Modern building reinforcement technology?

What does modern building reinforcement technology specifically include? The following Zhong Da consults the bidding teacher to answer your questions for your reference.

The general methods of direct reinforcement are:

1, strengthening method with enlarged section

This method has simple construction technology, strong adaptability and mature design and construction experience. Suitable for concrete reinforcement of beams, slabs, columns, walls and general structures; However, the long wet operation time in site construction has a certain impact on production and life, and the clearance of reinforced building has been reduced.

2, replacement concrete reinforcement method

The advantage of this method is similar to the method of enlarging section, which does not affect the clearance after strengthening the building, but it also has the disadvantage of long wet working time. It is suitable for the reinforcement of concrete bearing members such as beams and columns with low concrete strength or serious defects in compression areas.

3. Bonding and outsourcing reinforcement method

This method is also called wet steel-clad reinforcement method, which has the advantages of reliable stress, simple construction and less on-site workload, but it uses a lot of steel and is not suitable for unprotected high temperature places above 600C C. It is suitable for the reinforcement of concrete structures that are not allowed to greatly increase the section size of the original members, but require to greatly improve their bearing capacity.

4, paste steel plate reinforcement method

The advantage of this method is that the construction speed is fast, and there is no need for wet work on site or only a small amount of plastering, which has little impact on production and life. After reinforcement, there is no obvious impact on the appearance and original clearance of the original structure, but the reinforcement effect depends largely on the gluing technology and operation level. It is suitable for the reinforcement of flexural or tensile members under static action and normal humidity environment.

5, paste fiber reinforced plastic reinforcement method

In addition to the advantages similar to sticking steel plates, it also has the advantages of corrosion resistance, moisture resistance, almost no increase in structural weight, durability and low maintenance cost. However, it needs special fire protection treatment and is suitable for concrete structural members and general structures with various mechanical properties.

6, winding method

The advantages and disadvantages of this method are similar to those of the enlarged section method. It is suitable for the reinforcement of concrete structural members with insufficient bearing capacity of inclined section, or the occasion where transverse binding force is needed to be applied to compressed members.

7, anchor bolt anchorage method

This method is suitable for the reconstruction and reinforcement of concrete load-bearing structures with concrete strength grade of C20~C60. It is not applicable to the above-mentioned severely weathered structures and lightweight structures.

The general methods of indirect reinforcement are:

1, prestressed reinforcement method

This method can reduce the stress level of the strengthened members, not only make the strengthening effect good, but also greatly improve the overall bearing capacity of the structure, but it will have a certain impact on the appearance of the original structure after strengthening. It is suitable for the reinforcement of long-span or heavy-load structures and concrete members under high stress and strain conditions, but it cannot be used in unprotected environments above 600C, nor is it suitable for structures with large shrinkage and creep of concrete.

2, increase the bearing reinforcement method

This method is simple and reliable, but it is easy to destroy the original appearance and use function of the building and may reduce the use space; It is suitable for the reinforcement of concrete structures permitted by specific conditions.

Generally, the technologies supporting the reinforcement and reconstruction of concrete structures are:

1, underpinning technology

Tie joists (or trusses, the same below), dismantle columns (or walls, the same below), connect columns with joists, and replace columns with joists; It is a comprehensive technology, which consists of related structural reinforcement, superstructure jacking and resetting, and abandoned components removal. Suitable for the reinforcement and reconstruction of existing buildings; Compared with the traditional method, it has the advantages of short construction time, low cost and little impact on life and production, but it has high technical requirements and needs skilled workers to ensure safety.

2. Reinforcement planting technology

This is a simple and effective connection and anchorage technology for concrete structures. Ordinary steel bars can be implanted, and bolt anchor bars can also be implanted; It has been widely used in the reinforcement and reconstruction of existing buildings, such as: the remedy of missing buried steel bars or steel bars deviating from the design position during construction, the reinforcement of reinforced members by increasing the cross section, the extension of superstructure to beams and columns by jacking method, the addition of columns layer by layer in houses, and the planting of steel bars in shear walls of high-rise buildings.

3, crack repair technology

According to the cause, nature and size of concrete cracks, different sealing methods are used to repair them, which is a special technology to restore the service function and durability of the structure reduced by cracks. It is suitable for the treatment of all kinds of cracks in existing buildings, but for mechanical cracks, besides repairing, corresponding reinforcement measures should be taken.

4. Repair technology of carbonized concrete (immature)

It refers to the technology to suppress the corrosion of steel bars caused by carbonization by restoring the alkalinity (passivation) of concrete or increasing its impedance.

5, concrete surface treatment technology

Refers to the use of chemical methods, mechanical methods, sandblasting methods, vacuum cleaning methods, water injection methods and other special technologies to clean up stains, oil stains, residues and other attachments on the concrete surface.

6, concrete surface sealing technology

It refers to the technology of waterproof, moisture-proof and crack-proof treatment of concrete by using flexible sealant filling, polymer grouting and film coating.

7. Other technologies

Such as structure, component displacement technology, adjusting the natural frequency of the structure, etc.

Strengthening method of masonry structure;

The reinforcement of masonry structure can be divided into direct reinforcement and indirect reinforcement. When designing, we can choose the appropriate method according to the actual situation and use requirements.

The direct reinforcement methods applicable to masonry structures usually include:

1, reinforced concrete additional layer reinforcement method

This method belongs to one of the combined section reinforcement methods. Its advantages are simple construction technology, strong adaptability, greatly improved bearing capacity after masonry reinforcement, and mature design and construction experience; Suitable for strengthening columns and walls with walls; Its disadvantage is that the wet operation time of site construction is long, which has a certain impact on production and life, and the clearance of reinforced building is reduced to a certain extent.

2, reinforced cement mortar layer reinforcement method

This method belongs to one of the combined section reinforcement methods. Its advantages are similar to those of reinforced concrete external reinforcement method, but its bearing capacity is not as good as the former. It is suitable for the reinforcement of masonry walls, and sometimes used to seal the stirrups on both sides of the wall when the reinforced concrete outer layer is strengthened with pilaster.

3, adding buttress reinforcement method

This method belongs to a kind of reinforcement method with enlarged section. Its advantages are similar to that of adding stories to reinforced concrete, but its bearing capacity is limited and it is difficult to meet the seismic requirements, so it is generally only used in non-seismic areas.

Indirect reinforcement methods applicable to masonry structures usually include:

1, unbonded reinforcement method

This method belongs to the traditional reinforcement method, and its advantages are simple construction, less on-site workload and wet work, and more reliable stress. It is suitable for the reinforcement of masonry columns that are not allowed to increase the section size of the original members, but require a substantial increase in the section bearing capacity; Its disadvantage is that the cost of reinforcement is high, and it is necessary to take protective measures similar to those of steel structures.

2, prestressed strut reinforcement method

This method can greatly improve the bearing capacity of masonry columns and the reinforcement effect is reliable; It is suitable for strengthening masonry structures with high stress and high strain. Its disadvantage is that it cannot be used in an environment with a temperature higher than 600℃.

Structural reinforcement and repair of masonry structure

1, reinforced by ring beam.

When the ring beam setting does not meet the requirements of the current design code, or there are obvious defects at the junction of vertical and horizontal walls, or the integrity of the house is poor, ring beams should be added for reinforcement.

2, add beam cushion reinforcement

When the brick masonry under the beam is partially crushed or local vertical cracks appear in the wall under the beam, cushion beams should be added for reinforcement.

3, masonry local demolition build by laying bricks or stones

When the house is partially broken, but the bearing capacity and safety are not affected after finding out the cause of the break, the broken wall can be removed and filled with whole bricks according to the level of improving the strength of mortar.

4, masonry crack repair

Before repairing cracks, the causes of cracks in masonry should be determined according to the stress state of masonry members and the characteristics of cracks, so as to repair cracks or take corresponding reinforcement measures.

Steel structure reinforcement method:

The main methods of steel structure reinforcement are: reducing the load, changing the structural calculation graph, increasing the section and connection strength of the original structural members, and preventing the crack from spreading. When there is mature experience, other reinforcement methods can also be adopted.

1, change the structure calculation graph.

The reinforcement method of changing the calculation graph of the structure refers to the method of strengthening the structure by changing the load distribution, force transmission mode, joint properties and boundary conditions, adding additional members and supports, applying prestress, and considering spatial synergy.

General reinforcement method of changing structural calculation graphics;

(1) The structure can be strengthened by the following methods to increase the rigidity of the structure or member:

A, adding supports to form a spatial structure and checking according to the spatial structure;

B, increase the support to increase the stiffness of the structure, or adjust the natural frequency of the structure. So as to improve the bearing capacity of the structure.

Good structural dynamic characteristics;

C, increasing supporting or auxiliary bars, reducing the slenderness ratio of the structure and improving the stability of the structure;

D, in the bent structure, focus on strengthening the stiffness of the column bearing most of the horizontal force, thus reducing its

Its column load;

E in towers and other structures, tie rods or moderately tensioned cables are arranged to strengthen the rigidity of the structure.

(2) The following methods can be used to strengthen flexural members by changing the internal force of the section:

A, change the distribution of load, such as converting a concentrated load into multiple concentrated loads;

B, change the end support, such as changing the hinge into a rigid knot;

C, adding an intermediate support or connecting the ends of the simply supported structure into a continuous structure;

D, adjusting the bearing position of the continuous structure;

E, changing the structure into a supporting structure;

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