When so designated on the drawings or ordered by the Engineer, the contractor shall furnish and drive interlocking steel sheet piling at the locations and to the depths as shown on the drawings or as ordered by the Engineer.
All piles shall be new piles, unless specifically modified in the project specifications, made of open hearth steel sheet, conforming to the latest standard specifications of the American Society for Testing Materials for Structural Steel, Serial Designation A-7, except for the following requirements: the minimum ultimate tensile strength shall be 70,000 pounds per square inch, and the phosphorous or sulphur content shall not exceed 0.06 percent. When copper steel is called for in the project specifications or ordered by the Engineer, copper content shall not be less than 0.20 percent. The minimum percent of an elongation in eight inches shall be 1,400,000 divided by the tensile strength. Bend test specimens shall stand being bent cold through 180 degrees around a pin, the diameter of which is equal to twice the thickness of the specimen, without cracking on the outside of the bent portion. The type, dimensions and properties of the steel sheeting shall be as stated in the project specifications.
Equipment and methods used for driving the interlocking steel sheet piling shall be subject to the approval of the Engineer. Strong guide timbers or framing composed of such timbers shall be used to hold the piles in line and to prevent rupture of the interlocks while being driven. A protecting cap shall be used in driving, and the hammer shall be of suitable size and shape. Combination water and air jets may be used to make the driving easier when so approved by the Engineer. Piles may be driven in pairs and shall be driven to line and grade progressively from the start. A tolerance of 0.1 of a foot, plus or minus, in line and grade will be allowed. Piling shall be driven plumb in all directions or with a slight backward inclination along the line of piles. Excavation performed, when authorized in order to facilitate the driving of steel piling, shall be backfilled and compacted, as hereinbefore specified. Driving of piles will not be permitted within 500 feet of concrete being placed or less than twenty-four hours old, nor within 200 feet of concrete less than seven days old.
Damaged piles, or piles in any respect improperly driven, shall be pulled and satisfactorily replaced by the contractor at no cost to the owner. Should continued driving on any pile result in battering the head so that it must be cut off in order to continue driving, the piles shall be so driven that the bottom of the pile is at the established grade, and the contractor shall supply and weld in place a length of pile equal to the length cut off to make up the total required length. (Ord. 352. Passed 10-22-62.)