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5ffi'>sf«i- <br />f; <br />3.1.3 <br />3.1.3.1 <br />3.1.3.2 <br />3.1.3.3 <br />3.1.3.4 <br />3.1.3.5 <br />3.1.3.6 <br />Bridges: <br />General: <br />Bridges <br />lumber, <br />tudinal <br />Articles <br />apart as <br />A bridge shall be required between every pier and shore, <br />shall have timber decks constructed of 2" x 6" or 2** x B" <br />adequately supported, installed perpendicular to the longi- <br />axis of the bridge and meeting the material requirements of <br />2.1.1.1 through 2.1.1.4. Deck boards shall be spaced 1/8" <br />indicated in Article 3.1.1.9. <br />Length: Bridges shall be of such a length tj never exceed a 1 verti­ <br />cal to 4 horizontal slope with the water level at an elevation of <br />__ _ _ _ _ feet below LWO. (See contract drawings for top of bridge <br />elevation/s.) <br />Bridge Connections: The bridges may be hinged at one end and have a <br />sliding or roller( wheeled) connection at the other to allow for <br />movement due to fluctuating wa^''r levels. Wheels shall be of adequate <br />strength to carry the design live loads applied to the bridge in <br />addition to the weight of the bridge, handrails, and utilities. <br />Hinged connections at both ends may be used if the anchorage system <br />used allows for the horizontal movement of the pier(s). In all cases, <br />the bridge connections shall be so designed as not to present any <br />excessive openings or significant differences in elevation between the <br />bridge and point of connection at the shore and pier under a range of <br />lake levels from_ _feet above to_ _below LWO. <br />A hinged threshold plate shall be used with a sliding or roller <br />type connection where the bridge joins the pier to avoid a step. The <br />bottom of the ramp shall be designed so tnat the step, without the <br />threshold plate, shall not exceed 6 inches. The required hinge <br />threshold plate shall be attached at the bottom of the bridge, shall <br />be the full width of the bridge and shall be 36 inches long if the <br />step is 6 inches high. For lessor height steps, the length of the <br />threshold plate shall be proportioned accordingly. The threshold <br />plate shall be fabricated from galvanized steel plate of adequate <br />strength and design to prevent abnormal deflection and shall have a <br />slip resistant surface. <br />Galvanized steel plates of a minimum 10 gauge thickness shall be <br />installed on the pier deck using zinc or cadmium plated flat head wood <br />screws under bridge wheels, sliding surfaces and threshold plates to <br />prevent damage to the deck surface. Edges and corners of these plates <br />shall be rounded to reduce the possibility of tripping. Plates shall <br />be of adequate size that wheels, sliding surfaces and threshold plates <br />will remain on them under any positioning which would occur due to <br />movement of the anchorage system or variation in design water levels. <br />The end of the pier under the bridge shall have a galvanized angle at <br />le^st 4" X 4" X 1/4" in size installed horizontally across the full <br />wid^h of the pier on the top edge of the pier. It shall be installed <br />15 -