CN103111789B - Steel crane beam fatigue rupture reinforcement means - Google Patents

Steel crane beam fatigue rupture reinforcement means Download PDF

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Publication number
CN103111789B
CN103111789B CN201310039715.3A CN201310039715A CN103111789B CN 103111789 B CN103111789 B CN 103111789B CN 201310039715 A CN201310039715 A CN 201310039715A CN 103111789 B CN103111789 B CN 103111789B
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crack
web
steel
crane
crane girder
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CN103111789A (en
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曹芙波
王晨霞
赵根田
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Baotou LIAN Special Engineering Co., Ltd.
Inner Mongolia University of Science and Technology
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Baotou Lian Special Engineering Co Ltd
Inner Mongolia University of Science and Technology
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Abstract

The present invention relates to a kind of steel crane beam fatigue rupture reinforcement means, belong to Structural Engineering field.The present invention includes crane girder, crane girder has crack, the circular hole that fracture tip is provided with, the both sides, crack of crane girder one end face or both ends of the surface are respectively equipped with inclined plane, two relative inclined plane formation V-shaped grooves, pile up weld seam in V-shaped groove, face of weld and crane girder mother metal surface are in same plane.The present invention is when there is local fatigue crack in steel crane beam, usually to develop rapidly and through, crane girder is caused to lose bearing capacity, at the circular hole that fracture tip is provided with, the both sides, crack of crane girder one end face or both ends of the surface are respectively equipped with inclined plane, two relative inclined plane formation V-shaped grooves, weld seam is piled up in V-shaped groove, face of weld and crane girder mother metal surface are in same plane, by high-strength bolt, angle steel and web and top flange are coupled together again, angle steel is arranged symmetrically in web both sides, this method is reinforced the steel crane beam producing fatigue rupture, the expansion in crack can be suppressed.The working life of steel crane beam can be extended simply and effectively.

Description

Steel crane beam fatigue rupture reinforcement means
Technical field:
The present invention relates to a kind of steel crane beam fatigue rupture reinforcement means, belong to 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.Its principal mode destroyed produces 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 production efficiency of factory and the development of national economy.The main cause of its tired broken ring is the additional bending stress that eccentric load produces.After crack appears in crane girder web, top flange and web just become two entities, and the ability of co-ordination between them declines, and make local occur excess stress and local buckling.The reinforcing mode of current steel crane beam has following scheme:
[1] Luo Bangfu, Wei Mingzhong, Shen Zuyan, Chen Minghui write: " Steel Structural Design handbook ", China Construction Industry Press, in October, 1989.
[2] kingdom's week: " steel construction-principle and design ", publishing house of Tsing-Hua University in November, 1993.
[3] " Design of Reinforcement of steel construction ", " steel construction qualification and reinforcing 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 volume the 2nd phase in 1997.
[5] " feature of crane girder Design of Reinforcement ", " steel construction qualification and reinforcing collected works (two) ", Ministry of Metallurgical Industry Building Research General Institute architecture information research department, June nineteen ninety-five.
[6] Lu swoons the foot of a hill or mountain: " analysis of Shoudu Iron and Steel Co soaking pit workshop steel crane beam utility efficiency ", " 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 volume the 6th phase in 1996.
[9] U.S.'s scheme:
The fatigue crack special hazard of crane girder is thought by the U.S., should eliminate in time, the fatigue crack of welding crane girder done to the test of three kinds of recovery scenarios:
(1) both sides, crack carbon arc air gouging is slotted, then complete penetration;
(2) the deep angle ribbed stiffener of 9.21 × 18.73cm is adopted;
(3) crack two top is bored straight 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 carbon arc air gouging fluting, then complete penetration again.For Web cracks, with arc air cutting fluting, and carry out repair welding, make weld metal clog fluting position, also slotting welding in the fracture back side, is polished same with web high, then the groove welding of ribbed stiffener complete penetration is welded in top flange following after repair welding.Check track centering situation, the web centering as far as possible of track and beam must be made.And gauge and crane wheelspan are adapted.For the note angle welding crack of the edge of a wing and web, also with air-arc cutting two sides fluting, reweld, complete penetration, the reparation of all weld seams all should be undertaken by " American Welding Society's specification ".
Repairing test proves, the anti-fatigue performance that crack air-arc cutting and manual welding, ribbed stiffener are welded in top flange following is best.
The shortcoming of program technology:
A, difficulty of construction are comparatively large, and cost is very high, and technology content requires high especially.
B, in crane running, be difficult to the centering as far as possible ensureing track and web.
C, when welding, easily to web primary fracture place produce 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 circular hole is set at the fracture tip on web or the edge of a wing, fracture tip falls in hole, then inclined plane is set in both sides, crack, forms V-shaped groove, then with weld seam, V-shaped groove is filled and led up, angle steel is positioned over and occurs the top flange in crack and the junction of web, in web both sides, angle steel is symmetrical arranged, and with high-strength bolt by integral to web, top flange, Bolted angle connection, 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 on described angle steel adopts drilled as holes.
Described drilled as holes comprises: the hole of friction-type or the hole of pressure-bearing type, the aperture 1.5 ~ 2.0mm larger than bolt diameter of friction-type, the aperture 1.0 ~ 1.5mm larger than bolt diameter of pressure-bearing type.
Angle steel and web and top flange are coupled together by high-strength bolt by the present invention, and angle steel is arranged in this method in web both sides and reinforces the steel crane beam producing tired broken ring, can suppress the expansion in crack.Its working life can be extended simply and effectively.
The beneficial effect that technical solution of the present invention is brought
A, inhibit the expansion of fatigue crack on crane girder simply and effectively.
B, decrease the probability of crane girder fatigue rupture, effective reparation has been carried out to the crane girder of destroyed.
C, strengthen the security of operation of crane girder, improve the production efficiency of factory.
The present invention's fatigue tester has carried out 2,000,000 fatigue tests to the welding crane girder that factory scraps, and result is as follows:
The contrast of table 11-6 fracture tip stress
Note: in table, "-" represents tension
Accompanying drawing explanation
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 trailing web structural representation;
Fig. 5 is the 1-1 profile of Fig. 1.
Detailed description of the invention
The present invention adopts magnetic drill to beat circular hole at fracture tip accurately, utilizes pneumatic chipping chisel or the cutting torch both sides, crack within circular hole to form V-shaped groove 4 (when web 2 thickness is greater than 10mm, need be equipped with V-shaped groove 4 on crane girder two sides) after punching.After fluting by the METAL HEATING PROCESS of mother metal to 150 ~ 200 0c, fills and leads up V-shaped groove 4 with corresponding weld seam 5 afterwards; Weld seam 5 surface is in same plane with web 2 mother metal surface.The stress that the present invention slows down fracture tip is concentrated, and is effectively connected by the mother metal ftractureed, and is finally concentrated by smooth for the weld grinding new stress of formation that prevents.Again angle steel 3 is positioned over and occurs the top flange 1 in crack 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, described high-strength bolt 6 is welded after all should tightening again, thus effectively extends the 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 on angle steel 3 of the present invention adopts drilled as holes.
Drilled as holes of the present invention adopts the hole of friction-type or the hole of pressure-bearing type, the aperture 1.5 ~ 2.0mm larger than bolt diameter of friction-type, the aperture 1.0 ~ 1.5mm larger than bolt diameter of pressure-bearing type.
The present invention's fatigue tester has carried out 2,000,000 fatigue tests to the welding crane girder that factory scraps, and result is as follows:
The long 93mm in 1# crack before experiment; The long 85mm in 2# crack; 3# crack is divided into upper and lower two forks, the long 116mm in crack, upside, the long 62mm in crack, downside; 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, at 1#, 4#, 5# crack end punching (diameter 5mm) before experiment.Experiment adopts 500KN pulsating fatigue experimental machine to carry out, ripple frequency 200 beats/min, fluctuating load 100kN-200kN, test number (TN) 2,000,000 times.
After test, crack is observed, and punching due to end in 1#, 4#, 5# crack, is and sees development.2# fracture extension 65mm; Fracture extension 24mm on the upside of 3#, crack, downside does not extend; 6# fracture extension 28mm.
This recovery scenario of experiment results proved can effectively extend crane girder safe operating life.
Main purpose of the present invention strengthens the thickness of web upper area, relatively reduces the bias of track and web, reduce the principal tensile stress of crack tip.First, investigate, the inspection destruction situation of 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 web side, the minor face of unequal angle is placed in side, top flange, preferably the high-strength bolt of 10.9 grades, is packaged by bolt to tighten that to make it have loosening.

Claims (1)

1. steel crane beam fatigue rupture reinforcement means, it is characterized in that, first arrange circular hole at the fracture tip on web or the edge of a wing, fracture tip falls in hole, then arranges inclined plane in both sides, crack, form V-shaped groove, filled and led up by V-shaped groove with weld seam, angle steel is positioned over and occurs the top flange in crack and the junction of web, and in web both sides, angle steel is symmetrical arranged again, with high-strength bolt by integral to web, top flange, Bolted angle connection, high-strength bolt is welded after all should tightening again;
Wherein, the High-strength bolt hole on angle steel adopts drilled as holes; Drilled as holes is the hole of friction-type, the aperture 1.5 ~ 2.0mm larger than bolt diameter of friction-type;
Wherein, the diameter of described circular hole is 5mm;
Wherein, described high-strength bolt adopts 10.9 grades of high-strength bolts;
Wherein, described angle steel adopts unequal angle, and the long limit of unequal angle is placed in web side, and the minor face of unequal angle is placed in side, top flange;
Wherein, face of weld and web or mother metal surface, the edge of a wing are in same plane.
CN201310039715.3A 2013-02-01 2013-02-01 Steel crane beam fatigue rupture reinforcement means Active CN103111789B (en)

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* Cited by examiner, † Cited by third party
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
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (1)

* Cited by examiner, † Cited by third party
Title
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