DE8911727U1 - Device for checking steel reinforcement in structures - Google Patents
Device for checking steel reinforcement in structuresInfo
- Publication number
- DE8911727U1 DE8911727U1 DE8911727U DE8911727U DE8911727U1 DE 8911727 U1 DE8911727 U1 DE 8911727U1 DE 8911727 U DE8911727 U DE 8911727U DE 8911727 U DE8911727 U DE 8911727U DE 8911727 U1 DE8911727 U1 DE 8911727U1
- Authority
- DE
- Germany
- Prior art keywords
- structures
- guide rail
- steel reinforcement
- sensors
- checking steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 10
- 239000010959 steel Substances 0.000 title claims description 10
- 230000002787 reinforcement Effects 0.000 title claims description 9
- 238000011156 evaluation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 244000309464 bull Species 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (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)
Description
Vorrichtung zur überprüfung von Stahibewehrungen in Bauwerken .Device for checking steel reinforcements in buildings.
Die Neuerung betrifft eine Vorrichtung zur Überprüfung von Stahlbewehrungen in Bauwerken.The innovation concerns a device for checking steel reinforcement in buildings.
Es ist bekannt, daß Stahlbev^hrungen ''.nsbesondere durch Korrosion in Bauwerken Risse und Brüche aufweisen können, die schwer abschätzbar oder voraussehbar sind, da eine Reihe von Faktoren einschließlich der bei der Herstellung angewendeten Verfahrensweisen zu einer früheren oder späteren Rißbf'dung führen. Wegen der Einsturzgefahr ist es dementspechend erforderlich, derartige Stahlbewehrungen ohne Beschädigung des Bauwerkes zu überprüfen. Es sind nun eine Reihe von Ver- r\ fahren bekannt, Brüche oder Risse in Spannstählen aufzuspüren, wozu auch Verfahren, die mit Röntgenstrahlen, Ultraschall oder Magnetfeldern arbeiten, zählen.It is known that steel reinforcements , particularly those caused by corrosion in buildings, can develop cracks and breaks which are difficult to estimate or predict, since a number of factors, including the manufacturing processes used, lead to earlier or later cracks. Because of the risk of collapse, it is therefore necessary to check such steel reinforcements without damaging the building. A number of methods are now known for detecting breaks or cracks in prestressing steels, including methods using X-rays, ultrasound or magnetic fields.
Gemäß der vorliegenden Neuerung soll nun eine preiswerte Vorrichtung zur überprüfung von Stahlbewehrungen in Bauwerken vorgeschlagen werden, welche mit Magnetfeldern arbeitet.According to the present innovation, an inexpensive device for checking steel reinforcements in buildings is now to be proposed, which works with magnetic fields.
Die Lösung der Aufgabe ergibt sich aus dem Kennzeichen des Anspruches 1. Die Unteransprüche beschreiben bevorzugte Ausführungsformen. The solution to the problem arises from the characterizing part of claim 1. The subclaims describe preferred embodiments.
Die beiliegenden Zeichnungen dienen der weiteren Erläuterung der Neuerung. Es zeigen:The attached drawings serve to further explain the innovation. They show:
Ein Schlitten 1, welcher einen nicht dargestellten Schrittmotor enthält, gleitet auf einer Laufschiene 2. Der Schlitten enthält mehrere Magnetfeldgeber 3 und mindestens drei FeIdplattendifferentialfühler als Magnetfeldsensoren, denen ein < Operationsverstärker 6 zugeordnet ist. Der Operationsverstär-A carriage 1, which contains a stepper motor (not shown), slides on a guide rail 2. The carriage contains several magnetic field sensors 3 and at least three field plate differential sensors as magnetic field sensors, to which an < operational amplifier 6 is assigned. The operational amplifier
f &Ggr;\ ker 6 ist mi tte Is eines Kabels 7 mi t einer Auswerteeinrichtung &iacgr; verbunden, die einen mobilen PC 8 enthält. Weiterhin enthält die Auswerteeinrichtung einen nicht dargestellten Drucker, welcher eine graphische Auswertung der Widerstandsänderungen der Feldplattendifferentialfühle/ in Abhängigkeit von der &iacgr; Bewegung des Schlittens 1 auf der Laufschiene 2 ermöglicht.The sensor 6 is connected by means of a cable 7 to an evaluation device 8 which contains a mobile PC 8. The evaluation device also contains a printer (not shown) which enables a graphic evaluation of the resistance changes of the field plate differential sensors as a function of the movement of the carriage 1 on the guide rail 2.
Die Laufschiene 2 trägt noch eine optisch, elektronisch oder magnetisch ablesbare Skalierung, welche ebenfalls graphisch ausgedruckt wird.The guide rail 2 also has an optically, electronically or magnetically readable scale, which is also printed out graphically.
Die Laufschiene 2 wird nun unterhalb einer zu prüfenden Betondecke 11 angeordnet, wobei die Stahlbewehrungen in der Betondecke bei der Verschiebung des Schlittens 1 überprüft werden.The guide rail 2 is now arranged beneath a concrete ceiling 11 to be tested, whereby the steel reinforcements in the concrete ceiling are checked when the carriage 1 is moved.
Der in der Fig. 2 dargestellte graphische Ausdruck zeigt durch das Ansteigen des Spannungswertes einen Bruch bei 12 und einen Anriß bei 13.The graphical expression shown in Fig. 2 shows a fracture at 12 and a crack at 13 due to the increase in the stress value.
Die Streufelder um die Stahlbewehrungen bewirken in den Differential - Feldplattensensoren eine Widerstandsänderung, welche eine Brückenschaltung aus dem Gl eichgewicht bringt. Die Spannungsdifferenz wird einem nachgeschalteten Operationsverstärker z.B. Siemens TAE H53 zugeführt. Der geringere Innenwiderstand der Feldplatten verhindert weitgehend eine Beeinflussung des hochempfindlichen Operationsverstärkers durch elektromagnetische Fremdfelder also durch Antennenwirkung .The stray fields around the steel reinforcements cause a resistance change in the differential field plate sensors, which brings a bridge circuit out of balance. The voltage difference is fed to a downstream operational amplifier, e.g. Siemens TAE H53. The lower internal resistance of the field plates largely prevents the highly sensitive operational amplifier from being influenced by external electromagnetic fields, i.e. by antenna effects.
• ♦ · &phgr;•♦ · ϕ
SC SiSs SS-SC SiSs SS-
7 :*7 :*
zierende Transistör scha 1tung die Signaländerung. Damit wird der Meßwert von jeder Drift unabhängig.transistor circuit 1 the signal change. This makes the measured value independent of any drift.
Claims (2)
dadurch gekennzeichnet,2. Device according to claim 1,
characterized,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8911727U DE8911727U1 (en) | 1989-10-02 | 1989-10-02 | Device for checking steel reinforcement in structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8911727U DE8911727U1 (en) | 1989-10-02 | 1989-10-02 | Device for checking steel reinforcement in structures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE8911727U1 true DE8911727U1 (en) | 1990-03-15 |
Family
ID=6843370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE8911727U Expired - Lifetime DE8911727U1 (en) | 1989-10-02 | 1989-10-02 | Device for checking steel reinforcement in structures |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE8911727U1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4027020A1 (en) * | 1990-08-27 | 1992-03-05 | Heinrich Liebig Gmbh | Detecting presence of metal reinforcement near bore in concrete - introducing probe generating magnetic or EM field and sensor measuring change in strength |
| DE4243878A1 (en) * | 1992-12-23 | 1994-07-07 | Suspa Spannbeton Gmbh | Monitoring device for components, in particular for tension members of ground or rock anchors, pressure members of piles, tendons for prestressed concrete structures and bridge cables |
-
1989
- 1989-10-02 DE DE8911727U patent/DE8911727U1/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4027020A1 (en) * | 1990-08-27 | 1992-03-05 | Heinrich Liebig Gmbh | Detecting presence of metal reinforcement near bore in concrete - introducing probe generating magnetic or EM field and sensor measuring change in strength |
| DE4243878A1 (en) * | 1992-12-23 | 1994-07-07 | Suspa Spannbeton Gmbh | Monitoring device for components, in particular for tension members of ground or rock anchors, pressure members of piles, tendons for prestressed concrete structures and bridge cables |
| US5545987A (en) * | 1992-12-23 | 1996-08-13 | Suspa Spannbeton Gmbh | Monitoring device for tension members of soil or rock anchors, compression members of poles, prestressing elements for prestressed concrete structures and bridge cables |
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