622.05 Pipe Railing and Miscellaneous Pip E Work
582 SECTION 622
622.01 Description
This work consists of providing and erecting pipe railing with steel and concrete posts, and miscellaneous pipe work.
622.02 Materials
Provide materials in accordance with Subsection 732.04, “Pipe Railing.” Provide two coats of aluminum paint (finish field coat) in accordance with Subsection 730.02, “Requirements for Paint Systems” for standard black steel pipe. Provide concrete posts in accordance with Section 504, “Bridge Decks, Approaches, Rails, and Parapets.” Provide reinfor cement in accordance with Subsection 723.01, “Bar Steel Reinforcement – Billet Steel.”
622.03 Equipment — Vacant
622.04 Construction Methods
A.Pipe Railing Submit Shop Drawings of the railing details to the Resident En gineer. Allow 10 days for approval. Join the pipe railing to posts with fittings. Make splices using male and female connections with dimensions no greater than the outside dimension of the pipe railing. Weld railing in accordance with Subsection 724.03, “Welding.” Secure railing posts with fittings as shown on the Plans.
B.Miscellaneous Pipe Install miscellaneous pipe for conduit and drains in concrete curbs, sidewalks, or retaining walls as shown on the Plans, or as directed by the Resident Engineer. Ensure the pipes are completely embedded in the concrete.
622.05 Method of Measuremen T
The Resident Engineer will measure the length of Pipe Railing from center to center of the end posts, not including the length of steel and concrete posts. GUARDRAIL AND END TREATMENTS 623.02 583 622.06 BASIS OF PAYMENT The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.PIPE RAILING Linear Foot [Meter]
B.MISCELLANEOUS PIPE WORK Linear Foot [Meter] Include the cost of steel and concrete posts to be included in the contract unit price for Pipe Railing . If a pay item for Miscellaneous Pipe Work does not exist, the Department will consider the cost of miscellaneous pipe work to be included in the contract unit price of other relevant pay items. SECTION 623 GUARDRAIL AND END TREATMENTS
623.01 Description
This work consists of constructing guardrail, end treatments, posts, blockouts, and ot her appurtenances. The Department defines the following types of guardrail: Beam Guardrail Steel W-Beam Single, Beam Guardrail Steel W-Beam Double, Beam Guardrail Steel Thrie Beam Single, Beam Guardrail Steel Thrie Beam Double, Beam Guardrail Steel Transition Section, Guardrail Anchor Unit, or Guardrail End Treatments (GET). Use GETs that are designed as W-Beam guardrail terminals. Provide GETs with anchors capable of supporting the rail tensile strength developed during a downstream impact and rema ining crashworthy for end-on impacts. Ensure the GETs satisfy the National Cooperative Highway Research Program (NCHRP) Report 350 for a test level 3 (TL-3) terminal and are approved for use on the National Highway System.
623.02 Materials
Provide materials in accordance with the following sections and subsections: Material: Section or Subsection: Portland Cement Concrete Class A 701 Epoxy Resin Adhesive 701.13 Reinforcing Steel 723 Requirements for Paint Systems 730.02 Guardrail Posts 732.01
623.04 Guardrail and End Treatments
584 Material: Section or Subsection: Spacer Blocks (Blockouts) 732.01 Beam Guardrail Elements 732.01 Fittings (Steel Hardware) 732.01 Reflective Sheeting for Guide Posts 733.05 Non -Shrink Grout 733.07 Ensure the GETs are manufactured with new material and assembled in accordance with the manufacturer’s standards. Provide a GET capable of flattening and bending the guardrail away from the impacting vehicle. Ensure the guardrail elements are continuous 12 -gauge sections; either one 26 ft [8.0 m] long section , or two 13 ft [4.0 m] long sections.
623.03 Equipment — Vacant
623.04 Construction Methods
A.Setting Posts for Guardrail or Barrier Posts Set posts for guardrail as shown on the Plans. Dig post holes in compacted soil. Keep the bottoms of the holes free of loose material to ensure a stable post foundation. Space the posts as shown on the Plans and set plumb with the front faces in a straight line. For curves, set posts a uniform distance from the edge of the pavement. Set the tops of the posts to the elevations shown on the Plans or as approved by the Resident Engineer. Backfill the holes with material approved by the Resident Engineer after placing the posts. Compact each layer of material to a depth no greater than 6 in [150 mm]. Ensure compact ion operations do not change the alignment of the post. Posts for guardrail may be machine driven. Fill surface depressions resulting from driving the posts. Use material similar to the in -situ material and compact.
B.Rail Elements Erect rail elements i n a smooth, continuous installation. Tighten all bolts except adjustment bolts. Provide bolts with lengths that extend beyond the nuts. If field painting rail elements, first apply a rust -inhibitive primer to correct damage to the shop coat of paint. Fi eld paint surfaces before erecting rail elements inaccessible to painting after erection. Uniformly apply the number of coats of paint required in the Contract by brush or pressure spray. Protect the following with two coats of zinc rich paint: Abraded ga lvanized surfaces with exposed base metal, The threads of fittings, and Fasteners and cut ends of bolts. GUARDRAIL AND END TREATMENTS 623.04 585 Install double -faced guardrail as shown on the Plans. Do not modify anchor -bolt holes or slots to accommodate connections in the field. Obtain Residen t Engineer approval for modifications to standard guardrail design. Ensure modifications pass Department inspection before installing.
C.Placing Metal Plate Rails and Fittings Fasten metal plate rails to the posts as shown on the Plans. Overlap the rail sections at least 6 in [150 mm] in the direction of traffic so the end of the previous plate rail covers the start of the succeeding plate rail. Use only one type of metal plate guardrail on the Project, unless otherwise shown on the Plans.
D.Guardrail A nchor Units Construct guardrail anchor units as shown on the Plans. If encountering rock harder than medium sandstone (surface outcropping, massive boulders, and ledge rock under overburden) during construction of the concrete anchor, proceed as follows:
1.For Surface Outcroppings Drill four spaced and patterned holes with 2 in [50 mm] diameters. Fill half of each rock hole with pourable epoxy grout, insert full depth anchor bolts, and stabilize them. Fill the remainder of the hole with epoxy. Expel a ir bubbles and voids from the holes.
2.For Rock with Soil Overburden 18 in [450 mm] Deep or Less Use the following steps: Drill four spaced holes for the anchor bolts. Drill four additional holes with a diameter of 2½ in [64 mm], each 12 in [300 mm] from the center of the concrete anchor and spaced 90° apart. Fill half of each outer hole with pourable epoxy grout. Insert, plumb, and stabilize one number 9 reinforcing steel bar per hole, cut to the length needed for the anchor unit. Cut the reinforcing steel bar to a length that allows insertion of at least 12 in [300 mm] into the rock and a clearance of 2 in [50 mm] above the top of the concrete anchor. Fill the remainder of the hole with epoxy and expel the bubbles. Tie the 6 × 6-W1.5 × W1.5 wire mesh to the bars after the grout dries. Spread pourable epoxy grout on the surface between the rock and concrete for positive bond. Construct the upper portion of the anchor unit as shown on the Plans.
3.For Rock Encountered Deeper Than 18 in [450 mm] Constru ct the anchor in accordance with the procedure for soil with overburden 18 in [450 mm] deep or less, and omit the four additional anchors.
623.05 Guardrail and End Treatments
586 E. Guardrail End Treatments (GET) Ensure experienced workers fabricate and install the GET as shown on the Plans and ensure the end treatment remains intact, redirects side vehicular impacts, and flattens the rail element to attenuate head -on vehicular impacts. Construct GETs with certified, crash -tested hardware. Ensure NCHRP 350 TL-3 certification for substituted hard ware and that the product appears on the Traffic Engineering Division’s Qualified Product List (QPL). Obtain the Resident Engineer's approval of substitution GET component hardware and ensure it passes Department inspection before installation.
F.Blockou ts For safety end treatments, use certified blockouts meeting the minimum requirements of NCHRP 350 TL-3. Provide a letter of certification with substitutions. Obtain the Resident Engineer’s approval of substitutions before installation. Provide certific ation of blockouts used in safety end treatments. Ensure that composite or synthetic blockouts used in safety end treatments attached to bridges or permanent concrete walls have been crash -tested and certified.
G.Guardrail Bridge Connection (GBC) Ensure experienced workers fabricate and install the GBC as shown on the Plans and ensure the bridge connection remains intact, redirects side vehicular impacts, and flattens the rail element to attenuate vehicular impacts at the approach ends of the bridge rail. Construct GBCs with approved NCHRP 350 TL -3 designs, using only certified and crash -tested hardware. Provide NCHRP 350 TL -3 certifications for substitute hardware, except for posts an blockouts, which may not be substituted without an actual crash test c ertification. Obtain the Resident Engineer’s approval of substitution GBC component hardware and ensure it passes Department inspection before installation.
623.05 Method of Measuremen T
The Resident Engineer will measure the length of guardrail from cente r to center of the supporting posts. The Resident Engineer will measure Blockouts using the length of the guardrail from the first blockout to the beginning of the next anchor unit. FENCES 624. 02 587 623.06 BASIS OF PAYMENT The Department will pay for each pay item at the contract unit price per the specified pay unit as follows: Pay Item: Pay Unit:
A.BEAM GUARDRAIL W-BEAM SINGLE Linear Foot [Meter]
B.BEAM GUARDRAIL W-BEAM DOUBLE Linear Foot [Meter]
C.BEAM GUARDRAIL THRIE -BEAM SINGLE Linear Foot [Meter]
D.BEAM GUARDRAIL THRIE -BEAM DOUBLE Linear Foot [Meter]
E.BEAM GUARDRAIL TRANSITION SECTION Each
F.GUARDRAIL ANCHOR Each
G.GUARDRAIL END TREATMENT Each
H.BLOCKOUTS Linear Foot [Meter]
I.GUARDRAIL BRIDGE CONNECTION Each SECTION 624 FENCES
624.01 Description
This work consists of constructing fence and gates. The Department defines the following styles of fence: Fence, Style WWF (Woven Wire Fence), Fence, Style SWF (Strand Wire Fence), Fence, Style CLF (Chain Link Fence), Fence, Style GDF (Glare Deflector Fence), and Fence, Metal Panel.
624.02 Materials
Provide materials in accordance with the following section and subsections: Material: Section or Subsection: Portland Cement Concre te Class A 701 Requirements for Paint Systems 730.02 Fence, Style WWF 732.06 Fence, Style SWF 732.06 Fence, Style CLF 732.07 Fence, Style GDF 732.08
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 596–600 of 935.