The height dimension or relative position (±) of the steel column after installation is out of tolerance, so that the total height of each column and the height deviation value at the calf leg are inconsistent.
The reasons are:
The base elevation is incorrect or biased.
The length dimension of the steel column production stage is out of tolerance.
Or when the basic elevation is adjusted and processed during installation, it is not combined with the actual length (height) of the steel column, which will cause a positive or negative tolerance for the height or height of the steel column after installation.
Due to the ultra-difference, the components connected to it are difficult to install and adjust, and the correction is very difficult, time-consuming and labor-intensive.
(1) When the foundation is constructed, the elevation of the elevation should be strictly controlled to ensure the accuracy of the elevation. For the surface elevation of the foundation, the actual length of the steel column or the elevation of the horn support surface should be adjusted to make the height and elevation of the steel column consistent after installation.
(2) The steel column shall be strictly controlled in length during the manufacturing process (including the total length specified by the control design and the length dimension of each position, the length dimension within the allowable positive and negative deviation range, and the positive over difference allowed) The length of the non-contact steel column and the size of the ox leg are correct. The latter can be used to weld the column body first. The column base plate and the column head plate are not welded. If there is an out-of-tolerance, in front of the base plate of the welding column or the upper-end column plate Make adjustments and finally weld the column base plate and the head plate.