Hammering closing repair method for fatigue crack of steel bridge

A fatigue crack and repair method technology, applied in bridge maintenance, bridge, bridge reinforcement, etc., can solve problems such as unsuitable for steel bridges, complex structures, etc., achieve the effect of changing the stress intensity factor, improving the stress situation, and increasing the fatigue strength

Active Publication Date: 2014-07-30
HOHAI UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, the parts where the fatigue cracks of the steel bridges are often the parts ...

Method used

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  • Hammering closing repair method for fatigue crack of steel bridge
  • Hammering closing repair method for fatigue crack of steel bridge
  • Hammering closing repair method for fatigue crack of steel bridge

Examples

Experimental program
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Embodiment 1

[0031] like figure 1 and figure 2 As shown in Fig. 1, the equipment for repairing steel bridge fatigue cracks by hammering closed cracks mainly includes pneumatic hammer 1, striker 2, and air compressor 3. The pneumatic hammer 1 is connected to the air compressor 3 through the air conduit 4 , and the striker 2 is inserted into the pneumatic hammer 1 to form a whole with the pneumatic hammer 1 . The air compressor 3 adopts a small portable air compressor to deliver the compressed air to the pneumatic hammer 1 to drive the striker 2 to perform hammering movement up and down, and to apply a hammering load to the surface of the steel plate 5 with fatigue cracks 7 . The specific working parameters of the air compressor 3 and the pneumatic hammer 1 vary according to the strength of the steel plate 5 to be processed.

[0032] As shown in Figure 3, the striker head 2a is in the shape of an inverted trapezoid with an area of ​​4mm×5mm, which can increase the hammering strength 13a u...

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Abstract

The invention discloses a hammering closing repair method for a fatigue crack of a steel bridge. A hammering load is exerted at a fatigue crack generating part of the steel bridge to enable the opening of the fatigue crack to be closed, so the purpose of repairing the fatigue crack is achieved. Therefore, the hammering closing repair method provided by the invention can overcome defects in a conventional repair technology adopted after the generating of the fatigue crack of the steel bridge in the prior art; the stress condition at the fatigue crack generating part can be effectively improved, the fatigue strength is enhanced, the fatigue crack of the steel bridge is prevented from being rapidly extended during a serving period, and the repairing effect is achieved.

Description

technical field [0001] The invention belongs to the field of bridge maintenance, and in particular relates to a steel bridge fatigue crack hammering closure repair technology. Background technique [0002] With the rapid development of the economy, in order to meet the needs of the rapid growth of traffic, my country has built a number of long-span bridges. Long-span bridges require smaller structural weight and higher structural strength, while steel bridges have the advantages of light weight, high strength, and convenient fabrication and construction, and have been widely used in bridge construction. [0003] The overall service life of steel bridges in my country is not long, but some bridges have been in service for more than ten years. Due to the incomplete design theory of bridges and the lack of structural measures, coupled with the increasing traffic year by year, under the repeated action of vehicle loads, fatigue cracks are prone to occur in the steel parts with ...

Claims

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Application Information

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IPC IPC(8): E01D22/00
Inventor 吉伯海袁周致远傅中秋李坤坤杨沐野
Owner HOHAI UNIV
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