| 摘要 |
<p>A header or lintel for wall openings constructed as a one-piece beam which may have an arched undersurface and with stepped sides, the height and width of the steps being multiples of 125 mm so as to conform to a standard size of building brick. The height of the sides of the beam may also be multiples of the height occupied by a standard brick, and the beam may be reinforced internally with a reinforcing rod running adjacent to its external contour, and to which reinforcement a lifting loop protruding upwardly from the beam to facilitate transporting and mounting of the beam. The beam may be of ? of inverted T-shape cross-section to allow bricks to be placed on and built up on the beam and it may include a shoulder on its bottom side to serve as an abutment for a door or window frame.</p> |
