1927 086 Ordinance - Laserfiche WebLink

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days after pouring, but this clause is not intended to pxevent remoging the joists and lagging in less time provided the slabs are kept properly shored. Sec.148a TNSPECTION AND TESTS. lrlhen ar?y rein=oxced concrete is used in con- struction, the rnmer shall provided for the inspectioil,. of eement and inert.s, as required by the Inspector of Buildingsv Unless otherwise &uthorized in writing bar the Inspector of Buildings, the owner shall also provide a special inspector of the work who'shall be satigfactory at all times to the Inspector of ?3uildings, and who sliall be on the work continually during the mixing and the placing of concrete and steel and the x'emo4al of forms. Su.ch special inspector shall make daily written re- ports to the Inspector of Builclings on the progr.ess of the work. Before reinforced concrete work is started, the owner shall name in writing the special inspector and such inspector shall pass such exaraina$ion as may oe re- quired by the Inspector of Buildings to determine his competency. Before a building containing reinforced concrete floors is occu?S.BC?.' the floors shall-be tested by applyirg a lbad equal to two and one-half (?) times the figured live load to such parts as the Inspector of Buildings or deputies may se- lect. 'Fhe floor shall sustain this load for ai; least twenty-fotzr (24)hours, with- out cracking or evident signs of failure. Sec.149. CONCRETF BLOCK COliSTRUCTION. (a) Concrete building blocks may be used for building two stories or less in height when the same is of frarne or tile construction where such blocks have passed the test hereinafter specifiedo Concrete shall be composed of at least one (1) part Portland cement and not rnore than tnree ( 3). parts sand, and not to exceed five ( 5) parts crushed,rock or gravel. • - . The cement, sand-and a.ggregate shall comply with the requirements specified in-Section 87-89-143 for these materials. ln no case shall the walls or vrebs of ' the blocks be less in thickness than one-quarter (-?) of the height. The hollow space in any block shall not exceed thirty-five (35) per cent. _ ,. (b) The thickness of walls for any building when.concrete blocks are used, shall be the same as the thickness of a brick wall, exc_ept `vhere the allowable crusn- ing strength of such wall is egceeded; then the thickness imzst be increased. An eight inch block shall be considered one ll) brick,-uhick in vrall meauure- ments. Vaere the face of a building is of concrete building block, and the backing if of brick tne facing of concre-L-e blocks must be. rvell bonclea to the brick, with headers projecting four (4) inches into the brick woTk, every fourth course being a header course. All raalls where blocks sre used sha.ll be laid with Portland cement mortar. (c)-All con.crete blocks before being used in const.ruction,in buildings shall have obtain the age of at least four (4) weeks. Szch blocks shall develop a crush- ing strength of 'fiftieen hundred (1500) pounds per square inch at tvrenty-eight days. UVhere girders, beams or joists rest" on the walls so that the.end reaction ex- ceeds four thousand (4,000) pounds the blocks beloev such concentrated loads must be made solid a distance bd]:ow and to the side, as may b.e required by ?he Inspector of Buildings. _ Concrete sills and lintels spanning over fou r l4) feet six (6) inches shall be reinforced and the ends rest in solid bl-ocks or solid walls.