Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1987-09-02
1989-09-26
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324519, 324522, 324525, 324 61R, 324 65R, 340604, G01R 3108
Patent
active
048703656
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for detection of mechanical defects at structural members being of fiber composite, the application of the process as well as a measuring device and an armour bar for realization the process.
E.g. for prestressed concrete construction it is known to use individual or bunches of armour bars and load-bearing fixtures being of fiber composite. The problem with such armour bars is that damages, breaks, and water effects cannot be detected, especially if the armour bars are not accessible after assembling. This can be the case with bunches of armour bars for prestressed concrete construction, pressed after stressing. In such bunches breaks of individual bars are not recognizable at the bunch end and the bunch anchorage respectively, and therefore breaks cannot be detected by common monitoring systems. Buch such defects reduce the safety of a constructional part. Only with a higher and possibly critical number of breaks in larger bunches the constructional part shows external reactions, e.g. as increased deflections or cracks. It is further not possible to find out a locally restricted water effect at highly stressed fiber composite bars, what is a special disadvantage. Such a water intake effect can result in a deterioration of highly stressed armour bars.
It is the purpose of the invention to show a process and an arrangement for realization of the process for an easy and simple detection of defects in armour bars and load-bearing fixtures of fiber composite with respect to their position.
According to the invention the problem is solved in that at least one pair of wires, fibers, bunch of fibers or bands of conductive material is lenghwise inserted in the fiber composite of the structural member and firmly joined with the fiber composite of full wire, fiber or band length, and that a source of weak-current is connected to the free wire fiber, or band ends and either the current conduction or the capacity is determined or the current conduction and the capacity are determined.
Further features of the invention in respect of the application of the process, the measuring device, and the armour bar for working of the process are described in the subclaims and illustrated below with reference to the drawings. It shows
FIG. 1 a measuring device with an armour bar in a schematic diagrammatic view,
FIG. 2a an armour bar in a cross-sectional view FIG. 2b a general arrangement of further contructions of an armour bar in a cross-sectional view,
FIG. 3 an armour bar in a diagrammatic to view,
FIG. 4a the arrangement of a pair of wires on the surface of an armour bar in an enlarged detail view,
FIG. 4b the arrangement of a single wire, a fiber or a bunch of fibers in the rim zone of an armour bar in an enlarged detail view,
FIG. 5 an armour bar with lengthwise graduated arranged pairs of wires in a diagrammatic figuration,
FIG. 6 an armour bar with a pair of wires constructed as a loop in a diagrammatic figuration,
FIG. 7 an armour bar with bands of wires arranged on the surface in a cross-sectional view.
The measuring device for detection of damages or breaks as well as water inlet effects at inaccessibly installed armour bars 2 of fiber composite is constructed as a sensor bar as well as a measuring instrument 7. The sensor bar is a common armour bar 2 with a pair 4 of wires 5, 6 inserted lenghtwise in the core 10 at bar production, e.g. at drawing from nozzles. Instead of the wires 5, 6 also bands, fibers, bunches of fibers, or conducting rovings e.g. made of glass fibers can be used. Further pairs 4 of wires 5, 6 or individual wires can be arranged in the rim zone of the cross-section or on the surface 9 of the armour bar 2 spaced apart (FIG. 1). In FIG. 2a and 2b respectively an armour bar 2 is shown diagrammatically in a cross-sectional view. In FIG. 2a pairs 4 of wires 4, 6 are arranged on the surface 9 of the armour bar 2. In the center of the core 10 a pair 4 of wires 5, 6 is also provided. FIG. 2b shows varations concerning the arrangement of pairs 4 of wires 5, 6 and individua
REFERENCES:
patent: 293775 (1884-02-01), Patterson
patent: 539939 (1895-05-01), Gharky
patent: 4265981 (1981-05-01), Campbell
patent: 4348635 (1982-09-01), Wright et al.
patent: 4480251 (1984-10-01), McNaughton et al.
Eisenzopf Reinhard J.
Miele Anthony L.
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