1976-11-22 Regular Meeting - Laserfiche WebLink

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• SPECIAL SPECIFICATIONS • One (1) track paver to meet the following specifications • BID SPECIFICATIONS FOR THE TRACK PAVER WITH RUBBER-TIRED UNDERCARRIAGE WITH ELECTRIC HYDRALIC CONTROLS A towed-type paving machine, using high quality components, steel, and manufacturing. processes. The quality of manufacture and dependability of parts and service provided by the manufacturer shall be a consideration in the award of this bid. The paver shall have a three-ton storage hopper.. The back of the hopper shall not exceed 33 1/2 inches in height. This height measurement has been determined as being the maximum height that a person can conveniently shovel over the back of the paving machine, in order to_fill in-the void that occurs at the start of a paving cycle, when he is working from a wall or other rear obstruction. The hopper shall be equipped with a shut-off gate, operated by a hydralic cylinder_capable of producing eight tons of closing force. This cylinder shall be operated by a central hydralic hand pump. The shut-off gate shall pivot forward from the back wall of the paver. The hopper shall be mounted on two sets of dual tnadem pneumatic rubber tires (8 tires), 5.30 x 6 six-ply, mounted in line, two tires in front and two directly behind, that are walking-beam supported town adjustable undercarriage frame, providing four different height settings. • The paver shall be capable of laying asphalt from a minimum depth, being determined by the largest-sized aggregate in the mix, to a maximum of six inches in asphalt. By adjusting the undercarriage frame to its maximum height, the paver shall be capable of spreading material to a maximum depth of ten inches. (MAXIMUM WIDTH. OF 12 FT. ) The screed which supports the back of the hopper shall be pivoted from a universa l joint. This screed shall be adjustable by two depth screws with a handle. The depth screws shall be of steel construction, running through threaded cast iron nuts, with high pitched acme threads, in order to assure ease of adjustment. These depth screws shall be flexibly mounted, and the center line of the screed screw. shall-meet the screed frame not more than four and one-half inches ahead of the trailing edge of the screed. This requirement will alleviate any undue flexing to the rear portion of the screed which could cause a deflection in the mat being laid by the paving machine. The screed shall be equipped with a crown and invert device on both the leading and trailing edges. This device shall be operated by one ratchet controlling both leading and trailing edge adjustment simultaneously. Screed extensions shall be provided. allowing two feet of width adjustment.on each side of the screed plate. These screed extensions shall be mounted on two heavy-wall pipes which run through two bearings within the screed housing providing excellent support to the extensions. Each of the bearings housed within the screed must be at least 12 inches long. The bearings must be internally machined to assure ease of operation. The screed extensions shall be operated by a mechanical • means that provides infinite width adjustment during all paving operations. The durability of the mounting of these extensions shall be a consideration in the award of this bid.