ARCHIVED REPORTS - Laserfiche WebLink

Home Browse Search

' 1 c. Reduction in thickness: minus 5 percent of specified thickness. 2 3 7. Variation in Steps: a s a. In a flight of stairs: rise, 1/8-inch; tread, 1/4-inch. 6 7 b. In consecutive steps: rise, 1/16-inch; tread, 1/8-inch. e 9 8. Variation from established lines and grades in sidewalks, plazas, outdoor concrete slabs, 10 curb and gutter sections: in 10 feet, 1/4-inch; in 1 foot, 1/8-inch. 11 12 3.06 REINFORCEMENT 13 ' 14 A. Design: The reinforcement design shown on drawings shows only the necessary information 15 for detailing the reinforcement and preparing placing and bending details. Prior to starting 16 concrete work, submitted detailed shop drawings shall be approved. ' 17 18 B. Bending: In accordance with CRSI Manual of Standard Practice, Chapter 7. 19 20 C. Placement: Place reinforcement accurately as shown. Adequately secure metal reinforcement 21 in position by concrete or metal chairs and spacers, in accordance with CRSI Manual of 22 Standard Practice, Chapter 8. Distance between the steel and the surface, as shown; 23 otherwise, in accordance with Chapter 8. In walls, use bolsters between form and 24 reinforcement to prevent lateral displacement of reinforcement and to insure proper concrete 25 cover. 26 27 D. Splices: Locate splices of reinforcement as shown. For any splices not shown, assume 26 Class B splice. See drawings for splice lengths. Stagger splice in adjacent bars. Lap 29 adjacent sheets of wire mesh a minimum of 6 inches and securely wire. 30 31 E. Inspection: After reinforcement has been placed, it shall be inspected and approved before 32 placing concrete. 33 34 F. Conditions of Surfaces: At time concrete is placed, all metal reinforcement shall be free from 35 rust, scale, frost, or other coatings that would destroy or reduce the bond. 36 37 3.07 JOINTS AND EMBEDDED ITEMS ' 38 39 A. Construction Joints: 40 41 1. Obtain approval for joints not shown and locate them where they least impair the 42 strength of the structure. Unless otherwise shown on the drawings, joints in walls and 43 columns shall be at the underside of floors, slabs or beams, and at the top of footings 44 or floor slabs. Place beams at the same time as slabs. At least two hours shall elapse 45 after depositing concrete in columns or walls before depositing concrete in supported 46 beams or slabs. As the new concrete is placed, re-vibration in tops of columns and 47 walls is desirable. Make joints perpendicular to the main reinforcement. 48 as 2. All horizontal construction joints in walls shall have a continuous wood screed strip at 50 the outer face of joint to form a true line. Screeds shall be removed and the reglet 51 thoroughly cleaned out before pouring the next portion of wall. 52 CONCRETE 042894 03100-11