The method of installing steel columns with centre seating slurry plate saves work and time, and the construction accuracy can be controlled within 2mm, and the comprehensive benefit can be increased by more than 20%.Construction steps are as follows:

(1) according to the construction drawings of the steel column foundation construction (with the usual construction methods), the foundation above the bottom of the steel column than the installation of the elevation of 30 ~ 50mm, in order to be placed in the centre of the grouting pad,

(2) according to the column weight Q, bolt pre-tensioning force F, the foundation of the concrete compressive strength of P, the calculation of the minimum compressive area of Amin.

(3) with the thickness of 10, 12mm steel plate made of square or circular centre grouting pad, the area should not beSquare or circular centre seat slurry pad, the area of which should not be less than 2 times the minimum pressure-bearing area Amin.

(4) Seat the slurry on the completed foundation and place the centre seating mat.Construction needs to use a level ruler, level and other tools for accurate measurement, to ensure that the level of the centre mat, to ensure that the centre of the mat is consistent with the installation axis, to ensure that the elevation of the mat above the elevation of the bottom of the installation of steel columns consistent.

(5) When the concrete strength of the slurry layer reaches more than 75% of the design strength, the steel column will be lifted.The lifting of steel column can be carried out directly, only by adjusting the ground bolt can be levelled and squared.

(6) Carry out secondary grouting, using non-shrinkage concrete or micro-expansion concrete.Carry out secondary grouting.