CN103669727B - Equal strength welding point column tie-bar - Google Patents
Equal strength welding point column tie-bar Download PDFInfo
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- CN103669727B CN103669727B CN201310697130.0A CN201310697130A CN103669727B CN 103669727 B CN103669727 B CN 103669727B CN 201310697130 A CN201310697130 A CN 201310697130A CN 103669727 B CN103669727 B CN 103669727B
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Abstract
The present invention discloses a kind of equal strength welding point column tie-bar, comprises the outer reinforcement of rectangular configuration, and outer reinforcement is an Integral Steel rib, after the orthogonal structure of Bending Processing, its two ends butt welding is connected; Giant's Butt Joint, T font welding point and cross welding point on stirrup; Three kinds of joints, adopt resistance crimping weldering welding, the degree of depth that two ends is pressed into mutually is greater than 50%, and plumb joint bidirectional stretch test pull-off force exceedes the reinforcement bar mother metal ultimate tension of outer reinforcement, and shear test pull-off force at least reaches 90% of mother metal ultimate tension; Equal strength welding point column tie-bar of the present invention, the degree of depth that two reinforcement bars are pressed into mutually, more than 50%, forms firmly syndeton; The average pull-off force of welding point reaches mother metal ultimate tension, even exceedes mother metal ultimate tension, and when mother metal ruptures, welding point is still complete; There is excellent mechanical property, be applied on concrete beam, post as stirrup, meet the needs of building.
Description
Technical field
The present invention relates to a kind of rectangular configuration stirrup of building field, especially equal strength welding point column tie-bar.
Background technology
Stirrup is one of material important in concrete structure, its effect in concrete structure mainly contain following some: 1, shearing resistance effect, stirrup, except directly bearing except shearing, also limits carrying out of diagonal crack widths indirectly, enhances the concrete aggregate interlocking force of belly; 2, the effect of main muscle lateral deformation, fixing vertical muscle position is limited; 3, concrete crushing strength and ductile deformation is improved; 4, the effect of structure lateral deformation that causes because of creep, physical change etc. of constraint, to prevent or to reduce longitudinal crack.
Just because of stirrup, there is above-mentioned effect, in concrete component, be widely used the stirrup of various structure, shape, to meet the requirement of building to concrete structure.At present at building engineering field, often through butt welding (termination, two ends of one or two reinforcing bar) between two reinforcing bars contacted with each other or intersect of stirrup, cross weldering (in the middle part of two reinforcing bars intersected), the welding manners such as T-shaped weldering (middle part of a reinforcing bar and the termination of other) are connected, the welding procedure adopted is resistance spot welding, object is only reinforcing bar location and fixes, the mutual compression distance of two identical reinforcing bars of diameter is generally no more than 30%, the final welding point formed of national standard " concrete structure welded reinforcement mesh sheet " regulation is through shear test, pulling force only needs to reach 70% of parent material of reinforcement rebar ultimate tension.For two not identical reinforcing bars of diameter, mutual compression distance is generally 18% ~ 25% of less bar diameter.Adopt the stirrup of this kind of resistance electric welding joint, its reinforcing bar intersection position formed welding point relevant mechanical performance index, well below parent material of reinforcement rebar, its welding point position is a weak link, relevant mechanical performance index is lower or very low, can not meet the needs of building.
The welding point formed due to reinforcing bar intersection position is correlated with mechanical performance index, well below parent material of reinforcement rebar.When this kind of welded net reinforcing bar is applied to floor, because compression distance is less, therefore affect depth of compression zone, unfavorable to reinforced concrete member; And this kind of welded net reinforcing bar is generally only applied to wall, the plate of building, can not be applied on concrete beam, post as stirrup, larger pressure effect can not be born, because its welding joint mechanical property is less demanding.
Summary of the invention
For the problems referred to above that prior art exists, the invention provides a kind of strength of welded joint equal with parent material of reinforcement rebar, or at least reach the equal strength welding point column tie-bar of strength of parent 90%.
To achieve these goals, the present invention adopts following technical scheme: a kind of equal strength welding point column tie-bar, comprises the outer reinforcement of rectangular configuration, and outer reinforcement is an Integral Steel rib, after the orthogonal structure of Bending Processing, its two ends butt welding is connected; It is characterized in that: the butt welding of described outer reinforcement two ends be welded to connect a little, form Butt Joint, in the outer reinforcement of rectangular configuration, be provided with some lateral tie limb bars and longitudinal stirrup limb bar, the two ends of stirrup limb bar are welded on two opposite side of outer reinforcement respectively, form T font welding point; The crosspoint of lateral tie limb bar and longitudinal stirrup limb bar, adopts the mode of welding to connect, forms cross welding point;
Described Butt Joint, adopt resistance crimping weldering welding, the degree of depth that two ends is pressed into mutually is greater than 80% of diameter D, and the lap length L of two terminations is (0.5-1.5) D, and the height H of Butt Joint is (1.0-1.2) D; Butt Joint bidirectional stretch test pull-off force exceedes the reinforcement bar mother metal ultimate tension of outer reinforcement;
Described T font welding point, adopt resistance crimping weldering welding, the diameter of stirrup limb bar is d, and outer reinforcement diameter D is more than or equal to the diameter d of stirrup limb bar, and the degree of depth P that one end of stirrup limb bar and outer reinforcement are pressed into mutually is greater than 50% of diameter d; T font welding point bidirectional stretch test pull-off force exceedes reinforcement bar mother metal ultimate tension, and shear test pull-off force at least reaches 90% of mother metal ultimate tension;
Described cross welding point, the degree of depth P that lateral tie limb bar and longitudinal stirrup limb bar are pressed into mutually is greater than 50% of diameter d, and the height H of cross welding point is (1.0-1.5) D; Cross welding point bidirectional stretch test pull-off force exceedes reinforcement bar mother metal ultimate tension, and shear test pull-off force at least reaches 90% of mother metal ultimate tension.
Further feature is: the degree of depth that described Butt Joint is pressed into mutually is equal with diameter D; The degree of depth P that described cross welding point is pressed into mutually is equal with diameter d.
The equal diameters of outer reinforcement and reinforcing bar limb bar.
Compared to existing technology, equal strength welding point column tie-bar of the present invention, tool has the following advantages:
1, the degree of depth that is mutually pressed into of two reinforcement bars is more than 50%, forms firmly syndeton;
2, through multi-drawing test, the average pull-off force of welding point reaches mother metal ultimate tension, even exceedes mother metal ultimate tension, and when mother metal ruptures, welding point is still complete;
3, through repeatedly shear test, the maximum pull-off force of welding point reaches 90% of mother metal ultimate tension;
4, through repeatedly bend test, there is not crackle in welding point Bend diameter 3D;
Welding point is substantially equal with the intensity of mother metal, has excellent mechanical property, is not only applied to the wall of building, plate, more can be applied on concrete beam, post as stirrup, meets the needs of building.
Accompanying drawing explanation
Fig. 1 is hooping structure schematic diagram of the present invention;
Fig. 2-1,2-2,2-3,2-4,2-5,2-6,2-7 are Butt Joint structural representations of the present invention;
Fig. 3-1,3-2,3-3,3-4,3-5,3-6 are the T-shaped welded joint structure schematic diagrames of the present invention;
Fig. 4-1,4-2,4-3,4-4,4-5,4-6,4-7,4-8 are cross welded joint structure schematic diagrames of the present invention.
Detailed description of the invention
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
As in Fig. 1, welded mesh sheet stirrup for concrete structure of the present invention, comprises the outer reinforcement 1 of rectangular configuration, outer reinforcement 1 is an Integral Steel rib, after the orthogonal structure of Bending Processing, its two ends butt welding is connected, obtains its outer field rectangular configuration; Its two ends be welded to connect a little, formed Butt Joint 2.The docking solder joint of outer reinforcement 1, should be placed in the medium position on the long limit of outer rectangular configuration, can not be mid point certainly.
In the outer reinforcement 1 of rectangular configuration, be provided with some lateral tie limb bars 3 and longitudinal stirrup limb bar 3, the two ends of stirrup limb bar 3 are welded on two opposite side of outer reinforcement 1 respectively, form T font welding point 4; The crosspoint of lateral tie limb bar 3 and longitudinal stirrup limb bar 3, adopts the mode of welding to connect, forms cross welding point 5; Described lateral tie limb bar 3 and longitudinal stirrup limb bar 3 and outer reinforcement 1, form net structure, form welded net stirrup.The quantity of horizontal and vertical stirrup limb bar 3, arrangement mode, spacing etc. each other, determine according to the concrete size of concrete component and technological requirement, the designing requirement according to concrete beam, concrete column is determined; Stirrup limb bar 3 is generally transverse horizontal or is longitudinally arranged vertically, and parallels or vertical with the limit of outer reinforcement 1.
As shown in Fig. 2-1 to 2-7, the Butt Joint 2 of equal strength welding point column tie-bar of the present invention, adopt resistance crimping weldering welding, the degree of depth that outer reinforcement 1 two ends is pressed into mutually is greater than 80% of outer reinforcement 1 diameter D, the lap length L of two terminations is (0.5-1.5) D, and the height H of Butt Joint 2 is (1.0-1.2) D; Butt Joint 2 bidirectional stretch test pull-off force exceedes the reinforcement bar mother metal ultimate tension of outer reinforcement 1, and shear test pull-off force at least reaches 90% of reinforcement bar mother metal ultimate tension.The degree of depth that two reinforcement bars are pressed into mutually, the concrete numerical value that can choose is: 0.55D, 0.6D, 0.65D, 0.7D, 0.75D, 0.8D, 0.85D, 0.9D, 0.95D, 1.0D, general after being greater than 0.8D, relevant mechanical performance index reaches or close to equal strength, if welding procedures etc. are chosen suitable, at more than 0.5D, just substantially to reach or close to equal strength.Welding point height H, the concrete numerical value that can choose is: 1.0D, 1.01D, 1.02D, 1.03D, 1.04D, 1.05D, 1.06D, 1.07D, 1.08D, 1.09D, 1.1D, 1.12D, 1.14D, 1.15D, 1.18,1.2D, and when H=1.0D, be more conducive to arrange, have more use value.
As shown in Fig. 2-1,2-2,2-3,2-4, two ends after a reinforcement bar bends, compression distance is equal with diameter D, the height H of welding point is equal with diameter D, the termination of two reinforcement bars is all pressed into mutually, the lap length L=D of two terminations, the weld seam 11 of welding point is straight line, is intersection.
Resistance of the present invention crimping butt welding technology, activities is divided into four sections: preheating, energising, pressurization welding and tempering, and corresponding welding current, weld interval, pressure are different with material according to bar diameter, and respective change.The present invention adopt resistance crimping butt welding, be not technical essential of the present invention, this area and technician can select relevant parameter to realize this technique, be not described in detail at this.
Resistance crimping butt operation process schematic representation of the present invention, two ends after the reinforcement bar of a diameter D is bent (or two be arranged in parallel, the termination of the reinforcement bar that diameter D is equal), arrange between two electrodes, according to bar diameter, the parameters such as the degree of depth of material and press-in, choose suitable electrical current (voltage), conduction time, the upset welding processes parameters such as pre-forging force, first preheating, energising makes two reinforcement bars melt in a short period of time (softening) again, higher pre-forging force acts on two electrodes, two electrodes remake two ends Australia boat (or on two reinforcement bars) being used in reinforcement bar, promote two terminations mutually draw close and be pressed into, the degree of depth that two terminations are pressed into mutually is greater than 80% of diameter D and stops pressurization after meeting technological requirement, then temper, improves the mechanical property of welding point.
As shown in Fig. 2-5,2-6,2-7, the performance tests such as bending resistance, shearing, tension are carried out to Butt Joint 2 of the present invention, Welded Joints 90-degree bent, result is at the fracture of welding region (being a bit larger tham the region of welding point lap length) nothing, cracking, crack appears on reinforcement bar mother metal, does not occur in Butt Joint 2 region; Result of the test is satisfaction very, shows that the mechanical performance indexs such as strength of welded joint of the present invention reach, even exceedes the index of correlation of mother metal, achieves equal strength welding, define equal strength welding point.
As shown in Fig. 3-1 to 3-6, the T-shaped welding point 4 of equal strength welding point column tie-bar of the present invention, the height H 2 that one end (link) and the mutual degree of depth P be pressed into of outer reinforcement 1 of stirrup limb bar 3 are greater than 50%, T font welding point 4 of diameter d is between 1.0D-(1.0D+0.5d); T font welding point 4 bidirectional stretch test pull-off force exceedes reinforcement bar mother metal ultimate tension, and shear test pull-off force at least reaches 90% of mother metal ultimate tension; The degree of depth P that two reinforcement bars are pressed into mutually, the concrete numerical value that can choose is: 0.55D, 0.6D, 0.65D, 0.7D, 0.75D, 0.8D, 0.85D, 0.9D, 0.95D, 1.0D, general after being greater than 0.5D, relevant mechanical performance index reaches or close to equal strength.Welding point height H, the concrete numerical value that can choose is: 1.0D, 1.05D, 1.10D, 1.15D, 1.20D, 1.25D, 1.30D, 1.35D, 1.40D, 1.45D, 1.50D, be 1.50D to the maximum; And when H=1.0D, stirrup limb bar 3 is all pressed in outer reinforcement 1, is more conducive to arrange, has more use value.
In Fig. 3-2, compression distance P is equal with diameter D, and the height H of welding point is equal with diameter D, and two reinforcement bars are all pressed into mutually.
The welding procedure of the T-shaped welding point 4 of the present invention, adopt resistance crimping weldering welding, by two of arranged crosswise in T shape reinforcement bars (outer reinforcement 1 and stirrup limb bar 3, arrange between two electrodes, according to bar diameter, the parameters such as the degree of depth of material and press-in, choose suitable electrical current (voltage), conduction time, the resistance crimping Welding parameters such as pressure, two reinforcement bars melt (softening) in a short period of time after powered up, on higher pre-forging force effect two electrodes, two electrodes act on two reinforcement bars again, promote two reinforcement bars mutually draw close and be pressed into.It is substantially identical with the welding procedure of Butt Joint 2, is not technical essential of the present invention, is not described further at this.
As shown in Fig. 3-5,3-6, the performance test such as bending resistance, tension is carried out to T-shaped welding point 4 of the present invention, Welded Joints 90-degree bent, result is at the fracture of welding region (being a bit larger tham the region of welding point lap length) nothing, cracking, crack appears on the reinforcement bar mother metal of T-shaped welding point 4, does not occur in T-shaped welding point 4 region; Result of the test is satisfaction very, shows that the mechanical performance indexs such as strength of welded joint of the present invention reach, even exceedes the index of correlation of mother metal, achieves equal strength welding, define equal strength welding point.
As shown in Fig. 4-1 to 4-8, the cross welding point 5 of equal strength welding point column tie-bar of the present invention, adopt resistance crimping weldering welding, the degree of depth P of lateral tie limb bar 3 and the mutual press-in of longitudinal stirrup limb bar 3 is greater than 50% of diameter d, and the height H of cross welding point 5 is (1.0-1.5) d; Cross welding point 5 bidirectional stretch test pull-off force exceedes reinforcement bar mother metal ultimate tension, and shear test pull-off force at least reaches 90% of mother metal ultimate tension.The degree of depth P that two stirrup limb bars are pressed into mutually, the concrete numerical value that can choose is: 0.55d, 0.6d, 0.65d, 0.7d, 0.75d, 0.8d, 0.85d, 0.9d, 0.95d, 1.0d, general after being greater than 0.5d, relevant mechanical performance index reaches or close to equal strength.Welding point height H, the concrete numerical value that can choose is: 1.0dD, 1.05d, 1.10d, 1.15d, 1.20d, 1.25d, 1.30d, 1.35d, 1.40d, 1.45d, 1.50d, and when H=1.0d, is more conducive to arrange, has more use value.
As in Fig. 4-2,4-3, compression distance P is equal with diameter d, and the height H of cross welding point 5 is equal with diameter d, and the reinforcement bar of lateral tie limb bar 3 and longitudinal stirrup limb bar 3 is all pressed into mutually.
As Fig. 4-4, in 4-5, the welding procedure of cross welding point 5 of the present invention, by two reinforcement bars (lateral tie limb bar 3 and longitudinal stirrup limb bar 3) arranged in decussation, arrange between two electrodes, according to bar diameter, the parameters such as the degree of depth of material and press-in, choose suitable electrical current (voltage), conduction time, the resistance crimping Welding parameters such as pressure, two reinforcement bars melt (softening) in a short period of time after powered up, on higher pre-forging force effect two electrodes, two electrodes act on two reinforcement bars again, promote two reinforcement bars mutually draw close and be pressed into, it is substantially identical with the welding procedure of Butt Joint 2, T-shaped welding point 4, is not technical essential of the present invention, is not described further at this.
As shown in Fig. 4-6,4-7,4-8, the performance tests such as bending resistance, shearing, tension are carried out to cross welding point 5 of the present invention, Welded Joints 90-degree bent, result is at the fracture of welding region (being a bit larger tham the region of welding point lap length) nothing, cracking, crack appears on the reinforcement bar mother metal of cross welding point 5, does not occur in cross welding point 5 region; Result of the test is satisfaction very, shows that the mechanical performance indexs such as strength of welded joint of the present invention reach, even exceedes the index of correlation of mother metal, achieves equal strength welding, define equal strength welding point.
Three kinds of welding points of stirrup of the present invention, Butt Joint 2, T-shaped welding point 4, cross welding point 5, applicant has done thousands of contrast tests, obtain a large amount of experimental datas, conclusion (of pressure testing) is: crimp welding condition by regulating resistance, make reinforcing bar compression distance about 30% time, the most multipotency of the maximum pull-off force of shear test reaches 70% of mother metal ultimate tension (value of thrust when namely mother metal is pulled off), and average pull-off force only can reach 50% of mother metal ultimate tension; Reinforcing bar compression distance is about 50% time, and the most multipotency of the maximum pull-off force of shear test reaches 90% of mother metal ultimate tension, and average pull-off force only can reach 70% of mother metal ultimate tension; Reinforcing bar compression distance is about 80% time, and the maximum pull-off force of shear test can exceed mother metal ultimate tension, and namely the reinforcement bar of two mother metals is pulled off, and welding point is not pulled off, and average pull-off force can reach 90% of mother metal ultimate tension.Welding point bidirectional stretch test pull-off force exceedes reinforcement bar mother metal ultimate tension, and shear test pull-off force at least reaches 90% of mother metal ultimate tension.
The equal strength welding point of stirrup of the present invention, welding point substantially equal with the intensity of mother metal (close), some index even exceedes mother metal, there is excellent mechanical property, not only be applied to the wall of building, plate, more can be applied on concrete beam, post as stirrup, meet the needs of building.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. an equal strength welding point column tie-bar, comprises the outer reinforcement (1) of rectangular configuration, and outer reinforcement (1) is an Integral Steel rib, after the orthogonal structure of Bending Processing, its two ends butt welding is connected; It is characterized in that: described outer reinforcement (1) two ends be welded to connect a little, formed Butt Joint (2);
In the outer reinforcement (1) of rectangular configuration, be provided with some lateral tie limb bars (3) and longitudinal stirrup limb bar (3), the two ends of stirrup limb bar (3) are welded on two opposite side of outer reinforcement (1) respectively, form T font welding point (4); The crosspoint of lateral tie limb bar (3) and longitudinal stirrup limb bar (3), forms cross welding point (5);
Described Butt Joint (2), adopt resistance crimping weldering welding, the degree of depth that two ends is pressed into mutually is greater than 80% of diameter D, and the lap length L of two terminations is (0.5-1.5) D, and the height H of Butt Joint (2) is (1.0-1.2) D; Butt Joint (2) tensile test pull-off force exceedes the reinforcement bar mother metal ultimate tension of outer reinforcement (1);
Described T font welding point (4), adopt resistance crimping weldering welding, the diameter of stirrup limb bar (3) is that d, D are more than or equal to d, and the degree of depth P that one end of stirrup limb bar (3) and outer reinforcement (1) are pressed into mutually is greater than 50% of d; The horizontal tensile test pull-off force of T font welding point (4) exceedes the reinforcement bar mother metal ultimate tension of outer reinforcement (1), and shear test pull-off force at least reaches 90% of stirrup limb bar (3) mother metal ultimate tension;
Described cross welding point (5), adopt resistance crimping weldering welding, the degree of depth P of lateral tie limb bar (3) and the mutual press-in of longitudinal stirrup limb bar (3) is greater than 50% of d; Cross welding point (5) bidirectional stretch test pull-off force exceedes reinforcement bar mother metal ultimate tension, and shear test pull-off force at least reaches 90% of mother metal ultimate tension.
2. equal strength welding point column tie-bar according to claim 1, is characterized in that: the degree of depth of described Butt Joint (2) press-in is mutually equal with diameter D; The degree of depth P that described cross welding point (5) is pressed into mutually is equal with diameter d.
3. equal strength welding point column tie-bar according to claim 1, is characterized in that: the equal diameters of outer reinforcement (1) and stirrup limb bar (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310697130.0A CN103669727B (en) | 2013-12-19 | 2013-12-19 | Equal strength welding point column tie-bar |
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| CN201310697130.0A CN103669727B (en) | 2013-12-19 | 2013-12-19 | Equal strength welding point column tie-bar |
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| CN103669727A CN103669727A (en) | 2014-03-26 |
| CN103669727B true CN103669727B (en) | 2016-04-13 |
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Families Citing this family (2)
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| CN106181011B (en) * | 2016-08-18 | 2018-06-08 | 中冶建工集团有限公司 | A kind of more limb stirrup processing methods of shear wall rectangle |
| CN106181010B (en) * | 2016-08-18 | 2018-06-08 | 中冶建工集团有限公司 | The more limb stirrup welders of shear wall rectangle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05272196A (en) * | 1992-03-24 | 1993-10-19 | Penta Ocean Constr Co Ltd | Reinforced concrete column for high axial force |
| JPH0871769A (en) * | 1994-09-09 | 1996-03-19 | Tokyu Constr Co Ltd | Method of fixing reinforcing bar for intersection |
| CN102251627A (en) * | 2011-04-27 | 2011-11-23 | 中冶建工集团有限公司 | Welded mesh sheet stirrup for concrete structure |
| CN202684313U (en) * | 2012-08-14 | 2013-01-23 | 中冶建工集团有限公司 | Rebar parallel lap joint electric resistance pressure welding forming electrode |
| CN203613720U (en) * | 2013-12-19 | 2014-05-28 | 中冶建工集团有限公司 | Constant-strength welding joint column stirrup |
-
2013
- 2013-12-19 CN CN201310697130.0A patent/CN103669727B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05272196A (en) * | 1992-03-24 | 1993-10-19 | Penta Ocean Constr Co Ltd | Reinforced concrete column for high axial force |
| JPH0871769A (en) * | 1994-09-09 | 1996-03-19 | Tokyu Constr Co Ltd | Method of fixing reinforcing bar for intersection |
| CN102251627A (en) * | 2011-04-27 | 2011-11-23 | 中冶建工集团有限公司 | Welded mesh sheet stirrup for concrete structure |
| CN202684313U (en) * | 2012-08-14 | 2013-01-23 | 中冶建工集团有限公司 | Rebar parallel lap joint electric resistance pressure welding forming electrode |
| CN203613720U (en) * | 2013-12-19 | 2014-05-28 | 中冶建工集团有限公司 | Constant-strength welding joint column stirrup |
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