2010 Construction and Material Specifications - Ohio Department of ...
2010 Construction and Material Specifications - Ohio Department of ... 2010 Construction and Material Specifications - Ohio Department of ...
638.06 C. Pipe Clearance. Lay pipe at least 12 inches (300 mm) from any structure or underground utility, and maintain a minimum 10-foot (3 m) horizontal separation from sanitary sewers. D. Existing Systems. Do not operate any valve or other control on the existing system. The maintaining agency will operate all valves, hydrants, air valves, and service stops. E. Pipe Handling. Handle pipe in a manner that will prevent damage to the pipe, pipe lining, or coating. Load, unload, and place pipe and fittings using hoists and slings in a manner that will avoid shock or damage. Do not drop, skid, or roll pipe or fittings against other pipe. F. Pipe Cutting. Whenever it becomes necessary to cut a length of pipe, make the pipe ends square with the longitudinal axis of the pipe and otherwise smooth so that good connections can be made. Cut pipe using cutters recommended by the manufacturer. Do not cut ductile iron pipe with an oxyacetylene torch. File or grind field-cut pipe lengths to obtain a chamfer on the outside of the pipe, according to the manufacturer’s recommendations. Remove rough or sharp edges from the cut end. G. Pipe Laying. Ensure that pipe and fittings are clean when laid. Take precautions to prevent floating. Place the pipe on the trench bottom or bedding. After the pipe has been aligned and jointed, and thrust blocking has been placed, secure the pipe in place with approved backfill material. At times when pipe laying is not in progress, close the open ends of the pipe with a watertight plug. H. Pipe Laying on Curves. If the pipe is shown curved on the plans, construct the curves by special fittings or by deflecting the joints according to the manufacturer’s recommendations. Do not make joint deflections at valves. When rubber-gasketed pipe is laid on a curve, joint the pipe in a straight alignment and then deflect it to the curved alignment. Make trenches wider on curves for this purpose. I. Pipe Laying Where Earth Grading is Necessary. Where a pipe is to be placed within an embankment or the top of the pipe is above the existing ground, construct the embankment to at least 6 inches (150 mm) above the top of the pipe before trenching for the pipe. Excavate the trench to the minimum width necessary for the proper placing and backfilling of the pipe. J. Tracer Tape. Install tracer tape over copper and non-metallic water lines, including service lines. Place the tracer tape approximately 1 foot (0.3 m) above the top of the line and extend the tape for the line’s full length. Use tracer tape that is a detectable type and is marked “WATER.” K. Blocking and Wedging. Lay fire hydrants, valves, and fittings on hardwood blocks and hold them in position by hardwood wedges. Bed blocks firmly in the bottom of the trench with uniform bearing and with the long dimension of the block perpendicular to the pipe barrel. Ensure that the blocks are level across the trench and that the proper number of blocks are placed one upon the other to bring the fittings to the required grade for jointing. 564
565 638.07 L. Thrust Blocking. Furnish plugs, caps, tees, hydrants, and elbows or bends having a deflection of 11 1/4 degrees or greater with concrete thrust blocking, unless suitably restrained joints are provided. Construct the thrust blocking by placing concrete Class C between firm original undisturbed earth and the fitting to be anchored. Place and shape the thrust blocking in a manner satisfactory to the Engineer with the thrust force contained by the blocking. Place the hardwood blocks between the plugs, caps, and hydrants, and the thrust blocking. Place the thrust blocking so that it allows for pipe and joint accessibility or repair. M. Restrained Joints and Fittings. Where conditions at an elbow, tee, or bulkhead are not conducive to the use of thrust blocking, restrain push-on or mechanical joints and fittings by bent or straight tie-rods, straps, clamps, or other devices, with required hardware. Protect the devices against corrosion by the application of an asphalt coating. Restrain mechanical joints by a wedge action type joint restraint with twist-off nuts. If polyethylene encasement is specified, ensure that the encasement covers the entire assembly. The Contractor may use restraining devices instead of thrust blocking when approved by the Engineer. 638.07 Pipe Joints. Furnish ductile iron pipe and cast iron or ductile iron fittings with push-on joints, mechanical joints, boltless-restrained joints, or balland-socket joints. Furnish joints with all accessories and install them according to the manufacturer’s recommendations. During any construction where the outside temperature is below 40 °F (4 °C), keep rubber gaskets and lubricants in a heated area to at least 40 °F (4 °C) until used. Maintain gaskets in a flexible condition until placed in the bell or on the spigot of the pipe. 638.08 Backfilling. Complete backfill from the pipe grade to the finished grade, or to the subgrade surface in paved areas. Furnish and compact backfill material for water mains and appurtenances under pavements in the same manner as for 603 non-plastic Type B conduits. Furnish and compact backfill material for water mains and appurtenances not under pavements in the same manner as for 603 non-plastic Type C conduits. If hydrostatic testing is performed before the backfilling operation is completed, complete the portion of the backfill from pipe grade to the centerline of the pipe, fittings, or appurtenances and place sufficient backfill material over the pipe barrel between joints to prevent movement. Place sand cushions at least 12 inches (0.3 m) thick between the pipe and existing pipelines or other conduits when encountered during construction and as directed by the Engineer. Immediately after completion of the backfilling, restore the site according to Item 603.10. 638.09 Hydrostatic Tests. Apply a hydrostatic test to the whole system or to all individual valved-off sections of the mains where work has been performed. Perform the hydrostatic tests according to of AWWA, except make the test pressure greater than 150 pounds per square inch (1000 kPa). Ensure that the quantity of water lost from the main does not exceed the number of gallons (liters) per hour as determined by in AWWA or by the following formula:
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565<br />
638.07<br />
L. Thrust Blocking. Furnish plugs, caps, tees, hydrants, <strong>and</strong> elbows or bends<br />
having a deflection <strong>of</strong> 11 1/4 degrees or greater with concrete thrust blocking,<br />
unless suitably restrained joints are provided. Construct the thrust blocking by<br />
placing concrete Class C between firm original undisturbed earth <strong>and</strong> the fitting to<br />
be anchored. Place <strong>and</strong> shape the thrust blocking in a manner satisfactory to the<br />
Engineer with the thrust force contained by the blocking. Place the hardwood<br />
blocks between the plugs, caps, <strong>and</strong> hydrants, <strong>and</strong> the thrust blocking. Place the<br />
thrust blocking so that it allows for pipe <strong>and</strong> joint accessibility or repair.<br />
M. Restrained Joints <strong>and</strong> Fittings. Where conditions at an elbow, tee, or<br />
bulkhead are not conducive to the use <strong>of</strong> thrust blocking, restrain push-on or<br />
mechanical joints <strong>and</strong> fittings by bent or straight tie-rods, straps, clamps, or other<br />
devices, with required hardware. Protect the devices against corrosion by the<br />
application <strong>of</strong> an asphalt coating. Restrain mechanical joints by a wedge action<br />
type joint restraint with twist-<strong>of</strong>f nuts. If polyethylene encasement is specified,<br />
ensure that the encasement covers the entire assembly. The Contractor may use<br />
restraining devices instead <strong>of</strong> thrust blocking when approved by the Engineer.<br />
638.07 Pipe Joints. Furnish ductile iron pipe <strong>and</strong> cast iron or ductile iron<br />
fittings with push-on joints, mechanical joints, boltless-restrained joints, or ball<strong>and</strong>-socket<br />
joints. Furnish joints with all accessories <strong>and</strong> install them according to<br />
the manufacturer’s recommendations. During any construction where the outside<br />
temperature is below 40 °F (4 °C), keep rubber gaskets <strong>and</strong> lubricants in a heated<br />
area to at least 40 °F (4 °C) until used. Maintain gaskets in a flexible condition<br />
until placed in the bell or on the spigot <strong>of</strong> the pipe.<br />
638.08 Backfilling. Complete backfill from the pipe grade to the finished<br />
grade, or to the subgrade surface in paved areas. Furnish <strong>and</strong> compact backfill<br />
material for water mains <strong>and</strong> appurtenances under pavements in the same manner<br />
as for 603 non-plastic Type B conduits. Furnish <strong>and</strong> compact backfill material for<br />
water mains <strong>and</strong> appurtenances not under pavements in the same manner as for<br />
603 non-plastic Type C conduits.<br />
If hydrostatic testing is performed before the backfilling operation is completed,<br />
complete the portion <strong>of</strong> the backfill from pipe grade to the centerline <strong>of</strong> the pipe,<br />
fittings, or appurtenances <strong>and</strong> place sufficient backfill material over the pipe barrel<br />
between joints to prevent movement.<br />
Place s<strong>and</strong> cushions at least 12 inches (0.3 m) thick between the pipe <strong>and</strong><br />
existing pipelines or other conduits when encountered during construction <strong>and</strong> as<br />
directed by the Engineer.<br />
Immediately after completion <strong>of</strong> the backfilling, restore the site according to<br />
Item 603.10.<br />
638.09 Hydrostatic Tests. Apply a hydrostatic test to the whole system or to<br />
all individual valved-<strong>of</strong>f sections <strong>of</strong> the mains where work has been performed.<br />
Perform the hydrostatic tests according to <strong>of</strong> AWWA, except make the test<br />
pressure greater than 150 pounds per square inch (1000 kPa). Ensure that the<br />
quantity <strong>of</strong> water lost from the main does not exceed the number <strong>of</strong> gallons (liters)<br />
per hour as determined by in AWWA or by the following formula:
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