply and
- prestressed concrete structures The stability of prestressed concrete structures is largely determined by the integrity of the prestressing reinforcement.
- High-strength steels which are used as prestressing steels, can break due to stress corrosion cracking without notice.
- Spare sheet is imprinted, which may be followed by a demagnetization of the slack reinforcement (DE-OS 40 37 992 and 40 37 993).
- the monitoring of the integrity of the prestressing elements of prestressed concrete structures is now made considerably easier and improved by magnetizing the prestressing elements before they are installed, since in this way there is no fear of magnetization being impeded by areas which are difficult to access (even a preference for particularly important reinforcement elements being provided could).
- the pre-magnetization of the prestressing steels appears appropriate - regardless of the type of use - in an immediate bond or with a cladding tube. In the latter case, magnetization can take place together with the cladding tube (in particular depending on the cladding material), but preference is given to magnetizing the prestressing steel before it is drawn into the cladding tube.
- the subsequent monitoring of the prestressing steels within the prestressed concrete buildings or systems in the sense of the detection of individual fractures is also carried out in a known manner by means of recurrent magnetic field scanning when using pre-magnetized steels according to the invention.
- the pre-magnetization in the longitudinal direction can be achieved in a simple manner by passing the prestressing steels through a coil supplied with direct current.
- the inspection is carried out by measuring the magnetic field on the surface of the component. Fractures within the tension bundle are noticeable as an anomaly in the external field and can thus be corrected by magnetic field sensors.
- ER S ATZBLATT be tested.
- various magnetic field sensors sorted according to increasing sensitivity, for example Hall probes, forester probes, stationary SQUID with pickup coils, movable SQUID
- the magnetic field sensor is moved on the component surface with the aid of a suitable traversing and positioning device, and the signals are recorded and processed with data processing.
- FIG. 1 shows a measurement on a prestressing steel bundle with an outer diameter of 75 mm and 40 steels, whereby in the first case there is no fracture in the central steel and in the second case a broken and premagnetized steel with a distance the breakage area of 0.2 mm was inserted.
- the measurement was carried out using a stationary SQUID and movable pickup coils (distance between pickup coil and prestressing steel collar 300 mm).
- E RSA TZBLATT ferromagnetic elements eg stirrups
- stirrups E RSA TZBLATT ferromagnetic elements
Landscapes
- Architecture (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94920393A EP0739438A1 (de) | 1993-07-09 | 1994-07-07 | Armierung für zugbelastete bauteile und damit versehene anlagen |
US08/583,089 US5720140A (en) | 1993-07-09 | 1994-07-07 | Reinforcement for building elements under tension and installations provided therewith |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4322862.3 | 1993-07-09 | ||
DE4322862 | 1993-07-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995002099A1 true WO1995002099A1 (de) | 1995-01-19 |
Family
ID=6492325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1994/000788 WO1995002099A1 (de) | 1993-07-09 | 1994-07-07 | Armierung für zugbelastete bauteile und damit versehene anlagen |
Country Status (5)
Country | Link |
---|---|
US (1) | US5720140A (de) |
EP (1) | EP0739438A1 (de) |
CA (1) | CA2166489A1 (de) |
DE (1) | DE4423419A1 (de) |
WO (1) | WO1995002099A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103954415A (zh) * | 2014-04-21 | 2014-07-30 | 广西交通科学研究院 | 测量旱桥挠度的方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19631490C2 (de) * | 1996-08-03 | 1998-06-10 | Forschungszentrum Juelich Gmbh | Vorrichtung und Verfahren zur Unterdrückung von Signalen der Querbügel bei der Untersuchung von Spannbetonbauteilen mit der Methode der magnetischen Restfeldmessung |
EP2062039A4 (de) * | 2006-09-01 | 2012-05-02 | Commw Scient Ind Res Org | Verfahren und vorrichtung zur signalisolierung |
JP6305847B2 (ja) * | 2014-06-26 | 2018-04-04 | 株式会社四国総合研究所 | 非破壊検査方法および非破壊検査装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1284609B (de) * | 1965-12-28 | 1968-12-05 | Ekkehard Dr | Verfahren zum Aufbringen von Zusatzkraeften zur UEberwindung von Reibungskraeften beim Spannen von Spanngliedern in Betonbauteilen |
US4573013A (en) * | 1982-03-29 | 1986-02-25 | The United States Of America As Represented By The Secretary Of Transportation | Magnetic inspection of reinforcing steel rods in prestressed concrete |
FR2615226A1 (fr) * | 1987-05-15 | 1988-11-18 | Habermann Pierre | Dispositif de coffrage negatif incorporant au moins un element de parois souple, destine a la pose de fers de reprise d'angle, ou analogues |
WO1989012833A1 (en) * | 1988-06-23 | 1989-12-28 | Electric Power Research Institute, Inc. | Inhomogeneity detection system |
EP0376116A2 (de) * | 1988-12-29 | 1990-07-04 | Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann | Verfahren zur Ermittlung der Lage einer Bruchstelle eines Spannstahls |
EP0506605A1 (de) * | 1991-02-02 | 1992-09-30 | HILTI Aktiengesellschaft | Einrichtung zum Auffinden magnetisierbaren Materials in Bauwerken |
EP0529181A2 (de) * | 1991-08-28 | 1993-03-03 | Nishimatsu Construction Co., Ltd. | Methode und Gerät zum Auffinden von Stahlarmierungen in Beton |
-
1994
- 1994-07-06 DE DE4423419A patent/DE4423419A1/de not_active Withdrawn
- 1994-07-07 US US08/583,089 patent/US5720140A/en not_active Expired - Fee Related
- 1994-07-07 CA CA002166489A patent/CA2166489A1/en not_active Abandoned
- 1994-07-07 WO PCT/DE1994/000788 patent/WO1995002099A1/de not_active Application Discontinuation
- 1994-07-07 EP EP94920393A patent/EP0739438A1/de not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1284609B (de) * | 1965-12-28 | 1968-12-05 | Ekkehard Dr | Verfahren zum Aufbringen von Zusatzkraeften zur UEberwindung von Reibungskraeften beim Spannen von Spanngliedern in Betonbauteilen |
US4573013A (en) * | 1982-03-29 | 1986-02-25 | The United States Of America As Represented By The Secretary Of Transportation | Magnetic inspection of reinforcing steel rods in prestressed concrete |
FR2615226A1 (fr) * | 1987-05-15 | 1988-11-18 | Habermann Pierre | Dispositif de coffrage negatif incorporant au moins un element de parois souple, destine a la pose de fers de reprise d'angle, ou analogues |
WO1989012833A1 (en) * | 1988-06-23 | 1989-12-28 | Electric Power Research Institute, Inc. | Inhomogeneity detection system |
EP0376116A2 (de) * | 1988-12-29 | 1990-07-04 | Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann | Verfahren zur Ermittlung der Lage einer Bruchstelle eines Spannstahls |
EP0506605A1 (de) * | 1991-02-02 | 1992-09-30 | HILTI Aktiengesellschaft | Einrichtung zum Auffinden magnetisierbaren Materials in Bauwerken |
EP0529181A2 (de) * | 1991-08-28 | 1993-03-03 | Nishimatsu Construction Co., Ltd. | Methode und Gerät zum Auffinden von Stahlarmierungen in Beton |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103954415A (zh) * | 2014-04-21 | 2014-07-30 | 广西交通科学研究院 | 测量旱桥挠度的方法 |
Also Published As
Publication number | Publication date |
---|---|
US5720140A (en) | 1998-02-24 |
CA2166489A1 (en) | 1995-01-19 |
EP0739438A1 (de) | 1996-10-30 |
DE4423419A1 (de) | 1995-01-12 |
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