Composite gasket for steel structure high-strength bolt connection gap defects and filling and repairing method

Abstract

The invention discloses a composite gasket for steel structure high-strength bolt connection gap defects and a filling and repairing method. The composite gasket comprises a progressive combined gasket and epoxy structural adhesive. The progressive combined gasket comprises a plurality of circular ring segments which are spliced to form a circular ring structure. The circular ring segment comprises a plane base layer and a plurality of plane supplement layers, and the plurality of plane supplement layers are symmetrically arranged on the top surface and the bottom surface of the plane base layer; a plurality of notches are formed in the sides, close to the steel pipes, of the plane foundation layer and the plane supplement layers, and the notches are matched with the bolt holes in diameter; a through hole is formed in the plane base layer, and the epoxy structural adhesive is poured into the circular ring structure through the through hole; wherein the side walls of the plane base layer and the plane supplement layers abut against the outer wall of the steel pipe, and the thickness of the plane base layer is larger than that of the plane supplement layers. The mechanical property and durability of the flange joint can be repaired at the same time, and the method has the advantages of being high in structural strength, good in durability, wide in applicability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure defect repair, in particular to a composite gasket used for gap defects in high-strength bolt connections of steel structures and a filling and repairing method. Background Art

[0002] Steel structure is a type of building structure that uses steel as the main material. It is widely used in the construction field due to its high strength, high reliability and high degree of industrialization. The basic components of steel structure, such as beams, columns and trusses, are connected by steel plates and steel sections. After being transported to the construction site, they are installed and connected to form the overall structure. Steel structure connections usually include welding, riveting and bolting. Among them, bolt connections are divided into ordinary bolt connections and high-strength bolt connections according to the material strength and prestressing size.

[0003] When high-strength bolts are used to connect components, a special wrench is required to tighten the nut with a large torque to produce a large prestress on the screw. The prestress of the high-strength bolts clamps the connected components, causing a large friction force between the contact surfaces of the components, and the external force is transmitted through friction. This type of connection is called a high-strength bolt friction connection, which is popular because of its advantages such as easy installation, easy replacement, and no need for on-site welding. However, the high-strength bolt friction connection has high requirements for the accuracy of the component length, and sometimes gaps will occur on the contact surface during the assembly process.

[0004] In the presence of gap defects, the prestress of high-strength bolts cannot clamp the connected parts, resulting in the loss of friction between the parts, thereby reducing the stiffness and integrity of the high-strength bolt connection. In addition, gap defects cause the bolts to come into direct contact with the air, causing the bolt surface to gradually rust, thereby reducing the durability of the high-strength bolt connection. However, at present, there are few means to repair gap defects in high-strength bolt connections, and it is urgent to develop an effective gap defect repair method to repair the stiffness loss and durability reduction of high-strength bolt connections.

[0005] Therefore, a composite gasket and a filling and repairing method for gap defects in high-strength bolt connections of steel structures are proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a composite gasket and a filling and repair method for gap defects in high-strength bolt connections of steel structures, aiming to solve or improve at least one of the above-mentioned technical problems.

[0007] To achieve the above object, the present invention provides the following solutions: The present invention provides a composite gasket for gap defects in high-strength bolt connections of steel structures, comprising a progressive combined gasket and an epoxy structural adhesive;

[0008] The progressive composite gasket comprises a plurality of circular ring segments, which are spliced ​​to form a circular ring structure; the circular ring segment comprises a planar base layer and a plurality of planar supplementary layers, which are symmetrically arranged on the top and bottom surfaces of the planar base layer;

[0009] The plane base layer and the plane supplementary layers are provided with a plurality of slots on one side close to the steel pipe, and the slots are adapted to the diameter of the bolt holes;

[0010] The planar base layer is provided with a through hole, and the epoxy structural adhesive is poured into the inside of the annular structure through the through hole;

[0011] The side walls of the planar base layer and the plurality of planar supplementary layers are in contact with the outer wall of the steel pipe, and the thickness of the planar base layer is greater than the thickness of the planar supplementary layer.

[0012] According to the composite gasket for gap defects in high-strength bolt connections of steel structures provided by the present invention, the inner diameter of the annular structure is smaller than the outer diameter of the steel pipe.

[0013] According to the composite gasket for gap defects in high-strength bolt connections of steel structures provided by the present invention, the number of the planar supplementary layers is an even number, and the number of the planar supplementary layers located on the top surface of the planar base layer is equal to the number of the planar supplementary layers located on the bottom surface of the planar base layer.

[0014] The present invention also provides a filling and repairing method for high-strength bolt connection gap defects in steel structures, comprising the following steps:

[0015] Step 1: Remove the bolts;

[0016] Step 2, gap defect measurement: the gap between the first flange plate and the second flange plate is divided into a plurality of regional gaps, the plurality of regional gaps correspond to the plurality of circular ring segments one by one, and the thickness of each regional gap is measured respectively;

[0017] Step 3, assembling the ring segment: filling a plane base layer in one of the regional gaps, symmetrically arranging a plane supplementary layer group on the top and bottom surfaces of the plane base layer to form a single ring segment as a whole; the plane supplementary layer group includes a plurality of plane supplementary layers stacked in sequence, and the plane supplementary layer group adopts a progressive arrangement strategy, and the progressive arrangement strategy is specifically that the thickness of the plurality of plane supplementary layers decreases in sequence in a direction away from the plane base layer;

[0018] Step 4. Bolt Replacement: After filling the ring segment in the area gap in step 3, install the replacement bolt and tighten it;

[0019] Step 5: Fill the ring segments: Repeat steps 3 to 4 until the gaps in each area are filled and the bolts are replaced;

[0020] Step 6: Filling epoxy structural adhesive: After the bolts are replaced, inject epoxy structural adhesive into the inside of the ring segment through the through hole;

[0021] Step 7: Apply anti-rust paint.

[0022] According to the filling and repairing method for high-strength bolt connection gap defects in steel structures provided by the present invention, the specific process of applying anti-rust paint is as follows:

[0023] Clean contact surfaces;

[0024] Apply anti-rust primer to the circumferential areas of the composite gasket, the first flange plate, and the second flange plate;

[0025] After curing and drying, apply anti-rust intermediate paint on the anti-rust primer;

[0026] After curing and drying, apply anti-rust topcoat on the anti-rust midcoat;

[0027] Repair completed.

[0028] According to the filling and repairing method for gap defects in high-strength bolt connections of steel structures provided by the present invention, the specific process of cleaning the contact surface is: spraying alcohol on the circumferential area of ​​the composite gasket, the first flange plate and the second flange plate, and then wiping the sprayed area with a fine fiber cloth.

[0029] According to the method for filling and repairing gap defects in high-strength bolt connections of steel structures provided by the present invention, in step one, a measuring tool is used to measure the thickness of the gap in each area respectively; the measuring tool includes but is not limited to a vernier caliper.

[0030] According to the method for filling and repairing gap defects in high-strength bolt connections of steel structures provided by the present invention, the planar base layer and the plurality of planar supplementary layers are all prefabricated parts.

[0031] The present invention discloses the following technical effects:

[0032] The present invention adopts a progressive combined gasket to fill the gap between the first flange plate and the second flange plate, and the plane supplementary layer group adopts a progressive arrangement strategy, so that the thickness of the plane supplementary layer arranged first is the largest, and the thickness of the plane supplementary layer arranged later gradually decreases in the direction away from the plane base layer according to the arrangement order until the gap is tightly filled; the effect of changing the overall thickness of the progressive combined gasket is achieved through the number and thickness of the plane supplementary layers, and the thickness difference between the annular segment and the flange gap can be well supplemented through multiple gap compensations, so that it can be suitable for bridging the gap of most flange joints and repairing the stiffness of the gap flange joint;

[0033] After the bolts are replaced, the epoxy structural adhesive is poured into the interior of the circular ring segment through the through holes on the plane base layer, and anti-rust paint is applied, so as to improve the durability and corrosion resistance of the flange bolt joint and improve the structural strength of the flange bolt joint.

[0034] In the present invention, the notches of the plane base layer and the plane supplementary layer are adapted to the diameter of the bolt hole, ensuring that the ring segment will not collide with the screw during the filling process, and the side walls of the plane base layer and the plurality of plane supplementary layers abut against the outer wall of the steel pipe, ensuring that the force on the steel pipe can be directly transmitted to the composite gasket;

[0035] The flange bolt joint repaired by the composite gasket of the present invention has a significantly improved rigidity due to the increased contact area of ​​the flange plate, so that the flange joint can transfer load more effectively and reduce the loss of bearing capacity caused by deformation and stress concentration; compared with the existing forced assembly repair method, it can reduce the assembly stress inside the bolt, thereby reducing the possibility of brittle fracture of the bolt;

[0036] The filling and repairing method of the present invention can simultaneously repair the mechanical properties and durability of the flange joint, and has the advantages of high structural strength, good durability and wide applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a structural schematic diagram of the composite gasket for filling the flange gap in the present invention;

[0039] Figure 2 It is a schematic diagram of the unreinforced flange structure;

[0040] Figure 3 It is a schematic diagram of the anti-rust paint of the flange joint after repair in the present invention;

[0041] Figure 4 It is a structural schematic diagram of the progressive combined gasket in the present invention;

[0042] Figure 5 is a schematic diagram of the ring structure in the present invention;

[0043] Figure 6 Schematic diagram of the structure of the ring fragment in the present invention.

[0044] Among them, 1. Flange as a whole; 11. First flange plate; 12. Second flange plate; 13. First steel pipe; 14. Second steel pipe; 15. Bolt hole; 16. Screw; 17. Nut; 2. Progressive combination gasket; 21. Ring structure; 211. Ring segment; 2111. Plane base layer; 2112. Plane supplementary layer; 2113. Through hole; 22. Epoxy structural adhesive; 3. Anti-rust paint; 31. Anti-rust primer; 32. Anti-rust intermediate paint; 33. Anti-rust topcoat. DETAILED DESCRIPTION

[0045] 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.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] Reference Figure 1-Figure 6 The present invention provides a composite gasket for gap defects in high-strength bolt connections of steel structures, comprising a progressive composite gasket 2 and an epoxy structural adhesive 22; a flange assembly 1 comprising a first flange plate 11, a second flange plate 12, a first steel pipe 13, a second steel pipe 14, a bolt hole 15, a screw rod 16 and a nut 17;

[0048] The progressive composite gasket 2 includes a plurality of circular ring segments 211, which are spliced ​​to form a circular ring structure 21; the circular ring segment 211 includes a planar base layer 2111 and a plurality of planar supplementary layers 2112, and the plurality of planar supplementary layers 2112 are symmetrically arranged on the top and bottom surfaces of the planar base layer 2111;

[0049] A plurality of slots are provided on the side of the planar base layer 2111 and the plurality of planar supplementary layers 2112 close to the steel pipe, and the slots are adapted to the diameter of the bolt holes 15;

[0050] A through hole 2113 is formed on the planar base layer 2111, and the epoxy structural adhesive 22 is poured into the inside of the circular ring structure 21 through the through hole 2113; the through hole 2113 is located in the central area between the plurality of notches;

[0051] The side walls of the plane base layer 2111 and the plurality of plane supplementary layers 2112 are in contact with the outer wall of the steel pipe, and the thickness of the plane base layer 2111 is greater than the thickness of the plane supplementary layer 2112;

[0052] In this way, the present invention adopts a progressive combined gasket to fill the gap between the first flange plate 11 and the second flange plate 12, and the plane supplementary layer group adopts a progressive arrangement strategy, so that the thickness of the first arranged plane supplementary layer 2112 is the largest, and the thickness of the later arranged plane supplementary layer 2112 gradually decreases in the direction away from the plane base layer 2111 according to the arrangement order until the gap is tightly filled; the effect of changing the overall thickness of the progressive combined gasket 2 is achieved through the number and thickness of the plane supplementary layer 2112, and the thickness difference between the annular segment 211 and the flange gap can be better supplemented through multiple gap compensations. Under the action of the bolt preload, no crushing phenomenon will occur, and it can be applied to the gap bridging of most flange joints and repair the stiffness of the gap flange joint;

[0053] After the bolts are replaced, the epoxy structural adhesive 22 is poured into the inside of the circular ring segment 211 through the through hole 2113 on the plane base layer 2111, and the anti-rust paint 3 is applied, so as to improve the durability and corrosion resistance of the flange bolt joint and improve the structural strength of the flange bolt joint;

[0054] In the present invention, the notches of the plane base layer 2111 and the plane supplementary layer 2112 are adapted to the diameter of the bolt hole 15, ensuring that the ring segment 211 will not collide with the screw 16 during the filling process, and the side walls of the plane base layer 2111 and the plurality of plane supplementary layers 2112 abut against the outer wall of the steel pipe, ensuring that the force on the steel pipe can be directly transmitted to the composite gasket;

[0055] The flange bolt joint repaired by the composite gasket of the present invention has a significantly improved rigidity due to the increased contact area of ​​the flange plate, so that the flange joint can transfer load more effectively and reduce the loss of bearing capacity caused by deformation and stress concentration; compared with the existing forced assembly repair method, it can reduce the assembly stress inside the bolt, thereby reducing the possibility of brittle fracture of the bolt;

[0056] The filling and repairing method of the present invention can simultaneously repair the mechanical properties and durability of the flange joint, and has the advantages of high structural strength, good durability and wide applicability.

[0057] In a further optimization scheme, the inner diameter of the circular ring structure 21 is smaller than the outer diameter of the steel pipe, so that the inner diameter edge of the circular ring segment 211 exceeds the projection position of the steel pipe on the flange plate, ensuring that the force on the steel pipe can be directly transmitted to the composite gasket;

[0058] The steel pipe includes a first steel pipe 13 and a second steel pipe 14 . The first steel pipe 13 is connected to the first flange plate 11 , and the second steel pipe 14 is connected to the second flange plate 12 .

[0059] In a further optimization scheme, the number of the planar supplementary layers 2112 is an even number, and the number of the planar supplementary layers 2112 located on the top surface of the planar base layer 2111 is equal to the number of the planar supplementary layers 2112 located on the bottom surface of the planar base layer 2111 .

[0060] According to a further optimization scheme, the number of notches of the planar base layer 2111 and the planar supplementary layer 2112 is determined according to the number of bolts in the regional gap.

[0061] The present invention also provides a method for filling and repairing gap defects in high-strength bolt connections of steel structures, comprising the following steps:

[0062] Step 1, remove the bolts; the bolts include a screw rod 16 and a nut 17; use an appropriate tool (such as a hexagonal wrench or a torque wrench) to remove the bolts in a diagonal alternating order, and after completing the filling of the ring segments and the replacement of the bolts in the current block, start to remove the bolts of a block;

[0063] Step 2, gap defect measurement: the gap between the first flange plate 11 and the second flange plate 12 is divided into a plurality of regional gaps, the plurality of regional gaps correspond to a plurality of circular ring segments 211 one by one, and the thickness of each regional gap is measured respectively;

[0064] Step 3, assembling the ring segment 211: filling a plane base layer 2111 in one of the regional gaps, symmetrically arranging a plane supplementary layer group on the top and bottom surfaces of the plane base layer 2111 to form a single ring segment 211 as a whole; the plane supplementary layer group includes a plurality of plane supplementary layers 2112 stacked in sequence, and the plane supplementary layer group adopts a progressive arrangement strategy, and the progressive arrangement strategy is specifically that the thickness of the plurality of plane supplementary layers 2112 decreases in sequence in a direction away from the plane base layer 2111;

[0065] Step 4: Bolt replacement: After the ring segment 211 is filled into the regional gap in step 3, the replacement bolt is installed and tightened;

[0066] Step 5, filling the ring segment 211: repeating steps 3 to 4 until the gaps in each area are filled and the bolts are replaced;

[0067] Step 6: Filling the epoxy structural adhesive 22: After the bolts are replaced, the epoxy structural adhesive 22 is poured into the interior of the circular ring segment 211 through the through hole 2113;

[0068] Step 7: Apply anti-rust paint 3.

[0069] To further optimize the scheme, the specific process of applying anti-rust paint 3 is as follows:

[0070] Clean contact surfaces;

[0071] Apply anti-rust primer 31 to the circumferential area of ​​the composite gasket, the first flange plate 11 and the second flange plate 12;

[0072] After curing and drying, apply anti-rust intermediate paint 32 on the anti-rust primer 31;

[0073] After curing and drying, an anti-rust topcoat 33 is applied on the anti-rust intermediate paint 32;

[0074] Repair completed.

[0075] To further optimize the solution, the specific process of cleaning the contact surface is: spray alcohol on the circumferential area of ​​the composite gasket, the first flange plate 11 and the second flange plate 12, and then wipe the sprayed area with a fine fiber cloth.

[0076] To further optimize the solution, in step one, a measuring tool is used to measure the thickness of the gap in each area respectively; the measuring tool includes but is not limited to a vernier caliper.

[0077] According to a further optimization scheme, the planar base layer 2111 and the plurality of planar supplementary layers 2112 are all prefabricated parts.

[0078] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0079] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For ordinary technical users in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Composite gasket used for gap defects in high-strength bolt connections of steel structures, characterized by: It comprises a progressive combined gasket (2) and an epoxy structural adhesive (22); The progressive composite gasket (2) comprises a plurality of circular ring segments (211), wherein the plurality of circular ring segments (211) are spliced ​​together to form a circular ring structure (21); the circular ring segment (211) comprises a planar base layer (2111) and a plurality of planar supplementary layers (2112), wherein the plurality of planar supplementary layers (2112) are symmetrically arranged on the top surface and the bottom surface of the planar base layer (2111); The planar base layer (2111) and the planar supplementary layers (2112) are each provided with a plurality of slots on one side close to the steel pipe, wherein the slots are adapted to the diameter of the bolt holes (15); The planar base layer (2111) is provided with a through hole (2113), and the epoxy structural adhesive (22) is poured into the interior of the annular structure (21) through the through hole (2113); The side walls of the planar base layer (2111) and the plurality of planar supplementary layers (2112) are in contact with the outer wall of the steel pipe, and the thickness of the planar base layer (2111) is greater than the thickness of the planar supplementary layers (2112).

2. The composite gasket for gap defects in high-strength bolt connections of steel structures according to claim 1, characterized in that: The inner diameter of the annular structure (21) is smaller than the outer diameter of the steel pipe.

3. The composite gasket for gap defects in high-strength bolt connections of steel structures according to claim 1, characterized in that: The number of the planar supplementary layers (2112) is an even number, and the number of the planar supplementary layers (2112) located on the top surface of the planar base layer (2111) is equal to the number of the planar supplementary layers (2112) located on the bottom surface of the planar base layer (2111).

4. A method for filling and repairing gap defects in high-strength bolt connections of steel structures, based on the composite gasket for gap defects in high-strength bolt connections of steel structures as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Remove the bolts; Step 2, gap defect measurement: the gap between the first flange plate (11) and the second flange plate (12) is divided into a plurality of regional gaps, the plurality of regional gaps correspond to the plurality of circular ring segments (211) one by one, and the thickness of each regional gap is measured respectively; Step 3, assembling the ring segment (211): filling a plane base layer (2111) in a gap in one of the regions, symmetrically arranging a plane supplementary layer group on the top and bottom surfaces of the plane base layer (2111) to form a single ring segment (211) as a whole; the plane supplementary layer group includes a plurality of plane supplementary layers (2112) stacked in sequence, and the plane supplementary layer group adopts a progressive arrangement strategy, wherein the progressive arrangement strategy is specifically that the thickness of the plurality of plane supplementary layers (2112) decreases in sequence in a direction away from the plane base layer (2111); Step 4, bolt replacement: after filling the ring segment (211) in the regional gap in step 3, install the replacement bolt and tighten it; Step 5, filling the ring segment (211): repeating steps 3 to 4 until the gaps in each area are filled and the bolts are replaced; Step 6: Filling the epoxy structural adhesive (22): After the bolts are replaced, the epoxy structural adhesive (22) is poured into the interior of the circular ring segment (211) through the through hole (2113); Step 7: Apply anti-rust paint (3).

5. The method for filling and repairing gap defects in high-strength bolt connections of steel structures according to claim 4, characterized in that: The specific process of applying the anti-rust paint (3) is as follows: Clean contact surfaces; Applying anti-rust primer (31) to the circumferential area of ​​the composite gasket, the first flange plate (11) and the second flange plate (12); After curing and drying, an anti-rust intermediate paint (32) is applied on the anti-rust primer (31); After curing and drying, an anti-rust topcoat (33) is applied on the anti-rust intermediate paint (32); Repair completed.

6. The method for filling and repairing gap defects in high-strength bolt connections of steel structures according to claim 5, characterized in that: The specific process of cleaning the contact surface is: spraying alcohol on the circumferential area of ​​the composite gasket, the first flange plate (11) and the second flange plate (12), and then wiping the sprayed area with a fine fiber cloth.

7. The method for filling and repairing gap defects in high-strength bolt connections of steel structures according to claim 4, characterized in that: In the step 1, a measuring tool is used to measure the thickness of the gap in each area respectively; the measuring tool includes but is not limited to a vernier caliper.

8. The method for filling and repairing gap defects in high-strength bolt connections of steel structures according to claim 4, characterized in that: The planar base layer (2111) and the plurality of planar supplementary layers (2112) are all prefabricated parts.

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