CN102926320A - U-shaped variable-cross-section hot rolling reinforcing rib for bridge and production process thereof - Google Patents
U-shaped variable-cross-section hot rolling reinforcing rib for bridge and production process thereof Download PDFInfo
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- CN102926320A CN102926320A CN2012104677727A CN201210467772A CN102926320A CN 102926320 A CN102926320 A CN 102926320A CN 2012104677727 A CN2012104677727 A CN 2012104677727A CN 201210467772 A CN201210467772 A CN 201210467772A CN 102926320 A CN102926320 A CN 102926320A
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- 238000005098 hot rolling Methods 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 230000003014 reinforcing effect Effects 0.000 title abstract 6
- 238000005096 rolling process Methods 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 229910001566 austenite Inorganic materials 0.000 claims description 38
- 238000001953 recrystallisation Methods 0.000 claims description 38
- 238000005516 engineering process Methods 0.000 claims description 14
- 238000010304 firing Methods 0.000 claims description 14
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000005452 bending Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000002929 anti-fatigue Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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Abstract
The invention discloses a U-shaped variable-cross-section hot rolling reinforcing rib for a bridge. The U-shaped variable-cross-section hot rolling reinforcing rib comprises a rib baseplate and side wing plates arranged on two sides of the rib baseplate, wherein the top ends of the side wing plates are provided with folded edges extending outwards, and the thickness of the cross sections of the side wing plates is gradually reduced from the combination part of the side wing plates and the rib baseplate to the combination part of the side wing plates and the folded edges. The U-shaped reinforcing rib can be obtained through production processes of blank selection, heating, rolling and straightening. The hot rolling reinforcing rib adopts a variable cross section and has the advantages that the material utilization ratio is high, the cold bending process is omitted, and the production cost is low. The thickness of a web of the U-shaped reinforcing rib is gradually reduced from the bottom up, and the material can be saved under the condition that the modulus of the cross section are not influenced. The process is hot rolling, and the residual stress at corner parts is small, so that the fatigue resistance performance of the process is excellent.
Description
Technical field
The invention belongs to the metal manufacture field, relate to the rolling mill practice of section bar, especially a kind of bridge U-shaped ribs of variable cross-section hot rolling and production technology thereof.
Background technology
At present, domestic bridge steel box back, base plate generally adopt the U-shaped stiffening rib vertically to put more energy into, steel case beam inboard along bridge to being arranged in juxtaposition.The thickness of U rib determines that according to the top of supporting, base plate thickness length is general identical with steel case beam.Weld together by two one-sided fillet welds (among Fig. 1 shown in the h) and top, base plate, to increase the integral rigidity of steel case beam.Because the mechanical characteristic of bridge, stiffening rib not only will prevent the outer unstability of roof and floor face, but also to consider and the roof and floor effect that jointly bears immense pressure.In addition, owing to be subject to the repeated action of automotive wheels compressive load, the U angle of rib commissure at runway position and the corner of U-shaped rib two bottom sides (shown in the E among Fig. 1, the F) be fatigue cracking easily.Not only require to have very high rigidity, also require to have good anti-fatigue performance.
Usually, the U-shaped rib of bridge all is to adopt the hot rolled plate clod wash to form, and the U-shaped rib shortcoming of clod wash mainly contains: 1, the clod wash cost of production is high again by hot rolling; 2, the whole cross section of the U-shaped rib of clod wash such as is at wall thickness (among the Fig. 1 shown in a), and stock utilization is low; 3, because clod wash causes E among Fig. 1, F place to have larger residual stress (greater than 300Mpa), so that U-shaped rib unstability and fatigue behaviour reduce; 4, (a≤16mm), because of the restriction of thickness, the U angle of rib (h place among Fig. 1) is little with the top board contact area of bridge, and stress is concentrated easily, has potential safety hazard because clod wash is so that there is limitation in the thickness of U-shaped rib.
Summary of the invention
Technical problem to be solved by this invention just provides a kind of bridge U-shaped ribs of variable cross-section hot rolling and production technology thereof, and the present invention not only cost is low, and stock utilization is high, and it has good anti-fatigue performance.
For solving the problems of the technologies described above, the invention provides a kind of bridge U-shaped ribs of variable cross-section hot rolling, comprise rib base plate and the side wing that is arranged on rib base plate both sides, the top of described side wing is provided with outward extending folding flange, and the tranverse sectional thickness of described side wing begins upwards to dwindle gradually to its junction with the folding flange from the junction of itself and rib base plate.
Further, the shape of cross section of described folding flange triangle in obtuse angle.
Again further, the angle α between described folding flange and the side wing outer wall=135 ~ 150 °.
Again further, the thickness a=12 ~ 50mm of described rib base plate, described side wing and the junction thickness b=10 ~ 30mm that rolls over flange, the longitudinal size c=20 ~ 40mm of described folding flange, the transverse dimension d of described folding flange=20 ~ 80mm.
Again further, described side wing is the smoothed curve transition structure with the junction of folding flange.
The present invention also provides the production technology of a kind of described bridge with the U-shaped ribs of variable cross-section hot rolling, comprises the steps:
1) selects base: select rectangular bloom, blank cross dimensions 180mm * 200mm ~ 380mm * 480mm;
2) heating: begin heating from room temperature, be controlled at 80 ~ 400min heat time heating time, tapping temperature is controlled at 1200 ~ 1380 ℃;
3) rolling: rolling total passage is 14 ~ 20 times, and start rolling temperature is controlled at 1200 ~ 1380 ℃, and finishing temperature is controlled at 800 ~ 845 ℃;
4) aligning: at 60 ~ 100 ℃ of straightening temperature alignings, obtain the bridge U-shaped ribs of variable cross-section hot rolling.
As preferred version, described step 2) in, adopting the heat stepwise mode, the phase I firing rate is controlled at 5 ~ 10 ℃/m, is controlled at 20 ~ 40min heat time heating time; The second stage firing rate is controlled at 20 ~ 40 ℃/m, is controlled at 60 ~ 360min heat time heating time.
As preferred version, in the described step 3), adopt syllogic rolling, austenitic area, austenite recrystallization district and austenite non-recrystallization district successively, each regional rolling pass is not less than 4 times, and austenitic area rolling pass reduction ratio is controlled at 10 ~ 25%, accumulative total reduction ratio 〉=50%; Austenite recrystallization district rolling pass reduction ratio 5 ~ 10%, accumulative total reduction ratio 〉=30%; Austenite non-recrystallization district rolling pass reduction ratio is controlled at 26 ~ 30%, accumulative total reduction ratio 〉=50%.
Beneficial effect of the present invention is:
1) the U-shaped ribs of hot rolling of the present invention is variable cross-section, and its stock utilization is high and omitted the technique of clod wash, and its cost of production is low.
2) web of the U-shaped ribs of the present invention upwards reduces thickness gradually, in the situation that does not affect its section modulus, and can economical with materials.
3) technique of the present invention is hot rolling, and residual stress is very little at the position, turning, so its anti-fatigue performance is good.
4) product top and the bridge board contact area of the present invention's production are large, in conjunction with firmly, are difficult for unstability.5) the present invention is simple to operate, is beneficial to popularization.
Description of drawings
Fig. 1 is the U-shaped rib structure schematic diagram of prior art clod wash;
Fig. 2 is the bridge U-shaped ribs structural representation of variable cross-section hot rolling.
The specific embodiment
In order to explain better the present invention, further illustrate main contents of the present invention below in conjunction with specific embodiment, but content of the present invention not only is confined to following examples.
Embodiment 1:
Bridge comprises the steps: with the production technology of the U-shaped ribs of variable cross-section hot rolling
1) selects base: select rectangular bloom, blank cross dimensions 180mm * 200mm;
2) heating: begin heating from room temperature, be controlled at 80min heat time heating time, adopt the heat stepwise mode, the phase I firing rate is controlled at 10 ℃/m, is controlled at 20min heat time heating time; The second stage firing rate is controlled at 40 ℃/m, is controlled at 60min heat time heating time, and tapping temperature is controlled at 1200 ℃;
3) rolling: rolling total passage is 14 times, and start rolling temperature is controlled at 1200 ℃, and finishing temperature is controlled at 800 ℃; The employing syllogic is rolling, austenitic area, austenite recrystallization district and austenite non-recrystallization district successively, austenitic area, austenite recrystallization district and austenite non-recrystallization district, the rolling pass number is respectively 4,5,5 times, austenitic area rolling pass reduction ratio is controlled at 10 ~ 25%, accumulative total reduction ratio 〉=50%; Austenite recrystallization district rolling pass reduction ratio 5 ~ 10%, accumulative total reduction ratio 〉=30%; Austenite non-recrystallization district rolling pass reduction ratio is controlled at 26 ~ 30%, accumulative total reduction ratio 〉=50%.
4) aligning: at 60 ℃ of straightening temperature alignings, obtain the bridge U-shaped ribs of variable cross-section hot rolling.
The bridge obtained above U-shaped ribs of variable cross-section hot rolling, comprise rib base plate and the side wing that is arranged on rib base plate both sides, the top of described side wing is provided with outward extending folding flange, and the tranverse sectional thickness of described side wing begins upwards to dwindle gradually to its junction with the folding flange from the junction of itself and rib base plate.The shape of cross section of described folding flange is triangle in obtuse angle.Angle α between described folding flange and the side wing outer wall=135 °.
Bridge comprises the steps: with the production technology of the U-shaped ribs of variable cross-section hot rolling
1) selects base: select rectangular bloom, blank cross dimensions 250mm * 280mm;
2) heating: begin heating from room temperature, be controlled at 150min heat time heating time, adopt the heat stepwise mode, the phase I firing rate is controlled at 6 ℃/m, is controlled at 20min heat time heating time; The second stage firing rate is controlled at 40 ℃/m, is controlled at 60min heat time heating time, and tapping temperature is controlled at 1200 ℃;
3) rolling: rolling total passage is 14 times, and start rolling temperature is controlled at 1200 ℃, and finishing temperature is controlled at 830 ℃; The employing syllogic is rolling, austenitic area, austenite recrystallization district and austenite non-recrystallization district successively, austenitic area, austenite recrystallization district and austenite non-recrystallization district, the rolling pass number is respectively 5,6,5 times, austenitic area rolling pass reduction ratio is controlled at 10 ~ 25%, accumulative total reduction ratio 〉=50%; Austenite recrystallization district rolling pass reduction ratio 5 ~ 10%, accumulative total reduction ratio 〉=30%; Austenite non-recrystallization district rolling pass reduction ratio is controlled at 26 ~ 30%, accumulative total reduction ratio 〉=50%.
4) aligning: at 78 ℃ of straightening temperature alignings, obtain the bridge U-shaped ribs of variable cross-section hot rolling.
The bridge obtained above U-shaped ribs of variable cross-section hot rolling, comprise rib base plate and the side wing that is arranged on rib base plate both sides, the top of described side wing is provided with outward extending folding flange, and the tranverse sectional thickness of described side wing begins upwards to dwindle gradually to its junction with the folding flange from the junction of itself and rib base plate.The shape of cross section of described folding flange is triangle in obtuse angle.Angle α between described folding flange and the side wing outer wall=140 °.
Bridge comprises the steps: with the production technology of the U-shaped ribs of variable cross-section hot rolling
1) selects base: select rectangular bloom, blank cross dimensions 280mm * 380mm;
2) heating: begin heating from room temperature, be controlled at 250min heat time heating time, adopt the heat stepwise mode, the phase I firing rate is controlled at 8 ℃/m, is controlled at 30min heat time heating time; The second stage firing rate is controlled at 30 ℃/m, is controlled at 140min heat time heating time, and tapping temperature is controlled at 1250 ℃;
3) rolling: rolling total passage is 14 times, and start rolling temperature is controlled at 1200 ℃, and finishing temperature is controlled at 845 ℃; The employing syllogic is rolling, austenitic area, austenite recrystallization district and austenite non-recrystallization district successively, austenitic area, austenite recrystallization district and austenite non-recrystallization district, the rolling pass number is respectively 4,6,7 times, austenitic area rolling pass reduction ratio is controlled at 10 ~ 25%, accumulative total reduction ratio 〉=50%; Austenite recrystallization district rolling pass reduction ratio 5 ~ 10%, accumulative total reduction ratio 〉=30%; Austenite non-recrystallization district rolling pass reduction ratio is controlled at 26 ~ 30%, accumulative total reduction ratio 〉=50%.
4) aligning: at 65 ℃ of straightening temperature alignings, obtain the bridge U-shaped ribs of variable cross-section hot rolling.
The bridge obtained above U-shaped ribs of variable cross-section hot rolling, comprise rib base plate and the side wing that is arranged on rib base plate both sides, the top of described side wing is provided with outward extending folding flange, and the tranverse sectional thickness of described side wing begins upwards to dwindle gradually to its junction with the folding flange from the junction of itself and rib base plate.The shape of cross section of described folding flange is triangle in obtuse angle.Angle α between described folding flange and the side wing outer wall=145 °.
Bridge comprises the steps: with the production technology of the U-shaped ribs of variable cross-section hot rolling
1) selects base: select rectangular bloom, blank cross dimensions 380mm * 420mm;
2) heating: begin heating from room temperature, be controlled at 350min heat time heating time, adopt the heat stepwise mode, the phase I firing rate is controlled at 10 ℃/m, is controlled at 20min heat time heating time; The second stage firing rate is controlled at 35 ℃/m, is controlled at 300min heat time heating time, and tapping temperature is controlled at 1350 ℃;
3) rolling: rolling total passage is 20 times, and start rolling temperature is controlled at 1350 ℃, and finishing temperature is controlled at 830 ℃; The employing syllogic is rolling, austenitic area, austenite recrystallization district and austenite non-recrystallization district successively, austenitic area, austenite recrystallization district and austenite non-recrystallization district, the rolling pass number is respectively 6,6,8 times, austenitic area rolling pass reduction ratio is controlled at 10 ~ 25%, accumulative total reduction ratio 〉=50%; Austenite recrystallization district rolling pass reduction ratio 5 ~ 10%, accumulative total reduction ratio 〉=30%; Austenite non-recrystallization district rolling pass reduction ratio is controlled at 26 ~ 30%, accumulative total reduction ratio 〉=50%.
4) aligning: at 95 ℃ of straightening temperature alignings, obtain the bridge U-shaped ribs of variable cross-section hot rolling.
The bridge obtained above U-shaped ribs of variable cross-section hot rolling, comprise rib base plate and the side wing that is arranged on rib base plate both sides, the top of described side wing is provided with outward extending folding flange, and the tranverse sectional thickness of described side wing begins upwards to dwindle gradually to its junction with the folding flange from the junction of itself and rib base plate.The shape of cross section of described folding flange is triangle in obtuse angle.Angle α between described folding flange and the side wing outer wall=135 °.
Bridge comprises the steps: with the production technology of the U-shaped ribs of variable cross-section hot rolling
1) selects base: select rectangular bloom, blank cross dimensions 380mm * 480mm;
2) heating: begin heating from room temperature, be controlled at 400min heat time heating time, adopt the heat stepwise mode, the phase I firing rate is controlled at 5 ℃/m, is controlled at 40min heat time heating time; The second stage firing rate is controlled at 20 ℃/m, is controlled at 360min heat time heating time, and tapping temperature is controlled at 1380 ℃;
3) rolling: rolling total passage is 20 times, and start rolling temperature is controlled at 1380 ℃, and finishing temperature is controlled at 845 ℃; The employing syllogic is rolling, austenitic area, austenite recrystallization district and austenite non-recrystallization district successively, austenitic area, austenite recrystallization district and austenite non-recrystallization district, the rolling pass number is respectively 6,8,6 times, austenitic area rolling pass reduction ratio is controlled at 10 ~ 25%, accumulative total reduction ratio 〉=50%; Austenite recrystallization district rolling pass reduction ratio 5 ~ 10%, accumulative total reduction ratio 〉=30%; Austenite non-recrystallization district rolling pass reduction ratio is controlled at 26 ~ 30%, accumulative total reduction ratio 〉=50%.
4) aligning: at 100 ℃ of straightening temperature alignings, obtain the bridge U-shaped ribs of variable cross-section hot rolling.
The bridge obtained above U-shaped ribs of variable cross-section hot rolling, comprise rib base plate and the side wing that is arranged on rib base plate both sides, the top of described side wing is provided with outward extending folding flange, and the tranverse sectional thickness of described side wing begins upwards to dwindle gradually to its junction with the folding flange from the junction of itself and rib base plate.The shape of cross section of described folding flange (3) is triangle in obtuse angle.Angle α between described folding flange and the side wing outer wall=145 °.
The Performance Ratio of table 1 product
Claims (9)
1. a bridge is with the U-shaped ribs of variable cross-section hot rolling, comprise rib base plate (1) and be arranged on the side wing (2) on rib base plate (1) both sides, it is characterized in that: the top of described side wing (2) is provided with outward extending folding flange (3), and the tranverse sectional thickness of described side wing (2) begins upwards to dwindle gradually to its junction with folding flange (3) from the junction of itself and rib base plate (1).
2. bridge according to claim 1 is with the U-shaped ribs of variable cross-section hot rolling, and it is characterized in that: the shape of cross section of described folding flange (3) is triangle in obtuse angle.
3. bridge according to claim 2 is characterized in that: the angle α between described folding flange (3) and side wing (2) outer wall=135 ~ 150 ° with the U-shaped ribs of variable cross-section hot rolling.
According to claim 1 and 2 or 3 described bridges with the U-shaped ribs of variable cross-section hot rollings, it is characterized in that: the thickness a=12 ~ 50mm of described rib base plate (1), described side wing (2) and the junction thickness b=10 ~ 30mm that rolls over flange (3), longitudinal size c=20 ~ the 40mm of described folding flange (3), the transverse dimension d of described folding flange (3)=20 ~ 80mm.
According to claim 1 and 2 or 3 described bridges with the U-shaped ribs of variable cross-section hot rollings, it is characterized in that: described side wing (2) is the smoothed curve transition structure with the junction of folding flange (3).
6. bridge according to claim 4 is with the U-shaped ribs of variable cross-section hot rolling, and it is characterized in that: described side wing (2) is the smoothed curve transition structure with the junction of folding flange (3).
7. the production technology of the U-shaped ribs of the described bridge usefulness variable cross-section hot rolling of claim 1 comprises the steps:
1) selects base: select rectangular bloom, blank cross dimensions 180mm * 200mm ~ 380mm * 480mm;
2) heating: begin heating from room temperature, be controlled at 80 ~ 400min heat time heating time, tapping temperature is controlled at 1200 ~ 1380 ℃;
3) rolling: rolling total passage is 14 ~ 20 times, and start rolling temperature is controlled at 1200 ~ 1380 ℃, and finishing temperature is controlled at 800 ~ 845 ℃;
4) aligning: at 60 ~ 100 ℃ of straightening temperature alignings, obtain the bridge U-shaped ribs of variable cross-section hot rolling.
8. described bridge is with the production technology of the U-shaped ribs of variable cross-section hot rolling according to claim 7, and it is characterized in that: described step 2), adopt the heat stepwise mode, the phase I firing rate is controlled at 5 ~ 10 ℃/m, is controlled at 20 ~ 40min heat time heating time; The second stage firing rate is controlled at 20 ~ 40 ℃/m, is controlled at 60 ~ 360min heat time heating time.
According to claim 7 or 8 described bridges with the production technology of the U-shaped ribs of variable cross-section hot rollings, it is characterized in that: in the described step 3), the employing syllogic is rolling, austenitic area, austenite recrystallization district and austenite non-recrystallization district successively, each regional rolling pass is not less than 4 times, austenitic area rolling pass reduction ratio is controlled at 10 ~ 25%, accumulative total reduction ratio 〉=50%; Austenite recrystallization district rolling pass reduction ratio 5 ~ 10%, accumulative total reduction ratio 〉=30%; Austenite non-recrystallization district rolling pass reduction ratio is controlled at 26 ~ 30%, accumulative total reduction ratio 〉=50%.
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| CN201210467772.7A CN102926320B (en) | 2012-11-19 | 2012-11-19 | The U-shaped ribs of bridge variable cross-section hot rolling and production technology thereof |
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| CN201210467772.7A CN102926320B (en) | 2012-11-19 | 2012-11-19 | The U-shaped ribs of bridge variable cross-section hot rolling and production technology thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437278A (en) * | 2013-07-24 | 2013-12-11 | 广东省公路勘察规划设计院股份有限公司 | Variable-section U-shaped reinforcing rib structure of steel box girder roof of bridge |
| CN103437273A (en) * | 2013-08-23 | 2013-12-11 | 邢台路桥千山桥梁构件有限责任公司 | Method for machining bottom box used for assembly-type steel box composite beam |
| CN104625654A (en) * | 2015-02-12 | 2015-05-20 | 南京天润型钢有限公司 | Production method for unequal thickness U rib formation |
| CN105345399A (en) * | 2015-11-09 | 2016-02-24 | 江阴建禾钢品有限公司 | Manufacturing method of non-equal-thickness U rib |
| CN106180460A (en) * | 2016-07-05 | 2016-12-07 | 济钢集团有限公司 | The controlled rolling and controlled cooling of the U-shaped steel of a kind of variable cross-section and clod wash comprehensive shaping method |
| CN111495967A (en) * | 2020-04-30 | 2020-08-07 | 河北津西钢板桩型钢科技有限公司 | Hot-rolled thin-web and ultra-deep variable-section trapezoidal rib and hot continuous rolling production process thereof |
| CN112501511A (en) * | 2020-11-30 | 2021-03-16 | 武汉钢铁有限公司 | Steel for low internal stress bridge structure and production method thereof |
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| CN103437278A (en) * | 2013-07-24 | 2013-12-11 | 广东省公路勘察规划设计院股份有限公司 | Variable-section U-shaped reinforcing rib structure of steel box girder roof of bridge |
| CN103437273A (en) * | 2013-08-23 | 2013-12-11 | 邢台路桥千山桥梁构件有限责任公司 | Method for machining bottom box used for assembly-type steel box composite beam |
| CN103437273B (en) * | 2013-08-23 | 2015-06-17 | 邢台路桥千山桥梁构件有限责任公司 | Method for machining bottom box used for assembly-type steel box composite beam |
| CN104625654A (en) * | 2015-02-12 | 2015-05-20 | 南京天润型钢有限公司 | Production method for unequal thickness U rib formation |
| CN105345399A (en) * | 2015-11-09 | 2016-02-24 | 江阴建禾钢品有限公司 | Manufacturing method of non-equal-thickness U rib |
| CN106180460A (en) * | 2016-07-05 | 2016-12-07 | 济钢集团有限公司 | The controlled rolling and controlled cooling of the U-shaped steel of a kind of variable cross-section and clod wash comprehensive shaping method |
| CN111495967A (en) * | 2020-04-30 | 2020-08-07 | 河北津西钢板桩型钢科技有限公司 | Hot-rolled thin-web and ultra-deep variable-section trapezoidal rib and hot continuous rolling production process thereof |
| CN112501511A (en) * | 2020-11-30 | 2021-03-16 | 武汉钢铁有限公司 | Steel for low internal stress bridge structure and production method thereof |
| CN112501511B (en) * | 2020-11-30 | 2022-02-01 | 武汉钢铁有限公司 | Steel for low internal stress bridge structure and production method thereof |
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