RIPRAP 601.04 533 SECTION 601 RIPRAP
601.01 Description
This work consists of providing and placing riprap for slope protection. The Department defines the following types of riprap: Type I Plain, Type I -A Plain with Filter Blanket, Type II Special Plain, Type II -A Special Plain with Filter Blanke t, Type III Laid Up, or Type IV Grouted.
601.02 Materials
Provide the following materials in accordance with the following subsections: Material: Subsection: Portland Cement 701.02 Fine Aggregate 701.05 Filter Fabric 712.02 Stone for Riprap 713.01 Filter Blanket 713.02
601.03 Equipment — Vacant
601.04 Construction Methods
A.General Shape and dress slopes, ditches, and protected areas to the lines and grades shown on the Plans. If the Contract requires Type III or Type IV riprap, compact the base in accordance with Subsection 501.04, “Construction Methods,” before placing the riprap.
B.Filter Blanket Place the filter blanket in one or two layers, as shown on the Plans. If material is stockpiled at the job site, follow the procedures in accordance with Subsecti on 106.08, “Storage and Handling of Material. ” Uniformly spread each layer of filter blanket on the prepared base. If the blanket is damaged during placement, repair or replace before proceeding, at no additional cost to the Department. Finish the filter blanket to an even surface, free of mounds and windrows.
601.04 Riprap
534 C. Filter Fabric Place filter fabric on a slope that is uniform, smooth, and free of debris that may damage the filter fabric. Lay the material without stretching it. Overlap adjacent strips at leas t 2 ft [0.6 m] and in accordance with Subsection 602.04.D, “Filter Fabric Placement.” Support the fabric to maintain its position. The Resident Engineer must approve of the methods for fabric support and securing. Replace or repair damaged or displaced filter fabric at no additional cost to the Department. Keep the fabric wrapped in a heavy -duty covering during shipment and storage to protect the filter fabric from the following: Temperatures greater than 140 °F [60 °C], Direct sunlight, Ultraviolet rays, Mud, Dirt, Dust, and Debris. Cover or protect the filter fabric within 3 days of placement. Replace filter fabric uncovered or unprotected after 3 days, at no additional cost to the Department.
D.Types I, and II (With or Without Filter Blanket) Prepare the areas to be protected before placing the riprap, or filter blanket and riprap. Dump the plain riprap and the special plain riprap over the area shown on the Plans and grade the area to uniformly distribute the sm aller stone. Place the riprap by hand or machine to achieve the lines and thickness shown on the Plans.
E.Type III Excavate the riprap foundation below the scour line or to the elevations shown on the Plans. Obtain the Resident Engineer’s approval of th e footing excavation before placing the stone or concrete riprap. Place and work spalls into the spaces between stones. Finish the riprap surface even and tight. Remove points of stones that project beyond the finished riprap surface.
F.Type IV Excavate the riprap foundation below the scour line or to the elevations shown on the Plans. Obtain the Resident Engineer’s approval of the footing excavation before placing the stone or concrete riprap. Place the surface of the stones in contact with the protect ed slope at the angle shown on the Plans. Key the individual stones into the surrounding riprap, and lay them in close contact to break joints. Prevent earth and sand from filling the spaces between the stones. GABIONS AND REVETMENT MATTRESSES 602.01 535 Wet the stones immediately after placement. Fill the spaces between the stones with grout, working from bottom to top. Sweep the surface with a stiff broom. Do not grout the riprap at temperatures below 32 °F [0 °C]. In hot, dry weather, protect the work from the sun and keep moist for at least 3 days after grouting. Grout shall consist of one part portland cement and 3 parts fine aggregate by volume, mixed with water. The Department will allow re -tempering of grout, as long as the grout has not initially set as determined by the Engineer. 601.0 5 METHOD OF MEASUREMEN T The Resident Engineer will not include the area of laps in the measurement of Filter Fabric (Riprap) .
601.06 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.TYPE I PLAIN RIPRAP Ton [Metric Ton]
B.TYPE I PLAIN RIPRAP WITH FILTER BLANKET Ton [Metric Ton]
C.TYPE II SPECIAL PLAIN RIPRAP Ton [Metric Ton]
D.TYPE II SPECIAL PLAIN RIPRAP WITH FILTER BLANKET Ton [Metric Ton]
E.TYPE III LAID UP PLAIN RIPRAP Square Yard [Square Meter]
F.TYPE IV GROUTED RIPRAP Square Yard [Square Meter] SECTION 602 GABIONS AND REVETMENT MATTRESSES
602.01 Description
This work consists of providing and placing stone -filled wire -mesh baskets and plastic filter fabric for retaining embankments and controlling erosion. Gabion. Square or rectangular wire -mesh basket with a thickness of at least 1 ft [0.3 m], filled with hard, durable stone. Revetment Mattress. Rectangular wire -mesh basket with a maximum thickness of 1 ft [0.3 m].
Source: Oklahoma Standard Specifications for Highway Construction, 2019 Edition. Pages 547–548 of 935.