Attachment 3_HL-93 Cattle Guard design_1 page.pdf
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- Solicitation number
- 1240LP26Q0160
- Issued by
-
Department of Agriculture Forest Service
About this file
This is a standard technical specification document for cattle guard construction and installation. The specification establishes design requirements for cattle guards used in roadway applications, including detailed specifications for materials, dimensions, structural components, and construction methods.
The cattle guard design accommodates AASHTO HL-93 loading standards and features two standard grid unit types: a 6-foot grid (Type A) and an 8-foot grid (Type B). Key structural components include W8x18 steel beams, #4 reinforcing bars with 2-inch minimum concrete cover, ASCE 40 crane rail or acceptable alternate sections conforming to ASTM A500 Grade B or ASTM A618 Grade 2, and either wood or angle iron wing guards. Material requirements specify treated timber conforming to AASHTO M168 with chromated copper arsenate treatment per AASHTO M133, structural steel conforming to AASHTO ASTM A36, aluminum alloy 6061-T6 or 6063-T6 for tubing components, and galvanized hardware per AASHTO M111. All welds are continuous quarter-inch fillet shop welds. The specification includes provisions for concrete finishing with chamfered edges and Class 1 finish, drain pipe installation where required, object markers mounted at minimum 48-inch height, and shop-applied coating using SAE-AMS-STD-595 Gray 36231 as top coat. Additional requirements address wider cattle guards exceeding 16 feet and reference optional precast foundation details in related standards.
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Text version
6" min.
drain pipe
Object marker each corner. See Note 10
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1/1
Pay Limits, cattle guard
Nominal width of cattle guard as shown in the bid schedule
Slope to drain
Standard grid unit types (See Details)
Lateral support
SECTION VIEW
-1 --1- _ 4_8' _' ---I
½" dia. X 7" hex bolt w/nut and flat washer
See Detail B
30" treated
Toenail with 16d galvanized nails
2"x8" X 96"
Treated timber sill (S4S)
DETAIL A DETAIL B
6" X 6" X 96" treated timber post (S4S) See Detail D
2" x6" x84" treated timber (S4S)
�5?',, DETAIL C
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W 8 x 18 beams timber braces (S4S) �d---1,�.,, L 2" X 2" X ¼" X 74"
I\ L 3" X 3" X fs" guard angles
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1 0d galvanized nails
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2"x6"x 72" treated timber (S4S)
� Timber sill V
/ [1/ � [1/
0\ i
¾" dia. x 6" hex bolt w/nut and flat washer
6" X 6" X 96" fs" dia. x 7" hex bolt w/nut and flat washer
DETAIL D
treated timber post (S4S)
2" X 2" X ¼" X 87"
Rails� II f-: WOOD WING GUARD ANGLE IRON WING GUARD
1\1 �
[2J / End support
� (See Detail) e.
12" thru 42"
[2J 0\ t
'-- L 3" X 3" X fs" at 24" increments guard angles
PLAN
71¼" 95¼"
¾" ....., • o:i e.
20" 20" 21" 21" 6" 6"
Grid Type A Grid Type B 6'-0" grid 8'-0" grid
STANDARD GRID UNIT TYPES
4" min.
L 3" X 3" xfs" guard angle
L 1" X 1" X 1/s" (typ.) welded to ½" x 8" stud
Timber sill-use only with wood wing guard Al Bars A4 Bars
A2 tie Bars ( equal spacing)
A3 tie Bars (10" centers)
12" 24"
12" t> t>
I', 1\1 �
¾" x 6" hex bolt w/flat washer and nut (2 each/base plate)
12" for ASCE 40 rail 11½" for type I & II rail
7" x8" x¾" elastomeric bearing pad under W8 x 18. Bond pad to concrete (typ.)
See Detail F
2" OD x 1/s" aluminum tubing
1 '¼ ., , . [, 4 max. 4¼" max.
3;; min.
END SUPPORT DETAIL
7 � r1
��x L rn �rr-r ½6"
11½:I 11½3/j ltf Face of end support
ASCE 40 CRANE RAIL TYPE I TYPE II
L 3" X 3" xfs" ½6" dia. holes at 48"± centers in vertical leg only. Field saw cut vertical leg only to provide for crown
(#4 Reinforcing Bars)
Space ½" anchors at 12" centers alternating 6" leg and 8" leg anchors. Weld to angle with full penetration butt weld. Galvanize each assembly after fabrication
3" radius hook -¾" x 16" steel rod threaded w/nut and flat washer
DETAIL E
Base plate 10" X 5" x¼"
DETAIL F
6" x 6" x 96" treated timber post (S4S) or approved alternate
ACCEPTABLE ALTERNATE RAIL GUARD ANGLE DETAIL
(4 required per cattle guard)
ALUMINUM TUBING WING GUARD
NO SCALE
NOTE:
1. LOADING: AASHTO HL-93.
2. CONCRETE: Chamfer exposed edges¾" unless otherwise shown. Give all concrete surfaces a Class 1 finish.
3. STRUCTURAL STEEL: Provide rails conforming to the requirements for ASCE 40 crane rail. Provide structural steel for alternate sections conforming to ASTM A 500, Grade B, Copper Steel or ASTM A 618, Grade 2. If the steel does not contain a minimum of 0.2 percent copper, galvanize the alternate sections. All other structural steel conforms to AASHTO ASTM A36 and is coated.
4. Provide 2" minimum concrete cover to the face of any bar unless otherwise shown. All bars are #4.
5. All welds are continuous ¼" fillet shop welds. Weld rail or alternate sections on both sides to the W 8 x 18 beams at each intersection. Weld according to Section 555.
6. Use aluminum alloy 6061-T6 or 6063-T6 for aluminum tubing.
7. Provide timber conforming to AASHTO M 168. Treat timber with chromated copper arsenate according to
AASHTO M 133.
8. Galvanize all hardware according to AASHTO M 111.
9. Construct the cattle guard to conform with the finished roadway grade and template.
10. Mount object markers on posts with a minimum height of 48 inches, measured from the bottom of the object marker to the elevation of the nearest edge of the traveled way.
11. Install drain pipe as shown where required. Include drain pipe with cattle guard unless otherwise shown.
12. Unless otherwise shown in the special contract requirements, shop apply coating according to Section
563. Use SAE-AMS-STD-595, Gray, 36231 for the top coat. Repair any damage to the coating installation.
13. Install channels and wood blocking on cattle guards wider than 16 feet to maintain grate spacing as shown on Standard 619-2.
14. See Standard 619-3 for optional precast foundation details.
CATTLE GUARD
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| Proj-Num: |
| 619-1: |
| NPS: |
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