HIGH MAST LOWERING DEVICE 813.02
813.01 Description
This work consists of providing and installing a lowering device for high mast pole assemblies.
813.02 Materials
Before starting high -mast lighting work, submit to the Resident Engineer two (2) hardcopies of brochures for, and a schedule of, the proposed materials and equipment replacement parts for high mast lowering devices. Submit to the Resident Engineer two (2) hardcopies of the service and operating manuals. Include brand names, catalogue numbers, descriptions, cuts, diagrams, shop and design drawings (with part numbers and material finishes labeled), and calculations as required by the Contract. Do not inclu de materials otherwise covered by these Standard Specifications on the schedule. The Resident Engineer may waive submittal requirements if the materials and equipment are listed on the Department’s Traffic Engineering Division Qualified Products List. Ensu re the lowering device manufacturer has at least 5 years experience manufacturing and installing the device, and is approved by the Design Engineer. The Design Engineer will make final acceptance of the lowering device design.
A.Structural Design Provide a lowering device that consists of three main sub -assemblies: head frame, lowering ring, and winch assembly. Ensure the material is corrosion -resistant (stainless or galvanized steel, or aluminum). Ensure fixtures on the lowering devices pass an accelera ted vibration test of at least 1 g. Determine the actual loading for the high mast pole design by performing a full -scale wind tunnel test on the complete system, consisting of the lowering device and the luminaires. Provide a lowering device capable of lo wering a ring of luminaires to within 3 ft [1 m] of the pole base to ensure safe and efficient, routine luminaire maintenance. Provide each pole with a power cable and connectors to energize the entire ring of luminaires while the lowering device is in the lowered position. Provide a weatherproof, twist -lock service receptacle for this cable, rated at 600 V. Provide equally spaced hoisting cables, attached to the luminaire ring. Provide a method to equalize the tension on the hoisting cables. Provide hoi st cables of 7 × 19 construction aircraft cable, 3/16 in [4.76 mm] diameter, zinc -coated galvanized steel, in accordance with MIL Specification W834420C and Federal Specification RR-W-410E. Provide a winch cable of ¼ in [6.35 mm] diameter, zinc-coated, ga lvanized steel, using high strength 7 × 19 construction aircraft cable.
813.02 High Mast Lowering Device
In the raised position, ensure minimal free movement in the luminaire ring. Rigidly suspend the luminaire ring from equally spaced points with mechanical latches or with cables in ten sion as shown on the Plans and approved by the Resident Engineer. Provide the following luminaire ring suspensions as required by the Contract:
1.Type I Provide a positive automatic mechanical latching system not requiring manual or electrical tripping d evices to latch or unlatch the system. Ensure the portion of the latching system permanently attached to the top of the pole with no moving parts or parts requiring adjustment after erection of the pole. Provide lowering devices with visual indicators of positive latching. Prevent ice or snow accumulations from impairing the latching system. Ensure the removal of tension from the hoisting and winch cables when the luminaire ring is latched.
2.Type II Ensure a positive guide and positioning method for the cables to prevent the luminaire ring from moving. Keep the hoisting cables in constant tension. Provide a method to equalize the stress on each cable and remove tension from the winch and cable assembly when the luminaire ring is in the raised positi on. Install guide arms, rollers, or both on the luminaire ring. This assembly will consist of the following: A roller contact, Spring loaded, cast aluminum arms designed to protect the pole, Luminaries, and Lamps. Ensure the centering system keeps the ring luminaire concentric to the pole, prevents the ring from hanging up, prevents damage to the tower shaft finish, and constantly keeps the luminaire ring equidistant from the pole during raising and lowering. Ensure that the centering arms interconnect to prevent the system from jamming on the pole during high winds. Provide stainless steel springs and non -marking rollers. House self -lubricating pulleys, located at the top of the pole, under a weather -tight cover with coloring similar to the support a ssembly. Provide at least six hoist cable sheaves at least 6 in [150 mm] in diameter. Machine the cable groove in each sheave with a circular cross -section to match the hoist cable diameter. Provide sheaves in accordance with the requirements of ASTM A 1023. Ensure lowering device systems are stable and capable of operating in 30 mph [48 km/h] winds. Provide a lightweight, remotely -controlled, portable motor to power the lowering device winch. Provide a heavy -duty reversible motor with at least 1 hp [75 0 W], and a stalled torque at least twice the torque required for the lowering device. Provide for manual operation of the lowering device in case of power failure. Obtain written certification from the lowering device manufacturer that the lowering devic e design works with the high mast pole and luminaries, and that the total system functions HIGH MAST LOWERING DEVICE 813.02 mechanically and electrically. Ensure the lowering device and fixtures include manufacturer warrantees. Do not install an electromechanical disconnect in the circui t that supplies power to the luminaires at the top of the pole. Wire the power cable directly to the terminal blocks in the junction box on the luminaire ring. Attach the power cable to the luminaire ring and ensure support the full weight of the cable in the raised luminaire position. Provide a NEMA 3R aluminum junction box including a weatherproof inlet on the ring exterior for testing the luminaries and lamps at ground level. Provide a factory pre-wired enclosure with the number of 16/3 Type ST cords for the luminaires and main power cord size as recommended by the manufacturer and approved by the Resident Engineer. Attach the power cord to the ring using cable clamps.
B.Materials
1.Wire Rope Attachments Obtain approval from the Resident Engineer f or wire rope attachments. Install and torque wire rope attachments in accordance with the manufacturer recommendations.
2.Luminaire Rings and Mast Arms Provide luminaire ring and mast arms constructed of No. 7 gauge weldable, structural steel with a hot dip galvanized finish. Provide mast arms with 2 in [50 mm] diameter pipes with slip -fitter connections to the high mast luminaries. Equally space the arms around the ring, unless otherwise shown on the Plans. Provide the number of mast arms as shown on the Plans. Provide a weatherproof luminaire ring pre -wired to distribute power from the main power cable. Ensure easy mast arm attachment and removal. Provide one mast arm for each high mast luminaire.
3.High Mast Support Assembly Provide a weldable str uctural -steel high -mast support assembly that attaches to the pole shaft. Devise a pole attachment method in cooperation with the pole manufacturer to prevent the support assembly from rotating on the pole top. Ensure the support assembly houses the pull eys and mechanical latching devices.
4.Winch Assembly Provide a self -locking worm gear drive winch assembly with a reduction ratio of 30:1. Place the winch assembly at the base of the pole shaft, adjacent to the hand hole. Equip the winch assembly with a take -up guide to prevent cable overlap. Provide a winch assembly capable of raising and lowering the luminaire ring and luminaires at least 10 ft/min [3 m/min]. Provide a winch containing an inboard and outboard support, designed to operate by hand or mechanically, using a portable motor. Ensure the winch cable is securely attached to the winch drum with at least three wraps around the drum when the luminaire ring is in the lowered position.
813.02 High Mast Lowering Device
5.Aircraft Obstruction Markers Provide luminaire rings wi th a double FAA -approved red aircraft obstruction marker and a dry transformer, mounted on the ring assembly with a bracket unless otherwise required by the Contract. The Resident Engineer will not accept pipe with conduit lock rings for brackets. Ensure marker is visible 360° around the pole, and wired to power on and off with the luminaires. Provide lights equipped with a multiple transfer relay for instant transfer to a reserve lamp if the operating lamp fails. Install the plug -in transfer relay in a w eather -tight enclosure.
6.Lightning Rod and Arrestor Attach a lightning rod to the lead frame assembly and wire to ground. Ensure that the assembly includes a lightning arrestor at the junction box on the luminaire ring.
7.Hardware Provide hardware made of non -corrosive materials or plated to a compatible thickness to the structural parts of the lowering device.
8.Fasteners Secure fasteners and pins to prevent loosening by vibration. Provide self -locking nuts, jam nuts, and cotter pins.
9.Poles Ground the pole as shown on the Plans. Provide an assembly that includes a circuit breaker in the base of the pole, sized for the voltage and phasing supplied for the luminaire load. Provide an aluminum or zinc -plated steel cover for the circuit breaker. Provide a pigtail cord and plug from the circuit breaker assembly. Ensure the cord and plug are compatible with the main power cord of the lowering device system.
C.Welding Weld in accordance with AWS D1.1. The Department will not allow field welds. Visually inspect welds and test using the ultrasonic method in accordance with AWS D1.1, the magnetic particle method in accordance with ASTM E 709, or the radiographic method in accordance with ASTM E 94, E 390 or E 142-92. Submit certified test results, if requested by the Resident Engineer. Complete welding and remove weld splatter before finishing.
D.Finish Galvanize the high mast lowering device after fabrication in accordance with ASTM A 123 / A123M - 15 (AASHTO M-111M/M111 2015). TRAFFIC SIGNAL CONTROLLER ASSEMBLY 825.02
813.03 Equipment — Vac Ant
813.04 Construction Methods
Work with the manufacturer’s representative to ensure correct installation of the lowering device. Obtain a written installation and operation manual from the manufacturer of the lowering device. Obtain at least 5 copies p er project or one copy per device, whichever is greater. After installing the lowering device on the tower, but before erecting the tower, request that the Department’s Traffic Engineer inspect the fully rigged device. Erect the tower after the Traffic En gineer's inspection and the Resident Engineer’s approval.
813.05 Method of Measuremen T — Vacant
813.06 Basis of Payment
The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit: HIGH MAST LOWERING DEVICE Each Include the cost of attachments, wiring, circuit breakers, and other accessories in the contract unit price for High Mast Lowering Device . SECTION 825 TRAFFIC SIGNAL CONTROLLER ASSEMBLY
825.01 Description
This work consists of providing and installing a full -actuated traffic controller assembly including cabinet, solid -state full -actuated controller unit, load switches, flasher, conflict monitor, and related documentation.
825.02 Materials
Provide a controller assembly in accordance with NEMA Standards Publication TS -1, Traffic Control System (NEMA TS-1). If shown on the Plans, provide a controller assembly in accordance with NEM A Standards Publication TS 2, Traffic Controller Assemblies with NTCIP Requirements (NEMA TS-2).
A.Full-Actuated Traffic Signal Controller
1.Hardware Design Requirements Ensure each controller unit has a permanent label on the unit face displaying a uni que serial number. Provide solid -state, digitally -timed controller units. Synchronize the controller timing
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 829–832 of 935.