1927 086 Ordinance - Laserfiche WebLink

Home Browse Search

without perraitting a period of ten (10) hours to elapse to provide for settlement of - shrinkage in columns.. - -- Before r6suming work the top of the colwnn shall be cleansed of foreign mat- ter and if the columns have become hard9 the top sh&ll be -wet ancL slushed with the cement grout above specified: 4Uh.en beams are designed as tee beams, the s1ab: siiall. be poured at the same time as the web. • •- Some mea.ns satisfact"oxy.to the Inspector of Buildings shall be used to hold the reinforcing steel in its proper-position by means of a spacing and clamping de- vice. "- The'longitudinal ;steel=,in beams and girders shall be.so disposed that there shall be athiclmess of concrete between the-separate pieces-of.steel of not less than one and one-half (12) times the maximum sectional dimensions of the steel. When,steel?is,used in the.compressive side of beams and girderss the rods shall be tied in accordance with requirements of vertical reinforced columns, rrith stirrups coriz2ecting with the.,tei3sion rods of the beams or girders. . Sec..146. FREEZING IIlFATFM. 4Vhen concrete is placed in freezing weather the materials-must be-heated and auch provi9ions made that the concrete-can be put in place without freezing. • - The use of frozen, luinpy sand or aggregate depe'nding on hot wrater used in migture to thaw-it out, will-not be-permitted. All reinforced concrete shall be kept at a temperature above;freezing for at,least.forty-eight hours after being put in place. gll forms under concrete placed in freezing weather shall remain until all evidences of frost are reinoved froin the concrete and the natural harden- -ing of the concrete has proceeded-to the point of safety. kll,such.U;ork after cen- tering is removed shall be givent the plysical test.prescribed.in Section-150. Sec.147. CENTERING,AND FORI+L?S. -All forms shall be built-iiz,a substantial nianner, plumb and true, with tight joints, so that no appreciable part of t he con- •crete mixture can escape,-and shall be so supported and braced.that they will car- ry all-the usual loads,vahich may come upon them raitn 6ringing or deflection. .An openirg shall be left at the bottom of all column forms for cleaning and adjusting:_,the steel. This.opening shall.not be closed until all is in readiness for pourin;?'the columns. .The forms shall be carefully c].eaned just before.concret- ing, and all chips, ice and other foreign matter removed. • Before reinoving the ahores .under.. any_ :Ueaw or girder the coluinns supporting . 1't ?sha11 be stripped so that-the colurnns may be examined.on ,all sides, Pouring , coltiunns in chases left in the masonry shall not. be_ allowed. - Provided ample shores are used to carry the fu11 weight of the floor, col- umn forms ma.y be removed in noi less than four,(4).days after pouring. ? - The time-which shall'elapse before removing the shores under beams and gir- ders varies with the design and dondition of the weather, but in no case shall they be removed in les:s than. three (3) weeks after. pouring,, p.rovided.that t he beams and girders carry their otvil -weight only., Where' beams and girders ca.rry con- stru.ction loads froin above, sufficient.shoring ,;shall be left. in place to carry these loads until the completion of the work. --The supports ilnder.floor slabs shall not, be removed in less tnan ten l1o)