Corbel supported brick

Figure 48-1 Corbel supported brick lined concrete chimney.

In this instance, brick was also used as a protective layer to shield the structural shell from the effects of heat. The flue itself was designed to stand alone against the forces of gravity and earthquake. An airspace was provided ranging from a few inches to a few feet, so that access could be provided to the exterior surface of the brick liner, a maintenance advantage not possible with the corbel supported brick lining. The structure itself was laid up in either acid resistant silicate or common Portland cement mortars, as previously described. It was basically unreinforced axially, but was corsetted with steel tension bands cir-... 

As stated earlier, acid resistant brick masonry (ARBM) has been a long standing workhorse in the industry. While the corbel supported brick liner has likely seen its last days with the passing of the hot, dry chimney, independent brick liners remain those most commonly specified today. 

The shell may be of metal (steel, alloy, or non-ferrous), plastic, wood or some combination which may require the addition of liners or inner layers of rubber, plastic or brick. The mechanical problems of attaching inner nozzles, supports and brick require considerable attention that is not an integral part of sizing the equipment. Figures 9-2A-C show a typical large steel brick-lined-membrane lined tower with corbeled brick support locations. In these towers, temperature and/or corrosive conditions usually dictate the internal lining, and the selection of the proper acid- (or alkali-) proof cements. 

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