It is inevitable that various problems will occur in the use of steel structure buildings, especially when they are used to a certain extent and for a certain period of time, some quality problems will inevitably occur. So what should be done to strengthen the steel structure factory?
Before the reinforcement design of steel structure factory, the reliability appraisal shall be carried out according to the reliability appraisal standards of industrial plant and civil buildings, and the content and scope of reinforcement design shall be determined according to the appraisal results. At the same time, according to the severity of the structural damage consequences and the requirements of the user, determine the safety level of the strengthened building structure.
The original structures and components shall be retained and used as much as possible to avoid unnecessary removal and replacement. The retained parts shall be safe and durable. Recycling and reuse of materials shall be considered for the demolition part. In consideration of the comprehensive technical and economic indicators, measures shall be taken from the design and construction organization to minimize the construction period, reduce the shutdown and stop production, and do not affect the use of buildings as much as possible.
The steel structure factory is damaged due to high temperature corrosion, freeze-thaw vibration, uneven settlement of foundation and other reasons. The reinforcement must also consider eliminating, reducing or offsetting these adverse factors to avoid further deterioration and secondary reinforcement.
Then the reinforcement methods of steel structure factory also include the following categories:
1. Reinforcement method with enlarged section
This method has simple construction technology, strong adaptability and mature design and construction experience. It is applicable to concrete reinforcement of beams, slabs, columns, walls and general structures. However, the wet operation time of on-site construction is long, which has a certain impact on production and life, and the building clearance after reinforcement has been reduced to a certain extent.
2. Replacement concrete reinforcement method
The advantages of this method are similar to those of the enlarged section method, and the clearance of the building will not be affected after reinforcement, but there is also the disadvantage of long wet operation time. It is applicable to the reinforcement of concrete bearing members such as beams and columns with low concrete strength or serious defects in the compression zone.
3. Strengthening method with bonded and wrapped section steel
This method, also known as wet wrapped steel reinforcement method, is characterized by controllable stress, simple construction, small on-site workload, but large steel consumption, and should not be used in high temperature places above 600 ℃ without protection. It is applicable to the reinforcement of concrete structures that are not allowed to significantly increase the section size of the original members in use, but require to greatly improve their bearing capacity.
4. Reinforcement by pasting steel plate
This method is characterized by fast construction, no wet operation on site or only a few wet operations such as plastering, which has little impact on production and life, and has no significant impact on the appearance of the original structure and the original clearance after reinforcement, but the reinforcement effect depends to a large extent on the adhesive technology and operation level. It is applicable to the reinforcement of flexural or tensile members under static force and in normal humidity environment.
5. Strengthening method by pasting fiber reinforced plastics
In addition to the similar advantages of sticking steel plates, it also has the advantages of corrosion resistance, moisture resistance, almost no increase in the dead weight of the structure, durability, low maintenance costs, etc. However, special fire prevention treatment is required, which is applicable to concrete structural members and general structures with various stress properties.
6. Winding method
The advantages and disadvantages of this method are similar to those of the enlarged section method. It is applicable to the reinforcement of concrete structural members with insufficient diagonal section bearing capacity, or the occasion where lateral restraint force is required on compression members.
7. Anchor bolt anchoring method
This method is applicable to the reconstruction and reinforcement of concrete bearing structures with concrete strength grade of C20~C60. It is not applicable to the above structures and light structures that have been seriously weathered.
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