GATE REPAIR AND REPLACEMENT AT DISTRICT 7 AND FREDERICK SHOP

2026-11-03

The General responsibility of the Contractor to Repair / Replace two gates at the District 7 and Frederick facility including labor and materials within the scope of the following definitions of work : Gate : The Contractor shall furnish and install one ( 37 ’ in length ) Aluminum Cantilever Slide Gate with a 25 ’ opening . Specification for the materials and construction requirements for chain link cantilever slide gates with enclosed aluminum track and hardware manufactured to comply with ASTM F - 1184 , ASTM F - 2200 , and Underwriter ’ s Laboratory UL - 325 safety standards . The gate frame and support members shall be manufactured with the same aluminum material , alloy , and temper 6061 - T6 ( ASTM 1184 ). • The fabricated chain link cantilever slide gates shall be in accordance with ASTM F - 1184 , Type II , Class 2 , using 2 - inch square aluminum outside vertical members ( 1 . 04 lb / ft ). Members are welded together with a continuous top track ( 2 . 70 lb / ft ) and bottom rail to form a rigid one - piece frame . Vertical interior support uprights shall be positioned equally throughout the frame structure . • The vertical interior support uprights will be 2 - inch square aluminum tubing weighing ( 1 . 04 lb ./ ft ) welded in place to form a ridged one - piece unit . • The bottom rail shall be a continuous one - piece 3 3 / 8 - inch by 2 3 / 8 - inch one - piece aluminum extrusion weighing ( 2 . 70 lb .). • The top track shall consist of a single 6 - inch by 2 ¾ - inch one - piece aluminum extrusion weighing ( 5 . 30 lb ./ ft ); top track shall withstand a 2 , 000 lb . reaction load . • The cantilever overhang will be 40 % or greater for any given opening size . • There shall be one truck assembly ( secured to the guideposts ) which operates inside the top track . It shall be swiveling type zinc die cast with 4 sealed and lubricated ball bearing rollers ( 2 ” dia ., 9 / 16 ” width ) and two side rollers for the gate ( front and back ) to assure alignment in the top track . • Chain link fabric shall be installed over the entire gate length ( UL - 325 ) which will create a universal design ( gate shall be used for right - or left - hand applications ). Fabric will be attached securely with tension bars that are attached on either frame end by tension bands . • High tensile wire shall be providing additional fabric support across the top and bottom of the gate structure with the minimum of three strains of barbed wire including hanger brackets on top of the gate . • Diagonal bracing shall be 1 ¼ - inch square aluminum tubing weighing ( 0 . 66 lb ./ ft ) welded in place to the uprights to form a rigid bracing system that does not require field adjustment • Gate brackets , hangers , latch , and keepers shall be ( HDG ) galvanized steel . There shall be a standard latch provided to allow the gates to be locked from either side ( inside or outside ). • Install gate plumb on existing outer post and furnish and install two inner 6 ” galvanize post and provide caps for each post ; the contractor shall verify that the existing mounting post are level and secure for the full opening size making sure they move free of obstructions . Adjust hardware for smooth operation . Note that the contractor may need to verify that the existing trench that the cantilever gate slides into is clear and does not obstruct the new cantilever gate operation . • Contractor shall make the necessary adjustments to the existing posts , braces , brackets and fencing material may be required to realign the gate ; the cantilever slide gates must comply with the performance deflection criteria listed in ASTM F1184 . The gates must be designed to open or close with the assistance of the rollers by applying an initial pull force no greater than 30 lbs . and shall meet evenly in the middle when closed . • The rolling assemblies must be designed to handle the forces based on the gate size , opening and height . Gate Operator Frederick Maintenance Complex : • The contractor shall lock out tag out the gate disconnect located on the outside wall of the maintenance shop . • The contractor shall remove and dispose of the existing gate controller / furnish and install new Lift master model INSL24Ul MC ( or approved equal ) gate operator 1 phase 208 - 230 - volt 1H / P 9 . 3 Amp gate operator with the LB . Max Force of 2200LB .

Maryland

2026-04-08