Preventive maintenance method for fatigue crack of steel box girder and steel box girder

A technology of preventive maintenance and fatigue cracks, applied in bridges, bridge maintenance, bridge reinforcement, etc., can solve the problems of poor repair methods for cracks in steel box girders, achieve good maintenance effects, save materials, and improve fatigue resistance Effect

Active Publication Date: 2018-12-18
ZHEJIANG JIAOGONG HIGHWAY MANTAINANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to provide a preventive maintenance method for steel box girder fatigue cracks, to solve the technical problem of poor effect of existing steel box girder crack repair methods

Method used

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  • Preventive maintenance method for fatigue crack of steel box girder and steel box girder
  • Preventive maintenance method for fatigue crack of steel box girder and steel box girder
  • Preventive maintenance method for fatigue crack of steel box girder and steel box girder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] When performing preventive maintenance on the weld between the embedding section 110 and the U-shaped rib 300, the following steps are included:

[0048] S10: grinding the surface of the first welding seam 710 to be even;

[0049]S20: Grinding along the cracking direction of the coating on the first welding seam 710, so as to eliminate the microcracks on the first welding seam 710.

[0050] Specifically, such as Figure 2 to Figure 4 As shown, when curing the first weld 710 between the interlocking section 110 and the U-shaped rib 300, first reciprocate grinding along the direction indicated by the ab arrow, so that image 3 The uneven parts on the first welding seam 710 shown in Figure 4 The state of the first weld 710 in the middle. At this time, the surface of the first welding seam 710 is smooth and smooth.

[0051] After S10 and S20, the obvious defects on the surface of the first weld 710 are removed, so that the stress at the position of the first weld 710 i...

Embodiment 2

[0065] When maintaining the position of the arc-shaped gap 210 at the intersection of the diaphragm 200 and the lower flange of the U-shaped rib 300, it includes performing preventive maintenance on the end of the connecting weld between the U-shaped rib 300 and the diaphragm 200, and Carry out preventive maintenance on the parts of the arc gap.

[0066] Wherein, when performing preventive maintenance on the end of the connecting weld between the U-shaped rib 300 and the diaphragm 200, that is, the second weld 720, the following steps are included:

[0067] S10': grinding the surface of the second weld 720 to be flush;

[0068] S20': Grinding along the cracking direction of the coating on the second welding seam 720, so as to eliminate the microcracks on the second welding seam 720.

[0069] This step S10' and step S20' are similar to the basic operation process and function of the above step S10 and step S20, so the text will not be repeated.

[0070] When maintaining the s...

Embodiment 3

[0084] When performing preventive maintenance on the longitudinal fillet weld between the top plate 100 and the U-shaped rib 300, that is, the third weld 730, the following steps are included:

[0085] S10": grinding the surface of the third weld 730 to be flush;

[0086] S20": Grinding along the cracking direction of the coating on the third welding seam 730, so as to eliminate the microcracks on the third welding seam 730.

[0087] The basic operation process and function of the step S10 ″ and step S20 ″ are similar to those of the above step S10 and step S20 , so the description will not be repeated here.

[0088] When performing preventive maintenance on the third weld 730 between the top plate 100 and the U-shaped rib 300, the following steps are also included:

[0089] S30": grinding the third weld seam 730 again, and the grinding direction is at an angle to the cracking direction of the coating.

[0090] Preferably, the grinding direction in step S30" is perpendicular...

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Abstract

The invention provides a preventive maintenance method for fatigue cracks of steel box girders and a steel box girder, which relates to the technical field of maintenance of steel box girders and is designed to solve the problem of poor effect of existing repair methods for cracks of steel box girders. The preventive maintenance method for fatigue cracks of the steel box girder is used for curingthe welding seam of the steel box girder, comprising the following steps of: polishing the surface of the welding seam to be flush; Grinding is carried out in the direction of coating cracking on theweld to eliminate microcracks on the weld. The steel box girder is cured by the precautionary maintenance method of the fatigue crack of the steel box girder. The invention provides a preventive maintenance method for fatigue cracks of a steel box girder and the purpose that the steel box girder is used for realizing accumulative damage to a metal surface and elimination of small cracks before thecrack extends over a large area, thereby greatly improving the fatigue resistance at the welding seam of the existing steel box girder.

Description

technical field [0001] The invention relates to the technical field of steel box girder maintenance, in particular to a preventive maintenance method for steel box girder fatigue cracks and the steel box girder. Background technique [0002] Orthotropic deck steel box girders are widely used in the construction of large and medium-sized bridges. The structure of the steel box girder includes a bottom plate, diaphragms arranged at intervals, a roof above the diaphragm, and U-shaped ribs arranged along the length of the roof. , wherein, the transverse diaphragm is fixedly arranged on the bottom plate, and a notch is opened on the transverse diaphragm, and the U-shaped rib is fixedly arranged in the notch. The two sides of the notch are provided with arc-shaped notches, and gaps are left between the edges of the arc-shaped notches and the U-shaped ribs. The two sides of the U-shaped rib are welded to the upper half of the two sides of the notch, and are spaced from the lower h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D22/00E01D2/04
CPCE01D2/04E01D22/00
Inventor 张晓锋郑舟军陆安君白洪海仝德磊徐明刘尊良周网吴林周慧娟张晟
Owner ZHEJIANG JIAOGONG HIGHWAY MANTAINANCE
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