Amendment 0003 - Attachment 18. Grating and Fall Protection Railing Criteria.pdf
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- Solicitation number
- 36C26223B0016_1
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This document provides criteria for fiberglass grating and fall protection railing to be installed as part of a federal contract opportunity with the Department of Veterans Affairs. The criteria specify that the grating shall be 2-inch square mesh fiberglass grating with a maximum span of 48 inches. The grating and support system must be engineered and stamped by a registered professional engineer to support a 50 psf live load plus a 300 lb concentrated load. Deflections must be limited to L/240 under loading. Beam connections require a minimum of two 1/2-inch bolts and anchors to concrete shall be 5/8-inch diameter Hilti Kwik Bolt TZ2 or Hilti HIT RE-500 V3 adhesive anchors. A minimum of two holddown clips per section are required at each support point and abutment clips must be installed at midspan of unsupported edges.
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GRATING CRITERIA
1. Contractor shall be responsible for layout and engineering of the complete grating support system and its connections and anchorage. Calculations and drawings shall be submitted for review and approval and shall be stamped by a registered Professional
Engineer (PE).
2. Grating shall be a commercial grade 2‐inch deep by 2‐inch square mesh open molded fiberglass grating. Maximum grating span shall be 48‐inches.
3. Fiberglass shall be manufactured from a premium grade Isophthalic Polyester Resin system with Class I fire retardancy per ASTM E‐84.
4. Grating support system shall consist of fiberglass structural shapes and ledge angles and their design shall conform to the following requirements:
a. Support beams shall be designed for a 50 psf uniform live load over the entire tributary grated area plus concurrently a 300 lb. concentrated load applied at the center of the beam span.
b. Deflections of support members and ledge angles shall be limited to L/240 under the above loading conditions.
5. Beam to beam structural connections shall be a minimum of two (2) 1/2‐inch diameter bolts.
6. Anchorage to concrete shall be with minimum 5/8‐inch diameter anchors. Acceptable anchors are Hilti Kwik Bolt TZ2 or adhesive anchors using Hilti HIT RE-500‐ V3 adhesive anchoring system.
7. A minimum of two hold‐down clips shall be installed on each fiberglass grating section at each support point. Install abutment clips at midspan of all unsupported grating edges to tie the adjacent grating sections together.
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