Prevention of foundation settlement of steel structure building

How to avoid the settlement of steel structure building foundation, we must first start from the foundation platform. When the steel structure house reaches more than 25 kilograms per square meter, the basic platform should reach 1 kilogram high, 1 meter wide, 1 meter deep, and the steel structure house foundation will settle more than 35 kilograms per square meter. Depending on the situation of the site itself, it is necessary to make a ring beam and 1.2 meters of foundation.

After the construction of steel structure houses is completed, there is no good early investment. How to prevent the sinking of the steel structure building foundation is simply to strengthen, and all steel structures are made of I-beams or channel steel. The invention can prevent the settlement of steel structure building foundation.

In recent years, steel structure houses have been widely used in coal engineering because of their light weight, good seismic performance, flexible structure layout and fast processing and installation speed. In this paper, we only discuss one layer plant, namely door rigid frame light steel structure and steel row structure, in which door rigid frame light steel structure is a common structural form. For steel structure houses with large lifting tonnage, its foundation brings some difficulties to the foundation design, because its weight is too light, the axial force of the column bottom is small, the bending moment is large, and the eccentric distance is large.

1. Foundation bearing characteristics of steel structure plant.

Steel foundation generally adopts single-layer foundation, biased design.

The steel structure of the rigid frame of the door is not high, there is no crane, and the connection between the column foot and the foundation is generally hinged. The top surface of the foundation is only affected by the vertical pressure of the superstructure and the horizontal force of the wind load. The eccentric bending moment of the foundation bottom surface is small, and the foundation design is relatively simple.

In order to effectively improve the anti-lateral stiffness of the structure and control the lateral displacement, steel structure houses with large horizontal stiffness (single 20t crane or double 20t crane) are generally used for lateral rigid connection and longitudinal articulation. The factory is a treat.

The horizontal load is transferred to the top surface of the foundation through the intercolumn supports. However, in the horizontal direction, due to the light weight of the steel structure, long natural vibration period, the horizontal earthquake effect is relatively small, and the control horizontal load is generally the air form of the horizontal brake load of the crane, so the axial force of the two rods is not equal. The formula is based on elastic stability theory,

It is suitable for two diagonal rods of the same length and the same length.

(1) The other bar of the intersection is pressed, the two bars are concentric, and there is no break at the intersection:

In the formula.

Second, the other rod of the cross-joint is under pressure, and the rod is interrupted at the cross-joint, but is overlapped by the joint plate.

Third, the other bar of the intersection is pulled, the two bars are concentric, and the intersection is not interrupted:

The other bar of the cross-tension is broken at the intersection point, but is overlapped on the node plate