Tower SOW - CDCB RCAG.pdf

Cedar City RTR Antenna Tower

FABRICATION OF TWO (2) SELF-SUPPORTING 25-FOOT REMOTE

TRANSMITTER RECEIVER (RTR) ANTENNA TOWERS

AT THE

CEDAR CITY ARSR FACILITY, CEDAR CITY, UTAH

DESCRIPTION / SPECIFICATIONS / SCOPE OF WORK

The manufacturer/production shop shall furnish all labor, tools, parts, materials and facilities necessary to design, fabricate, and delivery of two (2) self-supporting antenna tower as required in accordance with the specifications contained in this section.

NOTE: Erection of tower and construction of foundations will be accomplished by the

Government or its Construction Contractor.

Contractor must have no less than 5 years experience in design, fabrication and construction of steel antenna towers, Contractor shall also have experience in design of concrete supporting foundations based on sound geotechnical information. Wiring all components and associated equipment and be capable and experienced in transporting antennas to active FAA facilities using specialized trucks, trailers and cranes. The contractor shall be regularly engaged in the fabrication of antenna towers with existing plant facilities equipped for year around antenna manufacturing.

1. SCOPE

1.1 Scope - This specification sets forth requirements for the following:

Design and fabrication of two (2) new 30-foot self-supporting eight-arm communication antenna towers, (see Enclosure 1).

Design of reinforced concrete foundation for the towers.

Design of Tower based on TIA-222-G.

Provide a rigid (type I) safety climbing device, including all required brackets, guides and clamps.

2. APPLICABLE DOCUMENTS

2.1 FAA Documents - The following FAA Drawings form a part of this specification and are applicable to the extent specified herein.

Enclosure (1): CDC-D-RTR-S001; RTR Antenna Towers, Platform & Antenna

Support Details. (REFERENCE ONLY)

Enclosure (2): Geotechnical Analysis extract for FAA by TBD, (expected date available June 15, 2016)

Enclosure (3): RAM Rail protection system product data sheet.

2.2 Military and Federal Publications - Tile following Military and Federal publications of the issues in effect on the dale of the request for proposal, form a part of these specifications.

2.2.1 Military Specifications (Mil. Specs.):

MIL-M-17l94 Metal, Expanded, Steel

2.2.2 Federal Specifications (Fed. Specs.):

RR-G-661 Grating-Bar Type

RR-S-001301 Safety Equipment, Climbing

2.2.3 Occupational Safety and Health Administration (OSHA) Standards:

Occupational Safety and Health Standards, Title 29, Part 1910

2.3 Other Publications - The following publications of the issues in effect on the date of title request for proposal form a part of this specification.

2.3.1 American Society for Testing and Materials (ASTM) Specifications:

A·36 Structural Steel

A-53 Pipe, Steel Black and Hot Dipped Zinc-Coaled Welded and Seamless Steel Pipe

A-123 Zinc (Hot-Galvanized) Coatings on Products Fabricated from Rolled, Pressed, and Forged Steel Shapes, Plates, Bars, and Stripes

A-153 Zinc Coating (Hot-Dip) on Iron and Steel Hardware

A-307 Low-Carbon Steel Externally and Internally Threaded Standard Fasteners

A-325 High Strength Bolts for Structural Steel Joints including Suitable Nuts and

Plain Hardened Washers

A-385 Providing High Quality Zinc Coating (Hot~Dip) on Assembled Products

A-441 High Strength Low Alloy Structural Steel

A-501 Hot-Formed Welded and Seamless Carbon Steel Structural Tubing

A-570 Hot Rolled Carbon Steel Sheet and Strip, Structural Quality

A-615 Deformed, and Plan Billet Steel Bars for Concrete Reinforcement

A-618 Hot Formed, Welded and Seamless H.S., Low Alloy Structural Tubing

2.3.2 American Institute of Steel Construction (AISC) Specifications: Specifications for the

Design, Fabrication and Erection of Structural Steel for Buildings, with Commentary.

2.3.3 American Iron and Steel Institute (AISI) Specifications: Specifications for the Design of light gage cold-formed steel structural members.

2.3.4 American National Standards Institute (ANSI) Standards: B18.22.1 Plain Washers

2.3.5 Telecommunications Industry Association (TIA): TIA-222-G Structural Standards for

Antenna Supporting Structures and Antennas

2.3.6 American Concrete Institute (ACI): Building Code Requirements

2.3.7 American Welding Society (AWS): Welding Handbook D 1.1

3. REQUIREMENTS

3.1 General Requirements – The tower furnished by the manufacturer shall be complete in accordance with all specification requirements including anchor bolts and all other hardware essential for erecting the tower. The contractor shall provide all materials, supplies, equipment, and services necessary to design, fabricate and prepare for delivery of tower for erection at the

Cedar City ARSR, Blowhard Mountain, UTAH. Contractor must also supply RAM Fall

Protection System (or equivalent subject to FAA review) with each tower, see attached product data sheet. Fall protection system must be rigid rail type (no cable type.)

3.2 Description - The towers shall be self-supporting type (30 ft.) galvanized steel structures with a platform at the top for mounting an eight-mount arm assembly, (see Enclosure 1) and servicing antennas. The tower height shall be measured from the top of the foundation to the top of the hand rail on the platform (plus or minus 12"). The tower shall be shipped in a knocked down form or partially pre-assembled, and ready to be erected in the field using structural bolts only. The tower shall be fabricated in no more than four sections to make up the total tower height. The members shall be fabricated from angular, tubular, or solid stock. The tower platform shall be large enough to permit installation of 8 antennas with 8 ft. minimum separation. This can be accomplished by providing a square or rectangular platform with retractable support arms similar to those shown in appropriate lengths and locations to provide 8 ft. antenna separation. The minimum area for the tower platform shall be 42 square feet (sq. ft.). Access to the platform shall be gained through a suitable hinged trap door with provision for being padlocked from the bottom. The weight of the trap door shall be 30 pounds (lbs.) or less. The trap door system may also be designed to have 2 doors (15 lbs. maximum each). It shall be possible to fully open and close the trap door when entering or leaving the platform without disengaging from the safety climbing device. The door(s) shall not be able to blow shut by high winds in the fully open position. The minimum clear climbing side opening in the platform shall be 1 foot (ft) - 3 inches

(in.) each way from the ladder centerline and 2 ft. - 6 in. clear opening from the ladder rung to the back of the opening. The platform shall be fabricated from the angle framing members and the floor of the platform shall be fabricated from either expanded metal grating or bar type grating. The floor shall be secured to the framing. The platform shall be provided with guardrail, composed of vertical posts with top and intermediate rail components located 45 in. and 23 in.

respectively above the platform floor. The perimeter framing members shall support the rail as well as the required antenna mounting brackets as well as provide a 4 in. high toe plate surrounding the platform walk area.

3.3 Design Requirements –

General: Engineering Standard to be utilized for design is TIA-222-G, with Structure Class III

(Essential Facilities), Exposure C, and Topo Category 4.

3.3.1 Live Load: The floor of the platform shall support a 300 lb. concentrated load over 2.0 sq.

ft. area in addition to a live load of 20 lbs. per sq. ft. over the entire platform. In addition to the live load on the platform, the tower and ladder shall be designed to support a minimum 500 lb.

concentrated load at any point on the ladder and its attachment to the tower in a free fall of 18 inches. Each individual ladder rung shall be capable of supporting a vertical load of 250 lb.

3.3.2 Wind Load: The tower shall be designed for a Zone C wind load per EIA/TIA Standard

222-G (90 miles per hour (MPH)) to support the platform with 45 in. high handrail plus the following:

(a) A 2-1/2 in. diameter antenna 48-in. long mounted vertically on each of the 8 antenna mounts.

(b) Two junction boxes each having a projected area of 6 sq. ft., mounted on platform railing.

(c) 16 antenna cables, each approximately 1-1/4” diameter routed vertically along the exterior face of the tower from the foundation up to the platform level.

(d) Climbing ladder, face mounted (or interior if there is adequate space) for the full height of the tower, with safety climbing device that is furnished by others.

(e) A single 3-in. diameter 20-foot high air terminal mast that extends vertically from the tower platform.

3.3.3 Tower Legs: The four tower legs shall be fabricated of structural steel, structural angles, or plates having minimum yield strength of 36,000 lbs. per square inch (sq. in.), per ASTM

Specification A-36 for angles and plates; or 33,000 lbs. per sq. in., per A-53 or A-501 for pipe.

Legs fabricated from steel having minimum yield strength of 50,000 lbs. per sq. in. shall conform to ASTM Specification A~618, Grade 3, for pipe or ASTM Specification A-44l for angles or plates.

3.3.4 Tower Braces: Tower angle braces shall have minimum yield strength of 36,000 lbs. per sq.

in., per ASTM Specification A-36.

3.3.5 Base Section: The base section of all self-supporting tower shall be fixed base utilizing load bearing plates drilled to receive anchor bolts cast in reinforced concrete foundations or it may be a short section or integral part of the first tower increment. If a separate short section is used it shall be cast in the concrete foundation and similar in construction to the other tower increments.

3.3.6 Bolted Connections: All bolts for structural joints shall be high strength per ASTM

SPECIFICATION A-325 fasteners. Secondary connections where bolts are less than ½ in.

diameter shall be of Grade 5 (SAE J 429) specification, if conditions permit. All nuts shall have locknuts. All fasteners shall be galvanized

3.3.7 Ladder and Safety Climbing Devices: The ladder shall be face-mounted (interior) for the full height of the tower and extend a minimum of 3 ft. - 6 in. above-the platform. The ladder design shall conform to OSHA standards including clearances and the distance between ladder rungs and ladder rails. The mounting devices that attach the ladder to the tower shall not extend beyond the rail edges on the climbing side of the ladder.

3.3.8 Tower Foundation Design: A foundation design shall be provided for height of the tower and the base of the pad placed at minimum depth of 36 in. below the ground surface. Design shall be based on the Geotechnical Analysis provided by FAA (reference TBD geotechnical

Analysis, Enclosure 2, to be available by June 15, 2016). Maximum allowable soil pressure of

2,500 PSF; Concrete strength shall be based on a 28-day compressive strength of 4000 pounds per square inch (PSI) and maximum slump of 4 in. Reinforcing steel shall be intermediate grade billet ASTM Specification A-615, Grade 60, deformed bars. The foundation designs shall be oriented toward economical construction based on the costs of labor and materials at the time of the design. The anchor bolts/anchoring system shall be furnished with the tower.

3.3.9 Tower Platform Handrails: The top hand rail shall be capable of taking a point load of 200 lbs. in any direction.

3.3.12 Design and Drawings:

3.3.12.1 Work Required - Provide field erection drawings and plans list.

3.3.12.2 Work Preparation - Drawing preparation shall be performed by the contractor to the extent required herein. Design shall be in accordance with established engineering practice and the ACI, AISC, AISI OR EIA specification as applicable. Design drawings shall show control dimensions, member sizes and other details as necessary for the development of shop and erection drawings. Erection drawings shall indicate anchor system, member location, bolt sizes and number and all other information to clearly depict requirements for field erection. A parts list showing the member number, size, and length shall be provided in the erection drawings.

A copy of the ERECTION DRAWINGS AND PARTS LIST WILL BE SHIPPED WITH

THE TOWER.

3.4 Materials - Unless otherwise indicated, materials shall conform to the specifications and other requirements indicated below. Where no specification is indicated, the materials shall be good commercial quality suitable for the Government's intended use and shall be subject to the approval of the Contracting Officer. Unless otherwise provided by the Request for Proposal, the contractor shall furnish all materials and items required for the complete structure, and in addition shall furnish nuts, bolts, washers, and other hardware in an amount 10% in excess of the quantity required for erection.

3.4.1 Structural Steel Plate, Shapes, and Bars: Structural steel plates, shapes, and bars shall conform to ASTM Specification A-36.

3.4.2 Strip Steel: Strip steel shall conform to ASTM Specification A-570 of the appropriate grade.

3.4.3 High-Strength Bolts, Including Nuts and Washers: High strength bolts, nuts, and washers shall conform to ASTM Specification A-325.

3.4.4 Bolts and Nuts, Other Than High Strength: Bolts and nuts other than high strength shall conform to ASTM Specification A-307, Grade A.

3.4.5 Plain Washers, Other Than Those in Contact with High-Strength Bolts, Heads, and Nuts:

Plain washers shall conform to ANSI Standard B 18.22.1, Type B.

3.4.6 Locknuts: A jam nut shall be used on each bolt beneath the full nut. Self-locking nuts intended for use on exterior bolted connections with any associated lock washers may be submitted for approval as a substitute for the regular nut and jam nut.

(a) Bar type. Federal Specification RR-G-661.

(b) Expanded Metal Type. Military Specifications MIL-M-17194.

3.5 Fabrication - Fabrication shall be in accordance with the A1SC Specification. Members shall have no sharp edges which will be hazardous during handling or other irregularities which will interfere with erection. The manufacturer shall be responsible for corrections of all fabrication errors and for correct fitting of the fabricated members.

Note: Final tower design submittal shall be approved by the FAA prior commencing fabrication

3.5.1 Marking: Each Separate member, except bolts, washer and similar items shall be clearly marked by stamping into the steel in the mark shown in the erection drawings. Marks shall be a minimum of 1/2 in. high. All like parts shall be marked in the same relative position. Marks shall be stamped into the steel before galvanizing and shall be clearly visible in the erected structure.

3.5.2 Galvanizing: All ferrous parts shall be hot dip galvanized after fabrication in conformance with ASTM Specification A-123 and A-385. Hardware (nuts, bolts, washers and other minor items) shall be galvanized by the hot dip method in conformance with A-153. The interior of any pipe used shall be galvanized. Anchor bolts shall be galvanized only in the area which will extend above the concrete foundation.

3.5.3 Antenna Mounting Brackets: Eight antenna pipe mounts shall be furnished with each tower. Bracket details shall be as shown on the attached drawing, ENCLOSURE (1) CDC-D-

RTR-S001, RTR Antenna Towers. Alternate support arm designs must be approved in writing by the contracting officer. Retractable support arms or fixed supports adequate for mounting eight antennas with a minimum 8 ft. separation and accessible from the platform shall be furnished with each tower.

4. QUALITY ASSURANCE PROVISIONS

4.1 Quality Control - Quality Control shall be in accordance with the American Institute of

Steel Construction Specifications. Unless otherwise specified in the specification or in the contract, all tests and inspections to determine compliance with the requirements of the contract specifications shall be made by the contractor and shall be subject to Government inspection.

The Project Engineer and Contracting Officer shall be notified by the Contractor 10 days prior to shipment of required tower to allow the Government representative to inspect tower to be shipped.

5. PREPARATION FOR DELIVERY

5.1 Preparation for Delivery - The complete system shall be packed and insured by the carrier and provide safe delivery at destination in containers complying with rules and regulations applicable to the mode of transportation. The packaged system shall be marked with the address to which it is being shipped to and shall include the contract number. Inventory sheet of tower and components shall be included with shipment.

6. OFF-LOADING AT SITE (DESTINATION)

6.1 Offloading at Site (Destination) - The Government does not have loading/unloading capabilities at the Cedar City RTR site. Therefore, the manufacturer shall arrange for and provide off-loading service at this destination. The off-loading equipment shall be provided in the proposal. If off-loading is NOT included, the FAA will reject the proposal.

** The tower will be offloaded inside an FAA secure area and will require an FAA Escort to the actual location **

7. DELIVERABLE DOCUMENTS:

7.1 Foundation Design, hard copies (3) each draft and final.

7.2 Tower Design, hard copies (3) each draft and final.

7.3 Tower Erection Plan, hard copies (3) each draft and final.

7.4 Deliver (3) bound and indexed reports of Tower, Foundation, and Erection plans; and (2) CD or flash-drives (or Electronic Copy, via e-mail if deemed acceptable by the FAA), each with a complete set of report and attachment files in both Microsoft Word .doc and .PDF format.

Delivered drawings, specifications, notes, reports, documents and other work shall become the property of the FAA.

Document delivery address and point of contact for technical information:

Maximo Flores, Project Engineer

Federal Aviation Administration

1601 Lind Ave. SW

Renton, WA 98057

425-227-1136

Maximo.Flores@faa.gov

Tower delivery address and project site

FAA Cedar City ARSR (RTR)

Blowhard Mountain

Cedar City, UT

Call 24 hours prior to towers shipment delivery:

FAA Project Engineer - Maximo Flores @ 425-227-1136

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