DE4223804A1 - Loose concrete reinforcement wire rods - has corrugated section with kinks along their length and having scored surfaces to bond with concrete - Google Patents

Abstract

The rod has a symmetrical corrugation along its length with a bend axis (KA) leading to a bent plane (k) on both sides equally. Scores (2) are shaped at the outer surface of the wire material (1), equidistant in relation to the longitudinal axis (X), at intervals of 1 - 2 mm. They are parallel to each other in at least two rows on opposite sides in progression along the length. The scores are at right angles to the longitudinal axis or pitched at an angle of up to 45 deg. to the axis. They have a width and depth of 0.05 - 0.1 mm and can be in a cross. USE/ADVANTAGE - For mouldable material with a length 10 70 mm and a max. dia. of 1.2 mm. Gives increased adhesion bonding with the concrete and increases its tensile and bending strength. Can be easily handled and scattered loosely into the material.

Description

The invention relates to a rod-shaped wire fiber made of metal for use in the reinforcement of malleable materials, especially concrete.

Steel wire fibers for reinforcing concrete have been around long known, in different configurations in Rod shape, corrugated shape evenly along the length, chip shape or also with surface profiling, such as in the magazine "Beton, 1989, Issue 4, pages 178 to 180" by Gerd Humert described "Steel wire fibers in practice". The Wire fibers preferably have a length of approximately 10 to 70 mm and a maximum diameter up to about 1.2 mm.

To increase the tensile strength and strength of the concrete is in particular adequate liability and anchoring of the Wire fibers required in the concrete. Here are a number of proposals. According to EP-PS 0130 191 wire fibers are corrugated evenly along their length, as well is published in Dutch patent application 8001609 stepped evenly alternately over their length (Right-angled corrugated) wire fiber proposed.

Wire fibers are also proposed in DE-OS 23 05 651, which either have a uniformly profiled surface Have longitudinal extension or in its entirety from the rod shape in other configurations, such as S-shape, O-shape, triangular shape,  Loops and the like are deformed to secure the anchor to improve in concrete. Also from the British patent 1446 855 are corrugated and formed with widened ends Wire fibers are known, also from US Pat. No. 2,677,955 Corrugations and the fiber in its entirety from the rod shape leading shape designed reinforcement fibers for Concrete.

To further improve the adhesion of the wire fibers was made of metal in concrete according to DE-GM 88 15 120 Reinforcing fiber in metal rod form proposed Surface is profiled by means of grooves. Furthermore was a further increase in the adhesiveness of wire fibers Metal in concrete, which is provided with surface profiles are achieved in that wire fibers present in rod form are bent at their ends, such as in the DE-GM 90 06 524 described.

The invention is based on the object of wire fibers Metal for the reinforcement of concrete to create one Allow further improvement of the adhesion in the concrete the strength and tensile strength and flexural tensile strength of the sun to improve reinforced concrete, but also at the same time good processability, d. H. Pourability, and if possible even distribution within the not yet hardened Allow concrete mass.

This task is accomplished by forming metal wire fibers achieved according to claim 1.

With the invention, a wire fiber is created on the one hand provides for a partial deformation of the fiber and on the other hand through a fine profiling at least in Parts of the surface further anchoring options creates. The wire fiber according to the invention is thus able in concrete, in which also with different grain sizes and Fineness of the aggregates is worked, improved Anchoring and liability through a differentiated design  enable. In addition, the wire fiber according to the invention along its length so that it is still easy to pour and evenly within the still flowable concrete mass can be distributed.

Advantageous embodiments of the invention are the characteristic features of the subclaims.

If initially from a wire fiber with a maximum Diameters up to about 1.2 mm are spoken here not only addressed circular cross sections of the wire fiber, but also oval or rectangular cross sections or approximately rectangular or similar cross-sections, the then maximum diameter refers to the maximum dimension.

The molded in the wire fiber along its length Kinks can be symmetrical with respect to their buckling direction or asymmetrical. The more the creases approach the triangular shape, the better the anchorage in Concrete. In the case of asymmetrical training, the should be by Buckling area created approximately a triangle with form the unevenly long sides with the kink angle.

According to the invention, the wire fiber can hang over its entire length be evenly kinked or only with straight Wire fiber areas, d. H. still running in the articulation axis Wire fiber areas divided areas with kinks, be trained. The transitions in the buckling areas are preferably rounded, and the kinks close here Kink angle of about 150 to 70 °. The buckling height m the Kinks, measured either as the maximum depth of a kink or maximum distance of the bent longitudinal axis X of Wire fiber (amplitude) is preferably about the simple to double the diameter of the wire fiber.

The grooves are preferred at regular intervals from each other along the wire fiber in rows on each other opposite sides formed. When training the  Kinks over portions of the length of the wire fiber can either one with several kinks, especially at least three to four Kinked central area of the wire fiber is provided be or in addition to straight end and middle parts each two buckling areas, each with at least two to three Kinking, here a whole under a kink Buckling shaft should be understood.

The profiling of the wire fiber using the grooves is very good fine, the grooves on the surface of the are preferred Wire fiber at regular intervals of about 1 to 2 mm from each other and arranged parallel to each other, whereby they are vertical to oblique at an angle α of up to 45 ° to Extend the longitudinal axis X of the wire fiber and a width of about 0.05 to 0.1 mm and a depth of about 0.05 to 0.1 mm exhibit. The scoring on two opposite one another Pages can be synchronized or offset against each other be arranged, in both cases either to each other parallel or with obliquely arranged grooves, if necessary also mirrored, d. H. in crossed planes, can be arranged. In addition, it is also possible to Compaction of the profiling the grooves in a cross shape to train. An advantageous embodiment of the wire fiber provides that through a wire with kinks and grooves Cut off in the middle of a bend is. In the case of wire fibers produced in this way, the ends are the Wire fibers are light on one side depending on the buckling shape angled and thus help to improve anchorage of the wire fibers in the concrete.

However, it is also possible to additionally bend the ends of the wire fibers, angled in the same direction or in opposite directions or rotated with respect to one another, the length of the bend being approximately one to four times the wire fiber diameter. Such additional bends also contribute to improving the anchoring and thus adhesion of the wire fibers in the concrete. The wire fibers are preferably made of a steel with a high strength of 1200 M / mm ² or more. Due to their at least two-fold deformation according to the invention, namely shaping of the kinks and profiling of the surface which overlap one another, the wire fiber is additionally strengthened and twisted, which acts to increase strength.

The wire fiber according to the invention by different methods be made, which also makes them different in design receives. The wire fiber can either be in two successive steps with the invention Shape, namely striations and creases, see characterizing features of claim 4 or in only one single process, see characterizing features of the claim 5. In the former case, the striae are aligned to each other with respect to the longitudinal axis through the deformation to Training of the kinks in these areas also shifted. In the latter case, the grooves remain in theirs molded parallel position.

The wire fiber according to the invention is produced for example by means of a pair of rollers, the surface of which as Male and female with creases and grooves in the desired one Configuration and dimensions are designed and synchronized are driven by gears and which have a pull-through gap form through which a wire made of metal, for example steel with a smooth surface and, for example, a circular cross section continuously drawn through and shaped accordingly becomes. After pulling through the pair of rollers, the Wire fibers in the desired length from the thus shaped Steel wire cut off, for example chopped off. At a appropriate training of the cleaver it is possible to additionally form a ridge on the cut edges that again an improved entanglement of the wire fiber in the concrete causes. According to this method, wire fibers are obtained at which the grooves in the direction of buckling and buckling plane vertical planes running across the wire fiber surface are formed, the groove depth also in the Kink directions extends.  

It is also possible to have two pairs of rollers in a row to be arranged so that the first pair of rollers covers the surface of the continuous wire profiled, d. H. the calls on two forms opposite sides and the second The pair of rollers forms the kinks. Here are the roller pairs accordingly on their surface with scoring or kinking as Male and female formed and form a nip, through which the wire is pulled. Here it is possible, the two pairs of rollers arranged one behind the other align that scoring and creasing in the same direction molded in, d. H. so all roller axes to each other are aligned in parallel, or the pairs of rollers with their Axes are arranged perpendicular to each other so that the grooves and kinks formed on different sides of the wire become. When scoring and kinking the Wire fiber in two successive processes, namely first the scoring and then the creasing, then the scoring is due to the bend in areas along the Wire fiber offset. It would also be conceivable to have a smooth one first Steel wire to be kinked when pulled through suitably trained pair of rollers, the kinks continuously or at intervals from each other or closed several can be formed, and then with a pair of rollers arranged perpendicular to this along the mutually parallel sides, d. H. parallel to the Forming crease directions, grooves.

The invention is based on the drawing Exemplary embodiments explained. Show it

Fig. 1 is a wire fiber in the side view in the plane of the bend directions P1, P2,

Fig. 2 partial section of the wire fiber according to Fig. 1 in an enlarged view without grooves,

Fig. 3 partial view of FIG. 1 in an enlarged scale;

Fig. 4 top view of the wire fiber according to Fig. 3,

Fig. 5 top view of a wire fiber in an enlarged schematic representation with grooves on the bend sides,

Fig. 6, 7 and 14 wire filaments with different bending training,

Fig. 8, 9 are schematic representations of various manufacturing methods for the manufacture of profiled and provided with buckling wire fibers

FIG. 10 view of a wire having grooves as precursor,

Fig. 11 enlargement of the detail D of Fig. 3,

Fig. 12 section CC of FIG. 11,

Fig. 13 section EE to Fig. 11.

In Fig. 1, a wire fiber made of a high tensile strength steel is shown enlarged by about 30%, which has a length of 55 mm with a diameter of 1.0 mm in natural size. Wire fibers, preferably in lengths of 30 to 60 mm with diameters of usually 1.0 mm, are used for the reinforcement of concrete, into which they are mixed in evenly when the concrete is still flowing. The wire fiber according to FIG. 1 is evenly provided with bends 3, 4 , which form a buckling shaft, over its length, in the buckling directions P1, P2, which form the buckling plane K. In addition, the surface of the wire fiber is additionally provided with fine grooves 2 , which are arranged next to one another in parallel at a short distance.

The formation of the folds 3, 4 of the wire fiber 1 is explained with reference to FIG. 2. The kinks 3 , 4 preferably run symmetrically to the kink axis KA with the same deflections, the maximum deflection m corresponding approximately to one to two times the diameter d of the wire fiber. In addition to the mirror symmetry both about the articulation axis KA and about the axis Z lying vertically in the articulation directions P1, P2, which runs through an apex of the articulation, a formation of the articulations, mirror-symmetrically rotated by 180 °, can also be provided, ie both symmetry with legs of the same length L1, L2 of a buckling as well as with legs of the same length L1, L2. The longitudinal axis X of the wire fiber then runs according to the kinks. The top and bottom 10 , 11 of the wire fiber 1 denote the sides of the wire 1 which are perpendicular to the bending direction P1, P2, ie if they have not yet been bent out. The sides of the wire 1 running parallel to the bending directions P1, P2 are designated 12 and 13 , respectively. In the case of round wires, ie wires with circular cross sections, the sides then correspond to the corresponding surface areas. The kink angle β of a kink can be obtuse or acute, preferably in the range from 100 to 140 °.

The wire fibers can either be formed evenly over their entire length with kinks 3 , 4 , see FIG. 1, or else only in parts over their length, as shown schematically in FIGS. 6, 7 and 14. In the example according to FIG. 6, the wire fiber 1 is provided with kinks 3 , 4 only in its central region, which are preferably formed either symmetrically or mirror-symmetrically rotated by 180 ° with respect to the kink axis KA. The end regions 5 , 6 of the wire fiber preferably extend again in the kink axis KA and are straight, with, for example, about two thirds to half the length of the wire fiber 1 being provided with kinks 3 , 4 and the remaining part approximately evenly on the straight end regions 5.6 distributed.

In the exemplary embodiment according to FIG. 7, the wire fiber 1 has two corrugated regions which extend between a straight middle piece 7 and straight end regions 5 , 6 , the straight parts 5 , 6 , 7 extending essentially along the kink axis KA. The wire fiber shown in FIG. 7 is symmetrical about its vertical central axis Z. However, it is also possible to make them mirror-symmetrical to the vertical axis Z by 180 °.

In the exemplary embodiment according to FIG. 14, the wire fiber 1 is provided with kinks 3 , 4 in its central region 8 , to which short straight pieces 9 a, 9 b, which extend approximately along the kink axis KA, are connected, followed in turn by kinks 3 a, 3 b, which merge into straight end pieces 5 , 6 , which in turn extend in the kink axis KA.

All wire fibers according to the invention are with kinks in the essentially an angled course with rounded Have transitions, trained and in addition to their through Buckling caused deformation along its length with a fine profiling on parts of the Wire fiber surface equipped. The rough profiling in Shape of the bends and the fine profile in shape of grooves results in increased liability and anchoring of the Wire fibers in concrete, while still good processable, d. H. pourable and redistributable in the still flowable and not yet hardened concrete mass.

The grooves 2 on the surface of the wire fibers, which are only indicated schematically in FIGS . 6, 7 and 14, can be formed at different locations, depending on the method of manufacturing the wire fiber surface.

In Fig. 3 is shown in a schematic enlargement of the view of FIG. 1 that the grooves extend along the sides 12, 13 of the wire fiber 1 . When looking at the wire fiber according to FIG. 3, there is, in principle, a sight as shown in FIG. 4. However, it is also possible, as shown in principle in FIG. 5, to mold the grooves on the top and bottom 10 , 11 of the wire fiber 1 according to FIG. 2. In the case of a round wire, the grooves formed on the top and bottom 10 , 11 also extend into the side regions 12 , 13 . Likewise, the grooves, which are formed in the side regions 12 , 13 according to FIG. 3, extend to the top and bottom with their ends. This overlap of the grooves in the other side areas depends essentially on the depth of impression of the grooves.

The arrangement and formation of the grooves can, as already carried out using different methods.

FIG. 8 schematically shows a method in which the wire fiber according to FIG. 1 is produced in two steps, for example. Here, two pairs of rollers 21 , 22 and 23 , 24 are arranged one after the other in the direction of production F, the roller axes being all aligned parallel to one another. Each pair of rollers forms a nip. Each pair of rollers is designed as a male and female according to the profile or shape to be created in the surface. In the example shown, the grooves 21 , 22 and the kinks 3 , 4 of the wire fibers according to the invention are to be produced with the rollers 23 , 24 . A smooth wire 1 c made of steel with a diameter of 1 mm is then first drawn in the direction of arrow F through the nip formed by the pair of rollers 21 , 22 and is superficially continuous on its surfaces in contact with the rollers Provide grooves 2 or cross grooves to the pulling direction F. The wire 1 b thus provided with grooves 2 , see also FIG. 10, in a schematic enlargement, is subsequently fed to the second pair of rollers 23 , 24 and is pulled through its roller gap with the corresponding kinks 3 , 4 in the desired configuration and arrangement, such as for example in FIG. 1, FIG. 6, FIG. 7 or FIG. 14, provided and leaves the second pair of rollers as an endless wire 1 a provided with kinks and grooves. Subsequently, the wire fiber 1 in the desired length is continuously divided from the shaped and profiled wire 1 a with a chopping knife 25 . In the case of roller pairs 21 , 22 and 23 , 24 arranged according to FIG. 8, which are driven synchronously by means of gearwheels, the grooves 2 essentially become, as shown in FIG. 5, on the top and bottom of the wire fiber transversely to the bending direction P1, P2 generated. In the subsequent formation of the kinks by the pair of rollers 23 , 24 , however, the grooves 2, in particular at the apex of the kinks and of the wire, are partially formed again and the grooves remain essentially in the regions running to the side.

However, it is also possible to make the grooves on the upper and lower sides stronger or to maintain their shape if, according to FIG. 8, only one pair of rollers is used, which as a male and female die is equipped with corresponding kinks as well as groove configurations .

A further possibility of obtaining grooves and kinks essentially in their entire shape can also be achieved in that, as shown in FIG. 9, the pair of rollers 21 , 22 producing the grooves with its roller axes perpendicular to that of the kinks 3 , 4 forming roller pair 23 , 24 is arranged, wherein first the grooves and then the kinks are molded into the smooth wire 1 c.

In FIGS. 11, 12 and 13 is the formation of the grooves 2 as shown in detail D of Fig. 3 or of the wire provided with grooves 1 b of FIG. Explained 10th The grooves 2 are formed on two opposite sides of the wire fiber 1 , either the top and bottom 10 , 11 and the sides 12, 13 in mutually parallel planes. The grooves 2 themselves are elongated and parallel to one another either perpendicular or obliquely to the longitudinal axis X of the wire fiber 11 . With their longitudinal axis Y they form an angle with the longitudinal axis X of the wire fiber, preferably between 90 and 45 °. The grooves represent a relatively fine profile of the surface of the wire fiber. As can be seen from the cross section according to FIG. 13, they extend in the case of a wire fiber 1 with a circular cross section over the respective apex into the side regions. When the formation of the wrinkle, ie, the buckling direction P1, P2, when forming the bends on the pre-existing marks on the top and bottom of the wire 1 b, see Fig. 8, is superimposed, the grooves are in turn further in these areas by the Deformation pressure flattened. Nevertheless, they extend into the side areas of the wire fiber. The width b of the grooves is preferably in the range from 0.05 to 0.1 mm, likewise their depth t in the range from 0.05 to 0.1 mm. The distance a between the grooves is preferably between 1 and 2 mm. The grooves are preferably continuous, ie formed as two parallel rows on two opposite sides of the wire fiber. The surface of the wire fiber is roughened by the grooves and the adhesion is significantly improved by the large number of grooves. It is also possible to form the grooves crossing one another, it also being possible for these crosses to be formed perpendicularly or obliquely to the longitudinal axis X of the wire fiber 1 . The grooves on the top and bottom are preferably parallel to and opposite one another, as shown in FIG. 12, but other arrangements are also possible.

Claims (14)

1. Rod-shaped wire fiber made of metal for use in the reinforcement of formable materials, in particular concrete, a length of about 10 to 70 mm, a maximum diameter of up to about 1.2 mm, which is distributed over its length in a kink plane (K) a kink axis (KA) has wavy, uniform bends on both sides and molded grooves ( 2 ) spaced apart from one another by about 1 to 2 mm in the surface of the wire fiber ( 1 ) with respect to its longitudinal axis (X), which are arranged in parallel rows formed in at least two continuous opposite sides of the wire fiber. 2. wire fiber according to claim 1, characterized in that the grooves ( 2 ) extend vertically to obliquely at an angle α up to 45 ° to the longitudinal axis (X) of the wire fiber and a width (b) of about 0.05 to 0, 1 mm and have a depth (t) of about 0.05 to 0.1 mm. 3. Wire fiber according to one of claims 1 to 2, characterized in that the grooves ( 2 ) are formed in a cross shape ( 4 ). 4. Wire fiber according to one of claims 1 to 3, characterized by a production of the wire fiber ( 1 ) in such a way that a smooth wire ( 1 c) is profiled in a first step by forming grooves ( 2, 4 ) and the profiled wire (1 b) in a second step at least partially uniformly with respect to the longitudinal axis (X) of the wire fiber wave-shaped through the formation of wrinkles (3, 4) is deformed on both sides, wherein the bends (3, 4) in a bending plane ( K) are arranged evenly to the articulation axis (KA). 5. Wire fiber according to one of claims 1 to 3, characterized by a production of the wire fiber in such a way that grooves ( 2, 4 ) and kinks ( 3 , 4 ) are formed simultaneously in a smooth wire ( 1 c). 6. Wire fiber according to one of claims 1 to 5, characterized in that the grooves ( 2, 4 ) in the perpendicular to the kink direction (P1, P2) and kink plane (K) planes ( 10, 11 ) are formed on the wire fiber. ( Fig. 5). 7. Wire fiber according to one of claims 1 to 5, characterized in that the grooves ( 2 , 4 ) in parallel to the bending direction (P1, P2) planes ( 12, 13 ) on the wire fiber ( 1 ) are formed. ( Fig. 3, 4). 8. Wire fiber according to one of claims 1 to 7, characterized in that the wire fiber ( 1 ) is provided uniformly continuously over its entire length with kinks ( 3 , 4 ). 9. Wire fiber according to one of claims 1 to 7, characterized in that the wire fiber ( 1 ) is provided with kinks ( 3 , 4 ) only in its central region and lateral straight lines extending essentially in the kink axis (KA) end regions ( 5 , 6 ). 10. Wire fiber according to one of claims 1 to 7, characterized in that the wire fiber ( 1 ) straight in the kink axis (KA) extending end regions ( 5, 6 ) and a straight in the kink axis (KA) extending central part ( 7 ) and between the end regions ( 5, 6 ) and the central part with regions formed around the articulation axis (KA) evenly on both sides of the articulations ( 3, 4 ). 11. Wire fiber according to one of claims 1 to 10, characterized in that the ends ( 5, 6 ) of the wire fiber ( 1 ) are additionally angled in the same direction or in the opposite direction or rotated relative to one another, the length of the bend being approximately one to four times the wire fiber diameter is. 12. Wire fiber according to one of claims 1 to 11, characterized in that the kinks ( 3 , 4 ) have rounded transitions and a kink angle β of approximately 150 to 70 °. 13. Wire fiber according to one of claims 1 to 12, characterized in that the kinks ( 3 , 4 ) have a buckling height (m) corresponding to the single to double diameter (d) of the wire fiber. 14. Wire fiber according to one of claims 1 to 13, characterized in that by the buckling created kink area approximately a triangle with unequal long sides with the bend angle β forms.