Internal structural lintel is for supporting unit masonry above an opening in a wall

Abstract

An internal lintel where masonry units are mechanically attached to a suspension member 3 by means of an anchor 2. The suspension member is attached to a hidden support beam 6 by means of a continuous strut 5 and strut fastener 8. No part of the lintel is visible after construction of the wall is complete.

Description

BACKGROUND [0001] 1. Field of Invention [0002] This invention relates to building construction, specifically to a support for masonry units over a wall opening. [0003] 2. Discussion of Prior Art [0004] An opening in a masonry wall can be effected by forming a natural arch whereby gravity forces on the masonry are directed to the ends of the arch through compression of the masonry units and the mortar. A semi-circular arch is a very efficient shape for transferring the vertical forces to the ends of the opening. [0005] Gravity forces can be transferred to major structural elements of the building (e.g. beams and columns) using steel rods and shapes attached with mechanical or welded connections to the structural elements. The masonry units rest on a steel shelf that is attached to the steel rod or shape. A steel angle is a very common shelf for masonry that can be connected to beams, anchored to concrete floor slab, or merely rested on masonry jambs at each side of the opening. [0006...

AI Technical Summary

Problems solved by technology

A true arch is very simple and efficient but is limited in proportions.

The magnitude of the thrust can become prohibitively large, especially if the thrust is directed against a column or pier of limited width.

In this case much of the arch bears on and thrusts against a veneer of masonry whose plane is perpendicular to the thrust force and therefore cannot offer substantial resistance.

The problem with typical shelf lintels is exposure.

It is frequently undesirable to have steel elements exposed to view.

There is also the issue of protection from the elements and continued maintenance of that protection.

This can be a significant disadvantage during construction because a crane is required for a trade that normally would not need one.

Excessive weight can also exceed structural limits of bearing pressure on the masonry at the jambs of the opening, where this type of lintel is usually supported.

Finally, this method like others can be limiting for a designer.

Other internal lintels offer significant freedom for a design professional, but still have limitations.

This limits the bond pattern achievable with the lintel.

This also places a practical limit on the strength of the main element and a corresponding limit on the width of an opening.

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