CN203418279U - Repair mechanism for fatigue cracks in steel crane girders - Google Patents
Repair mechanism for fatigue cracks in steel crane girders Download PDFInfo
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- CN203418279U CN203418279U CN201320056815.2U CN201320056815U CN203418279U CN 203418279 U CN203418279 U CN 203418279U CN 201320056815 U CN201320056815 U CN 201320056815U CN 203418279 U CN203418279 U CN 203418279U
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- steel
- crane beam
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- web
- shaped groove
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 230000008263 repair mechanism Effects 0.000 title abstract 2
- 239000000463 material Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 230000006378 damage Effects 0.000 abstract description 3
- 239000010953 base metal Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000002173 dizziness Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
本实用新型涉及一种钢吊车梁疲劳裂缝修复机构，属于结构工程领域。本实用新型包括：吊车梁，吊车梁上开有裂缝，裂缝端部设有的圆孔，吊车梁一端面或两端面的裂缝两侧分别设有倾斜面，两相对的倾斜面形成V形槽, V形槽内堆积焊缝，焊缝表面与吊车梁母材表面处于同一平面。本实用新型在钢吊车梁出现局部疲劳裂缝时，通常会迅速发展并且贯通，导致吊车梁丧失承载能力, 在裂缝端部设有的圆孔，吊车梁一端面或两端面的裂缝两侧分别设有倾斜面，两相对的倾斜面形成V形槽, V形槽内堆积焊缝，焊缝表面与吊车梁母材表面处于同一平面，再通过高强螺栓将角钢与腹板及上翼缘连接起来,角钢对称布置在腹板两侧，这种方法对产生疲劳破坏的钢吊车梁进行加固，能抑制裂缝的扩展。可以简单有效地延长钢吊车梁的工作寿命。
The utility model relates to a fatigue crack repair mechanism for a steel crane beam, which belongs to the field of structural engineering. The utility model comprises: a crane beam, a crack is opened on the crane beam, a round hole is provided at the end of the crack, inclined surfaces are respectively arranged on both sides of the crack on one or both ends of the crane beam, and the two opposite inclined surfaces form a V-shaped groove. , The weld seam is accumulated in the V-shaped groove, and the surface of the weld seam is on the same plane as the surface of the parent metal of the crane beam. In the utility model, when local fatigue cracks appear in the steel crane beam, they usually develop rapidly and penetrate, causing the crane beam to lose its bearing capacity. There are inclined surfaces, two opposite inclined surfaces form a V-shaped groove, and welds are accumulated in the V-shaped groove. The surface of the weld seam is on the same plane as the surface of the base metal of the crane beam, and then the angle steel is connected with the web and the upper flange by high-strength bolts , The angle steel is symmetrically arranged on both sides of the web. This method can strengthen the steel crane beam that has fatigue damage and can inhibit the expansion of cracks. It can simply and effectively prolong the working life of the steel crane girder.
Description
Technical field:
The utility model relates to the repairing mechanism in a kind of steel crane beam crack, belongs 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.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.When Hou， top flange, crack and web appear in crane girder web, just become two entities, between them, the ability of co-ordination declines, and makes part occur excess stress and local buckling.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 is identified and is reinforced collected works (two) > >, Ministry of Metallurgical Industry Building Research General Institute architecture information research department, June nineteen ninety-five.
[4] Song Liansheng: man-rate and the reinforcing of “Mou factory crane girder ", < < industrial building > > the 27th the 2nd phase of volume in 1997.
[5] " feature of crane girder Design of Reinforcement ", < < steel construction is identified and is reinforced 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: " Shoudu Iron and Steel Co soaking pit workshop steel crane beam is used investigation and analysis ", the < < steel construction > > second phase in 1992.
[7] " Welded Steel Crane upper area fatigue rupture special topic ", the < < 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.
Summary of the invention
The purpose of this utility model is to provide a kind of simple in structure, steel crane beam fatigue crack repairing mechanism safely and effectively.
Technical solution:
The utility model comprises web, the edge of a wing, and the fracture tip on web or the edge of a wing arranges circular hole, and fracture tip falls in hole, in both sides, crack, inclined plane is set, form V-shaped groove, weld seam is filled and led up V-shaped groove, and 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, web, top flange, angle steel is linked into an integrated entity.
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 and is drilled to 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.
Beneficial effect
A, effectively suppressed the expansion of fatigue crack on crane girder.
B, reduced the probability of crane girder fatigue rupture, the crane girder of destroyed has been carried out to effective reparation.
C, strengthen the security of operation of crane girder, improved the safety production efficiency of factory.
Accompanying drawing explanation
Fig. 1 is the utility model front view;
Fig. 2 is the utility model profile;
Fig. 3 is the utility model web structure schematic diagram;
Fig. 4 is that the utility model is repaired trailing web structural representation;
Fig. 5 is the 1-1 profile of Fig. 1.
The specific embodiment
The utility model adopts magnetic drill at fracture tip, to beat circular hole accurately, utilizes pneumatic chipping chisel or cutting torch with interior both sides, crack, to form V-shaped groove 4 (when web 2 thickness are greater than 10mm, need be equipped with on crane girder two sides V-shaped groove 4) at circular hole after punching.After fluting by 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 surfaces and web 2 mother metal surfaces are in same plane.The utility model slows down the stress of fracture tip to be concentrated, and the mother metal having ftractureed is effectively connected, and finally prevents from forming new stress and concentrates weld grinding is smooth.Again angle steel 3 is positioned over and occurs the top flange 1 in crack and the junction of web 2, at web 2 both sides angle steel 3, be symmetrical arranged, 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, thereby has effectively extended the service life of crane girder.
The utility model angle steel 3 adopts unequal angle or equal leg angle.
The utility model high-strength bolt 6 adopts 10.9 grades or 8.8 grades.
High-strength bolt hole on the utility model angle steel 3 adopts and is drilled to hole.
The utility model is drilled to 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 utility model is scrapped 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; 3# crack is divided into upper and lower two forks, the long 116mm in upside crack, the long 62mm in downside 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/min of ripple frequencies, fluctuating load 100kN-200kN, test number (TN) 2,000,000 times.
After test, crack is observed, and 1#, 4#, 5# crack, because end punches, are and see development.2# fracture extension 65mm; 3# upside fracture extension 24mm, does not extend in downside crack; 6# fracture extension 28mm.
This recovery scenario of experiment results proved can effectively extend crane girder safe operating life.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320056815.2U CN203418279U (en) | 2013-02-01 | 2013-02-01 | Repair mechanism for fatigue cracks in steel crane girders |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320056815.2U CN203418279U (en) | 2013-02-01 | 2013-02-01 | Repair mechanism for fatigue cracks in steel crane girders |
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| Publication Number | Publication Date |
|---|---|
| CN203418279U true CN203418279U (en) | 2014-02-05 |
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| CN201320056815.2U Expired - Fee Related CN203418279U (en) | 2013-02-01 | 2013-02-01 | Repair mechanism for fatigue cracks in steel crane girders |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060551A (en) * | 2014-06-30 | 2014-09-24 | 长安大学 | Bonded steel angle-based steel bridge out-of-plane distortion fatigue reinforcement structure and method |
| 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 |
| CN104060550A (en) * | 2014-06-30 | 2014-09-24 | 长安大学 | Cold reinforcement structure for external deformation fatigue of steel bridge deck |
-
2013
- 2013-02-01 CN CN201320056815.2U patent/CN203418279U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060551A (en) * | 2014-06-30 | 2014-09-24 | 长安大学 | Bonded steel angle-based steel bridge out-of-plane distortion fatigue reinforcement structure and method |
| 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 |
| CN104060550A (en) * | 2014-06-30 | 2014-09-24 | 长安大学 | Cold reinforcement structure for external deformation fatigue of steel bridge deck |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140205 Termination date: 20160201 |