A combined reinforcing structure for reinforcing a cracked steel bridge deck by adding a fiber reinforced layer

Abstract

The application discloses a combined reinforcing structure for reinforcing a cracked steel bridge deck by adding a fiber reinforced layer, and has the characteristics that the combined reinforcing structure comprises a cracked steel bridge deck, a fiber reinforced composite material layer, a shear connecting piece, a steel bar net and a concrete layer; the shear connecting piece is arranged on the fiber reinforced composite material layer; the fiber reinforced composite material layer is laid on a cracking position of the cracked steel bridge deck; the steel bar net is arranged on the cracked steel bridge deck; and the concrete layer is poured on the cracked steel bridge deck and covers the shear connecting piece, the steel bar net and the cracked steel bridge deck.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of bridge structures for steel bridge deck reinforcement, in particular, a kind of combined reinforcement structure for solving the cracked steel bridge deck of additional fiber reinforced layer. BACKGROUND

[0002] Since the orthotropic steel bridge deck has been invented, it is favored by bridge designers due to its light weight, large ultimate bearing capacity, wide application range, short construction period, low beam height, beautiful shape, especially suitable for long-span bridges. However, with the increase of service life, due to the uneven structural stiffness, combined with large traffic volume of bridges in China, serious overload, and other factors, the disadvantages are increasingly prominent, and the steel bridge deck has two major diseases of different fatigue cracking and pavement damage. The main girder of the well-known Guangdong Humen Bridge built in China adopts steel box girder, and the deck slab adopts orthotropic steel bridge deck. After operation, different degrees of fatigue damage, cracking disease and even damage occur, which greatly reduces the carrying capacity and traffic capacity of the bridge, and weight and speed limits must be taken, and the service life is also greatly shortened. For the two major diseases, various reinforcement schemes are proposed, and the patent "A light combined reinforcement structure for repairing the cracked steel bridge deck without fatigue" proposes that the steel plate with welded short studs is spot-welded to the cracked bridge deck, and the short studs are welded to the bridge deck. Finally, super high performance concrete is poured to form a combined reinforcement structure to achieve the reinforcement effect.

[0003] However, the structure still has many problems: 1. Due to large traffic flow, serious overload and harsh external environment, the cracked bridge deck is not reinforced, and the steel bridge deck has the risk of further corrosion, cracking and even damage; 2. The steel plate strip is spot-welded to the cracked bridge deck, which cannot be tightly combined with the cracked bridge deck, and there must be a gap, which has the risk of corrosion, and cannot bear stress with the original bridge deck; 3. The steel plate strip has a large density, and too many steel plate strips will increase the self-weight of the bridge and reduce the bearing capacity; the super high performance concrete used generally needs high temperature steam curing, and the construction process is complex; 4. Welding a large number of studs on the cracked steel bridge deck will introduce welding residual stress, and even form new cracks, which further weakens the bearing capacity of the steel bridge deck. SUMMARY

[0004] The purpose of the present application is to provide a kind of reinforcement structure for the cracked steel bridge deck, which has reliable bonding, good fatigue resistance and simple construction.

[0005] The technical scheme adopted by the present application to solve its technical problems is: it comprises a fatigue-cracked steel bridge deck, a fiber-reinforced composite layer, a shear connector, a steel mesh and a concrete layer, the shear connector is arranged on the fiber-reinforced composite layer, the fiber-reinforced composite layer is laid on the cracked part of the fatigue-cracked steel bridge deck, the steel mesh is arranged on the fatigue-cracked steel bridge deck, and the concrete layer is poured on the fatigue-cracked steel bridge deck and covers the shear connector, the steel mesh and the fatigue-cracked steel bridge deck.

[0006] The cracked part of the fatigue-cracked steel bridge deck of the present application is laid with two or more fiber-reinforced composite layers, and the shear connector is arranged on the steel bridge deck between adjacent fiber-reinforced composite layers.

[0007] The concrete layer of the present application can also use lightweight aggregate concrete, and the lightweight aluminum sheet can form four schemes: ultra-high performance concrete + steel sheet, ultra-high performance concrete + aluminum sheet, lightweight aggregate concrete + steel sheet, and lightweight aggregate + aluminum sheet.

[0008] The fiber-reinforced composite layer of the present application comprises a fiber-reinforced material strip and a metal sheet, such as a steel sheet, a carbon fiber sheet and a carbon fiber cloth strip, the fiber-reinforced material strip is located at the bottom end of the fiber-reinforced composite layer, and the metal sheet is slightly larger than the fiber-reinforced material strip and is arranged on the fiber-reinforced material strip; the fiber-reinforced material (such as carbon fiber cloth CFRP) has physical properties similar to cloth and cannot be connected to the steel bridge deck by the shear connector, the fiber-reinforced material is closely adhered to the bridge deck by organic glue without gaps, and the main purposes are to prevent further corrosion of the steel bridge deck and to inhibit further expansion of the cracks of the steel bridge deck.

[0009] If the fiber-reinforced composite layer of the present application uses a steel sheet, the top surface can be welded with shear connectors such as studs, steel bars, T-shaped steel, L-shaped steel and PBL open-hole steel plates; if a carbon fiber reinforced plate is used, the top surface can be bonded with T-shaped steel or T-shaped carbon fiber profiles, L-shaped steel or L-shaped carbon fiber profile shear connectors; if a carbon fiber cloth strip is used, no shear key is arranged thereon due to its very small thickness.

[0010] The fiber-reinforced composite layer with shear keys of the present application is bonded to the top surface of the cracked steel bridge deck along the transverse direction of the bridge by organic structural glue, and cooperates with the bottom surface of the ultra-high performance concrete to bear tension, so as to make up for the deficiency of the fatigue-cracked steel bridge deck; the bonding by the organic structural glue can ensure that the reinforcing strip is closely attached to the original steel bridge deck, avoids gaps and improves the cooperative stress between the two.

[0011] The fiber reinforced composite material layer of the application is provided with one or more than one shear connector, the fiber reinforced material is cemented with the steel bridge deck plate; the metal strip is slightly wider than the fiber reinforced material layer, is tightly combined with the FRP layer through cementing, is combined with the steel bridge deck plate through welding, bolting or cementing, so that the stress can be borne together and the gap can be prevented from being anticorrosive; the connector is generally connected with the metal strip and the bridge deck plate through welding and cannot be connected with the fiber reinforced material.

[0012] The fiber reinforced material strip of the fiber reinforced composite material of the application is tightly combined with the already cracked steel bridge deck plate through cementing material, the shear connector is tightly combined with the metal strip of the fiber reinforced composite material through welding, bolting or cementing and polishes and grinds the steel bridge deck plate.

[0013] The length of the fiber reinforced composite material layer of the application is equal to the width of the already cracked steel bridge deck plate, the metal strip can be provided in the fiber reinforced composite material layer and is positioned on the steel bridge deck plate through the connecting mode including welding, cementing and bolting.

[0014] The shear connector of the application includes a stud, a T-shaped steel, an angle steel, an L-shaped steel, a reinforcing bar connector, a PBL perforated steel plate connector, a T-shaped carbon fiber profile and an L-shaped carbon fiber profile shear connector, and the shear key is arranged in the gap area between adjacent reinforced strips in the fiber reinforced composite material layer.

[0015] The fiber reinforced composite material layer of the application can be made into a carbon fiber cloth or a carbon fiber strip and is placed on the already cracked steel bridge deck plate for use.

[0016] The steel mesh of the application is a multi-layer steel mesh, the steel mesh is divided into two layers in the longitudinal and transverse bridge directions, the transverse bridge direction steel is arranged in the upper layer and the longitudinal bridge direction steel is arranged in the lower layer, the longitudinal and transverse bridge direction steels can be in the form of binding at the intersection position, the steel mesh is located below and / or above the fiber reinforced composite material layer; the steel mesh is composed of longitudinal and transverse steels which are staggered and laid with a spacing of 20-70 mm between adjacent steels, and the diameter of the steel is 8-16 mm.

[0017] The concrete layer of the application is provided with a wearing layer, the wearing layer includes asphalt concrete and resin.

[0018] The application reinforces the original bridge deck plate, fills the cracks through glue injection and protects the steel bridge deck plate through painting.

[0019] The application uses the FRP strip (such as carbon fiber cloth) to tightly combine with the cracked steel plate, solves the gap problem between the steel strip and the cracked bridge deck plate and solves the possible corrosion problem.

[0020] The present application can appropriately reduce the number of steel strips, and can also use aluminum strips, or a mixture of the two, and the width of the strips should be slightly larger than the width of the FRP strips, and the metal strips (steel and / or aluminum strips) can be connected to the steel bridge deck plate by welding (spot welding, full welding), gluing, and bolting.

[0021] The steel bridge deck plate and the metal strips (steel and / or aluminum strips) of the present application do not use shear keys or use a small number of bolts, or use a small number of shear keys with greater rigidity (profiled steel, reinforcement, PBL connectors), etc.

[0022] The fiber-reinforced material of the present application is tightly bonded to the steel bridge deck plate by adhesive material, and the steel bridge deck plate can be polished and polished if necessary.

[0023] Further, the length of the metal strip is equal to the width of the steel bridge deck plate that has been cracked due to fatigue, and the width is determined according to the specific situation, and the metal strip is positioned on the steel bridge deck plate by various reliable connection methods (such as welding, gluing, bolting, etc.).

[0024] Further, the metal strip can be laid between the gaps between the bolts, or can be in the form of a perforated steel plate.

[0025] Further, the height of the short bolt is 30-50mm, and the diameter is 10-25mm.

[0026] Further, the combined reinforcing structure further comprises a plurality of layers of reinforcement mesh arranged in the concrete layer, and the reinforcement mesh is located below and / or above the metal strip. The reinforcement mesh is composed of longitudinal reinforcement and transverse reinforcement laid in an alternating manner with a spacing of 20-70mm between adjacent reinforcement, and the diameter of the reinforcement is 8-16mm.

[0027] The present application also includes a steel bridge deck plate that has been cracked due to fatigue, a reinforcing strip (a shear connector can be arranged on the reinforcing strip) bonded to the cracked steel bridge deck plate, a shear connector welded to the original steel bridge deck plate, a reinforcement mesh, an ultra-high performance concrete layer, and a wearing layer, the reinforcing strip is bonded to the cracked steel bridge deck plate in the transverse direction by organic structural adhesive, the reinforcement mesh is placed on the cracked steel bridge deck plate, the ultra-high performance concrete layer is poured on the cracked steel bridge deck plate and covers the reinforcing strip, the shear connector, and the reinforcement mesh, and the wearing layer is poured on the ultra-high performance concrete layer.

[0028] The reinforcing strip of the present application can be a steel plate strip, a carbon fiber plate strip, or a carbon fiber cloth strip. If a steel plate strip is used, shear connectors such as stud bolts, steel bars, T-shaped steel, L-shaped steel, PBL perforated steel plates, etc. can be welded on the top surface. If a carbon fiber reinforced plate is used, T-shaped steel or T-shaped carbon fiber profiles, L-shaped steel or L-shaped carbon fiber profiles shear connectors can be bonded on the top surface. If a carbon fiber cloth strip is used, no shear key is arranged on it due to its very thin thickness.

[0029] The reinforcing strip with shear keys (if any) of the present application is bonded on the top surface of the cracked steel bridge deck slab in the transverse direction by organic structural adhesive, and cooperates with the ultra-high performance concrete bottom surface to bear tension, so as to make up for the deficiency of the original steel bridge deck slab fatigue cracking. By bonding with organic structural adhesive, the reinforcing strip can be closely bonded with the original steel bridge deck slab, avoiding gaps and improving the cooperative stress between the two.

[0030] The shear keys are welded on the cracked steel bridge deck slab of the present application. The shear keys can be in the form of T-shaped steel, L-shaped steel, PBL perforated steel plate, etc. The shear keys are arranged in the gap area between adjacent reinforcing plates.

[0031] The steel mesh of the present application is arranged above the cracked steel bridge deck slab and the reinforcing strip, and is staggered with the position of the shear keys. The steel mesh is divided into two layers in the longitudinal and transverse directions. The steel mesh mainly plays a role in reinforcing the ultra-high performance concrete layer, wherein the transverse steel is arranged in the upper layer, the longitudinal steel is arranged in the lower layer, and the longitudinal and transverse steels can be in the form of binding at the intersection position.

[0032] The ultra-high performance concrete of the present application refers to a cement-based composite material without coarse aggregate, mixed with silica fume and other active components, mixed with steel fibers, with a water-binder ratio not more than 0.25, a compressive strength not less than 100 MPa, and a tensile strength not less than 5 MPa. The ultra-high performance concrete is laid on the top of the steel bridge deck slab, covering the reinforcing strip, the shear key and the steel mesh.

[0033] The present application proposes a light-weight combined reinforcing structure for the cracked steel bridge deck slab, which improves the rigidity of the bridge deck, avoids the continuous expansion of the fatigue cracks of the steel bridge deck, and prolongs the service life of the steel bridge deck. Compared with the prior art, the reinforcing strip in the present application can be in the form of a steel plate strip, a carbon fiber plate strip, or a carbon fiber cloth strip. If a steel plate strip or a carbon fiber plate strip is used, shear keys can be pre-welded or bonded on the reinforcing strip. If a carbon fiber cloth strip is used, no shear key is needed on it, and the reinforcing strip only needs to be bonded on the top surface of the original steel bridge deck slab by organic structural adhesive, which can ensure the close bonding of the reinforcing strip with the original steel bridge deck slab and reduce the difficulty of on-site construction. In the gap between adjacent reinforcing plates, T-shaped steel, L-shaped steel, PBL perforated steel plate, etc. are welded on the original steel bridge deck slab as shear keys. Compared with small stud bolts, the shear strength and rigidity of these shear keys are greatly improved, so that the arrangement density of the shear keys can be reduced, and the on-site welding workload can also be reduced.

[0034] Therefore, the reinforcing strip in the application can be combined with the original steel bridge deck plate closely, avoiding the problem of insufficient anti-cracking strength of the ultra-high performance concrete bottom surface caused by fatigue cracking of the original steel bridge deck plate. Meanwhile, the reinforcing strip and the shear key are simple to construct and firmly combined, having great application value and economic benefits, and having a broad application prospect in the reinforcement of old steel bridge decks.

[0035] The beneficial effects of the application are: 1. The FRP material is cemented with the steel bridge deck plate without leaving gaps, and has corrosion prevention function. The metal strip cannot simply be considered as reinforcement of the steel bridge deck plate, and also improves the tensile capacity of the concrete bottom layer, which is also the structure stress, 2. The arrangement of the bolts should consider that the original patent has a weakening effect due to a large number of welds on the bridge deck plate. The bolts in the present application are arranged on the bridge deck according to the actual situation, which is more reasonable. 3. The use of the expression of the concrete layer can cover a wider range, including lightweight aggregate concrete. Lightweight aggregate concrete has the advantages of light self-weight, low elastic modulus, high toughness, good anti-deformation capacity, good anti-permeability and good heat insulation. It can effectively solve the problems of cracking, displacement, heave and waterproofing of the upper pavement layer, and can be appropriately mentioned. The characteristics of ultra-high performance concrete are compared.

[0036] The steel mesh in the concrete layer improves the tensile and shear capacity of the concrete layer in the transverse and longitudinal directions of the bridge.

[0037] Different shear connectors are arranged according to different stress requirements, which is more in line with the stress requirements.

[0038] By using the steel bridge deck plate reinforcement technology of the application, the possibility of re-cracking of the cracked steel bridge deck plate is basically eliminated. The steel bridge deck plate with cracks can still be used as a permanent component to serve in the entire design cycle, prolonging its fatigue life and improving the durability of the bridge deck system. The steel bridge deck plate reinforcement technology of the application has the advantages of reinforcing the cracked steel bridge deck plate, good tensile resistance of the ultra-high performance concrete layer bottom surface, reliable bonding of the metal strip and the concrete layer, good fatigue resistance, simple construction and the like, and has great use value and good economic benefits. In the field of steel bridge construction, it has a broad application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a structural schematic view (one) of the application;

[0040] Figure 2 is a side sectional view of Figure 1 ;

[0041] Figure 3 is a structural schematic view (two) of the application;

[0042] Figure 4 is a side sectional view (one) of Figure 3 ;

[0043] Figure 5 is Figure 3 side view (II).

[0044] In the figure: 1 - Fatigue cracked steel bridge deck, 2 - Fiber reinforced composite layer, 3 - Shear connector, 4 - Steel mesh, 5 - Concrete layer, 6 - Wearing course. DETAILED DESCRIPTION

[0045] The application will be further described in detail below in conjunction with the accompanying drawings and examples.

[0046] Example 1, the present application includes fatigue cracked steel bridge deck, fiber reinforced FRP material, metal strip, shear connector and concrete layer.

[0047] The fatigue cracked steel bridge deck can be arranged with studs according to actual conditions, if arranged with studs, the interval is 100-300mm, the FRP material is tightly adhered to the steel bridge deck with adhesive material.

[0048] The metal strip is firmly linked with the steel bridge deck through reliable connection, the shear key is arranged on the metal strip, then two or more layers of steel mesh are arranged, the steel mesh spacing is to be determined, and finally the concrete layer is poured, see Figures 1 to 5 .

[0049] Example 2, the present application can also include fatigue cracked steel bridge deck, fiber reinforced composite material layer, shear connector, steel mesh and concrete layer, the shear connector is arranged on the fiber reinforced composite material layer, the fiber reinforced composite material layer is laid to the cracked part of the fatigue cracked steel bridge deck, and is tightly adhered to the steel bridge deck by epoxy resin glue, the steel mesh is arranged on the fatigue cracked steel bridge deck, and the concrete layer is poured on the fatigue cracked steel bridge deck and covers the shear connector, the steel mesh and the fatigue cracked steel bridge deck, see Figures 1 to 5 , the rest is the same as any one of the above examples or the combination of two or more examples.

[0050] Example 3, the present application fatigue cracked steel bridge deck is provided with shear connector, the fiber reinforced composite material layer is laid to the cracked part of the fatigue cracked steel bridge deck, the steel mesh is arranged on the fatigue cracked steel bridge deck, the concrete layer is poured on the fatigue cracked steel bridge deck and covers the shear connector, the steel mesh and the fatigue cracked steel bridge deck, see Figures 1 to 5 , the rest is the same as any one of the above examples or the combination of two or more examples.

[0051] Example 4, the concrete layer of the present application, can also use lightweight aggregate concrete, plus the weight of the aluminum sheet, can form four kinds of scheme, ultra-high performance concrete + steel sheet, ultra-high performance concrete + aluminum sheet, lightweight aggregate concrete + steel sheet, lightweight + aluminum sheet, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0052] Example 5, the fiber reinforced composite layer of the present application includes a fiber reinforced material strip, a metal sheet strip, such as a steel sheet strip, a carbon fiber sheet strip, a carbon fiber cloth strip, the fiber reinforced material strip is located at the bottom end of the fiber reinforced composite layer, and the metal sheet strip is slightly larger than the fiber reinforced material strip and is placed on the fiber reinforced material strip; the fiber reinforced material (such as carbon fiber cloth CFRP) has physical properties similar to cloth and cannot be connected to the steel bridge deck using shear connectors, and the fiber reinforced material is tightly adhered to the bridge deck panel using organic glue without leaving gaps, the main purpose is to prevent further corrosion of the steel bridge deck panel and to inhibit the further expansion of cracks in the steel bridge deck, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0053] Example 6, if the fiber reinforced composite layer of the present application uses a steel sheet strip, shear connectors such as studs, steel bars, T-shaped steel, L-shaped steel, PBL perforated steel plate can be welded on the top surface; if a carbon fiber reinforced plate is used, T-shaped steel or T-shaped carbon fiber profile shear connectors can be bonded on the top surface; if a carbon fiber cloth strip is used, no shear key is provided on it due to its very thin thickness, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0054] Example 7, the fiber reinforced composite layer with shear keys of the present application is bonded to the top surface of the cracked steel bridge deck panel along the transverse bridge direction by organic structural glue, and cooperates with the bottom surface of the ultra-high performance concrete to bear tension, so as to make up for the deficiency of the original steel bridge deck panel fatigue cracking; by bonding with organic structural glue, the reinforcing strip can be tightly attached to the original steel bridge deck panel to avoid gaps and improve the cooperative stress between the two, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0055] Example 8, one or more shear connectors are provided on the fiber reinforced composite layer of the present application, the fiber reinforced material is glued to the steel bridge deck panel; the metal sheet strip is slightly wider than the fiber reinforced material layer and is tightly combined with the FRP layer by gluing, and is combined with the steel bridge deck panel by welding, bolting or gluing, so that it can bear stress together and has no gap to prevent corrosion; the three connectors are generally connected to the metal sheet strip and the bridge deck panel by welding and cannot be connected to the fiber reinforced material, see Figures 1 to 5The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0056] In Example 9, the fiber reinforced composite material strips of the present application are tightly bonded to the fatigue cracked steel bridge deck panel by adhesive material, and the shear connectors are tightly bonded to the metal strips of the fiber reinforced composite material by welding, bolting or adhesive, and the steel bridge deck panel is polished, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0057] In Example 10, the length of the fiber reinforced composite material layer of the present application is equal to the width of the fatigue cracked steel bridge deck panel, and the metal strips can be provided in the fiber reinforced composite material layer, and the metal strips are positioned on the steel bridge deck panel by connection methods including welding, adhesive, bolting, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0058] In Example 11, the shear connector of the present application includes a stud, a T-shaped steel, an angle steel, an L-shaped steel, a reinforcing bar connector, a PBL perforated steel plate connector, a T-shaped carbon fiber profile, and an L-shaped carbon fiber profile shear connector, and the shear key is arranged in the gap area between adjacent reinforced strips in the fiber reinforced composite material layer, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0059] In Example 12, the fiber reinforced composite material layer of the present application can be made into a carbon fiber cloth or a carbon fiber strip and placed on the fatigue cracked steel bridge deck panel, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0060] In Example 13, the reinforcing mesh of the present application is a multi-layer reinforcing mesh, which is divided into two layers of longitudinal and transverse bridge directions, wherein the transverse bridge direction steel is arranged in the upper layer, and the longitudinal bridge direction steel is arranged in the lower layer, and the longitudinal and transverse bridge direction steels can be in the form of binding at the intersection position, and the reinforcing mesh is located below and / or above the fiber reinforced composite material layer; the reinforcing mesh is composed of longitudinal and transverse steels laid in staggered manner with a spacing of 20-70mm between adjacent steels, and the diameter of the steel is 8-16mm, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0061] In Example 14, a wearing course is provided on the concrete layer of the present application, which includes asphalt concrete and resin, see Figures 1 to 5 The rest is the same as any of the above embodiments or a combination of two or more embodiments.

[0062] In Example 15, the original bridge deck panel is reinforced, the cracks are filled by glue injection, and the steel bridge deck panel is protected by painting, seeFigures 1 to 5 The rest is the same as any one of the above embodiments or a combination of two or more embodiments.

[0063] In Embodiment 16, the FRP lath (such as carbon fiber cloth) of the present application is combined with the cracked steel plate to solve the problem of the gap between the steel lath and the cracked bridge deck plate, and to solve the problem of possible corrosion, as shown in Figures 1 to 5 The rest is the same as any one of the above embodiments or a combination of two or more embodiments.

[0064] In Embodiment 17, the number of steel laths can be appropriately reduced, and aluminum laths or a mixture of the two can be used. The width of the lath should be slightly larger than that of the FRP lath. The metal lath (steel and / or aluminum lath) can be connected to the steel bridge deck plate by welding (spot welding, full welding), gluing, and bolting. Other concrete materials (such as lightweight aggregate concrete) can also be used. By arranging multiple layers of steel reinforcement, the tensile strength can meet the engineering requirements, while reducing the self-weight of the structure and improving the bearing capacity. The construction process is simple and the cost is low, as shown in Figures 1 to 5 The rest is the same as any one of the above embodiments or a combination of two or more embodiments.

[0065] In Embodiment 18, the steel bridge deck plate and the metal lath (steel and / or aluminum lath) do not use shear keys or use a small number of bolts, or use a small number of shear keys with greater stiffness (such as steel, steel reinforcement, PBL connectors), as shown in Figures 1 to 5 The rest is the same as any one of the above embodiments or a combination of two or more embodiments.

[0066] In Embodiment 19, the fiber-reinforced material is tightly bonded to the steel bridge deck plate by adhesive material, and the steel bridge deck plate is polished and polished as needed.

[0067] Further, the length of the metal lath is equal to the width of the cracked steel bridge deck plate, and the width is determined according to the specific situation. The metal lath is positioned on the steel bridge deck plate by various reliable connection methods (such as welding, gluing, bolting, etc.).

[0068] Further, the height of the short bolt is 30-50mm, and the diameter is 10-25mm.

[0069] Further, the height of the short bolt is 30-50mm, and the diameter is 10-25mm.

[0070] Further, the combined reinforcing structure further includes a plurality of layers of steel reinforcement arranged in the concrete layer, and the steel reinforcement is located below and / or above the metal lath. The steel reinforcement is composed of longitudinal steel reinforcement and transverse steel reinforcement laid in a staggered manner with a spacing of 20-70mm between adjacent steel reinforcement, and the diameter of the steel reinforcement is 8-16mm, as shown in Figures 1 to 5The rest is the same as any one of the above embodiments or a combination of two or more embodiments.

[0071] In embodiment 20, the present application further comprises a fatigue-cracked steel bridge deck, a reinforcing strip (a shear connector can be optionally arranged on the reinforcing strip) bonded to the cracked steel bridge deck, a shear connector welded to the original steel bridge deck, a steel mesh, an ultra-high performance concrete layer, and a wearing layer, the reinforcing strip is bonded to the cracked steel bridge deck in the transverse direction of the bridge by organic structural adhesive, the steel mesh is arranged on the cracked steel bridge deck, the ultra-high performance concrete layer is poured on the cracked steel bridge deck and covers the reinforcing strip, the shear connector, and the steel mesh, and the wearing layer is poured on the ultra-high performance concrete layer.

[0072] The reinforcing strip of the present application can be a steel strip, a carbon fiber strip, or a carbon fiber cloth strip. If a steel strip is used, shear connectors such as studs, steel bars, T-shaped steel, L-shaped steel, and PBL open-hole steel plates can be welded to the top surface; if a carbon fiber reinforcing plate is used, T-shaped steel or T-shaped carbon fiber profiles, L-shaped steel or L-shaped carbon fiber profile shear connectors can be bonded to the top surface; and if a carbon fiber cloth strip is used, no shear key is arranged thereon due to its very thin thickness.

[0073] The reinforcing strip with a shear key (if any) of the present application is bonded to the top surface of the cracked steel bridge deck in the transverse direction of the bridge by organic structural adhesive, and cooperates with the bottom surface of the ultra-high performance concrete to bear tension, so as to make up for the deficiency of the original steel bridge deck fatigue cracking. By bonding with organic structural adhesive, the reinforcing strip can be closely attached to the original steel bridge deck, gaps can be avoided, and the cooperative stress between the two can be improved.

[0074] The shear key is welded to the cracked steel bridge deck of the present application. The shear key can be in the form of T-shaped steel, L-shaped steel, PBL open-hole steel plate, etc., and is arranged in the gap region between adjacent reinforcing strips.

[0075] The steel mesh of the present application is arranged above the cracked steel bridge deck and the reinforcing strip, and is staggered with the position of the shear key. The steel mesh is divided into two layers in the longitudinal and transverse directions of the bridge. The steel mesh mainly plays a role of strengthening the ultra-high performance concrete layer, wherein the transverse steel is arranged in the upper layer, the longitudinal steel is arranged in the lower layer, and the longitudinal and transverse steels can be in the form of binding at the intersection position.

[0076] The ultra-high performance concrete of the present application refers to a cement-based composite material without coarse aggregate, mixed with silica fume and other active components, mixed with steel fibers, with a water-binder ratio not more than 0.25, a compressive strength not less than 100 MPa, and a tensile strength not less than 5 MPa. The ultra-high performance concrete is laid above the steel bridge deck and covers the reinforcing strip, the shear key, and the steel mesh.

[0077] The present application is directed to a light-weight combined reinforcing structure for a cracked steel bridge deck, which improves the rigidity of the bridge deck, avoids the further expansion of the fatigue cracks of the steel bridge deck, and prolongs the service life of the steel bridge deck. Compared with the prior art, the reinforcing strips in the present application can be in the form of steel strips, carbon fiber strips, carbon fiber cloth strips, etc. If steel strips or carbon fiber strips are used, shear keys can be pre-welded or glued on the reinforcing strips. If carbon fiber cloth strips are used, no shear keys are needed on the carbon fiber cloth strips, and the reinforcing strips only need to be glued to the top surface of the original steel bridge deck by organic structural adhesive, which can ensure the close bonding of the reinforcing strips to the original steel bridge deck and reduce the difficulty of on-site construction. Between adjacent reinforcing strips, T-shaped steel, L-shaped steel, PBL perforated steel plates and other shear keys are welded on the original steel bridge deck. Compared with small bolts, the shear strength and stiffness of these shear keys are greatly improved, thereby reducing the arrangement density of the shear keys and also reducing the on-site welding workload. See ​ the rest is the same as any one of the above embodiments or a combination of two or more embodiments.

Claims

1. A combined reinforcement structure for addressing cracked steel bridge decks by adding a fiber-reinforced layer, characterized in that: It includes a fatigued and cracked steel bridge deck, a fiber-reinforced composite material layer, shear connectors, a steel mesh, and a concrete layer. The shear connectors are installed on the fiber-reinforced composite material layer. The fiber-reinforced composite material layer is laid to the cracked portion of the fatigued and cracked steel bridge deck. The steel mesh is placed on the fatigued and cracked steel bridge deck. The concrete layer is poured onto the fatigued and cracked steel bridge deck and covers the shear connectors. The steel mesh is connected to the fatigued and cracked steel bridge deck. The fiber-reinforced composite material layer includes fiber-reinforced material strips and metal strips. The fiber-reinforced material strips are located at the bottom of the fiber-reinforced composite material layer. The metal strips are slightly larger than the fiber-reinforced material strips and are placed on the fiber-reinforced material strips.

2. The combined reinforcement structure for addressing cracked steel bridge decks by adding a fiber reinforcement layer as described in claim 1, characterized in that: The cracked parts of the fatigue-cracked steel bridge deck are covered with two or more fiber-reinforced composite material layers, and shear connectors are installed on the steel bridge deck between adjacent fiber-reinforced composite material layers.

3. The combined reinforcement structure for addressing cracked steel bridge decks by adding a fiber reinforcement layer as described in claim 2, characterized in that: The fiber-reinforced material strips are tightly bonded to the fatigue-cracked steel bridge deck using adhesive materials. The shear connectors are tightly bonded to the metal strips by welding, bolting, or adhesive bonding. The steel bridge deck is then polished.

4. The combined reinforcement structure for addressing cracked steel bridge decks by adding a fiber reinforcement layer as described in claim 1 or 2, characterized in that: The fiber-reinforced composite material layer has one or more shear connectors.

5. The combined reinforcement structure for addressing cracked steel bridge decks by adding a fiber reinforcement layer as described in claim 1 or 2, characterized in that: The length of the fiber-reinforced composite layer is equal to the width of the fatigue-cracked steel bridge deck.

6. The combined reinforcement structure for addressing cracked steel bridge decks by adding a fiber reinforcement layer as described in claim 1 or 2, characterized in that: The shear connectors include studs, T-shaped steel, angle steel, reinforcing bar connectors, PBL perforated steel plate connectors, T-shaped carbon fiber profiles, and L-shaped carbon fiber profile shear connectors.

7. The combined reinforcement structure for addressing cracked steel bridge decks by adding a fiber reinforcement layer as described in claim 1 or 2, characterized in that: The reinforcing mesh is a multi-layered reinforcing mesh, consisting of two layers: longitudinal and transverse. The transverse reinforcing bars are arranged in the upper layer, and the longitudinal reinforcing bars are arranged in the lower layer. The longitudinal and transverse reinforcing bars can be tied at their intersections. The reinforcing mesh is located below and / or above the fiber-reinforced composite material layer. The reinforcing mesh consists of longitudinal and transverse reinforcing bars laid in an alternating pattern with adjacent bars spaced 20-70mm apart. The diameter of the reinforcing bars is 8-16mm.

8. The combined reinforcement structure for addressing cracked steel bridge decks by adding a fiber reinforcement layer as described in claim 7, characterized in that: The transverse and longitudinal reinforcing bars of the steel mesh can be arranged at uneven intervals, with the bars being denser closer to the crack.

9. The combined reinforcement structure for addressing cracked steel bridge decks by adding a fiber reinforcement layer as described in claim 1 or 2, characterized in that: The concrete layer is provided with a wear layer, which includes asphalt concrete and resin.

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