Drawings Specification - Amendment 2.pdf

FY 11 General Instruction Building (GIB) Presidio of Monterey 1624 hexagonal-recessed-head setscrews.

(2) Mitered and welded joints made by fitting post to top rail and intermediate rail to post, mitering corners, groove welding joints, and grinding smooth. Butt railing splices and reinforce them by a tight fitting interior sleeve not less than 6 inches long.

(3) Railings may be bent at corners in lieu of jointing, provided bends are made in suitable jigs and the pipe is not crushed.

b. Provide removable sections as indicated.

2.9 Gutter Filter Screen

Gutter Filter Screen provides first line of filtering for rainharvesting cistern system. Body of screen shall be annodized aluminum channel frame, attached to gutter with stainless steel screws. Filter screen shall be type 316 stainless steel alloy, super fine mesh, 900 holes per inch. mesh shall have 8100 holes per square inch, and allow no particles larger than 50 microns to pass through the mesh .

2.10 LADDERS

Fabricate vertical ladders conforming to Section 7 of 29 CFR 1910.27. Use 2 1/2 by 3/8 inch steel flats for stringers and 3/4 inch diameter steel rods for rungs. Rungs to be not less than 16 inches wide, spaced one foot apart, plug welded or shouldered and headed into stringers. Install ladders so that the distance from the rungs to the finished wall surface will not be less than 7 inches. Provide heavy clip angles riveted or bolted to the stringer and drilled for not less than two 1/2 inch diameter expansion bolts as indicated. Provide intermediate clip angles not over 48 inches on centers.

2.11 MISCELLANEOUS PLATES AND SHAPES

Provide for items that do not form a part of the structural steel framework, such as lintels, sill angles, miscellaneous mountings and frames. Provide lintels fabricated from structural steel shapes over openings in masonry walls and partitions as indicated and as required to support wall loads over openings. Provide with connections and fasteners.

Construct to have at least 8 inches bearing on masonry at each end.

Provide angles and plates, ASTM A 36/A 36M, for embedment as indicated.

Galvanize embedded items exposed to the elements according to

ASTM A 123/A 123M.

2.12 GUARDRAILS

Locate guard rails where indicated. Mount the top rail3 feet 6 inches above the ground and mount the lower rail 2 feet above the ground.

2.13 STEEL STAIRS

Provide steel stairs complete with stringers, metal-pan concrete-filled treads, landings, columns, handrails, and necessary bolts and other fastenings. Steel stairs and accessories to be shop painted.

2.13.1 Design Loads

Design stairs to sustain a live load of not less than 100 pounds per square

05 50 00- 12 AM-05

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