RU94038067A - Multibore chimney stack - Google Patents

Abstract

FIELD: chimney stacks. SUBSTANCE: multibore chimney stack is made in form of self-bearing cast-in-situ reinforced concrete structure whose body accommodates four gas escape bores 1, elevator shaft 2, open channels 3 for load lifting operations, conical semicircles 4 of external walls of gas escape bores 1 made in form of truncated semicones, block-panels 5 prefabricated from acid-heat-resistant material which are installed over internal perimeter of gas escape bores, elevator shaft 2. Before concreting the chimney stack, each block- panel installed into design position is secured with special anchors to metal reinforcing cage of bores. Vertical seams between panels are filled with acid-resistant mortar through special expanded grooves (Author's Certificate 910992). After installation of block panels of the first belt of gas escape bores and elevator shaft, chimney stack is concreted as a whole. In this case, rear wall of block-panels is concreted over the entire surface of high reinforced concrete bores of chimney stack. In so doing, high quality of protective lining wall is attained that excludes full failure of chimney stack in service and its service life reaches 100 years and above without major repair of lining. Labor input is reduced, both, during construction and maintenance of the chimney stack which is operated without employment of attending personnel inside the chimney stack. The offered structure of chimney stack has high economic efficiency and great advantage over the analogs and prototype EGG borough (England). New design of chimney stack fully excludes from the construction the bearing reinforced concrete column of the chimney stack (shell) that results in saving of 1622 cu. m of cast-in- situ reinforced concrete, 2000 t of high-grade steel 20XMNDP8, 902 t of common grade steel. Chimney stack estimate is reduced by 1773 thou, roubles, as have been shown by the preliminarily calculation (prices of 1980). EFFECT: higher operate reliability, reduced metal content and construction terms. 3 cl, 5 dwg

Claims (1)

The proposed multi-barrel chimney is made in the form of a self-supporting monolithic reinforced concrete structure, in the body of which there are four gas outlet shafts 1, an elevator shaft 2, open channels 3 for lifting operations, conical semicircles of the outer walls of the gas outlet shafts 1, made in the form of truncated semi-cones, block panels 5 made of acid-heat-resistant material in the factory, which are installed along the inner perimeter of the gas outlet shafts 1, elevator shafts 2. Before each concrete pipe begins Lock panel, installed in the design position, attaches special anchors to the metal frame of trunks. The vertical joints between the panels are filled with an acid-resistant solution through special widened grooves. After installing the block panels of the first belt of the exhaust pipes and the elevator shaft, they begin concreting the pipe as a whole, while the back wall of the block panels is monolithic over the entire surface of high reinforced concrete shafts, thereby ensuring the integrity and indivisibility of all structural elements of the pipe, while achieving high quality protective lining wall, which eliminates the complete failure of the pipe in operation and increases the life of up to 100 years or more without major repairs of the lining. The complexity of the work both during construction and during operation of the pipe, which works without maintenance personnel inside the pipe, is sharply reduced. The new design of the pipe completely excludes the reinforced concrete pipe trunk (shell) from construction, thereby saving: monolithic reinforced concrete, high-quality steel grade 20KHMNDP8, ordinary steel grade 3.5. The estimated cost of the pipe is reduced by 1 million.773 thousand rubles. The above calculations confirm that a multi-barrel chimney increases its reliability in operation, reduces metal consumption and shortens the time of construction work.