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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Abstract
The utility model relates to a repair mechanism for fatigue cracks in steel crane girders, which belongs to the field of structural engineering and comprises a crane girder, wherein cracks are opened on the crane girder and equipped with round holes at ends, an inclined face is respectively disposed on both sides of the cracks on one end face or two end faces of the crane girder, the opposite inclined faces from a V-shaped groove in which welding joints are accumulated and the surface of the welding joints is flush with the surface of base metal of the crane girder. When the fatigue cracks appear in some parts of the steel crane girder, the repair mechanism for the fatigue cracks in the steel crane girders can be rapidly developed and communicated generally, thus the crane girder will loss bearing capacity thereof. The round holes are disposed on the crack ends; the inclined face is respectively disposed on both sides of the cracks on the one end face or the two end faces of the crane girder; the two opposite inclined faces form the V-shaped groove in which the welding joints are accumulated; and the surface of the welding joints is flush with the surface of the base metal of the crane girder. Angle steel is connected to a web and a top flange by high-strength bolts and disposed symmetrically on both sides of the web. In this way, the steel crane girder with the existing fatigue cracks is reinforced, so expansion of the cracks can be restrained and service life of the steel crane girder can be extended simply and effectively.
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)
1. steel crane beam fatigue crack repairing mechanism, comprise web, the edge of a wing, it is characterized in that: the fracture tip on web or the edge of a wing arranges circular hole, 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.
2. steel crane beam fatigue crack repairing mechanism according to claim 1, 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 crack repairing mechanism according to claim 1, is characterized in that, described angle steel adopts unequal angle or equal leg angle.
4. steel crane beam fatigue crack repairing mechanism 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 crack repairing mechanism according to claim 1, is characterized in that, the high-strength bolt hole on angle steel adopts and is drilled to hole.
6. steel crane beam fatigue crack repairing mechanism according to claim 5, it is characterized in that, being drilled to 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.
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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203418279U true CN203418279U (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
Granted publication date: 20140205 Termination date: 20160201 |
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| CF01 | Termination of patent right due to non-payment of annual fee |