foundation subsidence reinforcement project are caused by various factors, which can be divided into the following categories: temperature change, foundation settlement, decoration material problems, insufficient bearing capacity of brick masonry, unbalanced structural stress and other comprehensive factors.
At present, many houses will have cracks of different widths after living for a period of time, but not a crack will affect the personal safety of residents, some cracks will not affect the structural safety of the house, and appropriate repair measures can avoid cracks continuing to widen.
I. Classification of foundation subsidence reinforcement projects
According to the causes of cracks, it can be divided into load cracks, settlement cracks, temperature cracks, shrinkage cracks and so on.
Cracks are divided into two categories according to whether they are load-related and whether they affect safety:
1, structural cracks: including load cracks, settlement cracks, the generation of such cracks is mainly related to the load, if not timely use of appropriate measures will affect the structural safety of the house.
2, non-structural cracks: including temperature cracks, shrinkage cracks, such cracks are not caused by structural load, the generation of cracks does not affect the safety of the structure. Non-structural cracks account for more than 80% of house cracks.
Ii. Reasons for foundation subsidence reinforcement project
1. Causes of structural cracks:
(1) Uneven settlement of foundation
(2) Design reasons: calculation errors, structure does not meet the requirements of national norms
(3) Construction reasons: insufficient concrete strength, insufficient reinforcement or low support reinforcement, insufficient bearing capacity of brick masonry, unqualified decoration materials, insufficient section size, etc.;
(4) Reasons for use: change the nature of the use of the house, overload use, unreasonable demolition and modification of the structure, unbalanced structural stress, etc.
2. Causes of non-structural cracks:
(1) Wall settlement cracks: caused by uneven settlement of the foundation. Generally distributed in the lower part of the building, gradually decreasing from the bottom to the top;
(2) Temperature cracks: shrinkage and expansion of reinforced concrete structures due to the influence of atmospheric and ambient temperature changes.
(3) Shrinkage cracks: in the hardening process of concrete, shrinkage deformation will occur, and the resulting cracks are called shrinkage cracks (also known as dry shrinkage cracks).
The production and quantity of shrinkage cracks are related to material properties, design factors and construction techniques. Maintenance, climate temperature difference, house size, expansion joint spacing and so on.
The width of temperature cracks is often reversible, while shrinkage cracks are not.
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