539.02 Materials.
shall continue to apply sealant until a seal is made and there are no leaks. The Contractor shall seal the pipe without additional compensation.
h.Inspection of Pipe after Rehabilitation. Inspection of the pipeline shall again be performed by experienced personnel trained in the use of closed circuit televisi on for the inspection of pipes. The interior of the pipeline shall be carefully inspected to determine if there are areas where the liner does not adhere to the pipe wall, or if there are ruptures in the lining. A video tape and suitable log shall be submi tted to the Engineer for review after the installation of the liner. All repairs shall be made without additional compensation.
i.Clean Up. After the installation work and inspection has been completed and the work found acceptable, the Contractor shall clean up the work area. All excess material and debris not incorporated into the permanent installation shall be disposed of by the Contractor. The work area shall be left in a condition equal to or better than prior condition.
j.Warranty. All pipe rehabilitation work shall be warranted to be free from defects in materials and workmanship for a period of five years from the date of rehabilitation. The Contractor shall obtain a written warranty from the supplier of the cured -in-place liner system or P E liner pipe and submit it to the Engineer after the initial inspection and before installation begins. The warranty should include the statement that any defect that occurs during a five year period that is attributable to the liner installation or mater ials will be repaired by the supplier at no cost to the ALDOT. It should be noted in the warranty that the five year period shall begin upon final acceptance of the rehabilitated pipe.
538.04 Method of Measurement.
Roadway pipe rehabilitation will be measu red in linear feet {meters} along the flowline of the rehabilitated pipe.
538.05 Basis of Payment.
a.Unit Price Coverage. Roadway Pipe Rehabilitation, measured as noted above, will be paid for at the contract unit price, which shall be full compensation for submittals, furnishing and installing the pipe lining, cleaning and minor repair of the pipe, the warranty and for all equipment, tools, labor and incidentals necessary to complete the work. The contract price shall also include television inspection before and after liner installation.
b.Payment will be made under Item No.: 538-A inch {mm} Roadway Pipe Rehabilitation - per linear foot {meter} 538-B inch {mm} Span, inch {mm} Rise Roadway Pipe Rehabilitation - per linear foot {meter} TRENCH DRAINS
539.01 Description.
This Section shall cover the work of constructing trench drains. The drains shall be of cast -in-place concrete drains or prefabricated drainage channels encased i n cast -in-place concrete. The drains shall be constructed to form a channel for the collection and flow of stormwater. Grates shall be installed to allow water to pass into the channel and to allow vehicular traffic to move over the drains.
539.02 Materia ls.
a.Drain Channel . The minimum width and depth of the drain channel below the drain grate will be shown on the plans. The drain channel shall have a rounded bottom. Connections to structures shall not restrict the hydraulic flow of the drain channel .
539.03 Construction Requirements.
b.Drain Channel Roughness Coefficient . The drain channel shall have a smooth interior face. The roughness coefficient for the interior face of a prefabricated drain channel shall not be greater than 0.010. The interior face of a cast -in-place drainage channel shall have a Class 2 surface finish in accordance with the requirements given in Section 501.
c.Concrete . The concrete shall be Class A concrete in accordance with the requirements given in Section 501. The minimum amount of concrete around the drain channel will be shown on the plans. Concrete shall be placed in a monolithic pour between inlet structures. Construction joints will only be allowed if approved by the Engineer. If joints are allowed they shall be constructed with a waterstop and a concrete lug or keyway approved by the Engineer.
d.Grates and Frames . The grates, and the frames for supporting t he grates, shall be made from ductile iron conforming to ASTM A 536, Grade 65 -45-12 or cast iron conforming to ASTM A 48 Class 38B. The opening in the grate shall be a minimum of 60% of the open area at the top of the drain except where ADA regulations app ly as shown on the plans. The Contractor shall submit results from an independent laboratory verifying that the grates meet the requirements given in AASHTO M 306, for "Proof Load Testing". Grate retaining devices shall not obstruct the flow of water into the channel or through the channel. A grate shall fit into the frame without rocking. It shall be held in place by stainless steel tamper resistant locking devices. The Contractor shall submit results from an independent laboratory verifying that the grates will withstand a minimum repetitive pullout resistance of 200 pounds per foot {5 kN per meter} after the completion of 1,000 hours of salt spray in conformance with ASTM B 117. The grate retaining device shall withstand, without maintenance, cyclic vert ical loads of 500 pounds {2.2 kN}. Frames shall be independent of the channel and shall be anchored into the surrounding concrete by metal extensions attached to the frame at all four corners. Rails that are cast into the concrete shall be ASTM A 36 st ructural steel, post fabrication galvanized per ASTM A 123.
e.Prefabricated Drain Channel . Prefabricated drain channels shall be made from components that are anchored by the placement of concrete to encase the anchoring lugs that are integral to the cha nnel components. The physical properties of the prefabricated drain channel shall be compatible with the physical properties of the concrete. The thermal coefficient of expansion shall be similar to that of the concrete so that separation does not occur b etween the prefabricated drain channel and the encasement concrete. Prefabricated drain channels shall interlock with adjoining channels.
539.03 Construction Requirements.
a.General . The Contractor shall submit the trench drain manufacturer’s recommendat ions for installation to the Engineer prior to beginning installation. This submittal shall include a quantity listing of all materials required for the construction of the trench drain. The submittal shall be delivered to the Engineer at least ten calenda r days prior to beginning the construction of the trench drain. The Contractor shall resubmit the trench drain data if the submittal is determined to be inadequate. Construction shall not begin until the submittal is complete. A representative of the trench drain manufacturer shall be present to advise the Engineer of the adequacy of the first trench drain units that are installed. The installation of the trench drain units shall not begin until the manufacturer's representative is present at the site of installation. Connection to an existing structure may require the use of a transitional fitting and/or sections of pipe to provide a suitable connection without damage to the grate, drain and structure. Connections to structu res shall be approved by the Engineer prior to construction. When the trench drain begins or terminates without a connection to other pipes or drainage structures, the trench drain end shall be sealed or plugged with a suitable cap as shown on the plans. The seal shall provide a waterproof connection.
546.01 Description.
b.Trench Excavation. Excavation shall be kept as nearly as possible to the minimum width, depth, and length shown on the plans.
c.Drain Placement and Protection . Precast drains shall be installed to the li nes and grades shown on the plans or as directed by the Engineer. The trench slot shall be protected during installation by a removable wood strip, heavy duty tape, or other suitable material, affixed to the slot to prevent infiltration of material into t he drain. After finishing the surface, the protective covering shall be removed and any debris that entered the trench shall be removed.
c.Concrete Placement . The furnishing and placement of the concrete shall be in accordance with the requirements given in Section 501. The prefabricated trench drain components shall be supported or held in place in such a manner as to permit flow of the concrete backfill material around the drain. The concrete encasement adjacent and beneath the drain channel shall be a minimum thickness of 6 inches (150 mm}. Drain channels shall be positioned in the excavated trench so that, when finished, the surrounding concrete backfill will encase the channel. Concrete backfill shall be placed in the trench against undisturbed materi al at the sides and bottom of the trench and in a manner that will prevent floating or shifting of the trench drain components and voids in, or segregation of, the concrete. Where necessary, earth plugs shall be constructed and compacted at the ends of the planned concrete backfill to contain the concrete within the trench. Concrete shall be finished flush with adjacent surfacing. The surface of the concrete shall be textured with a broom or burlap drag to produce a durable skid- resistant surface. Under no circumstances shall any portion of the trench drain slot extend above the paving material or curb and gutter section.
539.04 Method of Measurement.
The trench drain will be measured in linear feet {meters} along the top of the drain. Connections to other structures (i.e. elbows, pipe, joints, etc.) will not be measured for payment unless shown otherwise on the plans. Excavation and backfill will not be measured for payment.
539.05 Basis of Payment.
a.Unit Price Coverage . Trench Drain will be paid for at the contract unit price, which shall be full compensation for fabricating, furnishing and installing the trench drain components. It shall also be full compensation for furnishing and installing connections to other structures, for all concrete, excavat ion, backfill, satisfactory disposal of surplus materials, and for all equipment, tools, labor, and incidentals necessary to complete the work.
b.Payment will be made under Item No .: 539-A ___ inch {mm} Trench Drain - per linear foot {meter} SECTION 546 MICRO PILES
546.01 Description.
This Section shall cover the work of constructing, furnishing, and installing micropiles as shown on the contract plans, approved working drawings, and as specified herein. The Contractor shall be responsible for furnishing all design, materials, products, accessories, tools, equipment, services, transportation, labor and supervision, and manufacturing techniques required for design, installation, and testing of micropiles and top attachments. The Contractor shall select micropile type, size, micropile top attachment, and construction methods. The Contractor shall estimate the ground to grout bond value and determine the required
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 422–423 of 934.