Building keel

The invention provides a building keel. The building keel comprises an n-shaped galvanized steel sheets, square pillars and bolts, wherein the hollow portions of the n-shaped galvanized steel sheets are filled with the square pillars, and the bolts are used for fixing the n-shaped galvanized steel sheets and the square pillars. Flangings are arranged on the two sides of openings of the n-shaped galvanized steel sheets, bolt holes for mounting of the square pillars are further formed in the two side edges of the n-shaped galvanized steel sheets, and the n-shaped galvanized steel sheets and thesquare pillars are connected through the bolts. Water storing grooves are formed in the flangings of the n-shaped galvanized steel sheets. The adopted steel wood keel is large in section inertia, highin stress performance, moderate in price and capable of improving corrosion resistance and stability and can be widely applied; the steel-wood-integrally-combined n-shaped steel-wood keel can bring the material characteristic into play to the utmost extent and increase the strength-weight ratio; and nailing is facilitated in formwork erecting through the inlaid square pillars, meanwhile the inlaid square pillars are effectively protected through the peripheral bent n-shaped beam steel sheets, the loss of the square pillars is greatly reduced, the project cost is reduced, and environment protection is achieved.