Replacement of the Front Gate and Controller at the District 4 Office in Baltimore County

2026-11-03

The Maryland State Highway Administration ’ s District – 4 Maintenance Complex located at 320 West Warren Road 21030 Is soliciting a bid for a Contractor to remove / dispose of the existing 38 `. 6 ” cantilever HDG gate and furnish and install a new 38 . 6 ” cantilevering aluminum gate including an aluminum internal upper and lower dual trolley system that serve a ( 26 ft ) opening , And a new gate controller . The location of the project is at the Administration ’ s District – 4 maintenance Complex front entrance . Vendors should have a minimum of 5 years ’ experience in providing similar services . All work shall be complete within 30 calendar days from the NTP . SPECIFICATIONS Gate : • The Contractor shall furnish and install one ( 38 . 6 ” in length ) Aluminum Cantilever Slide Gate with 38 ’ 6 ” length x 5 ` 5 ” in Hight of fencing that serve a ( 26 ft ’) 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 F1184 , 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 fabricate 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 / ft ). • The top track shall consist of dual 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 two inner and two outer truck assemblies ( secured to the guideposts ) which operate inside the top track . They shall be swiveling type zinc die cast with 4 sealed and lubricated ball bearing rollers ( 2 ” dia ., 9 / 16 ” width ) and two side rollers per gate ( front and back and upper and lower ) 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 wires provide additional fabric support across the top and bottom of the gate structure . • 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 .

Maryland

2026-05-02