CN107053702A - Steel member reinforcement process based on vacuum suction method - Google Patents

Abstract

A steel member reinforcement process based on the vacuum negative pressure method is to apply sealant around the area where the damaged steel member needs to be reinforced, and then spread carbon fiber cloth, polyester release cloth and diversion vinyl mesh cloth in sequence; When the vinyl resin in the resin container is filled with the vacuum bag, let the inner resin infiltrate the fiber. After the vinyl resin is fully cured, tear off the polyester release cloth and complete. reinforcement. The present invention realizes the use of fiber reinforced composite material cloth to reinforce steel members through the flow and penetration of vinyl resin. The number of fiber layers of fiber reinforced composite materials for steel members reinforced by this method can be designed and laid according to needs, and can better fit the reinforcement surface , suitable for reinforcement of complex curved steel structures, its process is simple, easy to operate, no environmental pollution, low cost, and the interface mechanical properties after reinforcement are excellent.

Description

Strengthening Technology of Steel Components Based on Vacuum Negative Pressure Method

technical field

The invention relates to a reinforced concrete structure reinforcement technology, in particular to a steel member reinforcement technology based on a vacuum negative pressure method.

Background technique

Steel structures are used in bridges, long-span buildings, structures, coastal and offshore engineering, Petrochemical pressure vessels, pipelines, tower masts, etc. With the rapid development of the economy, especially the construction of a large number of industrial plants and some large venues require a large number of steel structures. Various defects may occur in the process of design, manufacture, and construction. In use, due to overload, corrosion, fatigue and other reasons, the damage of the structure will be accumulated, thus affecting the safety of the structure. The traditional steel structure reinforcement method is to weld steel plates, bolts, rivet or bond CFRP to the damaged parts of the original structure. Some new problems, such as new damage and welding residual stress or debonding due to the interface, etc. In addition, due to the characteristics of the steel structure material itself and its structure, the corrosion of its material and buckling instability failure are its important failure forms.

Fiber Reinforced Polymer (FRP) is a high-performance new structural material formed by mixing fiber materials and matrix materials in a certain proportion and compounding them through a certain process. It has light weight, high strength, fatigue resistance, corrosion resistance and convenient construction. And other significant advantages, it was first used in military and aerospace fields. In civil engineering, FRP cloth is currently applied to the tension or shear surface area of the component, but this reinforcement method has been widely used and has become an important supplement to traditional structural materials such as concrete and steel. However, this manual paste The biggest disadvantage of this method is the dripping of excess resin glue during the pasting process and the uneven thickness of the adhesive layer at the bonding interface due to manual rolling and the poor surface smoothness of the reinforced structure.

Contents of the invention

The object of the present invention is to provide a steel member reinforcement process based on vacuum negative pressure method, which is simple in operation, low in cost, free from environmental pollution, and has excellent interface mechanical properties after reinforcement.

The steel component reinforcement process based on the vacuum negative pressure method of the present invention comprises the following steps:

1. Erase and clean the rusty part on the surface of the damaged steel component, and apply sealant around the area that needs to be reinforced;

2. Spread carbon fiber cloth according to the principle that the reinforcement center area is thick and the sides are thin, and then lay polyester release cloth and diversion vinyl mesh cloth in turn;

3. Lay the vacuum bag again, the vacuum bag is connected with the sealant around the upper and lower sides of the area that needs to be reinforced, and set the resin injection port and the air extraction port to check the air tightness of the vacuum bag to ensure that the air tightness of the separated area of the vacuum bag is good;

4. Add 1-3% curing agent to the vinyl resin and stir evenly. Install a PE pipe between the resin injection port and the resin container, set a resin injection valve on the PE pipe, and connect the air suction port to the resin collector through the PE pipe. , the resin collector is connected with the vacuum pump at the same time;

5. Close the resin injection valve, turn on the vacuum pump to evacuate, and then open the resin injection valve. When the vinyl resin in the resin container is full of the vacuum bag, turn off the vacuum pump to allow the internal resin to fully infiltrate the fiber;

6. After the vinyl resin is fully cured, the reinforcement of the steel components is completed after the polyester release cloth is torn off.

The steel component reinforcement process based on the vacuum negative pressure method of the present invention realizes the reinforcement of steel components with fiber reinforced composite material cloth through the flow and penetration of vinyl resin, and the number of fiber layers of fiber reinforced composite materials for reinforcing steel components in this method can be designed according to needs It is suitable for the reinforcement of complex curved steel structures. Its process is simple, easy to operate, no environmental pollution, low cost, and the interface mechanical properties after reinforcement are excellent.

Description of drawings

Fig. 1 is the technical structure schematic diagram of the present invention;

1. Vinyl resin, 2. Resin container, 3. Resin injection valve, 4. PE pipe, 5. Resin injection port, 6. Air extraction port, 7. Resin collector, 8. Air extraction valve, 9. Vacuum pump, 10 , Damaged steel components, 11, sealant, 12, carbon fiber cloth, 13, polyester release cloth, 14, diversion vinyl mesh, 15, vacuum bag.

detailed description

A steel component reinforcement process based on a vacuum negative pressure method, comprising the following steps:

1. Wipe and clean the rusty part on the surface of the damaged steel member 10, and apply sealant 11 around the area to be reinforced;

2. Spread carbon fiber cloth 12 according to the principle that the reinforcement center area is thick and the sides are thin, and then lay polyester release cloth 13 and diversion vinyl mesh cloth 14 in sequence;

3. Lay the vacuum bag 15 again, the vacuum bag 15 is connected with the sealant 11 around the area to be reinforced, and set the resin injection port 5 and the air extraction port 6, check the airtightness of the vacuum bag 15, and ensure that the vacuum bag 15 separates the area Good air tightness;

4. Add 1-3% curing agent to vinyl resin 1 and stir evenly, install PE pipe 4 between resin injection port 5 and resin container 1, set resin injection valve 3 on PE pipe 4, and pump air port 6 through The PE pipe 4 is connected with the resin collector 7, and the resin collector 7 is connected with the vacuum pump 9 at the same time;

5. Close the resin injection valve 3, turn on the vacuum pump 7 to evacuate, then open the resin injection valve 3, and when the vinyl resin 2 in the resin container 1 fills the vacuum bag 15, turn off the vacuum pump 9 to allow the internal resin to fully infiltrate the fiber;

6. After the vinyl resin is fully cured, the polyester release cloth 13 is torn off to complete the reinforcement of the steel member.

Claims (1)

1. a kind of steel member reinforcement process based on vacuum suction method, it is characterised in that：It comprises the following steps：

（1）, by impaired steel member（10）The rusty part on surface is wiped and cleaned out, and is coated in the area peripheral edge that needs reinforcement close Sealing（11）；

（2）, spread carbon cloth according to reinforcing the principle that central area is thick, side is thin（12）, and terylene release cloth is spread successively （13）With water conservancy diversion ethene screen cloth（14）；

（3）, be then covered with vacuum bag（15）, vacuum bag（15）With the fluid sealant for the area peripheral edge that needs reinforcement（11）It is connected, and sets Resin inlet（5）And bleeding point（6）；

（4）, to vinylite（1）Add the curing agent of 1-3% ratios and stir, in resin inlet（5）Hold with resin Device（1）Between install PE pipe（4）, PE pipes（4）Upper setting resin injects valve（3）, bleeding point（6）Managed by PE（4）With resin Collector（7）It is connected, resin trap（7）While and vavuum pump（9）Connection；

（5）, close resin injection valve（3）, open vavuum pump（7）After vacuumizing, then open resin injection valve（3）, work as tree Fat container（1）Interior vinylite（2）The full vacuum bag of stream（15）When, close vavuum pump（9）, allow internal resin fully to infiltrate fibre Dimension；

（6）, after vinylite fully solidifies, tear terylene release cloth off（13）The reinforcing of steel member is completed afterwards.