§ 437S.4. Construction Methods

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A.

Paver Grate Frames

The paver grate frames shall be designed according to current American Institute of Steel Construction criteria and shall be capable of supporting 90 lbs per sq. ft. (4.31 kPa) of dead load and 110 lbs. per sq. ft. (5.27 kPa) of live load.

The paver grate frame shall be fabricated in conformance with Item 721, "Steel Structures" and Item 723,"Structural Welding" to the dimensions shown in Standard 437S-1. The completed frames shall be installed as shown in Standard 437S-1. The frames shall be securely bolted to the supporting concrete surround using 3/8-inch (9.5 mm) diameter expansion bolt anchors, or approved equivalent.

B.

Tree Grates and Frames

The paver grate frame shall be fabricated in conformance with Item 721, "Steel Structures" and Item 723,"Structural Welding" to the dimensions shown in Standard 437S-2, sheet 2.

The cast-iron tree grates shall be fabricated to the dimensions shown in Standard 437S-2, sheets 1 and 3,

The completed tree grate/frame shall be installed as shown in Standard 437S-2.

                    
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