Reinforcing device and method for bolt-welding connection joint of steel-concrete composite structure

Abstract

The invention provides a reinforced concrete composite structure bolt-welding connection node reinforcing device and a reinforcing method thereof, and belongs to the field of reinforced concrete composite structures, the reinforced concrete composite structure bolt-welding connection node reinforcing device comprises a reinforcing plate, and the reinforcing plate is welded on a connection plate at a reinforced concrete composite structure bolt-welding connection node. According to the reinforcing method, the reinforcing plate is welded to the bolt welding connection joint of the steel-concrete composite structure in a welding mode, the strength of the connection joint is improved through the effect of the reinforcing plate, the problems that due to bolt failure, stress at the joint is obviously weakened, and the connection strength is obviously reduced are solved, and potential safety hazards are eliminated.

Description

Technical Field

[0001] The present invention relates to the field of steel-concrete composite structures, and particularly to a reinforcement device and a reinforcement method for bolt-welded connection nodes of steel-concrete composite structures. Background Art

[0002] The steel-concrete composite structure, abbreviated as the steel-concrete composite structure, is a structure in which steel components and concrete or reinforced concrete components are combined into a whole to work together, possessing some characteristics of both steel structures and reinforced concrete structures. It can be used for floor beams, trusses, slabs, columns in multi-story and high-rise buildings, roof slabs, beams, trusses in roof structures, columns, working platform beams, slabs in factories, as well as bridges. In China, it is also used for crane beams in factories. With the increasing application of the steel-concrete composite structure system, in order to solve problems such as comfort, fatigue, and installation, large-size box-section steel beams filled with concrete are adopted, and their connection nodes are bolt-welded splices. When the bolts fail and are difficult to replace, according to the existing steel structure reinforcement specifications, generally bolt-welded combined connections are used for reinforcement. When the bolt-welded combined connection is used for reinforcement of the splicing node, if the failure ratio of the bolts is too high, the connecting plates inside the box girder also fail, and the thickness of the connecting plates outside the box girder is less than that of the web. Only the weld between the connecting plate and the web bears the force, and the force at the node is significantly weakened, and the connection strength is significantly reduced, posing a large potential safety hazard. Summary of the Invention

[0003] The purpose of the present invention is to provide a reinforcement device and a reinforcement method for bolt-welded connection nodes of steel-concrete composite structures to improve the above problems. To achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0004] In a first aspect, the present application provides a reinforcement device for bolt-welded connection nodes of steel-concrete composite structures, characterized in that it includes a reinforcement plate, and the reinforcement plate is welded to the connecting plate at the bolt-welded connection node of the steel-concrete composite structure.

[0005] The cross-section of the reinforcement plate is a U-shaped plate. The U-shaped plate includes a rectangular part and a bent part. The bottom surface of the rectangular part is welded to the top surface of the connecting plate, the side surface of the bent part is welded to the side surface of the connecting plate, and the bottom surface of the bent part is welded to the web of the box girder at the bolt-welded connection node of the steel-concrete composite structure.

[0006] In a second aspect, the present application also provides a reinforcement method for bolt-welded connection nodes of steel-concrete composite structures, characterized in that it includes steps of grinding, pretreatment, welding the reinforcement plate to the connecting plate, and welding the reinforcement plate to the web of the box girder.

[0007] The grinding refers to grinding the connecting plate and the reinforcement plate to remove the burrs on the connecting plate and the reinforcement plate.

[0008] The pretreatment step includes preheating the connecting plate, and the preheating temperature is controlled at 80°C to 120°C.

[0009] The welding step of the reinforcing plate and the connecting plate refers to covering the reinforcing plate on the connecting plate, and welding the bottom surface of the rectangular part of the reinforcing plate and the top surface of the connecting plate together by means of multi-hole plug welding, and welding the bent part of the reinforcing plate and the side surface of the connecting plate together;

[0010] The welding step of the reinforcing plate and the box girder web refers to welding the bent part of the reinforcing plate and the fillet weld at the connection of the box girder web together by submerged arc welding, and the slope of the fillet weld after welding is 45-60°.

[0011] The beneficial effects of the present invention are as follows:

[0012] By adding a reinforcing plate at the bolt-welded connection node of the steel-concrete composite structure, the cross-sectional dimension at the node is not weakened after the bolt fails, and the problem of insufficient reinforcement when using bolts and welds together is solved. The multi-hole plug welding method is adopted to ensure sufficient integrity between the connecting plate and the reinforcing plate, and the actual effective thickness of the web at the node is not weakened, eliminating potential safety hazards.

[0013] Other features and advantages of the present invention will be described in the subsequent description, and some of them will be obvious from the description, or can be understood by implementing the embodiments of the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a schematic structural diagram of the steel-concrete composite structure bolt-welded connection node reinforcement device described in Embodiment 1 of the present invention;

[0016] Figure 2 It is a schematic structural diagram of the reinforcing plate in Embodiment 1 of the present invention;

[0017] Figure 3 It is a schematic structural diagram of the reinforcing plate in Embodiment 2 of the present invention;

[0018] Figure 4 It is a schematic structural diagram of the connecting plate in Embodiment 2 of the present invention;

[0019] Figure 5 It is a schematic structural diagram of the reinforcing plate in Embodiment 3 of the present invention;

[0020] Figure 6 This is a schematic diagram of the connection plate structure in Embodiment 3 of the present invention.

[0021] Markings in the figure: 1, box girder web; 2, connection plate; 20, second truss; 200, T-shaped bump; 201, T-shaped groove; 21, strip bump; 210, strip groove; 22, I-shaped bump; 220, I-shaped groove; 23, annular bump; 230, annular groove; 3, reinforcing plate; 30, rectangular part; 31, bent part; 32, fillet weld; 33, first truss; 330, T-shaped stiffener; 34, straight truss; 35, I-shaped truss; 36, annular truss; 4, bolt. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and illustrated herein generally may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0024] Embodiment 1:

[0025] The bolt splicing joints of the existing steel-concrete composite structure adopt a connection reinforcement method using both bolts and welding. If the failure ratio of the bolts is too high in this method, the connection plate inside the box girder will also fail. Moreover, the thickness of the connection plate outside the box girder is smaller than that of the web, and only the weld between the connection plate and the web bears the force, so the force at the joint will be significantly weakened, which will greatly affect the connection strength of the connection joint and pose a safety hazard. To solve the above defects existing in the existing connection reinforcement method using both bolts and welding. This embodiment provides a steel-concrete composite structure bolt-welding connection joint reinforcement device, and installs this reinforcement device at the splicing joint where bolt failure may occur.

[0026] As Figure 1As shown in the figure, the reinforcement device includes a reinforcement plate 3, which is welded to the connecting plate 2 of the bolt-welded connection node of the steel-concrete composite structure. The bolt 4 passes through the reinforcement plate 3 and the connecting plate 2, and then passes through the box girder web 1 of the bolt-welded connection node of the steel-concrete composite structure. The reinforcement plate 3, the connecting plate 2 and the box girder web 1 are further connected together by the bolt 4.

[0027] As Figure 2 shown in the figure, the overall cross-section of the reinforcement plate 3 is U-shaped, which is formed by bending the left and right sides of a rectangular plate. Specifically, it includes a rectangular part 30 and a bending part 31. The preferred bending angle is 90 degrees. The height of the bending part 31 is equal to the thickness of the connecting plate 2. The left and right sides of the connecting plate 2 are wrapped by the bending part 31. The bottom surface of the rectangular part 30 is welded to the top surface of the connecting plate 2. The inner side surface of the bending part 31 is welded to the outer side surface of the edge of the connecting plate 2. After the bottom surface of the bending part 31 contacts the box girder web 1 at the bolt-welded connection node of the steel-concrete composite structure, welding is carried out at the fillet weld at the corner where the box girder web 1 is connected to the bottom surface of the bending part 31. The welding method is carried out by submerged arc welding, and a fillet weld 32 is formed after welding. The slope of the fillet weld 32 is between 45° and 60 degrees. The preferred angle of the fillet weld 32 is 45°. The welding method between the rectangular part 31 and the connecting plate 2 adopts the method of porous plug welding to ensure sufficient integrity and sufficient connection strength between the connecting plate 2 and the reinforcement plate 3. The connection method between the reinforcement plate 3 and the connecting plate 2 and the connection method between the reinforcement plate 3 and the box girder web 1 can greatly enhance the connection integrity between the reinforcement plate 3, the connecting plate 2 and the box girder web 1. In this way, even if the bolt 4 fails, the reinforcement plate 3 can still connect the connecting plate 2 and the box girder web 1 into a whole, increasing the connection strength between the three. The force at the node will not be significantly weakened, eliminating the potential safety hazard at the connection node. At the same time, the increased thickness of the reinforcement plate 3 is the same as the thickness of the box girder web 1. Coupled with the U-shaped reinforcement plate 3 wrapping the connecting plate 2 and being welded together by the method of porous plug welding, it fully ensures the strength and integrity of the connection between the reinforcement plate 3 and the connecting plate 2. The two plates are stressed simultaneously, which will greatly enhance their overall stress strength. The connection between the U-shaped reinforcement plate 3 and the box girder web 1 is welded by submerged arc welding to form a fillet weld 32. Its slope requirement can fully ensure the connection strength between the two, ensuring that the weld at the connection bears a large force. By connecting the connecting plate and the box girder web 1 into a whole through the reinforcement plate 3, even without the bolt 4, it can fully ensure the connection strength at the connection and there will be no potential safety hazard. Moreover, simply by adding the reinforcement plate 3, it can play a very good strengthening role at the bolt-welded connection node, is easy to transform, has low cost, and is easy to promote and apply.

[0028] Embodiment 2:

[0029] This embodiment provides a reinforcement device for a bolt-welded connection node of a steel-concrete composite structure, which is an optimization based on Embodiment 1.

[0030] As shown Figure 3 in the figure, the first truss 33 and two linear trusses 34 are welded to the bottom surface of the rectangular portion 30 of the reinforcement plate 3. The first truss 33 is formed by overlapping a plurality of T-shaped stiffeners 330. The T-shaped stiffeners 330 include horizontal ribs and vertical ribs. The horizontal ribs of two adjacent T-shaped stiffeners 330 are buckled and overlapped together. One linear truss 34 is arranged on each of the left and right sides of the first truss 33. The end of the vertical rib of each T-shaped stiffener 330 is welded to the linear truss 34.

[0031] As shown Figure 4 in the figure, the second truss 20 and two strip-shaped bumps 21 are welded to the connection plate 2. The strip-shaped bumps 21 are located on the left and right sides of the second truss 20. The second truss 20 includes a plurality of T-shaped bumps 200. The T-shaped bumps 200 include horizontal blocks and vertical blocks. A horizontal groove is provided on the horizontal block, and the horizontal groove penetrates the horizontal block. A vertical groove is provided on the vertical block, and the vertical groove penetrates the vertical block. The horizontal groove and the vertical groove communicate to form a T-shaped groove 201. The horizontal blocks of two adjacent T-shaped bumps 200 are buckled and connected together. A strip-shaped groove 210 is provided on the strip-shaped bump 21. The end of the vertical block of each T-shaped bump 200 is welded to the strip-shaped bump 21. After welding, the vertical groove communicates with the strip-shaped groove 210.

[0032] The reinforcement plate 3 is covered on the connection plate 2. The T-shaped stiffeners 330 are received in the T-shaped grooves 201 and welded in the T-shaped grooves 201 by means of shielded gas welding. One T-shaped stiffener 330 corresponds to one T-shaped groove 201. The linear trusses 34 are received in the strip-shaped grooves 210 and welded in the strip-shaped grooves 210 by means of shielded gas welding. One linear truss 34 corresponds to one strip-shaped groove 210. The connection between the reinforcement plate 3 and other parts of the connection plate 2 is welded and fixed by means of porous plug welding.

[0033] The position of the T-shaped bump 200 on the connecting plate 2 corresponds to the position of the T-shaped stiffener 33, and the quantity is also the same as that of the T-shaped stiffener 33. Its purpose is to limit and position the T-shaped stiffener 33, facilitating the welding of the T-shaped stiffener 33. The T-shaped groove 201 on one T-shaped bump 200 accommodates one T-shaped stiffener 330, and one strip-shaped groove 210 accommodates one linear truss 34. Through the cooperation between the T-shaped groove 201 and the T-shaped stiffener 330, and the cooperation between the linear truss 34 and the strip-shaped groove 210, the connecting plate 2 and the reinforcing plate 3 are positioned and connected and installed, further enhancing the connection strength between the connecting plate 2 and the reinforcing plate 3. The through horizontal groove and vertical groove, as well as the connection between the vertical groove and the strip-shaped groove. After installing multiple T-shaped stiffeners 330 and linear trusses 34, and then through welding, the multiple T-shaped stiffeners 330 and linear trusses are connected into a whole, improving the strength of the overall connection, connecting with each other, jointly bearing tensile stress and compressive stress, which can greatly improve the bearing capacity, further enhancing the connection integrity between the connecting plate 2 and the reinforcing plate 3 and improving the overall connection strength.

[0034] Embodiment 3:

[0035] As Figure 5 and Figure 6 shown, this embodiment provides a steel-concrete composite structure bolt-welded connection joint reinforcement device. This embodiment is a deformation form of Embodiment 2 and can replace Embodiment 2. Specifically, an I-shaped truss 35 and an annular truss 36 are welded on the bottom surface of the rectangular part 30. An I-shaped bump 22 and an annular bump 23 are welded on the connecting plate 2. The I-shaped bump 22 is provided with an I-shaped groove 220, and the annular bump 23 is provided with an annular groove 230. The I-shaped truss 35 is accommodated in the I-shaped groove 220, and the I-shaped truss 35 is welded in the I-shaped groove 220. The annular truss 36 is accommodated in the annular groove 230, and the annular truss 36 is welded in the annular groove 230.

[0036] The I-shaped truss 35 is welded in the I-shaped groove 220, and the annular truss 36 is welded in the annular groove 230. When welding, submerged arc welding is used for welding. The connection method at other places between the connecting plate 2 and the reinforcing plate 3 is connected by plug welding with multiple holes.

[0037] Similarly, through the cooperation between the I-shaped truss 35 and the I-shaped groove 220, and the cooperation between the annular truss 36 and the annular groove 230, the connection strength and integrity between the connecting plate 2 and the reinforcing plate 3 are further enhanced.

[0038] Embodiment 4

[0039] This embodiment provides a reinforcement method for a bolt-welded connection joint of a steel-concrete composite structure, which includes steps of grinding, pretreatment, welding of the reinforcement plate and the connection plate, and welding of the reinforcement plate and the web of the box girder.

[0040] The grinding refers to grinding the connection plate 2 and the reinforcement plate 3 to remove burrs on the connection plate 2 and the reinforcement plate 3.

[0041] The pretreatment step includes preheating the connection plate 2, and the preheating temperature is controlled at 80°C.

[0042] The step of welding the reinforcement plate and the connection plate means covering the reinforcement plate 3 on the connection plate 2. After preheating the reinforcement plate 3, the bottom surface of the rectangular part 30 of the reinforcement plate 3 is welded to the top surface of the connection plate 2 by means of multi-hole plug welding, and the inner side surface of the bent part of the reinforcement plate 3 is welded to the outer side surface of the edge of the connection plate 2.

[0043] The step of welding the reinforcement plate and the web of the box girder means welding the bent part 31 of the reinforcement plate 3 to the fillet weld at the connection with the web 1 of the box girder by means of submerged arc welding. After welding, the slope of the fillet weld 32 is 45°.

[0044] Embodiment 5

[0045] Based on Embodiment 4, the pretreatment step of this embodiment further includes welding treatment of the connection plate 2. The connection plate 2 is preheated, and the preheating temperature is 90°C. After preheating, a plurality of T-shaped bumps 200 are welded on the connection plate 2. The plurality of T-shaped bumps 200 are buckled and overlapped with each other to form a second truss 20. Then, two strip-shaped bumps 21 are welded on the left and right sides of the second truss 20. A T-shaped reinforcing rib 330 is welded in each T-shaped groove 201 of the second truss 20, and a straight truss 34 is welded in the strip-shaped groove 210 of the strip-shaped bump 21. The reinforcement plate 3 is covered on the connection plate 2, and the second truss 20 and the straight truss 34 are welded on the reinforcement plate 3 by means of submerged arc welding.

[0046] The T-shaped reinforcing rib 330 is welded in the T-shaped groove 201, and the straight truss 34 is welded in the strip-shaped groove 210. The specific welding process is as follows:

[0047] Grinding and polishing: The T-shaped reinforcing rib 330, the straight truss 34, the T-shaped bump 200 and the strip-shaped bump 21 are subjected to grinding and polishing treatment to remove burrs.

[0048] Pickling: The T-shaped reinforcing rib 330, the straight truss 34, the T-shaped bump 200 and the strip-shaped bump 21 are placed in acid solution for pickling to remove impurities.

[0049] Alkaline washing: Place the T-shaped stiffener 330, the I-shaped truss 34, the T-shaped bump 200, and the strip-shaped bump 21 in the alkaline solution for alkaline washing to remove grease.

[0050] Water washing: Rinse the T-shaped stiffener 330, the I-shaped truss 34, the T-shaped bump 200, and the strip-shaped bump 21 with high-pressure water.

[0051] Drying: Dry the T-shaped stiffener 330, the I-shaped truss 34, the T-shaped bump 200, and the strip-shaped bump 21 with a dryer.

[0052] Primary welding: Place the T-shaped stiffener 330 in the T-shaped groove 201 of the T-shaped bump 200, and place the I-shaped truss 34 in the strip-shaped groove 210 of the strip-shaped bump 21. Use carbon dioxide and argon gas shielded welding. Control the welding current at 140 A, the weld gap at 0.2 mm, the welding voltage at 24 V, the wire extension at 12 mm, and the gas flow at 8 L. At the junction of the T-shaped stiffener 330 and the T-shaped groove 201, and at the junction of the I-shaped truss 34 and the strip-shaped groove 210, form a circumferential weld with a slope of 45°.

[0053] Secondary welding: Weld the gaps between the T-shaped stiffener 330 and the T-shaped groove 201 and between the I-shaped truss 34 and the strip-shaped groove 210 by submerged arc welding. After welding, the gaps are filled with weld metal.

[0054] The welding of other parts of the connecting plate 2 and the reinforcing plate 3 is carried out by multi-hole plug welding. The fillet weld at the connection between the bent part 31 of the reinforcing plate 3 and the box girder web 1 is welded together by submerged arc welding. After welding, the slope of the fillet weld 32 is 50°.

[0055] Through the control of the above welding process, it fully ensures that the connection between the connecting plate 2 and the reinforcing plate 3 has high strength and strong integrity, can bear the force as a whole. Even if the bolt 4 fails, it will not cause the weakening of the force at the connection, eliminating potential safety hazards.

[0056] Example 6:

[0057] This example is basically the same as Example 6. The difference is that during primary welding, carbon dioxide and argon gas shielded welding is used, the welding current is controlled at 145 A, the weld gap is 0.3 mm, the welding voltage is 26 V, the wire extension is 12 mm, and the gas flow is 9 L.

[0058] Example 7:

[0059] This embodiment is basically the same as Embodiment 6, except that during the first welding, gas shielded arc welding with carbon dioxide and argon is used, the welding current is controlled at 148 A, the weld gap is 0.4 mm, the welding voltage is 28 V, the wire extension is 12 mm, and the gas flow rate is 10 L.

[0060] Embodiment 8:

[0061] This embodiment provides a method for strengthening the bolt-welded connection joint of a steel-concrete composite structure, which includes the steps of grinding, pretreatment, welding the reinforcement plate and the connection plate, and welding the reinforcement plate and the web of the box girder.

[0062] The grinding refers to grinding the connection plate 2 and the reinforcement plate 3 to remove the burrs on the connection plate 2 and the reinforcement plate 3.

[0063] The pretreatment step includes preheating the connection plate 2, with the preheating temperature controlled at 120 °C; after the preheating treatment, welding treatment is performed on the connection plate 2, an I-shaped convex block 22 and a circular convex block 23 are welded on the connection plate 2, and then an I-shaped truss 35 is welded in the I-shaped groove 220 of the I-shaped convex block 22, and a circular truss 36 is welded in the circular groove 230 of the circular convex block 23. When welding, submerged arc welding is used for welding.

[0064] The step of welding the reinforcement plate and the connection plate refers to covering the reinforcement plate 3 on the connection plate 2, and using the multi-hole plug welding method to weld the bottom surface of the rectangular part 30 of the reinforcement plate 3 to the top surface of the connection plate 2, and welding the inner side surface of the bent part of the reinforcement plate 3 to the outer side surface of the edge of the connection plate 2.

[0065] The step of welding the reinforcement plate and the web of the box girder refers to welding the bent part 31 of the reinforcement plate 3 to the fillet weld at the connection with the web of the box girder 1 by submerged arc welding, and the slope of the fillet weld 32 after welding is 60°.

[0066] Embodiment 9:

[0067] This embodiment provides a method for strengthening the bolt-welded connection joint of a steel-concrete composite structure, which includes the steps of grinding, pretreatment, welding the reinforcement plate and the connection plate, and welding the reinforcement plate and the web of the box girder.

[0068] The grinding refers to grinding the connection plate 2 and the reinforcement plate 3 to remove the burrs on the connection plate 2 and the reinforcement plate 3.

[0069] The pretreatment step includes preheating the connection plate 2, with the preheating temperature controlled at 120 °C; after the preheating treatment, welding treatment is performed on the connection plate 2, and an I-shaped convex block 22 and a circular convex block 23 are welded on the connection plate 2; after the connection plate welding is completed, the reinforcement plate 3 is preheated, with the preheating temperature being 80 °C, and after the preheating, an I-shaped truss 35 and a circular truss 36 are welded on the reinforcement plate 3.

[0070] The welding step of the reinforcement plate and the connecting plate refers to covering the reinforcement plate 3 on the connecting plate 2, and welding the bottom surface of the rectangular part 30 of the reinforcement plate 3 and the top surface of the connecting plate 2 by means of multi-hole plug welding, welding the inner side surface of the bent part of the reinforcement plate 3 and the outer side surface of the edge of the connecting plate 2, and welding the I-shaped truss 35 and the annular truss 36 in the I-shaped groove 220 and the annular groove 230 respectively;

[0071] The welding step of the reinforcement plate and the box girder web refers to welding the bent part 31 of the reinforcement plate 3 and the connecting fillet of the box girder web 1 together by means of submerged arc welding, and the slope of the fillet weld 32 after welding is 60°.

[0072] Embodiment 10:

[0073] This embodiment provides a method for strengthening a bolt-welded connection joint of a steel-concrete composite structure, which includes steps of grinding, pretreatment, welding of the reinforcement plate and the connecting plate, and welding of the reinforcement plate and the box girder web.

[0074] The grinding refers to grinding the connecting plate 2 and the reinforcement plate 3 to remove burrs on the connecting plate 2 and the reinforcement plate 3;

[0075] The pretreatment step includes preheating the connecting plate 2, and controlling the preheating temperature at 100°C; after preheating treatment, welding treatment is carried out on the connecting plate 2, and a second truss 20 and two strip-shaped bumps 21 are welded on the connecting plate 2; after the connecting plate welding is completed, the reinforcement plate 3 is preheated, and the preheating temperature is 100°C. After preheating, a first truss 33 and a straight truss 34 are welded on the reinforcement plate 3;

[0076] The welding step of the reinforcement plate and the connecting plate refers to covering the reinforcement plate 3 on the connecting plate 2, and welding the bottom surface of the rectangular part 30 of the reinforcement plate 3 and the top surface of the connecting plate 2 by means of multi-hole plug welding, welding the inner side surface of the bent part of the reinforcement plate 3 and the outer side surface of the edge of the connecting plate 2, and welding the T-shaped reinforcing rib 330 of the first truss 33 and the straight truss 34 in the T-shaped groove 201 and the strip-shaped groove 210 respectively;

[0077] The welding step of the reinforcement plate and the box girder web refers to welding the bent part 31 of the reinforcement plate 3 and the connecting fillet of the box girder web 1 together by means of submerged arc welding, and the slope of the fillet weld 32 after welding is 50°.

[0078] It should be noted that regarding the device in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be elaborated in detail here.

[0079] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0080] As described above, this is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or replacements, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A reinforcement device for bolted and welded connection nodes of a steel-concrete composite structure, characterized in that: It comprises a reinforcing plate (3), wherein the reinforcing plate (3) is welded to a connecting plate (2) at a bolt-welded connection node of a steel-concrete composite structure.

2. The device for reinforcing bolted and welded joints of steel-concrete composite structures according to claim 1 is characterized in that: The reinforcing plate (3) has a U-shaped cross section, the U-shaped plate comprises a rectangular portion (30) and a bent portion (31), the bottom surface of the rectangular portion (30) is welded to the top surface of the connecting plate (2), the side surface of the bent portion (31) is welded to the side surface of the connecting plate (2), and the bottom surface of the bent portion (31) is welded to the box girder web (1) at the bolt-welded connection node of the steel-concrete composite structure.

3. The device for reinforcing bolted and welded joints of steel-concrete composite structures according to claim 2 is characterized in that: A first truss (33) and two straight trusses (34) are arranged on the bottom surface of the rectangular portion (30); the first truss (33) includes a plurality of T-shaped reinforcing ribs (330); the T-shaped reinforcing ribs (330) include transverse ribs and vertical ribs; the transverse ribs of two adjacent T-shaped reinforcing ribs (330) are buckled and connected together; a straight truss (34) is arranged on each of the left and right sides of the first truss (33); and the end of the vertical rib of each T-shaped reinforcing rib (330) is welded to the straight truss (34).

4. The bolt-welded joint reinforcement device for steel-concrete composite structures according to claim 3 is characterized in that: A second truss (20) and two strip-shaped protrusions (21) are welded to the connecting plate (2). The strip-shaped protrusions (21) are located on the left and right sides of the second truss (20). The second truss (20) includes a plurality of T-shaped protrusions (200). The T-shaped protrusions (200) include a horizontal block and a vertical block. The horizontal block is provided with a horizontal groove, which passes through the horizontal block. The vertical block is provided with a vertical groove, which passes through the vertical block. The horizontal groove and the vertical groove are connected to form a T-shaped groove (201). The horizontal blocks of two adjacent T-shaped protrusions (200) are buckled and connected together. The strip-shaped groove is provided on the strip-shaped protrusion (21). (210), the end of the vertical block of each T-shaped protrusion (200) is welded to the strip protrusion (21), and after welding, the vertical groove is connected to the strip groove (210), the T-shaped reinforcing rib (330) is accommodated in the T-shaped groove (201) and welded in the T-shaped groove (201), and one T-shaped reinforcing rib (330) corresponds to one T-shaped groove (201), and the I-shaped truss (34) is accommodated in the strip groove (210) and welded in the strip groove (210), and one I-shaped truss (34) corresponds to one strip groove (210).

5. The device for reinforcing bolted and welded joints of steel-concrete composite structures according to claim 2 is characterized in that: An I-shaped truss (35) and an annular truss (36) are arranged on the bottom surface of the rectangular portion (30); an I-shaped protrusion (22) and an annular protrusion (23) are welded on the connecting plate (2); the I-shaped protrusion (22) is provided with an I-shaped groove (220); the annular protrusion (23) is provided with an annular groove (230); the I-shaped truss (35) is accommodated in the I-shaped groove (220); the I-shaped truss (35) is welded in the I-shaped groove (220); the annular truss (36) is accommodated in the annular groove (230); and the annular truss (36) is welded in the annular groove (230).

6. A method for reinforcing bolted and welded joints of steel-concrete composite structures, characterized in that: Including grinding, pretreatment, welding of reinforcement plate and connecting plate, and welding of reinforcement plate and box beam web. The grinding step refers to grinding the connecting plate (2) and the reinforcing plate (3) to remove burrs on the connecting plate (2) and the reinforcing plate (3); The pretreatment step includes preheating the connecting plate (2), wherein the preheating temperature is controlled at 80° C. to 120° C.; The step of welding the reinforcing plate and the connecting plate comprises covering the reinforcing plate (3) on the connecting plate (2), welding the bottom surface of the rectangular portion (30) of the reinforcing plate (3) and the top surface of the connecting plate (2) together by a multi-hole plug welding method, and welding the bent portion (31) of the reinforcing plate (3) and the side surface of the connecting plate (2) together; The step of welding the reinforcing plate and the box beam web is to weld the corner seam connecting the bent portion (31) of the reinforcing plate (3) and the box beam web (1) together by submerged arc welding, and the slope of the corner weld (32) after welding is 45-60 degrees.

7. A method for reinforcing bolted and welded joints of a steel-concrete composite structure according to claim 6, characterized in that: The pretreatment step also includes welding the connection plate (2), wherein the welding process refers to welding a plurality of T-shaped protrusions (200) on the connection plate (2) to form a second truss (20) after preheating the connection plate (2), then welding two strip protrusions (21) on the left and right sides of the second truss (20), welding a T-shaped reinforcing rib (330) in each T-shaped groove (201) of the second truss (20), welding a straight-line truss (34) in the strip groove (210) of the strip protrusion (21), covering the reinforcing plate (3) on the connection plate (2), and welding the T-shaped reinforcing rib (330) and the straight-line truss (34) to the reinforcing plate (3) by submerged arc welding.

8. A method for reinforcing bolted and welded joints of a steel-concrete composite structure according to claim 7, characterized in that: The T-shaped reinforcing rib (330) is welded in the T-shaped groove (201), and the I-shaped truss (34) is welded in the strip groove (210), and the welding is performed in the following steps: Grinding and polishing: grinding and polishing the T-shaped reinforcement rib (330), the I-shaped truss (34), the T-shaped protrusion (200) and the strip-shaped protrusion (21); Pickling, placing the T-shaped reinforcement rib (330), the I-shaped truss (34), the T-shaped protrusion (200) and the strip protrusion (21) in an acid solution for pickling; Alkali washing, placing the T-shaped reinforcing rib (330), the I-shaped truss (34), the T-shaped protrusion (200) and the strip protrusion (21) in an alkaline solution for alkaline washing; Washing with water, washing the T-shaped reinforcing rib (330), the I-shaped truss (34), the T-shaped protrusion (200) and the strip-shaped protrusion (21) with high-pressure water; Drying: drying the T-shaped reinforcing rib (330), the I-shaped truss (34), the T-shaped protrusion (200) and the strip-shaped protrusion (21) in a drying machine; In one welding process, the T-shaped reinforcing rib (330) is placed in the T-shaped groove (201) of the T-shaped protrusion (200), and the I-shaped truss (34) is placed in the strip groove (210) of the strip protrusion (21), and the welding is performed by using carbon dioxide and argon gas shielded welding, and an annular weld is formed at the junction of the T-shaped reinforcing rib (330) and the T-shaped groove (201), and at the junction of the I-shaped truss (34) and the strip groove (210), and the slope of the annular weld is 45°; Secondary welding is performed by submerged arc welding at the gap between the T-shaped reinforcing rib (330) and the T-shaped groove (201) and at the gap between the I-shaped truss (34) and the strip groove (210), and the gaps are filled with welding.

9. A method for reinforcing bolted and welded joints of a steel-concrete composite structure according to claim 8, characterized in that: During one welding, the welding current is controlled at 140-148A, the weld gap is 0.2-0.4mm, the welding voltage is 24-28V, the wire elongation is 12mm, and the gas flow rate is 8L-10L.

10. A method for reinforcing bolted and welded joints of a steel-concrete composite structure according to claim 6, characterized in that: The pretreatment step also includes welding the connection plate (2). The welding process refers to welding an I-shaped protrusion (22) and an annular protrusion (23) on the connection plate (2) after preheating the connection plate (2), then welding an I-shaped truss (35) in the I-shaped groove (220) of the I-shaped protrusion (22), and welding an annular truss (36) in the annular groove (230) of the annular protrusion (23). During welding, submerged arc welding is used.

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