Inspector's Handbook of Reinforced ConcreteEngineering news publishing Company, 1909 - 66 pages |
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Inspector's Handbook of Reinforced Concrete (Classic Reprint) Walter F. Ballinger No preview available - 2018 |
Common terms and phrases
area of steel batch beam forms beam or girder beams and girders bending moment blocks bolts bottom braced building cast cement mortar center of action cinder cleaned concrete beams concrete is poured construction contractor crete cubic foot day's deformed bars diagrams EMILE G employed FALSEWORK feet filled finished floor formula frame frequently happens grout hand mixing hook ends inspector joint lagging main bars material metal mixture mold monolithic necessary number of bars obtained panels permit piece placed plank Portland cement prevent proportions rectangular reglets reinforced concrete reinforcing bars reinforcing elements removing the forms roof sand satisfactory scrubbed secure shearing shearing stress shrinkage sides of beams slab reinforcement sleepers space stairs steel beams stirrups strength stringer strip sufficient surface T-beams terra cotta thickness tie-rods tile tongued and grooved top coat trussed rods unit stress usually vertical WALTER F water-proof water-tight weight wiring wood
Popular passages
Page 55 - A jd f s (3)i in which A is the total cross section of the steel in the belt = 11 x 0.11 = 1.215 sq. in., and the distance from the center of the steel to the center of compressive resistance of the concrete is assumed to be, jd = 0.9 x 5.75 when d = 5.75 is taken as the distance from the center of action of the steel to the top of the slab, Hence W = 4 A jd fs/L (4)i is the load required to cause the stress /
Page 51 - ... in the proportion of one part of cement, two parts of sand and four parts of stone or gravel, or in such proportion as to produce a maximum density.
Page 31 - ... or the proportions may be such that the resistance of the concrete to crushing shall not be less than 2,000 pounds per square inch after hardening for twenty-eight days...
Page 52 - ... apart, is found satisfactory. The proportions of cinder concrete specified vary considerably— average proportions are 1: 3 : 6. The sides of sleepers are usually beveled, but this does not prevent them from becoming loose if the wood shrinks. The best method of holding the sleepers in place is to drive 40d. nails in the sides of the sleepers at intervals of 3 ft. on alternate sides. These nails key with the concrete and prevent movement of the sleeper. There has been much dissatisfaction with...
Page 2 - ... box so as to make the task of removing the forms as a unit almost an impossibility; hence, if the design of the beams and girders shows these members with plumb sides, a slight deviation from the design would be necessary with this type of forms. The side of the forms should project down past the edges of the bottom of the beam and girder forms, to permit the bottom plank to remain in place while the boxes are being removed.
Page 62 - AND THE CIRCUMFERENCE OF ROUND BARS. Steel weighing 490 pounds per cubic foot Thickness or Diameter in Inches. Weight of Square Bar 1 ft. long. Weight of Round Bar 1 ft. long. Area of Square Bar in Square Inches. Area of Round Bar In Square Inches. Circumference of Round Bar in Inches.
Page 41 - In filling walls, if the wall is solid throughout its length and height, it may not be possible to fill an entire story at one operation, in which case it makes little difference whether the wall is filled up half way all around, or a section filled up the entire height of the story. As the concrete is usually dumped into the wall forms from the top, a...
Page 4 - ... set on the column footings, and run jack trusses from these to support the forms above, thus avoiding any settlement of the forms due to improper foundations. Trusses should also be used where it is desired to hasten the laying of the finished floor, especially the ground floor for the trenches can be dug for pipes, etc., without having to wait two weeks or more to remove the props which would be in the way of the work.
Page 7 - ... closer together at the bottom than at the top, due to the hydrostatic pressure of the wet concrete tending to burst the forms; there is a common fault among contractors to skimp on the number of collars.
Page 4 - When the props supporting the first tier or story rest on the ground, it is a very difficult matter to maintain a strictly level floor, due to the shores sinking in the ground when softened by rains, or in cases where the ground is of a yielding nature; in such case it is best to truss from...