Attachment 2 - Bridge Sign Specifications.pdf

Beard’s Mtn. Trail Bridge 1 of 7 SPECIFICATIONS Deck & Handrail Replacement

SPECIFICATIONS

FOR

DECK AND HANDRAIL REPLACEMENT

OF

BEARD’S MOUNTAIN TRAIL BRIDGE #459-0.1

Nov. 3, 2009

Beard’s Mtn. Trail Bridge 2 of 7 SPECIFICATIONS

I GENERAL REQUIREMENTS

A. Intent of Contract:

The intent of this contract is the complete replacement of deck and handrail on Beard’s Mountain Trail

Bridge, #459-0.10 on Forest Service trail (FTR) #459, as shown on the drawings and described in these specifications. Unless otherwise noted, the contractor shall provide all labor, equipment, tools, transportation, and materials, and shall perform all work required to complete the project in reasonably close conformity with the drawings and specifications.

B. Use of Existing Road:

The contractor is authorized to use the existing Forest Service road, FSR #260, for all activities necessary for completion of this project, when such use will not cause damage to the existing road or National Forest resources and when such use can be accommodated safely.

Additional access is available to the south end of the bridge only, via a low standard road from the trailhead parking lot. This road is approximately 700’ in length. The contractor may improve this road for access as needed and as approved by the engineer. The contractor shall keep this existing low standard road closed to public traffic during construction with the existing gate at the parking lot.

All damage to the existing roads caused by the contractor’s operation shall be repaired by the contractor at his expense.

C. Project Schedule:

At least 10 days prior to beginning work, the contractor shall submit to the engineer for approval a schedule for his work and method of operation.

D. Bridge Closure:

The trail bridge shall be closed to public use during the life of the contract. The contractor shall physically close the bridge during all periods of inactive work (ie. evenings, weedends, holidays, etc.).

Physical closure shall be by means of a barrier across the opening of each tower that cannot be easily removed or crossed. In addition a “BRIDGE CLOSED FOR REPAIR” sign shall be attached to each barrier. The method of closure and specific type of barrier shall be approved by the engineer.

E. Measurement and Payment:

This contract will be measured and paid for as one complete unit of work (lump sum) as required by or described in the contract, including necessary materials, equipment, and labor to complete the job.

No measurement of quantities will be made.

F. Quality Control:

The contractor shall certify that the quality and quantity of construction conforms to the drawings, specifications, and requirements of the contract. The contractor shall furnish certificates executed by the manufacturer, supplier, or vendor, stipulating that all offsite produced materials incorporated into the work meet the applicable requirements shown on the drawings or stated in the specifications.

G. Protection and Safety:

The contractor is responsible to protect from injury all employees and visitors to the job site.

Beard’s Mtn. Trail Bridge 3 of 7 SPECIFICATIONS

H. Existing Facilities:

There is no telephone, electric, sanitary or water service at the site. The contractor shall be responsible for providing all temporary facilities required for the duration of the project.

I. Other Contracts:

Another contract for stream bank protection adjacent to the south end of the bridge may be ongoing during this contract. The contractor shall fully cooperate with the other contractor and shall not interfere with the performance of the work by the other contractor.

J. Project Clean-up and Closeout:

During construction, the contractor shall keep the project site free from accumulation of trash. Trash shall be disposed of daily off National Forest land.

II. SIGN INSTALLATION

A. This work shall consist of furnishing and installing signs, panels, posts, and hardware. Work also includes removing the sign and all components upon completion of the project.

B. Sign Posts. Sign posts shall be wood, no. 2 grade southern pine. Posts shall be treated with a water-borne preservative ACA, ACZA, or CCA according to AWPA Standard C14, except the minimum preservative retention is 0.40 pounds per cubic foot. Sign posts shall be erected plumb and in accordance with the details shown on the drawings.

C. Sign Panels. Sign panels shall be fabricated from plywood or aluminum and shall be fabricated in accordance with details shown on Attachments A, B, C, and D, contained within these specifications.

Cut panels to size and shape and drill or punch all holes prior to final surface preparation and application of reflective sheeting. Make panels flat and free of buckles, warp, dents, cockles, burrs, and all other defects. The overall width of the sign panels shall be 42 inches. Mount sign panels with the legend horizontal. Where multiple panels adjoin, limit the gap between panels to 1/16 inch.

For each sign panel use at least one anti-theft fastener.

1. Plywood panels shall be fabricated from exterior type B-B high density overlay plywood or better conforming to NIST specification PS-1 for construction and industrial plywood. Use ½-inch thick plywood for sign panels with a facial area 4 square feet or less and the horizontal dimension no greater than the vertical dimension. Use ¾-inch thick plywood for larger panels. Abrade, clean, and degrease the face of the plywood panel according to methods recommended by the manufacturer of the retroreflective sheeting. Treat the edges of the plywood panels with an approved edge sealant. Apply protective overlay film and top edge film as required and according to manufacturer’s recommendations.

2. Aluminum panels shall conform to ASTM B-209, alloy 6061-T6 or 5052-H38. For extruded aluminum panels furnish panels conforming to ASTM B-221, aluminum alloy 6063-T6. Fabricate panels that are 30-inches by 30-inches or smaller from 0.08-inch thick sheets. Fabricate larger panels from 0.125-inch thick sheets. The blanks shall be free from laminations, blisters, open seams, pits, holes, or other defects that may affect their appearance or use. The thickness shall be uniform and the blank commercially flat. Perform shearing, cutting, and punching before preparing the blanks for application of reflective material. Clean, degrease, and properly prepare the panels according to methods recommended by the sheeting manufacturer. Conversion coatings shall conform to ASTM B-921 or ASTM B-449.

Beard’s Mtn. Trail Bridge 4 of 7 SPECIFICATIONS

D. Retroreflective Sheeting. Retroreflective sheeting shall conform to ASTM D-4956. For reboundable retroreflective sheeting, conform to ASTM D-4956 including Supplemental Requirement S2, Reboundable Sheeting Requirements. When an adhesive is used, use ASTM D-4956, backing class 1, 2, or 3.

E. Letters, Numerals, Arrows, Symbols, and Borders. For letters, numerals, arrows, symbols, and borders, colors shall be as shown on Attachments A, B, C, and D to these specifications and shall conform to the requirements for retroreflective sheeting. Form letters, numerals, and other units to provide a continuous stroke width with smooth edges. Make the surface flat and free of warp, blisters, wrinkles, burrs, and splinters. Conform with one of the following:

1. Type L-1 (screen process). Apply letters, numerals, arrows, symbols, and borders on the retroreflective sheeting or opaque background of the sign by direct or reverse screen process.

Apply messages and borders of a color darker than the background to the paint or the retroreflective sheeting by direct process. Produce messages and borders of a color lighter than sign background by the reverse screen process. Use opaque or transparent colors, inks, and paints in the screen process of the type and quality recommended by the retroreflective sheeting manufacturer.

Perform the screening in a manner that results in a uniform color and tone, with sharply defined edges of legends and borders, and without blemishes on the sign background that will affect intended use. Air dry or bake the signs after screening according to manufacturer’s recommendations to provide a smooth hard finish. Any signs with blisters or other blemishes will be rejected.

2. Type L-3 (direct applied characters). Cut letters, numerals, symbols, borders, and other features of the sign message from the type and color of the retroreflective sheeting specified, and apply to the sign background’s retroreflective sheeting according to the retroreflective sheeting manufacturer’s instructions. For the retroreflective sheeting minimum coefficient of retroreflection, conform to AASHTO M 268.

F. Hardware. For lag screws, washers, clip angles, wood screws, shear plates, U-bolts, clamps, bolts, nuts, and other fasteners, use galvanized steel or aluminum alloy. Galvanize steel hardware according to AASHTO M 232. For high-strength bolts, nuts, and washers, conform to either AASHTO M 164 or M 253. For aluminum alloy bolts, nuts, and washers, conform to American standard heavy hexagon ANSI B18.2. For threads, conform to American standard coarse series, class 2 fit, ANSI specification B1.1. For each sign panel use at least one anti-theft fastener.

G. Protective Overlay Film and Edge Film. Protective overlay film will be a high performance flouropolymer film such as 3M Scotchlite Premium Protective Overlay Film Series 1160 or approved equal. Edge film will be a pressure-sensitive, premium-quality, clear, ultraviolet-resistant, 3 inches wide vinyl film.

III. TIMBER CONSTRUCTION

A. This work includes furnishing and constructing all wooden members for the project. Work also includes furnishing and installing all nails, bolts, screws, nuts, miscellaneous steel components, welded wire mesh, and other hardware, shown on the drawings.

B. Materials

1. Lumber and posts shall be southern pine grade no. 2 or better. Finish for all lumber shall be S4S, except S1S2E for all 3x6 decking members.

Beard’s Mtn. Trail Bridge 5 of 7 SPECIFICATIONS

2. Machine and carriage bolts and threaded rods shall meet the requirements of ASTM A307.

Machine bolts shall have square or hexagonal heads and nuts.

3. All bolts, washers, nuts, nails, rods, and screws shall be hot dipped galvanized in accordance with AASHTO M232. Other methods of corrosion protection for screws may be used when certified by the contractor to be equally effective and when approved by the engineer.

4. All structural steel shapes and plates shall be structural steel meeting the requirements of

AASHTO M 183. Structural steel components shall be hot dipped galvanized in accordance with AASHTO M 111 after fabrication.

5. All lumber shall be treated with CCA (0.4 pcf minimum retention) in accordance with AASHTO M

133. .

6. Welded wire mesh shall be 2”x2”- no. 12 gauge steel wire, hot dipped galvanized after fabrication according to ASTM A-123. The wire mesh may be in a roll or in panels to fit post spacing.

7. The contractor shall furnish the following compliance certificates to the engineer:

a. Verification of compliance with grading rules and species of timber and lumber.

b. Certification of preservative, penetration in inches, and retention in pounds per cubic foot either by a qualified inspection and testing agency or by supplier certification if each piece is stamped or branded with the AWPB quality mark.

C. Execution

1. All lumber and posts shall be cut and framed so all joints will have even bearing over the entire contact surface. No shimming shall be done in making joints, and all joints shall be closed.

2. Set structural members level, plumb, and true to line. Discard pieces with defects that would lower required strength or result in unacceptable appearance of exposed members.

3. Nails and screws shall be driven to set the heads flush with the wood surface.

4. Holes for bolts shall be bored with a bit 1/16 inch greater than the bolt size. Holes for lag screws shall have the same diameter and depth as the shank of the screw, plus a lead hole for the threaded portion with the diameter approximately 75 percent of the shank diameter.

5. Before driving bolts or pins, all holes bored after treatment shall be field treated as specified below. All holes drilled but not used shall be plugged with treated plugs.

6. Washers shall be placed under all bolt heads and nuts in contact with wooden members. All nuts shall be finally tightened to provide proper bearing. After being finally tightened, all nuts shall be burred effectively with a pointing tool to prevent loosening.

7. All field cuts, holes, or notches in lumber and posts shall be treated with two coats of copper napthanate solution in accordance with AWPA specification M4.

8. The welded wire mesh shall be stretched and attached to provide a firm support without waves or wrinkles. All joints of the wire mesh shall be covered with 1x4 lumber as shown on the drawings.

9. All miscellaneous steel components shall be fabricated in accordance with details shown on the drawings. All welds shall be ground smooth. All welded corners shall be mitered. All ends of cut metal shall be ground so that there are no sharp edges. Finished steel members shall be true to line and free from twists, bends, and open joints.

Beard’s Mtn. Trail Bridge 6 of 7 SPECIFICATIONS

10. Steel components shall be accurately assembled as per the drawings. Bolted parts shall fit solidly together when assembled.

IV. CONCRETE

A. This work includes furnishing and placing all concrete for the bottom pad of the steps at the north end of the bridge

B. All Portland cement concrete shall have a minimum compressive strength of 3000 psi at 28 days, cast-in-place. The slump shall be 3 to 5 inches. Concrete may be provided as a preproportioned, blended, and bagged mix meeting the requirements of ASTM C387 and mixed at the jobsite in accordance with the manufacturer’s recommendations.

1. All concrete shall be placed within 1 ½ hours from the time of mixing. No concrete shall be placed after it has started its initial set or has reached a temperature above 90° F.

2. Concrete shall be placed in a manner to avoid segregation of the mixture.

3. Mechanical vibrators or hand rodding shall be used for consolidation of concrete within 15 minutes after placement.

4. Exposed concrete shall be struck off to produce a uniform surface. Surface shall have a light broom finish. Exposed corners shall be treated with ½” edging tool.

5. Finish grading around the concrete shall be as directed by the engineer.

V. WIRE ROPE CONSTRUCTION

A. This work includes furnishing and constructing all wire rope assemblies including all accessory hardware. Also included is adjusting all existing and new wire rope rigging as described in the drawings and specifications.

B. Materials.

1. The suspender cable shall be 5/16” diameter, galvanized, 6x19 IWRC wire rope with regular right lay. The wire rope shall be produced from extra improved plow steel (EIP) and shall have a minimum breaking strength of 10,000 pounds. The contractor shall field verify each suspender length for proper fit in accordance with the drawings.

2. Wire rope clips shall be galvanized forged steel meeting the requirements of Federal

Specification FF-C-450 Type I, Class I.

3. The weldless end links shall be hot dipped galvanized with a minimum breaking strength of 45,000 pounds.

4. The open spelter sockets shall be grooved, galvanized, forged steel meeting the requirements of

Federal Specification RR-S-550D Type A.

5. The contractor shall provide certification to the engineer from the manufacturer that all wire rope and accessory hardware meets the requirements of these specifications.

Beard’s Mtn. Trail Bridge 7 of 7 SPECIFICATIONS

1. Install all wire rope and accessory hardware as shown on the drawings and as recommended by the manufacturer.

2. Following installation of all wire rope assemblies, the contractor shall adjust all new and existing wire rope rigging on the bridge as directed by the engineer so that the weight on all suspender cables is balanced, the deck is level transversely, and there is approximately a 1 foot camber in the bridge deck longitudinally.

3. The contractor shall apply a heavy duty axle grease to the main cable and cable support at the top of each tower column. Grease shall be applied on the surface and underneath the cable.

The contractor’s method of lifting the cable shall be approved by the engineer.