00446.12 387 Section 00446 - Trench Drains Description
00446.00 Scope - This Work consists of constructing trench drain systems and constructing j oints
and connections to other drainage Structure s at locations shown or directed.
00446.01 Definitions :
Type 1 Trench Drain - A trench drain installation in which any part is constructed in a Traveled Way. Type 2 Trench Drain - A trench drain installation that is constructed in a paved Shoulder and paved or unpaved Multi -Use Path. Materials
00446.10 Materials - Furnish Commercial Grade Concrete meeting the requirements of
Section 00440.
00446.11 Trench Drains - Furnish trench drains from the QPL or that meet the following
requirements: • Trench drains that have smooth interior surfaces below the level of the frame, grate, and associated connections. • Trench drain sections, excluding the frame and grate, that are manufactured of m onolithic polymer concrete composed of Aggregate and polyester resin or vinylester resin that when complete, meet the following requirements: Property ASTM Test Method Value Tensile Strength (min. psi) C 307 1,500 Compressive Strength (min psi) C 579 12,000 Bending Strength (min psi) C 580 2,900 Moisture Absorption (max. %) C 140 0.5 Chemical Resistance C 267 Pass Freeze/Thaw (min. number of cycles C 666 1,600 without weight loss)
00446.12 Frames and Grates - Furnish frames and grates from the QPL or that meet the following
requirements: • One piece frames and grates for Type 1 Trench Drains meeting the requirements of AASHTO M 306, H25 loadings. Secure them to the surrounding concrete to provide a minimum pullout resistance of 500 pounds per foot of length of trench drain. • Either one-piece or removable grate type frames and grates for T ype 2 Trench Drains meeting the requirements of AASHTO M 306, H20 loadings. Provide tamper resistant locking devices for removable grates. Provide American s with Disa bilities Act certified grates that are placed within designated pedestrian paths of travel. 00446.40 388 Construction
00446.40 General - Construct trench drains according to the following:
a.Trench Work - Excavate trench and prepar e bedding according to the manufacturer's recommendations. Provide an additional minimum of 4 inches on both sides and the bottom of the trench drain system for the C ommercial Grade Concrete.
b.Line and Grade - Establish the centerline and grade control prior to the start of construction. Do not vary from established line and grade by more than 1/32 inch per inch of inside trench drain width, subject to the following limitations: The variation does not result in a level or reverse sloping invert . The variation in the invert elevation between adjoining sections of trench drain does not exceed 1/64 inch per inch of inside trench drain width.
c.Trench Drain System Installation - Install trench drain systems according to the following: • Follow the manufacturer's installation recommendations. • Locate maintenance access for Type 1 T rench Drains outside of the Traveled Way. • Securely support all channel units at the correct line and grade during the concrete pour. Texture the surface of concrete with a broom or burlap drag to produce a skid-resistant surface. Finishing and Cleaning Up
00446.70 General - Remove all debris from the finished trench drain then flush with water.
Measurement
00446.80 Measurement - The quantities of tren ch drains will be measured on the length basis.
Measurement will be from the beginning of the trench drain to the center of the receiving Structure . Payment
00446.90 Payment - The accepted quantities of trench drains will be paid for at the Contract u nit
price, per foot, for the item "Trench Drain, Type ____ ". The type of trench drain will be inserted in the blank. Payment will be payment in full for furnishing and placing all Material s, and for furnishing all Equipment , labor, and Incidental s neces sary to complete the Work as specified.
Trench Drains in other states
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 453–454 of 1,268. View official source ↗