How to reinforce the frame beam? What methods can be used for beam reinforcement?

Carbon fiber reinforced plastic (carbon fiber reinforced plastic) reinforcement repair concrete structure technology is a new type of reinforcement technology that has emerged in recent years, the technology is to apply carbon fiber this high-performance fiber to civil engineering, the use of tree finger materials to paste carbon fiber on the surface of the structure or component to form a composite material (CFRP), through its collaborative work with the structure or component, to achieve the purpose of reinforcing the structural component and improving the mechanical performance.

Carbon fiber material has the characteristics of high strength, high elastic modulus, light weight and good corrosion resistance, and its tensile strength is about ten times that of ordinary steel bars, and the elastic modulus is slightly higher than that of ordinary steel bars. There are two main types of carbon fiber materials used in the reinforcement and repair of concrete structures: carbon fiber materials and supporting resins.

Among them, the tensile strength of carbon fiber is ten times that of construction steel, and the elastic modulus is equivalent to that of steel, and the elastic modulus of some types (such as high elasticity) of carbon fiber is even more than twice that of steel, and the construction performance and durability are good, which is a good reinforcement and repair material; The supporting tree finger includes the underlying resin, leveling resin and bonding resin, the first two are used to improve the bonding quality of carbon fiber, and the latter function is to make carbon fiber and concrete can form a composite whole, and work together to improve the bending and shear bearing capacity of structural components, so as to achieve the purpose of reinforcing and reinforcing structural components.

The main mechanical index of carbon fiber cloth.

Tensile strength (mpa) elastic mold (mpa).

Elongation (%)

Technical Specification Indicator 3000

Design of matching resin binder material.

The supporting resin is formulated by the main agent and the curing agent, and is divided into winter type and summer type suitable for winter and summer use. The main agent and the curing agent are packaged separately, and when used on site, they should be mixed evenly according to the process requirements and in accordance with the specified ratio to form the required bottom resin, leveling resin and adhesive resin.

Bottom resin The role of bottom resin is to enhance the interface bond strength between surface concrete and leveling material or adhesive resin;

Leveling resin Leveling resin is to make the surface flatness meet the specified requirements, and has reliable bonding strength with the underlying resin and adhesive impregnating resin;

Adhesive resin Adhesive resin is the main adhesive material for pasting carbon fiber cloth, and its function is to make carbon fiber cloth and concrete fully bonded, so that they can bear the role of structure together.

The main mechanical properties of supporting resin binder materials:

Positive tensile bond strength (MPa).

Shear strength mpa).

Tensile strength (mpa).

Flexural Strength (MPa).

Bottom resin leveling resin.

Technical Specification Indicators.

and greater than times the tensile strength of concrete.

Adhesive resin technical specification indicators.

Same as the underlying resin.

Construction preparation 1), main materials: primer, adhesive, carbon fiber cloth.

I'll take a look at what the two upstairs have to say

The key depends on where your frame beam is, if you don't pay much attention, it's still the second one, the first one says that the cost is too high, carbon fiber composites are generally used to repair the theme beam, and the one used to reinforce is expensive, as long as the original beam does not have cracks. It is not necessary to use those for the sagging case.

There are three ways to reinforce, one is to increase the cross-section, the second is to reduce the beam span, and the third is to weld the angle steel skeleton around the frame beam.

Frame beam (kl) refers to a beam connected to a frame column (kz) at both ends, or a beam connected to a shear wall at both ends but with a span-to-height ratio of not less than 5. Now in structural design, there is another point of view for frame beams, that is, beams that need to participate in seismic resistance. Pure frame structures are becoming less and less common with the rise of high-rise buildings, and the frame beams in shear wall structures are mainly beams that participate in seismic resistance.

Well, that's pretty much it

1. Increase the beam section reinforcement method

The reinforcement method of increasing the beam section is a traditional beam reinforcement method that increases the cross-section of the beam by increasing the stressed steel bar of the original beam and pouring new concrete on the outside at the same time.

The advantages of this method are mainly to increase the strength, stiffness and stability of the beam, which is obvious and guaranteed. At the same time, it can be flexibly designed as one-sided, double-sided or three-bread sleeve according to the stress characteristics and reinforcement purpose, which provides a flexible treatment method for some beams that are difficult to construct in some positions.

2. Beam paste fiber composite material reinforcement technology:

The reinforcement technology of beam paste fiber composite material is to use carbon fiber cloth and special structural glue to reinforce the raw sorghum. Carbon fiber cloth reinforcement technology is now also more and more widely used in beam structure reinforcement.

3. Beam paste steel plate reinforcement method:

The beam pasting steel plate reinforcement method is to use a special structural adhesive to paste the steel plate on the round surface of the reinforced concrete beam, which can achieve the purpose of strengthening and enhancing the strength and stiffness of the original beam. The main advantages of its reinforcement are:

1. Strong and durable, it has been proved that the quality of the reinforcement project can be fully guaranteed, and the strength and stiffness of the beam can meet the requirements of the design.

2. The construction is fast, and the construction task can be completed quickly under the premise of ensuring the quality of the bonded steel reinforced beam.

In the process of construction, we found that the frame beam is also to be reinforced, many of the family exists, in order to make him stronger, some people will reinforce him, in fact, for some experienced people, he does not know how to reinforce, frame beam reinforcement construction steps? What is the difference between a ground beam and a frame beam? In the process of construction, we found that the frame beam is also to be reinforced, many of the family exists, in order to make him stronger, some people will reinforce him, in fact, for some experienced people, Tease Na Oak for his reinforcement does not know how to build, what problems need to be paid attention to in the process of construction, this is what people are more concerned about to tell you the frame beam reinforcement construction steps?

What is the difference between a ground beam and a frame beam?

Frame beam reinforcement construction steps

The frame beam was reinforced with structural adhesive steel plate shear hoops, and cement slurry was plastered on the surface of the steel plate. For the beam body whose stirrups at the end of the main beam do not meet the requirements of the specification, U-shaped carbon fiber cloth can be pasted at the end of the beam to improve the shear resistance. The non-structural vertical cracks were treated with structural adhesive pouring and pressure sealing.

Carry out rust prevention treatment of steel bars, penetrate and strengthen the long ribs, implant U-shaped stirrups, install shear steel brackets and fix them with tension bolts.

What is the difference between a ground beam and a frame beam?

1, the ground beam is actually a kind of foundation beam, generally used in the structure of frame structure, frame shear wall, frame column will fall on the foundation beam or the intersection of the foundation beam, the main role is to be used as the foundation of the upper part of the building, the upper load is transferred to the foundation, is a kind of load-bearing and bending function, the sensitive core section of the general ground beam will be relatively large, the stiffness of this beam is also very large, can play the effect of the foundation beam. The frame beam refers to the beam that is arranged on the top surface of the foundation and will be lower than the building elevation plus or minus 0 000, and also takes the frame column as the side seat of the supporting mountain.

2. The main function of the ground beam is to adjust the uneven settlement that may occur, strengthen the integrity of the foundation, make the foundation reaction force more uniform, and also have the effect of ring beam and waterproof and moisture-proof, the ground beam is generally used in the structure of brick concrete and masonry, which has a restraining effect on the masonry, which is very conducive to earthquake resistance. And the anti-lateral movement ability of the frame beam structure will be lower than that of the shear wall structure, and the height of the more suitable construction is lower than that of the ground beam structure, and the frame structure is rarely adopted in the general high-rise building.

What are the steps I have introduced to the frame beam reinforcement construction? What is the difference between a ground beam and a frame beam? We have some understanding of the problem of reinforcement, although many people don't know much about the details, you have read what I introduced, you must pay attention to these, because these can easily cause problems for us, and even affect his effect.

Therefore, in the process of construction, any detail cannot be ignored.

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We're glad to answer your questions! Building technology: base treatment unloading, reinforcement components in place, caulking, filling, fastening, pressure, surface protection building construction essentials:

1. Surface treatment of the steel plate, rust removal of the rusted steel plate, and then polishing with a special flat grinding wheel to make it perpendicular to the stress direction of the steel plate to produce a metallic luster, after polishing, wipe the steel plate with alcohol or acetone. Soft 2, the surface treatment of concrete: in the surface treatment of concrete, first chisel the paint layer to the structural layer, and then chisel the concrete, if there is a wall under the beam, then the wall of 40 is chiseled, and the dust particles inside are blown dry with compressed air, if there is loose non-dense concrete, it needs to be chiseled off until the hard concrete (Note:

The concrete strength of the house adhesive steel reinforced base should not be less than C15). Where there are defects on the surface of the old concrete, first repair it with epoxy resin, after curing, polish it flat, and then proceed to the next step of construction. 3. Adhesive:

JGN structural adhesive is composed of two components, A and B, with a ratio of 3:1, and a test report was issued. When dispensing drugs in groups A and B, clean tools should be used, accurate measurements, and a special person should be responsible.

After mixing groups A and B, they should be mixed in the same direction. 4. After the structural adhesive is made, it should be evenly coated on the surface of the concrete and steel plate with a scraper, with a thickness of 1 to 3 mm, and a thick edge in the middle, and then paste it into the pre-expansion data 5. After the steel plate is pasted, a special tool or expansion screw should be used immediately, and the viscose should be squeezed out from the edge of the steel plate under a certain pressure. 6. JGN type structural adhesive, cured at room temperature, can be more than 20, can be dismantled within 24 hours, and can withstand pressure for 3 days.

7. After the reinforcement is completed, the modified epoxy resin is used for anti-corrosion treatment and sprinkled with silica sand to facilitate the painting of mortar. 8. When preparing structural adhesives, the following safety regulations must be followed: when preparing structural adhesives, it is necessary to pay attention to the sealing of raw materials to prevent direct sunlight.

In the place of production and use, ventilation should be ensured. Workers are required to wear uniforms and protective equipment. 9. Engineering quality inspection

Disassemble the temporary fixing bracket and hit the steel plate with a small hammer to judge the effect of gluing by sound. The joint surface of the anchor area and the non-anchor area shall not be less than 90%, if the above requirements are not met, it needs to be peeled off and bonded, I hope mine can help you! <>

Reinforcement and increase of beams refers to the increase in the number and size of connecting beams in the structure of the building, in order to make it more firm and stable, so as to improve the overall seismic resistance and load-bearing capacity. It is mainly aimed at the situation that there are certain loopholes in the design of old buildings or new houses, which cannot meet the requirements of safety formwork, and make up for the structural deficiencies by increasing the number and size of beams. The operation of reinforcing the additional beam needs to go through detailed structural evaluation and design plan formulation to ensure that the overall structure of the reinforced building meets the requirements of safety and stability, so as to ensure the safety of people's lives and property.

Many methods, such as steel reinforcement, carbon fiber reinforcement, steel beam reinforcement, height reinforcement, intermediate support reinforcement, etc.