Henan Hengji Housing Quality Inspection & Testing Co., Ltd., services include: housing inspections, school housing inspections, kindergarten housing inspections, community housing inspections, etc. The company is fully equipped with qualifications and equipment, capable of conducting inspections and testing on various housing quality and issuing valid certificates. It has obtained the CMA inspection and testing system certification!

Common safety issues in house structures

Crack

There are many reasons for cracking and water leakage in the reinforced concrete structure of a house, which can be roughly divided into temperature cracks, load cracks, and shrinkage cracks.

1) Temperature cracks

Temperature cracks typically arise from significant temperature variations or the hydration heat generated during concrete construction. Research indicates that once the temperature difference between the interior and exterior of the concrete exceeds 10°, the shrinkage rate is 0.01%. The Nanyang Building Quality Inspection Report notes that when the temperature difference is between 20° to 30°, the shrinkage rate increases to 0.02% to 0.03%. The maximum shrinkage a concrete structure can withstand is 0.01% to 0.02%, which can lead to temperature cracks in the concrete. Therefore, during the safety evaluation of a building, it is crucial to consider the impact of external factors on the building structure, thoroughly review construction documents, and consult the Nanyang Building Quality Inspection Agency to determine the cause of the cracks.

2) Load Cracks

The causes of load cracks are generally due to improper structural design, incorrect construction methods, insufficient concrete bearing capacity, and uneven settlement of the foundation. The occurrence of load cracks can lead to deformation of the entire project and affect the structural stability. Therefore, during the safety assessment of entering the building, it is essential to thoroughly review relevant geological and construction documents, reasonably calculate the bearing capacity of the building structure, and thus issue a scientific assessment report.

3) Drying cracks

Dry shrinkage cracks are caused by material issues. As concrete structures set, they reduce in volume, causing the pores within the concrete to shrink. When the dry shrinkage value exceeds the concrete's ability to withstand significant tensile stress, dry shrinkage cracks occur. Therefore, during the safety assessment of the building, strict inspections of cement materials, aggregates, water-cement ratio, and other indicators are required to accurately determine whether the construction materials meet the building requirements.

Henan Hengji Building Quality Inspection & Testing Co., Ltd., services include building inspections, school building inspections, kindergarten building inspections, community building inspections, etc. The company is fully equipped with qualifications and equipment, capable of conducting inspections and testing on various building qualities and issuing valid certificates. Nanyang Building Quality Inspection & Testing Prices, certified by the CMA Inspection & Testing System!

Many people who haven't conducted building inspections are unaware of how building safety assessments are categorized, or the number of grades they are divided into. The "Standard for Identification of Dangerous Buildings" specifies that dangerous buildings are those with severely damaged main structures, or critical components that are now dangerous, posing a risk of losing stability and load-bearing capacity at any time, and cannot ensure the safety of occupancy and use. Below, let's get to know more about this:

Hazardous Dwelling and Dwelling Condition Inspection

When referring to standards, the "Standard for Hazardous House Inspection" (JGJ125-99) is commonly applicable to houses with a certain system but unreasonable materials, such as old brick-and-wood structures; the "Standard for Assessment of House Condition and Damage Level" is often used for irregular, non-systematic non-standard houses. Therefore, when inspecting, it is reasonable to choose the standard basis and inspection methods based on the actual on-site conditions.

Home Safety Inspection

This type commonly occurs in civil disputes, requiring the parties to entrust the matter. Both parties must cooperate in the testing process, especially for on-site inspections, which must be agreed upon by mutual consent before proceeding. Quality inspection of construction work should be conducted during on-site testing. The test results should be mutually acknowledged by both parties.

Henan Hengji Housing Quality Inspection & Testing Co., Ltd., services include: housing inspections, school housing inspections, kindergarten housing inspections, community housing inspections, etc. The company is fully equipped with qualifications and equipment, capable of conducting inspections and testing on various housing quality, and issuing valid certificates. It has obtained the CMA Inspection and Testing System Certification!

In the following situations, social flag house quality inspections should be conducted for comprehensive structural safety assessment of Henan housing.

1. To be continued in use upon reaching the designed service life.

2 Original design does not consider seismic fortification or an increased requirement for seismic fortification.

3. To be reconstructed, affecting the structural safety and seismic performance; altering the use purpose, increasing the dead load, or raising the seismic fortification category; or reducing the structural safety and seismic performance of the building's main body and load-bearing structure without following the regulations.

4. Subject structure shows obvious cracks under load, or damage such as rust and deformation of steel bars or steel beams.

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