BOXES ADJUSTED TO GRADE
610.01 Description. This item shall consist of adjusting the top
elevation of existing manholes, drop inlets, or jun ction boxes according to these specifications and to the grades shown on the plans, or as directed.
610.02 Materials. New materials used in the grade adjustment
shall comply with Subsection 609.02. 443 610.03 Construction Requirements. Construction methods, as modified below, shall comply with Subsection 609.03 , except that painting of existing rings and covers or grates and frames will not be required. The existing rings and covers or grates and frames shall be removed in a manner to avoid breaking or cracking a nd cleaned of old mortar before resetting at the specified elevat ion. Structures damaged because of the Contractor's negligence shal l be repaired or replaced at no cost to the Department. If the top of the structure is to be lowered, mason ry courses shall be removed and old mortar cleaned from the remainin g top course, or concrete shall be cut on a horizontal line as di rected, to an elevation that will allow the rings or frames to be set in concrete to the specified grade. If the top of the structure is to be raised, the to p of walls shall be cleaned of old mortar, or the top of concrete walls shall be cleaned of old mortar and roughened, and the walls built up with concrete to an elevation that will allow the rings and frames t o be set to the specified grade.
610.04 Method of Measurement. Manholes, Drop Inlets, or
Junction Boxes Adjusted to Grade will be measured b y the unit.
610.05 Basis of Payment. Work completed and accepted and
measured as provided above will be paid for at the contract unit price bid each for Manholes Adjusted to Grade, Drop Inlets Adjusted to Grade, or Junction Boxes Adjusted to Gr ade, which price shall be full compensation for adjusting manh oles, drop inlets, or junction boxes; for excavation and backfill; and for all materials, labor, equipment, tools, and incidentals necessary to complete the work. Payment will be made under: Pay Item Pay Unit Manholes Adjusted to Grade Each Drop Inlets Adjusted to Grade Each Junction Boxes Adjusted to Grade Each 444 SECTION 611 PIPE UNDERDRAINS, OUTLET PROTECTORS, AND COVERS
611.01 Description. This item shall consist of constructing
underdrains using pipe, filter fabric, and granular filter material according to these specifications and in reasonably close conformity with the lines and grades shown on the plans, or as directed; and the inspection for acceptance of the underdrain system installed on the project, if included as a pay item.
611.02 Materials (a) Pipe. All corrugated metal pipe,
polyethylene tubing, and acrylonitrile butadiene st yrene (ABS) pipe shall be furnished from those sources listed on the Department’s Qualified Products List (QPL). The types of pipe f or underdrains shall comply with the following requirements:
1.Corrugated Metal Pipe for Underdrains. Corrugated Metal Pipe shall comply with Subsection 606.02(c). Pipe furnished with a nominal diameter of 6" to 8" (150 to 200 mm) shall be fabricated from metal with a thickness not less than 0.052 inch (1.32 mm).
2.Corrugated Polyethylene Tubing. The tubing shall be the heavy duty type and shall comply with AASHTO M 252. The tubing shall have a minimum pipe stiffness of 46 ps i (3.23 kg/cm 2) at 5% deflection and shall be capable of 60 perce nt vertical deflection in parallel plate loading witho ut splitting or cracking when tested in accordance with ASTM 2412.
3.Acrylonitrile Butadiene Styrene (ABS) Pipe. The pipe shall be extruded from virgin ABS complying with AS TM D2680. Fittings shall be of the same composition and have the same physical properties as the pipe and shall not restr ict flow. Corrugated polyethylene tubing shall have AASHTO M 252, Class 2 perforations. Perforations for other types of pipes shall be approximately circular and cleanly cut; shall have nominal diameters not less than 3/16" (5 mm) nor more than 3/8" (10 m m); and shall be arranged in at least two rows parallel to the axis of the pipe. 445 (b) Underdrain Outlet Protectors. Concrete shall comply with Section 802 for Class M Concrete. Reinforcing stee l shall comply with Section 804. In lieu of constructing underdra in outlet protectors in place, the Contractor may use precast units that comply with the applicable requirements of Subsection 606. 02(b) for concrete pipe and are furnished from sources listed on the QPL.
c.Granular Filter Material. Granular filter material shall comply with Subsection 403.01 and 403.02 for Class 5 Mineral Aggregate, or Section 802 for coarse aggregate for concrete. Granular filter material shall be crushed stone or crushed gravel. Uncrushed gravel shall not be used. All acceptance sampling and testing will be performed by the Department.
d.Filter Fabric. Filter fabric shall be a nonwoven geotextile complying with Section 625, Type 1.
e.Underdrain Cover. The material used for underdrain cover shall be as specified on the plans.
611.03 Construction Requirements. (a) Pipe Installa tion.
Trenches shall be excavated to the width shown on t he plans. The trench depth shall be as shown on the plans or as e stablished by the Engineer. Pipe of the type selected by the Contractor and of the size specified shall be laid with perforations down and the pipe sections joined securely with the appropriate coupling fitti ngs or bands, or joint filler. The upgrade end of pipe installation s shall be closed with suitable plugs to prevent entry of soil materi als. The pipe shall be installed in such a manner that continuous outfl ow is provided during construction.
b.Underdrain Outlet Protectors. The foundation shall be prepared to the required depth, forms set rigidly t o the line and grade designated, and the concrete placed, spaded, vibrat ed, and finished with a wood float to a true and even surface. When completed, the concrete shall be cured as specified in Section 802 . Precast units shall be placed on a foundation prepa red to the proper depth and the pipe underdrain shall be firml y secured to the outlet protector. The outlet protector shall be placed in such a mann er that the underdrain lateral has a uniform slope to ensure pr oper drainage. 446 Abrupt changes in slope along any portion of the la teral will not be permitted.
c.Granular Filter Material. After the pipe installation has been inspected and approved, granular filter materi al shall be placed and uniformly compacted with mechanical equipment t o a stable condition as directed by the Engineer.
d.Filter Fabric. When required, the filter fabric shall be installed as shown on the plans. Care shall be tak en during the placement of the Granular Filter Material, as well as pipe installation, to prevent damage to the fabric. The Granular Filter Material shall be compacted using a vibratory compa ctor to the satisfaction of the Engineer before making the filt er fabric closure at the top of the trench.
e.Underdrain Cover. When required, underdrain cover shall be placed immediately following the granular filter material. The width and depth of the cover shall be as specified on the plans.
f.Inspection. When included as a pay item in the Contract, the underdrain system that is installed shall be inspec ted by the Contractor. If the planned final surface is asphal t concrete hot mix (ACHM), the inspection shall be performed prior to placement of the final surface course and after placement of the ACH M preceding this course. If the planned final surface is Portland c ement concrete pavement (PCCP), the inspection shall be performed after the base course has been placed and before the PCCP is place d. A video record and written report for each line inspected s hall be furnished to the Engineer. The line identification, distance tr aversed by the camera and pipe deficiency shall be recorded on the videotape and in the written report. Equipment used for inspecting the underdrain system shall satisfy the following minimum requirements:
1.The system shall be capable of providing color vide o inspection of pipelines from 3.5 ″ to 8.0 ″ (88 mm to 200 mm) inside diameter in a wet, corrosive environment and shall be capable of negotiating a 90 ° bend in a 4 ″ (100 mm) or larger diameter, smooth bore or corrugated drainpipe.
2.The system shall be capable of video inspecting up to 300 linear feet (91 m) of laterals and 4 ″ (100mm) pipe 447 underdrains, by push rodding, pull cabling, jetting or tractoring the camera through the line and recordin g the condition.
3.The system shall be equipped with a video monitor c apable of allowing live viewing of the video inspection
4.The system shall be capable of displaying and recor ding the date, line identification, footage and type of pipe deficiency.
5.The system shall be capable of recording the distan ce traversed by the camera to within 0.5 feet (0.15 m) , allowing for overlapping of distances if a reversal is requi red to permit full-length inspection. Any foreign materials that impede the placement or movement of the inspection equipment within the underdrain syst em shall be flushed from the system. Flushing of the underdrai n system shall be required when efforts are needed beyond the normal, as determined by the Engineer, to allow forward progress or to pr event obscured vision of the video inspection equipment. Any underdrain pipe that is damaged or does not con form to the lines and grades shown on the plans shall be replac ed at no cost to the Department. The Contractor shall install the required rodent sc reens promptly after satisfactory video inspection is completed on a section of underdrain.
611.04 Method of Measurement. Pipe Underdrains will be
measured by the linear foot (meter) measured parall el to the flow line of the pipe on a variable depth basis. The me asurement of variable depth required for pipe installation will be made from the finished roadway or ditch elevation as shown on the plans, or from natural ground elevation, whichever is lower, to th e established flowline elevation of the pipe. Underdrain Cover will be measured by the linear foo t (meter). Underdrain Outlet Protectors will be measured by th e unit. Underdrain Video Inspection will be measured by the linear foot (meter) of pipe underdrains and laterals inspected as directed by the Engineer. 448 611.05 Basis of Payment. Work completed and accepted and measured as provided above will be paid for at the contract unit price bid per linear foot (meter) of variable depth for Pipe Underdrains of the size specified; per each for Und erdrain Outlet Protectors; or per linear foot (meter) for Underdra in Cover, which price shall be full compensation for excavation and backfill; for furnishing materials, including necessary fittings, bands, or joint filler; and for all labor, equipment, tools, and in cidentals necessary to complete the work. Granular Filter Material and Filter Fabric will not be paid for separately, but full compensation therefor will be considered included in the contract unit price bid for Pipe Un derdrains. Underdrain inspection completed and accepted and me asured as provided above will be paid for at the contract uni t price bid per linear foot (meter) for Underdrain Video Inspection , which price shall be full compensation for furnishing all video records and written reports; for flushing the completed underdr ain whenever foreign material impedes the movement of the inspec tion equipment or quality of the video; and for all labor, equipme nt tools and incidentals necessary to complete the work. Variable depth installation of pipe underdrains, me asured as provided above, will be paid for at the contract un it price bid plus a percentage as provided in the following schedule: DEPTH OF EXCAVATION RATE From more than To and including 0′ (0 m) 3 ′ (1 m) Contract Price 3′ (1 m) 6 ′ (2 m) Contract price plus 25% Depth greater than 6 ′ (2 m) To be established by Supplemental Agreement 449 Payment will be made under: Pay Item Pay Unit __" (__mm) Pipe Underdrains Linear Foot (Meter) Underdrain Cover Linear Foot (Meter) Underdrain Outlet Protectors Each Underdrain Video Inspection Linear Foot (Meter)
Source: , Edition.