Radio Specs

ERIE COUNTY, NY PUBLIC SAFETY PAGING NETWORK RFP 2/04/2005

L. Robert Kimball & Associates Appendix G Page 1 of 10 Project # 04-1600-0064 Communication Towers

Appendix G - COMMUNICATION TOWERS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions, apply to this Section.

1.2 SUMMARY

A. This Section is for complete, self-supporting or guyed, steel communications towers. This includes foundation and tower design, procurement and delivery to site, construction, erection and inspection, of tower and related equipment as described herein and on the project drawings.

B. Related Sections:

1. Site Preparation 2. Grounding and Bonding 3. Shelters

C. The installation of antenna systems and coaxial cables on the tower is not part of this specification.

1.3 DEFINITIONS

A. Reference SECTION 17571 of this RFP.

1.4 SUBMITTALS

A. Reference SECTION 17571 requirements and additional requirements below.

B. The Vendor shall provide, for Owner review and approval, prior to commencement of the work:

1. Complete and detailed drawings of the structure and its foundation sealed by a Professional Engineer, Registered in the State of New York and competent in civil and structural design. By submittal and seal, vendor’s submittal shall attest that the design is in full compliance with the mechanical, structural, and electrical parameters established by these specifications.

2. Attachment loading calculations.



C. Upon completion of the work, the Vendor shall provide to the Owner:

1. Two complete sets of all final design and as-built drawings, ANSI C size or larger.

2. CD-ROM with all design and as-built drawing files in both AutoCad 2000 format and Adobe Acrobat (.pdf) format.

3. Final inspection and testing report.

1.5 QUALITY ASSURANCE


B. Source Limitations: Obtain all tower components from the same manufacturer.

C. Comply with standards

1. ANSI/EIA STANDARD 222 latest revision.

2. Federal Aviation Administration (FAA), Advisory Circular; AC 70/7460-1K or latest revision

3. Comply with all Federal, State and local codes and regulations.

D. The Vendor shall assume total responsibility for project design, work, licenses and liability insurance of any required items for himself and any required sub vendors. This is to include all shipping, receiving and all site work required to install the tower

1.6 DELIVERY, STORAGE AND HANDLING

A. Reference SECTION 17571 requirements.

B. Tower sections and components will be covered with tarp during winter transportation. This is to prevent road salt and chemical spray from damaging tower steel surface finish.

1.7 COORDINATION


B. Coordinate Work of this Section with other Sections of this RFP.



C. Should the Contractor, in the process of excavation for the foundation, find a condition that makes use of the proposed foundation unsuitable, the Contractor shall do the following:

1. Notify the Project Director or designee.

2. Provide drawings and specifications for a revised foundation as designed by the Contractor’s certified engineer.

3. Provide a written quotation of the cost for the revised foundation.

D. Upon receipt of the notice, drawings, specifications and price quote the Owner may do any or all of the following:

1. Issue a change order reflecting the revised cost and authorize the Contractor to proceed with the work.

2. Based on the change order pricing, owner may elect to solicit competitive bids for the foundation using the drawings and specifications provided by the Contractor's certified engineer. This action may result in another contractor doing the foundation work. However, this shall not have an adverse affect on the warranty of the tower or the foundation.

3. Any reasonable amount of time lost due to redesign and acquisition of the revised tower foundation will not be charged against the time allocated for completion.

E. Prior to erecting steel on the foundation, the Contractor will provide to the Project Director a sample of each truck load of concrete that has been tested for compliance with the foundation specifications set forth by the tower engineer. Written reports certifying the strength of the concrete are to accompany each test cylinder.

F. If any concrete used in the foundation does not meet specifications, the Contractor shall remove the foundation and pour one using compliant materials, at no expense to the owner.

1.8 TRAINING

A. Reference SECTION 17571 requirements as applicable and additional requirements below.

B. Special training requirements, if applicable, shall be defined in the proposal. (tower lighting controller if required)



1.9 WARRANTY

A. Reference SECTION 17571 requirements as applicable and additional requirements below.

B. Manufacturer will guarantee structural integrity of the tower for a period of not less than 20 years from the date of acceptance.

1.10 MAINTENANCE SERVICES

A. Reference Section 17571 requirements as applicable.

1.11 SPARE PARTS

A. Spare tower lamps or bulbs as applicable.

1.12 COORDINATION


PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

1. Allied Tower Company. 2. Pirod Inc. 3. Rohn Industries Inc. 4. Sabre Communications Corp. 5. Stainless Inc.

2.2 TOWER REQUIREMENTS

A. GENERAL

1. Tower: New towers shall be 180’ in height and suitable for the intended application, as well as general communications use including two way radio antennas and microwave dishes.



B. MATERIALS

1. Tower structural steel work shall be governed by the AISC Specifications, the AISC Code, and the EIA Standard. Where applicable, the EIA Standard shall supersede AISC requirements.

2. All concrete used in the foundation shall meet or exceed tower manufacturer foundation design requirements.

3. The tower should be new, unused, and shall meet the latest design and fabrications standards.

C. CONSTRUCTION

1. The self-supporting tower structure shall be designed and installed in accordance with latest ANSI/EIA STANDARD 222 and meeting other specifications as detailed in this document.

2. All tower sections shall be attached to each other by use of flange plates.

3. All welding must be done in the factory prior to the galvanizing process. Field welding is not acceptable.

4. The tower should be constructed of high-strength steel. All components and hardware being hot dip galvanized with zinc coating per EIA standards after fabrication. A zinc coating shall be permanently fused to the steel, both inside and outside, so all surfaces are protected and no painting is required for rust protection.

5. Prior to galvanize, each and every piece of steel and every weld is to be deburred and smooth finished.

D. FOUNDATION DESIGN

1. Foundation design information shall be provided by tower manufacturer based on contractor supplied borings and any other site information required by the tower manufacturer.

E. GROUNDING

1. Tower shall be properly grounded with using a minimum of 1 ground wire per tower leg. Ground rods shall be interconnected to each other and to the building counterpoise per Appendix J - Grounding and Bonding, project drawings, and manufacturer’s recommendations. Solid, bare, tinned # 2 AWG copper wire will be used for tower grounding and earth counterpoise.

2. Tower legs will have a plate welded to each tower leg to provide an attachment point for the ground wires. The ground wires are to be exothermically welded to the tower leg grounding plates.



3. The galvanization will be removed at the point of the exothermically welded ground wire attachment. The galvanization will then be repaired by ether the hot stick (galvo bar) method or by spraying with at least 2 coats of a zinc rich paint such as “Cold Galv”.

4. Lightning ground rod installed at very top of tower to extend at least 2 feet above top of tower or lighting fixture.

F. TOWER LOADING

1. The structure shall be designed and installed to withstand a minimum of 100 MPH sustained winds at ten meters (32.8 feet) above with a coating of 1/2-inch solid radial ice or the requirements in the current ANSI/EIA STANDARD 222, whichever is greater.

2. The tower and foundation shall be designed to support all initial attachments as identified by the Vendor(s) for this project.

3. In addition, the tower shall be designed to accommodate the following future attachments. Unless otherwise specified, for loading and design purposes the attachments shall be assumed to be at the highest point practical on the tower.

a. One 6’ solid microwave dish at top of tower b. Two 800 MHz antennas – DB806 or equivalent c. Four UHF antenna – DB636 or equivalent d. Two VHF antenna – DB516 or equivalent

G. TRANSMISSION LINE SUPPORT

1. Cable ladder – a. A vertical transmission line support system shall be provided to securely

attach the antenna transmission lines. b. Holes shall be provided in the tower support members, tower hanger

adapter plates or separate ladder structures to allow installation of snap-in cable hangers and bolt-in cable hangers at maximum 3-foot intervals. The mounting holes shall be precision punched or drilled and sufficiently separated to accommodate the snap-in or bolt-in hangers.

c. This transmission line support system shall run to the highest mounted

antenna and allow for two times the identified cable requirements in the attachment table.

2. Ice bridge – a. A horizontal transmission line ice bridge, approximately eight feet above

ground, extending from the tower cable ladder to the equipment building entry port shall be provided.



b. The ice bridge shall be installed such that it is self-supporting with its own foundations and not attached to either the tower or equipment building.

c. The ice bridge shall be exothermically bonded to the external

counterpoise ground system. All ice bridge support posts will be connected to the counterpoise per Appendix J – Grounding and Bonding. All ice bridge post connections will use exothermic welds that are installed 2 inches above the finished stone grade of the yard.

d. Multiple sections of the ice bridge shall be bonded together using two-

hole lugs, # 6 AWG stranded wire and stainless steel hardware. All connections will have a thin coating of an anti oxide compound applied to reduce oxidation.

e. Reference project drawings for Ice bridge design and installation

details.

H. CLIMBING ACCESS

1. A ladder, beginning at a point at least ten feet off the ground, shall be provided as an integral part of the tower to permit access by authorized personnel.

2. The tower shall be equipped with an OSHA approved anti-fall safety device in accordance with EIA-222. This device must not interfere with the climber's ease of reach by hand or foot from one rung of the ladder to the next, either going up or coming down. Two safety climbing belts shall be supplied with each new tower.

I. LIGHTING

1. Tower lighting shall be supplied as required by the applicable determination as issued by the FAA for this project and fully compliant with FAA AC 70/7460-1K or latest revision.

2. Unless otherwise required by the FAA, vendor shall provide a dual obstruction lighting system consisting of red lights for nighttime and high or medium intensity flashing white strobe lights for day and twilight per FAA AC 70/7460-1K, paragraph 42d or latest revision.

3. The system control circuitry shall be enclosed in galvanized rigid metallic conduit or other approved method to be in compliance with the National Electric Code as well as all local electrical codes in effect at the sites of installation. A screened vent will be installed at the bottom of the tower on the lowest point in the conduit and junction box to allow condensate moisture to be able to drain from the conduit.



4. The system control circuitry shall provide synchronization and intensity control of the obstruction lighting system and shall monitor the overall integrity of the lighting system for component failures or improper operation.

5. Form C, dry alarm output relay contacts, rated at .3A minimum @ 24VDC/125VAC, shall be provided to indicate:

a. Flash head or power failure b. Side marker lamp failure

6. The Contractor shall wire all alarms to a contractor provided Type 66 block located in the communications shelter or equipment room. All alarms shall be clearly labeled.

2.3 ACCESSORIES

A. Proposer shall identify and describe any accessories needed

PART 3 - EXECUTION

3.1 GENERAL INSTALLATION REQUIREMENTS

A. ERECTION

1. The tower steel shall be installed and erected in accordance with all manufacturer requirements, instructions, and specifications.

2. Any deviation from manufacturer requirements, instructions, and specifications shall be brought to Owners attention.

3.2 SPECIFIC INSTALLATION REQUIREMENTS


3.3 LABELING AND IDENTIFICATION


B. A permanent metal marker plate shall be affixed approximately 60” above the base of the tower, inscribed with the following information:

1. Site name 2. Installation date 3. Manufacturer and contact information



4. Model number 5. Serial number 6. Tower height in feet 7. Latitude and Longitude in degrees/minutes/seconds (NAD 83) 8. Base elevation in feet AMSL

C. FAA and FCC identification numbers, if applicable, shall be clearly labeled near the base of the tower.

D. All labeling shall be weatherproof and durable using a stamped metal plate or equivalent permanently attached to a leg or cross brace.

3.4 FIELD QUALITY CONTROL

A. Reference Section 17571 requirements.

3.5 CLEANING


3.6 FINAL TESTING AND ACCEPTANCE


B. Upon completion of the work, documentation detailing final inspection and testing shall be submitted, addressing the following:

1. Steel structure a. Vertical alignment and plumb b. All bolts tight and torqued to specification c. No damaged or missing structural members d. All surface scratches and damage to the galvanization will be repaired e. No signs of stress or vibration f. All climbing ladders, and other devices installed correctly g. Labels and tags

2. Foundation a. Concrete finish / lack of cracks / blemishes b. Grouting, if used, will have drain holes if tower uses hollow leg

construction or monopole design c. Backfilling and grading

3. Grounding a. Verify lugs and cadwelds b. Ground resistance test and record c. Ground lightning rod installed at top of tower



4. Ice Bridge a. Installed per specification

5. Lighting and controls a. Inspect conduit and wiring installation b. Verify proper lamp operation c. Verify alarm contact operation d. Verify labeling

6. Photographs a. Overall structure- from N, E, S, W b. Footers c. Grounding

3.7 TRAINING


END OF SECTION

2/3/05

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