§ 15.01.1170. Joints.

A.

Construction joints for structures. Construction joints shall be installed as shown on the drawings. If construction joints are needed which are not shown on the drawings, they shall be placed in locations approved by the engineer.

Where a feather edge would be produced at a construction joint, as in the top surface of a sloping wall, an insert form shall be used so that the resulting edge thickness on either side of the joint is not less than six inches.

In walls and columns, as each lift is completed, the top surfaces shall be immediately and thoroughly protected from any condition that might adversely affect the hardening of the concrete.

Steel tying and form construction adjacent to concrete in place shall not be started until the concrete has cured at least twelve hours. Before new concrete is deposited on or against concrete that has hardened, the forms shall be kept moist for at least one hour prior to placement of the new concrete.

B.

Expansion and construction joints for structures. Expansion and contraction joints shall be made only at locations shown on the drawings.

Exposed concrete edges at expansion and contraction joints shall be carefully tooled or chambered, and the joints shall be free of mortar and concrete. Joint filler shall be left exposed for its full length with clean and true edges.

Preformed expansion joint filler shall be held firmly in the correct position as the concrete is placed.

When open joints are specified, they shall be constructed by the insertion and subsequent removal of a wooden strip, metal plate or other suitable template in such a manner that the corners of the concrete will not be chipped or broken. The edges of open joints shall be furnished with an edging tool prior to removal of the joint strips.

C.

Construction joints for sidewalks. Sidewalks shall have contraction joints at intervals of ten feet (maximum), which joints shall be approximately three-sixteenths-inch wide and be approximately twenty-five percent of the total slab thickness. In addition, one-half-inch expansion joints shall be provided at fifty-foot intervals and at locations where sidewalks adjoin curbs or existing sidewalks, driveways, or aprons. Expansion joints shall be provided at four-foot intervals where manholes, valve boxes, or meter boxes are located within a sidewalk.

D.

Construction joints for curb and gutter. Curb and gutter shall be cut into lengths of ten feet (maximum) by the use of one-eighth-inch steel division plates of the exact cross section of the curb and gutter. Also, one-half-inch expansion joints shall be provided at curb and gutter radii where the curb and gutter abuts a solid object and at intervals not to exceed fifty feet unless otherwise specified by the city engineer or public works director.

Where curb and gutter are placed by slipform methods, the contraction joints every ten feet may be provided by cutting into the fresh concrete to a minimum depth of one and one-half inches to create a plane of weakness. The edges of such joints shall be rounded to provide a neat workman-like appearance. Expansion joints will be required at adjacent pavement, sidewalk, radius points, or structures.

(Ord. No. 2007-07-31, §§ 12.12—12.12.4, 7-10-2007)