Published by department of transportation



Download 6.74 Mb.
Page260/288
Date08.01.2017
Size6.74 Mb.
#7448
1   ...   256   257   258   259   260   261   262   263   ...   288

82-2.03 CONSTRUCTION

82-2.03A General


Deliver sign panels to the job site with the background and legend permanently affixed to the panels.

Do not chip or bend sign panels.

Immediately replace sign panels exhibiting damage or flaws, including a significant color difference between daytime and nighttime.

Obtain authorization before repairing sign panels at the job site.

Use the following hardware to mount the type of sign panel shown:

1. Lag screws, nuts, bolts, and washers for roadside signs

2. Braces and wood block spacers for roadside signs

3. Type A-1 and Type A-2 mounting hardware for overhead laminated-panel signs

4. Type A-3 mounting hardware for overhead formed-panel signs

82-2.03B Laminated Panels


For laminated multiple-panel signs, place an H-section closure extrusion in the top channel of the lower panel before mounting the upper panel. When mounted, the bottom channel of the adjoining upper panel must fit together to enclose the H-section closure extrusion for the full length of the panel without gaps.

82-2.04 PAYMENT


The payment quantity for furnishing any type of sign panel is the area determined from the dimensions shown.

82-3 ROADSIDE SIGNS

82-3.01 GENERAL

82-3.01A Summary


Section 82-3 includes specifications for constructing roadside signs.

Roadside signs include Type N (CA), Type P (CA), and Type R (CA) marker panels.


82-3.01B Definitions


roadside sign: Traffic sign with 1 or more sign panels attached to a supporting structure consisting of 1 or 2 posts, a signal standard, or a lighting standard.

82-3.01C Submittals


Reserved

82-3.01D Quality Assurance


When delivered to the job site, treated posts must comply with the specified grading requirements and have a moisture content of not more than 25 percent when tested under ASTM D4444 with an authorized moisture meter.

82-3.02 MATERIALS

82-3.02A General


A roadside sign includes sign panels, fastening hardware, back braces, straps and saddle brackets, and frame assemblies for multiple sign panels.

82-3.02B Metal Posts


A mounting for a roadside sign to be installed on a barrier or railing must be fabricated from (1) welded or seamless steel pipe complying with ASTM A53/A53M, Grade B, and (2) structural steel complying with ASTM A36/A36M.

Bolted connections must comply with section 56-2.02D. Concrete anchorage devices must comply with section 75-3.

After fabrication, all metal parts for mounting a roadside sign must be galvanized under section 75-1.02B.

82-3.02C Wood Posts


A wood post must be the allowable grade and species for the sizes shown in the following table:

Nominal post sizea

Allowable grades and species

4 by 4 inches

Select heart redwood

No. 1 heart structural redwood, 1050f

No. 2 heart structural redwood, 900f

No. 1 structural light framing Douglas fir, free of heart center

No. 1 structural light framing Hem-Fir, free of heart center

No. 1 structural light framing Southern yellow pine, free of heart center

4 by 6 inches

Select heart grade redwood

Select heart structural grade redwood, 1100f

No. 1 heart structural redwood, 950f

No. 2 structural joists and planks, Douglas fir, free of heart center

No. 1 structural joists and planks Hem-Fir, free of heart center

No. 2 structural joists and planks Southern yellow pine

Greater than 4 by 6 inches

Select heart redwood

No. 1 heart structural redwood, 950f

No. 1 posts and timbers, also known as no. 1 structural, Douglas fir, free of heart center

Select structural posts and timbers Hem-Fir, free of heart center; and no. 1 timbers Southern yellow pine, free of heart center

aSizes shown are minimum dressed dry sizes

The posts must be graded under section 57-2.01B(2). The sweep must not exceed 0.08 foot in 10 feet.

When tested under ASTM D4444 with an authorized moisture meter, the moisture content of Douglas fir, Hem-Fir, and Southern yellow pine posts must be not more than 25 percent in the outer 1 inch at the post's midpoint before preservative treatment.

Douglas fir and Hem-Fir posts must be treated under section 57-2.01B(3) and under AWPA U1, Use Category UC4A, Commodity Specification A. Posts must be incised, and the minimum retention of preservative must comply with AWPA requirements.

82-3.02D Laminated Wood Box Posts


The Department furnishes a laminated wood box post with an attached metal cap at the top of each post.

82-3.02E Sign Panel Fastening and Mounting Hardware


Frame assemblies for multiple sign installations must be fabricated from an aluminum alloy or structural steel complying with ASTM A36/A36M. Frames fabricated from structural steel must be hot-dip galvanized after fabrication.

Back braces for a sign must be made of commercial-quality, mild steel and hot-dip galvanized after fabrication.

Straps and saddle brackets for mounting sign panels on lighting standards, sign structure posts, and traffic signal standards must be stainless steel complying with ASTM A167, Type 302B. Theft-proof bolts must be stainless steel with a chromium content of at least 17 percent and a nickel content of at least 8 percent.

Bolts, except theft-proof bolts, lag screws, metal washers, and nuts must be made of commercial-quality steel and hot-dip galvanized after fabrication. Fiber washers must be commercial quality.

Galvanizing must comply with section 75-1.02B.



Download 6.74 Mb.

Share with your friends:
1   ...   256   257   258   259   260   261   262   263   ...   288




The database is protected by copyright ©ininet.org 2024
send message

    Main page