Several common methods of foundation reinforcement

Common methods for foundation reinforcement:

(1) Foundation reinforcement grouting reinforcement method. Drill holes at the damaged foundation. The diameter of the hole should be larger than the diameter of the grouting pipe. The general specification is 27 to 28 mm. The grouting material can be cement slurry.

(2) Deepen the foundation method. The reinforcement method is applicable to the condition that the shallow layer of the foundation is of good quality and can be used as the load-bearing layer and the underwater position is lower. By deepening the depth of the original foundation and pressing it on the better soil, the requirements for the bearing capacity of the foundation can be met. If the groundwater level below the foundation is higher, appropriate drainage measures need to be taken.

(3) The method of increasing the bottom area of the foundation. This reinforcement method is applicable to the case that the bearing capacity of the foundation and the area of the foundation bottom do not meet the design requirements.

Design principles in building reinforcement

1. The reinforcement scheme shall be determined according to the appraisal results of the seismic capacity and after comprehensive analysis. The overall reinforcement, section reinforcement or component reinforcement shall be adopted respectively to strengthen the integrity, improve the stress condition of the components and improve the comprehensive seismic capacity.

2. The arrangement of reinforcement or new members shall eliminate or reduce adverse factors to prevent local reinforcement from causing sudden changes in the stiffness or strength of the building structure.

3. There should be a reliable connection between the new component and the original component; The newly added seismic walls, columns and other vertical components should have reliable foundations.

4. When the type of materials used for reinforcement is the same as that of the original structure, the strength grade shall not be lower than the actual strength grade of the original structural materials.

5. For parapets, door faces, chimneys out of the roof, etc. that do not meet the identification requirements, components of non building structures that are easy to collapse and hurt people shall be removed or the height shall be reduced. If the original height needs to be maintained, the building shall be reinforced.