616.01 616-1 SECTION 616 SIPHONS DESCRIPTION
616.01 This work consists of the construction of invert siphons per these specifications and in
conformity with the lines, grades and details shown on the plans or established. MATERIALS
616.02 Concrete Pipe. Concrete pipe shall conform to the requirements of subsection 706.02
except that pipe and gaskets shall be of a type that will ensure a watertight structure. Joints shall be self -centering. Gaskets shall meet the requirements of subsection 705.03.
616.03 Trash Guards. Steel shall conform to the requirements of subsection 712.06 and to the
details shown on the plans. Trash guards shall be given one shop coat of primer and two field coats of aluminum paint in conformity with Section 509.
616.04 Drain Valves and Valve Boxes. Drain valves shall be gate type with flanged iron body,
brass trim and brass fittings. Size will be as designated on the plans. Valve boxes shall be the adjustable cast iron type with a 5 1/2-inch minimum inside diameter. Drain valves and valve boxes shall be approved before use.
616.05 Drainpipe . Pipe for the drain shall conform to Section 605. Concrete shall conform to
Section 601 and reinforcing steel to Section 602. The pipe attached to the siphon and leading to the drain valve may be non -perforated corrugated steel pipe conforming to AASHTO M 36 or of standard galvanized pipe conforming to the requirements of ASTM A53 (Schedule 40). This pipe, when attached to steel siphon pipe, shall be bituminous dipped along with the siphon pipe. Flanges for attaching the drain valve may be galvanized or asphalt dipped. Any damaged spelter shall be repaired per subsection 707.09 both inside and outside the pipe. CONSTRUCTION REQUIREMENTS
616.06 Siphon pipe including drains shall be installed per the requirements of Section 603.
Siphons shall show no leakage when filled with water and allowed to stand full for 24 hours. This test shall be performed before backfilling. METHOD OF MEASUREMENT
616.07 Siphon pipe, of the designated type, will not be measured but will be the net length of
pipe called for on the plans, except when field changes are ordered or when there are errors on the plans. In case of exceptions, the quantity to be measured shall be t he actual net length of conduit measured along the bottom centerline of the installed pipe. Trash guards, drain valves and valve boxes will be measured by the number installed and accepted. Drainpipe will be measured and paid for per Section 605. Concre te will be measured and paid for per Section 601. Reinforcing steel will be measured and paid for per Section 602. Structure excavation and structure backfill will be measured and paid for per Section 206. Drain valves shall include the pipe for connecting the valve to the siphon, together with all necessary fittings and gaskets used. 616.08 616-2 BASIS OF PAYMENT
616.08 The accepted quantities will be paid for at the contract unit price for each of the
pay items listed below that appear in the bid schedule. Payment will be made under: Pay Item Pay Unit _____Inch Concrete Siphon Pipe Linear Foot _____Inch Trash Guard Each _____Inch Valve and Valve Box Each 618.01 618-1 Section 802 SECTION 618 PRESTRESSED CONCRETE DESCRIPTION
618.01 This work consists of fabricating, furnishing, and installing prestressed concrete
members per the requirements of the Contract. This work includes the furnishing and installation of all appurtenant items necessary for the particular prestressing systems to be used, including but not limited to ducts, anchorage assemblies, and grout used for pressure grouting ducts. For cast -in-place prestressed concrete the term "member" as used shall be considered to mean the concrete that is to be prestressed. The term "tendon" as used shall be considered to mean the prestressing steel within a duct. Both temporary and permanent post- tensioning shall comply with the requirements of this section. The term temporary post -tensioning refers to the post- tensioning required to control stresses during handling and erection of precast elements. MATERIALS
618.02 Materials shall conform to the following:
Anchorage devices shall meet the requirements of subsection 714.02. Prestressing steel shall meet the requirements of subsection 714.01. Elastomeric bearing pads shall meet the requirements of subsection 512. All reinforcing and embedment item supports, bolsters, chairs, and spacers shall be CDOT approved. These items shall be plastic, rubber, or epoxy coated at all areas that will contact external concrete surfaces, unless otherwise shown on the plans.
a.Prepackaged Grout for Post -tensioned Ducts.
1.Water. The water used in the grout shall conform to subsection 712.01.
2.Grout. The grout shall meet the requirements of subsection 618.09(b).
b.Steel and Metal for Prestress Members. All steel and metal products incorporated into the work shall meet the requirements of Section 106. The Contractor/Fabricator shall keep Certified Mill Test Reports (CMTRs ) on file for all steel and metal products used and shall furnish copies of CMTRs when requested. Galvanizing and metallizing of steel products shall be done per the product applicable ASTM method. The product shall be galvanized after welding and fabrication is complete. Minor repair of galvanizing shall be brush coated with an approved zinc- rich compound that is acceptable to the QA Representative. Materials and fabrication procedures shall conform to ASTM or ANSI / AWS requirements. The materials and work shall conform to the following requirements and specifications, unless
Source: Colorado Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 697–698 of 943.