Reinforcing structure and method for fatigue cracks of steel bridge deck slab cover plate

Abstract

The invention discloses a reinforcing structure and method for fatigue cracks of a steel bridge deck cover plate, and belongs to the field of bridge engineering. The reinforcing structure comprises a steel bridge deck top plate, a steel bridge deck U-shaped stiffening rib, a reinforcing mesh, a reinforcing steel plate, a top plate welding stud and an ultra-high performance cement-based material layer; the steel bridge deck U-shaped stiffening ribs are evenly fixed to the lower surface of the steel bridge deck top plate, the reinforcing steel plate is pasted within the fatigue crack range of the top plate, the top plate welding studs are evenly welded to the upper surface of the steel bridge deck top plate, and the reinforcing mesh is installed at the top ends of the top plate welding studs. And the ultra-high performance cement-based material layer is poured above the steel bridge deck top plate, the reinforcing steel plate and the reinforcing mesh. The top plate cracks on the steel bridge deck are covered with the reinforcing steel plate, the rigidity and strength of the fatigue crack area of the top plate are enhanced through the reinforcing steel plate, and the shearing force of the steel bridge deck and the reinforcing steel plate is increased through the round dug holes and the special-shaped dug holes in the reinforcing steel plate and the welding nails on the surface of the reinforcing steel plate; and rapid and non-destructive repair of the fatigue cracks of the steel bridge deck is realized.

Description

Technical Field

[0001] The invention belongs to the field of bridge engineering, and in particular relates to a reinforcement structure and method for fatigue cracks of a steel bridge deck cover. 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 reinforcement structure and method for fatigue cracks of a steel bridge deck cover plate, so as to solve the above-mentioned problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A reinforcement structure for fatigue cracks in a steel bridge deck cover, comprising: a steel bridge deck top plate, a steel bridge deck U-shaped stiffening rib, a steel mesh, a reinforcing steel plate, a top plate rivet 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 pasted within the range of fatigue cracks on the top plate of the steel bridge deck top plate, a plurality of the 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 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, special-shaped holes and circular holes are provided on the reinforcement steel plate.

[0009] Furthermore, the special-shaped hole is continuous and closed near the fatigue crack of the top plate, and a notch is provided away from the fatigue crack of the top plate, and the width of the notch is 1 / 4 of the length of the special-shaped hole along the long side of the reinforced steel plate.

[0010] Furthermore, the top plate rivets are welded in the special-shaped holes and are close to the notches; the bottom ends of the top plate rivets pass through the special-shaped holes and are welded to the upper surface of the steel bridge deck top plate, and the top ends are connected to the steel mesh.

[0011] Furthermore, it also includes reinforcement steel plate surface welding nails, a plurality of the reinforcement steel plate surface welding nails are on the edges of the two wide sides of the reinforcement steel plate and on both sides of the notch, the bottom ends of the reinforcement steel plate surface welding nails are welded to the upper surface of the reinforcement steel plate, and the top ends are connected to the steel mesh.

[0012] A method for reinforcing fatigue cracks of a steel bridge deck cover comprises the following steps:

[0013] S1. Cut the reinforcement steel plate according to the fatigue cracks of the top plate, and open special-shaped holes and circular holes on the reinforcement steel plate;

[0014] 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 multiple top plate rivets on the top plate of the steel bridge deck, and weld them on the top plate of the steel bridge deck through the special-shaped holes; evenly weld multiple reinforcement steel plate surface rivets on the reinforcement steel plate;

[0015] S3. The steel mesh is installed on the top of multiple top plate rivets and multiple reinforcement steel plate surface rivets;

[0016] 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.

[0017] 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.

[0018] 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.

[0019] The beneficial effects of the present invention are:

[0020] 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 rigidity and strength of the cracked area of ​​the top plate of the steel bridge deck, and opens a special-shaped hole and a circular hole on the reinforcing steel plate. The top plate welding nails on the top plate surface of the steel bridge deck pass upward from the special-shaped hole with a larger area, and the circular hole with a smaller area is arranged between the two special-shaped holes. At the two types of openings, the post-cast ultra-high performance cement-based material layer can be directly bonded to the top plate of the steel bridge deck, and the bonding interface can resist part of the steel bridge deck. The interface shear force between the top plate and the reinforced steel plate improves the collaborative working ability between the two; the multiple reinforced steel plate surface rivets welded on the edge of the upper surface of the reinforced steel plate form a force balance with the top plate rivets welded on the surface of the steel bridge deck top plate in the horizontal shear direction, ensuring that the bonding interface will not slip, and further ensuring the force safety of the interface between the steel bridge deck top plate and the reinforced steel plate; the top plate rivets welded on the steel bridge deck top plate can also limit the peeling between the reinforced steel plate and the steel bridge deck top plate by resisting pull-out force;

[0021] 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

[0022] 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.

[0023] Figure 1 The plan layout of the fatigue crack reinforcement structure for the steel bridge deck cover;

[0024] Figure 2 for Figure 1 AA section layout drawing;

[0025] Figure 3 for Figure 1 BB section layout drawing;

[0026] Figure 4 for Figure 1 CC section layout drawing;

[0027] Figure 5 for Figure 1 DD section layout drawing;

[0028] Figure 6 The plan layout of the reinforcement steel plate;

[0029] Among them, in the figure:

[0030] 1-top plate of steel bridge deck, 2-weld nails on top plate, 3-U-shaped stiffening ribs of steel bridge deck, 4-steel mesh, 5-fatigue cracks on top plate, 6-reinforced steel plate, 7-weld nails on surface of reinforced steel plate, 8-special-shaped holes, 9-circular holes, 10-ultra-high performance cement-based material layer. DETAILED DESCRIPTION

[0031] 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.

[0032] Example 1

[0033] See attached Figure 1-6 As shown, the present invention provides a reinforcement structure for fatigue cracks of a steel bridge deck cover plate, comprising: a steel bridge deck top plate 1, a steel bridge deck U-shaped stiffening rib 3, a steel mesh 4, a reinforcing steel plate 6, a top plate welding nail 2 and an ultra-high performance cement-based material layer 10; a plurality of steel bridge deck U-shaped stiffening ribs 3 are evenly fixed on the lower surface of the steel bridge deck top plate 1, the reinforcing steel plate 6 is pasted within the range of the top plate fatigue crack 5 on the steel bridge deck top plate 1, a plurality of 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 nail 2, and the ultra-high performance cement-based material layer 10 is cast above the steel bridge deck top plate 1, the reinforcing steel plate 6 and the steel mesh 4.

[0034] In a preferred embodiment, due to the insufficient long-term reliability of epoxy resin glue, high-strength bolts are generally required to assist in strengthening the connection between the existing steel structure and the reinforced steel plate 6, which will bring new damage to the existing steel structure; in order to solve this problem, special-shaped holes 8 and circular holes 9 are cut on both sides of the length direction of the reinforced steel plate 6. The special-shaped holes 8 have larger areas, and the top plate welding nails 2 on the surface of the steel bridge deck top plate 1 pass upward from there. The circular holes 9 have smaller areas and are arranged between the two special-shaped holes 8; at both types of openings, the post-cast ultra-high performance cement-based material layer 10 can be directly bonded to the steel bridge deck top plate 1, and the bonding interface can resist part of the interface shear force between the steel bridge deck top plate 1 and the reinforced steel plate 6, thereby enhancing the coordinated force performance between the reinforced steel plate 6 and the steel bridge deck top plate 1 and the ultra-high performance cement-based material layer 10.

[0035] In a preferred embodiment, the special-shaped hole 8 is continuous and closed near the fatigue crack 5 of the top plate, and a gap is set on the side away from the fatigue crack 5 of the top plate. The width of the gap is 1 / 4 of the length of the special-shaped hole 8 along the long side direction of the reinforced steel plate 6, so as to ensure that the ultra-high performance cement-based material layer 10 can not only continuously contact the steel bridge deck top plate 1, but also limit the possible slippage between the reinforced steel plate 6 and the steel bridge deck top plate 1.

[0036] In a preferred embodiment, a top plate rivet 2 is welded in the special-shaped hole 8, and the top plate rivet 2 in the special-shaped hole 8 is close to the notch; the bottom end of the top plate rivet 2 passes through the special-shaped hole 8 and is welded to the upper surface of the steel bridge deck top plate 1, and the top end is connected to the steel mesh 4.

[0037] In a preferred embodiment, a reinforcement structure for fatigue cracks of a steel bridge deck cover plate also includes reinforcement steel plate surface rivets 7, and multiple reinforcement steel plate surface rivets 7 are located at the edges of the two wide sides of the reinforcement steel plate 6 and on both sides of the notch. The bottom ends of the reinforcement steel plate surface rivets 7 are welded to the upper surface of the reinforcement steel plate 6, and the top ends are connected to the steel mesh 4. The reinforcement steel plate surface rivets 7 on both sides of the notch are simultaneously close to the top plate rivets 2 near the notch. The horizontal shear force of the top plate rivets 2 near the notch in the transverse direction of the bridge is balanced by the two reinforcement steel plate surface rivets 7 at the corresponding positions, ensuring that the reinforcement steel plate 6 and the steel bridge deck top plate 1 are fully coordinated in force during normal use of the bridge, and further ensuring the force safety of the interface between the steel bridge deck top plate 1 and the reinforcement steel plate 6.

[0038] Example 2

[0039] A method for reinforcing fatigue cracks of a steel bridge deck cover comprises the following steps:

[0040] S1. According to the fatigue crack of the top plate 5, the reinforcing steel plate 6 is cut, and the special-shaped holes 8 and the circular holes 9 are opened on the reinforcing steel plate 6;

[0041] 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. 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. Heavy objects are used to compact the steel plate 6 for a certain period of time to ensure the pasting effect. The reinforcement steel plate 6 is pasted within the range of the fatigue crack 5 on the top plate of the steel bridge deck top plate 1, and multiple top plate welding nails 2 are evenly welded on the steel bridge deck top plate 1, and welded on the steel bridge deck top plate 1 through the special-shaped holes 8; multiple reinforcement steel plate surface welding nails 7 are evenly welded on the reinforcement steel plate 6 at intervals;

[0042] S3. The steel mesh 4 is installed on the top of a plurality of top plate rivets 2 and a plurality of reinforced steel plate surface rivets 7;

[0043] S4. Cast an ultra-high performance cement-based material layer 10 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.

[0044] This method can avoid causing new damage to the steel bridge deck top plate 1. The welding nails respectively arranged on the upper surface of the steel bridge deck top plate 1 and the reinforcing steel plate 6 can ensure that the interface of the two steel plates will not slip. The welding nails welded on the steel bridge deck top plate 1 can also limit the peeling between the reinforcing steel plate 6 and the steel bridge deck top plate 1 by resisting pull-out force.

[0045] 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.

[0046] 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 reinforcement structure for fatigue cracks in a steel bridge deck cover, characterized in that: include: A steel bridge deck top plate (1), a steel bridge deck U-shaped stiffening rib (3), a steel mesh (4), a reinforcing steel plate (6), a top plate welding nail (2) and an ultra-high performance cement-based material layer (10); a plurality of the steel bridge deck U-shaped stiffening ribs (3) are evenly fixed on the lower surface of the steel bridge deck top plate (1), the reinforcing steel plate (6) is adhered within the range of the top plate fatigue crack (5) on the steel bridge deck top plate (1), 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 the ultra-high performance cement-based material layer (10) is cast above the steel bridge deck top plate (1), the reinforcing steel plate (6) and the steel mesh (4).

2. A reinforcement structure for fatigue cracks in a steel bridge deck cover according to claim 1, characterized in that: The reinforcing steel plate (6) is provided with a special-shaped hole (8) and a circular hole (9).

3. A reinforcement structure for fatigue cracks in a steel bridge deck cover according to claim 2, characterized in that: The special-shaped hole (8) is continuous and closed on the side close to the fatigue crack (5) of the top plate, and a notch is provided on the side away from the fatigue crack (5) of the top plate, and the width of the notch is 1 / 4 of the length of the special-shaped hole (8) along the long side direction of the reinforcing steel plate (6).

4. A reinforcement structure for fatigue cracks in a steel bridge deck cover according to claim 3, characterized in that: The top plate welding nail (2) is welded in the special-shaped hole (8) and is close to the notch; the bottom end of the top plate welding nail (2) passes through the special-shaped hole (8) and is welded to the upper surface of the steel bridge deck top plate (1), and the top end is connected to the steel mesh (4).

5. A reinforcement structure for fatigue cracks in a steel bridge deck cover according to claim 4, characterized in that: It also includes reinforcement steel plate surface welding nails (7), a plurality of the reinforcement steel plate surface welding nails (7) are located at the edges of the two wide sides of the reinforcement steel plate (6) and on both sides of the notch, the bottom ends of the reinforcement steel plate surface welding nails (7) are welded to the upper surface of the reinforcement steel plate (6), and the top ends are connected to the steel mesh (4).

6. A method for reinforcing fatigue cracks in a steel bridge deck cover, characterized in that: The steps include: S1. Cutting the reinforcing steel plate (6) according to the fatigue crack of the top plate (5), and opening a special-shaped hole (8) and a circular hole (9) on the reinforcing steel plate (6); S2. Paste the reinforcing steel plate (6) within the range of the fatigue crack (5) on the top plate of the steel bridge deck (1), and evenly weld a plurality of top plate welding nails (2) on the top plate of the steel bridge deck (1), and weld them on the top plate of the steel bridge deck (1) through the special-shaped holes (8); evenly weld a plurality of reinforcing steel plate surface welding nails (7) on the reinforcing steel plate (6); S3. The steel mesh (4) is installed on the top of a plurality of top plate rivets (2) and a plurality of reinforced steel plate surface rivets (7); S4. Casting an ultra-high performance cement-based material layer (10) above the steel bridge deck top plate (1), the reinforcement steel plate (6) and the steel mesh (4) to complete the reinforcement work.

7. A method for reinforcing fatigue cracks of a steel bridge deck cover according to claim 6, characterized in that: In step S2, before the reinforcing steel plate (6) is pasted to the fatigue crack (5) 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.

8. A method for reinforcing fatigue cracks of a steel bridge deck cover according to claim 6, 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.

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