The protection appraisal of steel structure requires the appraiser to evaluate the construction of the steel structure, the overall construction, the completeness of the steel structure and whether the utilization condition of the steel structure endangers the safe use of the house. The concrete structure of the house is the foundation structure of the house. When the appraiser is appraised to the concrete structure of the building, he should appraise concretely according to the scope of concrete use.

The safety testing of steel tunneling structure is a new industry in our country. The main task is to check the safety of steel structure in good condition, the damage degree and the use condition.

1, steel structure safety identification.

The tested steel structures are mainly those built after 1950s, which belong to the conventional safety appraisal and is also a common type of steel structure safety. The complexity of identification depends on the actual situation of the site, and such steel structures are often affected by factors such as the use environment.

2, the normal use of steel structure identification.

The identification of this type of steel structure mainly considers whether it affects the normal use of users, such as decoration damage, water leakage, empty bag, etc. Be sure to check the operation to pay more attention to the design, corresponding to the actual environment. This kind of steel structure appraisal shall be carried out for making up or changing the service performance of steel structure for interest.

3. Safety appraisal of steel structure transformation projects.

This type of steel structure is mainly used for the internal integral structure modification or to connect the load generated by the new house. Inspection should highlight the inspection and calculation, check whether there is a problem with the steel structure distinction before manufacturing, whether there is a problem with the standard.

Housing structure safety appraisal refers to appraisal personnel appraisal of steel structure concrete structure. Whether the integrity and use of masonry structures and steel structures endangers safe use. Concrete house is the basic structure of steel structure. When inspecting the construction of steel structure cement, we should know the method of concrete utilization and identify it accordingly. In residential buildings, concrete structures are found everywhere, with steel foundations. Concrete materials are found throughout the steel walls and roof structures.

The practical work of steel frame concrete construction inspection should be carried out in the following ways:

1. Conduct field mapping of structure and frame elevation drawings. Draw elevations of the plan and frame of the steel structure.

2, the proportion of concrete structure composition identification. Generally speaking, the ratio of reinforcement and concrete in the walls of buildings should be 1:2 or 1:2.5 to meet the requirements of residents on the strength and durability of the walls. According to this requirement, the appraiser has a reasonable basis for determining the proportion of concrete structure components.

3, determine the material of concrete column or beam. If the concrete construction appears to tilt and crack in the process of steel structure inspection, the steel structure can be called dangerous house. Fourth, the bearing capacity of concrete structure identification. In residential structure, concrete structure does not exist independently, but is combined with masonry and steel, and its existence mode can effectively control the service life of concrete structure. For the masonry structure appraisal of steel structure, the appraiser should evaluate the masonry structure from three aspects: seismic performance, anti-tendency and anti-wind resistance.