§ 721S.4. Quality of Work

A.

Fabrication and Assembly

1.

Fabrication shall be in accordance with either AISC 325 or 360.

2.

Fabricate and assemble structural assemblies in the shop when possible. When shop fabrication is not practical, provide markings as required to facilitate assembly.

3.

Fabricate in such a manner so as to limit storage and handling and not to hinder construction progress.

B.

Fabrication tolerances for rolled shapes, plate girders, plates, bars, wide flange sections, and miscellaneous steel shall be in accordance with ASTM A 6 (A6M) or AWS D1.5 (D1.5M).

C.

Rolled fabricated sections of slightly different dimensions and weight than the standard sections shown will be acceptable, provided they have equal or greater Moment of Inertia and Section Modulus than the sections(s) detailed. Changes in section(s) shall be clearly noted on the shop drawings.

D.

Maximum deviation from flatness for webs of wide flange sections shall be the same as for built-up girders.

E.

Shoes shall be fabricated with a tolerance not greater than the following:

1.

The top bolster shall have the center 75 percent of the long dimension true to 1/32 inch (0.8 mm), with the remainder true to 1/16 inch (1.6 mm) and shall be true to 1/32 inch (0.8 mm) across its entire width in the short dimension.

2.

For a pin and rocker type expansion shoe, the axis of rotation shall coincide with the central axis of the pin.

3.

When the shoe is completely assembled and the top bolster is moved horizontally simulating the movement of the shoe in the finished structure, no point in the plane of the top bolster shall change elevation by more than 1/16 inch (1.6 mm) for the full possible travel of the rocker both ways from the neutral position nor shall the top bolster change inclination with respect to the horizontal by more than 1 degree during this same travel.

F.

I-beams and girders shall be fabricated with a tolerance not greater than the following:

1.

The plane of the bearing area of beams and girders shall be perpendicular to the vertical axis of the beam within 1/16 inch (1.6 mm).

2.

Correction of bearing areas of shoes, beams and girders to the above tolerances shall be with heat and/or external pressure. Grinding or milling will be permitted if reduction of required thickness of member is not reduced by more than 1/16 inch (1.6 mm).

3.

Rolled material must be straight before being laid off or worked.

4.

If straightening is necessary, it shall be done by procedures submitted to and approved by the Engineer or designated representative. Sharp kinks and bends will be cause for rejection of the material unless corrected to the satisfaction of the Engineer or designated representative.