CN103111789A - Steel crane beam fatigue and wreck reinforcing method - Google Patents
Steel crane beam fatigue and wreck reinforcing method Download PDFInfo
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- CN103111789A CN103111789A CN2013100397153A CN201310039715A CN103111789A CN 103111789 A CN103111789 A CN 103111789A CN 2013100397153 A CN2013100397153 A CN 2013100397153A CN 201310039715 A CN201310039715 A CN 201310039715A CN 103111789 A CN103111789 A CN 103111789A
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Abstract
The invention relates to a steel crane beam fatigue and wreck reinforcing method and belongs to the field of structural engineering. The steel crane beam fatigue and wreck reinforcing method comprises a crane beam, wherein cracks are formed on the crane beam, circular holes are arranged on the end portions of the cracks, two sides of one end surface of the crane beam or two sides of two end surfaces of the crane beam are respectively provided with inclined planes, V-shaped grooves are formed by two opposite inclined planes, weld joints are deposited in the V-shaped grooves, and the surfaces of the weld joints are at the same plane with the surface of crane beam parent metal. Usually, when local fatigue cracks exist on the steel crane beam, the cracks can quickly spread and penetrate, and accordingly load-bearing ability of the crane beam is lost. The circular holes are arranged on the end portions of the cracks. The two sides of the one end surface of the crane beam or the two sides of the two end surfaces of the crane beam are respectively provided with the inclined planes, and the V-shaped grooves are formed by the two opposite inclined planes, wherein the weld joints are deposited in the V-shaped grooves, and the surfaces of the weld joints are at the same plane with the surface of crane beam parent metal. Furthermore, angle iron is connected with a web and an upper flange through high-strength bolts, and the angle iron is symmetrically arranged at two sides of the web. The method reinforces the steel crane beam with fatigue and wreck, can restrain expansion of the cracks, and simply and effectively prolong service life of the steel crane beam.
Description
Technical field:
The present invention relates to a kind of steel crane beam fatigue rupture reinforcement means, belong to the Structural Engineering field.
Background technology:
At present, the application of steel crane beam is very extensive, due to design, installation, construction, also has the effect of dynamic load over a long time, causes the destruction probability of crane girder also greatly to increase.The principal mode of its destruction is to produce fatigue crack.It directly has influence on the performance of crane girder and the resistance to overturning of factory building, also has influence on the development of production efficiency and the national economy of factory.The main cause of its tired broken ring is the additional bending stress that eccentric load produces.After the crack appearred in the crane girder web, top flange and web just became two entities, and between them, the ability of co-ordination descends, and makes the part excess stress and local buckling occur.The reinforcing mode of steel crane beam has following scheme at present:
[1] Luo Bangfu, Wei Mingzhong, Shen Zuyan, Chen Minghui writes: " Steel Structural Design handbook, China Construction Industry Press, in October, 1989.
[2] kingdom week: " steel construction-principle and design ", publishing house of Tsing-Hua University in November, 1993.
[3] " Design of Reinforcement of steel construction ", " steel construction identify with reinforce collected works (two) ", Ministry of Metallurgical Industry Building Research General Institute architecture information research department, June nineteen ninety-five.
[4] Song Liansheng: " man-rate of certain factory's crane girder and reinforcing ", " industrial building " the 27th the 2nd phase of volume in 1997.
[5] " characteristics of crane girder Design of Reinforcement ", " steel construction identify with reinforce collected works (two) ", Ministry of Metallurgical Industry Building Research General Institute architecture information research department, June nineteen ninety-five.
[6] the dizzy foot of a hill or mountain of Lu: " the workshop steel crane beam use investigation and analysis of Shoudu Iron and Steel Co soaking pit ", " steel construction " second phase in 1992.
[7] " Welded Steel Crane upper area fatigue rupture special topic ", " steel construction " second phase in 1992.
[8] Hao Jiping, Chen Shaofan: " cripling of steel construction under cyclic load and the experimental study of low-cycle fatigue " " civil engineering journal " the 29th the 6th phase of volume in 1996.
[9] U.S.'s scheme:
The fatigue crack special hazard of crane girder is thought by the U.S., should in time eliminate, and the fatigue crack of welding crane girder has been done the test of three kinds of recovery scenarios:
(1) slot with carbon arc air gouging in the both sides, crack, then complete penetration;
(2) adopt the deep angle ribbed stiffener of 9.21 * 18.73cm;
(3) crack two tops brills are directly through the hole of 1. 27cm, and a hole is screwed into high-strength bolt, and another hole is empty, or two holes are empty.On the basis of analysis and research, proposing optimum restorative procedure is the carbon arc air gouging fluting, then complete penetration again.For the web crack, with arc air cutting fluting, and carry out repair welding, make weld metal filling fluting position, the welding of also slotting of the fracture back side is polished down to it with web highly equally after repair welding, then ribbed stiffener is welded in the top flange with the groove welding of complete penetration following.Check track centering situation, the web that must make track and beam is centering as far as possible.And gauge and crane wheelspan are adapted.For the note angle welding crack of the edge of a wing and web, also use air-arc cutting two sides fluting, reweld, and complete penetration, and the reparation of all weld seams all should be undertaken by " American Welding Society's standard ".
Repairing test proves, it is best that the crack is welded in the following anti-fatigue performance in top flange with air-arc cutting and manual welding, ribbed stiffener.
The shortcoming of this scheme technology:
A, difficulty of construction are larger, and cost is very high, and technology content requires high especially.
B, in the crane running, be difficult to guarantee the centering as far as possible of track and web.
C, when welding, easily web primary fracture place is produced residual stress, can not get a desired effect.
Summary of the invention
The object of the present invention is to provide a kind of reinforcing mode simply, the reinforcement means of steel crane beam fatigue rupture safely and effectively.
Technical solution:
Steel crane beam fatigue rupture reinforcement means of the present invention, first the fracture tip on web or the edge of a wing arranges circular hole, fracture tip falls in the hole, then in the both sides, crack, the inclined plane is set, forms V-shaped groove, then with weld seam, V-shaped groove is filled and led up, angle steel is positioned over top flange that the crack occurs and the junction of web, be symmetrical arranged at web both sides angle steel, with high-strength bolt, web, top flange, angle steel linked into an integrated entity, high-strength bolt is welded after all should tightening again.
Described face of weld and web or mother metal surface, the edge of a wing are in same plane.
Described angle steel adopts unequal angle or equal leg angle.
Described high-strength bolt adopts 10.9 grades or 8.8 grades.
High-strength bolt hole employing on described angle steel is drilled to the hole.
The described hole that is drilled to comprises: the hole of friction-type or the hole of pressure-bearing type, the large 1.5～2.0mm of aperture ratio bolt diameter of friction-type, the large 1.0～1.5mm of aperture ratio bolt diameter of pressure-bearing type.
The present invention couples together angle steel and web and top flange by high-strength bolt, and angle steel is arranged in this method in web both sides the steel crane beam that produces tired broken ring is reinforced, and can suppress the expansion in crack.Can extend simply and effectively its working life.
The beneficial effect that technical solution of the present invention is brought
A, suppressed the expansion of fatigue crack on the crane girder simply and effectively.
B, reduced the probability of crane girder fatigue rupture, the crane girder of destroyed has been carried out effective reparation.
C, strengthen the security of operation of crane girder, improved the production efficiency of factory.
The welding crane girder that the present invention scraps factory with fatigue tester has carried out 2,000,000 fatigue tests, and result is as follows:
The contrast of table 1 1-6 fracture tip stress
Annotate: "-" expression tension in table
Description of drawings
Fig. 1 is front view of the present invention;
Fig. 2 is profile of the present invention;
Fig. 3 is web structure schematic diagram of the present invention;
Fig. 4 is that the present invention repairs the trailing web structural representation;
Fig. 5 is the 1-1 profile of Fig. 1.
The specific embodiment
The present invention adopts magnetic drill to beat circular hole at fracture tip accurately, utilizes pneumatic chipping chisel or cutting torch to form V-shaped groove 4 (web 2 thickness are during greater than 10mm, need be equipped with V-shaped groove 4 on the crane girder two sides) at circular hole with interior both sides, crack after punching.After fluting with the METAL HEATING PROCESS to 150 of mother metal～200
0C fills and leads up V-shaped groove 4 with corresponding weld seam 5 afterwards; Weld seam 5 surface and web 2 mother metal surfaces are in same plane.The present invention slows down the stress of fracture tip and concentrates, and the mother metal that has ftractureed is effectively connected, and prevents from forming new stress and concentrates weld grinding is smooth at last.Again angle steel 3 is positioned over top flange 1 that the crack occurs and the junction of web 2, be symmetrical arranged at web 2 both sides angle steel 3, with high-strength bolt 6, web 2, top flange 1, angle steel 3 are linked into an integrated entity, be welded again after described high-strength bolt 6 all should be tightened, thereby effectively extended service life of crane girder.
Angle steel 3 of the present invention adopts unequal angle or equal leg angle.
High-strength bolt 6 of the present invention adopts 10.9 grades or 8.8 grades.
High-strength bolt hole employing on angle steel 3 of the present invention is drilled to the hole.
The present invention is drilled to the hole and adopts the hole of friction-type or the hole of pressure-bearing type, the large 1.5～2.0mm of aperture ratio bolt diameter of friction-type, the large 1.0～1.5mm of aperture ratio bolt diameter of pressure-bearing type.
The welding crane girder that the present invention scraps factory with fatigue tester has carried out 2,000,000 fatigue tests, and result is as follows:
The 1# long 93mm in crack before experiment; The long 85mm in 2# crack; The 3# crack is divided into up and down two forks, the upside long 116mm in crack, the downside long 62mm in crack; The long 275mm in 4# crack; The long 450mm in 5# crack; The long 630mm in 6# crack.
In order to contrast the extension situation in crack, experiment is front in 1#, 4#, 5# crack end punching (diameter 5mm).Experiment adopts 500KN pulsation fatigue experimental machine to carry out, 200 beats/mins of ripple frequencies, fluctuating load 100kN-200kN, test number (TN) 2,000,000 times.
After test, crack is observed, and 1#, 4#, 5# crack is and sees development because end punches.2# fracture extension 65mm; 3# upside fracture extension 24mm, does not extend in the downside crack; 6# fracture extension 28mm.
This recovery scenario of experiment results proved can effectively extend the crane girder safe operating life.
Main purpose of the present invention is to strengthen the thickness of web upper area, has relatively reduced the bias of track and web, has reduced the principal tensile stress of crack tip.At first, investigate, the destruction situation of check crane girder and the length in crack, a part, select suitable angle steel, angle steel adopts unequal angle or equal leg angle, preferred unequal angle, the long limit of unequal angle is placed in the web side, the minor face of unequal angle is placed in the top flange side, and the high-strength bolt of preferred 10.9 grades packages bolt and tightens that it must not be had is loosening.
Claims (6)
1. steel crane beam fatigue rupture reinforcement means, it is characterized in that, first the fracture tip on web or the edge of a wing arranges circular hole, and fracture tip falls in the hole, then in the both sides, crack, the inclined plane is set, form V-shaped groove, with weld seam, V-shaped groove is filled and led up, angle steel is positioned over top flange that the crack occurs and the junction of web again, is symmetrical arranged at web both sides angle steel, with high-strength bolt, web, top flange, angle steel are linked into an integrated entity, high-strength bolt is welded after all should tightening again.
2. steel crane beam fatigue rupture reinforcement means according to claim 1, it is characterized in that: face of weld and web or mother metal surface, the edge of a wing are in same plane.
3. steel crane beam fatigue rupture reinforcement means according to claim 1, is characterized in that, described angle steel adopts unequal angle or equal leg angle.
4. steel crane beam fatigue rupture reinforcement means according to claim 1, is characterized in that, described high-strength bolt adopts 10.9 grades or 8.8 grades.
5. steel crane beam fatigue rupture reinforcement means according to claim 1, is characterized in that, the high-strength bolt hole employing on angle steel is drilled to the hole.
6. steel crane beam fatigue rupture reinforcement means according to claim 4, it is characterized in that, being drilled to the hole comprises: the hole of friction-type or the hole of pressure-bearing type, the large 1.5～2.0mm of aperture ratio bolt diameter of friction-type, the large 1.0～1.5mm of aperture ratio bolt diameter of pressure-bearing type.
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| CN201310039715.3A CN103111789B (en) | 2013-02-01 | 2013-02-01 | Steel crane beam fatigue rupture reinforcement means |
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| CN201310039715.3A CN103111789B (en) | 2013-02-01 | 2013-02-01 | Steel crane beam fatigue rupture reinforcement means |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060549A (en) * | 2014-06-30 | 2014-09-24 | 长安大学 | Bolted steel angle-based steel bridge out-of-plane distortion fatigue reinforcement structure |
| CN106894646A (en) * | 2017-02-27 | 2017-06-27 | 中冶建筑研究总院有限公司 | A kind of antifatigue bracing means of steel corbel post |
| CN109570911A (en) * | 2017-09-29 | 2019-04-05 | 中国二十冶集团有限公司 | Crane girder reinforcement means |
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| RU2235678C2 (en) * | 2002-07-08 | 2004-09-10 | Пензенская государственная архитектурно-строительная академия | Rail-beam structure with bull-heated rails |
| CN201186853Y (en) * | 2008-04-11 | 2009-01-28 | 西安建筑科技大学 | Inclined strut reinforced steel crane beam |
| CN201309797Y (en) * | 2008-11-20 | 2009-09-16 | 贵阳铝镁设计研究院 | Reinforced structure of steel crane girder |
| CN201901527U (en) * | 2010-12-13 | 2011-07-20 | 上海市机电设计研究院有限公司 | Extraweight-tonnage riveting type crane beam reinforcing device |
| CN202271550U (en) * | 2011-09-26 | 2012-06-13 | 沈艳艳 | Upper beam reinforcing mechanism for crane beam |
-
2013
- 2013-02-01 CN CN201310039715.3A patent/CN103111789B/en not_active Expired - Fee Related
Patent Citations (5)
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| RU2235678C2 (en) * | 2002-07-08 | 2004-09-10 | Пензенская государственная архитектурно-строительная академия | Rail-beam structure with bull-heated rails |
| CN201186853Y (en) * | 2008-04-11 | 2009-01-28 | 西安建筑科技大学 | Inclined strut reinforced steel crane beam |
| CN201309797Y (en) * | 2008-11-20 | 2009-09-16 | 贵阳铝镁设计研究院 | Reinforced structure of steel crane girder |
| CN201901527U (en) * | 2010-12-13 | 2011-07-20 | 上海市机电设计研究院有限公司 | Extraweight-tonnage riveting type crane beam reinforcing device |
| CN202271550U (en) * | 2011-09-26 | 2012-06-13 | 沈艳艳 | Upper beam reinforcing mechanism for crane beam |
Non-Patent Citations (2)
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| 冯玉珠: "《工业建筑钢结构事故分析、加固与改建》", 31 December 1986 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060549A (en) * | 2014-06-30 | 2014-09-24 | 长安大学 | Bolted steel angle-based steel bridge out-of-plane distortion fatigue reinforcement structure |
| CN106894646A (en) * | 2017-02-27 | 2017-06-27 | 中冶建筑研究总院有限公司 | A kind of antifatigue bracing means of steel corbel post |
| CN106894646B (en) * | 2017-02-27 | 2019-01-18 | 中冶建筑研究总院有限公司 | A kind of antifatigue bracing means of steel corbel column |
| CN109570911A (en) * | 2017-09-29 | 2019-04-05 | 中国二十冶集团有限公司 | Crane girder reinforcement means |
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Effective date of registration: 20140721 Address after: 014010 the Inner Mongolia Autonomous Region Baotou Kunqu Arden Street No. seven Applicant after: INNER MONGOLIA University OF SCIENCE AND TECHNOLOGY Applicant after: Baotou Lianchuang Special Engineering Co.,Ltd. Address before: 014010 the Inner Mongolia Autonomous Region Baotou Kunqu Arden Street No. seven Applicant before: INNER MONGOLIA University OF SCIENCE AND TECHNOLOGY |
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