1, one is the balance of gravity, that is, the upper load mainly by the mass base of gravity to balance, generally the concrete foundation. This basic form is suitable for use when the soil is soft and has open construction site.
2. The other is the pile foundation, in which the enlarged hole pile is the main type, which can be used in the case of limited construction site. In the identification of the Advertising screen Foundation must first look at its original drawings, construction materials, and then under conditions permitting the excavation of the foundation, to find out the basis of form, depth, size and other conditions and drawings to match, and the Advertising LED Screen Foundation concrete strength sampling inspection, in addition to the use of a balanced gravity-type advertising screen, we should pay special attention to the root of the steel column around the foundation of soil uplift, loosening, and under the action of wind load to form the foundation of the collapse of the soil surface, If there is an explanation that its foundation is not able to meet the requirements of overturning, at any time under the action of strong wind collapse risk, must be immediately strengthened treatment. Under normal circumstances, the use of Deep pile foundation advertising screen is less of this situation.
Second, the material of the column is tested and identified.
1. Check the quality of steel column and foundation connection.
The advertisement screen steel tube column and the foundation generally uses the bolt connection or the welding. Bolt connection, in the inspection must see if there is no missing bolt phenomenon, the bolt can not be deformed, sliding loose, such as damage; design drawings, bolts specifications, models to meet the design requirements; bolts should be done rust-proof treatment, such as serious corrosion should be replaced immediately, bolts fastening should be solid and reliable; for high-strength bolts, the exposed wire buckle should be $number buckle, allowing 10% of the bolts to be exposed to 1 or 4 buckles; the depth of the bolt should conform to the requirements of the specification.
2. Check the steel column.
First, we must measure the tilt of the advertisement screen steel column, the inclination of the steel column should not be greater than that of the 1000 H to be measured in two directions; Secondly, the quality inspection of steel tube column of advertisement screen, the appearance quality of steel can be divided into uniformity, whether there are interlayer, crack, non-metallic inclusions and obvious segregation and so on. When the quality of steel is doubtful, the specimen can be intercepted on the component, the mechanical property of the steel is inspected and the chemical composition is analyzed, but the safety of the structural component should be ensured. Finally, we should check whether there is corrosion phenomenon and quality of steel structure protective coating. The quality of the steel structure protective coating shall be tested according to the relevant product standards of the state.