![]() (Nail holes are optional and may further expedite installation. In specifying Indiana Gratings Embed Frames, you are specifying durability, accuracy and economy. ![]() Frames provide a uniform bearing surface for grates or covers, often eliminating rocking or irregular elevations experienced with covers installed on poured concrete. During construction, these rigid 1/4" (minimum) thick steel frames expedite forming and provide a welded structure that assures accuracy in the concrete pour. Frames form a permanent shield for concrete lead edges and perimeters which are subject to cracking and chipping when left unprotected. When the grating is properly anchored and the span is continuous over 3 or more supports, the above spans may be increased by a multiple of 1.20.Įmbed Frames cast into concrete floors and substructures serve a multitude of purposes that extend the effective life of your completed construction project. The safe spans indicated for heavy duty gratings and bridge decking in the preceding load tables are based upon simple span calculations. Common applications include bridge floors, highways, inlets, and airport trench drain covers. Bridge decking is often the preferred heavy duty grating for concentrated or stress applications subject to impact and repetitive loads. The resulting product is an exceptionally durable heavy duty grating with superior stiffness and lateral stability. NOTE: IN THE EVENT THAT A CROSS BAR SIZE IS NOT SPECIFIED, THE CROSS BAR SHALL BE SELECTED AT THE DISCRETION OF THE MANUFACTURER.īridge Decking is manufactured by cold-press riveting truss shaped recticuline bars to rectangular bearing bars. When specifying gratings with bearing bars centered at 1-3/8”, 1-7/8” or 2-3/8”, consideration of Severe Loading cross bars is highly recommended. Ideal for trench covers, highways and inlet grates, these cross bars enhance lateral stiffness thereby extending the service life of the grating. The cross bars listed for Severe Loading are optional and will provide superior rigidity and durability when gratings are subjected to intense, continuous or repetitious traffic. ![]() It is suggested that these sizes be specified when the grating is subject to intermittent traffic and only occasional full capacity loading. These sizes have been selected to maximize manufacturing efficiency and economy. The sizes listed for Standard Loads are the standard twisted square or round cross bars supplied by Indiana Gratings for a particular bearing bar size. The table below details alternative cross bar sizes available. While bearing bar selection is critical for specifying a proper heavy-duty grating for your application, the life-cycle of your installation will often be influenced by selection of the appropriate cross bar. These tables incorporate strict limitations where design deflection shall not exceed the lesser of L/400 of the safe span indicated or 1/8 of one inch (.125). The load tables on pages 11-13 provide the maximum safe clear simple span for our most popular products based on the maximum traffic conditions defined. Once the bar spacing is selected, the bearing bar size must be specified based upon the anticipated load and the clear (unsupported) span to be served. ![]() Optional serrated bearing bars can be specified to enhance skid resistance. The welded band bar helps distribute impact loads and minimizes panel distortion when subjected to repetitious traffic patterns. If your particular load conditions are not adequately addressed in the load criteria presented, please contact our engineering staff and we will be pleased to assist in the selection of a heavy-duty grating to satisfy your specific needs.īecause heavy-duty gratings are commonly subjected to shock and impact loads it is highly recommended that all open ends be banded. Automobile and forklift loads are similarly evaluated with loads calculated and distributed in accordance with the criteria shown below. Indiana Gratings Heavy-Duty products are designed in accordance with current AASHTO specifications for H-10 through H-20 loads. Since these conditions can range from light-duty forklifts to semi-trucks and trailers carrying maximum allowable highway loads, heavy duty gratings are manufactured in a wide variety of bar sizes and spacings. Welded Heavy-Duty products are designed to meet the need for gratings subject to heavy rolling and static loads such as highways, plant floors, loading docks, inlet covers and airports.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |