Steel box girder fatigue crack reinforcing mechanism capable of increasing friction force

Abstract

The utility model discloses a steel box girder fatigue crack reinforcing mechanism capable of increasing friction force, which is used for reinforcing a reinforced web plate of a steel box girder and comprises an inner steel bar, an outer steel bar, a unilateral bolt and rubber washers, the reinforced web plate is provided with at least two fixing holes, and the rubber washers are respectively embedded in the fixing holes; the inner and outer steel bars comprise steel bar bodies and inner and outer screw holes corresponding to fixing holes in a reinforced web, and protruding neck bush rings integrally formed with the steel bar bodies are arranged on the outer edges of the inner sides of the outer screw holes. The inner steel bars and the outer steel bars are arranged on the inner side and the outer side of the web to be reinforced respectively and penetrate through the outer screw holes, the rubber gaskets and the inner screw holes in sequence through unilateral bolts, and therefore the inner steel bars, the outer steel bars and the web to be reinforced are fastened. According to the utility model, single-side fastening operation can be realized, the use is simple, and the anti-loosening and anti-disturbance effects of a reinforcing part and a structure can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering, in particular to a steel bar reinforcement structure for repairing fatigue cracks at a weld between a steel box girder top plate and a U-rib. Background Art

[0002] Orthotropic steel bridge decks are widely used in my country's bridge systems due to their lightweight structure, high strength, and adaptability to complex terrain. However, during daily operation, steel bridge decks are prone to fatigue cracking under cyclic vehicle loads. Repairing fatigue cracks and ensuring the safe operation of steel bridges is a key issue in steel bridge research.

[0003] Currently, steel bar reinforcement is a relatively simple and practical method for repairing fatigue cracks in steel bridges. This involves sequentially covering the cracked area with several steel bars of the same material along the crack, then connecting each group of bars to the structure with high-strength bolts for local structural reinforcement. However, due to the complex internal environment and numerous disturbances within steel box girders, conventional steel bar reinforcement can sometimes cause relative displacement between the reinforced components and the crack due to external disturbances, weakening the reinforcement effect and causing the fatigue crack to continue to slowly develop. Summary of the Invention

[0004] Purpose of the invention: In response to the defects and technical problems existing in the background technology, the utility model provides a steel box girder fatigue crack reinforcement mechanism with increased friction, which can realize unilateral tightening operation, is simple to use, and can improve the anti-loosening and anti-disturbance effects of the reinforced components and structures.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a steel box girder fatigue crack reinforcement mechanism that increases friction, used to reinforce the reinforced web of the steel box girder, comprising: inner steel bars, outer steel bars, single-sided bolts and rubber washers, wherein:

[0006] The reinforced web is provided with at least two fixing holes, and the rubber washers are respectively embedded in the fixing holes;

[0007] The outer steel bar includes a steel bar body and external screw holes corresponding to the fixing holes on the reinforced web, and the inner outer edge of the external screw holes is provided with a raised inner lining ring integrally formed with the steel bar body;

[0008] The inner steel bar includes a steel bar body and inner screw holes corresponding to the fixing holes on the reinforced web, and the outer edges of the outer screw holes are provided with raised inner lining rings integrally formed with the steel bar body;

[0009] The inner and outer steel bars are respectively arranged on the inner and outer sides of the reinforced web, and are fastened to the reinforced web by single-sided bolts passing through the outer screw holes, rubber washers and inner screw holes in sequence.

[0010] Preferably, the contact surfaces between the inner and outer steel bars and the reinforced web are respectively provided with roughening mechanisms.

[0011] Preferably, the cross section of the rubber gasket is I-shaped. When the inner and outer steel bars are tightened to reinforce the reinforced web, the inner lining rings of the inner and outer steel bars are respectively embedded in the rubber gasket.

[0012] Preferably, the inner and outer steel bars are rectangular, the centers of the inner and outer screw holes are located on the center line of the short side of the steel bar body, and are symmetrically distributed along the center line of the long side of the steel bar body.

[0013] Preferably, the thickness of the inner lining ring protrusion is less than half the thickness of the reinforced web; the outer diameter of the inner lining ring matches the inner diameter of the corresponding rubber gasket, and is larger than the width of the rectangle and the thickness of the steel bar body; the inner diameter of the inner lining ring matches the aperture of the inner and outer screw holes.

[0014] Preferably, the rubber gasket is made of fluororubber, and the outer diameter of the rubber gasket matches the diameter of the fixing hole of the reinforced web.

[0015] Preferably, the roughening mechanism includes annular roughening stripes and a roughening stripe group. The annular roughening stripes are made of fluororubber and are installed on the outer edges of the plate surfaces adjacent to the inner and outer steel bars and the reinforced web surfaces, and are adhered to the steel bar body through silicate glue.

[0016] Preferably, the roughened stripe group adopts a whole rubber patch, the patch surface comprises a plurality of parallel stripe lines arranged obliquely, the stripe groups are divided into upwardly inclined and / or downwardly inclined, and the upwardly inclined and / or downwardly inclined angles are 15-45 degrees.

[0017] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0018] 1. By setting the roughened stripes on the plate surface adjacent to the inner and outer steel bars and the reinforced web surface, the friction generated by the fastening connection between the inner and outer steel bars is increased, the local reinforcement effect of the steel bars is enhanced, and the expansion of fatigue cracks is better prevented and delayed.

[0019] 2. By setting up the inclined roughening stripe group, the tensile deformation of the roughening stripes when subjected to friction forces in different directions is reduced, thereby improving the stability of the structure.

[0020] 3. The inner lining ring is integrally formed with the steel bar, increasing the friction of the structure. The inner lining ring is embedded in the rubber gasket during installation. When the structure encounters external disturbances, the rubber gasket provides a buffer, enhancing the stability of the structure and improving the anti-loosening performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the steel box girder fatigue crack reinforcement mechanism for increasing friction according to the present invention.

[0022] Figure 2 This is a schematic structural diagram of the outer steel bar of the present invention.

[0023] Figure 3 It is a structural schematic diagram of the rubber gasket described in the utility model.

[0024] Figure 4 This is a schematic diagram of the installation structure of the steel box girder fatigue crack reinforcement mechanism for increasing friction according to the present invention.

[0025] Figure 5 This is a schematic diagram of the roughening stripe group and stripe distribution described in the present invention.

[0026] Among them, the outer steel bar 1, the inner steel bar 2, the reinforced web 3, the inner lining ring 4, the first inner lining ring 401, the second inner lining ring 402, the rubber washer 5, the first rubber washer 501, the second rubber washer 502, the single-sided bolt 6, the annular roughened stripe 7, and the roughened stripe group 8. DETAILED DESCRIPTION

[0027] The present invention is further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0028] like Figure 1-5 As shown, the fatigue crack reinforcement mechanism for steel box beams for increasing friction in the present invention mainly includes an outer steel bar 1, an inner steel bar 2, a reinforced web 3, a first inner lining ring 401, a second inner lining ring 402, a first rubber washer 501, a second rubber washer 502, a single-sided bolt 6, an annular roughening stripe 7 and a roughening stripe group 8.

[0029] The inner and outer steel bars are each provided with inner and outer screw holes, corresponding to the fixing holes in the reinforced web. The outer steel bar comprises a main steel bar body and outer screw holes corresponding to the fixing holes in the reinforced web. The inner outer edges of these outer screw holes are fitted with raised inner lining rings integrally formed with the main steel bar body. During installation, the inner lining rings and rubber washers are threadedly engaged with the single-sided bolts (6) and tightened securely.

[0030] The inner steel bar 2 passes through the web fixing hole, and the width and thickness of the inner steel bar 2 are both smaller than the diameter of the web fixing hole B. The single-sided bolt passes through the outer screw hole, the fixing hole, and the inner screw hole in sequence and is tightened to fasten the steel bar to the reinforced web.

[0031] The cross-section of the rubber gasket is an I-shaped shape, which facilitates the corresponding insertion of the inner sleeve rings on the inner and outer steel bars. The outer diameter of the rubber gasket should match the fixing hole of the web plate, and the inner diameter of the inner sleeve ring should match the inner diameter of the inner and outer screw holes in the inner and outer steel plates, and match the diameter of the single-side bolt.

[0032] like Figure 4 As shown, the annular roughening stripes 7 are made of fluororubber and bonded to the steel bar surface via silicate adhesive. The stripes are arc-shaped, with a height of approximately 1 mm and a width of approximately 5 mm. Roughening stripe groups 8 are located on both sides of the outer screw holes and in the middle of the steel bar, oriented in both upward and downward directions. The number of stripes is determined based on the actual steel bar dimensions required for the project.

[0033] The construction method of the steel bar reinforcement structure of the present invention comprises the following steps:

[0034] (a) According to the actual crack trajectory and length, the number and size of steel bars are determined and reinforcing steel bars are prefabricated.

[0035] (b) A single-sided bolt is passed through the inner screw hole of the inner steel bar. Using the single-sided bolt as a support handle, the inner steel bar is passed through the web fixing hole and placed inside the U-rib structure.

[0036] (c) Use a strong magnet to attract and adjust the position of the inner steel bar so that the inner steel bar fits in with the reinforced web and the other opening is aligned with the other opening of the reinforced web.

[0037] (d) The single-sided bolt 6 passes through the inner screw hole of the inner steel bar, and the single-sided bolts on both sides are pulled so that the inner screw hole of the inner steel bar is aligned with the fixing hole of the reinforced web, and the inner lining rings 402 and 404 pass through the single-sided bolt and are embedded in the fixing holes.

[0038] (e) Insert the rubber washers 501 and 502 into the fixing holes of the single-sided bolts and fit them into the lining rings 402 and 404.

[0039] (e) The outer screw hole of the outer steel bar passes through the single-sided bolt, so that the outer steel bar fits the reinforced web, the outer screw hole is aligned with the fixing hole, and the inner lining rings 401, 403 are embedded with the rubber washers 501, 502.

[0040] (f) Tighten the single-side bolts to complete the structural installation.

[0041] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A steel box girder fatigue crack reinforcement mechanism for increasing friction, used for reinforcing the reinforced web of a steel box girder, characterized in that: include: Inner steel bars, outer steel bars, single-sided bolts and rubber washers, including: The reinforced web is provided with at least two fixing holes, and the rubber washers are respectively embedded in the fixing holes; The outer steel bar includes a steel bar body and external screw holes corresponding to the fixing holes on the reinforced web, and the inner outer edge of the external screw holes is provided with a raised inner lining ring integrally formed with the steel bar body; The inner steel bar includes a steel bar body and inner screw holes corresponding to the fixing holes on the reinforced web, and the outer edges of the outer screw holes are provided with raised inner lining rings integrally formed with the steel bar body; The inner and outer steel bars are respectively arranged on the inner and outer sides of the reinforced web, and are fastened to the reinforced web by single-sided bolts passing through the outer screw holes, rubber washers and inner screw holes in sequence.

2. The steel box girder fatigue crack reinforcement mechanism for increasing friction according to claim 1, characterized in that: The contact surfaces of the inner and outer steel bars with the reinforced web are respectively provided with roughening mechanisms.

3. The steel box girder fatigue crack reinforcement mechanism for increasing friction according to claim 1, characterized in that: The cross section of the rubber gasket is an I-shape. When the inner and outer steel bars are tightened to reinforce the reinforced web, the inner lining rings of the inner and outer steel bars are respectively embedded in the rubber gasket.

4. The steel box girder fatigue crack reinforcement mechanism for increasing friction according to claim 1, characterized in that: The inner and outer steel bars are rectangular, and the centers of the inner and outer screw holes are located on the center line of the short side of the steel bar body and are symmetrically distributed along the center line of the long side of the steel bar body.

5. The steel box girder fatigue crack reinforcement mechanism for increasing friction according to claim 4, characterized in that: The thickness of the inner lining collar protrusion is less than half the thickness of the reinforced web; the outer diameter of the inner lining collar matches the inner diameter of the corresponding rubber gasket and is larger than the width of the rectangle and the thickness of the steel bar body; the inner diameter of the inner lining collar matches the aperture of the inner and outer screw holes.

6. The steel box girder fatigue crack reinforcement mechanism for increasing friction according to claim 1, characterized in that: The rubber gasket is made of fluororubber, and the outer diameter of the rubber gasket matches the hole diameter of the fixed hole of the reinforced web.

7. The steel box girder fatigue crack reinforcement mechanism for increasing friction according to claim 2, characterized in that: The roughening mechanism includes annular roughening stripes and a roughening stripe group. The annular roughening stripes are made of fluororubber and are installed on the outer edges of the inner and outer steel bars adjacent to the reinforced web surface and are adhered to the steel bar body through silicate glue.

8. The steel box girder fatigue crack reinforcement mechanism for increasing friction according to claim 7, characterized in that: The roughened stripe group adopts a whole rubber patch, and the patch surface comprises a plurality of parallel stripe lines arranged obliquely. The stripe group is divided into upward oblique and / or downward oblique, and the upward oblique and / or downward oblique angles are 15-45 degrees.

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