Welding-free reinforcing structure and method for fatigue cracks of steel bridge deck slab
By adopting a weld-free reinforcement structure on the top plate of the steel bridge deck, and using reinforced steel plates, steel mesh and ultra-high performance cement base material layer, the problem of fatigue cracking of steel bridge deck is solved, and rapid repair with the reinforcement effect comparable to welding or bolt bolting but without damage is achieved.
Patent Information
- Application Number
- CN202411678842.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-03-11
AI Technical Summary
The steel bridge deck has fatigue cracking problems under the action of high-frequency wheel loads. The existing reinforcement methods have defects that damage the original structure, are costly or are not suitable for large-scale cracks, making it difficult to achieve rapid and non-destructive repair.
Weld-free reinforcement structure is adopted, including steel bridge deck top plate, reinforced steel plate, reinforced steel mesh and ultra-high performance cement base material layer. By reinforcing the pre-holes and vertically bending steel plates of the steel plate, combined with the top plate weld nails and steel mesh, the fatigue cracks of the roof plate are reinforced.
The lateral bending stiffness and strength of the cracked area of the steel bridge deck top plate is enhanced, and the interface shear strength comparable to the welding or bolting reinforcement effect is achieved without causing damage to the original structure.
Smart Images
Figure CN119593319A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of bridge engineering, and in particular relates to a welding-free reinforcement structure and method for fatigue cracks of a steel bridge deck. Background Art
[0002] Orthotropic steel bridge decks have the advantages of light weight, high strength and good bearing capacity. They have been widely used in steel structure bridges since their birth. Due to the large difference in the mechanical properties of orthotropic steel bridge decks in the longitudinal and transverse directions of the bridge, the local stress amplitude of the bridge deck under vehicle load is relatively high. With the high-frequency wheel loads constantly passing on the steel bridge deck, a large number of fatigue cracking problems have occurred in the steel bridge deck. Many steel bridge decks with long-span steel box girders that are milestones at home and abroad have experienced fatigue cracking problems. After the steel bridge deck cracks, the local bending stiffness decreases, resulting in a high live load stress amplitude of the asphalt layer in the surface area of the steel box girder and fatigue damage, which in turn aggravates the fatigue damage of the steel bridge deck, while affecting the traffic safety of the bridge deck and increasing the expenditure of bridge maintenance costs.
[0003] At present, the fatigue crack reinforcement of steel bridge deck is often carried out by setting crack-stopping holes, welding or bolting steel plates, pasting carbon fiber cloth or SMA strips, etc. The above methods all have different limitations, such as: it is impossible to set crack-stopping holes in the top plate of the steel bridge deck, welding or bolting steel plates is a reinforcement method that damages the original structure, pasting carbon fiber cloth or SMA strips is expensive, etc., and they are not suitable for the reinforcement of the top plate-longitudinal rib detail cracks with the largest cracking scale of the steel bridge deck.
[0004] Therefore, it is necessary to combine the cracking characteristics of the steel bridge deck top plate-longitudinal rib details with the demand for non-destructive reinforcement, and propose a welding-free reinforcement method for fatigue cracks in steel bridge decks that causes little damage to the original structure and is easy to use mature construction technology, so as to achieve rapid and non-destructive repair of fatigue cracks in steel bridge decks. Summary of the invention
[0005] In view of this, the present invention provides a welding-free reinforcement structure and method for fatigue cracks of steel bridge decks, which are used to solve the above-mentioned problems.
[0006] In order to achieve the above object, the present invention adopts the following technical solution:
[0007] A welding-free reinforcement structure for fatigue cracks of a steel bridge deck, comprising: a steel bridge deck top plate, top plate rivets, a steel mesh, a steel bridge deck U-shaped stiffening rib, a reinforcing steel plate, and an ultra-high performance cement-based material layer; a plurality of the steel bridge deck U-shaped stiffening ribs are evenly fixed on the lower surface of the steel bridge deck top plate, the reinforcing steel plate is adhered to the top plate of the steel bridge deck within the range of fatigue cracks of the top plate, a plurality of holes are provided on the reinforcing steel plate, a vertical bent steel plate bent upward is provided on the holes, a plurality of top plate rivets are evenly welded on the upper surface of the steel bridge deck top plate, the steel mesh is installed on the top end of the top plate rivets and abuts against the top end of the vertical bent steel plate, and the ultra-high performance cement-based material layer is cast above the steel bridge deck top plate, the reinforcing steel plate and the steel mesh.
[0008] Furthermore, the holes are arranged as a plurality of small pre-dug holes of the reinforcing steel plate and a plurality of large pre-dug holes of the reinforcing steel plate, the small pre-dug holes of the reinforcing steel plate are provided with small pre-dug hole vertical bending plates, and the large pre-dug holes of the reinforcing steel plate are provided with large pre-dug hole vertical bending plates, and the top ends of the small pre-dug hole vertical bending plates and the large pre-dug hole vertical bending plates are both in contact with the bottom end of the steel mesh.
[0009] Furthermore, the small pre-dug holes in the reinforcing steel plate and the large pre-dug holes in the reinforcing steel plate are both rectangular, and the long sides are parallel to each other, the vertical bent plates of the small pre-dug holes are arranged on the two wide sides of the small pre-dug holes, and the vertical bent plates of the large pre-dug holes are arranged on the two long sides of the large pre-dug holes.
[0010] Furthermore, the periphery of the reinforcing steel plate is closed, and the edge of the reinforcing steel plate can abut against the top plate welding nails.
[0011] A welding-free reinforcement method for fatigue cracks in a steel bridge deck comprises the following steps:
[0012] S1. Cut the reinforcement steel plate according to the fatigue crack of the top plate, and open a plurality of small pre-dug holes and a plurality of large pre-dug holes on the reinforcement steel plate, and bend the steel plate in the small pre-dug holes of the reinforcement steel plate vertically upward with two wide sides as the reference to form a small pre-dug vertically bent plate; bend the steel plate in the large pre-dug holes of the reinforcement steel plate vertically upward with two long sides as the reference to form a large pre-dug vertically bent plate;
[0013] S2. Paste the reinforcement steel plate on the top plate of the steel bridge deck within the fatigue crack range of the top plate, and evenly weld a plurality of top plate welding nails on the top plate of the steel bridge deck;
[0014] S3. Place the steel mesh on the top of the small pre-dug vertical bent plate and the large pre-dug vertical bent plate, and install it on the top of the top plate weld nails;
[0015] S4. Pour a layer of ultra-high performance cement-based material over the top of the steel bridge deck, reinforcement steel plate and steel mesh to complete the reinforcement work.
[0016] Furthermore, in step S2, before the reinforcing steel plate is pasted to the fatigue crack of the top plate, the reinforced area on the upper surface of the top plate of the steel bridge deck and the lower surface of the reinforcing steel plate are shot blasted to remove rust.
[0017] Furthermore, in step S2, high-performance epoxy resin glue is applied to the upper surface of the steel bridge deck top plate, the reinforced steel plate is pasted on the steel bridge deck top plate, and is compacted with a heavy object to ensure the pasting effect.
[0018] The beneficial effects of the present invention are:
[0019] The present invention covers the reinforcing steel plate within the range of the top plate crack on the upper surface of the steel bridge deck, utilizes the reinforcing steel plate to enhance the lateral bending stiffness and strength of the cracked zone of the top plate of the steel bridge deck, and opens a small pre-dug hole and a large pre-dug hole for the reinforcing steel plate on the reinforcing steel plate. When the ultra-high performance cement-based composite material layer is subsequently poured, the top plate of the steel bridge deck in the reinforcement area and the reinforcing steel plate can directly contact the post-cast layer. At the same time, the small pre-dug hole vertical bent plate and the large pre-dug hole vertical bent plate can increase the interface shear strength between the reinforcing steel plate and the post-cast cement-based material layer, and limit the normal peeling of the interface between the reinforcing steel plate and the top plate of the steel bridge deck, which can achieve or even exceed the effect of bolting or welding the externally attached reinforcing steel plate, and at the same time will not cause new damage to the top plate of the steel bridge deck; the top plate rivets can increase the interface shear strength between the top plate of the steel bridge deck and the post-cast cement-based material layer.
[0020] The reinforcing steel plate used in the present invention has a simple structure and mature processing technology. It can be processed in the factory and then transported to the site, or the whole steel plate can be transported to the site and then cut according to actual reinforcement needs. The reinforcing steel plate does not require high-precision assembly with the steel bridge deck, and the processing accuracy requirements are not high. Compared with the currently commonly used methods, it has the advantages of being simple, efficient, and easy to implement, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0022] Figure 1 The plan layout of the welding-free reinforcement structure for fatigue cracks in steel bridge decks;
[0023] Figure 2 for Figure 1AA section layout drawing;
[0024] Figure 3 for Figure 1 BB section layout drawing;
[0025] Figure 4 for Figure 1 CC section layout drawing;
[0026] Figure 5 for Figure 1 DD section layout drawing;
[0027] Figure 6 The plan layout of the reinforcement steel plate;
[0028] Among them, in the figure:
[0029] 1- steel bridge deck top plate, 2- top plate weld nails, 3- top plate fatigue cracks, 4- steel mesh, 5- steel bridge deck U-shaped stiffening ribs, 6- reinforced steel plate, 7- small pre-dig holes in reinforced steel plates, 8- small pre-dig holes in vertically bent steel plates, 9- large pre-dig holes in reinforced steel plates, 10- large pre-dig holes in vertically bent steel plates, 11- ultra-high performance cement-based material layer. DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0031] Example 1
[0032] See attached Figure 1-6As shown, the present invention provides a welding-free reinforcement structure for fatigue cracks of a steel bridge deck, comprising: a steel bridge deck top plate 1, top plate welding nails 2, top plate fatigue cracks 3, a steel mesh 4, a steel bridge deck U-shaped stiffening rib 5, a reinforcement steel plate 6, a small pre-dug hole 7 for the reinforcement steel plate, a small pre-dug vertically bent steel plate 8, a large pre-dug hole 9 for the reinforcement steel plate, a large pre-dug vertically bent steel plate 10, and an ultra-high performance cement-based material layer 11; a plurality of steel bridge deck U-shaped stiffening ribs 5 are evenly fixed on the lower surface of the steel bridge deck top plate 1, and the reinforcement steel plate 6 is pasted within the range of the top plate fatigue crack 3 on the steel bridge deck top plate 1; the reinforcement steel plate 6 can be processed by using the most commonly used Q355 steel plate in bridge engineering, and the length of the reinforcement steel plate 6 can be processed according to the length of the specific crack; the method of using epoxy glue alone to paste the external steel plate is not reliable enough, and bolting or welding the external steel plate is used. The method of using a plate causes great damage to the original structure and is rarely used at present. In order to solve this problem, a plurality of holes are provided on the reinforcing steel plate 6, and a vertically bent steel plate bent upward is provided on the holes. When the ultra-high performance cement-based composite material layer is subsequently poured, the steel bridge deck top plate 1 and the reinforced steel plate 6 in the reinforcement area can directly contact the post-cast layer, and the vertically bent steel plate can increase the interface shear strength between the reinforced steel plate 6 and the post-cast cement-based material layer; a plurality of top plate rivets 2 are evenly welded on the upper surface of the steel bridge deck top plate 1, and the top plate rivets 2 can increase the interface shear strength between the steel bridge deck top plate 1 and the post-cast cement-based material layer; the steel mesh 4 is installed on the top of the top plate rivet 2 and abuts against the top of the vertically bent steel plate, and the ultra-high performance cement-based material layer 11 is poured on top of the steel bridge deck top plate 1, the reinforcing steel plate 6 and the steel mesh 4.
[0033] In a preferred embodiment, the holes are arranged as a plurality of small pre-dug holes 7 of the reinforcing steel plate and a plurality of large pre-dug holes 9 of the reinforcing steel plate. The small pre-dug holes 7 of the reinforcing steel plate are provided with small pre-dug vertical bending plates 8, so the large pre-dug holes 9 of the reinforcing steel plate are provided with large pre-dug vertical bending plates 10, and the top ends of the small pre-dug vertical bending plates 8 and the large pre-dug vertical bending plates 10 are both in contact with the bottom end of the steel mesh 4, such as Figure 6 As shown, the small pre-dug holes 7 and the large pre-dug holes 9 of the reinforced steel plates are both rectangular, and the long sides are parallel to each other. The large pre-dug holes 9 of the reinforced steel plates are arranged in the middle of multiple small pre-dug holes 7 of the reinforced steel plates. The small pre-dug hole vertical bending plates 8 are arranged on the two wide sides of the small pre-dug holes 7, that is, they are vertically bent upward along the cross-bridge direction. The large pre-dug hole vertical bending plates 10 are arranged on the two long sides of the large pre-dug holes 9, that is, they are vertically bent upward along the longitudinal direction. The small pre-dug hole vertical bending plates 8 are perpendicular to the bending directions of the large pre-dug hole vertical bending plates 10, which can further increase the interface shear strength between the reinforced steel plate 6 and the post-cast cement-based material layer 11 in both the transverse and longitudinal directions.
[0034] In a preferred embodiment, the periphery of the reinforcement steel plate 6 is closed to ensure that after the reinforcement steel plate 6 may slip, the top plate welding nails 2 can directly contact the edge of the reinforcement steel plate 6 to assist in shear resistance and ensure the safety of the structure.
[0035] Example 2
[0036] A welding-free reinforcement method for fatigue cracks in a steel bridge deck comprises the following steps:
[0037] S1. Cut the reinforcing steel plate 6 according to the fatigue crack 3 of the top plate, and open a plurality of small pre-dug holes 7 and a plurality of large pre-dug holes 9 on the reinforcing steel plate 6, and bend the steel plates in the holes of the small pre-dug holes 7 of the reinforcing steel plate vertically upwards based on the two wide sides to form a small pre-dug vertically bent plate 8; bend the steel plates in the holes of the large pre-dug holes 9 of the reinforcing steel plate vertically upwards based on the two long sides to form a large pre-dug vertically bent plate 10;
[0038] S2. Shot blasting and rust removal are performed on the reinforcement area on the upper surface of the steel bridge deck top plate 1 and the lower surface of the reinforcement steel plate 6, and high-performance epoxy resin glue is applied to the upper surface of the steel bridge deck top plate 1, and the reinforcement steel plate 6 is pasted on the steel bridge deck top plate 1, and a heavy object is used to compact it for a certain period of time to ensure the pasting effect; the reinforcement steel plate 6 is pasted within the range of the top plate fatigue crack 3 on the steel bridge deck top plate 1, and a plurality of top plate welding nails 2 are evenly welded on the steel bridge deck top plate 1;
[0039] S3. The steel mesh 4 is placed on the top of the small pre-dug vertical bending plate 8 and the large pre-dug vertical bending plate 10, and is installed on the top of the top plate rivet 2;
[0040] S4. Cast an ultra-high performance cement-based material layer 11 on top of the steel bridge deck top plate 1, the reinforcement steel plate 6 and the steel mesh 4 to complete the reinforcement work.
[0041] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.
[0042] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A welding-free reinforcement structure for fatigue cracks in steel bridge decks, characterized in that: include: A steel bridge deck top plate (1), top plate welding nails (2), a steel mesh (4), a steel bridge deck U-shaped stiffening rib (5), a reinforcement steel plate (6), and an ultra-high performance cement-based material layer (11); a plurality of the steel bridge deck U-shaped stiffening ribs (5) are evenly fixed on the lower surface of the steel bridge deck top plate (1); the reinforcement steel plate (6) is pasted within the range of the top plate fatigue crack (3) on the steel bridge deck top plate (1); a plurality of holes are provided on the reinforcement steel plate (6); a vertically bent steel plate bent upward is provided on the holes; a plurality of the top plate welding nails (2) are evenly welded on the upper surface of the steel bridge deck top plate (1); the steel mesh (4) is installed on the top of the top plate welding nails (2) and abuts against the top of the vertically bent steel plate; the ultra-high performance cement-based material layer (11) is cast above the steel bridge deck top plate (1), the reinforcement steel plate (6) and the steel mesh (4).
2. A welding-free reinforcement structure for fatigue cracks of steel bridge deck according to claim 1, characterized in that: The holes are arranged as a plurality of small pre-dug holes (7) of the reinforcing steel plate and a plurality of large pre-dug holes (9) of the reinforcing steel plate. The small pre-dug holes (7) of the reinforcing steel plate are provided with small pre-dug vertical bending plates (8), and the large pre-dug holes (9) of the reinforcing steel plate are provided with large pre-dug vertical bending plates (10). The top ends of the small pre-dug vertical bending plates (8) and the large pre-dug vertical bending plates (10) are both in contact with the bottom end of the steel mesh (4).
3. The welding-free reinforcement structure for fatigue cracks of steel bridge deck according to claim 2 is characterized in that: The small pre-dug hole (7) of the reinforcing steel plate and the large pre-dug hole (9) of the reinforcing steel plate are both rectangular, and the long sides are parallel to each other; the small pre-dug hole vertical bending plate (8) is arranged on the two wide sides of the small pre-dug hole (7), and the large pre-dug hole vertical bending plate (10) is arranged on the two long sides of the large pre-dug hole (9).
4. The welding-free reinforcement structure for fatigue cracks of steel bridge deck according to claim 1 is characterized in that: The reinforcing steel plate (6) is closed at its periphery, and the edge of the reinforcing steel plate (6) can abut against the top plate welding nails (2).
5. A welding-free reinforcement method for fatigue cracks in steel bridge decks, characterized in that: The steps include: S1. According to the fatigue cracks (3) of the top plate, the reinforcing steel plate (6) is cut, and a plurality of small pre-dug holes (7) and a plurality of large pre-dug holes (9) are opened on the reinforcing steel plate (6); the steel plates in the holes of the small pre-dug holes (7) of the reinforcing steel plate are vertically bent upwards based on the two wide sides to form a small pre-dug hole vertically bent plate (8); the steel plates in the holes of the large pre-dug holes (9) of the reinforcing steel plate are vertically bent upwards based on the two long sides to form a large pre-dug hole vertically bent plate (10); S2. Paste the reinforcing steel plate (6) on the top plate fatigue crack (3) of the steel bridge deck top plate (1), and evenly weld a plurality of top plate welding nails (2) on the steel bridge deck top plate (1); S3. The steel mesh (4) is placed on the top of the small pre-dug vertical bent plate (8) and the large pre-dug vertical bent plate (10), and installed on the top of the top plate rivet (2); S4. Casting an ultra-high performance cement-based material layer (11) above the steel bridge deck top plate (1), the reinforcement steel plate (6) and the steel mesh (4) to complete the reinforcement work.
6. A welding-free reinforcement method for fatigue cracks of steel bridge deck according to claim 5, characterized in that: In step S2, before the reinforcing steel plate (6) is pasted to the fatigue crack (3) of the top plate, the reinforced area on the upper surface of the steel bridge deck top plate (1) and the lower surface of the reinforcing steel plate (6) are shot blasted to remove rust.
7. The welding-free reinforcement method for fatigue cracks of steel bridge deck according to claim 5 is characterized in that: In step S2, high-performance epoxy resin glue is applied to the upper surface of the steel bridge deck top plate (1), and the reinforcement steel plate (6) is pasted on the steel bridge deck top plate (1), and is compacted with a heavy object to ensure the pasting effect.